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Annotation of Gnu-Mach/i386/i386at/gpl/linux/scsi/53c78xx.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * PERM_OPTIONS are driver options which will be enabled for all NCR boards
        !             3:  * in the system at driver initialization time.
        !             4:  *
        !             5:  * Don't THINK about touching these in PERM_OPTIONS : 
        !             6:  *   OPTION_IO_MAPPED 
        !             7:  *     Memory mapped IO does not work under i86 Linux. 
        !             8:  *
        !             9:  *   OPTION_DEBUG_TEST1
        !            10:  *     Test 1 does bus mastering and interrupt tests, which will help weed 
        !            11:  *     out brain damaged main boards.
        !            12:  *
        !            13:  * These are development kernel changes.  Code for them included in this
        !            14:  * driver release may or may not work.  If you turn them on, you should be 
        !            15:  * running the latest copy of the development sources from
        !            16:  *
        !            17:  *     ftp://tsx-11.mit.edu/pub/linux/ALPHA/scsi/53c7,8xx
        !            18:  *
        !            19:  * and be subscribed to the [email protected] mailing list.  To
        !            20:  * subscribe, send mail to [email protected] with 
        !            21:  *
        !            22:  *     subscribe ncr53c810
        !            23:  * 
        !            24:  * in the text.
        !            25:  *
        !            26:  *
        !            27:  *   OPTION_NOASYNC
        !            28:  *     Don't negotiate for asynchronous transfers on the first command 
        !            29:  *     when OPTION_ALWAYS_SYNCHRONOUS is set.  Useful for dain bramaged
        !            30:  *     devices which do something bad rather than sending a MESSAGE 
        !            31:  *     REJECT back to us like they should if they can't cope.
        !            32:  *
        !            33:  *   OPTION_SYNCHRONOUS
        !            34:  *     Enable support for synchronous transfers.  Target negotiated 
        !            35:  *     synchronous transfers will be responded to.  To initiate 
        !            36:  *     a synchronous transfer request,  call 
        !            37:  *
        !            38:  *         request_synchronous (hostno, target) 
        !            39:  *
        !            40:  *     from within KGDB.
        !            41:  *
        !            42:  *   OPTION_ALWAYS_SYNCHRONOUS
        !            43:  *     Negotiate for synchronous transfers with every target after
        !            44:  *     driver initialization or a SCSI bus reset.  This is a bit dangerous, 
        !            45:  *     since there are some dain bramaged SCSI devices which will accept
        !            46:  *     SDTR messages but keep talking asynchronously.
        !            47:  *
        !            48:  *   OPTION_DISCONNECT
        !            49:  *     Enable support for disconnect/reconnect.  To change the 
        !            50:  *     default setting on a given host adapter, call
        !            51:  *
        !            52:  *         request_disconnect (hostno, allow)
        !            53:  *
        !            54:  *     where allow is non-zero to allow, 0 to disallow.
        !            55:  * 
        !            56:  *  If you really want to run 10MHz FAST SCSI-II transfers, you should 
        !            57:  *  know that the NCR driver currently ignores parity information.  Most
        !            58:  *  systems do 5MHz SCSI fine.  I've seen a lot that have problems faster
        !            59:  *  than 8MHz.  To play it safe, we only request 5MHz transfers.
        !            60:  *
        !            61:  *  If you'd rather get 10MHz transfers, edit sdtr_message and change 
        !            62:  *  the fourth byte from 50 to 25.
        !            63:  */
        !            64: 
        !            65: #define PERM_OPTIONS (OPTION_IO_MAPPED|OPTION_DEBUG_TEST1|OPTION_DISCONNECT|\
        !            66:        OPTION_SYNCHRONOUS)
        !            67: 
        !            68: /*
        !            69:  * Sponsored by 
        !            70:  *     iX Multiuser Multitasking Magazine
        !            71:  *     Hannover, Germany
        !            72:  *     [email protected]
        !            73:  *
        !            74:  * Copyright 1993, 1994, 1995 Drew Eckhardt
        !            75:  *      Visionary Computing 
        !            76:  *      (Unix and Linux consulting and custom programming)
        !            77:  *      [email protected]
        !            78:  *     +1 (303) 786-7975
        !            79:  *
        !            80:  * TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
        !            81:  * 
        !            82:  * For more information, please consult 
        !            83:  *
        !            84:  * NCR53C810 
        !            85:  * SCSI I/O Processor
        !            86:  * Programmer's Guide
        !            87:  *
        !            88:  * NCR 53C810
        !            89:  * PCI-SCSI I/O Processor
        !            90:  * Data Manual
        !            91:  *
        !            92:  * NCR 53C810/53C820
        !            93:  * PCI-SCSI I/O Processor Design In Guide
        !            94:  *
        !            95:  * For literature on Symbios Logic Inc. formerly NCR, SCSI, 
        !            96:  * and Communication products please call (800) 334-5454 or
        !            97:  * (719) 536-3300. 
        !            98:  * 
        !            99:  * PCI BIOS Specification Revision
        !           100:  * PCI Local Bus Specification
        !           101:  * PCI System Design Guide
        !           102:  *
        !           103:  * PCI Special Interest Group
        !           104:  * M/S HF3-15A
        !           105:  * 5200 N.E. Elam Young Parkway
        !           106:  * Hillsboro, Oregon 97124-6497
        !           107:  * +1 (503) 696-2000 
        !           108:  * +1 (800) 433-5177
        !           109:  */
        !           110: 
        !           111: /*
        !           112:  * Design issues : 
        !           113:  * The cumulative latency needed to propagate a read/write request 
        !           114:  * through the file system, buffer cache, driver stacks, SCSI host, and 
        !           115:  * SCSI device is ultimately the limiting factor in throughput once we 
        !           116:  * have a sufficiently fast host adapter.
        !           117:  *  
        !           118:  * So, to maximize performance we want to keep the ratio of latency to data 
        !           119:  * transfer time to a minimum by
        !           120:  * 1.  Minimizing the total number of commands sent (typical command latency
        !           121:  *     including drive and bus mastering host overhead is as high as 4.5ms)
        !           122:  *     to transfer a given amount of data.  
        !           123:  *
        !           124:  *      This is accomplished by placing no arbitrary limit on the number
        !           125:  *     of scatter/gather buffers supported, since we can transfer 1K
        !           126:  *     per scatter/gather buffer without Eric's cluster patches, 
        !           127:  *     4K with.  
        !           128:  *
        !           129:  * 2.  Minimizing the number of fatal interrupts serviced, since
        !           130:  *     fatal interrupts halt the SCSI I/O processor.  Basically,
        !           131:  *     this means offloading the practical maximum amount of processing 
        !           132:  *     to the SCSI chip.
        !           133:  * 
        !           134:  *     On the NCR53c810/820/720,  this is accomplished by using 
        !           135:  *             interrupt-on-the-fly signals when commands complete, 
        !           136:  *             and only handling fatal errors and SDTR / WDTR  messages 
        !           137:  *             in the host code.
        !           138:  *
        !           139:  *     On the NCR53c710, interrupts are generated as on the NCR53c8x0,
        !           140:  *             only the lack of a interrupt-on-the-fly facility complicates
        !           141:  *             things.   Also, SCSI ID registers and commands are 
        !           142:  *             bit fielded rather than binary encoded.
        !           143:  *             
        !           144:  *     On the NCR53c700 and NCR53c700-66, operations that are done via 
        !           145:  *             indirect, table mode on the more advanced chips must be
        !           146:  *             replaced by calls through a jump table which 
        !           147:  *             acts as a surrogate for the DSA.  Unfortunately, this 
        !           148:  *             will mean that we must service an interrupt for each 
        !           149:  *             disconnect/reconnect.
        !           150:  * 
        !           151:  * 3.  Eliminating latency by pipelining operations at the different levels.
        !           152:  *     
        !           153:  *     This driver allows a configurable number of commands to be enqueued
        !           154:  *     for each target/lun combination (experimentally, I have discovered
        !           155:  *     that two seems to work best) and will ultimately allow for 
        !           156:  *     SCSI-II tagged queuing.
        !           157:  *     
        !           158:  *
        !           159:  * Architecture : 
        !           160:  * This driver is built around a Linux queue of commands waiting to 
        !           161:  * be executed, and a shared Linux/NCR array of commands to start.  Commands
        !           162:  * are transfered to the array  by the run_process_issue_queue() function 
        !           163:  * which is called whenever a command completes.
        !           164:  *
        !           165:  * As commands are completed, the interrupt routine is triggered,
        !           166:  * looks for commands in the linked list of completed commands with
        !           167:  * valid status, removes these commands from a list of running commands, 
        !           168:  * calls the done routine, and flags their target/luns as not busy.
        !           169:  *
        !           170:  * Due to limitations in the intelligence of the NCR chips, certain
        !           171:  * concessions are made.  In many cases, it is easier to dynamically 
        !           172:  * generate/fix-up code rather than calculate on the NCR at run time.  
        !           173:  * So, code is generated or fixed up for
        !           174:  *
        !           175:  * - Handling data transfers, using a variable number of MOVE instructions
        !           176:  *     interspersed with CALL MSG_IN, WHEN MSGIN instructions.
        !           177:  *
        !           178:  *     The DATAIN and DATAOUT routines are separate, so that an incorrect
        !           179:  *     direction can be trapped, and space isn't wasted. 
        !           180:  *
        !           181:  *     It may turn out that we're better off using some sort 
        !           182:  *     of table indirect instruction in a loop with a variable
        !           183:  *     sized table on the NCR53c710 and newer chips.
        !           184:  *
        !           185:  * - Checking for reselection (NCR53c710 and better)
        !           186:  *
        !           187:  * - Handling the details of SCSI context switches (NCR53c710 and better),
        !           188:  *     such as reprogramming appropriate synchronous parameters, 
        !           189:  *     removing the dsa structure from the NCR's queue of outstanding
        !           190:  *     commands, etc.
        !           191:  *
        !           192:  */
        !           193: 
        !           194: /* 
        !           195:  * Accommodate differences between stock 1.2.x and 1.3.x asm-i386/types.h
        !           196:  * so lusers can drop in 53c7,8xx.* and get something which compiles 
        !           197:  * without warnings.
        !           198:  */
        !           199: 
        !           200: #if !defined(LINUX_1_2) && !defined(LINUX_1_3)
        !           201: #include <linux/version.h>
        !           202: #if LINUX_VERSION_CODE > 65536 + 3 * 256
        !           203: #define LINUX_1_3
        !           204: #else
        !           205: #define LINUX_1_2
        !           206: #endif
        !           207: #endif
        !           208: 
        !           209: #ifdef LINUX_1_2
        !           210: #define u32 bogus_u32
        !           211: #define s32 bogus_s32
        !           212: #include <asm/types.h>
        !           213: #undef u32
        !           214: #undef s32
        !           215: typedef __signed__ int s32;
        !           216: typedef unsigned int  u32;
        !           217: #endif /* def LINUX_1_2 */
        !           218: 
        !           219: #ifdef MODULE
        !           220: #include <linux/module.h>
        !           221: #endif
        !           222: 
        !           223: #include <asm/dma.h>
        !           224: #include <asm/io.h>
        !           225: #include <asm/system.h>
        !           226: #include <linux/delay.h>
        !           227: #include <linux/signal.h>
        !           228: #include <linux/sched.h>
        !           229: #include <linux/errno.h>
        !           230: #include <linux/bios32.h>
        !           231: #include <linux/pci.h>
        !           232: #include <linux/proc_fs.h>
        !           233: #include <linux/string.h>
        !           234: #include <linux/malloc.h>
        !           235: #include <linux/mm.h>
        !           236: #include <linux/ioport.h>
        !           237: #include <linux/time.h>
        !           238: #ifdef LINUX_1_2
        !           239: #include "../block/blk.h"
        !           240: #else
        !           241: #include <linux/blk.h>
        !           242: #endif
        !           243: #undef current
        !           244: 
        !           245: #include "scsi.h"
        !           246: #include "hosts.h"
        !           247: #include "53c7,8xx.h"
        !           248: #include "constants.h"
        !           249: #include "sd.h"
        !           250: #include <linux/stat.h>
        !           251: #include <linux/stddef.h>
        !           252: 
        !           253: #ifndef LINUX_1_2
        !           254: struct proc_dir_entry proc_scsi_ncr53c7xx = {
        !           255:     PROC_SCSI_NCR53C7xx, 9, "ncr53c7xx",
        !           256:     S_IFDIR | S_IRUGO | S_IXUGO, 2
        !           257: };
        !           258: #endif
        !           259: 
        !           260: static int check_address (unsigned long addr, int size);
        !           261: static void dump_events (struct Scsi_Host *host, int count);
        !           262: static Scsi_Cmnd * return_outstanding_commands (struct Scsi_Host *host, 
        !           263:     int free, int issue);
        !           264: static void hard_reset (struct Scsi_Host *host);
        !           265: static void ncr_scsi_reset (struct Scsi_Host *host);
        !           266: static void print_lots (struct Scsi_Host *host);
        !           267: static void set_synchronous (struct Scsi_Host *host, int target, int sxfer, 
        !           268:     int scntl3, int now_connected);
        !           269: static int datapath_residual (struct Scsi_Host *host);
        !           270: static const char * sbcl_to_phase (int sbcl);
        !           271: static void print_progress (Scsi_Cmnd *cmd);
        !           272: static void print_queues (struct Scsi_Host *host);
        !           273: static void process_issue_queue (unsigned long flags);
        !           274: static int shutdown (struct Scsi_Host *host);
        !           275: static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int result);
        !           276: static int disable (struct Scsi_Host *host);
        !           277: static int NCR53c8xx_run_tests (struct Scsi_Host *host);
        !           278: static int NCR53c8xx_script_len;
        !           279: static int NCR53c8xx_dsa_len;
        !           280: static void NCR53c7x0_intr(int irq, struct pt_regs * regs);
        !           281: static int ncr_halt (struct Scsi_Host *host);
        !           282: static void intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd 
        !           283:     *cmd);
        !           284: static void intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd);
        !           285: static void print_dsa (struct Scsi_Host *host, u32 *dsa,
        !           286:     const char *prefix);
        !           287: static int print_insn (struct Scsi_Host *host, const u32 *insn,
        !           288:     const char *prefix, int kernel);
        !           289: 
        !           290: static void NCR53c8xx_dsa_fixup (struct NCR53c7x0_cmd *cmd);
        !           291: static void NCR53c8x0_init_fixup (struct Scsi_Host *host);
        !           292: static int NCR53c8x0_dstat_sir_intr (struct Scsi_Host *host, struct 
        !           293:     NCR53c7x0_cmd *cmd);
        !           294: static void NCR53c8x0_soft_reset (struct Scsi_Host *host);
        !           295: 
        !           296: /* INSMOD variables */
        !           297: static long long perm_options = PERM_OPTIONS;
        !           298: /* 14 = .5s; 15 is max; decreasing divides by two. */
        !           299: static int selection_timeout = 14;
        !           300: /* Size of event list (per host adapter) */
        !           301: static int track_events = 0;
        !           302: 
        !           303: static struct Scsi_Host *first_host = NULL;    /* Head of list of NCR boards */
        !           304: static Scsi_Host_Template *the_template = NULL;        
        !           305: 
        !           306: /*
        !           307:  * KNOWN BUGS :
        !           308:  * - There is some sort of conflict when the PPP driver is compiled with 
        !           309:  *     support for 16 channels?
        !           310:  * 
        !           311:  * - On systems which predate the 1.3.x initialization order change,
        !           312:  *      the NCR driver will cause Cannot get free page messages to appear.  
        !           313:  *      These are harmless, but I don't know of an easy way to avoid them.
        !           314:  *
        !           315:  * - With OPTION_DISCONNECT, on two systems under unknown circumstances,
        !           316:  *     we get a PHASE MISMATCH with DSA set to zero (suggests that we 
        !           317:  *     are occurring somewhere in the reselection code) where 
        !           318:  *     DSP=some value DCMD|DBC=same value.  
        !           319:  *     
        !           320:  *     Closer inspection suggests that we may be trying to execute
        !           321:  *     some portion of the DSA?
        !           322:  * scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
        !           323:  * scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
        !           324:  * scsi0 : no current command : unexpected phase MSGIN.
        !           325:  *         DSP=0x1c46cc, DCMD|DBC=0x1c46ac, DSA=0x0
        !           326:  *         DSPS=0x0, TEMP=0x1c3e70, DMODE=0x80
        !           327:  * scsi0 : DSP->
        !           328:  * 001c46cc : 0x001c46cc 0x00000000
        !           329:  * 001c46d4 : 0x001c5ea0 0x000011f8
        !           330:  *
        !           331:  *     Changed the print code in the phase_mismatch handler so
        !           332:  *     that we call print_lots to try and diagnose this.
        !           333:  *
        !           334:  */
        !           335: 
        !           336: /* 
        !           337:  * Possible future direction of architecture for max performance :
        !           338:  *
        !           339:  * We're using a single start array for the NCR chip.  This is 
        !           340:  * sub-optimal, because we cannot add a command which would conflict with 
        !           341:  * an executing command to this start queue, and therefore must insert the 
        !           342:  * next command for a given I/T/L combination after the first has completed;
        !           343:  * incurring our interrupt latency between SCSI commands.
        !           344:  *
        !           345:  * To allow furthur pipelining of the NCR and host CPU operation, we want 
        !           346:  * to set things up so that immediately on termination of a command destined 
        !           347:  * for a given LUN, we get that LUN busy again.  
        !           348:  * 
        !           349:  * To do this, we need to add a 32 bit pointer to which is jumped to 
        !           350:  * on completion of a command.  If no new command is available, this 
        !           351:  * would point to the usual DSA issue queue select routine.
        !           352:  *
        !           353:  * If one were, it would point to a per-NCR53c7x0_cmd select routine 
        !           354:  * which starts execution immediately, inserting the command at the head 
        !           355:  * of the start queue if the NCR chip is selected or reselected.
        !           356:  *
        !           357:  * We would chanage so that we keep a list of outstanding commands 
        !           358:  * for each unit, rather than a single running_list.  We'd insert 
        !           359:  * a new command into the right running list; if the NCR didn't 
        !           360:  * have something running for that yet, we'd put it in the 
        !           361:  * start queue as well.  Some magic needs to happen to handle the 
        !           362:  * race condition between the first command terminating before the 
        !           363:  * new one is written.
        !           364:  *
        !           365:  * Potential for profiling : 
        !           366:  * Call do_gettimeofday(struct timeval *tv) to get 800ns resolution.
        !           367:  */
        !           368: 
        !           369: 
        !           370: /*
        !           371:  * TODO : 
        !           372:  * 1.  To support WIDE transfers, not much needs to happen.  We
        !           373:  *     should do CHMOVE instructions instead of MOVEs when
        !           374:  *     we have scatter/gather segments of uneven length.  When
        !           375:  *     we do this, we need to handle the case where we disconnect
        !           376:  *     between segments.
        !           377:  * 
        !           378:  * 2.  Currently, when Icky things happen we do a FATAL().  Instead,
        !           379:  *     we want to do an integrity check on the parts of the NCR hostdata
        !           380:  *     structure which were initialized at boot time; FATAL() if that 
        !           381:  *     fails, and otherwise try to recover.  Keep track of how many
        !           382:  *     times this has happened within a single SCSI command; if it 
        !           383:  *     gets excessive, then FATAL().
        !           384:  *
        !           385:  * 3.  Parity checking is currently disabled, and a few things should 
        !           386:  *     happen here now that we support synchronous SCSI transfers :
        !           387:  *     1.  On soft-reset, we shuld set the EPC (Enable Parity Checking)
        !           388:  *        and AAP (Assert SATN/ on parity error) bits in SCNTL0.
        !           389:  *     
        !           390:  *     2.  We should enable the parity interrupt in the SIEN0 register.
        !           391:  * 
        !           392:  *     3.  intr_phase_mismatch() needs to believe that message out is 
        !           393:  *        allways an "acceptable" phase to have a mismatch in.  If 
        !           394:  *        the old phase was MSG_IN, we should send a MESSAGE PARITY 
        !           395:  *        error.  If the old phase was something else, we should send
        !           396:  *        a INITIATOR_DETECTED_ERROR message.  Note that this could
        !           397:  *        cause a RESTORE POINTERS message; so we should handle that 
        !           398:  *        correctly first.  Instead, we should probably do an 
        !           399:  *        initiator_abort.
        !           400:  *
        !           401:  * 4.  MPEE bit of CTEST4 should be set so we get interrupted if 
        !           402:  *     we detect an error.
        !           403:  *
        !           404:  *  
        !           405:  * 5.  The initial code has been tested on the NCR53c810.  I don't 
        !           406:  *     have access to NCR53c700, 700-66 (Forex boards), NCR53c710
        !           407:  *     (NCR Pentium systems), NCR53c720, NCR53c820, or NCR53c825 boards to 
        !           408:  *     finish development on those platforms.
        !           409:  *
        !           410:  *     NCR53c820/825/720 - need to add wide transfer support, including WDTR 
        !           411:  *                     negotiation, programming of wide transfer capabilities
        !           412:  *             on reselection and table indirect selection.
        !           413:  *
        !           414:  *     NCR53c710 - need to add fatal interrupt or GEN code for 
        !           415:  *             command completion signaling.   Need to modify all 
        !           416:  *             SDID, SCID, etc. registers, and table indirect select code 
        !           417:  *             since these use bit fielded (ie 1<<target) instead of 
        !           418:  *             binary encoded target ids.  Need to accomodate
        !           419:  *             different register mappings, probably scan through
        !           420:  *             the SCRIPT code and change the non SFBR register operand
        !           421:  *             of all MOVE instructions.
        !           422:  * 
        !           423:  *     NCR53c700/700-66 - need to add code to refix addresses on 
        !           424:  *             every nexus change, eliminate all table indirect code,
        !           425:  *             very messy.
        !           426:  *
        !           427:  * 6.  The NCR53c7x0 series is very popular on other platforms that 
        !           428:  *     could be running Linux - ie, some high performance AMIGA SCSI 
        !           429:  *     boards use it.  
        !           430:  *     
        !           431:  *     So, I should include #ifdef'd code so that it is 
        !           432:  *     compatible with these systems.
        !           433:  *     
        !           434:  *     Specifically, the little Endian assumptions I made in my 
        !           435:  *     bit fields need to change, and if the NCR doesn't see memory
        !           436:  *     the right way, we need to provide options to reverse words
        !           437:  *     when the scripts are relocated.
        !           438:  *
        !           439:  * 7.  Use vremap() to access memory mapped boards.  
        !           440:  */
        !           441: 
        !           442: /* 
        !           443:  * Allow for simultaneous existence of multiple SCSI scripts so we 
        !           444:  * can have a single driver binary for all of the family.
        !           445:  *
        !           446:  * - one for NCR53c700 and NCR53c700-66 chips  (not yet supported)
        !           447:  * - one for rest (only the NCR53c810, 815, 820, and 825 are currently 
        !           448:  *     supported)
        !           449:  * 
        !           450:  * So that we only need two SCSI scripts, we need to modify things so
        !           451:  * that we fixup register accesses in READ/WRITE instructions, and 
        !           452:  * we'll also have to accomodate the bit vs. binary encoding of IDs
        !           453:  * with the 7xx chips.
        !           454:  */
        !           455: 
        !           456: /*
        !           457:  * Use pci_chips_ids to translate in both directions between PCI device ID 
        !           458:  * and chip numbers.  
        !           459:  */
        !           460: 
        !           461: static struct {
        !           462:     unsigned short pci_device_id;
        !           463:     int chip;
        !           464: /* 
        !           465:  * The revision field of the PCI_CLASS_REVISION register is compared 
        !           466:  * against each of these fields if the field is not -1.  If it
        !           467:  * is less than min_revision or larger than max_revision, a warning
        !           468:  * message is printed.
        !           469:  */
        !           470:     int max_revision;
        !           471:     int min_revision;
        !           472: } pci_chip_ids[] = { 
        !           473:     {PCI_DEVICE_ID_NCR_53C810, 810, 2, 1}, 
        !           474:     {PCI_DEVICE_ID_NCR_53C815, 815, 3, 2},
        !           475:     {PCI_DEVICE_ID_NCR_53C820, 820, -1, -1},
        !           476:     {PCI_DEVICE_ID_NCR_53C825, 825, -1, -1}
        !           477: };
        !           478: 
        !           479: #define NPCI_CHIP_IDS (sizeof (pci_chip_ids) / sizeof(pci_chip_ids[0]))
        !           480: 
        !           481: #define ROUNDUP(adr,type)      \
        !           482:   ((void *) (((long) (adr) + sizeof(type) - 1) & ~(sizeof(type) - 1)))
        !           483: 
        !           484: /* 
        !           485:  * Forced detection and autoprobe code for various hardware.  Currently, 
        !           486:  * entry points for these are not included in init/main.c because if the 
        !           487:  * PCI BIOS code isn't working right, you're not going to be able to use 
        !           488:  * the hardware anyways; this way we force users to solve their 
        !           489:  * problems rather than forcing detection and blaming us when it 
        !           490:  * does not work.
        !           491:  */
        !           492: 
        !           493: static struct override {
        !           494:     int chip;  /* 700, 70066, 710, 720, 810, 820 */
        !           495:     int board; /* Any special board level gunk */
        !           496:     unsigned pci:1;
        !           497:     union {
        !           498:        struct {
        !           499:            int base;   /* Memory address - indicates memory mapped regs */
        !           500:            int io_port;/* I/O port address - indicates I/O mapped regs */
        !           501:            int irq;    /* IRQ line */          
        !           502:            int dma;    /* DMA channel          - often none */
        !           503:        } normal;
        !           504:        struct {
        !           505:            int bus;
        !           506:            int device;
        !           507:            int function;
        !           508:        } pci;
        !           509:     } data;
        !           510:     long long options;
        !           511: } overrides [4] = {{0,},};
        !           512: static int commandline_current = 0;
        !           513: static int no_overrides = 0;
        !           514: 
        !           515: #if 0
        !           516: #define OVERRIDE_LIMIT (sizeof(overrides) / sizeof(struct override))
        !           517: #else
        !           518: #define OVERRIDE_LIMIT commandline_current
        !           519: #endif
        !           520: 
        !           521: /*
        !           522:  * Function: issue_to_cmd
        !           523:  *
        !           524:  * Purpose: convert jump instruction in issue array to NCR53c7x0_cmd
        !           525:  *     structure pointer.  
        !           526:  *
        !           527:  * Inputs; issue - pointer to start of NOP or JUMP instruction
        !           528:  *     in issue array.
        !           529:  *
        !           530:  * Returns: pointer to command on success; 0 if opcode is NOP.
        !           531:  */
        !           532: 
        !           533: static inline struct NCR53c7x0_cmd *
        !           534: issue_to_cmd (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
        !           535:     u32 *issue)
        !           536: {
        !           537:     return (issue[0] != hostdata->NOP_insn) ? 
        !           538:     /* 
        !           539:      * If the IF TRUE bit is set, it's a JUMP instruction.  The
        !           540:      * operand is a bus pointer to the dsa_begin routine for this DSA.  The
        !           541:      * dsa field of the NCR53c7x0_cmd structure starts with the 
        !           542:      * DSA code template.  By converting to a virtual address,
        !           543:      * subtracting the code template size, and offset of the 
        !           544:      * dsa field, we end up with a pointer to the start of the 
        !           545:      * structure (alternatively, we could use the 
        !           546:      * dsa_cmnd field, an anachronism from when we weren't
        !           547:      * sure what the relationship between the NCR structures
        !           548:      * and host structures were going to be.
        !           549:      */
        !           550:        (struct NCR53c7x0_cmd *) ((char *) bus_to_virt (issue[1]) - 
        !           551:            (hostdata->E_dsa_code_begin - hostdata->E_dsa_code_template) -
        !           552:            offsetof(struct NCR53c7x0_cmd, dsa)) 
        !           553:     /* If the IF TRUE bit is not set, it's a NOP */
        !           554:        : NULL;
        !           555: }
        !           556: 
        !           557: 
        !           558: /*
        !           559:  * Function : static internal_setup(int board, int chip, char *str, int *ints)
        !           560:  *
        !           561:  * Purpose : LILO command line initialization of the overrides array,
        !           562:  * 
        !           563:  * Inputs : board - currently, unsupported.  chip - 700, 70066, 710, 720
        !           564:  *     810, 815, 820, 825, although currently only the NCR53c810 is 
        !           565:  *     supported.
        !           566:  * 
        !           567:  */
        !           568: 
        !           569: static void 
        !           570: internal_setup(int board, int chip, char *str, int *ints) {
        !           571:     unsigned char pci;         /* Specifies a PCI override, with bus, device,
        !           572:                                   function */
        !           573: 
        !           574:     pci = (str && !strcmp (str, "pci")) ? 1 : 0;
        !           575:     
        !           576: /*
        !           577:  * Override syntaxes are as follows : 
        !           578:  * ncr53c700,ncr53c700-66,ncr53c710,ncr53c720=mem,io,irq,dma
        !           579:  * ncr53c810,ncr53c820,ncr53c825=mem,io,irq or pci,bus,device,function
        !           580:  */
        !           581: 
        !           582:     if (commandline_current < OVERRIDE_LIMIT) {
        !           583:        overrides[commandline_current].pci = pci ? 1 : 0;
        !           584:        if (!pci) {
        !           585:            overrides[commandline_current].data.normal.base = ints[1];
        !           586:            overrides[commandline_current].data.normal.io_port = ints[2];
        !           587:            overrides[commandline_current].data.normal.irq = ints[3];
        !           588:            overrides[commandline_current].data.normal.dma = (ints[0] >= 4) ?
        !           589:                ints[4] : DMA_NONE;
        !           590:            /* FIXME: options is now a long long */
        !           591:            overrides[commandline_current].options = (ints[0] >= 5) ?
        !           592:                ints[5] : 0;
        !           593:        } else {
        !           594:            overrides[commandline_current].data.pci.bus = ints[1];
        !           595:            overrides[commandline_current].data.pci.device = ints[2];
        !           596:            overrides[commandline_current].data.pci.function = ints[3];
        !           597:            /* FIXME: options is now a long long */
        !           598:            overrides[commandline_current].options = (ints[0] >= 4) ?
        !           599:                ints[4] : 0;
        !           600:        }
        !           601:        overrides[commandline_current].board = board;
        !           602:        overrides[commandline_current].chip = chip;
        !           603:        ++commandline_current;
        !           604:        ++no_overrides;
        !           605:     } else {
        !           606:        printk ("53c7,7x0.c:internal_setup() : too many overrides\n");
        !           607:     }
        !           608: }
        !           609: 
        !           610: /*
        !           611:  * XXX - we might want to implement a single override function
        !           612:  *       with a chip type field, revamp the command line configuration,
        !           613:  *      etc.
        !           614:  */
        !           615: 
        !           616: #define setup_wrapper(x)                               \
        !           617: void ncr53c##x##_setup (char *str, int *ints) {                \
        !           618:     internal_setup (BOARD_GENERIC, x, str, ints);      \
        !           619: }
        !           620: 
        !           621: setup_wrapper(700)
        !           622: setup_wrapper(70066)
        !           623: setup_wrapper(710)
        !           624: setup_wrapper(720)
        !           625: setup_wrapper(810)
        !           626: setup_wrapper(815)
        !           627: setup_wrapper(820)
        !           628: setup_wrapper(825)
        !           629: 
        !           630: /* 
        !           631:  * FIXME: we should junk these, in favor of synchronous_want and 
        !           632:  * wide_want in the NCR53c7x0_hostdata structure.
        !           633:  */
        !           634: 
        !           635: /* Template for "preferred" synchronous transfer parameters. */
        !           636: 
        !           637: static const unsigned char sdtr_message[] = {
        !           638:     EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 50 /* *4ns */, 8 /* off */ 
        !           639: };
        !           640: 
        !           641: /* Template to request asynchronous transfers */
        !           642: 
        !           643: static const unsigned char async_message[] = {
        !           644:     EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 0, 0 /* asynchronous */
        !           645: };
        !           646: 
        !           647: /* Template for "preferred" WIDE transfer parameters */
        !           648: 
        !           649: static const unsigned char wdtr_message[] = {
        !           650:     EXTENDED_MESSAGE, 2 /* length */, EXTENDED_WDTR, 1 /* 2^1 bytes */
        !           651: };
        !           652: 
        !           653: /*
        !           654:  * Function : struct Scsi_Host *find_host (int host)
        !           655:  * 
        !           656:  * Purpose : KGDB support function which translates a host number 
        !           657:  *     to a host structure. 
        !           658:  *
        !           659:  * Inputs : host - number of SCSI host
        !           660:  *
        !           661:  * Returns : NULL on failure, pointer to host structure on success.
        !           662:  */
        !           663: 
        !           664: static struct Scsi_Host *
        !           665: find_host (int host) {
        !           666:     struct Scsi_Host *h;
        !           667:     for (h = first_host; h && h->host_no != host; h = h->next);
        !           668:     if (!h) {
        !           669:        printk (KERN_ALERT "scsi%d not found\n", host);
        !           670:        return NULL;
        !           671:     } else if (h->hostt != the_template) {
        !           672:        printk (KERN_ALERT "scsi%d is not a NCR board\n", host);
        !           673:        return NULL;
        !           674:     }
        !           675:     return h;
        !           676: }
        !           677: 
        !           678: /*
        !           679:  * Function : request_synchronous (int host, int target)
        !           680:  * 
        !           681:  * Purpose : KGDB interface which will allow us to negotiate for 
        !           682:  *     synchronous transfers.  This ill be replaced with a more 
        !           683:  *     integrated function; perhaps a new entry in the scsi_host 
        !           684:  *     structure, accessable via an ioctl() or perhaps /proc/scsi.
        !           685:  *
        !           686:  * Inputs : host - number of SCSI host; target - number of target.
        !           687:  *
        !           688:  * Returns : 0 when negotiation has been setup for next SCSI command,
        !           689:  *     -1 on failure.
        !           690:  */
        !           691: 
        !           692: static int
        !           693: request_synchronous (int host, int target) {
        !           694:     struct Scsi_Host *h;
        !           695:     struct NCR53c7x0_hostdata *hostdata;
        !           696:     unsigned long flags;
        !           697:     if (target < 0) {
        !           698:        printk (KERN_ALERT "target %d is bogus\n", target);
        !           699:        return -1;
        !           700:     }
        !           701:     if (!(h = find_host (host)))
        !           702:        return -1;
        !           703:     else if (h->this_id == target) {
        !           704:        printk (KERN_ALERT "target %d is host ID\n", target);
        !           705:        return -1;
        !           706:     } 
        !           707: #ifndef LINUX_1_2
        !           708:     else if (target > h->max_id) {
        !           709:        printk (KERN_ALERT "target %d exceeds maximum of %d\n", target,
        !           710:            h->max_id);
        !           711:        return -1;
        !           712:     }
        !           713: #endif
        !           714:     hostdata = (struct NCR53c7x0_hostdata *)h->hostdata;
        !           715: 
        !           716:     save_flags(flags);
        !           717:     cli();
        !           718:     if (hostdata->initiate_sdtr & (1 << target)) {
        !           719:        restore_flags(flags);
        !           720:        printk (KERN_ALERT "target %d allready doing SDTR\n", target);
        !           721:        return -1;
        !           722:     } 
        !           723:     hostdata->initiate_sdtr |= (1 << target);
        !           724:     restore_flags(flags);
        !           725:     return 0;
        !           726: }
        !           727: 
        !           728: /*
        !           729:  * Function : request_disconnect (int host, int on_or_off)
        !           730:  * 
        !           731:  * Purpose : KGDB support function, tells us to allow or disallow 
        !           732:  *     disconnections.
        !           733:  *
        !           734:  * Inputs : host - number of SCSI host; on_or_off - non-zero to allow,
        !           735:  *     zero to disallow.
        !           736:  *
        !           737:  * Returns : 0 on success, *   -1 on failure.
        !           738:  */
        !           739: 
        !           740: static int 
        !           741: request_disconnect (int host, int on_or_off) {
        !           742:     struct Scsi_Host *h;
        !           743:     struct NCR53c7x0_hostdata *hostdata;
        !           744:     if (!(h = find_host (host)))
        !           745:        return -1;
        !           746:     hostdata = (struct NCR53c7x0_hostdata *) h->hostdata;
        !           747:     if (on_or_off) 
        !           748:        hostdata->options |= OPTION_DISCONNECT;
        !           749:     else
        !           750:        hostdata->options &= ~OPTION_DISCONNECT;
        !           751:     return 0;
        !           752: }
        !           753: 
        !           754: /*
        !           755:  * Function : static void NCR53c7x0_driver_init (struct Scsi_Host *host)
        !           756:  *
        !           757:  * Purpose : Initialize internal structures, as required on startup, or 
        !           758:  *     after a SCSI bus reset.
        !           759:  * 
        !           760:  * Inputs : host - pointer to this host adapter's structure
        !           761:  */
        !           762: 
        !           763: static void 
        !           764: NCR53c7x0_driver_init (struct Scsi_Host *host) {
        !           765:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !           766:        host->hostdata;
        !           767:     int i, j;
        !           768:     u32 *current;
        !           769:     for (i = 0; i < 16; ++i) {
        !           770:        hostdata->request_sense[i] = 0;
        !           771:        for (j = 0; j < 8; ++j) 
        !           772:            hostdata->busy[i][j] = 0;
        !           773:        set_synchronous (host, i, /* sxfer */ 0, hostdata->saved_scntl3, 0);
        !           774:     }
        !           775:     hostdata->issue_queue = NULL;
        !           776:     hostdata->running_list = hostdata->finished_queue = 
        !           777:        hostdata->current = NULL;
        !           778:     for (i = 0, current = (u32 *) hostdata->schedule; 
        !           779:        i < host->can_queue; ++i, current += 2) {
        !           780:        current[0] = hostdata->NOP_insn;
        !           781:        current[1] = 0xdeadbeef;
        !           782:     }
        !           783:     current[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) | DBC_TCI_TRUE;
        !           784:     current[1] = (u32) virt_to_bus (hostdata->script) +
        !           785:        hostdata->E_wait_reselect;
        !           786:     hostdata->reconnect_dsa_head = 0;
        !           787:     hostdata->addr_reconnect_dsa_head = (u32) 
        !           788:        virt_to_bus((void *) &(hostdata->reconnect_dsa_head));
        !           789:     hostdata->expecting_iid = 0;
        !           790:     hostdata->expecting_sto = 0;
        !           791:     if (hostdata->options & OPTION_ALWAYS_SYNCHRONOUS) 
        !           792:        hostdata->initiate_sdtr = 0xffff; 
        !           793:     else
        !           794:        hostdata->initiate_sdtr = 0;
        !           795:     hostdata->talked_to = 0;
        !           796:     hostdata->idle = 1;
        !           797: }
        !           798: 
        !           799: /* 
        !           800:  * Function : static int ccf_to_clock (int ccf)
        !           801:  *
        !           802:  * Purpose :  Return the largest SCSI clock allowable for a given
        !           803:  *     clock conversion factor, allowing us to do synchronous periods
        !           804:  *     when we don't know what the SCSI clock is by taking at least 
        !           805:  *     as long as the device says we can.
        !           806:  *
        !           807:  * Inputs : ccf
        !           808:  *
        !           809:  * Returns : clock on success, -1 on failure.
        !           810:  */
        !           811: 
        !           812: static int 
        !           813: ccf_to_clock (int ccf) {
        !           814:     switch (ccf) {
        !           815:     case 1: return 25000000;   /* Divide by 1.0 */
        !           816:     case 2: return 37500000;   /* Divide by 1.5 */
        !           817:     case 3: return 50000000;   /* Divide by 2.0 */
        !           818:     case 0:                    /* Divide by 3.0 */
        !           819:     case 4: return 66000000; 
        !           820:     default: return -1;
        !           821:     }
        !           822: }
        !           823: 
        !           824: /* 
        !           825:  * Function : static int clock_to_ccf (int clock)
        !           826:  *
        !           827:  * Purpose :  Return the clock conversion factor for a given SCSI clock.
        !           828:  *
        !           829:  * Inputs : clock - SCSI clock expressed in Hz.
        !           830:  *
        !           831:  * Returns : ccf on success, -1 on failure.
        !           832:  */
        !           833: 
        !           834: static int 
        !           835: clock_to_ccf (int clock) {
        !           836:     if (clock < 16666666)
        !           837:        return -1;
        !           838:     if (clock < 25000000)
        !           839:        return 1;       /* Divide by 1.0 */
        !           840:     else if (clock < 37500000)
        !           841:        return 2;       /* Divide by 1.5 */
        !           842:     else if (clock < 50000000)
        !           843:        return 3;       /* Divide by 2.0 */
        !           844:     else if (clock < 66000000)
        !           845:        return 4;       /* Divide by 3.0 */
        !           846:     else 
        !           847:        return -1;
        !           848: }
        !           849:     
        !           850: /* 
        !           851:  * Function : static int NCR53c7x0_init (struct Scsi_Host *host)
        !           852:  *
        !           853:  * Purpose :  initialize the internal structures for a given SCSI host
        !           854:  *
        !           855:  * Inputs : host - pointer to this host adapter's structure
        !           856:  *
        !           857:  * Preconditions : when this function is called, the chip_type 
        !           858:  *     field of the hostdata structure MUST have been set.
        !           859:  *
        !           860:  * Returns : 0 on success, -1 on failure.
        !           861:  */
        !           862: 
        !           863: static int 
        !           864: NCR53c7x0_init (struct Scsi_Host *host) {
        !           865:     NCR53c7x0_local_declare();
        !           866:     int i, ccf, expected_ccf;
        !           867:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !           868:        host->hostdata;
        !           869:     struct Scsi_Host *search;
        !           870:     /* 
        !           871:      * There are some things which we need to know about in order to provide
        !           872:      * a semblance of support.  Print 'em if they aren't what we expect, 
        !           873:      * otherwise don't add to the noise.
        !           874:      * 
        !           875:      * -1 means we don't know what to expect.
        !           876:      */
        !           877:     int expected_id = -1;
        !           878:     int expected_clock = -1;
        !           879:     int uninitialized = 0;
        !           880:     /* 
        !           881:      * FIXME : this is only on Intel boxes.  On other platforms, this
        !           882:      * will differ.
        !           883:      */
        !           884:     int expected_mapping = OPTION_IO_MAPPED;
        !           885:     NCR53c7x0_local_setup(host);
        !           886: 
        !           887:     switch (hostdata->chip) {
        !           888:     case 820:
        !           889:     case 825:
        !           890: #ifdef notyet
        !           891:        host->max_id = 15;
        !           892: #endif
        !           893:        /* Fall through */
        !           894:     case 810:
        !           895:     case 815:
        !           896:        hostdata->dstat_sir_intr = NCR53c8x0_dstat_sir_intr;
        !           897:        hostdata->init_save_regs = NULL;
        !           898:        hostdata->dsa_fixup = NCR53c8xx_dsa_fixup;
        !           899:        hostdata->init_fixup = NCR53c8x0_init_fixup;
        !           900:        hostdata->soft_reset = NCR53c8x0_soft_reset;
        !           901:        hostdata->run_tests = NCR53c8xx_run_tests;
        !           902: /* Is the SCSI clock ever anything else on these chips? */
        !           903:        expected_clock = hostdata->scsi_clock = 40000000;
        !           904:        expected_id = 7;
        !           905:        break;
        !           906:     default:
        !           907:        printk ("scsi%d : chip type of %d is not supported yet, detaching.\n",
        !           908:            host->host_no, hostdata->chip);
        !           909:        scsi_unregister (host);
        !           910:        return -1;
        !           911:     }
        !           912: 
        !           913:     /* Assign constants accessed by NCR */
        !           914:     hostdata->NCR53c7xx_zero = 0;                      
        !           915:     hostdata->NCR53c7xx_msg_reject = MESSAGE_REJECT;
        !           916:     hostdata->NCR53c7xx_msg_abort = ABORT;
        !           917:     hostdata->NCR53c7xx_msg_nop = NOP;
        !           918:     hostdata->NOP_insn = (DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24;
        !           919: 
        !           920:     if (expected_mapping == -1 || 
        !           921:        (hostdata->options & (OPTION_MEMORY_MAPPED)) != 
        !           922:        (expected_mapping & OPTION_MEMORY_MAPPED))
        !           923:        printk ("scsi%d : using %s mapped access\n", host->host_no, 
        !           924:            (hostdata->options & OPTION_MEMORY_MAPPED) ? "memory" : 
        !           925:            "io");
        !           926: 
        !           927:     hostdata->dmode = (hostdata->chip == 700 || hostdata->chip == 70066) ? 
        !           928:        DMODE_REG_00 : DMODE_REG_10;
        !           929:     hostdata->istat = ((hostdata->chip / 100) == 8) ? 
        !           930:        ISTAT_REG_800 : ISTAT_REG_700;
        !           931: 
        !           932: /* Only the ISTAT register is readable when the NCR is running, so make 
        !           933:    sure it's halted. */
        !           934:     ncr_halt(host);
        !           935: 
        !           936: /* 
        !           937:  * XXX - the NCR53c700 uses bitfielded registers for SCID, SDID, etc,
        !           938:  *     as does the 710 with one bit per SCSI ID.  Conversely, the NCR
        !           939:  *     uses a normal, 3 bit binary representation of these values.
        !           940:  *
        !           941:  * Get the rest of the NCR documentation, and FIND OUT where the change
        !           942:  * was.
        !           943:  */
        !           944: #if 0
        !           945:     tmp = hostdata->this_id_mask = NCR53c7x0_read8(SCID_REG);
        !           946:     for (host->this_id = 0; tmp != 1; tmp >>=1, ++host->this_id);
        !           947: #else
        !           948:     host->this_id = NCR53c7x0_read8(SCID_REG) & 15;
        !           949:     if (host->this_id == 0)
        !           950:        host->this_id = 7;      /* sanitize hostid---0 doesn't make sense */
        !           951:     hostdata->this_id_mask = 1 << host->this_id;
        !           952: #endif
        !           953: 
        !           954: /*
        !           955:  * Note : we should never encounter a board setup for ID0.  So,
        !           956:  *     if we see ID0, assume that it was uninitialized and set it
        !           957:  *     to the industry standard 7.
        !           958:  */
        !           959:     if (!host->this_id) {
        !           960:        printk("scsi%d : initiator ID was %d, changing to 7\n",
        !           961:            host->host_no, host->this_id);
        !           962:        host->this_id = 7;
        !           963:        hostdata->this_id_mask = 1 << 7;
        !           964:        uninitialized = 1;
        !           965:     };
        !           966: 
        !           967:     if (expected_id == -1 || host->this_id != expected_id)
        !           968:        printk("scsi%d : using initiator ID %d\n", host->host_no,
        !           969:            host->this_id);
        !           970: 
        !           971:     /*
        !           972:      * Save important registers to allow a soft reset.
        !           973:      */
        !           974: 
        !           975:     if ((hostdata->chip / 100) == 8) {
        !           976:     /* 
        !           977:      * CTEST4 controls burst mode disable.
        !           978:      */
        !           979:        hostdata->saved_ctest4 = NCR53c7x0_read8(CTEST4_REG_800) & 
        !           980:            CTEST4_800_SAVE;
        !           981:     } else {
        !           982:     /*
        !           983:      * CTEST7 controls cache snooping, burst mode, and support for 
        !           984:      * external differential drivers.
        !           985:      */
        !           986:        hostdata->saved_ctest7 = NCR53c7x0_read8(CTEST7_REG) & CTEST7_SAVE;
        !           987:     }
        !           988: 
        !           989:     /*
        !           990:      * On NCR53c700 series chips, DCNTL controls the SCSI clock divisor,
        !           991:      * on 800 series chips, it allows for a totem-pole IRQ driver.
        !           992:      */
        !           993: 
        !           994:     hostdata->saved_dcntl = NCR53c7x0_read8(DCNTL_REG);
        !           995: 
        !           996:     /* 
        !           997:      * DCNTL_800_IRQM controls weather we are using an open drain
        !           998:      * driver (reset) or totem pole driver (set).  In all cases, 
        !           999:      * it's level active.  I suppose this is an issue when we're trying to 
        !          1000:      * wire-or the same PCI INTx line?
        !          1001:      */
        !          1002:     if ((hostdata->chip / 100) == 8)
        !          1003:        hostdata->saved_dcntl &= ~DCNTL_800_IRQM;
        !          1004: 
        !          1005:     /*
        !          1006:      * DMODE controls DMA burst length, and on 700 series chips,
        !          1007:      * 286 mode and bus width  
        !          1008:      */
        !          1009:     hostdata->saved_dmode = NCR53c7x0_read8(hostdata->dmode);
        !          1010: 
        !          1011:     /* 
        !          1012:      * Now that burst length and enabled/disabled status is known, 
        !          1013:      * clue the user in on it.  
        !          1014:      */
        !          1015:    
        !          1016:     if ((hostdata->chip / 100) == 8) {
        !          1017:        if (hostdata->saved_ctest4 & CTEST4_800_BDIS) {
        !          1018:            printk ("scsi%d : burst mode disabled\n", host->host_no);
        !          1019:        } else {
        !          1020:            switch (hostdata->saved_dmode & DMODE_BL_MASK) {
        !          1021:            case DMODE_BL_2: i = 2; break;
        !          1022:            case DMODE_BL_4: i = 4; break;
        !          1023:            case DMODE_BL_8: i = 8; break;
        !          1024:            case DMODE_BL_16: i = 16; break;
        !          1025:             default: i = 0;
        !          1026:            }
        !          1027:            printk ("scsi%d : burst length %d\n", host->host_no, i);
        !          1028:        }
        !          1029:     }
        !          1030: 
        !          1031:     /*
        !          1032:      * On NCR53c810 and NCR53c820 chips, SCNTL3 contails the synchronous
        !          1033:      * and normal clock conversion factors.
        !          1034:      */
        !          1035:     if (hostdata->chip / 100 == 8)  {
        !          1036:        expected_ccf = clock_to_ccf (expected_clock);
        !          1037:        hostdata->saved_scntl3 = NCR53c7x0_read8(SCNTL3_REG_800);
        !          1038:        ccf = hostdata->saved_scntl3 & SCNTL3_800_CCF_MASK;
        !          1039:        if (expected_ccf != -1 && ccf != expected_ccf && !ccf) {
        !          1040:            hostdata->saved_scntl3 = (hostdata->saved_scntl3 &
        !          1041:                ~SCNTL3_800_CCF_MASK) | expected_ccf;
        !          1042:            if (!uninitialized) {
        !          1043:                printk ("scsi%d : reset ccf to %d from %d\n", 
        !          1044:                    host->host_no, expected_ccf, ccf);
        !          1045:                uninitialized = 1;
        !          1046:            }
        !          1047:        }
        !          1048:     } else
        !          1049:        ccf = 0;
        !          1050: 
        !          1051:     /*
        !          1052:      * If we don't have a SCSI clock programmed, pick one on the upper
        !          1053:      * bound of that allowed by NCR so that our transfers err on the 
        !          1054:      * slow side, since transfer period must be >= the agreed 
        !          1055:      * upon period.
        !          1056:      */
        !          1057: 
        !          1058:     if ((!hostdata->scsi_clock) && (hostdata->scsi_clock = ccf_to_clock (ccf)) 
        !          1059:        == -1) {
        !          1060:        printk ("scsi%d : clock conversion factor %d unknown.\n"
        !          1061:                "         synchronous transfers disabled\n",
        !          1062:                host->host_no, ccf);
        !          1063:        hostdata->options &= ~OPTION_SYNCHRONOUS;
        !          1064:        hostdata->scsi_clock = 0; 
        !          1065:     }
        !          1066: 
        !          1067:     if (expected_clock == -1 || hostdata->scsi_clock != expected_clock)
        !          1068:        printk ("scsi%d : using %dMHz SCSI clock\n", host->host_no, 
        !          1069:            hostdata->scsi_clock / 1000000);
        !          1070: 
        !          1071:     for (i = 0; i < 16; ++i) 
        !          1072:        hostdata->cmd_allocated[i] = 0;
        !          1073: 
        !          1074:     if (hostdata->init_save_regs)
        !          1075:        hostdata->init_save_regs (host);
        !          1076:     if (hostdata->init_fixup)
        !          1077:        hostdata->init_fixup (host);
        !          1078: 
        !          1079:     if (!the_template) {
        !          1080:        the_template = host->hostt;
        !          1081:        first_host = host;
        !          1082:     }
        !          1083: 
        !          1084:     /* 
        !          1085:      * Linux SCSI drivers have always been plagued with initialization 
        !          1086:      * problems - some didn't work with the BIOS disabled since they expected
        !          1087:      * initialization from it, some didn't work when the networking code
        !          1088:      * was enabled and registers got scrambled, etc.
        !          1089:      *
        !          1090:      * To avoid problems like this, in the future, we will do a soft 
        !          1091:      * reset on the SCSI chip, taking it back to a sane state.
        !          1092:      */
        !          1093: 
        !          1094:     hostdata->soft_reset (host);
        !          1095: 
        !          1096: #if 1
        !          1097:     hostdata->debug_count_limit = -1;
        !          1098: #else
        !          1099:     hostdata->debug_count_limit = 1;
        !          1100: #endif
        !          1101:     hostdata->intrs = -1;
        !          1102:     hostdata->resets = -1;
        !          1103:     memcpy ((void *) hostdata->synchronous_want, (void *) sdtr_message, 
        !          1104:        sizeof (hostdata->synchronous_want));
        !          1105: 
        !          1106:     NCR53c7x0_driver_init (host);
        !          1107: 
        !          1108:     /*
        !          1109:      * Set up an interrupt handler if we aren't already sharing an IRQ
        !          1110:      * with another board.
        !          1111:      */
        !          1112: 
        !          1113:     for (search = first_host; search && !(search->hostt == the_template &&
        !          1114:        search->irq == host->irq && search != host); search=search->next);
        !          1115: 
        !          1116:     if (!search) {
        !          1117:        if (request_irq(host->irq, NCR53c7x0_intr, SA_INTERRUPT, "53c7,8xx")) {
        !          1118:            printk("scsi%d : IRQ%d not free, detaching\n"
        !          1119:                   "         You have either a configuration problem, or a\n"
        !          1120:                    "         broken BIOS.  You may wish to manually assign\n"
        !          1121:                   "         an interrupt to the NCR board rather than using\n"
        !          1122:                    "         an automatic setting.\n", 
        !          1123:                host->host_no, host->irq);
        !          1124:            scsi_unregister (host);
        !          1125:            return -1;
        !          1126:        } 
        !          1127:     } else {
        !          1128:        printk("scsi%d : using interrupt handler previously installed for scsi%d\n",
        !          1129:            host->host_no, search->host_no);
        !          1130:     }
        !          1131: 
        !          1132: 
        !          1133:     if ((hostdata->run_tests && hostdata->run_tests(host) == -1) ||
        !          1134:         (hostdata->options & OPTION_DEBUG_TESTS_ONLY)) {
        !          1135:        /* XXX Should disable interrupts, etc. here */
        !          1136:        scsi_unregister (host);
        !          1137:        return -1;
        !          1138:     } else {
        !          1139:        if (host->io_port)  {
        !          1140:            host->n_io_port = 128;
        !          1141:            request_region (host->io_port, host->n_io_port, "ncr53c7,8xx");
        !          1142:        }
        !          1143:     }
        !          1144:     
        !          1145:     if (NCR53c7x0_read8 (SBCL_REG) & SBCL_BSY) {
        !          1146:        printk ("scsi%d : bus wedge, doing SCSI reset\n", host->host_no);
        !          1147:        hard_reset (host);
        !          1148:     }
        !          1149:     return 0;
        !          1150: }
        !          1151: 
        !          1152: /* 
        !          1153:  * Function : static int normal_init(Scsi_Host_Template *tpnt, int board, 
        !          1154:  *     int chip, u32 base, int io_port, int irq, int dma, int pcivalid,
        !          1155:  *     unsigned char pci_bus, unsigned char pci_device_fn,
        !          1156:  *     long long options);
        !          1157:  *
        !          1158:  * Purpose : initializes a NCR53c7,8x0 based on base addresses,
        !          1159:  *     IRQ, and DMA channel.   
        !          1160:  *     
        !          1161:  *     Useful where a new NCR chip is backwards compatible with
        !          1162:  *     a supported chip, but the DEVICE ID has changed so it 
        !          1163:  *     doesn't show up when the autoprobe does a pcibios_find_device.
        !          1164:  *
        !          1165:  * Inputs : tpnt - Template for this SCSI adapter, board - board level
        !          1166:  *     product, chip - 810, 820, or 825, bus - PCI bus, device_fn -
        !          1167:  *     device and function encoding as used by PCI BIOS calls.
        !          1168:  * 
        !          1169:  * Returns : 0 on success, -1 on failure.
        !          1170:  *
        !          1171:  */
        !          1172: 
        !          1173: static int 
        !          1174: normal_init (Scsi_Host_Template *tpnt, int board, int chip, 
        !          1175:     u32 base, int io_port, int irq, int dma, int pci_valid, 
        !          1176:     unsigned char pci_bus, unsigned char pci_device_fn, long long options) {
        !          1177:     struct Scsi_Host *instance;
        !          1178:     struct NCR53c7x0_hostdata *hostdata;
        !          1179:     char chip_str[80];
        !          1180:     int script_len = 0, dsa_len = 0, size = 0, max_cmd_size = 0, 
        !          1181:        schedule_size = 0, ok = 0;
        !          1182:     void *tmp;
        !          1183: 
        !          1184:     options |= perm_options;
        !          1185: 
        !          1186:     switch (chip) {
        !          1187:     case 825:
        !          1188:     case 820:
        !          1189:     case 815:
        !          1190:     case 810:
        !          1191:        schedule_size = (tpnt->can_queue + 1) * 8 /* JUMP instruction size */;
        !          1192:        script_len = NCR53c8xx_script_len;
        !          1193:        dsa_len = NCR53c8xx_dsa_len;
        !          1194:        options |= OPTION_INTFLY;
        !          1195:        sprintf (chip_str, "NCR53c%d", chip);
        !          1196:        break;
        !          1197:     default:
        !          1198:        printk("scsi-ncr53c7,8xx : unsupported SCSI chip %d\n", chip);
        !          1199:        return -1;
        !          1200:     }
        !          1201: 
        !          1202:     printk("scsi-ncr53c7,8xx : %s at memory 0x%x, io 0x%x, irq %d",
        !          1203:        chip_str, (unsigned) base, io_port, irq);
        !          1204:     if (dma == DMA_NONE)
        !          1205:        printk("\n");
        !          1206:     else 
        !          1207:        printk(", dma %d\n", dma);
        !          1208: 
        !          1209:     if ((chip / 100 == 8) && !pci_valid) 
        !          1210:        printk ("scsi-ncr53c7,8xx : for better reliability and performance, please use the\n" 
        !          1211:                "        PCI override instead.\n"
        !          1212:                "        Syntax : ncr53c8{10,15,20,25}=pci,<bus>,<device>,<function>\n"
        !          1213:                "                 <bus> and <device> are usually 0.\n");
        !          1214: 
        !          1215:     if (options & OPTION_DEBUG_PROBE_ONLY) {
        !          1216:        printk ("scsi-ncr53c7,8xx : probe only enabled, aborting initialization\n");
        !          1217:        return -1;
        !          1218:     }
        !          1219: 
        !          1220:     max_cmd_size = sizeof(struct NCR53c7x0_cmd) + dsa_len +
        !          1221:        /* Size of dynamic part of command structure : */
        !          1222:        2 * /* Worst case : we don't know if we need DATA IN or DATA out */
        !          1223:                ( 2 * /* Current instructions per scatter/gather segment */ 
        !          1224:                  tpnt->sg_tablesize + 
        !          1225:                   3 /* Current startup / termination required per phase */
        !          1226:                ) *
        !          1227:        8 /* Each instruction is eight bytes */;
        !          1228: 
        !          1229:     /* Allocate fixed part of hostdata, dynamic part to hold appropriate
        !          1230:        SCSI SCRIPT(tm) plus a single, maximum-sized NCR53c7x0_cmd structure.
        !          1231: 
        !          1232:        We need a NCR53c7x0_cmd structure for scan_scsis() when we are 
        !          1233:        not loaded as a module, and when we're loaded as a module, we 
        !          1234:        can't use a non-dynamically allocated structure because modules
        !          1235:        are vmalloc()'d, which can allow structures to cross page 
        !          1236:        boundaries and breaks our physical/virtual address assumptions
        !          1237:        for DMA.
        !          1238: 
        !          1239:        So, we stick it past the end of our hostdata structure.
        !          1240: 
        !          1241:        ASSUMPTION : 
        !          1242:                 Regardless of how many simultaneous SCSI commands we allow,
        !          1243:         the probe code only executes a _single_ instruction at a time,
        !          1244:         so we only need one here, and don't need to allocate NCR53c7x0_cmd
        !          1245:         structures for each target until we are no longer in scan_scsis
        !          1246:         and kmalloc() has become functional (memory_init() happens 
        !          1247:         after all device driver initialization).
        !          1248:     */
        !          1249: 
        !          1250:     size = sizeof(struct NCR53c7x0_hostdata) + script_len + 
        !          1251:     /* Note that alignment will be guaranteed, since we put the command
        !          1252:        allocated at probe time after the fixed-up SCSI script, which 
        !          1253:        consists of 32 bit words, aligned on a 32 bit boundary.  But
        !          1254:        on a 64bit machine we need 8 byte alignment for hostdata->free, so
        !          1255:        we add in another 4 bytes to take care of potential misalignment
        !          1256:        */
        !          1257:        (sizeof(void *) - sizeof(u32)) + max_cmd_size + schedule_size;
        !          1258: 
        !          1259:     instance = scsi_register (tpnt, size);
        !          1260:     if (!instance)
        !          1261:        return -1;
        !          1262: 
        !          1263:     /* FIXME : if we ever support an ISA NCR53c7xx based board, we
        !          1264:        need to check if the chip is running in a 16 bit mode, and if so 
        !          1265:        unregister it if it is past the 16M (0x1000000) mark */
        !          1266:        
        !          1267:     hostdata = (struct NCR53c7x0_hostdata *) 
        !          1268:        instance->hostdata;
        !          1269:     hostdata->size = size;
        !          1270:     hostdata->script_count = script_len / sizeof(u32);
        !          1271:     hostdata = (struct NCR53c7x0_hostdata *) instance->hostdata;
        !          1272:     hostdata->board = board;
        !          1273:     hostdata->chip = chip;
        !          1274:     if ((hostdata->pci_valid = pci_valid)) {
        !          1275:        hostdata->pci_bus = pci_bus;
        !          1276:        hostdata->pci_device_fn = pci_device_fn;
        !          1277:     }
        !          1278: 
        !          1279:     /*
        !          1280:      * Being memory mapped is more desirable, since 
        !          1281:      *
        !          1282:      * - Memory accesses may be faster.
        !          1283:      *
        !          1284:      * - The destination and source address spaces are the same for 
        !          1285:      *  all instructions, meaning we don't have to twiddle dmode or 
        !          1286:      *  any other registers.
        !          1287:      *
        !          1288:      * So, we try for memory mapped, and if we don't get it,
        !          1289:      * we go for port mapped, and that failing we tell the user
        !          1290:      * it can't work.
        !          1291:      */
        !          1292: 
        !          1293:     if (base) {
        !          1294:        instance->base = (unsigned char *) (unsigned long) base;
        !          1295:        /* Check for forced I/O mapping */
        !          1296:        if (!(options & OPTION_IO_MAPPED)) {
        !          1297:            options |= OPTION_MEMORY_MAPPED;
        !          1298:            ok = 1;
        !          1299:        }
        !          1300:     } else {
        !          1301:        options &= ~OPTION_MEMORY_MAPPED;
        !          1302:     }
        !          1303: 
        !          1304:     if (io_port) {
        !          1305:        instance->io_port = io_port;
        !          1306:        options |= OPTION_IO_MAPPED;
        !          1307:        ok = 1;
        !          1308:     } else {
        !          1309:        options &= ~OPTION_IO_MAPPED;
        !          1310:     }
        !          1311: 
        !          1312:     if (!ok) {
        !          1313:        printk ("scsi%d : not initializing, no I/O or memory mapping known \n",
        !          1314:            instance->host_no);
        !          1315:        scsi_unregister (instance);
        !          1316:        return -1;
        !          1317:     }
        !          1318:     instance->irq = irq;
        !          1319:     instance->dma_channel = dma;
        !          1320: 
        !          1321:     hostdata->options = options;
        !          1322:     hostdata->dsa_len = dsa_len;
        !          1323:     hostdata->max_cmd_size = max_cmd_size;
        !          1324:     hostdata->num_cmds = 1;
        !          1325:     /* Initialize single command */
        !          1326:     tmp = (hostdata->script + hostdata->script_count);
        !          1327:     hostdata->free = ROUNDUP(tmp, void *);
        !          1328:     hostdata->free->real = tmp;
        !          1329:     hostdata->free->size = max_cmd_size;
        !          1330:     hostdata->free->free = NULL;
        !          1331:     hostdata->free->next = NULL;
        !          1332:     hostdata->extra_allocate = 0;
        !          1333: 
        !          1334:     /* Allocate command start code space */
        !          1335:     hostdata->schedule = (chip == 700 || chip == 70066) ?
        !          1336:        NULL : (u32 *) ((char *)hostdata->free + max_cmd_size);
        !          1337: 
        !          1338: /* 
        !          1339:  * For diagnostic purposes, we don't really care how fast things blaze.
        !          1340:  * For profiling, we want to access the 800ns resolution system clock,
        !          1341:  * using a 'C' call on the host processor.
        !          1342:  *
        !          1343:  * Therefore, there's no need for the NCR chip to directly manipulate
        !          1344:  * this data, and we should put it wherever is most convienient for 
        !          1345:  * Linux.
        !          1346:  */
        !          1347:     if (track_events) 
        !          1348:        hostdata->events = (struct NCR53c7x0_event *) (track_events ? 
        !          1349:            vmalloc (sizeof (struct NCR53c7x0_event) * track_events) : NULL);
        !          1350:     else
        !          1351:        hostdata->events = NULL;
        !          1352: 
        !          1353:     if (hostdata->events) {
        !          1354:        memset ((void *) hostdata->events, 0, sizeof(struct NCR53c7x0_event) *
        !          1355:            track_events);      
        !          1356:        hostdata->event_size = track_events;
        !          1357:        hostdata->event_index = 0;
        !          1358:     } else 
        !          1359:        hostdata->event_size = 0;
        !          1360: 
        !          1361:     return NCR53c7x0_init(instance);
        !          1362: }
        !          1363: 
        !          1364: 
        !          1365: /* 
        !          1366:  * Function : static int ncr_pci_init(Scsi_Host_Template *tpnt, int board, 
        !          1367:  *     int chip, int bus, int device_fn, long long options)
        !          1368:  *
        !          1369:  * Purpose : initializes a NCR53c800 family based on the PCI
        !          1370:  *     bus, device, and function location of it.  Allows 
        !          1371:  *     reprogramming of latency timer and determining addresses
        !          1372:  *     and whether bus mastering, etc. are OK.
        !          1373:  *     
        !          1374:  *     Useful where a new NCR chip is backwards compatible with
        !          1375:  *     a supported chip, but the DEVICE ID has changed so it 
        !          1376:  *     doesn't show up when the autoprobe does a pcibios_find_device.
        !          1377:  *
        !          1378:  * Inputs : tpnt - Template for this SCSI adapter, board - board level
        !          1379:  *     product, chip - 810, 820, or 825, bus - PCI bus, device_fn -
        !          1380:  *     device and function encoding as used by PCI BIOS calls.
        !          1381:  * 
        !          1382:  * Returns : 0 on success, -1 on failure.
        !          1383:  *
        !          1384:  */
        !          1385: 
        !          1386: static int 
        !          1387: ncr_pci_init (Scsi_Host_Template *tpnt, int board, int chip, 
        !          1388:     unsigned char bus, unsigned char device_fn, long long options) {
        !          1389:     unsigned short vendor_id, device_id, command;
        !          1390: #ifdef LINUX_1_2
        !          1391:     unsigned long
        !          1392: #else
        !          1393:     unsigned int 
        !          1394: #endif
        !          1395:        base, io_port; 
        !          1396:     unsigned char irq, revision;
        !          1397:     int error, expected_chip;
        !          1398:     int expected_id = -1, max_revision = -1, min_revision = -1;
        !          1399:     int i;
        !          1400: 
        !          1401:     printk("scsi-ncr53c7,8xx : at PCI bus %d, device %d,  function %d\n",
        !          1402:        bus, (int) (device_fn & 0xf8) >> 3, 
        !          1403:        (int) device_fn & 7);
        !          1404: 
        !          1405:     if (!pcibios_present()) {
        !          1406:        printk("scsi-ncr53c7,8xx : not initializing due to lack of PCI BIOS,\n"
        !          1407:               "        try using memory, port, irq override instead.\n");
        !          1408:        return -1;
        !          1409:     }
        !          1410: 
        !          1411:     if ((error = pcibios_read_config_word (bus, device_fn, PCI_VENDOR_ID, 
        !          1412:        &vendor_id)) ||
        !          1413:        (error = pcibios_read_config_word (bus, device_fn, PCI_DEVICE_ID, 
        !          1414:            &device_id)) ||
        !          1415:        (error = pcibios_read_config_word (bus, device_fn, PCI_COMMAND, 
        !          1416:            &command)) ||
        !          1417:        (error = pcibios_read_config_dword (bus, device_fn, 
        !          1418:            PCI_BASE_ADDRESS_0, &io_port)) || 
        !          1419:        (error = pcibios_read_config_dword (bus, device_fn, 
        !          1420:            PCI_BASE_ADDRESS_1, &base)) ||
        !          1421:        (error = pcibios_read_config_byte (bus, device_fn, PCI_CLASS_REVISION,
        !          1422:            &revision)) ||
        !          1423:        (error = pcibios_read_config_byte (bus, device_fn, PCI_INTERRUPT_LINE,
        !          1424:            &irq))) {
        !          1425:        printk ("scsi-ncr53c7,8xx : error %s not initializing due to error reading configuration space\n"
        !          1426:                "        perhaps you specified an incorrect PCI bus, device, or function.\n"
        !          1427:                , pcibios_strerror(error));
        !          1428:        return -1;
        !          1429:     }
        !          1430: 
        !          1431:     /* If any one ever clones the NCR chips, this will have to change */
        !          1432: 
        !          1433:     if (vendor_id != PCI_VENDOR_ID_NCR) {
        !          1434:        printk ("scsi-ncr53c7,8xx : not initializing, 0x%04x is not NCR vendor ID\n",
        !          1435:            (int) vendor_id);
        !          1436:        return -1;
        !          1437:     }
        !          1438: 
        !          1439: 
        !          1440:     /* 
        !          1441:      * Bit 0 is the address space indicator and must be one for I/O
        !          1442:      * space mappings, bit 1 is reserved, discard them after checking
        !          1443:      * that they have the correct value of 1.
        !          1444:      */
        !          1445: 
        !          1446:     if (command & PCI_COMMAND_IO) { 
        !          1447:        if ((io_port & 3) != 1) {
        !          1448:            printk ("scsi-ncr53c7,8xx : disabling I/O mapping since base address 0 (0x%x)\n"
        !          1449:                    "        bits 0..1 indicate a non-IO mapping\n",
        !          1450:                (unsigned) io_port);
        !          1451:            io_port = 0;
        !          1452:        } else
        !          1453:            io_port &= PCI_BASE_ADDRESS_IO_MASK;
        !          1454:     } else {
        !          1455:        io_port = 0;
        !          1456:     }
        !          1457: 
        !          1458:     if (command & PCI_COMMAND_MEMORY) {
        !          1459:        if ((base & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) {
        !          1460:            printk("scsi-ncr53c7,8xx : disabling memory mapping since base address 1\n"
        !          1461:                   "        contains a non-memory mapping\n");
        !          1462:            base = 0;
        !          1463:        } else 
        !          1464:            base &= PCI_BASE_ADDRESS_MEM_MASK;
        !          1465:     } else {
        !          1466:        base = 0;
        !          1467:     }
        !          1468:        
        !          1469:     if (!io_port && !base) {
        !          1470:        printk ("scsi-ncr53c7,8xx : not initializing, both I/O and memory mappings disabled\n");
        !          1471:        return -1;
        !          1472:     }
        !          1473:        
        !          1474:     if (!(command & PCI_COMMAND_MASTER)) {
        !          1475:        printk ("scsi-ncr53c7,8xx : not initializing, BUS MASTERING was disabled\n");
        !          1476:        return -1;
        !          1477:     }
        !          1478: 
        !          1479:     for (i = 0; i < NPCI_CHIP_IDS; ++i) {
        !          1480:        if (device_id == pci_chip_ids[i].pci_device_id) {
        !          1481:            max_revision = pci_chip_ids[i].max_revision;
        !          1482:            min_revision = pci_chip_ids[i].min_revision;
        !          1483:            expected_chip = pci_chip_ids[i].chip;
        !          1484:        }
        !          1485:        if (chip == pci_chip_ids[i].chip)
        !          1486:            expected_id = pci_chip_ids[i].pci_device_id;
        !          1487:     }
        !          1488: 
        !          1489:     if (chip && device_id != expected_id) 
        !          1490:        printk ("scsi-ncr53c7,8xx : warning : device id of 0x%04x doesn't\n"
        !          1491:                 "                   match expected 0x%04x\n",
        !          1492:            (unsigned int) device_id, (unsigned int) expected_id );
        !          1493:     
        !          1494:     if (max_revision != -1 && revision > max_revision) 
        !          1495:        printk ("scsi-ncr53c7,8xx : warning : revision of %d is greater than %d.\n",
        !          1496:            (int) revision, max_revision);
        !          1497:     else if (min_revision != -1 && revision < min_revision)
        !          1498:        printk ("scsi-ncr53c7,8xx : warning : revision of %d is less than %d.\n",
        !          1499:            (int) revision, min_revision);
        !          1500: 
        !          1501:     if (io_port && check_region (io_port, 128)) {
        !          1502:        printk ("scsi-ncr53c7,8xx : IO region 0x%x to 0x%x is in use\n",
        !          1503:            (unsigned) io_port, (unsigned) io_port + 127);
        !          1504:        return -1;
        !          1505:     }
        !          1506: 
        !          1507:     return normal_init (tpnt, board, chip, (int) base, io_port, 
        !          1508:        (int) irq, DMA_NONE, 1, bus, device_fn, options);
        !          1509: }
        !          1510: 
        !          1511: 
        !          1512: /* 
        !          1513:  * Function : int NCR53c7xx_detect(Scsi_Host_Template *tpnt)
        !          1514:  *
        !          1515:  * Purpose : detects and initializes NCR53c7,8x0 SCSI chips
        !          1516:  *     that were autoprobed, overridden on the LILO command line, 
        !          1517:  *     or specified at compile time.
        !          1518:  *
        !          1519:  * Inputs : tpnt - template for this SCSI adapter
        !          1520:  * 
        !          1521:  * Returns : number of host adapters detected
        !          1522:  *
        !          1523:  */
        !          1524: 
        !          1525: int 
        !          1526: NCR53c7xx_detect(Scsi_Host_Template *tpnt) {
        !          1527:     int i;
        !          1528:     int current_override;
        !          1529:     int count;                 /* Number of boards detected */
        !          1530:     unsigned char pci_bus, pci_device_fn;
        !          1531:     static short pci_index=0;  /* Device index to PCI BIOS calls */
        !          1532: 
        !          1533: #ifndef LINUX_1_2
        !          1534:     tpnt->proc_dir = &proc_scsi_ncr53c7xx;
        !          1535: #endif
        !          1536: 
        !          1537:     for (current_override = count = 0; current_override < OVERRIDE_LIMIT; 
        !          1538:         ++current_override) {
        !          1539:         if (overrides[current_override].pci ? 
        !          1540:            !ncr_pci_init (tpnt, overrides[current_override].board,
        !          1541:                overrides[current_override].chip,
        !          1542:                (unsigned char) overrides[current_override].data.pci.bus,
        !          1543:                (((overrides[current_override].data.pci.device
        !          1544:                << 3) & 0xf8)|(overrides[current_override].data.pci.function & 
        !          1545:                7)), overrides[current_override].options):
        !          1546:            !normal_init (tpnt, overrides[current_override].board, 
        !          1547:                overrides[current_override].chip, 
        !          1548:                overrides[current_override].data.normal.base, 
        !          1549:                overrides[current_override].data.normal.io_port,
        !          1550:                overrides[current_override].data.normal.irq,
        !          1551:                overrides[current_override].data.normal.dma,
        !          1552:                0 /* PCI data invalid */, 0 /* PCI bus place holder */,  
        !          1553:                0 /* PCI device_function place holder */,
        !          1554:                overrides[current_override].options)) {
        !          1555:            ++count;
        !          1556:        } 
        !          1557:     }
        !          1558: 
        !          1559:     if (pcibios_present()) {
        !          1560:        for (i = 0; i < NPCI_CHIP_IDS; ++i) 
        !          1561:            for (pci_index = 0;
        !          1562:                !pcibios_find_device (PCI_VENDOR_ID_NCR, 
        !          1563:                    pci_chip_ids[i].pci_device_id, pci_index, &pci_bus, 
        !          1564:                    &pci_device_fn); 
        !          1565:                ++pci_index)
        !          1566:                if (!ncr_pci_init (tpnt, BOARD_GENERIC, pci_chip_ids[i].chip, 
        !          1567:                    pci_bus, pci_device_fn, /* no options */ 0))
        !          1568:                    ++count;
        !          1569:     }
        !          1570:     return count;
        !          1571: }
        !          1572: 
        !          1573: /* NCR53c810 and NCR53c820 script handling code */
        !          1574: 
        !          1575: #include "53c8xx_d.h"
        !          1576: #ifdef A_int_debug_sync
        !          1577: #define DEBUG_SYNC_INTR A_int_debug_sync
        !          1578: #endif
        !          1579: static int NCR53c8xx_script_len = sizeof (SCRIPT);
        !          1580: static int NCR53c8xx_dsa_len = A_dsa_end + Ent_dsa_zero - Ent_dsa_code_template;
        !          1581: 
        !          1582: /* 
        !          1583:  * Function : static void NCR53c8x0_init_fixup (struct Scsi_Host *host)
        !          1584:  *
        !          1585:  * Purpose :  copy and fixup the SCSI SCRIPTS(tm) code for this device.
        !          1586:  *
        !          1587:  * Inputs : host - pointer to this host adapter's structure
        !          1588:  *
        !          1589:  */
        !          1590: 
        !          1591: static void 
        !          1592: NCR53c8x0_init_fixup (struct Scsi_Host *host) {
        !          1593:     NCR53c7x0_local_declare();
        !          1594:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          1595:        host->hostdata;
        !          1596:     unsigned char tmp;
        !          1597:     int i, ncr_to_memory, memory_to_ncr;
        !          1598:     u32 base;
        !          1599:     NCR53c7x0_local_setup(host);
        !          1600: 
        !          1601: 
        !          1602:     /* XXX - NOTE : this code MUST be made endian aware */
        !          1603:     /*  Copy code into buffer that was allocated at detection time.  */
        !          1604:     memcpy ((void *) hostdata->script, (void *) SCRIPT, 
        !          1605:        sizeof(SCRIPT));
        !          1606:     /* Fixup labels */
        !          1607:     for (i = 0; i < PATCHES; ++i) 
        !          1608:        hostdata->script[LABELPATCHES[i]] += 
        !          1609:            virt_to_bus(hostdata->script);
        !          1610:     /* Fixup addresses of constants that used to be EXTERNAL */
        !          1611: 
        !          1612:     patch_abs_32 (hostdata->script, 0, NCR53c7xx_msg_abort, 
        !          1613:        virt_to_bus(&(hostdata->NCR53c7xx_msg_abort)));
        !          1614:     patch_abs_32 (hostdata->script, 0, NCR53c7xx_msg_reject, 
        !          1615:        virt_to_bus(&(hostdata->NCR53c7xx_msg_reject)));
        !          1616:     patch_abs_32 (hostdata->script, 0, NCR53c7xx_zero, 
        !          1617:        virt_to_bus(&(hostdata->NCR53c7xx_zero)));
        !          1618:     patch_abs_32 (hostdata->script, 0, NCR53c7xx_sink, 
        !          1619:        virt_to_bus(&(hostdata->NCR53c7xx_sink)));
        !          1620:     patch_abs_32 (hostdata->script, 0, NOP_insn,
        !          1621:        virt_to_bus(&(hostdata->NOP_insn)));
        !          1622:     patch_abs_32 (hostdata->script, 0, schedule,
        !          1623:        virt_to_bus((void *) hostdata->schedule));
        !          1624: 
        !          1625:     /* Fixup references to external variables: */
        !          1626:     for (i = 0; i < EXTERNAL_PATCHES_LEN; ++i)
        !          1627:        hostdata->script[EXTERNAL_PATCHES[i].offset] +=
        !          1628:          virt_to_bus(EXTERNAL_PATCHES[i].address);
        !          1629: 
        !          1630:     /* 
        !          1631:      * Fixup absolutes set at boot-time.
        !          1632:      * 
        !          1633:      * All non-code absolute variables suffixed with "dsa_" and "int_"
        !          1634:      * are constants, and need no fixup provided the assembler has done 
        !          1635:      * it for us (I don't know what the "real" NCR assembler does in 
        !          1636:      * this case, my assembler does the right magic).
        !          1637:      */
        !          1638: 
        !          1639:     patch_abs_rwri_data (hostdata->script, 0, dsa_save_data_pointer, 
        !          1640:        Ent_dsa_code_save_data_pointer - Ent_dsa_zero);
        !          1641:     patch_abs_rwri_data (hostdata->script, 0, dsa_restore_pointers,
        !          1642:        Ent_dsa_code_restore_pointers - Ent_dsa_zero);
        !          1643:     patch_abs_rwri_data (hostdata->script, 0, dsa_check_reselect,
        !          1644:        Ent_dsa_code_check_reselect - Ent_dsa_zero);
        !          1645: 
        !          1646:     /*
        !          1647:      * Just for the hell of it, preserve the settings of 
        !          1648:      * Burst Length and Enable Read Line bits from the DMODE 
        !          1649:      * register.  Make sure SCRIPTS start automagically.
        !          1650:      */
        !          1651: 
        !          1652:     tmp = NCR53c7x0_read8(DMODE_REG_10);
        !          1653:     tmp &= (DMODE_800_ERL | DMODE_BL_MASK);
        !          1654: 
        !          1655:     if (!(hostdata->options & OPTION_MEMORY_MAPPED)) {
        !          1656:        base = (u32) host->io_port;
        !          1657:        memory_to_ncr = tmp|DMODE_800_DIOM;
        !          1658:        ncr_to_memory = tmp|DMODE_800_SIOM;
        !          1659:     } else {
        !          1660:        base = virt_to_bus(host->base);
        !          1661:        memory_to_ncr = ncr_to_memory = tmp;
        !          1662:     }
        !          1663: 
        !          1664:     patch_abs_32 (hostdata->script, 0, addr_scratch, base + SCRATCHA_REG_800);
        !          1665:     patch_abs_32 (hostdata->script, 0, addr_temp, base + TEMP_REG);
        !          1666: 
        !          1667:     /*
        !          1668:      * I needed some variables in the script to be accessible to 
        !          1669:      * both the NCR chip and the host processor. For these variables,
        !          1670:      * I made the arbitrary decision to store them directly in the 
        !          1671:      * hostdata structure rather than in the RELATIVE area of the 
        !          1672:      * SCRIPTS.
        !          1673:      */
        !          1674:     
        !          1675: 
        !          1676:     patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_memory, tmp);
        !          1677:     patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_ncr, memory_to_ncr);
        !          1678:     patch_abs_rwri_data (hostdata->script, 0, dmode_ncr_to_memory, ncr_to_memory);
        !          1679: 
        !          1680:     patch_abs_32 (hostdata->script, 0, msg_buf, 
        !          1681:        virt_to_bus((void *)&(hostdata->msg_buf)));
        !          1682:     patch_abs_32 (hostdata->script, 0, reconnect_dsa_head, 
        !          1683:        virt_to_bus((void *)&(hostdata->reconnect_dsa_head)));
        !          1684:     patch_abs_32 (hostdata->script, 0, addr_reconnect_dsa_head, 
        !          1685:        virt_to_bus((void *)&(hostdata->addr_reconnect_dsa_head)));
        !          1686:     patch_abs_32 (hostdata->script, 0, reselected_identify, 
        !          1687:        virt_to_bus((void *)&(hostdata->reselected_identify)));
        !          1688: /* reselected_tag is currently unused */
        !          1689: #if 0
        !          1690:     patch_abs_32 (hostdata->script, 0, reselected_tag, 
        !          1691:        virt_to_bus((void *)&(hostdata->reselected_tag)));
        !          1692: #endif
        !          1693: 
        !          1694:     patch_abs_32 (hostdata->script, 0, test_dest, 
        !          1695:        virt_to_bus((void*)&hostdata->test_dest));
        !          1696:     patch_abs_32 (hostdata->script, 0, test_src, 
        !          1697:        virt_to_bus(&hostdata->test_source));
        !          1698: 
        !          1699:     patch_abs_rwri_data (hostdata->script, 0, dsa_check_reselect, 
        !          1700:        (unsigned char)(Ent_dsa_code_check_reselect - Ent_dsa_zero));
        !          1701: 
        !          1702: /* These are for event logging; the ncr_event enum contains the 
        !          1703:    actual interrupt numbers. */
        !          1704: #ifdef A_int_EVENT_SELECT
        !          1705:    patch_abs_32 (hostdata->script, 0, int_EVENT_SELECT, (u32) EVENT_SELECT);
        !          1706: #endif
        !          1707: #ifdef A_int_EVENT_DISCONNECT
        !          1708:    patch_abs_32 (hostdata->script, 0, int_EVENT_DISCONNECT, (u32) EVENT_DISCONNECT);
        !          1709: #endif
        !          1710: #ifdef A_int_EVENT_RESELECT
        !          1711:    patch_abs_32 (hostdata->script, 0, int_EVENT_RESELECT, (u32) EVENT_RESELECT);
        !          1712: #endif
        !          1713: #ifdef A_int_EVENT_COMPLETE
        !          1714:    patch_abs_32 (hostdata->script, 0, int_EVENT_COMPLETE, (u32) EVENT_COMPLETE);
        !          1715: #endif
        !          1716: #ifdef A_int_EVENT_IDLE
        !          1717:    patch_abs_32 (hostdata->script, 0, int_EVENT_IDLE, (u32) EVENT_IDLE);
        !          1718: #endif
        !          1719: #ifdef A_int_EVENT_SELECT_FAILED
        !          1720:    patch_abs_32 (hostdata->script, 0, int_EVENT_SELECT_FAILED, 
        !          1721:        (u32) EVENT_SELECT_FAILED);
        !          1722: #endif
        !          1723: #ifdef A_int_EVENT_BEFORE_SELECT
        !          1724:    patch_abs_32 (hostdata->script, 0, int_EVENT_BEFORE_SELECT,
        !          1725:        (u32) EVENT_BEFORE_SELECT);
        !          1726: #endif
        !          1727: #ifdef A_int_EVENT_RESELECT_FAILED
        !          1728:    patch_abs_32 (hostdata->script, 0, int_EVENT_RESELECT_FAILED, 
        !          1729:        (u32) EVENT_RESELECT_FAILED);
        !          1730: #endif
        !          1731: 
        !          1732:     /*
        !          1733:      * Make sure the NCR and Linux code agree on the location of 
        !          1734:      * certain fields.
        !          1735:      */
        !          1736: 
        !          1737:     hostdata->E_accept_message = Ent_accept_message;
        !          1738:     hostdata->E_command_complete = Ent_command_complete;               
        !          1739:     hostdata->E_cmdout_cmdout = Ent_cmdout_cmdout;
        !          1740:     hostdata->E_data_transfer = Ent_data_transfer;
        !          1741:     hostdata->E_debug_break = Ent_debug_break; 
        !          1742:     hostdata->E_dsa_code_template = Ent_dsa_code_template;
        !          1743:     hostdata->E_dsa_code_template_end = Ent_dsa_code_template_end;
        !          1744:     hostdata->E_end_data_transfer = Ent_end_data_transfer;
        !          1745:     hostdata->E_initiator_abort = Ent_initiator_abort;
        !          1746:     hostdata->E_msg_in = Ent_msg_in;
        !          1747:     hostdata->E_other_transfer = Ent_other_transfer;
        !          1748:     hostdata->E_other_in = Ent_other_in;
        !          1749:     hostdata->E_other_out = Ent_other_out;
        !          1750:     hostdata->E_reject_message = Ent_reject_message;
        !          1751:     hostdata->E_respond_message = Ent_respond_message;
        !          1752:     hostdata->E_select = Ent_select;
        !          1753:     hostdata->E_select_msgout = Ent_select_msgout;
        !          1754:     hostdata->E_target_abort = Ent_target_abort;
        !          1755: #ifdef Ent_test_0
        !          1756:     hostdata->E_test_0 = Ent_test_0;
        !          1757: #endif
        !          1758:     hostdata->E_test_1 = Ent_test_1;
        !          1759:     hostdata->E_test_2 = Ent_test_2;
        !          1760: #ifdef Ent_test_3
        !          1761:     hostdata->E_test_3 = Ent_test_3;
        !          1762: #endif
        !          1763:     hostdata->E_wait_reselect = Ent_wait_reselect;
        !          1764:     hostdata->E_dsa_code_begin = Ent_dsa_code_begin;
        !          1765: 
        !          1766:     hostdata->dsa_cmdout = A_dsa_cmdout;
        !          1767:     hostdata->dsa_cmnd = A_dsa_cmnd;
        !          1768:     hostdata->dsa_datain = A_dsa_datain;
        !          1769:     hostdata->dsa_dataout = A_dsa_dataout;
        !          1770:     hostdata->dsa_end = A_dsa_end;                     
        !          1771:     hostdata->dsa_msgin = A_dsa_msgin;
        !          1772:     hostdata->dsa_msgout = A_dsa_msgout;
        !          1773:     hostdata->dsa_msgout_other = A_dsa_msgout_other;
        !          1774:     hostdata->dsa_next = A_dsa_next;
        !          1775:     hostdata->dsa_select = A_dsa_select;
        !          1776:     hostdata->dsa_start = Ent_dsa_code_template - Ent_dsa_zero;
        !          1777:     hostdata->dsa_status = A_dsa_status;
        !          1778:     hostdata->dsa_jump_dest = Ent_dsa_code_fix_jump - Ent_dsa_zero + 
        !          1779:        8 /* destination operand */;
        !          1780: 
        !          1781:     /* sanity check */
        !          1782:     if (A_dsa_fields_start != Ent_dsa_code_template_end - 
        !          1783:        Ent_dsa_zero) 
        !          1784:        printk("scsi%d : NCR dsa_fields start is %d not %d\n",
        !          1785:            host->host_no, A_dsa_fields_start, Ent_dsa_code_template_end - 
        !          1786:            Ent_dsa_zero);
        !          1787: 
        !          1788:     printk("scsi%d : NCR code relocated to 0x%lx (virt 0x%p)\n", host->host_no,
        !          1789:        virt_to_bus(hostdata->script), hostdata->script);
        !          1790: }
        !          1791: 
        !          1792: /*
        !          1793:  * Function : static int NCR53c8xx_run_tests (struct Scsi_Host *host)
        !          1794:  *
        !          1795:  * Purpose : run various verification tests on the NCR chip, 
        !          1796:  *     including interrupt generation, and proper bus mastering
        !          1797:  *     operation.
        !          1798:  * 
        !          1799:  * Inputs : host - a properly initialized Scsi_Host structure
        !          1800:  *
        !          1801:  * Preconditions : the NCR chip must be in a halted state.
        !          1802:  *
        !          1803:  * Returns : 0 if all tests were successful, -1 on error.
        !          1804:  * 
        !          1805:  */
        !          1806: 
        !          1807: static int 
        !          1808: NCR53c8xx_run_tests (struct Scsi_Host *host) {
        !          1809:     NCR53c7x0_local_declare();
        !          1810:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          1811:        host->hostdata;
        !          1812:     unsigned long timeout;
        !          1813:     u32 start;
        !          1814:     int failed, i;
        !          1815:     unsigned long flags;
        !          1816:     NCR53c7x0_local_setup(host);
        !          1817: 
        !          1818:     /* The NCR chip _must_ be idle to run the test scripts */
        !          1819: 
        !          1820:     save_flags(flags);
        !          1821:     cli();
        !          1822:     if (!hostdata->idle) {
        !          1823:        printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
        !          1824:        restore_flags(flags);
        !          1825:        return -1;
        !          1826:     }
        !          1827: 
        !          1828:     /* 
        !          1829:      * Check for functional interrupts, this could work as an
        !          1830:      * autoprobe routine.
        !          1831:      */
        !          1832: 
        !          1833:     if ((hostdata->options & OPTION_DEBUG_TEST1) && 
        !          1834:            hostdata->state != STATE_DISABLED) {
        !          1835:        hostdata->idle = 0;
        !          1836:        hostdata->test_running = 1;
        !          1837:        hostdata->test_completed = -1;
        !          1838:        hostdata->test_dest = 0;
        !          1839:        hostdata->test_source = 0xdeadbeef;
        !          1840:        start = virt_to_bus (hostdata->script) + hostdata->E_test_1;
        !          1841:        hostdata->state = STATE_RUNNING;
        !          1842:        printk ("scsi%d : test 1", host->host_no);
        !          1843:        NCR53c7x0_write32 (DSP_REG, start);
        !          1844:        printk (" started\n");
        !          1845:        sti();
        !          1846: 
        !          1847:        /* 
        !          1848:         * This is currently a .5 second timeout, since (in theory) no slow 
        !          1849:         * board will take that long.  In practice, we've seen one 
        !          1850:         * pentium which ocassionally fails with this, but works with 
        !          1851:         * 10 times as much?
        !          1852:         */
        !          1853: 
        !          1854:        timeout = jiffies + 5 * HZ / 10;
        !          1855:        while ((hostdata->test_completed == -1) && jiffies < timeout)
        !          1856:                barrier();
        !          1857: 
        !          1858:        failed = 1;
        !          1859:        if (hostdata->test_completed == -1)
        !          1860:            printk ("scsi%d : driver test 1 timed out%s\n",host->host_no ,
        !          1861:                (hostdata->test_dest == 0xdeadbeef) ? 
        !          1862:                    " due to lost interrupt.\n"
        !          1863:                    "         Please verify that the correct IRQ is being used for your board,\n"
        !          1864:                    "         and that the motherboard IRQ jumpering matches the PCI setup on\n"
        !          1865:                    "         PCI systems.\n"
        !          1866:                    "         If you are using a NCR53c810 board in a PCI system, you should\n" 
        !          1867:                    "         also verify that the board is jumpered to use PCI INTA, since\n"
        !          1868:                    "         most PCI motherboards lack support for INTB, INTC, and INTD.\n"
        !          1869:                    : "");
        !          1870:        else if (hostdata->test_completed != 1) 
        !          1871:            printk ("scsi%d : test 1 bad interrupt value (%d)\n", 
        !          1872:                host->host_no, hostdata->test_completed);
        !          1873:        else 
        !          1874:            failed = (hostdata->test_dest != 0xdeadbeef);
        !          1875: 
        !          1876:        if (hostdata->test_dest != 0xdeadbeef) {
        !          1877:            printk ("scsi%d : driver test 1 read 0x%x instead of 0xdeadbeef indicating a\n"
        !          1878:                     "         probable cache invalidation problem.  Please configure caching\n"
        !          1879:                    "         as write-through or disabled\n",
        !          1880:                host->host_no, hostdata->test_dest);
        !          1881:        }
        !          1882: 
        !          1883:        if (failed) {
        !          1884:            printk ("scsi%d : DSP = 0x%p (script at 0x%p, start at 0x%x)\n",
        !          1885:                host->host_no, bus_to_virt(NCR53c7x0_read32(DSP_REG)),
        !          1886:                hostdata->script, start);
        !          1887:            printk ("scsi%d : DSPS = 0x%x\n", host->host_no,
        !          1888:                NCR53c7x0_read32(DSPS_REG));
        !          1889:            restore_flags(flags);
        !          1890:            return -1;
        !          1891:        }
        !          1892:        hostdata->test_running = 0;
        !          1893:     }
        !          1894: 
        !          1895:     if ((hostdata->options & OPTION_DEBUG_TEST2) && 
        !          1896:        hostdata->state != STATE_DISABLED) {
        !          1897:        u32 dsa[48];
        !          1898:        unsigned char identify = IDENTIFY(0, 0);
        !          1899:        unsigned char cmd[6];
        !          1900:        unsigned char data[36];
        !          1901:        unsigned char status = 0xff;
        !          1902:        unsigned char msg = 0xff;
        !          1903: 
        !          1904:        cmd[0] = INQUIRY;
        !          1905:        cmd[1] = cmd[2] = cmd[3] = cmd[5] = 0;
        !          1906:        cmd[4] = sizeof(data); 
        !          1907: 
        !          1908:        dsa[2] = 1;
        !          1909:        dsa[3] = virt_to_bus(&identify);
        !          1910:        dsa[4] = 6;
        !          1911:        dsa[5] = virt_to_bus(&cmd);
        !          1912:        dsa[6] = sizeof(data);
        !          1913:        dsa[7] = virt_to_bus(&data);
        !          1914:        dsa[8] = 1;
        !          1915:        dsa[9] = virt_to_bus(&status);
        !          1916:        dsa[10] = 1;
        !          1917:        dsa[11] = virt_to_bus(&msg);
        !          1918: 
        !          1919:        for (i = 0; i < 3; ++i) {
        !          1920:            cli();
        !          1921:            if (!hostdata->idle) {
        !          1922:                printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
        !          1923:                restore_flags(flags);
        !          1924:                return -1;
        !          1925:            }
        !          1926: 
        !          1927:            /*       SCNTL3         SDID        */
        !          1928:            dsa[0] = (0x33 << 24) | (i << 16)  ;
        !          1929:            hostdata->idle = 0;
        !          1930:            hostdata->test_running = 2;
        !          1931:            hostdata->test_completed = -1;
        !          1932:            start = virt_to_bus(hostdata->script) + hostdata->E_test_2;
        !          1933:            hostdata->state = STATE_RUNNING;
        !          1934:            NCR53c7x0_write32 (DSA_REG, virt_to_bus(dsa));
        !          1935:            NCR53c7x0_write32 (DSP_REG, start);
        !          1936:            sti();
        !          1937: 
        !          1938:            timeout = jiffies + 5 * HZ; /* arbitrary */
        !          1939:            while ((hostdata->test_completed == -1) && jiffies < timeout)
        !          1940:                barrier();
        !          1941:            NCR53c7x0_write32 (DSA_REG, 0);
        !          1942: 
        !          1943:            if (hostdata->test_completed == 2) {
        !          1944:                data[35] = 0;
        !          1945:                printk ("scsi%d : test 2 INQUIRY to target %d, lun 0 : %s\n",
        !          1946:                    host->host_no, i, data + 8);
        !          1947:                printk ("scsi%d : status ", host->host_no);
        !          1948:                print_status (status);
        !          1949:                printk ("\nscsi%d : message ", host->host_no);
        !          1950:                print_msg (&msg);
        !          1951:                printk ("\n");
        !          1952:            } else if (hostdata->test_completed == 3) {
        !          1953:                printk("scsi%d : test 2 no connection with target %d\n",
        !          1954:                    host->host_no, i);
        !          1955:                if (!hostdata->idle) {
        !          1956:                    printk("scsi%d : not idle\n", host->host_no);
        !          1957:                    restore_flags(flags);
        !          1958:                    return -1;
        !          1959:                }
        !          1960:            } else if (hostdata->test_completed == -1) {
        !          1961:                printk ("scsi%d : test 2 timed out\n", host->host_no);
        !          1962:                restore_flags(flags);
        !          1963:                return -1;
        !          1964:            } 
        !          1965:            hostdata->test_running = 0;
        !          1966:        }
        !          1967:     }
        !          1968: 
        !          1969:     restore_flags(flags);
        !          1970:     return 0;
        !          1971: }
        !          1972: 
        !          1973: /*
        !          1974:  * Function : static void NCR53c8xx_dsa_fixup (struct NCR53c7x0_cmd *cmd)
        !          1975:  *
        !          1976:  * Purpose : copy the NCR53c8xx dsa structure into cmd's dsa buffer,
        !          1977:  *     performing all necessary relocation.
        !          1978:  *
        !          1979:  * Inputs : cmd, a NCR53c7x0_cmd structure with a dsa area large
        !          1980:  *     enough to hold the NCR53c8xx dsa.
        !          1981:  */
        !          1982: 
        !          1983: static void 
        !          1984: NCR53c8xx_dsa_fixup (struct NCR53c7x0_cmd *cmd) {
        !          1985:     Scsi_Cmnd *c = cmd->cmd;
        !          1986:     struct Scsi_Host *host = c->host;
        !          1987:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          1988:        host->hostdata;
        !          1989:     int i;
        !          1990: 
        !          1991:     memcpy (cmd->dsa, hostdata->script + (hostdata->E_dsa_code_template / 4),
        !          1992:        hostdata->E_dsa_code_template_end - hostdata->E_dsa_code_template);
        !          1993: 
        !          1994:     /* 
        !          1995:      * Note : within the NCR 'C' code, dsa points to the _start_
        !          1996:      * of the DSA structure, and _not_ the offset of dsa_zero within
        !          1997:      * that structure used to facilitate shorter signed offsets
        !          1998:      * for the 8 bit ALU.
        !          1999:      * 
        !          2000:      * The implications of this are that 
        !          2001:      * 
        !          2002:      * - 32 bit A_dsa_* absolute values require an additional 
        !          2003:      *          dsa_zero added to their value to be correct, since they are 
        !          2004:      *   relative to dsa_zero which is in essentially a separate
        !          2005:      *   space from the code symbols.
        !          2006:      *
        !          2007:      * - All other symbols require no special treatment.
        !          2008:      */
        !          2009: 
        !          2010:     patch_abs_tci_data (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2011:        dsa_temp_lun, c->lun);
        !          2012:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2013:        dsa_temp_addr_next, virt_to_bus(&cmd->dsa_next_addr));
        !          2014:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2015:        dsa_temp_next, virt_to_bus(cmd->dsa) + Ent_dsa_zero -
        !          2016:        Ent_dsa_code_template + A_dsa_next);
        !          2017:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32), 
        !          2018:        dsa_temp_sync, virt_to_bus((void *)hostdata->sync[c->target].script));
        !          2019:     patch_abs_tci_data (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2020:        dsa_temp_target, c->target);
        !          2021:     /* XXX - new pointer stuff */
        !          2022:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2023:        dsa_temp_addr_saved_pointer, virt_to_bus(&cmd->saved_data_pointer));
        !          2024:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2025:        dsa_temp_addr_saved_residual, virt_to_bus(&cmd->saved_residual));
        !          2026:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2027:        dsa_temp_addr_residual, virt_to_bus(&cmd->residual));
        !          2028: 
        !          2029:     /*  XXX - new start stuff */
        !          2030:     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(u32),
        !          2031:        dsa_temp_addr_dsa_value, virt_to_bus(&cmd->dsa_addr));
        !          2032: 
        !          2033: }
        !          2034: 
        !          2035: /* 
        !          2036:  * Function : run_process_issue_queue (void)
        !          2037:  * 
        !          2038:  * Purpose : insure that the coroutine is running and will process our 
        !          2039:  *     request.  process_issue_queue_running is checked/set here (in an 
        !          2040:  *     inline function) rather than in process_issue_queue itself to reduce 
        !          2041:  *     the chances of stack overflow.
        !          2042:  *
        !          2043:  */
        !          2044: 
        !          2045: static volatile int process_issue_queue_running = 0;
        !          2046: 
        !          2047: static __inline__ void 
        !          2048: run_process_issue_queue(void) {
        !          2049:     unsigned long flags;
        !          2050:     save_flags (flags);
        !          2051:     cli();
        !          2052:     if (!process_issue_queue_running) {
        !          2053:        process_issue_queue_running = 1;
        !          2054:         process_issue_queue(flags);
        !          2055:        /* 
        !          2056:          * process_issue_queue_running is cleared in process_issue_queue 
        !          2057:         * once it can't do more work, and process_issue_queue exits with 
        !          2058:         * interrupts disabled.
        !          2059:         */
        !          2060:     }
        !          2061:     restore_flags (flags);
        !          2062: }
        !          2063: 
        !          2064: /*
        !          2065:  * Function : static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int
        !          2066:  *     result)
        !          2067:  *
        !          2068:  * Purpose : mark SCSI command as finished, OR'ing the host portion 
        !          2069:  *     of the result word into the result field of the corresponding
        !          2070:  *     Scsi_Cmnd structure, and removing it from the internal queues.
        !          2071:  *
        !          2072:  * Inputs : cmd - command, result - entire result field
        !          2073:  *
        !          2074:  * Preconditions : the         NCR chip should be in a halted state when 
        !          2075:  *     abnormal_finished is run, since it modifies structures which
        !          2076:  *     the NCR expects to have exclusive access to.
        !          2077:  */
        !          2078: 
        !          2079: static void 
        !          2080: abnormal_finished (struct NCR53c7x0_cmd *cmd, int result) {
        !          2081:     Scsi_Cmnd *c = cmd->cmd;
        !          2082:     struct Scsi_Host *host = c->host;
        !          2083:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          2084:        host->hostdata;
        !          2085:     unsigned long flags;
        !          2086:     int left, found;
        !          2087:     volatile struct NCR53c7x0_cmd * linux_search;
        !          2088:     volatile struct NCR53c7x0_cmd * volatile *linux_prev;
        !          2089:     volatile u32 *ncr_prev, *current, ncr_search;
        !          2090: 
        !          2091: #if 0
        !          2092:     printk ("scsi%d: abnormal finished\n", host->host_no);
        !          2093: #endif
        !          2094: 
        !          2095:     save_flags(flags);
        !          2096:     cli();
        !          2097:     found = 0;
        !          2098:     /* 
        !          2099:      * Traverse the NCR issue array until we find a match or run out 
        !          2100:      * of instructions.  Instructions in the NCR issue array are 
        !          2101:      * either JUMP or NOP instructions, which are 2 words in length.
        !          2102:      */
        !          2103: 
        !          2104: 
        !          2105:     for (found = 0, left = host->can_queue, current = hostdata->schedule; 
        !          2106:        left > 0; --left, current += 2)
        !          2107:     {
        !          2108:        if (issue_to_cmd (host, hostdata, (u32 *) current) == cmd) 
        !          2109:        {
        !          2110:            current[0] = hostdata->NOP_insn;
        !          2111:            current[1] = 0xdeadbeef;
        !          2112:            ++found;
        !          2113:            break;
        !          2114:        }
        !          2115:     }
        !          2116:        
        !          2117:     /* 
        !          2118:      * Traverse the NCR reconnect list of DSA structures until we find 
        !          2119:      * a pointer to this dsa or have found too many command structures.  
        !          2120:      * We let prev point at the next field of the previous element or 
        !          2121:      * head of the list, so we don't do anything different for removing 
        !          2122:      * the head element.  
        !          2123:      */
        !          2124: 
        !          2125:     for (left = host->can_queue,
        !          2126:            ncr_search = hostdata->reconnect_dsa_head, 
        !          2127:            ncr_prev = &hostdata->reconnect_dsa_head;
        !          2128:        left >= 0 && ncr_search && 
        !          2129:            ((char*)bus_to_virt(ncr_search) + hostdata->dsa_start) 
        !          2130:                != (char *) cmd->dsa;
        !          2131:        ncr_prev = (u32*) ((char*)bus_to_virt(ncr_search) + 
        !          2132:            hostdata->dsa_next), ncr_search = *ncr_prev, --left);
        !          2133: 
        !          2134:     if (left < 0) 
        !          2135:        printk("scsi%d: loop detected in ncr reonncect list\n",
        !          2136:            host->host_no);
        !          2137:     else if (ncr_search) 
        !          2138:        if (found)
        !          2139:            printk("scsi%d: scsi %ld in ncr issue array and reconnect lists\n",
        !          2140:                host->host_no, c->pid);
        !          2141:        else {
        !          2142:            volatile u32 * next = (u32 *) 
        !          2143:                ((char *)bus_to_virt(ncr_search) + hostdata->dsa_next);
        !          2144:            *ncr_prev = *next;
        !          2145: /* If we're at the tail end of the issue queue, update that pointer too. */
        !          2146:            found = 1;
        !          2147:        }
        !          2148: 
        !          2149:     /*
        !          2150:      * Traverse the host running list until we find this command or discover
        !          2151:      * we have too many elements, pointing linux_prev at the next field of the 
        !          2152:      * linux_previous element or head of the list, search at this element.
        !          2153:      */
        !          2154: 
        !          2155:     for (left = host->can_queue, linux_search = hostdata->running_list, 
        !          2156:            linux_prev = &hostdata->running_list;
        !          2157:        left >= 0 && linux_search && linux_search != cmd;
        !          2158:        linux_prev = &(linux_search->next), 
        !          2159:            linux_search = linux_search->next, --left);
        !          2160:     
        !          2161:     if (left < 0) 
        !          2162:        printk ("scsi%d: loop detected in host running list for scsi pid %ld\n",
        !          2163:            host->host_no, c->pid);
        !          2164:     else if (linux_search) {
        !          2165:        *linux_prev = linux_search->next;
        !          2166:        --hostdata->busy[c->target][c->lun];
        !          2167:     }
        !          2168: 
        !          2169:     /* Return the NCR command structure to the free list */
        !          2170:     cmd->next = hostdata->free;
        !          2171:     hostdata->free = cmd;
        !          2172:     c->host_scribble = NULL;
        !          2173: 
        !          2174:     /* And return */
        !          2175:     c->result = result;
        !          2176:     c->scsi_done(c);
        !          2177: 
        !          2178:     restore_flags(flags);
        !          2179:     run_process_issue_queue();
        !          2180: }
        !          2181: 
        !          2182: /* 
        !          2183:  * Function : static void intr_break (struct Scsi_Host *host,
        !          2184:  *     struct NCR53c7x0_cmd *cmd)
        !          2185:  *
        !          2186:  * Purpose :  Handler for breakpoint interrupts from a SCSI script
        !          2187:  *
        !          2188:  * Inputs : host - pointer to this host adapter's structure,
        !          2189:  *     cmd - pointer to the command (if any) dsa was pointing 
        !          2190:  *     to.
        !          2191:  *
        !          2192:  */
        !          2193: 
        !          2194: static void 
        !          2195: intr_break (struct Scsi_Host *host, struct 
        !          2196:     NCR53c7x0_cmd *cmd) {
        !          2197:     NCR53c7x0_local_declare();
        !          2198:     struct NCR53c7x0_break *bp;
        !          2199: #if 0
        !          2200:     Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
        !          2201: #endif
        !          2202:     u32 *dsp;
        !          2203:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          2204:        host->hostdata;         
        !          2205:     unsigned long flags;
        !          2206:     NCR53c7x0_local_setup(host);
        !          2207: 
        !          2208:     /*
        !          2209:      * Find the break point corresponding to this address, and 
        !          2210:      * dump the appropriate debugging information to standard 
        !          2211:      * output.  
        !          2212:      */
        !          2213:     save_flags(flags);
        !          2214:     cli();
        !          2215:     dsp = (u32 *) bus_to_virt(NCR53c7x0_read32(DSP_REG));
        !          2216:     for (bp = hostdata->breakpoints; bp && bp->address != dsp; 
        !          2217:        bp = bp->next);
        !          2218:     if (!bp) 
        !          2219:        panic("scsi%d : break point interrupt from %p with no breakpoint!",
        !          2220:            host->host_no, dsp);
        !          2221: 
        !          2222:     /*
        !          2223:      * Configure the NCR chip for manual start mode, so that we can 
        !          2224:      * point the DSP register at the instruction that follows the 
        !          2225:      * INT int_debug_break instruction.
        !          2226:      */
        !          2227: 
        !          2228:     NCR53c7x0_write8 (hostdata->dmode, 
        !          2229:        NCR53c7x0_read8(hostdata->dmode)|DMODE_MAN);
        !          2230: 
        !          2231:     /*
        !          2232:      * And update the DSP register, using the size of the old 
        !          2233:      * instruction in bytes.
        !          2234:      */
        !          2235: 
        !          2236:     restore_flags(flags);
        !          2237: }
        !          2238: /*
        !          2239:  * Function : static void print_synchronous (const char *prefix, 
        !          2240:  *     const unsigned char *msg)
        !          2241:  * 
        !          2242:  * Purpose : print a pretty, user and machine parsable representation
        !          2243:  *     of a SDTR message, including the "real" parameters, data
        !          2244:  *     clock so we can tell transfer rate at a glance.
        !          2245:  *
        !          2246:  * Inputs ; prefix - text to prepend, msg - SDTR message (5 bytes)
        !          2247:  */
        !          2248: 
        !          2249: static void
        !          2250: print_synchronous (const char *prefix, const unsigned char *msg) {
        !          2251:     if (msg[4]) {
        !          2252:        int Hz = 1000000000 / (msg[3] * 4);
        !          2253:        int integer = Hz / 1000000;
        !          2254:        int fraction = (Hz - (integer * 1000000)) / 10000;
        !          2255:        printk ("%speriod %dns offset %d %d.%02dMHz %s SCSI%s\n",
        !          2256:            prefix, (int) msg[3] * 4, (int) msg[4], integer, fraction,
        !          2257:            (((msg[3] * 4) < 200) ? "FAST" : "synchronous"),
        !          2258:            (((msg[3] * 4) < 200) ? "-II" : ""));
        !          2259:     } else 
        !          2260:        printk ("%sasynchronous SCSI\n", prefix);
        !          2261: }
        !          2262: 
        !          2263: /*
        !          2264:  * Function : static void set_synchronous (struct Scsi_Host *host, 
        !          2265:  *             int target, int sxfer, int scntl3, int now_connected)
        !          2266:  *
        !          2267:  * Purpose : reprogram transfers between the selected SCSI initiator and 
        !          2268:  *     target with the given register values; in the indirect
        !          2269:  *     select operand, reselection script, and chip registers.
        !          2270:  *
        !          2271:  * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
        !          2272:  *     sxfer and scntl3 - NCR registers. now_connected - if non-zero, 
        !          2273:  *     we should reprogram the registers now too.
        !          2274:  */
        !          2275: 
        !          2276: static void
        !          2277: set_synchronous (struct Scsi_Host *host, int target, int sxfer, int scntl3,
        !          2278:     int now_connected) {
        !          2279:     NCR53c7x0_local_declare();
        !          2280:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *) 
        !          2281:        host->hostdata;
        !          2282:     u32 *script;
        !          2283:     NCR53c7x0_local_setup(host);
        !          2284: 
        !          2285:     /* These are eight bit registers */
        !          2286:     sxfer &= 0xff;
        !          2287:     scntl3 &= 0xff;
        !          2288: 
        !          2289:     hostdata->sync[target].sxfer_sanity = sxfer;
        !          2290:     hostdata->sync[target].scntl3_sanity = scntl3;
        !          2291: 
        !          2292: /* 
        !          2293:  * HARD CODED : synchronous script is EIGHT words long.  This 
        !          2294:  * must agree with 53c7.8xx.h
        !          2295:  */
        !          2296: 
        !          2297:     if ((hostdata->chip != 700) && (hostdata->chip != 70066)) {
        !          2298:        hostdata->sync[target].select_indirect = (scntl3 << 24) | 
        !          2299:            (target << 16) | (sxfer << 8);
        !          2300: 
        !          2301:        script = (u32 *) hostdata->sync[target].script;
        !          2302: 
        !          2303:        /* XXX - add NCR53c7x0 code to reprogram SCF bits if we want to */
        !          2304:        if ((hostdata->chip / 100) == 8) {
        !          2305:            script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
        !          2306:                DCMD_RWRI_OP_MOVE) << 24) |
        !          2307:                (SCNTL3_REG_800 << 16) | (scntl3 << 8);
        !          2308:            script[1] = 0;
        !          2309:            script += 2;
        !          2310:        }
        !          2311: 
        !          2312:        script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
        !          2313:            DCMD_RWRI_OP_MOVE) << 24) |
        !          2314:                (SXFER_REG << 16) | (sxfer << 8);
        !          2315:        script[1] = 0;
        !          2316:        script += 2;
        !          2317: 
        !          2318: #ifdef DEBUG_SYNC_INTR
        !          2319:        if (hostdata->options & OPTION_DEBUG_DISCONNECT) {
        !          2320:            script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_INT) << 24) | DBC_TCI_TRUE;
        !          2321:            script[1] = DEBUG_SYNC_INTR;
        !          2322:            script += 2;
        !          2323:        }
        !          2324: #endif
        !          2325: 
        !          2326:        script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_RETURN) << 24) | DBC_TCI_TRUE;
        !          2327:        script[1] = 0;
        !          2328:        script += 2;
        !          2329:     }
        !          2330: 
        !          2331:     if (hostdata->options & OPTION_DEBUG_SYNCHRONOUS) 
        !          2332:        printk ("scsi%d : target %d sync parameters are sxfer=0x%x, scntl3=0x%x\n",
        !          2333:        host->host_no, target, sxfer, scntl3);
        !          2334: 
        !          2335:     if (now_connected) {
        !          2336:        if ((hostdata->chip / 100) == 8) 
        !          2337:            NCR53c7x0_write8(SCNTL3_REG_800, scntl3);
        !          2338:        NCR53c7x0_write8(SXFER_REG, sxfer);
        !          2339:     }
        !          2340: }
        !          2341: 
        !          2342: 
        !          2343: /*
        !          2344:  * Function : static int asynchronous (struct Scsi_Host *host, int target)
        !          2345:  *
        !          2346:  * Purpose : reprogram between the selected SCSI Host adapter and target 
        !          2347:  *      (assumed to be currently connected) for asynchronous transfers.
        !          2348:  *
        !          2349:  * Inputs : host - SCSI host structure, target - numeric target ID.
        !          2350:  *
        !          2351:  * Preconditions : the NCR chip should be in one of the halted states
        !          2352:  */
        !          2353:     
        !          2354: static void
        !          2355: asynchronous (struct Scsi_Host *host, int target) {
        !          2356:     NCR53c7x0_local_declare();
        !          2357:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          2358:        host->hostdata;
        !          2359:     NCR53c7x0_local_setup(host);
        !          2360:     set_synchronous (host, target, /* no offset */ 0, hostdata->saved_scntl3,
        !          2361:        1);
        !          2362:     printk ("scsi%d : setting target %d to asynchronous SCSI\n",
        !          2363:        host->host_no, target);
        !          2364: }
        !          2365: 
        !          2366: /* 
        !          2367:  * XXX - do we want to go out of our way (ie, add extra code to selection
        !          2368:  *     in the NCR53c710/NCR53c720 script) to reprogram the synchronous
        !          2369:  *     conversion bits, or can we be content in just setting the 
        !          2370:  *     sxfer bits?
        !          2371:  */
        !          2372: 
        !          2373: /* Table for NCR53c8xx synchronous values */
        !          2374: static const struct {
        !          2375:     int div;           /* Total clock divisor * 10 */
        !          2376:     unsigned char scf; /* */
        !          2377:     unsigned char tp;  /* 4 + tp = xferp divisor */
        !          2378: } syncs[] = {
        !          2379: /*     div     scf     tp      div     scf     tp      div     scf     tp */
        !          2380:     {  40,     1,      0}, {   50,     1,      1}, {   60,     1,      2}, 
        !          2381:     {  70,     1,      3}, {   75,     2,      1}, {   80,     1,      4},
        !          2382:     {  90,     1,      5}, {   100,    1,      6}, {   105,    2,      3},
        !          2383:     {  110,    1,      7}, {   120,    2,      4}, {   135,    2,      5},
        !          2384:     {  140,    3,      3}, {   150,    2,      6}, {   160,    3,      4},
        !          2385:     {  165,    2,      7}, {   180,    3,      5}, {   200,    3,      6},
        !          2386:     {  210,    4,      3}, {   220,    3,      7}, {   240,    4,      4},
        !          2387:     {  270,    4,      5}, {   300,    4,      6}, {   330,    4,      7}
        !          2388: };
        !          2389: 
        !          2390: /*
        !          2391:  * Function : static void synchronous (struct Scsi_Host *host, int target, 
        !          2392:  *     char *msg)
        !          2393:  *
        !          2394:  * Purpose : reprogram transfers between the selected SCSI initiator and 
        !          2395:  *     target for synchronous SCSI transfers such that the synchronous 
        !          2396:  *     offset is less than that requested and period at least as long 
        !          2397:  *     as that requested.  Also modify *msg such that it contains 
        !          2398:  *     an appropriate response. 
        !          2399:  *
        !          2400:  * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
        !          2401:  *     msg - synchronous transfer request.
        !          2402:  */
        !          2403: 
        !          2404: 
        !          2405: static void 
        !          2406: synchronous (struct Scsi_Host *host, int target, char *msg) {
        !          2407:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          2408:        host->hostdata;
        !          2409:     int desire, divisor, i, limit;
        !          2410:     unsigned char scntl3, sxfer;
        !          2411: /* The diagnostic message fits on one line, even with max. width integers */
        !          2412:     char buf[80];      
        !          2413:    
        !          2414: /* Desired transfer clock in Hz */
        !          2415:     desire = 1000000000L / (msg[3] * 4);
        !          2416: /* Scale the available SCSI clock by 10 so we get tenths */
        !          2417:     divisor = (hostdata->scsi_clock * 10) / desire;
        !          2418: 
        !          2419: /* NCR chips can handle at most an offset of 8 */
        !          2420:     if (msg[4] > 8)
        !          2421:        msg[4] = 8;
        !          2422: 
        !          2423:     if (hostdata->options & OPTION_DEBUG_SDTR)
        !          2424:        printk("scsi%d : optimal synchronous divisor of %d.%01d\n", 
        !          2425:            host->host_no, divisor / 10, divisor % 10);
        !          2426: 
        !          2427:     limit = (sizeof(syncs) / sizeof(syncs[0]) -1);
        !          2428:     for (i = 0; (i < limit) && (divisor > syncs[i].div); ++i);
        !          2429: 
        !          2430:     if (hostdata->options & OPTION_DEBUG_SDTR)
        !          2431:        printk("scsi%d : selected synchronous divisor of %d.%01d\n", 
        !          2432:            host->host_no, syncs[i].div / 10, syncs[i].div % 10);
        !          2433: 
        !          2434:     msg[3] = ((1000000000L / hostdata->scsi_clock) * syncs[i].div / 10 / 4);
        !          2435: 
        !          2436:     if (hostdata->options & OPTION_DEBUG_SDTR)
        !          2437:        printk("scsi%d : selected synchronous period of %dns\n", host->host_no,
        !          2438:            msg[3] * 4);
        !          2439: 
        !          2440:     scntl3 = (hostdata->chip / 100 == 8) ? ((hostdata->saved_scntl3 & 
        !          2441:        ~SCNTL3_800_SCF_MASK) | (syncs[i].scf << SCNTL3_800_SCF_SHIFT)) : 0;
        !          2442:     sxfer = (msg[4] << SXFER_MO_SHIFT) | ((syncs[i].tp) << SXFER_TP_SHIFT);
        !          2443:     if (hostdata->options & OPTION_DEBUG_SDTR)
        !          2444:        printk ("scsi%d : sxfer=0x%x scntl3=0x%x\n", 
        !          2445:            host->host_no, (int) sxfer, (int) scntl3);
        !          2446:     set_synchronous (host, target, sxfer, scntl3, 1);
        !          2447:     sprintf (buf, "scsi%d : setting target %d to ", host->host_no, target);
        !          2448:     print_synchronous (buf, msg);
        !          2449: }
        !          2450: 
        !          2451: /* 
        !          2452:  * Function : static int NCR53c8x0_dstat_sir_intr (struct Scsi_Host *host,
        !          2453:  *     struct NCR53c7x0_cmd *cmd)
        !          2454:  *
        !          2455:  * Purpose :  Handler for INT generated instructions for the 
        !          2456:  *     NCR53c810/820 SCSI SCRIPT
        !          2457:  *
        !          2458:  * Inputs : host - pointer to this host adapter's structure,
        !          2459:  *     cmd - pointer to the command (if any) dsa was pointing 
        !          2460:  *     to.
        !          2461:  *
        !          2462:  */
        !          2463: 
        !          2464: static int 
        !          2465: NCR53c8x0_dstat_sir_intr (struct Scsi_Host *host, struct 
        !          2466:     NCR53c7x0_cmd *cmd) {
        !          2467:     NCR53c7x0_local_declare();
        !          2468:     int print;
        !          2469:     Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
        !          2470:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          2471:        host->hostdata;         
        !          2472:     u32 dsps,*dsp;     /* Argument of the INT instruction */
        !          2473:     NCR53c7x0_local_setup(host);
        !          2474:     dsps = NCR53c7x0_read32(DSPS_REG);
        !          2475:     dsp = (u32 *) bus_to_virt(NCR53c7x0_read32(DSP_REG));
        !          2476: 
        !          2477:     if (hostdata->options & OPTION_DEBUG_INTR) 
        !          2478:        printk ("scsi%d : DSPS = 0x%x\n", host->host_no, dsps);
        !          2479: 
        !          2480:     switch (dsps) {
        !          2481:     case A_int_msg_1:
        !          2482:        print = 1;
        !          2483:        switch (hostdata->msg_buf[0]) {
        !          2484:        /* 
        !          2485:         * Unless we've initiated synchronous negotiation, I don't
        !          2486:         * think that this should happen.
        !          2487:         */
        !          2488:        case MESSAGE_REJECT:
        !          2489:            hostdata->dsp = hostdata->script + hostdata->E_accept_message /
        !          2490:                sizeof(u32);
        !          2491:            hostdata->dsp_changed = 1;
        !          2492:            if (cmd && (cmd->flags & CMD_FLAG_SDTR)) {
        !          2493:                printk ("scsi%d : target %d rejected SDTR\n", host->host_no, 
        !          2494:                    c->target);
        !          2495:                cmd->flags &= ~CMD_FLAG_SDTR;
        !          2496:                asynchronous (host, c->target);
        !          2497:                print = 0;
        !          2498:            } 
        !          2499:            break;
        !          2500:        case INITIATE_RECOVERY:
        !          2501:            printk ("scsi%d : extended contingent allegiance not supported yet, rejecting\n",
        !          2502:                host->host_no);
        !          2503:            /* Fall through to default */
        !          2504:            hostdata->dsp = hostdata->script + hostdata->E_reject_message /
        !          2505:                sizeof(u32);
        !          2506:            hostdata->dsp_changed = 1;
        !          2507:            break;
        !          2508:        default:
        !          2509:            printk ("scsi%d : unsupported message, resjecting\n",
        !          2510:                host->host_no);
        !          2511:            hostdata->dsp = hostdata->script + hostdata->E_reject_message /
        !          2512:                sizeof(u32);
        !          2513:            hostdata->dsp_changed = 1;
        !          2514:        }
        !          2515:        if (print) {
        !          2516:            printk ("scsi%d : received message", host->host_no);
        !          2517:            if (c) 
        !          2518:                printk (" from target %d lun %d ", c->target, c->lun);
        !          2519:            print_msg ((unsigned char *) hostdata->msg_buf);
        !          2520:            printk("\n");
        !          2521:        }
        !          2522:        
        !          2523:        return SPECIFIC_INT_NOTHING;
        !          2524: 
        !          2525: 
        !          2526:     case A_int_msg_sdtr:
        !          2527: /*
        !          2528:  * At this point, hostdata->msg_buf contains
        !          2529:  * 0 EXTENDED MESSAGE
        !          2530:  * 1 length 
        !          2531:  * 2 SDTR
        !          2532:  * 3 period * 4ns
        !          2533:  * 4 offset
        !          2534:  */
        !          2535: 
        !          2536:        if (cmd) {
        !          2537:            char buf[80];
        !          2538:            sprintf (buf, "scsi%d : target %d %s ", host->host_no, c->target,
        !          2539:                (cmd->flags & CMD_FLAG_SDTR) ? "accepting" : "requesting");
        !          2540:            print_synchronous (buf, (unsigned char *) hostdata->msg_buf);
        !          2541: 
        !          2542:        /* 
        !          2543:         * Initiator initiated, won't happen unless synchronous 
        !          2544:         *      transfers are enabled.  If we get a SDTR message in
        !          2545:         *      response to our SDTR, we should program our parameters
        !          2546:         *      such that 
        !          2547:         *              offset <= requested offset
        !          2548:         *              period >= requested period                      
        !          2549:         */
        !          2550:            if (cmd->flags & CMD_FLAG_SDTR) {
        !          2551:                cmd->flags &= ~CMD_FLAG_SDTR; 
        !          2552:                if (hostdata->msg_buf[4]) 
        !          2553:                    synchronous (host, c->target, (unsigned char *) 
        !          2554:                        hostdata->msg_buf);
        !          2555:                else 
        !          2556:                    asynchronous (host, c->target);
        !          2557:                hostdata->dsp = hostdata->script + hostdata->E_accept_message /
        !          2558:                    sizeof(u32);
        !          2559:                hostdata->dsp_changed = 1;
        !          2560:                return SPECIFIC_INT_NOTHING;
        !          2561:            } else {
        !          2562:                if (hostdata->options & OPTION_SYNCHRONOUS)  {
        !          2563:                    cmd->flags |= CMD_FLAG_DID_SDTR;
        !          2564:                    synchronous (host, c->target, (unsigned char *) 
        !          2565:                        hostdata->msg_buf);
        !          2566:                } else {
        !          2567:                    hostdata->msg_buf[4] = 0;           /* 0 offset = async */
        !          2568:                    asynchronous (host, c->target);
        !          2569:                }
        !          2570:                patch_dsa_32 (cmd->dsa, dsa_msgout_other, 0, 5);
        !          2571:                patch_dsa_32 (cmd->dsa, dsa_msgout_other, 1, (u32) 
        !          2572:                    virt_to_bus ((void *)&hostdata->msg_buf));
        !          2573:                hostdata->dsp = hostdata->script + 
        !          2574:                    hostdata->E_respond_message / sizeof(u32);
        !          2575:                hostdata->dsp_changed = 1;
        !          2576:            }
        !          2577:            return SPECIFIC_INT_NOTHING;
        !          2578:        }
        !          2579:        /* Fall through to abort if we couldn't find a cmd, and 
        !          2580:           therefore a dsa structure to twiddle */
        !          2581:     case A_int_msg_wdtr:
        !          2582:        hostdata->dsp = hostdata->script + hostdata->E_reject_message /
        !          2583:            sizeof(u32);
        !          2584:        hostdata->dsp_changed = 1;
        !          2585:        return SPECIFIC_INT_NOTHING;
        !          2586:     case A_int_err_unexpected_phase:
        !          2587:        if (hostdata->options & OPTION_DEBUG_INTR) 
        !          2588:            printk ("scsi%d : unexpected phase\n", host->host_no);
        !          2589:        return SPECIFIC_INT_ABORT;
        !          2590:     case A_int_err_selected:
        !          2591:        printk ("scsi%d : selected by target %d\n", host->host_no,
        !          2592:            (int) NCR53c7x0_read8(SDID_REG_800) &7);
        !          2593:        hostdata->dsp = hostdata->script + hostdata->E_target_abort / 
        !          2594:            sizeof(u32);
        !          2595:        hostdata->dsp_changed = 1;
        !          2596:        return SPECIFIC_INT_NOTHING;
        !          2597:     case A_int_err_unexpected_reselect:
        !          2598:        printk ("scsi%d : unexpected reselect by target %d lun %d\n", 
        !          2599:            host->host_no, (int) NCR53c7x0_read8(SDID_REG_800) & 7,
        !          2600:            hostdata->reselected_identify & 7);
        !          2601:        hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
        !          2602:            sizeof(u32);
        !          2603:        hostdata->dsp_changed = 1;
        !          2604:        return SPECIFIC_INT_NOTHING;
        !          2605: /*
        !          2606:  * Since contingent allegiance conditions are cleared by the next 
        !          2607:  * command issued to a target, we must issue a REQUEST SENSE 
        !          2608:  * command after receiving a CHECK CONDITION status, before
        !          2609:  * another command is issued.
        !          2610:  * 
        !          2611:  * Since this NCR53c7x0_cmd will be freed after use, we don't 
        !          2612:  * care if we step on the various fields, so modify a few things.
        !          2613:  */
        !          2614:     case A_int_err_check_condition: 
        !          2615: #if 0
        !          2616:        if (hostdata->options & OPTION_DEBUG_INTR) 
        !          2617: #endif
        !          2618:            printk ("scsi%d : CHECK CONDITION\n", host->host_no);
        !          2619:        if (!c) {
        !          2620:            printk("scsi%d : CHECK CONDITION with no SCSI command\n",
        !          2621:                host->host_no);
        !          2622:            return SPECIFIC_INT_PANIC;
        !          2623:        }
        !          2624: 
        !          2625:        /* 
        !          2626:         * FIXME : this uses the normal one-byte selection message.
        !          2627:         *      We may want to renegotiate for synchronous & WIDE transfers
        !          2628:         *      since these could be the crux of our problem.
        !          2629:         *
        !          2630:         hostdata->NOP_insn* FIXME : once SCSI-II tagged queuing is implemented, we'll
        !          2631:         *      have to set this up so that the rest of the DSA
        !          2632:         *      agrees with this being an untagged queue'd command.
        !          2633:         */
        !          2634: 
        !          2635:        patch_dsa_32 (cmd->dsa, dsa_msgout, 0, 1);
        !          2636: 
        !          2637:        /* 
        !          2638:         * Modify the table indirect for COMMAND OUT phase, since 
        !          2639:         * Request Sense is a six byte command.
        !          2640:         */
        !          2641: 
        !          2642:        patch_dsa_32 (cmd->dsa, dsa_cmdout, 0, 6);
        !          2643: 
        !          2644:        c->cmnd[0] = REQUEST_SENSE;
        !          2645:        c->cmnd[1] &= 0xe0;     /* Zero all but LUN */
        !          2646:        c->cmnd[2] = 0;
        !          2647:        c->cmnd[3] = 0;
        !          2648:        c->cmnd[4] = sizeof(c->sense_buffer);
        !          2649:        c->cmnd[5] = 0; 
        !          2650: 
        !          2651:        /*
        !          2652:         * Disable dataout phase, and program datain to transfer to the 
        !          2653:         * sense buffer, and add a jump to other_transfer after the 
        !          2654:         * command so overflow/underrun conditions are detected.
        !          2655:         */
        !          2656: 
        !          2657:        patch_dsa_32 (cmd->dsa, dsa_dataout, 0, 
        !          2658:            virt_to_bus(hostdata->script) + hostdata->E_other_transfer);
        !          2659:        patch_dsa_32 (cmd->dsa, dsa_datain, 0, 
        !          2660:            virt_to_bus(cmd->data_transfer_start));
        !          2661:        cmd->data_transfer_start[0] = (((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I | 
        !          2662:            DCMD_BMI_IO)) << 24) | sizeof(c->sense_buffer);
        !          2663:        cmd->data_transfer_start[1] = (u32) virt_to_bus(c->sense_buffer);
        !          2664: 
        !          2665:        cmd->data_transfer_start[2] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) 
        !          2666:            << 24) | DBC_TCI_TRUE;
        !          2667:        cmd->data_transfer_start[3] = (u32) virt_to_bus(hostdata->script) + 
        !          2668:            hostdata->E_other_transfer;
        !          2669: 
        !          2670:        /*
        !          2671:         * Currently, this command is flagged as completed, ie 
        !          2672:         * it has valid status and message data.  Reflag it as
        !          2673:         * incomplete.  Q - need to do something so that original
        !          2674:         * status, etc are used.
        !          2675:         */
        !          2676: 
        !          2677:        cmd->cmd->result = 0xffff;              
        !          2678: 
        !          2679:        /* 
        !          2680:         * Restart command as a REQUEST SENSE.
        !          2681:         */
        !          2682:        hostdata->dsp = (u32 *) hostdata->script + hostdata->E_select /
        !          2683:            sizeof(u32);
        !          2684:        hostdata->dsp_changed = 1;
        !          2685:        return SPECIFIC_INT_NOTHING;
        !          2686:     case A_int_debug_break:
        !          2687:        return SPECIFIC_INT_BREAK;
        !          2688:     case A_int_norm_aborted:
        !          2689:        hostdata->dsp = (u32 *) hostdata->schedule;
        !          2690:        hostdata->dsp_changed = 1;
        !          2691:        if (cmd)
        !          2692:            abnormal_finished (cmd, DID_ERROR << 16);
        !          2693:        return SPECIFIC_INT_NOTHING;
        !          2694:     case A_int_test_1:
        !          2695:     case A_int_test_2:
        !          2696:        hostdata->idle = 1;
        !          2697:        hostdata->test_completed = (dsps - A_int_test_1) / 0x00010000 + 1;
        !          2698:        if (hostdata->options & OPTION_DEBUG_INTR)
        !          2699:            printk("scsi%d : test%d complete\n", host->host_no,
        !          2700:                hostdata->test_completed);
        !          2701:        return SPECIFIC_INT_NOTHING;
        !          2702: #ifdef A_int_debug_reselected_ok
        !          2703:     case A_int_debug_reselected_ok:
        !          2704:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2705:                OPTION_DEBUG_DISCONNECT)) {
        !          2706:            /* 
        !          2707:             * Note - this dsa is not based on location relative to 
        !          2708:             * the command structure, but to location relative to the 
        !          2709:             * DSA register 
        !          2710:             */ 
        !          2711:            u32 *dsa;
        !          2712:            dsa = (u32 *) bus_to_virt (NCR53c7x0_read32(DSA_REG));
        !          2713: 
        !          2714:            printk("scsi%d : reselected_ok (DSA = 0x%x (virt 0x%p)\n", 
        !          2715:                host->host_no, NCR53c7x0_read32(DSA_REG), dsa);
        !          2716:            printk("scsi%d : resume address is 0x%x (virt 0x%p)\n",
        !          2717:                    host->host_no, cmd->saved_data_pointer,
        !          2718:                    bus_to_virt(cmd->saved_data_pointer));
        !          2719:            print_insn (host, hostdata->script + Ent_reselected_ok / 
        !          2720:                    sizeof(u32), "", 1);
        !          2721:            printk ("scsi%d : sxfer=0x%x, scntl3=0x%x\n",
        !          2722:                host->host_no, NCR53c7x0_read8(SXFER_REG),
        !          2723:                NCR53c7x0_read8(SCNTL3_REG_800));
        !          2724:            if (c) {
        !          2725:                print_insn (host, (u32 *) 
        !          2726:                    hostdata->sync[c->target].script, "", 1);
        !          2727:                print_insn (host, (u32 *) 
        !          2728:                    hostdata->sync[c->target].script + 2, "", 1);
        !          2729:            }
        !          2730:        }
        !          2731:        return SPECIFIC_INT_RESTART;
        !          2732: #endif
        !          2733: #ifdef A_int_debug_reselect_check
        !          2734:     case A_int_debug_reselect_check:
        !          2735:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2736:            u32 *dsa;
        !          2737: #if 0
        !          2738:            u32 *code;
        !          2739: #endif
        !          2740:            /* 
        !          2741:             * Note - this dsa is not based on location relative to 
        !          2742:             * the command structure, but to location relative to the 
        !          2743:             * DSA register 
        !          2744:             */ 
        !          2745:            dsa = bus_to_virt (NCR53c7x0_read32(DSA_REG));
        !          2746:            printk("scsi%d : reselected_check_next (DSA = 0x%lx (virt 0x%p))\n",
        !          2747:                host->host_no, virt_to_bus(dsa), dsa);
        !          2748:            if (dsa) {
        !          2749:                printk("scsi%d : resume address is 0x%x (virt 0x%p)\n",
        !          2750:                    host->host_no, cmd->saved_data_pointer,
        !          2751:                    bus_to_virt (cmd->saved_data_pointer));
        !          2752: #if 0
        !          2753:                printk("scsi%d : template code :\n", host->host_no);
        !          2754:                for (code = dsa + (Ent_dsa_code_check_reselect - Ent_dsa_zero) 
        !          2755:                    / sizeof(u32); code < (dsa + Ent_dsa_zero / sizeof(u32)); 
        !          2756:                    code += print_insn (host, code, "", 1));
        !          2757: #endif
        !          2758:            }
        !          2759:            print_insn (host, hostdata->script + Ent_reselected_ok / 
        !          2760:                    sizeof(u32), "", 1);
        !          2761:        }
        !          2762:        return SPECIFIC_INT_RESTART;
        !          2763: #endif
        !          2764: #ifdef A_int_debug_dsa_schedule
        !          2765:     case A_int_debug_dsa_schedule:
        !          2766:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2767:            u32 *dsa;
        !          2768:            /* 
        !          2769:             * Note - this dsa is not based on location relative to 
        !          2770:             * the command structure, but to location relative to the 
        !          2771:             * DSA register 
        !          2772:             */ 
        !          2773:            dsa = (u32 *) bus_to_virt (NCR53c7x0_read32(DSA_REG));
        !          2774:            printk("scsi%d : dsa_schedule (old DSA = 0x%lx (virt 0x%p))\n", 
        !          2775:                host->host_no, virt_to_bus(dsa), dsa);
        !          2776:            if (dsa) 
        !          2777:                printk("scsi%d : resume address is 0x%x (virt 0x%p)\n"
        !          2778:                       "         (temp was 0x%x (virt 0x%p))\n",
        !          2779:                    host->host_no, cmd->saved_data_pointer,
        !          2780:                    bus_to_virt (cmd->saved_data_pointer),
        !          2781:                    NCR53c7x0_read32 (TEMP_REG),
        !          2782:                    bus_to_virt (NCR53c7x0_read32(TEMP_REG)));
        !          2783:        }
        !          2784:        return SPECIFIC_INT_RESTART;
        !          2785: #endif
        !          2786: #ifdef A_int_debug_scheduled
        !          2787:     case A_int_debug_scheduled:
        !          2788:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2789:            printk("scsi%d : new I/O 0x%x (virt 0x%p) scheduled\n", 
        !          2790:                host->host_no, NCR53c7x0_read32(DSA_REG),
        !          2791:                bus_to_virt(NCR53c7x0_read32(DSA_REG)));
        !          2792:        }
        !          2793:        return SPECIFIC_INT_RESTART;
        !          2794: #endif
        !          2795: #ifdef A_int_debug_idle
        !          2796:     case A_int_debug_idle:
        !          2797:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2798:            printk("scsi%d : idle\n", host->host_no);
        !          2799:        }
        !          2800:        return SPECIFIC_INT_RESTART;
        !          2801: #endif
        !          2802: #ifdef A_int_debug_cmd
        !          2803:     case A_int_debug_cmd:
        !          2804:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2805:            printk("scsi%d : command sent\n");
        !          2806:        }
        !          2807:        return SPECIFIC_INT_RESTART;
        !          2808: #endif
        !          2809: #ifdef A_int_debug_dsa_loaded
        !          2810:     case A_int_debug_dsa_loaded:
        !          2811:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2812:            printk("scsi%d : DSA loaded with 0x%x (virt 0x%p)\n", host->host_no,
        !          2813:                NCR53c7x0_read32(DSA_REG), 
        !          2814:                bus_to_virt(NCR53c7x0_read32(DSA_REG)));
        !          2815:        }
        !          2816:        return SPECIFIC_INT_RESTART; 
        !          2817: #endif
        !          2818: #ifdef A_int_debug_reselected
        !          2819:     case A_int_debug_reselected:
        !          2820:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2821:            OPTION_DEBUG_DISCONNECT)) {
        !          2822:            printk("scsi%d : reselected by target %d lun %d\n",
        !          2823:                host->host_no, (int) NCR53c7x0_read8(SDID_REG_800) & ~0x80, 
        !          2824:                (int) hostdata->reselected_identify & 7);
        !          2825:            print_queues(host);
        !          2826:        }
        !          2827:        return SPECIFIC_INT_RESTART;
        !          2828: #endif
        !          2829: #ifdef A_int_debug_disconnect_msg
        !          2830:     case A_int_debug_disconnect_msg:
        !          2831:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
        !          2832:            if (c)
        !          2833:                printk("scsi%d : target %d lun %d disconnecting\n", 
        !          2834:                    host->host_no, c->target, c->lun);
        !          2835:            else
        !          2836:                printk("scsi%d : unknown target disconnecting\n",
        !          2837:                    host->host_no);
        !          2838:        }
        !          2839:        return SPECIFIC_INT_RESTART;
        !          2840: #endif
        !          2841: #ifdef A_int_debug_disconnected
        !          2842:     case A_int_debug_disconnected:
        !          2843:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2844:                OPTION_DEBUG_DISCONNECT)) {
        !          2845:            printk ("scsi%d : disconnected, new queues are\n", 
        !          2846:                host->host_no);
        !          2847:            print_queues(host);
        !          2848: #if 0
        !          2849:            printk ("scsi%d : sxfer=0x%x, scntl3=0x%x\n",
        !          2850:                host->host_no, NCR53c7x0_read8(SXFER_REG),
        !          2851:                NCR53c7x0_read8(SCNTL3_REG_800));
        !          2852: #endif
        !          2853:            if (c) {
        !          2854:                print_insn (host, (u32 *) 
        !          2855:                    hostdata->sync[c->target].script, "", 1);
        !          2856:                print_insn (host, (u32 *) 
        !          2857:                    hostdata->sync[c->target].script + 2, "", 1);
        !          2858:            }
        !          2859:        }
        !          2860:        return SPECIFIC_INT_RESTART;
        !          2861: #endif
        !          2862: #ifdef A_int_debug_panic
        !          2863:     case A_int_debug_panic:
        !          2864:        printk("scsi%d : int_debug_panic received\n", host->host_no);
        !          2865:        print_lots (host);
        !          2866:        return SPECIFIC_INT_PANIC;
        !          2867: #endif
        !          2868: #ifdef A_int_debug_saved
        !          2869:     case A_int_debug_saved:
        !          2870:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2871:            OPTION_DEBUG_DISCONNECT)) {
        !          2872:            printk ("scsi%d : saved data pointer 0x%x (virt 0x%p)\n",
        !          2873:                host->host_no, cmd->saved_data_pointer,
        !          2874:                bus_to_virt (cmd->saved_data_pointer));
        !          2875:            print_progress (c);
        !          2876:        }
        !          2877:        return SPECIFIC_INT_RESTART;
        !          2878: #endif
        !          2879: #ifdef A_int_debug_restored
        !          2880:     case A_int_debug_restored:
        !          2881:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2882:            OPTION_DEBUG_DISCONNECT)) {
        !          2883:            if (cmd) {
        !          2884:                int size;
        !          2885:                printk ("scsi%d : restored data pointer 0x%x (virt 0x%p)\n",
        !          2886:                    host->host_no, cmd->saved_data_pointer, bus_to_virt (
        !          2887:                    cmd->saved_data_pointer));
        !          2888:                size = print_insn (host, (u32 *) 
        !          2889:                    bus_to_virt(cmd->saved_data_pointer), "", 1);
        !          2890:                size = print_insn (host, (u32 *) 
        !          2891:                    bus_to_virt(cmd->saved_data_pointer) + size, "", 1);
        !          2892:                print_progress (c);
        !          2893:            }
        !          2894: #if 0
        !          2895:            printk ("scsi%d : datapath residual %d\n",
        !          2896:                host->host_no, datapath_residual (host)) ;
        !          2897: #endif
        !          2898:        }
        !          2899:        return SPECIFIC_INT_RESTART;
        !          2900: #endif
        !          2901: #ifdef A_int_debug_sync
        !          2902:     case A_int_debug_sync:
        !          2903:        if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2904:            OPTION_DEBUG_DISCONNECT|OPTION_DEBUG_SDTR)) {
        !          2905:            unsigned char sxfer = NCR53c7x0_read8 (SXFER_REG),
        !          2906:                scntl3 = NCR53c7x0_read8 (SCNTL3_REG_800);
        !          2907:            if (c) {
        !          2908:                if (sxfer != hostdata->sync[c->target].sxfer_sanity ||
        !          2909:                    scntl3 != hostdata->sync[c->target].scntl3_sanity) {
        !          2910:                        printk ("scsi%d :  sync sanity check failed sxfer=0x%x, scntl3=0x%x",
        !          2911:                            host->host_no, sxfer, scntl3);
        !          2912:                        NCR53c7x0_write8 (SXFER_REG, sxfer);
        !          2913:                        NCR53c7x0_write8 (SCNTL3_REG_800, scntl3);
        !          2914:                    }
        !          2915:            } else 
        !          2916:                printk ("scsi%d : unknown command sxfer=0x%x, scntl3=0x%x\n",
        !          2917:                    host->host_no, (int) sxfer, (int) scntl3);
        !          2918:        }
        !          2919:        return SPECIFIC_INT_RESTART;
        !          2920: #endif
        !          2921: #ifdef A_int_debug_datain
        !          2922:        case A_int_debug_datain:
        !          2923:            if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR|
        !          2924:                OPTION_DEBUG_DISCONNECT|OPTION_DEBUG_SDTR)) {
        !          2925:                int size;
        !          2926:                printk ("scsi%d : In do_datain (%s) sxfer=0x%x, scntl3=0x%x\n"
        !          2927:                        "         datapath residual=%d\n",
        !          2928:                    host->host_no, sbcl_to_phase (NCR53c7x0_read8 (SBCL_REG)),
        !          2929:                    (int) NCR53c7x0_read8(SXFER_REG), 
        !          2930:                    (int) NCR53c7x0_read8(SCNTL3_REG_800),
        !          2931:                    datapath_residual (host)) ;
        !          2932:                print_insn (host, dsp, "", 1);
        !          2933:                size = print_insn (host, (u32 *) bus_to_virt(dsp[1]), "", 1);
        !          2934:                print_insn (host, (u32 *) bus_to_virt(dsp[1]) + size, "", 1);
        !          2935:           } 
        !          2936:        return SPECIFIC_INT_RESTART;
        !          2937: #endif
        !          2938: /* 
        !          2939:  * FIXME : for 7xx support, we need to read SDID_REG_700 and handle 
        !          2940:  *     the comparison as bitfielded,  not binary.
        !          2941:  */
        !          2942: #ifdef A_int_debug_check_dsa
        !          2943:        case A_int_debug_check_dsa:
        !          2944:            if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) {
        !          2945:                int sdid = NCR53c7x0_read8 (SDID_REG_800) & 15;
        !          2946:                char *where = dsp - NCR53c7x0_insn_size(NCR53c7x0_read8 
        !          2947:                        (DCMD_REG)) == hostdata->script + 
        !          2948:                        Ent_select_check_dsa / sizeof(u32) ?
        !          2949:                    "selection" : "reselection";
        !          2950:                if (c && sdid != c->target) {
        !          2951:                    printk ("scsi%d : SDID target %d != DSA target %d at %s\n",
        !          2952:                        host->host_no, sdid, c->target, where);
        !          2953:                    print_lots(host);
        !          2954:                    dump_events (host, 20);
        !          2955:                    return SPECIFIC_INT_PANIC;
        !          2956:                }
        !          2957:            }
        !          2958:            return SPECIFIC_INT_RESTART;
        !          2959: #endif
        !          2960:     default:
        !          2961:        if ((dsps & 0xff000000) == 0x03000000) {
        !          2962:             printk ("scsi%d : misc debug interrupt 0x%x\n",
        !          2963:                host->host_no, dsps);
        !          2964:            return SPECIFIC_INT_RESTART;
        !          2965:        } else if ((dsps & 0xff000000) == 0x05000000) {
        !          2966:            if (hostdata->events) {
        !          2967:                struct NCR53c7x0_event *event;
        !          2968:                ++hostdata->event_index;
        !          2969:                if (hostdata->event_index >= hostdata->event_size)
        !          2970:                    hostdata->event_index = 0;
        !          2971:                event = (struct NCR53c7x0_event *) hostdata->events + 
        !          2972:                    hostdata->event_index;
        !          2973:                event->event = (enum ncr_event) dsps;
        !          2974:                event->dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
        !          2975:            /* FIXME : this needs to change for the '7xx family */
        !          2976:                if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON) 
        !          2977:                        event->target = NCR53c7x0_read8(SSID_REG_800);
        !          2978:                else 
        !          2979:                        event->target = 255;
        !          2980: 
        !          2981:                if (event->event == EVENT_RESELECT)
        !          2982:                    event->lun = hostdata->reselected_identify & 0xf;
        !          2983:                else if (c)
        !          2984:                    event->lun = c->lun;
        !          2985:                else
        !          2986:                    event->lun = 255;
        !          2987:                do_gettimeofday(&(event->time));
        !          2988:                if (c) {
        !          2989:                    event->pid = c->pid;
        !          2990:                    memcpy ((void *) event->cmnd, (void *) c->cmnd, 
        !          2991:                        sizeof (event->cmnd));
        !          2992:                } else {
        !          2993:                    event->pid = -1;
        !          2994:                }
        !          2995:            }
        !          2996:            return SPECIFIC_INT_RESTART;
        !          2997:        }
        !          2998: 
        !          2999:        printk ("scsi%d : unknown user interrupt 0x%x\n", 
        !          3000:            host->host_no, (unsigned) dsps);
        !          3001:        return SPECIFIC_INT_PANIC;
        !          3002:     }
        !          3003: }
        !          3004: 
        !          3005: /* 
        !          3006:  * XXX - the stock NCR assembler won't output the scriptu.h file,
        !          3007:  * which undefine's all #define'd CPP symbols from the script.h
        !          3008:  * file, which will create problems if you use multiple scripts
        !          3009:  * with the same  symbol names.
        !          3010:  *
        !          3011:  * If you insist on using NCR's assembler, you could generate
        !          3012:  * scriptu.h from script.h using something like 
        !          3013:  *
        !          3014:  * grep #define script.h | \
        !          3015:  * sed 's/#define[     ][      ]*\([_a-zA-Z][_a-zA-Z0-9]*\).*$/#undefine \1/' \
        !          3016:  * > scriptu.h
        !          3017:  */
        !          3018: 
        !          3019: #include "53c8xx_u.h"
        !          3020: 
        !          3021: /* XXX - add alternate script handling code here */
        !          3022: 
        !          3023: 
        !          3024: #ifdef NCR_DEBUG
        !          3025: /*
        !          3026:  * Debugging without a debugger is no fun. So, I've provided 
        !          3027:  * a debugging interface in the NCR53c7x0 driver.  To avoid
        !          3028:  * kernel cruft, there's just enough here to act as an interface
        !          3029:  * to a user level debugger (aka, GDB).
        !          3030:  *
        !          3031:  *
        !          3032:  * The following restrictions apply to debugger commands : 
        !          3033:  * 1.  The command must be terminated by a newline.
        !          3034:  * 2.  Command length must be less than 80 bytes including the 
        !          3035:  *     newline.
        !          3036:  * 3.  The entire command must be written with one system call.
        !          3037:  */
        !          3038: 
        !          3039: static const char debugger_help = 
        !          3040: "bc <addr>                     - clear breakpoint\n"
        !          3041: "bl                            - list breakpoints\n"
        !          3042: "bs <addr>                     - set breakpoint\n"
        !          3043: "g                             - start\n"                              
        !          3044: "h                             - halt\n"
        !          3045: "?                             - this message\n"
        !          3046: "i                             - info\n"
        !          3047: "mp <addr> <size>              - print memory\n"
        !          3048: "ms <addr> <size> <value>      - store memory\n"
        !          3049: "rp <num> <size>               - print register\n"
        !          3050: "rs <num> <size> <value>       - store register\n"
        !          3051: "s                              - single step\n"       
        !          3052: "tb                            - begin trace \n"
        !          3053: "te                            - end trace\n";
        !          3054: 
        !          3055: /*
        !          3056:  * Whenever we change a break point, we should probably 
        !          3057:  * set the NCR up so that it is in a single step mode.
        !          3058:  */
        !          3059: 
        !          3060: static int debugger_fn_bc (struct Scsi_Host *host, struct debugger_token *token,
        !          3061:     u32 args[]) {
        !          3062:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          3063:        instance->hostdata;
        !          3064:     struct NCR53c7x0_break *bp, **prev;
        !          3065:     unsigned long flags;
        !          3066:     save_flags(flags);
        !          3067:     cli();
        !          3068:     for (bp = (struct NCR53c7x0_break *) instance->breakpoints,
        !          3069:            prev = (struct NCR53c7x0_break **) &instance->breakpoints;
        !          3070:            bp; prev = (struct NCR53c7x0_break **) &(bp->next),
        !          3071:            bp = (struct NCR53c7x0_break *) bp->next);
        !          3072: 
        !          3073:     if (!bp) {
        !          3074:        restore_flags(flags);
        !          3075:        return -EIO;
        !          3076:     }
        !          3077: 
        !          3078:     /* 
        !          3079:      * XXX - we need to insure that the processor is halted 
        !          3080:      * here in order to prevent a race condition.
        !          3081:      */
        !          3082:     
        !          3083:     memcpy ((void *) bp->addr, (void *) bp->old, sizeof(bp->old));
        !          3084:     if (prev)
        !          3085:        *prev = bp->next;
        !          3086: 
        !          3087:     restore_flags(flags);
        !          3088:     return 0;
        !          3089: }
        !          3090: 
        !          3091: 
        !          3092: static int 
        !          3093: debugger_fn_bl (struct Scsi_Host *host, struct debugger_token *token,
        !          3094:     u32 args[]) {
        !          3095:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          3096:        host->hostdata;
        !          3097:     struct NCR53c7x0_break *bp;
        !          3098:     char buf[80];
        !          3099:     size_t len;
        !          3100:     unsigned long flags;
        !          3101:     /* 
        !          3102:      * XXX - we need to insure that the processor is halted 
        !          3103:      * here in order to prevent a race condition.  So, if the 
        !          3104:      * processor isn't halted, print an error message and continue.
        !          3105:      */
        !          3106: 
        !          3107:     sprintf (buf, "scsi%d : bp : warning : processor not halted\b",
        !          3108:        host->host_no);
        !          3109:     debugger_kernel_write (host, buf, strlen(buf));
        !          3110: 
        !          3111:     save_flags(flags);
        !          3112:     cli();
        !          3113:     for (bp = (struct NCR53c7x0_break *) host->breakpoints;
        !          3114:            bp; bp = (struct NCR53c7x0_break *) bp->next); {
        !          3115:            sprintf (buf, "scsi%d : bp : success : at %08x, replaces %08x %08x",
        !          3116:                bp->addr, bp->old[0], bp->old[1]);
        !          3117:            len = strlen(buf);
        !          3118:            if ((bp->old[0] & (DCMD_TYPE_MASK << 24)) ==
        !          3119:                (DCMD_TYPE_MMI << 24)) {
        !          3120:                sprintf(buf + len, "%08x\n", * (u32 *) bp->addr);
        !          3121:            } else {
        !          3122:                sprintf(buf + len, "\n");
        !          3123:            }
        !          3124:            len = strlen(buf);
        !          3125:            debugger_kernel_write (host, buf, len);
        !          3126:     }
        !          3127:     restore_flags(flags);
        !          3128:     return 0;
        !          3129: }
        !          3130: 
        !          3131: static int 
        !          3132: debugger_fn_bs (struct Scsi_Host *host, struct debugger_token *token,
        !          3133:     u32 args[]) {
        !          3134:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          3135:        host->hostdata;
        !          3136:     struct NCR53c7x0_break *bp;
        !          3137:     char buf[80];
        !          3138:     size_t len;
        !          3139:     unsigned long flags;
        !          3140:     save_flags(flags);
        !          3141:     cli();
        !          3142: 
        !          3143:     if (hostdata->state != STATE_HALTED) {
        !          3144:        sprintf (buf, "scsi%d : bs : failure : NCR not halted\n", host->host_no);
        !          3145:        debugger_kernel_write (host, buf, strlen(buf));
        !          3146:        restore_flags(flags);
        !          3147:        return -1;
        !          3148:     }
        !          3149: 
        !          3150:     if (!(bp = kmalloc (sizeof (struct NCR53c7x0_break)))) {
        !          3151:        printk ("scsi%d : kmalloc(%d) of breakpoint structure failed, try again\n",
        !          3152:            host->host_no, sizeof(struct NCR53c7x0_break));
        !          3153:        restore_flags(flags);
        !          3154:        return -1;
        !          3155:     }
        !          3156: 
        !          3157:     bp->address = (u32 *) args[0];
        !          3158:     memcpy ((void *) bp->old_instruction, (void *) bp->address, 8);
        !          3159:     bp->old_size = (((bp->old_instruction[0] >> 24) & DCMD_TYPE_MASK) ==
        !          3160:        DCMD_TYPE_MMI ? 3 : 2;
        !          3161:     bp->next = hostdata->breakpoints;
        !          3162:     hostdata->breakpoints = bp->next;
        !          3163:     memcpy ((void *) bp->address, (void *) hostdata->E_debug_break, 8);
        !          3164:     
        !          3165:     restore_flags(flags);
        !          3166:     return 0;
        !          3167: }
        !          3168: 
        !          3169: #define TOKEN(name,nargs) {#name, nargs, debugger_fn_##name}
        !          3170: static const struct debugger_token {
        !          3171:     char *name;
        !          3172:     int numargs;
        !          3173:     int (*fn)(struct debugger_token *token, u32 args[]);
        !          3174: } debugger_tokens[] = {
        !          3175:     TOKEN(bc,1), TOKEN(bl,0), TOKEN(bs,1), TOKEN(g,0), TOKEN(halt,0),
        !          3176:     {DT_help, "?", 0} , TOKEN(h,0), TOKEN(i,0), TOKEN(mp,2), 
        !          3177:     TOKEN(ms,3), TOKEN(rp,2), TOKEN(rs,2), TOKEN(s,0), TOKEN(tb,0), TOKEN(te,0)
        !          3178: };
        !          3179: 
        !          3180: #define NDT sizeof(debugger_tokens / sizeof(struct debugger_token))
        !          3181: 
        !          3182: static struct Scsi_Host * inode_to_host (struct inode *inode) {
        !          3183:     int dev;
        !          3184:     struct Scsi_Host *tmp;
        !          3185:     for (dev = MINOR(inode->rdev), host = first_host;
        !          3186:        (host->hostt == the_template); --dev, host = host->next)
        !          3187:        if (!dev) return host;
        !          3188:     return NULL;
        !          3189: }
        !          3190: 
        !          3191: 
        !          3192: static int
        !          3193: debugger_user_write (struct inode *inode,struct file *filp,
        !          3194:     char *buf,int count) {
        !          3195:     struct Scsi_Host *host;                    /* This SCSI host */
        !          3196:     struct NCR53c7x0_hostadata *hostdata;      
        !          3197:     char input_buf[80],                        /* Kernel space copy of buf */
        !          3198:        *ptr;                                   /* Pointer to argument list */
        !          3199:     u32 args[3];                               /* Arguments */
        !          3200:     int i, j, error, len;
        !          3201: 
        !          3202:     if (!(host = inode_to_host(inode)))
        !          3203:        return -ENXIO;
        !          3204: 
        !          3205:     hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
        !          3206: 
        !          3207:     if (error = verify_area(VERIFY_READ,buf,count))
        !          3208:        return error;
        !          3209: 
        !          3210:     if (count > 80) 
        !          3211:        return -EIO;
        !          3212: 
        !          3213:     memcpy_from_fs(input_buf, buf, count);
        !          3214: 
        !          3215:     if (input_buf[count - 1] != '\n')
        !          3216:        return -EIO;
        !          3217: 
        !          3218:     input_buf[count - 1]=0;
        !          3219: 
        !          3220:     for (i = 0; i < NDT; ++i) {
        !          3221:        len = strlen (debugger_tokens[i].name);
        !          3222:        if (!strncmp(input_buf, debugger_tokens[i].name, len)) 
        !          3223:            break;
        !          3224:     };
        !          3225: 
        !          3226:     if (i == NDT) 
        !          3227:        return -EIO;
        !          3228: 
        !          3229:     for (ptr = input_buf + len, j = 0; j < debugger_tokens[i].nargs && *ptr;) {
        !          3230:        if (*ptr == ' ' || *ptr == '\t') {
        !          3231:            ++ptr; 
        !          3232:        } else if (isdigit(*ptr)) {
        !          3233:            args[j++] = simple_strtoul (ptr, &ptr, 0);
        !          3234:        } else {
        !          3235:            return -EIO;
        !          3236:        } 
        !          3237:     }
        !          3238: 
        !          3239:     if (j != debugger_tokens[i].nargs)
        !          3240:        return -EIO;
        !          3241: 
        !          3242:     return count;
        !          3243: } 
        !          3244: 
        !          3245: static int 
        !          3246: debugger_user_read (struct inode *inode,struct file *filp,
        !          3247:     char *buf,int count) {
        !          3248:     struct Scsi_Host *instance;
        !          3249:     
        !          3250: }
        !          3251: 
        !          3252: static int 
        !          3253: debugger_kernel_write (struct Scsi_Host *host, char *buf, size_t
        !          3254:     buflen) {
        !          3255:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          3256:        host->hostdata;
        !          3257:     int copy, left;
        !          3258:     unsigned long flags;
        !          3259:     save_flags(flags);
        !          3260:     cli();
        !          3261:     while (buflen) {
        !          3262:        left = (hostdata->debug_buf + hostdata->debug_size - 1) -
        !          3263:            hostdata->debug_write;
        !          3264:        copy = (buflen <= left) ? buflen : left;
        !          3265:        memcpy (hostdata->debug_write, buf, copy);
        !          3266:        buf += copy;
        !          3267:        buflen -= copy;
        !          3268:        hostdata->debug_count += copy;
        !          3269:        if ((hostdata->debug_write += copy) == 
        !          3270:            (hostdata->debug_buf + hostdata->debug_size))
        !          3271:            hosdata->debug_write = hostdata->debug_buf;
        !          3272:     }
        !          3273:     restore_flags(flags);
        !          3274: }
        !          3275: 
        !          3276: #endif /* def NCRDEBUG */
        !          3277: 
        !          3278: /* 
        !          3279:  * Function : static void NCR538xx_soft_reset (struct Scsi_Host *host)
        !          3280:  *
        !          3281:  * Purpose :  perform a soft reset of the NCR53c8xx chip
        !          3282:  *
        !          3283:  * Inputs : host - pointer to this host adapter's structure
        !          3284:  *
        !          3285:  * Preconditions : NCR53c7x0_init must have been called for this 
        !          3286:  *      host.
        !          3287:  * 
        !          3288:  */
        !          3289: 
        !          3290: static void 
        !          3291: NCR53c8x0_soft_reset (struct Scsi_Host *host) {
        !          3292:     NCR53c7x0_local_declare();
        !          3293:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          3294:        host->hostdata;
        !          3295:     NCR53c7x0_local_setup(host);
        !          3296: 
        !          3297: 
        !          3298:     /*
        !          3299:      * Do a soft reset of the chip so that everything is 
        !          3300:      * reinitialized to the power-on state.
        !          3301:      *
        !          3302:      * Basically follow the procedure outlined in the NCR53c700
        !          3303:      * data manual under Chapter Six, How to Use, Steps Necessary to
        !          3304:      * Start SCRIPTS, with the exception of actually starting the 
        !          3305:      * script and setting up the synchronous transfer gunk.
        !          3306:      */
        !          3307: 
        !          3308:     NCR53c7x0_write8(ISTAT_REG_800, ISTAT_10_SRST);
        !          3309:     NCR53c7x0_write8(ISTAT_REG_800, 0);
        !          3310:     NCR53c7x0_write8(hostdata->dmode, hostdata->saved_dmode & ~DMODE_MAN);
        !          3311: 
        !          3312: 
        !          3313:     /* 
        !          3314:      * Respond to reselection by targets and use our _initiator_ SCSI ID  
        !          3315:      * for arbitration. If notyet, also respond to SCSI selection.
        !          3316:      *
        !          3317:      * XXX - Note : we must reprogram this when reselecting as 
        !          3318:      * a target.
        !          3319:      */
        !          3320: 
        !          3321: #ifdef notyet
        !          3322:     NCR53c7x0_write8(SCID_REG, (host->this_id & 7)|SCID_800_RRE|SCID_800_SRE);
        !          3323: #else
        !          3324:     NCR53c7x0_write8(SCID_REG, (host->this_id & 7)|SCID_800_RRE);
        !          3325: #endif
        !          3326:     NCR53c7x0_write8(RESPID_REG_800, hostdata->this_id_mask);
        !          3327: 
        !          3328:     /*
        !          3329:      * Use a maximum (1.6) second handshake to handshake timeout,
        !          3330:      * and SCSI recommended .5s selection timeout.
        !          3331:      */
        !          3332: 
        !          3333:     /*
        !          3334:      * The new gcc won't recognize preprocessing directives
        !          3335:      * within macro args.
        !          3336:      */
        !          3337: #if 0
        !          3338:     NCR53c7x0_write8(STIME0_REG_800, 
        !          3339:        ((selection_timeout << STIME0_800_SEL_SHIFT) & STIME0_800_SEL_MASK) 
        !          3340:        | ((15 << STIME0_800_HTH_SHIFT) & STIME0_800_HTH_MASK));
        !          3341: #else
        !          3342: /* Disable HTH interrupt */
        !          3343:     NCR53c7x0_write8(STIME0_REG_800, 
        !          3344:        ((selection_timeout << STIME0_800_SEL_SHIFT) & STIME0_800_SEL_MASK));
        !          3345: #endif
        !          3346: 
        !          3347: 
        !          3348:     /*
        !          3349:      * Enable active negation for happy synchronous transfers.
        !          3350:      */
        !          3351: 
        !          3352:     NCR53c7x0_write8(STEST3_REG_800, STEST3_800_TE);
        !          3353: 
        !          3354:     /*
        !          3355:      * Enable all interrupts, except parity which we only want when
        !          3356:      * the user requests it.
        !          3357:      */
        !          3358: 
        !          3359:     NCR53c7x0_write8(DIEN_REG, DIEN_800_MDPE | DIEN_800_BF |
        !          3360:                DIEN_ABRT | DIEN_SSI | DIEN_SIR | DIEN_800_IID);
        !          3361: 
        !          3362:     
        !          3363:     NCR53c7x0_write8(SIEN0_REG_800, ((hostdata->options & OPTION_PARITY) ?
        !          3364:            SIEN_PAR : 0) | SIEN_RST | SIEN_UDC | SIEN_SGE | SIEN_MA);
        !          3365:     NCR53c7x0_write8(SIEN1_REG_800, SIEN1_800_STO | SIEN1_800_HTH);
        !          3366: 
        !          3367:     /* 
        !          3368:      * Use saved clock frequency divisor and scripts loaded in 16 bit
        !          3369:      * mode flags from the saved dcntl.
        !          3370:      */
        !          3371: 
        !          3372:     NCR53c7x0_write8(DCNTL_REG, hostdata->saved_dcntl);
        !          3373:     NCR53c7x0_write8(CTEST4_REG_800, hostdata->saved_ctest4);
        !          3374: 
        !          3375:     /* Enable active negation */
        !          3376:     NCR53c7x0_write8(STEST3_REG_800, STEST3_800_TE);
        !          3377: }
        !          3378: 
        !          3379: /*
        !          3380:  * Function static struct NCR53c7x0_cmd *allocate_cmd (Scsi_Cmnd *cmd)
        !          3381:  * 
        !          3382:  * Purpose : Return the first free NCR53c7x0_cmd structure (which are 
        !          3383:  *     reused in a LIFO maner to minimize cache thrashing).
        !          3384:  *
        !          3385:  * Side effects : If we haven't yet scheduled allocation of NCR53c7x0_cmd
        !          3386:  *     structures for this device, do so.  Attempt to complete all scheduled
        !          3387:  *     allocations using kmalloc(), putting NCR53c7x0_cmd structures on 
        !          3388:  *     the free list.  Teach programmers not to drink and hack.
        !          3389:  *
        !          3390:  * Inputs : cmd - SCSI command
        !          3391:  *
        !          3392:  * Returns : NCR53c7x0_cmd structure allocated on behalf of cmd;
        !          3393:  *     NULL on failure.
        !          3394:  */
        !          3395: 
        !          3396: static struct NCR53c7x0_cmd *
        !          3397: allocate_cmd (Scsi_Cmnd *cmd) {
        !          3398:     struct Scsi_Host *host = cmd->host;
        !          3399:     struct NCR53c7x0_hostdata *hostdata = 
        !          3400:        (struct NCR53c7x0_hostdata *) host->hostdata;
        !          3401:     void *real;                        /* Real address */
        !          3402:     int size;                  /* Size of *tmp */
        !          3403:     struct NCR53c7x0_cmd *tmp;
        !          3404:     unsigned long flags;
        !          3405: 
        !          3406:     if (hostdata->options & OPTION_DEBUG_ALLOCATION)
        !          3407:        printk ("scsi%d : num_cmds = %d, can_queue = %d\n"
        !          3408:                "         target = %d, lun = %d, %s\n",
        !          3409:            host->host_no, hostdata->num_cmds, host->can_queue,
        !          3410:            cmd->target, cmd->lun, (hostdata->cmd_allocated[cmd->target] &
        !          3411:                (1 << cmd->lun)) ? "allready allocated" : "not allocated");
        !          3412: 
        !          3413: /*
        !          3414:  * If we have not yet reserved commands for this I_T_L nexus, and
        !          3415:  * the device exists (as indicated by permanant Scsi_Cmnd structures
        !          3416:  * being allocated under 1.3.x, or being outside of scan_scsis in 
        !          3417:  * 1.2.x), do so now.
        !          3418:  */
        !          3419:     if (!(hostdata->cmd_allocated[cmd->target] & (1 << cmd->lun)) &&
        !          3420: #ifdef LINUX_1_2
        !          3421:                                !in_scan_scsis
        !          3422: #else
        !          3423:                                cmd->device && cmd->device->has_cmdblocks
        !          3424: #endif
        !          3425:        ) {
        !          3426:        if ((hostdata->extra_allocate + hostdata->num_cmds) < host->can_queue) 
        !          3427:            hostdata->extra_allocate += host->cmd_per_lun;
        !          3428:        hostdata->cmd_allocated[cmd->target] |= (1 << cmd->lun);
        !          3429:     }
        !          3430: 
        !          3431:     for (; hostdata->extra_allocate > 0 ; --hostdata->extra_allocate, 
        !          3432:        ++hostdata->num_cmds) {
        !          3433:     /* historically, kmalloc has returned unaligned addresses; pad so we 
        !          3434:        have enough room to ROUNDUP */
        !          3435:        size = hostdata->max_cmd_size + sizeof (void *);
        !          3436: /* FIXME: for ISA bus '7xx chips, we need to or GFP_DMA in here */
        !          3437:        real = kmalloc (size, GFP_ATOMIC);
        !          3438:        if (!real) {
        !          3439:            if (hostdata->options & OPTION_DEBUG_ALLOCATION)
        !          3440:                printk ("scsi%d : kmalloc(%d) failed\n",
        !          3441:                    host->host_no, size);
        !          3442:            break;
        !          3443:        }
        !          3444:        tmp = ROUNDUP(real, void *);
        !          3445:        tmp->real = real;
        !          3446:        tmp->size = size;                       
        !          3447: #ifdef LINUX_1_2
        !          3448:        tmp->free = ((void (*)(void *, int)) kfree_s);
        !          3449: #else
        !          3450:        tmp->free = ((void (*)(void *, int)) kfree);
        !          3451: #endif
        !          3452:        save_flags (flags);
        !          3453:        cli();
        !          3454:        tmp->next = hostdata->free;
        !          3455:        hostdata->free = tmp;
        !          3456:        restore_flags (flags);
        !          3457:     }
        !          3458:     save_flags(flags);
        !          3459:     cli();
        !          3460:     tmp = (struct NCR53c7x0_cmd *) hostdata->free;
        !          3461:     if (tmp) {
        !          3462:        hostdata->free = tmp->next;
        !          3463:     }
        !          3464:     restore_flags(flags);
        !          3465:     if (!tmp)
        !          3466:        printk ("scsi%d : can't allocate command for target %d lun %d\n",
        !          3467:            host->host_no, cmd->target, cmd->lun);
        !          3468:     return tmp;
        !          3469: }
        !          3470: 
        !          3471: /*
        !          3472:  * Function static struct NCR53c7x0_cmd *create_cmd (Scsi_Cmnd *cmd) 
        !          3473:  *
        !          3474:  *
        !          3475:  * Purpose : allocate a NCR53c7x0_cmd structure, initialize it based on the 
        !          3476:  *     Scsi_Cmnd structure passed in cmd, including dsa and Linux field 
        !          3477:  *     initialization, and dsa code relocation.
        !          3478:  *
        !          3479:  * Inputs : cmd - SCSI command
        !          3480:  *
        !          3481:  * Returns : NCR53c7x0_cmd structure corresponding to cmd,
        !          3482:  *     NULL on failure.
        !          3483:  */
        !          3484: 
        !          3485: static struct NCR53c7x0_cmd *
        !          3486: create_cmd (Scsi_Cmnd *cmd) {
        !          3487:     NCR53c7x0_local_declare();
        !          3488:     struct Scsi_Host *host = cmd->host;
        !          3489:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          3490:         host->hostdata;        
        !          3491:     struct NCR53c7x0_cmd *tmp;         /* NCR53c7x0_cmd structure for this command */
        !          3492:     int datain,                /* Number of instructions per phase */
        !          3493:        dataout;
        !          3494:     int data_transfer_instructions, /* Count of dynamic instructions */
        !          3495:        i;                      /* Counter */
        !          3496:     u32 *cmd_datain,           /* Address of datain/dataout code */
        !          3497:        *cmd_dataout;           /* Incremented as we assemble */
        !          3498: #ifdef notyet
        !          3499:     unsigned char *msgptr;     /* Current byte in select message */
        !          3500:     int msglen;                        /* Length of whole select message */
        !          3501: #endif
        !          3502:     unsigned long flags;
        !          3503:     NCR53c7x0_local_setup(cmd->host);
        !          3504: 
        !          3505:     if (!(tmp = allocate_cmd (cmd)))
        !          3506:        return NULL;
        !          3507: 
        !          3508: 
        !          3509:     /*
        !          3510:      * Decide whether we need to generate commands for DATA IN,
        !          3511:      * DATA OUT, neither, or both based on the SCSI command 
        !          3512:      */
        !          3513: 
        !          3514:     switch (cmd->cmnd[0]) {
        !          3515:     /* These commands do DATA IN */
        !          3516:     case INQUIRY:
        !          3517:     case MODE_SENSE:
        !          3518:     case READ_6:
        !          3519:     case READ_10:
        !          3520:     case READ_CAPACITY:
        !          3521:     case REQUEST_SENSE:
        !          3522:        datain = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
        !          3523:        dataout = 0;
        !          3524:        break;
        !          3525:     /* These commands do DATA OUT */
        !          3526:     case MODE_SELECT: 
        !          3527:     case WRITE_6:
        !          3528:     case WRITE_10:
        !          3529: #if 0
        !          3530:        printk("scsi%d : command is ", host->host_no);
        !          3531:        print_command(cmd->cmnd);
        !          3532: #endif
        !          3533: #if 0
        !          3534:        printk ("scsi%d : %d scatter/gather segments\n", host->host_no,
        !          3535:            cmd->use_sg);
        !          3536: #endif
        !          3537:        datain = 0;
        !          3538:        dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
        !          3539: #if 0
        !          3540:        hostdata->options |= OPTION_DEBUG_INTR;
        !          3541: #endif
        !          3542:        break;
        !          3543:     /* 
        !          3544:      * These commands do no data transfer, we should force an
        !          3545:      * interrupt if a data phase is attempted on them.
        !          3546:      */
        !          3547:     case START_STOP:
        !          3548:     case TEST_UNIT_READY:
        !          3549:        datain = dataout = 0;
        !          3550:        break;
        !          3551:     /*
        !          3552:      * We don't know about these commands, so generate code to handle
        !          3553:      * both DATA IN and DATA OUT phases.
        !          3554:      */
        !          3555:     default:
        !          3556:        datain = dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
        !          3557:     }
        !          3558: 
        !          3559:     /*
        !          3560:      * New code : so that active pointers work correctly irregardless
        !          3561:      *         of where the saved data pointer is at, we want to immediately
        !          3562:      *         enter the dynamic code after selection, and on a non-data
        !          3563:      *         phase perform a CALL to the non-data phase handler, with
        !          3564:      *         returns back to this address.
        !          3565:      *
        !          3566:      *         If a phase mismatch is encountered in the middle of a 
        !          3567:      *         Block MOVE instruction, we want to _leave_ that instruction
        !          3568:      * unchanged as the current case is, modify a temporary buffer,
        !          3569:      * and point the active pointer (TEMP) at that.
        !          3570:      *
        !          3571:      *         Furthermore, we want to implement a saved data pointer, 
        !          3572:      *         set by the SAVE_DATA_POINTERs message.
        !          3573:      *
        !          3574:      *         So, the data transfer segments will change to 
        !          3575:      *         CALL data_transfer, WHEN NOT data phase
        !          3576:      *         MOVE x, x, WHEN data phase
        !          3577:      *         ( repeat )
        !          3578:      *         JUMP other_transfer
        !          3579:      */
        !          3580: 
        !          3581:     data_transfer_instructions = datain + dataout;
        !          3582: 
        !          3583:     /*
        !          3584:      * When we perform a request sense, we overwrite various things,
        !          3585:      * including the data transfer code.  Make sure we have enough
        !          3586:      * space to do that.
        !          3587:      */
        !          3588: 
        !          3589:     if (data_transfer_instructions < 2)
        !          3590:        data_transfer_instructions = 2;
        !          3591: 
        !          3592: 
        !          3593:     /*
        !          3594:      * The saved data pointer is set up so that a RESTORE POINTERS message 
        !          3595:      * will start the data transfer over at the beggining.
        !          3596:      */
        !          3597: 
        !          3598:     tmp->saved_data_pointer = virt_to_bus (hostdata->script) + 
        !          3599:        hostdata->E_data_transfer;
        !          3600: 
        !          3601:     /*
        !          3602:      * Initialize Linux specific fields.
        !          3603:      */
        !          3604: 
        !          3605:     tmp->cmd = cmd;
        !          3606:     tmp->next = NULL;
        !          3607:     tmp->flags = 0;
        !          3608:     tmp->dsa_next_addr = virt_to_bus(tmp->dsa) + hostdata->dsa_next - 
        !          3609:        hostdata->dsa_start;
        !          3610:     tmp->dsa_addr = virt_to_bus(tmp->dsa) - hostdata->dsa_start;
        !          3611: 
        !          3612:     /* 
        !          3613:      * Calculate addresses of dynamic code to fill in DSA
        !          3614:      */
        !          3615: 
        !          3616:     tmp->data_transfer_start = tmp->dsa + (hostdata->dsa_end - 
        !          3617:        hostdata->dsa_start) / sizeof(u32);
        !          3618:     tmp->data_transfer_end = tmp->data_transfer_start + 
        !          3619:        2 * data_transfer_instructions;
        !          3620: 
        !          3621:     cmd_datain = datain ? tmp->data_transfer_start : NULL;
        !          3622:     cmd_dataout = dataout ? (datain ? cmd_datain + 2 * datain : tmp->
        !          3623:        data_transfer_start) : NULL;
        !          3624: 
        !          3625:     /*
        !          3626:      * Fill in the NCR53c7x0_cmd structure as follows
        !          3627:      * dsa, with fixed up DSA code
        !          3628:      * datain code
        !          3629:      * dataout code
        !          3630:      */
        !          3631: 
        !          3632:     /* Copy template code into dsa and perform all necessary fixups */
        !          3633:     if (hostdata->dsa_fixup)
        !          3634:        hostdata->dsa_fixup(tmp);
        !          3635: 
        !          3636:     patch_dsa_32(tmp->dsa, dsa_next, 0, 0);
        !          3637:     patch_dsa_32(tmp->dsa, dsa_cmnd, 0, virt_to_bus(cmd));
        !          3638: 
        !          3639:     if (hostdata->options & OPTION_DEBUG_SYNCHRONOUS) 
        !          3640:        if (hostdata->sync[cmd->target].select_indirect != 
        !          3641:            ((hostdata->sync[cmd->target].scntl3_sanity << 24) | 
        !          3642:                (cmd->target << 16) | 
        !          3643:                (hostdata->sync[cmd->target].sxfer_sanity << 8))) {
        !          3644:            printk ("scsi%d :  sanity check failed select_indirect=0x%x\n",
        !          3645:                host->host_no, hostdata->sync[cmd->target].select_indirect);
        !          3646:            FATAL(host);
        !          3647: 
        !          3648:        }
        !          3649: 
        !          3650:     patch_dsa_32(tmp->dsa, dsa_select, 0, hostdata->sync[cmd->target].
        !          3651:        select_indirect);
        !          3652:     /*
        !          3653:      * Right now, we'll do the WIDE and SYNCHRONOUS negotiations on
        !          3654:      * different commands; although it should be trivial to do them
        !          3655:      * both at the same time.
        !          3656:      */
        !          3657:     if (hostdata->initiate_wdtr & (1 << cmd->target)) {
        !          3658:        memcpy ((void *) (tmp->select + 1), (void *) wdtr_message,
        !          3659:            sizeof(wdtr_message));
        !          3660:        patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(wdtr_message));
        !          3661:        save_flags(flags);
        !          3662:        cli();
        !          3663:        hostdata->initiate_wdtr &= ~(1 << cmd->target);
        !          3664:        restore_flags(flags);
        !          3665:     } else if (hostdata->initiate_sdtr & (1 << cmd->target)) {
        !          3666:        memcpy ((void *) (tmp->select + 1), (void *) sdtr_message, 
        !          3667:            sizeof(sdtr_message));
        !          3668:        patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(sdtr_message));
        !          3669:        tmp->flags |= CMD_FLAG_SDTR;
        !          3670:        save_flags(flags);
        !          3671:        cli();
        !          3672:        hostdata->initiate_sdtr &= ~(1 << cmd->target);
        !          3673:        restore_flags(flags);
        !          3674:     
        !          3675:     }
        !          3676: #if 1
        !          3677:     else if (!(hostdata->talked_to & (1 << cmd->target)) && 
        !          3678:                !(hostdata->options & OPTION_NO_ASYNC)) {
        !          3679:        memcpy ((void *) (tmp->select + 1), (void *) async_message, 
        !          3680:            sizeof(async_message));
        !          3681:        patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1 + sizeof(async_message));
        !          3682:        tmp->flags |= CMD_FLAG_SDTR;
        !          3683:     } 
        !          3684: #endif
        !          3685:     else 
        !          3686:        patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1);
        !          3687:     hostdata->talked_to |= (1 << cmd->target);
        !          3688:     tmp->select[0] = (hostdata->options & OPTION_DISCONNECT) ? 
        !          3689:        IDENTIFY (1, cmd->lun) : IDENTIFY (0, cmd->lun);
        !          3690:     patch_dsa_32(tmp->dsa, dsa_msgout, 1, virt_to_bus(tmp->select));
        !          3691:     patch_dsa_32(tmp->dsa, dsa_cmdout, 0, cmd->cmd_len);
        !          3692:     patch_dsa_32(tmp->dsa, dsa_cmdout, 1, virt_to_bus(cmd->cmnd));
        !          3693:     patch_dsa_32(tmp->dsa, dsa_dataout, 0, cmd_dataout ? 
        !          3694:            virt_to_bus (cmd_dataout)
        !          3695:        : virt_to_bus (hostdata->script) + hostdata->E_other_transfer);
        !          3696:     patch_dsa_32(tmp->dsa, dsa_datain, 0, cmd_datain ? 
        !          3697:            virt_to_bus (cmd_datain) 
        !          3698:        : virt_to_bus (hostdata->script) + hostdata->E_other_transfer);
        !          3699:     /* 
        !          3700:      * XXX - need to make endian aware, should use separate variables
        !          3701:      * for both status and message bytes.
        !          3702:      */
        !          3703:     patch_dsa_32(tmp->dsa, dsa_msgin, 0, 1);
        !          3704: /* 
        !          3705:  * FIXME : these only works for little endian.  We probably want to 
        !          3706:  *     provide message and status fields in the NCR53c7x0_cmd 
        !          3707:  *     structure, and assign them to cmd->result when we're done.
        !          3708:  */
        !          3709:     patch_dsa_32(tmp->dsa, dsa_msgin, 1, virt_to_bus(&cmd->result) + 1);
        !          3710:     patch_dsa_32(tmp->dsa, dsa_status, 0, 1);
        !          3711:     patch_dsa_32(tmp->dsa, dsa_status, 1, virt_to_bus(&cmd->result));
        !          3712:     patch_dsa_32(tmp->dsa, dsa_msgout_other, 0, 1);
        !          3713:     patch_dsa_32(tmp->dsa, dsa_msgout_other, 1, 
        !          3714:        virt_to_bus(&(hostdata->NCR53c7xx_msg_nop)));
        !          3715:     
        !          3716:     /*
        !          3717:      * Generate code for zero or more of the DATA IN, DATA OUT phases 
        !          3718:      * in the format 
        !          3719:      *
        !          3720:      * CALL data_transfer, WHEN NOT phase
        !          3721:      * MOVE first buffer length, first buffer address, WHEN phase
        !          3722:      * ...
        !          3723:      * MOVE last buffer length, last buffer address, WHEN phase
        !          3724:      * JUMP other_transfer
        !          3725:      */
        !          3726: 
        !          3727: /* 
        !          3728:  * See if we're getting to data transfer by generating an unconditional 
        !          3729:  * interrupt.
        !          3730:  */
        !          3731: #if 0
        !          3732:     if (datain) {
        !          3733:        cmd_datain[0] = 0x98080000;
        !          3734:        cmd_datain[1] = 0x03ffd00d;
        !          3735:        cmd_datain += 2;
        !          3736:     }
        !          3737: #endif
        !          3738: 
        !          3739: /* 
        !          3740:  * XXX - I'm undecided whether all of this nonsense is faster
        !          3741:  * in the long run, or whether I should just go and implement a loop
        !          3742:  * on the NCR chip using table indirect mode?
        !          3743:  *
        !          3744:  * In any case, this is how it _must_ be done for 53c700/700-66 chips,
        !          3745:  * so this stays even when we come up with something better.
        !          3746:  *
        !          3747:  * When we're limited to 1 simultaneous command, no overlapping processing,
        !          3748:  * we're seeing 630K/sec, with 7% CPU usage on a slow Syquest 45M
        !          3749:  * drive.
        !          3750:  *
        !          3751:  * Not bad, not good. We'll see.
        !          3752:  */
        !          3753: 
        !          3754:     for (i = 0; cmd->use_sg ? (i < cmd->use_sg) : !i; cmd_datain += 4, 
        !          3755:        cmd_dataout += 4, ++i) {
        !          3756:        u32 buf = cmd->use_sg ? 
        !          3757:            virt_to_bus(((struct scatterlist *)cmd->buffer)[i].address) :
        !          3758:            virt_to_bus(cmd->request_buffer);
        !          3759:        u32 count = cmd->use_sg ?
        !          3760:            ((struct scatterlist *)cmd->buffer)[i].length :
        !          3761:            cmd->request_bufflen;
        !          3762: 
        !          3763:        if (datain) {
        !          3764:            /* CALL other_in, WHEN NOT DATA_IN */  
        !          3765:            cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL | 
        !          3766:                DCMD_TCI_IO) << 24) | 
        !          3767:                DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
        !          3768:            cmd_datain[1] = virt_to_bus (hostdata->script) + 
        !          3769:                hostdata->E_other_in;
        !          3770:            /* MOVE count, buf, WHEN DATA_IN */
        !          3771:            cmd_datain[2] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I | DCMD_BMI_IO) 
        !          3772:                << 24) | count;
        !          3773:            cmd_datain[3] = buf;
        !          3774: #if 0
        !          3775:            print_insn (host, cmd_datain, "dynamic ", 1);
        !          3776:            print_insn (host, cmd_datain + 2, "dynamic ", 1);
        !          3777: #endif
        !          3778:        }
        !          3779:        if (dataout) {
        !          3780:            /* CALL other_out, WHEN NOT DATA_OUT */
        !          3781:            cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL) << 24) | 
        !          3782:                DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
        !          3783:            cmd_dataout[1] = virt_to_bus(hostdata->script) + 
        !          3784:                hostdata->E_other_out;
        !          3785:            /* MOVE count, buf, WHEN DATA+OUT */
        !          3786:            cmd_dataout[2] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I) << 24) 
        !          3787:                | count;
        !          3788:            cmd_dataout[3] = buf;
        !          3789: #if 0
        !          3790:            print_insn (host, cmd_dataout, "dynamic ", 1);
        !          3791:            print_insn (host, cmd_dataout + 2, "dynamic ", 1);
        !          3792: #endif
        !          3793:        }
        !          3794:     }
        !          3795: 
        !          3796:     /*
        !          3797:      * Install JUMP instructions after the data transfer routines to return
        !          3798:      * control to the do_other_transfer routines.
        !          3799:      */
        !          3800:   
        !          3801:     
        !          3802:     if (datain) {
        !          3803:        cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
        !          3804:            DBC_TCI_TRUE;
        !          3805:        cmd_datain[1] = virt_to_bus(hostdata->script) + 
        !          3806:            hostdata->E_other_transfer;
        !          3807: #if 0
        !          3808:        print_insn (host, cmd_datain, "dynamic jump ", 1);
        !          3809: #endif
        !          3810:        cmd_datain += 2; 
        !          3811:     }
        !          3812: #if 0
        !          3813:     if (datain) {
        !          3814:        cmd_datain[0] = 0x98080000;
        !          3815:        cmd_datain[1] = 0x03ffdeed;
        !          3816:        cmd_datain += 2;
        !          3817:     }
        !          3818: #endif
        !          3819:     if (dataout) {
        !          3820:        cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
        !          3821:            DBC_TCI_TRUE;
        !          3822:        cmd_dataout[1] = virt_to_bus(hostdata->script) + 
        !          3823:            hostdata->E_other_transfer;
        !          3824: #if 0
        !          3825:        print_insn (host, cmd_dataout, "dynamic jump ", 1);
        !          3826: #endif
        !          3827:        cmd_dataout += 2;
        !          3828:     }
        !          3829:     return tmp;
        !          3830: }
        !          3831: 
        !          3832: /*
        !          3833:  * Function : int NCR53c7xx_queue_command (Scsi_Cmnd *cmd,
        !          3834:  *      void (*done)(Scsi_Cmnd *))
        !          3835:  *
        !          3836:  * Purpose :  enqueues a SCSI command
        !          3837:  *
        !          3838:  * Inputs : cmd - SCSI command, done - function called on completion, with
        !          3839:  *      a pointer to the command descriptor.
        !          3840:  *
        !          3841:  * Returns : 0
        !          3842:  *
        !          3843:  * Side effects :
        !          3844:  *      cmd is added to the per instance driver issue_queue, with major
        !          3845:  *      twiddling done to the host specific fields of cmd.  If the
        !          3846:  *      process_issue_queue corouting isn't running, it is restarted.
        !          3847:  * 
        !          3848:  * NOTE : we use the host_scribble field of the Scsi_Cmnd structure to 
        !          3849:  *     hold our own data, and pervert the ptr field of the SCp field
        !          3850:  *     to create a linked list.
        !          3851:  */
        !          3852: 
        !          3853: int
        !          3854: NCR53c7xx_queue_command (Scsi_Cmnd *cmd, void (* done)(Scsi_Cmnd *)) {
        !          3855:     struct Scsi_Host *host = cmd->host;
        !          3856:     struct NCR53c7x0_hostdata *hostdata = 
        !          3857:        (struct NCR53c7x0_hostdata *) host->hostdata;
        !          3858:     unsigned long flags;
        !          3859:     Scsi_Cmnd *tmp;
        !          3860: 
        !          3861:     cmd->scsi_done = done;
        !          3862:     cmd->host_scribble = NULL;
        !          3863:     cmd->SCp.ptr = NULL;
        !          3864:     cmd->SCp.buffer = NULL;
        !          3865: 
        !          3866:     save_flags(flags);
        !          3867:     cli();
        !          3868:     if ((hostdata->options & (OPTION_DEBUG_INIT_ONLY|OPTION_DEBUG_PROBE_ONLY)) 
        !          3869:        || ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
        !          3870:            !(hostdata->debug_lun_limit[cmd->target] & (1 << cmd->lun))) 
        !          3871: #ifdef LINUX_1_2
        !          3872:        || cmd->target > 7
        !          3873: #else
        !          3874:        || cmd->target > host->max_id
        !          3875: #endif
        !          3876:        || cmd->target == host->this_id
        !          3877:        || hostdata->state == STATE_DISABLED) {
        !          3878:        printk("scsi%d : disabled or bad target %d lun %d\n", host->host_no,
        !          3879:            cmd->target, cmd->lun);
        !          3880:        cmd->result = (DID_BAD_TARGET << 16);
        !          3881:     } else if ((hostdata->options & OPTION_DEBUG_NCOMMANDS_LIMIT) &&
        !          3882:        (hostdata->debug_count_limit == 0)) {
        !          3883:        printk("scsi%d : maximum commands exceeded\n", host->host_no);
        !          3884:        cmd->result = (DID_BAD_TARGET << 16);
        !          3885:        cmd->result = (DID_BAD_TARGET << 16);
        !          3886:     } else if (hostdata->options & OPTION_DEBUG_READ_ONLY) {
        !          3887:        switch (cmd->cmnd[0]) {
        !          3888:        case WRITE_6:
        !          3889:        case WRITE_10:
        !          3890:            printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
        !          3891:                host->host_no);
        !          3892:            cmd->result = (DID_BAD_TARGET << 16);
        !          3893:        }
        !          3894:     } else {
        !          3895:        if ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
        !          3896:            hostdata->debug_count_limit != -1) 
        !          3897:            --hostdata->debug_count_limit;
        !          3898:        restore_flags (flags);
        !          3899:        cmd->result = 0xffff;   /* The NCR will overwrite message
        !          3900:                                       and status with valid data */
        !          3901:        cmd->host_scribble = (unsigned char *) tmp = create_cmd (cmd);
        !          3902:     }
        !          3903:     cli();
        !          3904:     /*
        !          3905:      * REQUEST SENSE commands are inserted at the head of the queue 
        !          3906:      * so that we do not clear the contingent allegience condition
        !          3907:      * they may be looking at.
        !          3908:      */
        !          3909: 
        !          3910:     if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
        !          3911:        cmd->SCp.ptr = (unsigned char *) hostdata->issue_queue;
        !          3912:        hostdata->issue_queue = cmd;
        !          3913:     } else {
        !          3914:        for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->SCp.ptr; 
        !          3915:                tmp = (Scsi_Cmnd *) tmp->SCp.ptr);
        !          3916:        tmp->SCp.ptr = (unsigned char *) cmd;
        !          3917:     }
        !          3918:     restore_flags (flags);
        !          3919:     run_process_issue_queue();
        !          3920:     return 0;
        !          3921: }
        !          3922: 
        !          3923: /*
        !          3924:  * Function : void to_schedule_list (struct Scsi_Host *host,
        !          3925:  *     struct NCR53c7x0_hostdata * hostdata, Scsi_Cmnd *cmd)
        !          3926:  *
        !          3927:  * Purpose : takes a SCSI command which was just removed from the 
        !          3928:  *     issue queue, and deals with it by inserting it in the first
        !          3929:  *     free slot in the schedule list or by terminating it immediately.
        !          3930:  *
        !          3931:  * Inputs : 
        !          3932:  *     host - SCSI host adater; hostdata - hostdata structure for 
        !          3933:  *     this adapter; cmd - a pointer to the command; should have 
        !          3934:  *     the host_scribble field initialized to point to a valid 
        !          3935:  *     
        !          3936:  * Side effects : 
        !          3937:  *      cmd is added to the per instance schedule list, with minor 
        !          3938:  *      twiddling done to the host specific fields of cmd.
        !          3939:  *
        !          3940:  */
        !          3941: 
        !          3942: static __inline__ void
        !          3943: to_schedule_list (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
        !          3944:     struct NCR53c7x0_cmd *cmd) {
        !          3945:     NCR53c7x0_local_declare();
        !          3946:     Scsi_Cmnd *tmp = cmd->cmd;
        !          3947:     unsigned long flags;
        !          3948:     /* dsa start is negative, so subtraction is used */
        !          3949:     volatile u32 *current;
        !          3950: 
        !          3951:     int i;
        !          3952:     NCR53c7x0_local_setup(host);
        !          3953: #if 0  
        !          3954:     printk("scsi%d : new dsa is 0x%lx (virt 0x%p)\n", host->host_no, 
        !          3955:        virt_to_bus(dsa), dsa);
        !          3956: #endif
        !          3957: 
        !          3958:     save_flags(flags);
        !          3959:     cli();
        !          3960:     
        !          3961:     /* 
        !          3962:      * Work arround race condition : if an interrupt fired and we 
        !          3963:      * got disabled forget about this command.
        !          3964:      */
        !          3965: 
        !          3966:     if (hostdata->state == STATE_DISABLED) {
        !          3967:        printk("scsi%d : driver disabled\n", host->host_no);
        !          3968:        tmp->result = (DID_BAD_TARGET << 16);
        !          3969:        cmd->next = (struct NCR53c7x0_cmd *) hostdata->free;
        !          3970:        hostdata->free = cmd;
        !          3971:        tmp->scsi_done(tmp);
        !          3972:        restore_flags (flags);
        !          3973:        return;
        !          3974:     }
        !          3975: 
        !          3976:     for (i = host->can_queue, current = hostdata->schedule; 
        !          3977:        i > 0  && current[0] != hostdata->NOP_insn;
        !          3978:        --i, current += 2 /* JUMP instructions are two words */);
        !          3979: 
        !          3980:     if (i > 0) {
        !          3981:        ++hostdata->busy[tmp->target][tmp->lun];
        !          3982:        cmd->next = hostdata->running_list;
        !          3983:        hostdata->running_list = cmd;
        !          3984: 
        !          3985:        /* Restore this instruction to a NOP once the command starts */
        !          3986:        cmd->dsa [(hostdata->dsa_jump_dest - hostdata->dsa_start) / 
        !          3987:            sizeof(u32)] = (u32) virt_to_bus ((void *)current);
        !          3988:        /* Replace the current jump operand.  */
        !          3989:        current[1] =
        !          3990:            virt_to_bus ((void *) cmd->dsa) + hostdata->E_dsa_code_begin -
        !          3991:            hostdata->E_dsa_code_template;
        !          3992:        /* Replace the NOP instruction with a JUMP */
        !          3993:        current[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) |
        !          3994:            DBC_TCI_TRUE;
        !          3995:     }  else {
        !          3996:        printk ("scsi%d: no free slot\n", host->host_no);
        !          3997:        disable(host);
        !          3998:        tmp->result = (DID_ERROR << 16);
        !          3999:        cmd->next = (struct NCR53c7x0_cmd *) hostdata->free;
        !          4000:        hostdata->free = cmd;
        !          4001:        tmp->scsi_done(tmp);
        !          4002:        restore_flags (flags);
        !          4003:        return;
        !          4004:     }
        !          4005: 
        !          4006:     /* 
        !          4007:      * If the NCR chip is in an idle state, start it running the scheduler
        !          4008:      * immediately.  Otherwise, signal the chip to jump to schedule as 
        !          4009:      * soon as it is idle.
        !          4010:      */
        !          4011:     if (hostdata->idle) {
        !          4012:        hostdata->idle = 0;
        !          4013:        hostdata->state = STATE_RUNNING;
        !          4014:        NCR53c7x0_write32 (DSP_REG,  virt_to_bus ((void *)hostdata->schedule));
        !          4015:     } else {
        !          4016:        NCR53c7x0_write8(hostdata->istat, ISTAT_10_SIGP);
        !          4017:     }
        !          4018: 
        !          4019:     restore_flags(flags);
        !          4020: }
        !          4021: 
        !          4022: /*
        !          4023:  * Function : busyp (struct Scsi_Host *host, struct NCR53c7x0_hostdata 
        !          4024:  *     *hostdata, Scsi_Cmnd *cmd)
        !          4025:  *
        !          4026:  * Purpose : decide if we can pass the given SCSI command on to the 
        !          4027:  *     device in question or not.
        !          4028:  *  
        !          4029:  * Returns : non-zero when we're busy, 0 when we aren't.
        !          4030:  */
        !          4031: 
        !          4032: static __inline__ int
        !          4033: busyp (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata, 
        !          4034:     Scsi_Cmnd *cmd) {
        !          4035:     /* FIXME : in the future, this needs to accomodate SCSI-II tagged
        !          4036:        queuing, and we may be able to play with fairness here a bit.
        !          4037:      */
        !          4038:     return hostdata->busy[cmd->target][cmd->lun];
        !          4039: }
        !          4040: 
        !          4041: /*
        !          4042:  * Function : process_issue_queue (void)
        !          4043:  *
        !          4044:  * Purpose : transfer commands from the issue queue to NCR start queue 
        !          4045:  *     of each NCR53c7/8xx in the system, avoiding kernel stack 
        !          4046:  *     overflows when the scsi_done() function is invoked recursively.
        !          4047:  * 
        !          4048:  * NOTE : process_issue_queue exits with interrupts *disabled*, so the 
        !          4049:  *     caller must renable them if it desires.
        !          4050:  * 
        !          4051:  * NOTE : process_issue_queue should be called from both 
        !          4052:  *     NCR53c7x0_queue_command() and from the interrupt handler 
        !          4053:  *     after command completion in case NCR53c7x0_queue_command()
        !          4054:  *     isn't invoked again but we've freed up resources that are
        !          4055:  *     needed.
        !          4056:  */
        !          4057: 
        !          4058: static void 
        !          4059: process_issue_queue (unsigned long flags) {
        !          4060:     Scsi_Cmnd *tmp, *prev;
        !          4061:     struct Scsi_Host *host;
        !          4062:     struct NCR53c7x0_hostdata *hostdata;
        !          4063:     int done;
        !          4064: 
        !          4065:     /*
        !          4066:      * We run (with interrupts disabled) until we're sure that none of 
        !          4067:      * the host adapters have anything that can be done, at which point 
        !          4068:      * we set process_issue_queue_running to 0 and exit.
        !          4069:      *
        !          4070:      * Interrupts are enabled before doing various other internal 
        !          4071:      * instructions, after we've decided that we need to run through
        !          4072:      * the loop again.
        !          4073:      *
        !          4074:      */
        !          4075: 
        !          4076:     do {
        !          4077:        cli(); /* Freeze request queues */
        !          4078:        done = 1;
        !          4079:        for (host = first_host; host && host->hostt == the_template; 
        !          4080:            host = host->next) {
        !          4081:            hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
        !          4082:            cli();
        !          4083:            if (hostdata->issue_queue) {
        !          4084:                if (hostdata->state == STATE_DISABLED) {
        !          4085:                    tmp = (Scsi_Cmnd *) hostdata->issue_queue;
        !          4086:                    hostdata->issue_queue = (Scsi_Cmnd *) tmp->SCp.ptr;
        !          4087:                    tmp->result = (DID_BAD_TARGET << 16);
        !          4088:                    if (tmp->host_scribble) {
        !          4089:                        ((struct NCR53c7x0_cmd *)tmp->host_scribble)->next = 
        !          4090:                            hostdata->free;
        !          4091:                        hostdata->free = 
        !          4092:                            (struct NCR53c7x0_cmd *)tmp->host_scribble;
        !          4093:                        tmp->host_scribble = NULL;
        !          4094:                    }
        !          4095:                    tmp->scsi_done (tmp);
        !          4096:                    done = 0;
        !          4097:                } else 
        !          4098:                    for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, 
        !          4099:                        prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) 
        !          4100:                        tmp->SCp.ptr) 
        !          4101:                        if (!tmp->host_scribble || 
        !          4102:                            !busyp (host, hostdata, tmp)) {
        !          4103:                                if (prev)
        !          4104:                                    prev->SCp.ptr = tmp->SCp.ptr;
        !          4105:                                else
        !          4106:                                    hostdata->issue_queue = (Scsi_Cmnd *) 
        !          4107:                                        tmp->SCp.ptr;
        !          4108:                            tmp->SCp.ptr = NULL;
        !          4109:                            if (tmp->host_scribble) {
        !          4110:                                if (hostdata->options & OPTION_DEBUG_QUEUES) 
        !          4111:                                    printk ("scsi%d : moving command for target %d lun %d to start list\n",
        !          4112:                                        host->host_no, tmp->target, tmp->lun);
        !          4113:                
        !          4114: 
        !          4115:                                to_schedule_list (host, hostdata, 
        !          4116:                                    (struct NCR53c7x0_cmd *)
        !          4117:                                    tmp->host_scribble);
        !          4118:                            } else {
        !          4119:                                if (((tmp->result & 0xff) == 0xff) ||
        !          4120:                                    ((tmp->result & 0xff00) == 0xff00)) {
        !          4121:                                    printk ("scsi%d : danger Will Robinson!\n",
        !          4122:                                        host->host_no);
        !          4123:                                    tmp->result = DID_ERROR << 16;
        !          4124:                                    disable (host);
        !          4125:                                }
        !          4126:                                tmp->scsi_done(tmp);
        !          4127:                            }
        !          4128:                            done = 0;
        !          4129:                        } /* if target/lun is not busy */
        !          4130:            } /* if hostdata->issue_queue */
        !          4131:            if (!done)
        !          4132:                restore_flags (flags);
        !          4133:        } /* for host */
        !          4134:     } while (!done);
        !          4135:     process_issue_queue_running = 0;
        !          4136: }
        !          4137: 
        !          4138: /*
        !          4139:  * Function : static void intr_scsi (struct Scsi_Host *host, 
        !          4140:  *     struct NCR53c7x0_cmd *cmd)
        !          4141:  *
        !          4142:  * Purpose : handle all SCSI interrupts, indicated by the setting 
        !          4143:  *     of the SIP bit in the ISTAT register.
        !          4144:  *
        !          4145:  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
        !          4146:  *     may be NULL.
        !          4147:  */
        !          4148: 
        !          4149: static void 
        !          4150: intr_scsi (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
        !          4151:     NCR53c7x0_local_declare();
        !          4152:     struct NCR53c7x0_hostdata *hostdata = 
        !          4153:        (struct NCR53c7x0_hostdata *) host->hostdata;
        !          4154:     unsigned char sstat0_sist0, sist1,                 /* Registers */
        !          4155:            fatal;                              /* Did a fatal interrupt 
        !          4156:                                                   occur ? */
        !          4157:    
        !          4158:     int is_8xx_chip;            
        !          4159:     NCR53c7x0_local_setup(host);
        !          4160: 
        !          4161:     fatal = 0;
        !          4162: 
        !          4163:     is_8xx_chip = ((unsigned) (hostdata->chip - 800)) < 100;
        !          4164:     if (is_8xx_chip) {
        !          4165:        sstat0_sist0 = NCR53c7x0_read8(SIST0_REG_800);
        !          4166:        udelay(1);
        !          4167:        sist1 = NCR53c7x0_read8(SIST1_REG_800);
        !          4168:     } else {
        !          4169:        sstat0_sist0 = NCR53c7x0_read8(SSTAT0_REG);
        !          4170:        sist1 = 0;
        !          4171:     }
        !          4172: 
        !          4173:     if (hostdata->options & OPTION_DEBUG_INTR) 
        !          4174:        printk ("scsi%d : SIST0 0x%0x, SIST1 0x%0x\n", host->host_no,
        !          4175:            sstat0_sist0, sist1);
        !          4176: 
        !          4177:     /* 250ms selection timeout */
        !          4178:     if ((is_8xx_chip && (sist1 & SIST1_800_STO)) || 
        !          4179:         (!is_8xx_chip && (sstat0_sist0 & SSTAT0_700_STO))) {
        !          4180:        fatal = 1;
        !          4181:        if (hostdata->options & OPTION_DEBUG_INTR) {
        !          4182:            printk ("scsi%d : Selection Timeout\n", host->host_no);
        !          4183:            if (cmd) {
        !          4184:                printk("scsi%d : target %d, lun %d, command ",
        !          4185:                    host->host_no, cmd->cmd->target, cmd->cmd->lun);
        !          4186:                print_command (cmd->cmd->cmnd);
        !          4187:                printk("scsi%d : dsp = 0x%x (virt 0x%p)\n", host->host_no,
        !          4188:                    NCR53c7x0_read32(DSP_REG),
        !          4189:                    bus_to_virt(NCR53c7x0_read32(DSP_REG)));
        !          4190:            } else {
        !          4191:                printk("scsi%d : no command\n", host->host_no);
        !          4192:            }
        !          4193:        }
        !          4194: /*
        !          4195:  * XXX - question : how do we want to handle the Illegal Instruction
        !          4196:  *     interrupt, which may occur before or after the Selection Timeout
        !          4197:  *     interrupt?
        !          4198:  */
        !          4199: 
        !          4200:        if (1) {
        !          4201:            hostdata->idle = 1;
        !          4202:            hostdata->expecting_sto = 0;
        !          4203: 
        !          4204:            if (hostdata->test_running) {
        !          4205:                hostdata->test_running = 0;
        !          4206:                hostdata->test_completed = 3;
        !          4207:            } else if (cmd) {
        !          4208:                abnormal_finished(cmd, DID_BAD_TARGET << 16);
        !          4209:            }
        !          4210: #if 0      
        !          4211:            hostdata->intrs = 0;
        !          4212: #endif
        !          4213:        }
        !          4214:     } 
        !          4215: 
        !          4216: /*
        !          4217:  * FIXME : in theory, we can also get a UDC when a STO occurs.
        !          4218:  */
        !          4219:     if (sstat0_sist0 & SSTAT0_UDC) {
        !          4220:        fatal = 1;
        !          4221:        if (cmd) {
        !          4222:            printk("scsi%d : target %d lun %d unexpected disconnect\n",
        !          4223:                host->host_no, cmd->cmd->target, cmd->cmd->lun);
        !          4224:            print_lots (host);
        !          4225:            abnormal_finished(cmd, DID_ERROR << 16);
        !          4226:        } else 
        !          4227:             printk("scsi%d : unexpected disconnect (no command)\n",
        !          4228:                host->host_no);
        !          4229: 
        !          4230:        hostdata->dsp = (u32 *) hostdata->schedule;
        !          4231:        hostdata->dsp_changed = 1;
        !          4232:     }
        !          4233: 
        !          4234:     /* SCSI PARITY error */
        !          4235:     if (sstat0_sist0 & SSTAT0_PAR) {
        !          4236:        fatal = 1;
        !          4237:        if (cmd && cmd->cmd) {
        !          4238:            printk("scsi%d : target %d lun %d parity error.\n",
        !          4239:                host->host_no, cmd->cmd->target, cmd->cmd->lun);
        !          4240:            abnormal_finished (cmd, DID_PARITY << 16); 
        !          4241:        } else
        !          4242:            printk("scsi%d : parity error\n", host->host_no);
        !          4243:        /* Should send message out, parity error */
        !          4244: 
        !          4245:        /* XXX - Reduce synchronous transfer rate! */
        !          4246:        hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
        !          4247:            sizeof(u32);
        !          4248:        hostdata->dsp_changed = 1; 
        !          4249:     /* SCSI GROSS error */
        !          4250:     } 
        !          4251: 
        !          4252:     if (sstat0_sist0 & SSTAT0_SGE) {
        !          4253:        fatal = 1;
        !          4254:        printk("scsi%d : gross error\n", host->host_no);
        !          4255:        /* Reset SCSI offset */
        !          4256:        if ((hostdata->chip / 100) == 8) {
        !          4257:            NCR53c7x0_write8 (STEST2_REG_800, STEST2_800_ROF);
        !          4258:        }
        !          4259:        
        !          4260:        /* 
        !          4261:          * A SCSI gross error may occur when we have 
        !          4262:         *
        !          4263:         * - A synchronous offset which causes the SCSI FIFO to be overwritten.
        !          4264:         *
        !          4265:         * - A REQ which causes the maxmimum synchronous offset programmed in 
        !          4266:         *      the SXFER register to be exceeded.
        !          4267:         *
        !          4268:         * - A phase change with an outstanding synchronous offset.
        !          4269:         *
        !          4270:         * - Residual data in the synchronous data FIFO, with a transfer
        !          4271:         *      other than a synchronous receive is started.$#
        !          4272:         */
        !          4273:                
        !          4274: 
        !          4275:        /* XXX Should deduce synchronous transfer rate! */
        !          4276:        hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
        !          4277:            sizeof(u32);
        !          4278:        hostdata->dsp_changed = 1;
        !          4279:     /* Phase mismatch */
        !          4280:     } 
        !          4281: 
        !          4282:     if (sstat0_sist0 & SSTAT0_MA) {
        !          4283:        fatal = 1;
        !          4284:        if (hostdata->options & OPTION_DEBUG_INTR)
        !          4285:            printk ("scsi%d : SSTAT0_MA\n", host->host_no);
        !          4286:        intr_phase_mismatch (host, cmd);
        !          4287:     }
        !          4288: 
        !          4289: #if 0
        !          4290:     if (sstat0_sist0 & SIST0_800_RSL) 
        !          4291:        printk ("scsi%d : Oh no Mr. Bill!\n", host->host_no);
        !          4292: #endif
        !          4293:     
        !          4294: /*
        !          4295:  * If a fatal SCSI interrupt occurs, we must insure that the DMA and
        !          4296:  * SCSI FIFOs were flushed.
        !          4297:  */
        !          4298: 
        !          4299:     if (fatal) {
        !          4300:        if (!hostdata->dstat_valid) {
        !          4301:            hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
        !          4302:            hostdata->dstat_valid = 1;
        !          4303:        }
        !          4304: 
        !          4305: /* XXX - code check for 700/800 chips */
        !          4306:        if (!(hostdata->dstat & DSTAT_DFE)) {
        !          4307:            printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
        !          4308:            if (NCR53c7x0_read8 (CTEST2_REG_800) & CTEST2_800_DDIR) {
        !          4309:                printk ("scsi%d: Flushing DMA FIFO\n", 
        !          4310:                        host->host_no);
        !          4311:                NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_FLF);
        !          4312:                while (!((hostdata->dstat = NCR53c7x0_read8(DSTAT_REG)) &
        !          4313:                    DSTAT_DFE));
        !          4314:            } else {
        !          4315:                NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_CLF);
        !          4316:                while (NCR53c7x0_read8 (CTEST3_REG_800) & CTEST3_800_CLF);
        !          4317:            }
        !          4318:            hostdata->dstat |= DSTAT_DFE;
        !          4319:        }
        !          4320:     }
        !          4321: }
        !          4322: 
        !          4323: /*
        !          4324:  * Function : static void NCR53c7x0_intr (int irq, struct pt_regs * regs)
        !          4325:  *
        !          4326:  * Purpose : handle NCR53c7x0 interrupts for all NCR devices sharing
        !          4327:  *     the same IRQ line.  
        !          4328:  * 
        !          4329:  * Inputs : Since we're using the SA_INTERRUPT interrupt handler
        !          4330:  *     semantics, irq indicates the interrupt which invoked 
        !          4331:  *     this handler.  
        !          4332:  */
        !          4333: 
        !          4334: static void 
        !          4335: NCR53c7x0_intr (int irq, struct pt_regs * regs) {
        !          4336:     NCR53c7x0_local_declare();
        !          4337:     struct Scsi_Host *host;                    /* Host we are looking at */
        !          4338:     unsigned char istat;                       /* Values of interrupt regs */
        !          4339:     struct NCR53c7x0_hostdata *hostdata;       /* host->hostdata */
        !          4340:     struct NCR53c7x0_cmd *cmd,                 /* command which halted */
        !          4341:        **cmd_prev_ptr;
        !          4342:     u32 *dsa;                                  /* DSA */
        !          4343:     int done = 1;                              /* Indicates when handler 
        !          4344:                                                   should terminate */
        !          4345:     int interrupted = 0;                       /* This HA generated 
        !          4346:                                                   an interrupt */
        !          4347:     int have_intfly;                           /* Don't print warning 
        !          4348:                                                   messages when we stack
        !          4349:                                                   INTFLYs */
        !          4350:     unsigned long flags;                               
        !          4351: 
        !          4352: #ifdef NCR_DEBUG
        !          4353:     char buf[80];                              /* Debugging sprintf buffer */
        !          4354:     size_t buflen;                             /* Length of same */
        !          4355: #endif
        !          4356: 
        !          4357:     do {
        !          4358:        done = 1;
        !          4359:        for (host = first_host; host; host = host->next) 
        !          4360:            if (host->hostt == the_template && host->irq == irq) {
        !          4361:            NCR53c7x0_local_setup(host);
        !          4362: 
        !          4363:            hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
        !          4364:            hostdata->dsp_changed = 0;
        !          4365:            interrupted = 0;
        !          4366:            have_intfly = 0;
        !          4367: 
        !          4368:            do {
        !          4369:                int is_8xx_chip;
        !          4370: 
        !          4371:                hostdata->dstat_valid = 0;
        !          4372:                interrupted = 0;
        !          4373:                /*
        !          4374:                 * Only read istat once, since reading it again will unstack
        !          4375:                 * interrupts?
        !          4376:                 */
        !          4377:                istat = NCR53c7x0_read8(hostdata->istat);
        !          4378: 
        !          4379:                /*
        !          4380:                 * INTFLY interrupts are used by the NCR53c720, NCR53c810,
        !          4381:                 * and NCR53c820 to signify completion of a command.  Since 
        !          4382:                 * the SCSI processor continues running, we can't just look
        !          4383:                 * at the contents of the DSA register and continue running.
        !          4384:                 */
        !          4385: /* XXX - this is too big, offends my sense of aesthetics, and should 
        !          4386:    move to intr_intfly() */
        !          4387:                is_8xx_chip = ((unsigned) (hostdata->chip - 800)) < 100;
        !          4388:                if ((hostdata->options & OPTION_INTFLY) && 
        !          4389:                    (is_8xx_chip && (istat & ISTAT_800_INTF))) {
        !          4390:                    char search_found = 0;      /* Got at least one ? */
        !          4391:                    done = 0;
        !          4392:                    interrupted = 1;
        !          4393: 
        !          4394:                    /* 
        !          4395:                     * Clear the INTF bit by writing a one.  
        !          4396:                     * This reset operation is self-clearing.
        !          4397:                     */
        !          4398:                    NCR53c7x0_write8(hostdata->istat, istat|ISTAT_800_INTF);
        !          4399: 
        !          4400:                    if (hostdata->options & OPTION_DEBUG_INTR)
        !          4401:                        printk ("scsi%d : INTFLY\n", host->host_no); 
        !          4402: 
        !          4403:                    /*
        !          4404:                     * Traverse our list of running commands, and look
        !          4405:                     * for those with valid (non-0xff ff) status and message
        !          4406:                     * bytes encoded in the result which signify command
        !          4407:                     * completion.
        !          4408:                     */
        !          4409: 
        !          4410: 
        !          4411:                    save_flags(flags);
        !          4412:                    cli();
        !          4413: restart:
        !          4414:                    for (cmd_prev_ptr = (struct NCR53c7x0_cmd **) 
        !          4415:                         &(hostdata->running_list), cmd = 
        !          4416:                         (struct NCR53c7x0_cmd *) hostdata->running_list; cmd ;
        !          4417:                         cmd_prev_ptr = (struct NCR53c7x0_cmd **) &(cmd->next), 
        !          4418:                         cmd = (struct NCR53c7x0_cmd *) cmd->next) {
        !          4419:                        Scsi_Cmnd *tmp;
        !          4420: 
        !          4421:                        if (!cmd) {
        !          4422:                            printk("scsi%d : very weird.\n", host->host_no);
        !          4423:                            break;
        !          4424:                        }
        !          4425: 
        !          4426:                        if (!(tmp = cmd->cmd)) {
        !          4427:                            printk("scsi%d : weird.  NCR53c7x0_cmd has no Scsi_Cmnd\n",
        !          4428:                                host->host_no);
        !          4429:                                continue;
        !          4430:                        }
        !          4431: #if 0
        !          4432:                        printk ("scsi%d : looking at result of 0x%x\n",
        !          4433:                            host->host_no, cmd->cmd->result);
        !          4434: #endif
        !          4435:                
        !          4436:                        if (((tmp->result & 0xff) == 0xff) ||
        !          4437:                            ((tmp->result & 0xff00) == 0xff00))
        !          4438:                            continue;
        !          4439: 
        !          4440:                        search_found = 1;
        !          4441: 
        !          4442:                        /* Important - remove from list _before_ done is called */
        !          4443:                        if (cmd_prev_ptr)
        !          4444:                            *cmd_prev_ptr = (struct NCR53c7x0_cmd *) cmd->next;
        !          4445: 
        !          4446:                        --hostdata->busy[tmp->target][tmp->lun];
        !          4447:                        cmd->next = hostdata->free;
        !          4448:                        hostdata->free = cmd;
        !          4449: 
        !          4450:                        tmp->host_scribble = NULL;
        !          4451: 
        !          4452:                        if (hostdata->options & OPTION_DEBUG_INTR) {
        !          4453:                            printk ("scsi%d : command complete : pid %lu, id %d,lun %d result 0x%x ", 
        !          4454:                                host->host_no, tmp->pid, tmp->target, tmp->lun, tmp->result);
        !          4455:                            print_command (tmp->cmnd);
        !          4456:                        }
        !          4457:                        
        !          4458: #if 0
        !          4459:                        hostdata->options &= ~OPTION_DEBUG_INTR;
        !          4460: #endif
        !          4461:                        tmp->scsi_done(tmp);
        !          4462:                        goto restart;
        !          4463: 
        !          4464:                    }
        !          4465:                    restore_flags(flags);
        !          4466:                   
        !          4467:     /*
        !          4468:      * I think that we're stacking INTFLY interrupts; taking care of 
        !          4469:      * all the finished commands on the first one, and then getting
        !          4470:      * worried when we see the next one.  The magic with have_intfly
        !          4471:      * should tell if this is the case..
        !          4472:      */
        !          4473:                
        !          4474:                    if (!search_found && !have_intfly)  {
        !          4475:                        printk ("scsi%d : WARNING : INTFLY with no completed commands.\n",
        !          4476:                            host->host_no);
        !          4477:                    } else if (!have_intfly)  {
        !          4478:                        have_intfly = 1; 
        !          4479:                        run_process_issue_queue();
        !          4480:                    }
        !          4481:                }
        !          4482: 
        !          4483:                if (istat & (ISTAT_SIP|ISTAT_DIP)) {
        !          4484:                    done = 0;
        !          4485:                    interrupted = 1;
        !          4486:                    hostdata->state = STATE_HALTED;
        !          4487: 
        !          4488:                    if (NCR53c7x0_read8 ((hostdata->chip / 100) == 8 ?
        !          4489:                        SSTAT1_REG : SSTAT2_REG) & SSTAT2_FF_MASK) 
        !          4490:                        printk ("scsi%d : SCSI FIFO not empty\n", 
        !          4491:                            host->host_no);
        !          4492: 
        !          4493:                    /*
        !          4494:                     * NCR53c700 and NCR53c700-66 change the current SCSI
        !          4495:                     * process, hostdata->current, in the Linux driver so
        !          4496:                     * cmd = hostdata->current.
        !          4497:                     *
        !          4498:                     * With other chips, we must look through the commands
        !          4499:                     * executing and find the command structure which 
        !          4500:                     * corresponds to the DSA register.
        !          4501:                     */
        !          4502: 
        !          4503:                    if (hostdata->options & OPTION_700) {
        !          4504:                        cmd = (struct NCR53c7x0_cmd *) hostdata->current;
        !          4505:                    } else {
        !          4506:                        dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
        !          4507:                        for (cmd = (struct NCR53c7x0_cmd *) 
        !          4508:                            hostdata->running_list; cmd &&
        !          4509:                            (dsa + (hostdata->dsa_start / sizeof(u32))) != 
        !          4510:                                cmd->dsa;
        !          4511:                            cmd = (struct NCR53c7x0_cmd *)(cmd->next));
        !          4512:                    }
        !          4513:                    if (hostdata->options & OPTION_DEBUG_INTR) {
        !          4514:                        if (cmd) {
        !          4515:                            printk("scsi%d : interrupt for pid %lu, id %d, lun %d ", 
        !          4516:                                host->host_no, cmd->cmd->pid, (int) cmd->cmd->target,
        !          4517:                                (int) cmd->cmd->lun);
        !          4518:                            print_command (cmd->cmd->cmnd);
        !          4519:                        } else {
        !          4520:                            printk("scsi%d : no active command\n", host->host_no);
        !          4521:                        }
        !          4522:                    }
        !          4523: 
        !          4524:                    if (istat & ISTAT_SIP) {
        !          4525:                        if (hostdata->options & OPTION_DEBUG_INTR) 
        !          4526:                            printk ("scsi%d : ISTAT_SIP\n", host->host_no);
        !          4527:                        intr_scsi (host, cmd);
        !          4528:                    }
        !          4529:                
        !          4530:                    if (istat & ISTAT_DIP) {
        !          4531:                        if (hostdata->options & OPTION_DEBUG_INTR) 
        !          4532:                            printk ("scsi%d : ISTAT_DIP\n", host->host_no);
        !          4533:                        intr_dma (host, cmd);
        !          4534:                    }
        !          4535: 
        !          4536:                    if (!hostdata->dstat_valid) {
        !          4537:                        hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
        !          4538:                        hostdata->dstat_valid = 1;
        !          4539:                    }
        !          4540: 
        !          4541:            /* XXX - code check for 700/800 chips */
        !          4542:                    if (!(hostdata->dstat & DSTAT_DFE)) {
        !          4543:                        printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
        !          4544:                        if (NCR53c7x0_read8 (CTEST2_REG_800) & CTEST2_800_DDIR) {
        !          4545:                            printk ("scsi%d: Flushing DMA FIFO\n", 
        !          4546:                                host->host_no);
        !          4547:                            NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_FLF);
        !          4548:                            while (!((hostdata->dstat = NCR53c7x0_read8(DSTAT_REG)) &
        !          4549:                                DSTAT_DFE));
        !          4550:                        } else 
        !          4551:                        {
        !          4552:                            NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_CLF);
        !          4553:                            while (NCR53c7x0_read8 (CTEST3_REG_800) & CTEST3_800_CLF);
        !          4554:                        }
        !          4555:                        hostdata->dstat |= DSTAT_DFE;
        !          4556:                    }
        !          4557:                }
        !          4558:            } while (interrupted);
        !          4559: 
        !          4560: 
        !          4561: 
        !          4562:            if (hostdata->intrs != -1)
        !          4563:                hostdata->intrs++;
        !          4564: #if 0
        !          4565:            if (hostdata->intrs > 40) {
        !          4566:                printk("scsi%d : too many interrupts, halting", host->host_no);
        !          4567:                disable(host);
        !          4568:            }
        !          4569: #endif
        !          4570: 
        !          4571:            if (!hostdata->idle && hostdata->state == STATE_HALTED) {
        !          4572:                if (!hostdata->dsp_changed) {
        !          4573:                    hostdata->dsp = (u32 *) 
        !          4574:                        bus_to_virt(NCR53c7x0_read32(DSP_REG));
        !          4575:                }
        !          4576:                        
        !          4577: #if 0
        !          4578:                printk("scsi%d : new dsp is 0x%lx (virt 0x%p)\n",
        !          4579:                    host->host_no,  virt_to_bus(hostdata->dsp), hostdata->dsp);
        !          4580: #endif
        !          4581:                
        !          4582:                hostdata->state = STATE_RUNNING;
        !          4583:                NCR53c7x0_write32 (DSP_REG, virt_to_bus(hostdata->dsp));
        !          4584:            }
        !          4585:        }
        !          4586:     } while (!done);
        !          4587: }
        !          4588: 
        !          4589: 
        !          4590: /* 
        !          4591:  * Function : static int abort_connected (struct Scsi_Host *host)
        !          4592:  *
        !          4593:  * Purpose : Assuming that the NCR SCSI processor is currently 
        !          4594:  *     halted, break the currently established nexus.  Clean
        !          4595:  *     up of the NCR53c7x0_cmd and Scsi_Cmnd structures should
        !          4596:  *     be done on receipt of the abort interrupt.
        !          4597:  *
        !          4598:  * Inputs : host - SCSI host
        !          4599:  *
        !          4600:  */
        !          4601: 
        !          4602: static int 
        !          4603: abort_connected (struct Scsi_Host *host) {
        !          4604: #ifdef NEW_ABORT
        !          4605:     NCR53c7x0_local_declare();
        !          4606: #endif
        !          4607:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          4608:        host->hostdata;
        !          4609: /* FIXME : this probably should change for production kernels; at the 
        !          4610:    least, counter sould move to a per-host structure. */
        !          4611:     static int counter = 5;
        !          4612: #ifdef NEW_ABORT
        !          4613:     int sstat, phase, offset;
        !          4614:     u32 *script;
        !          4615:     NCR53c7x0_local_setup(host);
        !          4616: #endif
        !          4617: 
        !          4618:     if (--counter <= 0) {
        !          4619:        disable(host);
        !          4620:        return 0;
        !          4621:     }
        !          4622: 
        !          4623:     printk ("scsi%d : DANGER : abort_connected() called \n",
        !          4624:        host->host_no);
        !          4625: 
        !          4626: #ifdef NEW_ABORT
        !          4627: 
        !          4628: /*
        !          4629:  * New strategy : Rather than using a generic abort routine,
        !          4630:  * we'll specifically try to source or sink the appropriate
        !          4631:  * amount of data for the phase we're currently in (taking into 
        !          4632:  * account the current synchronous offset) 
        !          4633:  */
        !          4634: 
        !          4635:     sstat = (NCR53c8x0_read8 ((chip / 100) == 8 ? SSTAT1_REG : SSTAT2_REG);
        !          4636:     offset = OFFSET (sstat & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT;
        !          4637:     phase = sstat & SSTAT2_PHASE_MASK;
        !          4638: 
        !          4639: /*
        !          4640:  * SET ATN
        !          4641:  * MOVE source_or_sink, WHEN CURRENT PHASE 
        !          4642:  * < repeat for each outstanding byte >
        !          4643:  * JUMP send_abort_message
        !          4644:  */
        !          4645: 
        !          4646:     script = hostdata->abort_script = kmalloc (
        !          4647:        8  /* instruction size */ * (
        !          4648:            1 /* set ATN */ +
        !          4649:            (!offset ? 1 : offset) /* One transfer per outstanding byte */ +
        !          4650:            1 /* send abort message */),
        !          4651:        GFP_ATOMIC);
        !          4652: 
        !          4653: 
        !          4654: #else /* def NEW_ABORT */
        !          4655:     hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
        !          4656:            sizeof(u32);
        !          4657: #endif /* def NEW_ABORT */
        !          4658:     hostdata->dsp_changed = 1;
        !          4659: 
        !          4660: /* XXX - need to flag the command as aborted after the abort_connected
        !          4661:         code runs 
        !          4662:  */
        !          4663:     return 0;
        !          4664: }
        !          4665: 
        !          4666: /*
        !          4667:  * Function : static int datapath_residual (Scsi_Host *host)
        !          4668:  *
        !          4669:  * Purpose : return residual data count of what's in the chip.
        !          4670:  *
        !          4671:  * Inputs : host - SCSI host
        !          4672:  */
        !          4673: 
        !          4674: static int
        !          4675: datapath_residual (struct Scsi_Host *host) {
        !          4676:     NCR53c7x0_local_declare();
        !          4677:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          4678:        host->hostdata;
        !          4679:     int count, synchronous, sstat;
        !          4680:     NCR53c7x0_local_setup(host);
        !          4681:     /* COMPAT : the 700 and 700-66 need to use DFIFO_00_BO_MASK */
        !          4682:     count = ((NCR53c7x0_read8 (DFIFO_REG) & DFIFO_10_BO_MASK) -
        !          4683:        (NCR53c7x0_read32 (DBC_REG) & DFIFO_10_BO_MASK)) & DFIFO_10_BO_MASK;
        !          4684:     synchronous = NCR53c7x0_read8 (SXFER_REG) & SXFER_MO_MASK;
        !          4685:     /* COMPAT : DDIR is elsewhere on non-'8xx chips. */
        !          4686:     if (NCR53c7x0_read8 (CTEST2_REG_800) & CTEST2_800_DDIR) {
        !          4687:     /* Receive */
        !          4688:        if (synchronous) 
        !          4689:            count += (NCR53c7x0_read8 ((hostdata->chip / 100) == 8 ? 
        !          4690:                SSTAT1_REG : SSTAT2_REG) & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT;
        !          4691:        else
        !          4692:            if (NCR53c7x0_read8 ((hostdata->chip / 100) == 8 ? 
        !          4693:                SSTAT0_REG : SSTAT1_REG) & SSTAT1_ILF)
        !          4694:                ++count;
        !          4695:     } else {
        !          4696:     /* Send */
        !          4697:        sstat = ((hostdata->chip / 100) == 8) ?  NCR53c7x0_read8 (SSTAT0_REG) :
        !          4698:            NCR53c7x0_read8 (SSTAT1_REG);
        !          4699:        if (sstat & SSTAT1_OLF)
        !          4700:            ++count;
        !          4701:        if (synchronous && (sstat & SSTAT1_ORF))
        !          4702:            ++count;
        !          4703:     }
        !          4704:     return count;
        !          4705: }
        !          4706: 
        !          4707: /* 
        !          4708:  * Function : static const char * sbcl_to_phase (int sbcl)_
        !          4709:  *
        !          4710:  * Purpose : Convert SBCL register to user-parsable phase representation
        !          4711:  *
        !          4712:  * Inputs : sbcl - value of sbcl register
        !          4713:  */
        !          4714: 
        !          4715: 
        !          4716: static const char *
        !          4717: sbcl_to_phase (int sbcl) {
        !          4718:     switch (sbcl & SBCL_PHASE_MASK) {
        !          4719:     case SBCL_PHASE_DATAIN:
        !          4720:        return "DATAIN";
        !          4721:     case SBCL_PHASE_DATAOUT:
        !          4722:        return "DATAOUT";
        !          4723:     case SBCL_PHASE_MSGIN:
        !          4724:        return "MSGIN";
        !          4725:     case SBCL_PHASE_MSGOUT:
        !          4726:        return "MSGOUT";
        !          4727:     case SBCL_PHASE_CMDOUT:
        !          4728:        return "CMDOUT";
        !          4729:     case SBCL_PHASE_STATIN:
        !          4730:        return "STATUSIN";
        !          4731:     default:
        !          4732:        return "unknown";
        !          4733:     }
        !          4734: }
        !          4735: 
        !          4736: /* 
        !          4737:  * Function : static const char * sstat2_to_phase (int sstat)_
        !          4738:  *
        !          4739:  * Purpose : Convert SSTAT2 register to user-parsable phase representation
        !          4740:  *
        !          4741:  * Inputs : sstat - value of sstat register
        !          4742:  */
        !          4743: 
        !          4744: 
        !          4745: static const char *
        !          4746: sstat2_to_phase (int sstat) {
        !          4747:     switch (sstat & SSTAT2_PHASE_MASK) {
        !          4748:     case SSTAT2_PHASE_DATAIN:
        !          4749:        return "DATAIN";
        !          4750:     case SSTAT2_PHASE_DATAOUT:
        !          4751:        return "DATAOUT";
        !          4752:     case SSTAT2_PHASE_MSGIN:
        !          4753:        return "MSGIN";
        !          4754:     case SSTAT2_PHASE_MSGOUT:
        !          4755:        return "MSGOUT";
        !          4756:     case SSTAT2_PHASE_CMDOUT:
        !          4757:        return "CMDOUT";
        !          4758:     case SSTAT2_PHASE_STATIN:
        !          4759:        return "STATUSIN";
        !          4760:     default:
        !          4761:        return "unknown";
        !          4762:     }
        !          4763: }
        !          4764: 
        !          4765: /* 
        !          4766:  * Function : static void intr_phase_mismatch (struct Scsi_Host *host, 
        !          4767:  *     struct NCR53c7x0_cmd *cmd)
        !          4768:  *
        !          4769:  * Purpose : Handle phase mismatch interrupts
        !          4770:  *
        !          4771:  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
        !          4772:  *     may be NULL.
        !          4773:  *
        !          4774:  * Side effects : The abort_connected() routine is called or the NCR chip 
        !          4775:  *     is restarted, jumping to the command_complete entry point, or 
        !          4776:  *     patching the address and transfer count of the current instruction 
        !          4777:  *     and calling the msg_in entry point as appropriate.
        !          4778:  */
        !          4779: 
        !          4780: static void 
        !          4781: intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
        !          4782:     NCR53c7x0_local_declare();
        !          4783:     u32 dbc_dcmd, *dsp, *dsp_next;
        !          4784:     unsigned char dcmd, sbcl;
        !          4785:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          4786:        host->hostdata;
        !          4787:     int residual;
        !          4788:     enum {ACTION_ABORT, ACTION_ABORT_PRINT, ACTION_CONTINUE} action = 
        !          4789:        ACTION_ABORT_PRINT;
        !          4790:     const char *where = NULL;
        !          4791:     NCR53c7x0_local_setup(host);
        !          4792: 
        !          4793:     /*
        !          4794:      * Corrective action is based on where in the SCSI SCRIPT(tm) the error 
        !          4795:      * occurred, as well as which SCSI phase we are currently in.
        !          4796:      */
        !          4797:     dsp_next = bus_to_virt(NCR53c7x0_read32(DSP_REG));
        !          4798: 
        !          4799:     /* 
        !          4800:      * Fetch the current instruction, and remove the operands for easier 
        !          4801:      * interpretation.
        !          4802:      */
        !          4803:     dbc_dcmd = NCR53c7x0_read32(DBC_REG);
        !          4804:     dcmd = (dbc_dcmd & 0xff000000) >> 24;
        !          4805:     /*
        !          4806:      * Like other processors, the NCR adjusts the instruction pointer before
        !          4807:      * instruction decode.  Set the DSP address back to what it should
        !          4808:      * be for this instruction based on its size (2 or 3 32 bit words).
        !          4809:      */
        !          4810:     dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
        !          4811: 
        !          4812: 
        !          4813:     /*
        !          4814:      * Read new SCSI phase from the SBCL lines.  Since all of our code uses 
        !          4815:      * a WHEN conditional instead of an IF conditional, we don't need to 
        !          4816:      * wait for a new REQ.
        !          4817:      */
        !          4818:     sbcl = NCR53c7x0_read8(SBCL_REG) & SBCL_PHASE_MASK;
        !          4819: 
        !          4820:     if (!cmd) {
        !          4821:        action = ACTION_ABORT_PRINT;
        !          4822:        where = "no current command";
        !          4823:     /*
        !          4824:      * The way my SCSI SCRIPTS(tm) are architected, recoverable phase
        !          4825:      * mismatches should only occur where we're doing a multi-byte  
        !          4826:      * BMI instruction.  Specifically, this means 
        !          4827:      *
        !          4828:      *  - select messages (a SCSI-I target may ignore additional messages
        !          4829:      *                 after the IDENTIFY; any target may reject a SDTR or WDTR)
        !          4830:      *
        !          4831:      *  - command out (targets may send a message to signal an error 
        !          4832:      *                 condition, or go into STATUSIN after they've decided 
        !          4833:      *         they don't like the command.
        !          4834:      *
        !          4835:      * - reply_message (targets may reject a multi-byte message in the 
        !          4836:      *         middle)
        !          4837:      *
        !          4838:      *         - data transfer routines (command completion with buffer space
        !          4839:      *         left, disconnect message, or error message)
        !          4840:      */
        !          4841:     } else if (((dsp >= cmd->data_transfer_start && 
        !          4842:        dsp < cmd->data_transfer_end)) || dsp == (cmd->residual + 2)) {
        !          4843:        if ((dcmd & (DCMD_TYPE_MASK|DCMD_BMI_OP_MASK|DCMD_BMI_INDIRECT|
        !          4844:                DCMD_BMI_MSG|DCMD_BMI_CD)) == (DCMD_TYPE_BMI|
        !          4845:                DCMD_BMI_OP_MOVE_I)) {
        !          4846:            residual = datapath_residual (host);
        !          4847:            if (hostdata->options & OPTION_DEBUG_DISCONNECT)
        !          4848:                printk ("scsi%d : handling residual transfer (+ %d bytes from DMA FIFO)\n", 
        !          4849:                    host->host_no, residual);
        !          4850: 
        !          4851:            /*
        !          4852:             * The first instruction is a CALL to the alternate handler for 
        !          4853:             * this data transfer phase, so we can do calls to 
        !          4854:             * munge_msg_restart as we would if control were passed 
        !          4855:             * from normal dynamic code.
        !          4856:             */
        !          4857:            if (dsp != cmd->residual + 2) {
        !          4858:                cmd->residual[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL |
        !          4859:                        ((dcmd & DCMD_BMI_IO) ? DCMD_TCI_IO : 0)) << 24) | 
        !          4860:                    DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE;
        !          4861:                cmd->residual[1] = virt_to_bus(hostdata->script)
        !          4862:                    + ((dcmd & DCMD_BMI_IO)
        !          4863:                       ? hostdata->E_other_in : hostdata->E_other_out);
        !          4864:            }
        !          4865: 
        !          4866:            /*
        !          4867:             * The second instruction is the a data transfer block
        !          4868:             * move instruction, reflecting the pointer and count at the 
        !          4869:             * time of the phase mismatch.
        !          4870:             */
        !          4871:            cmd->residual[2] = dbc_dcmd + residual;
        !          4872:            cmd->residual[3] = NCR53c7x0_read32(DNAD_REG) - residual;
        !          4873: 
        !          4874:            /*
        !          4875:             * The third and final instruction is a jump to the instruction
        !          4876:             * which follows the instruction which had to be 'split'
        !          4877:             */
        !          4878:            if (dsp != cmd->residual + 2) {
        !          4879:                cmd->residual[4] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) 
        !          4880:                    << 24) | DBC_TCI_TRUE;
        !          4881:                cmd->residual[5] = virt_to_bus(dsp_next);
        !          4882:            }
        !          4883: 
        !          4884:            /*
        !          4885:             * For the sake of simplicity, transfer control to the 
        !          4886:             * conditional CALL at the start of the residual buffer.
        !          4887:             */
        !          4888:            hostdata->dsp = cmd->residual;
        !          4889:            hostdata->dsp_changed = 1;
        !          4890:            action = ACTION_CONTINUE;
        !          4891:        } else {
        !          4892:            where = "non-BMI dynamic DSA code";
        !          4893:            action = ACTION_ABORT_PRINT;
        !          4894:        }
        !          4895:     } else if (dsp == (hostdata->script + hostdata->E_select_msgout / 4)) {
        !          4896:        /* Release ATN */
        !          4897:        NCR53c7x0_write8 (SOCL_REG, 0);
        !          4898:        switch (sbcl) {
        !          4899:     /* 
        !          4900:      * Some devices (SQ555 come to mind) grab the IDENTIFY message
        !          4901:      * sent on selection, and decide to go into COMMAND OUT phase
        !          4902:      * rather than accepting the rest of the messages or rejecting
        !          4903:      * them.  Handle these devices gracefully.
        !          4904:      */
        !          4905:        case SBCL_PHASE_CMDOUT:
        !          4906:            hostdata->dsp = dsp + 2 /* two _words_ */;
        !          4907:            hostdata->dsp_changed = 1;
        !          4908:            printk ("scsi%d : target %d ignored SDTR and went into COMMAND OUT\n", 
        !          4909:                host->host_no, cmd->cmd->target);
        !          4910:            cmd->flags &= ~CMD_FLAG_SDTR;
        !          4911:            action = ACTION_CONTINUE;
        !          4912:            break;
        !          4913:        case SBCL_PHASE_MSGIN:
        !          4914:            hostdata->dsp = hostdata->script + hostdata->E_msg_in / 
        !          4915:                sizeof(u32);
        !          4916:            hostdata->dsp_changed = 1;
        !          4917:            action = ACTION_CONTINUE;
        !          4918:            break;
        !          4919:        default:
        !          4920:            where="select message out";
        !          4921:            action = ACTION_ABORT_PRINT;
        !          4922:        }
        !          4923:     /*
        !          4924:      * Some SCSI devices will interpret a command as they read the bytes
        !          4925:      * off the SCSI bus, and may decide that the command is Bogus before 
        !          4926:      * they've read the entire commad off the bus.
        !          4927:      */
        !          4928:     } else if (dsp == hostdata->script + hostdata->E_cmdout_cmdout / sizeof 
        !          4929:        (u32)) {
        !          4930:        hostdata->dsp = hostdata->script + hostdata->E_data_transfer /
        !          4931:            sizeof (u32);
        !          4932:        hostdata->dsp_changed = 1;
        !          4933:        action = ACTION_CONTINUE;
        !          4934:     /* FIXME : we need to handle message reject, etc. within msg_respond. */
        !          4935: #ifdef notyet
        !          4936:     } else if (dsp == hostdata->script + hostdata->E_reply_message) {
        !          4937:        switch (sbcl) {
        !          4938:     /* Any other phase mismatches abort the currently executing command.  */
        !          4939: #endif
        !          4940:     } else {
        !          4941:        where = "unknown location";
        !          4942:        action = ACTION_ABORT_PRINT;
        !          4943:     }
        !          4944: 
        !          4945:     /* Flush DMA FIFO */
        !          4946:     if (!hostdata->dstat_valid) {
        !          4947:        hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
        !          4948:        hostdata->dstat_valid = 1;
        !          4949:     }
        !          4950:     if (!(hostdata->dstat & DSTAT_DFE)) {
        !          4951:        if (NCR53c7x0_read8 (CTEST2_REG_800) & CTEST2_800_DDIR) {
        !          4952:            printk ("scsi%d: Flushing DMA FIFO\n", 
        !          4953:                    host->host_no);
        !          4954:            NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_FLF);
        !          4955:            /* FIXME : what about stacked DMA interrupts? */
        !          4956:            while (!((hostdata->dstat = NCR53c7x0_read8(DSTAT_REG)) &
        !          4957:                DSTAT_DFE));
        !          4958:        } else {
        !          4959:            NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_CLF);
        !          4960:            while (NCR53c7x0_read8 (CTEST3_REG_800) & CTEST3_800_CLF);
        !          4961:        }
        !          4962:        hostdata->dstat |= DSTAT_DFE;
        !          4963:     }
        !          4964: 
        !          4965:     switch (action) {
        !          4966:     case ACTION_ABORT_PRINT:
        !          4967:        printk("scsi%d : %s : unexpected phase %s.\n",
        !          4968:             host->host_no, where ? where : "unknown location", 
        !          4969:             sbcl_to_phase(sbcl));
        !          4970:        print_lots (host);
        !          4971:     /* Fall through to ACTION_ABORT */
        !          4972:     case ACTION_ABORT:
        !          4973:        abort_connected (host);
        !          4974:        break;
        !          4975:     case ACTION_CONTINUE:
        !          4976:        break;
        !          4977:     }
        !          4978: 
        !          4979: #if 0
        !          4980:     if (hostdata->dsp_changed) {
        !          4981:        printk("scsi%d: new dsp 0x%p\n", host->host_no, hostdata->dsp);
        !          4982:        print_insn (host, hostdata->dsp, "", 1);
        !          4983:     }
        !          4984: #endif
        !          4985:     
        !          4986: }
        !          4987: 
        !          4988: /*
        !          4989:  * Function : static void intr_bf (struct Scsi_Host *host, 
        !          4990:  *     struct NCR53c7x0_cmd *cmd)
        !          4991:  *
        !          4992:  * Purpose : handle BUS FAULT interrupts 
        !          4993:  *
        !          4994:  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
        !          4995:  *     may be NULL.
        !          4996:  */
        !          4997: 
        !          4998: static void
        !          4999: intr_bf (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
        !          5000:     NCR53c7x0_local_declare();
        !          5001:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          5002:            host->hostdata;
        !          5003:     u32 *dsp,
        !          5004:        *next_dsp,              /* Current dsp */
        !          5005:        *dsa,
        !          5006:        dbc_dcmd;               /* DCMD (high eight bits) + DBC */
        !          5007:     unsigned short pci_status;
        !          5008:     int tmp;
        !          5009:     unsigned long flags;
        !          5010:     char *reason = NULL;
        !          5011:     /* Default behavior is for a silent error, with a retry until we've
        !          5012:        exhausted retries. */
        !          5013:     enum {MAYBE, ALWAYS, NEVER} retry = MAYBE;
        !          5014:     int report = 0;
        !          5015:     NCR53c7x0_local_setup(host);
        !          5016: 
        !          5017:     dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
        !          5018:     next_dsp = bus_to_virt (NCR53c7x0_read32(DSP_REG));
        !          5019:     dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
        !          5020: /* FIXME - check chip type  */
        !          5021:     dsa = bus_to_virt (NCR53c7x0_read32(DSA_REG));
        !          5022: 
        !          5023:     /*
        !          5024:      * Bus faults can be caused by either a Bad Address or 
        !          5025:      * Target Abort. We should check the Received Target Abort
        !          5026:      * bit of the PCI status register and Master Abort Bit.
        !          5027:      *
        !          5028:      *         - Master Abort bit indicates that no device claimed
        !          5029:      *         the address with DEVSEL within five clocks
        !          5030:      *
        !          5031:      * - Target Abort bit indicates that a target claimed it,
        !          5032:      *         but changed its mind once it saw the byte enables.
        !          5033:      *
        !          5034:      */
        !          5035: 
        !          5036:     if ((hostdata->chip / 100) == 8) {
        !          5037:        save_flags (flags);
        !          5038:        cli();
        !          5039:        tmp = pcibios_read_config_word (hostdata->pci_bus, 
        !          5040:            hostdata->pci_device_fn, PCI_STATUS, &pci_status);
        !          5041:        restore_flags (flags);
        !          5042:        if (tmp == PCIBIOS_SUCCESSFUL) {
        !          5043:            if (pci_status & PCI_STATUS_REC_TARGET_ABORT) {
        !          5044:                reason = "PCI target abort";
        !          5045:                pci_status &= ~PCI_STATUS_REC_TARGET_ABORT;
        !          5046:            } else if (pci_status & PCI_STATUS_REC_MASTER_ABORT) {
        !          5047:                reason = "No device asserted PCI DEVSEL within five bus clocks";
        !          5048:                pci_status &= ~PCI_STATUS_REC_MASTER_ABORT;
        !          5049:            } else if (pci_status & PCI_STATUS_PARITY) {
        !          5050:                report = 1;   
        !          5051:                pci_status &= ~PCI_STATUS_PARITY;
        !          5052:            }
        !          5053:        } else {
        !          5054:            printk ("scsi%d : couldn't read status register : %s\n",
        !          5055:                host->host_no, pcibios_strerror (tmp));
        !          5056:            retry = NEVER;
        !          5057:        }
        !          5058:     }
        !          5059: 
        !          5060: #ifndef notyet
        !          5061:     report = 1;
        !          5062: #endif
        !          5063:     if (report && reason) {
        !          5064:        printk(KERN_ALERT "scsi%d : BUS FAULT reason = %s\n",
        !          5065:             host->host_no, reason ? reason : "unknown");
        !          5066:        print_lots (host);
        !          5067:     }
        !          5068: 
        !          5069: #ifndef notyet
        !          5070:     retry = NEVER;
        !          5071: #endif
        !          5072: 
        !          5073:     /* 
        !          5074:      * TODO : we should attempt to recover from any spurious bus 
        !          5075:      * faults.  After X retries, we should figure that things are 
        !          5076:      * sufficiently wedged, and call NCR53c7xx_reset.
        !          5077:      *
        !          5078:      * This code should only get executed once we've decided that we 
        !          5079:      * cannot retry.
        !          5080:      */
        !          5081: 
        !          5082:     if (retry == NEVER) {
        !          5083:        printk(KERN_ALERT "          mail [email protected]\n");
        !          5084:        FATAL (host);
        !          5085:     }
        !          5086: }
        !          5087: 
        !          5088: /*
        !          5089:  * Function : static void intr_dma (struct Scsi_Host *host, 
        !          5090:  *     struct NCR53c7x0_cmd *cmd)
        !          5091:  *
        !          5092:  * Purpose : handle all DMA interrupts, indicated by the setting 
        !          5093:  *     of the DIP bit in the ISTAT register.
        !          5094:  *
        !          5095:  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
        !          5096:  *     may be NULL.
        !          5097:  */
        !          5098: 
        !          5099: static void 
        !          5100: intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
        !          5101:     NCR53c7x0_local_declare();
        !          5102:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          5103:        host->hostdata;
        !          5104:     unsigned char dstat;       /* DSTAT */     
        !          5105:     u32 *dsp,
        !          5106:        *next_dsp,              /* Current dsp */
        !          5107:        *dsa,
        !          5108:        dbc_dcmd;               /* DCMD (high eight bits) + DBC */
        !          5109:     int tmp;
        !          5110:     unsigned long flags;
        !          5111:     NCR53c7x0_local_setup(host);
        !          5112: 
        !          5113:     if (!hostdata->dstat_valid) {
        !          5114:        hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
        !          5115:        hostdata->dstat_valid = 1;
        !          5116:     }
        !          5117:     
        !          5118:     dstat = hostdata->dstat;
        !          5119:     
        !          5120:     if (hostdata->options & OPTION_DEBUG_INTR)
        !          5121:        printk("scsi%d : DSTAT=0x%x\n", host->host_no, (int) dstat);
        !          5122: 
        !          5123:     dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
        !          5124:     next_dsp = bus_to_virt(NCR53c7x0_read32(DSP_REG));
        !          5125:     dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
        !          5126: /* XXX - check chip type */
        !          5127:     dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
        !          5128: 
        !          5129:     /*
        !          5130:      * DSTAT_ABRT is the aborted interrupt.  This is set whenever the 
        !          5131:      * SCSI chip is aborted.  
        !          5132:      * 
        !          5133:      * With NCR53c700 and NCR53c700-66 style chips, we should only 
        !          5134:      * get this when the chip is currently running the accept 
        !          5135:      * reselect/select code and we have set the abort bit in the 
        !          5136:      * ISTAT register.
        !          5137:      *
        !          5138:      */
        !          5139:     
        !          5140:     if (dstat & DSTAT_ABRT) {
        !          5141: #if 0
        !          5142:        /* XXX - add code here to deal with normal abort */
        !          5143:        if ((hostdata->options & OPTION_700) && (hostdata->state ==
        !          5144:            STATE_ABORTING)) {
        !          5145:        } else 
        !          5146: #endif
        !          5147:        {
        !          5148:            printk(KERN_ALERT "scsi%d : unexpected abort interrupt at\n" 
        !          5149:                   "         ", host->host_no);
        !          5150:            print_insn (host, dsp, KERN_ALERT "s ", 1);
        !          5151:            FATAL (host);
        !          5152:        }
        !          5153:     }
        !          5154: 
        !          5155:     /*
        !          5156:      * DSTAT_SSI is the single step interrupt.  Should be generated 
        !          5157:      * whenever we have single stepped or are tracing.
        !          5158:      */
        !          5159: 
        !          5160:     if (dstat & DSTAT_SSI) {
        !          5161:        if (hostdata->options & OPTION_DEBUG_TRACE) {
        !          5162:        } else if (hostdata->options & OPTION_DEBUG_SINGLE) {
        !          5163:            print_insn (host, dsp, "s ", 0);
        !          5164:            save_flags(flags);
        !          5165:            cli();
        !          5166: /* XXX - should we do this, or can we get away with writing dsp? */
        !          5167: 
        !          5168:            NCR53c7x0_write8 (DCNTL_REG, (NCR53c7x0_read8(DCNTL_REG) & 
        !          5169:                ~DCNTL_SSM) | DCNTL_STD);
        !          5170:            restore_flags(flags);
        !          5171:        } else {
        !          5172:            printk(KERN_ALERT "scsi%d : unexpected single step interrupt at\n"
        !          5173:                   "         ", host->host_no);
        !          5174:            print_insn (host, dsp, KERN_ALERT "", 1);
        !          5175:            printk(KERN_ALERT "         mail [email protected]\n");
        !          5176:            FATAL (host);
        !          5177:        }
        !          5178:     }
        !          5179: 
        !          5180:     /*
        !          5181:      * DSTAT_IID / DSTAT_OPC (same bit, same meaning, only the name 
        !          5182:      * is different) is generated whenever an illegal instruction is 
        !          5183:      * encountered.  
        !          5184:      * 
        !          5185:      * XXX - we may want to emulate INTFLY here, so we can use 
        !          5186:      *    the same SCSI SCRIPT (tm) for NCR53c710 through NCR53c810  
        !          5187:      *   chips.
        !          5188:      */
        !          5189: 
        !          5190:     if (dstat & DSTAT_OPC) {
        !          5191:     /* 
        !          5192:      * Ascertain if this IID interrupts occurred before or after a STO 
        !          5193:      * interrupt.  Since the interrupt handling code now leaves 
        !          5194:      * DSP unmodified until _after_ all stacked interrupts have been
        !          5195:      * processed, reading the DSP returns the original DSP register.
        !          5196:      * This means that if dsp lies between the select code, and 
        !          5197:      * message out following the selection code (where the IID interrupt
        !          5198:      * would have to have occurred by due to the implicit wait for REQ),
        !          5199:      * we have an IID interrupt resulting from a STO condition and 
        !          5200:      * can ignore it.
        !          5201:      */
        !          5202: 
        !          5203:        if (((dsp >= (hostdata->script + hostdata->E_select / sizeof(u32))) &&
        !          5204:            (dsp <= (hostdata->script + hostdata->E_select_msgout / 
        !          5205:            sizeof(u32) + 8))) || (hostdata->test_running == 2)) {
        !          5206:            if (hostdata->options & OPTION_DEBUG_INTR) 
        !          5207:                printk ("scsi%d : ignoring DSTAT_IID for SSTAT_STO\n",
        !          5208:                    host->host_no);
        !          5209:            if (hostdata->expecting_iid) {
        !          5210:                hostdata->expecting_iid = 0;
        !          5211:                hostdata->idle = 1;
        !          5212:                if (hostdata->test_running == 2) {
        !          5213:                    hostdata->test_running = 0;
        !          5214:                    hostdata->test_completed = 3;
        !          5215:                } else if (cmd) 
        !          5216:                        abnormal_finished (cmd, DID_BAD_TARGET << 16);
        !          5217:            } else {
        !          5218:                hostdata->expecting_sto = 1;
        !          5219:            }
        !          5220:     /*
        !          5221:      * We can't guarantee we'll be able to execute the WAIT DISCONNECT
        !          5222:      * instruction within the 3.4us of bus free and arbitration delay
        !          5223:      * that a target can RESELECT in and assert REQ after we've dropped
        !          5224:      * ACK.  If this happens, we'll get an illegal instruction interrupt.
        !          5225:      * Doing away with the WAIT DISCONNECT instructions broke everything,
        !          5226:      * so instead I'll settle for moving one WAIT DISCONNECT a few 
        !          5227:      * instructions closer to the CLEAR ACK before it to minimize the
        !          5228:      * chances of this happening, and handle it if it occurs anyway.
        !          5229:      *
        !          5230:      * Simply continue with what we were doing, and control should
        !          5231:      * be transfered to the schedule routine which will ultimately
        !          5232:      * pass control onto the reselection or selection (not yet)
        !          5233:      * code.
        !          5234:      */
        !          5235:        } else if (dbc_dcmd == 0x48000000 && (NCR53c7x0_read8 (SBCL_REG) &
        !          5236:            SBCL_REQ)) {
        !          5237:            if (!(hostdata->options & OPTION_NO_PRINT_RACE))
        !          5238:            {
        !          5239:                printk("scsi%d: REQ before WAIT DISCONNECT IID\n", 
        !          5240:                    host->host_no);
        !          5241:                hostdata->options |= OPTION_NO_PRINT_RACE;
        !          5242:            }
        !          5243:        } else {
        !          5244:            printk(KERN_ALERT "scsi%d : illegal instruction\n", host->host_no);
        !          5245:            print_lots (host);
        !          5246:            printk(KERN_ALERT "         mail [email protected] with ALL\n"
        !          5247:                              "         boot messages and diagnostic output\n");
        !          5248:            FATAL (host);
        !          5249:        }
        !          5250:     }
        !          5251: 
        !          5252:     /* 
        !          5253:      * DSTAT_BF are bus fault errors
        !          5254:      */
        !          5255:     
        !          5256:     if (dstat & DSTAT_800_BF) {
        !          5257:        intr_bf (host, cmd);
        !          5258:     }
        !          5259:        
        !          5260: 
        !          5261:     /* 
        !          5262:      * DSTAT_SIR interrupts are generated by the execution of 
        !          5263:      * the INT instruction.  Since the exact values available 
        !          5264:      * are determined entirely by the SCSI script running, 
        !          5265:      * and are local to a particular script, a unique handler
        !          5266:      * is called for each script.
        !          5267:      */
        !          5268: 
        !          5269:     if (dstat & DSTAT_SIR) {
        !          5270:        if (hostdata->options & OPTION_DEBUG_INTR)
        !          5271:            printk ("scsi%d : DSTAT_SIR\n", host->host_no);
        !          5272:        switch ((tmp = hostdata->dstat_sir_intr (host, cmd))) {
        !          5273:        case SPECIFIC_INT_NOTHING:
        !          5274:        case SPECIFIC_INT_RESTART:
        !          5275:            break;
        !          5276:        case SPECIFIC_INT_ABORT:
        !          5277:            abort_connected(host);
        !          5278:            break;
        !          5279:        case SPECIFIC_INT_PANIC:
        !          5280:            printk(KERN_ALERT "scsi%d : failure at ", host->host_no);
        !          5281:            print_insn (host, dsp, KERN_ALERT "", 1);
        !          5282:            printk(KERN_ALERT "          dstat_sir_intr() returned SPECIFIC_INT_PANIC\n");
        !          5283:            FATAL (host);
        !          5284:            break;
        !          5285:        case SPECIFIC_INT_BREAK:
        !          5286:            intr_break (host, cmd);
        !          5287:            break;
        !          5288:        default:
        !          5289:            printk(KERN_ALERT "scsi%d : failure at ", host->host_no);
        !          5290:            print_insn (host, dsp, KERN_ALERT "", 1);
        !          5291:            printk(KERN_ALERT"          dstat_sir_intr() returned unknown value %d\n", 
        !          5292:                tmp);
        !          5293:            FATAL (host);
        !          5294:        }
        !          5295:     } 
        !          5296: 
        !          5297:     if ((hostdata->chip / 100) == 8 && (dstat & DSTAT_800_MDPE)) {
        !          5298:        printk(KERN_ALERT "scsi%d : Master Data Parity Error\n",
        !          5299:            host->host_no);
        !          5300:        FATAL (host);
        !          5301:     }
        !          5302: }
        !          5303: 
        !          5304: /*
        !          5305:  * Function : static int print_insn (struct Scsi_Host *host, 
        !          5306:  *     u32 *insn, int kernel)
        !          5307:  *
        !          5308:  * Purpose : print numeric representation of the instruction pointed
        !          5309:  *     to by insn to the debugging or kernel message buffer
        !          5310:  *     as appropriate.  
        !          5311:  *
        !          5312:  *     If desired, a user level program can interpret this 
        !          5313:  *     information.
        !          5314:  *
        !          5315:  * Inputs : host, insn - host, pointer to instruction, prefix - 
        !          5316:  *     string to prepend, kernel - use printk instead of debugging buffer.
        !          5317:  *
        !          5318:  * Returns : size, in u32s, of instruction printed.
        !          5319:  */
        !          5320: 
        !          5321: /*
        !          5322:  * FIXME: should change kernel parameter so that it takes an ENUM
        !          5323:  *     specifying severity - either KERN_ALERT or KERN_PANIC so
        !          5324:  *     all panic messages are output with the same severity.
        !          5325:  */
        !          5326: 
        !          5327: static int 
        !          5328: print_insn (struct Scsi_Host *host, const u32 *insn, 
        !          5329:     const char *prefix, int kernel) {
        !          5330:     char buf[160],             /* Temporary buffer and pointer.  ICKY 
        !          5331:                                   arbitrary length.  */
        !          5332: 
        !          5333:                
        !          5334:        *tmp;                   
        !          5335:     unsigned char dcmd;                /* dcmd register for *insn */
        !          5336:     int size;
        !          5337: 
        !          5338:     /* 
        !          5339:      * Check to see if the instruction pointer is not bogus before 
        !          5340:      * indirecting through it; avoiding red-zone at start of 
        !          5341:      * memory.
        !          5342:      *
        !          5343:      * FIXME: icky magic needs to happen here on non-intel boxes which
        !          5344:      * don't have kernel memory mapped in like this.  Might be reasonable
        !          5345:      * to use vverify()?
        !          5346:      */
        !          5347: 
        !          5348:     if (MAP_NR(insn) < 1 || MAP_NR(insn + 8) > MAP_NR(high_memory) || 
        !          5349:        ((((dcmd = (insn[0] >> 24) & 0xff) & DCMD_TYPE_MMI) == DCMD_TYPE_MMI) &&
        !          5350:        MAP_NR(insn + 12) > MAP_NR(high_memory))) {
        !          5351:        size = 0;
        !          5352:        sprintf (buf, "%s%p: address out of range\n",
        !          5353:            prefix, insn);
        !          5354:     } else {
        !          5355: /* 
        !          5356:  * FIXME : (void *) cast in virt_to_bus should be unecessary, because
        !          5357:  *     it should take const void * as argument.
        !          5358:  */
        !          5359:        sprintf(buf, "%s0x%lx (virt 0x%p) : 0x%08x 0x%08x (virt 0x%p)", 
        !          5360:            (prefix ? prefix : ""), virt_to_bus((void *) insn), insn,  
        !          5361:            insn[0], insn[1], bus_to_virt (insn[1]));
        !          5362:        tmp = buf + strlen(buf);
        !          5363:        if ((dcmd & DCMD_TYPE_MASK) == DCMD_TYPE_MMI)  {
        !          5364:            sprintf (tmp, " 0x%08x (virt 0x%p)\n", insn[2], 
        !          5365:                bus_to_virt(insn[2]));
        !          5366:            size = 3;
        !          5367:        } else {
        !          5368:            sprintf (tmp, "\n");
        !          5369:            size = 2;
        !          5370:        }
        !          5371:     }
        !          5372: 
        !          5373:     if (kernel) 
        !          5374:        printk ("%s", buf);
        !          5375: #ifdef NCR_DEBUG
        !          5376:     else {
        !          5377:        size_t len = strlen(buf);
        !          5378:        debugger_kernel_write(host, buf, len);
        !          5379:     }
        !          5380: #endif
        !          5381:     return size;
        !          5382: }
        !          5383: 
        !          5384: /*
        !          5385:  * Function : static const char *ncr_state (int state)
        !          5386:  *
        !          5387:  * Purpose : convert state (probably from hostdata->state) to a string
        !          5388:  *
        !          5389:  * Inputs : state
        !          5390:  *
        !          5391:  * Returns : char * representation of state, "unknown" on error.
        !          5392:  */
        !          5393: 
        !          5394: static const char *
        !          5395: ncr_state (int state) {
        !          5396:     switch (state) {
        !          5397:     case STATE_HALTED: return "halted";
        !          5398:     case STATE_WAITING: return "waiting";
        !          5399:     case STATE_RUNNING: return "running";
        !          5400:     case STATE_ABORTING: return "aborting";
        !          5401:     case STATE_DISABLED: return "disabled";
        !          5402:     default: return "unknown";
        !          5403:     }
        !          5404: }
        !          5405: 
        !          5406: /*
        !          5407:  * Function : int NCR53c7xx_abort (Scsi_Cmnd *cmd)
        !          5408:  * 
        !          5409:  * Purpose : Abort an errant SCSI command, doing all necessary
        !          5410:  *     cleanup of the issue_queue, running_list, shared Linux/NCR
        !          5411:  *     dsa issue and reconnect queues.
        !          5412:  *
        !          5413:  * Inputs : cmd - command to abort, code - entire result field
        !          5414:  *
        !          5415:  * Returns : 0 on success, -1 on failure.
        !          5416:  */
        !          5417: 
        !          5418: int 
        !          5419: NCR53c7xx_abort (Scsi_Cmnd *cmd) {
        !          5420:     NCR53c7x0_local_declare();
        !          5421:     struct Scsi_Host *host = cmd->host;
        !          5422:     struct NCR53c7x0_hostdata *hostdata = host ? (struct NCR53c7x0_hostdata *) 
        !          5423:        host->hostdata : NULL;
        !          5424:     unsigned long flags;
        !          5425:     struct NCR53c7x0_cmd *curr, **prev;
        !          5426:     Scsi_Cmnd *me, **last;
        !          5427: #if 0
        !          5428:     static long cache_pid = -1;
        !          5429: #endif
        !          5430: 
        !          5431: 
        !          5432:     if (!host) {
        !          5433:        printk ("Bogus SCSI command pid %ld; no host structure\n",
        !          5434:            cmd->pid);
        !          5435:        return SCSI_ABORT_ERROR;
        !          5436:     } else if (!hostdata) {
        !          5437:        printk ("Bogus SCSI host %d; no hostdata\n", host->host_no);
        !          5438:        return SCSI_ABORT_ERROR;
        !          5439:     }
        !          5440:     NCR53c7x0_local_setup(host);
        !          5441: 
        !          5442: /*
        !          5443:  * CHECK : I don't think that reading ISTAT will unstack any interrupts,
        !          5444:  *     since we need to write the INTF bit to clear it, and SCSI/DMA
        !          5445:  *     interrupts don't clear until we read SSTAT/SIST and DSTAT registers.
        !          5446:  *     
        !          5447:  *     See that this is the case.
        !          5448:  *
        !          5449:  * I suspect that several of our failures may be coming from a new fatal
        !          5450:  * interrupt (possibly due to a phase mismatch) happening after we've left
        !          5451:  * the interrupt handler, but before the PIC has had the interrupt condition
        !          5452:  * cleared.
        !          5453:  */
        !          5454: 
        !          5455:     if (NCR53c7x0_read8(hostdata->istat) & 
        !          5456:        (ISTAT_DIP|ISTAT_SIP|
        !          5457:            (hostdata->chip / 100 == 8 ? ISTAT_800_INTF : 0))) {
        !          5458:        printk ("scsi%d : dropped interrupt for command %ld\n", host->host_no,
        !          5459:            cmd->pid);
        !          5460:        NCR53c7x0_intr (host->irq, NULL);
        !          5461:        return SCSI_ABORT_BUSY;
        !          5462:     }
        !          5463:        
        !          5464:     save_flags(flags);
        !          5465:     cli();
        !          5466: #if 0
        !          5467:     if (cache_pid == cmd->pid) 
        !          5468:        panic ("scsi%d : bloody fetus %d\n", host->host_no, cmd->pid);
        !          5469:     else
        !          5470:        cache_pid = cmd->pid;
        !          5471: #endif
        !          5472:        
        !          5473: 
        !          5474: /*
        !          5475:  * The command could be hiding in the issue_queue.  This would be very
        !          5476:  * nice, as commands can't be moved from the high level driver's issue queue 
        !          5477:  * into the shared queue until an interrupt routine is serviced, and this
        !          5478:  * moving is atomic.  
        !          5479:  *
        !          5480:  * If this is the case, we don't have to worry about anything - we simply
        !          5481:  * pull the command out of the old queue, and call it aborted.
        !          5482:  */
        !          5483: 
        !          5484:     for (me = (Scsi_Cmnd *) hostdata->issue_queue, 
        !          5485:          last = (Scsi_Cmnd **) &(hostdata->issue_queue);
        !          5486:         me && me != cmd;  last = (Scsi_Cmnd **)&(me->SCp.ptr), 
        !          5487:         me = (Scsi_Cmnd *)me->SCp.ptr);
        !          5488: 
        !          5489:     if (me) {
        !          5490:        *last = (Scsi_Cmnd *) me->SCp.ptr;
        !          5491:        if (me->host_scribble) {
        !          5492:            ((struct NCR53c7x0_cmd *)me->host_scribble)->next = hostdata->free;
        !          5493:            hostdata->free = (struct NCR53c7x0_cmd *) me->host_scribble;
        !          5494:            me->host_scribble = NULL;
        !          5495:        }
        !          5496:        cmd->result = DID_ABORT << 16;
        !          5497:        cmd->scsi_done(cmd);
        !          5498:        printk ("scsi%d : found command %ld in Linux issue queue\n", 
        !          5499:            host->host_no, me->pid);
        !          5500:        restore_flags(flags);
        !          5501:        run_process_issue_queue();
        !          5502:        return SCSI_ABORT_SUCCESS;
        !          5503:     }
        !          5504: 
        !          5505: /* 
        !          5506:  * That failing, the command could be in our list of already executing 
        !          5507:  * commands.  If this is the case, drastic measures are called for.  
        !          5508:  */ 
        !          5509: 
        !          5510:     for (curr = (struct NCR53c7x0_cmd *) hostdata->running_list, 
        !          5511:         prev = (struct NCR53c7x0_cmd **) &(hostdata->running_list);
        !          5512:         curr && curr->cmd != cmd; prev = (struct NCR53c7x0_cmd **) 
        !          5513:          &(curr->next), curr = (struct NCR53c7x0_cmd *) curr->next);
        !          5514: 
        !          5515:     if (curr) {
        !          5516:        if ((cmd->result & 0xff) != 0xff && (cmd->result & 0xff00) != 0xff00) {
        !          5517:            if (prev)
        !          5518:                *prev = (struct NCR53c7x0_cmd *) curr->next;
        !          5519:            curr->next = (struct NCR53c7x0_cmd *) hostdata->free;
        !          5520:            cmd->host_scribble = NULL;
        !          5521:            hostdata->free = curr;
        !          5522:            cmd->scsi_done(cmd);
        !          5523:        printk ("scsi%d : found finished command %ld in running list\n", 
        !          5524:            host->host_no, cmd->pid);
        !          5525:            restore_flags(flags);
        !          5526:            return SCSI_ABORT_NOT_RUNNING;
        !          5527:        } else {
        !          5528:            printk ("scsi%d : DANGER : command running, can not abort.\n",
        !          5529:                cmd->host->host_no);
        !          5530:            restore_flags(flags);
        !          5531:            return SCSI_ABORT_BUSY;
        !          5532:        }
        !          5533:     }
        !          5534: 
        !          5535: /* 
        !          5536:  * And if we couldn't find it in any of our queues, it must have been 
        !          5537:  * a dropped interrupt.
        !          5538:  */
        !          5539: 
        !          5540:     curr = (struct NCR53c7x0_cmd *) cmd->host_scribble;
        !          5541:     if (curr) {
        !          5542:        curr->next = hostdata->free;
        !          5543:        hostdata->free = curr;
        !          5544:        cmd->host_scribble = NULL;
        !          5545:     }
        !          5546: 
        !          5547:     if (((cmd->result & 0xff00) == 0xff00) ||
        !          5548:        ((cmd->result & 0xff) == 0xff)) {
        !          5549:        printk ("scsi%d : did this command ever run?\n", host->host_no);
        !          5550:        cmd->result = DID_ABORT << 16;
        !          5551:     } else {
        !          5552:        printk ("scsi%d : probably lost INTFLY, normal completion\n", 
        !          5553:            host->host_no);
        !          5554: /* 
        !          5555:  * FIXME : We need to add an additional flag which indicates if a 
        !          5556:  * command was ever counted as BUSY, so if we end up here we can
        !          5557:  * decrement the busy count if and only if it is necessary.
        !          5558:  */
        !          5559:         --hostdata->busy[cmd->target][cmd->lun];
        !          5560:     }
        !          5561:     restore_flags(flags);
        !          5562:     cmd->scsi_done(cmd);
        !          5563: 
        !          5564: /* 
        !          5565:  * We need to run process_issue_queue since termination of this command 
        !          5566:  * may allow another queued command to execute first? 
        !          5567:  */
        !          5568:     return SCSI_ABORT_NOT_RUNNING;
        !          5569: }
        !          5570: 
        !          5571: /*
        !          5572:  * Function : int NCR53c7xx_reset (Scsi_Cmnd *cmd) 
        !          5573:  * 
        !          5574:  * Purpose : perform a hard reset of the SCSI bus and NCR
        !          5575:  *     chip.
        !          5576:  *
        !          5577:  * Inputs : cmd - command which caused the SCSI RESET
        !          5578:  *
        !          5579:  * Returns : 0 on success.
        !          5580:  */
        !          5581:  
        !          5582: int 
        !          5583: NCR53c7xx_reset (Scsi_Cmnd *cmd) {
        !          5584:     NCR53c7x0_local_declare();
        !          5585:     unsigned long flags;
        !          5586:     int found = 0;
        !          5587:     struct NCR53c7x0_cmd * c;
        !          5588:     Scsi_Cmnd *tmp;
        !          5589:     /*
        !          5590:      * When we call scsi_done(), it's going to wake up anything sleeping on the
        !          5591:      * resources which were in use by the aborted commands, and we'll start to 
        !          5592:      * get new commands.
        !          5593:      *
        !          5594:      * We can't let this happen until after we've re-initialized the driver
        !          5595:      * structures, and can't reinitilize those structures until after we've 
        !          5596:      * dealt with their contents.
        !          5597:      *
        !          5598:      * So, we need to find all of the commands which were running, stick
        !          5599:      * them on a linked list of completed commands (we'll use the host_scribble
        !          5600:      * pointer), do our reinitialization, and then call the done function for
        !          5601:      * each command.  
        !          5602:      */
        !          5603:     Scsi_Cmnd *nuke_list = NULL;
        !          5604:     struct Scsi_Host *host = cmd->host;
        !          5605:     struct NCR53c7x0_hostdata *hostdata = 
        !          5606:        (struct NCR53c7x0_hostdata *) host->hostdata;
        !          5607: 
        !          5608:     NCR53c7x0_local_setup(host);
        !          5609:     save_flags(flags);
        !          5610:     cli();
        !          5611:     ncr_halt (host);
        !          5612:     print_lots (host);
        !          5613:     dump_events (host, 30);
        !          5614:     ncr_scsi_reset (host);
        !          5615:     for (tmp = nuke_list = return_outstanding_commands (host, 1 /* free */,
        !          5616:        0 /* issue */ ); tmp; tmp = (Scsi_Cmnd *) tmp->SCp.buffer)
        !          5617:        if (tmp == cmd) {
        !          5618:            found = 1;
        !          5619:            break;
        !          5620:        }
        !          5621:            
        !          5622:     /* 
        !          5623:      * If we didn't find the command which caused this reset in our running
        !          5624:      * list, then we've lost it.  See that it terminates normally anyway.
        !          5625:      */
        !          5626:     if (!found) {
        !          5627:        c = (struct NCR53c7x0_cmd *) cmd->host_scribble;
        !          5628:        if (c) {
        !          5629:            cmd->host_scribble = NULL;
        !          5630:            c->next = hostdata->free;
        !          5631:            hostdata->free = c;
        !          5632:        } else
        !          5633:            printk ("scsi%d: lost command %ld\n", host->host_no, cmd->pid);
        !          5634:        cmd->SCp.buffer = (struct scatterlist *) nuke_list;
        !          5635:        nuke_list = cmd;
        !          5636:     }
        !          5637: 
        !          5638:     NCR53c7x0_driver_init (host);
        !          5639:     hostdata->soft_reset (host);
        !          5640:     if (hostdata->resets == 0) 
        !          5641:        disable(host);
        !          5642:     else if (hostdata->resets != -1)
        !          5643:        --hostdata->resets;
        !          5644:     sti();
        !          5645:     for (; nuke_list; nuke_list = tmp) {
        !          5646:        tmp = (Scsi_Cmnd *) nuke_list->SCp.buffer;
        !          5647:        nuke_list->result = DID_RESET << 16;
        !          5648:        nuke_list->scsi_done (nuke_list);
        !          5649:     }
        !          5650:     restore_flags(flags);
        !          5651:     return SCSI_RESET_SUCCESS;
        !          5652: }
        !          5653: 
        !          5654: /*
        !          5655:  * The NCR SDMS bios follows Annex A of the SCSI-CAM draft, and 
        !          5656:  * therefore shares the scsicam_bios_param function.
        !          5657:  */
        !          5658: 
        !          5659: /*
        !          5660:  * Function : int insn_to_offset (Scsi_Cmnd *cmd, u32 *insn)
        !          5661:  *
        !          5662:  * Purpose : convert instructions stored at NCR pointer into data 
        !          5663:  *     pointer offset.
        !          5664:  * 
        !          5665:  * Inputs : cmd - SCSI command; insn - pointer to instruction.  Either current
        !          5666:  *     DSP, or saved data pointer.
        !          5667:  *
        !          5668:  * Returns : offset on success, -1 on failure.
        !          5669:  */
        !          5670: 
        !          5671: 
        !          5672: static int 
        !          5673: insn_to_offset (Scsi_Cmnd *cmd, u32 *insn) {
        !          5674:     struct NCR53c7x0_hostdata *hostdata = 
        !          5675:        (struct NCR53c7x0_hostdata *) cmd->host->hostdata;
        !          5676:     struct NCR53c7x0_cmd *ncmd = 
        !          5677:        (struct NCR53c7x0_cmd *) cmd->host_scribble;
        !          5678:     int offset = 0, buffers;
        !          5679:     struct scatterlist *segment;
        !          5680:     char *ptr;
        !          5681:     int found = 0;
        !          5682: 
        !          5683: /*
        !          5684:  * With the current code implementation, if the insn is inside dynamically 
        !          5685:  * generated code, the data pointer will be the instruction preceeding 
        !          5686:  * the next transfer segment.
        !          5687:  */
        !          5688: 
        !          5689:     if (!check_address ((unsigned long) ncmd, sizeof (struct NCR53c7x0_cmd)) &&
        !          5690:        ((insn >= ncmd->data_transfer_start &&  
        !          5691:            insn < ncmd->data_transfer_end) ||
        !          5692:        (insn >= ncmd->residual &&
        !          5693:            insn < (ncmd->residual + 
        !          5694:                sizeof(ncmd->residual))))) {
        !          5695:            ptr = bus_to_virt(insn[3]);
        !          5696: 
        !          5697:            if ((buffers = cmd->use_sg)) {
        !          5698:                for (offset = 0, 
        !          5699:                        segment = (struct scatterlist *) cmd->buffer;
        !          5700:                     buffers && !((found = ((ptr >= segment->address) && 
        !          5701:                            (ptr < (segment->address + segment->length)))));
        !          5702:                     --buffers, offset += segment->length, ++segment)
        !          5703: #if 0
        !          5704:                    printk("scsi%d: comparing 0x%p to 0x%p\n", 
        !          5705:                        cmd->host->host_no, saved, segment->address);
        !          5706: #else
        !          5707:                    ;
        !          5708: #endif
        !          5709:                    offset += ptr - segment->address;
        !          5710:            } else {
        !          5711:                found = 1;
        !          5712:                offset = ptr - (char *) (cmd->request_buffer);
        !          5713:            }
        !          5714:     } else if ((insn >= hostdata->script + 
        !          5715:                hostdata->E_data_transfer / sizeof(u32)) &&
        !          5716:               (insn <= hostdata->script +
        !          5717:                hostdata->E_end_data_transfer / sizeof(u32))) {
        !          5718:        found = 1;
        !          5719:        offset = 0;
        !          5720:     }
        !          5721:     return found ? offset : -1;
        !          5722: }
        !          5723: 
        !          5724: 
        !          5725: 
        !          5726: /*
        !          5727:  * Function : void print_progress (Scsi_Cmnd *cmd) 
        !          5728:  * 
        !          5729:  * Purpose : print the current location of the saved data pointer
        !          5730:  *
        !          5731:  * Inputs : cmd - command we are interested in
        !          5732:  *
        !          5733:  */
        !          5734: 
        !          5735: static void 
        !          5736: print_progress (Scsi_Cmnd *cmd) {
        !          5737:     NCR53c7x0_local_declare();
        !          5738:     struct NCR53c7x0_cmd *ncmd = 
        !          5739:        (struct NCR53c7x0_cmd *) cmd->host_scribble;
        !          5740:     int offset, i;
        !          5741:     char *where;
        !          5742:     u32 *ptr;
        !          5743:     NCR53c7x0_local_setup (cmd->host);
        !          5744:     for (i = 0; i < 2; ++i) {
        !          5745:        if (check_address ((unsigned long) ncmd, 
        !          5746:            sizeof (struct NCR53c7x0_cmd)) == -1) 
        !          5747:            continue;
        !          5748:        if (!i) {
        !          5749:            where = "saved";
        !          5750:            ptr = bus_to_virt(ncmd->saved_data_pointer);
        !          5751:        } else {
        !          5752:            where = "active";
        !          5753:            ptr = bus_to_virt (NCR53c7x0_read32 (DSP_REG) -
        !          5754:                NCR53c7x0_insn_size (NCR53c7x0_read8 (DCMD_REG)) *
        !          5755:                sizeof(u32));
        !          5756:        } 
        !          5757:        offset = insn_to_offset (cmd, ptr);
        !          5758: 
        !          5759:        if (offset != -1) 
        !          5760:            printk ("scsi%d : %s data pointer at offset %d\n",
        !          5761:                cmd->host->host_no, where, offset);
        !          5762:        else {
        !          5763:            int size;
        !          5764:            printk ("scsi%d : can't determine %s data pointer offset\n",
        !          5765:                cmd->host->host_no, where);
        !          5766:            if (ncmd) {
        !          5767:                size = print_insn (cmd->host, 
        !          5768:                    bus_to_virt(ncmd->saved_data_pointer), "", 1);
        !          5769:                print_insn (cmd->host, 
        !          5770:                    bus_to_virt(ncmd->saved_data_pointer) + size * sizeof(u32),
        !          5771:                    "", 1);
        !          5772:            }
        !          5773:        }
        !          5774:     }
        !          5775: }
        !          5776: 
        !          5777: 
        !          5778: static void 
        !          5779: print_dsa (struct Scsi_Host *host, u32 *dsa, const char *prefix) {
        !          5780:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          5781:        host->hostdata;
        !          5782:     int i, len;
        !          5783:     char *ptr;
        !          5784:     Scsi_Cmnd *cmd;
        !          5785: 
        !          5786:     if (check_address ((unsigned long) dsa, hostdata->dsa_end - 
        !          5787:        hostdata->dsa_start) == -1) {
        !          5788:        printk("scsi%d : bad dsa virt 0x%p\n", host->host_no, dsa);
        !          5789:        return;
        !          5790:     }
        !          5791:     printk("%sscsi%d : dsa at phys 0x%lx (virt 0x%p)\n"
        !          5792:            "        + %d : dsa_msgout length = %u, data = 0x%x (virt 0x%p)\n" ,
        !          5793:            prefix ? prefix : "",
        !          5794:            host->host_no,  virt_to_bus (dsa), dsa, hostdata->dsa_msgout,
        !          5795:            dsa[hostdata->dsa_msgout / sizeof(u32)],
        !          5796:            dsa[hostdata->dsa_msgout / sizeof(u32) + 1],
        !          5797:            bus_to_virt (dsa[hostdata->dsa_msgout / sizeof(u32) + 1]));
        !          5798: 
        !          5799:     /* 
        !          5800:      * Only print messages if they're sane in length so we don't
        !          5801:      * blow the kernel printk buffer on something which won't buy us
        !          5802:      * anything.
        !          5803:      */
        !          5804: 
        !          5805:     if (dsa[hostdata->dsa_msgout / sizeof(u32)] < 
        !          5806:            sizeof (hostdata->free->select)) 
        !          5807:        for (i = dsa[hostdata->dsa_msgout / sizeof(u32)],
        !          5808:            ptr = bus_to_virt (dsa[hostdata->dsa_msgout / sizeof(u32) + 1]); 
        !          5809:            i > 0 && !check_address ((unsigned long) ptr, 1);
        !          5810:            ptr += len, i -= len) {
        !          5811:            printk("               ");
        !          5812:            len = print_msg (ptr);
        !          5813:            printk("\n");
        !          5814:            if (!len)
        !          5815:                break;
        !          5816:        }
        !          5817: 
        !          5818:     printk("        + %d : select_indirect = 0x%x\n",
        !          5819:        hostdata->dsa_select, dsa[hostdata->dsa_select / sizeof(u32)]);
        !          5820:     cmd = (Scsi_Cmnd *) bus_to_virt(dsa[hostdata->dsa_cmnd / sizeof(u32)]);
        !          5821:     printk("        + %d : dsa_cmnd = 0x%x ", hostdata->dsa_cmnd,
        !          5822:           (u32) virt_to_bus(cmd));
        !          5823:     if (cmd) {
        !          5824:        printk("               result = 0x%x, target = %d, lun = %d, cmd = ",
        !          5825:            cmd->result, cmd->target, cmd->lun);
        !          5826:        print_command(cmd->cmnd);
        !          5827:     } else
        !          5828:        printk("\n");
        !          5829:     printk("        + %d : dsa_next = 0x%x\n", hostdata->dsa_next,
        !          5830:        dsa[hostdata->dsa_next / sizeof(u32)]);
        !          5831:     if (cmd) { 
        !          5832:        printk("scsi%d target %d : sxfer_sanity = 0x%x, scntl3_sanity = 0x%x\n"
        !          5833:               "                   script : ",
        !          5834:            host->host_no, cmd->target,
        !          5835:            hostdata->sync[cmd->target].sxfer_sanity,
        !          5836:            hostdata->sync[cmd->target].scntl3_sanity);
        !          5837:        for (i = 0; i < (sizeof(hostdata->sync[cmd->target].script) / 4); ++i)
        !          5838:            printk ("0x%x ", hostdata->sync[cmd->target].script[i]);
        !          5839:        printk ("\n");
        !          5840:        print_progress (cmd);
        !          5841:     }
        !          5842: }
        !          5843: /*
        !          5844:  * Function : void print_queues (Scsi_Host *host) 
        !          5845:  * 
        !          5846:  * Purpose : print the contents of the NCR issue and reconnect queues
        !          5847:  *
        !          5848:  * Inputs : host - SCSI host we are interested in
        !          5849:  *
        !          5850:  */
        !          5851: 
        !          5852: static void 
        !          5853: print_queues (struct Scsi_Host *host) {
        !          5854:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          5855:        host->hostdata;
        !          5856:     u32 *dsa, *next_dsa;
        !          5857:     volatile u32 *current;
        !          5858:     int left;
        !          5859:     Scsi_Cmnd *cmd, *next_cmd;
        !          5860:     unsigned long flags;
        !          5861: 
        !          5862:     printk ("scsi%d : issue queue\n", host->host_no);
        !          5863: 
        !          5864:     for (left = host->can_queue, cmd = (Scsi_Cmnd *) hostdata->issue_queue; 
        !          5865:            left >= 0 && cmd; 
        !          5866:            cmd = next_cmd) {
        !          5867:        next_cmd = (Scsi_Cmnd *) cmd->SCp.ptr;
        !          5868:        save_flags(flags);
        !          5869:        cli();
        !          5870:        if (cmd->host_scribble) {
        !          5871:            if (check_address ((unsigned long) (cmd->host_scribble), 
        !          5872:                sizeof (cmd->host_scribble)) == -1)
        !          5873:                printk ("scsi%d: scsi pid %ld bad pointer to NCR53c7x0_cmd\n",
        !          5874:                    host->host_no, cmd->pid);
        !          5875:            /* print_dsa does sanity check on address, no need to check */
        !          5876:            else
        !          5877:                print_dsa (host, ((struct NCR53c7x0_cmd *) cmd->host_scribble)
        !          5878:                    -> dsa, "");
        !          5879:        } else 
        !          5880:            printk ("scsi%d : scsi pid %ld for target %d lun %d has no NCR53c7x0_cmd\n",
        !          5881:                host->host_no, cmd->pid, cmd->target, cmd->lun);
        !          5882:        restore_flags(flags);
        !          5883:     }
        !          5884: 
        !          5885:     if (left <= 0) {
        !          5886:        printk ("scsi%d : loop detected in issue queue\n",
        !          5887:            host->host_no);
        !          5888:     }
        !          5889: 
        !          5890:     /*
        !          5891:      * Traverse the NCR reconnect and start DSA structures, printing out 
        !          5892:      * each element until we hit the end or detect a loop.  Currently,
        !          5893:      * the reconnect structure is a linked list; and the start structure
        !          5894:      * is an array.  Eventually, the reconnect structure will become a 
        !          5895:      * list as well, since this simplifies the code.
        !          5896:      */
        !          5897: 
        !          5898:     printk ("scsi%d : schedule dsa array :\n", host->host_no);
        !          5899:     for (left = host->can_queue, current = hostdata->schedule;
        !          5900:            left > 0; current += 2, --left)
        !          5901:        if (current[0] != hostdata->NOP_insn) 
        !          5902: /* FIXME : convert pointer to dsa_begin to pointer to dsa. */
        !          5903:            print_dsa (host, bus_to_virt (current[1] - 
        !          5904:                (hostdata->E_dsa_code_begin - 
        !          5905:                hostdata->E_dsa_code_template)), "");
        !          5906:     printk ("scsi%d : end schedule dsa array\n", host->host_no);
        !          5907:     
        !          5908:     printk ("scsi%d : reconnect_dsa_head :\n", host->host_no);
        !          5909:            
        !          5910:     for (left = host->can_queue, 
        !          5911:        dsa = bus_to_virt (hostdata->reconnect_dsa_head);
        !          5912:        left >= 0 && dsa; 
        !          5913:        dsa = next_dsa) {
        !          5914:        save_flags (flags);
        !          5915:        cli();
        !          5916:        if (check_address ((unsigned long) dsa, sizeof(dsa)) == -1) {
        !          5917:            printk ("scsi%d: bad DSA pointer 0x%p", host->host_no,
        !          5918:                dsa);
        !          5919:            next_dsa = NULL;
        !          5920:        }
        !          5921:        else 
        !          5922:        {
        !          5923:            next_dsa = bus_to_virt(dsa[hostdata->dsa_next / sizeof(u32)]);
        !          5924:            print_dsa (host, dsa, "");
        !          5925:        }
        !          5926:        restore_flags(flags);
        !          5927:     }
        !          5928:     printk ("scsi%d : end reconnect_dsa_head\n", host->host_no);
        !          5929:     if (left < 0)
        !          5930:        printk("scsi%d: possible loop in ncr reconnect list\n",
        !          5931:            host->host_no);
        !          5932: }
        !          5933: 
        !          5934: static void
        !          5935: print_lots (struct Scsi_Host *host) {
        !          5936:     NCR53c7x0_local_declare();
        !          5937:     struct NCR53c7x0_hostdata *hostdata = 
        !          5938:        (struct NCR53c7x0_hostdata *) host->hostdata;
        !          5939:     u32 *dsp_next, *dsp, *dsa, dbc_dcmd;
        !          5940:     unsigned char dcmd, sbcl;
        !          5941:     int i, size;
        !          5942:     NCR53c7x0_local_setup(host);
        !          5943: 
        !          5944:     if ((dsp_next = bus_to_virt(NCR53c7x0_read32 (DSP_REG)))) {
        !          5945:        dbc_dcmd = NCR53c7x0_read32(DBC_REG);
        !          5946:        dcmd = (dbc_dcmd & 0xff000000) >> 24;
        !          5947:        dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
        !          5948:        dsa = bus_to_virt(NCR53c7x0_read32(DSA_REG));
        !          5949:        sbcl = NCR53c7x0_read8 (SBCL_REG);
        !          5950:            
        !          5951:        
        !          5952:        printk ("scsi%d : DCMD|DBC=0x%x, DNAD=0x%x (virt 0x%p)\n"
        !          5953:                "         DSA=0x%lx (virt 0x%p)\n"
        !          5954:                "         DSPS=0x%x, TEMP=0x%x (virt 0x%p), DMODE=0x%x\n"
        !          5955:                "         SXFER=0x%x, SCNTL3=0x%x\n"
        !          5956:                "         %s%s%sphase=%s, %d bytes in SCSI FIFO\n"
        !          5957:                "         STEST0=0x%x\n",
        !          5958:            host->host_no, dbc_dcmd, NCR53c7x0_read32(DNAD_REG), 
        !          5959:                bus_to_virt(NCR53c7x0_read32(DNAD_REG)),
        !          5960:            virt_to_bus(dsa), dsa, 
        !          5961:            NCR53c7x0_read32(DSPS_REG), NCR53c7x0_read32(TEMP_REG), 
        !          5962:            bus_to_virt (NCR53c7x0_read32(TEMP_REG)),
        !          5963:            (int) NCR53c7x0_read8(hostdata->dmode),
        !          5964:            (int) NCR53c7x0_read8(SXFER_REG), 
        !          5965:            (int) NCR53c7x0_read8(SCNTL3_REG_800),
        !          5966:            (sbcl & SBCL_BSY) ? "BSY " : "",
        !          5967:            (sbcl & SBCL_SEL) ? "SEL " : "",
        !          5968:            (sbcl & SBCL_REQ) ? "REQ " : "",
        !          5969:            sstat2_to_phase(NCR53c7x0_read8 (((hostdata->chip / 100) == 8) ?
        !          5970:                SSTAT1_REG : SSTAT2_REG)),
        !          5971:            (NCR53c7x0_read8 ((hostdata->chip / 100) == 8 ? 
        !          5972:                SSTAT1_REG : SSTAT2_REG) & SSTAT2_FF_MASK) >> SSTAT2_FF_SHIFT,
        !          5973:            NCR53c7x0_read8 (STEST0_REG_800));
        !          5974:        printk ("scsi%d : DSP 0x%lx (virt 0x%p) ->\n", host->host_no, 
        !          5975:            virt_to_bus(dsp), dsp);
        !          5976:        for (i = 6; i > 0; --i, dsp += size)
        !          5977:            size = print_insn (host, dsp, "", 1);
        !          5978:        if (NCR53c7x0_read8 (SCNTL1_REG) & SCNTL1_CON)  {
        !          5979:            printk ("scsi%d : connected (SDID=0x%x, SSID=0x%x)\n",
        !          5980:                host->host_no, NCR53c7x0_read8 (SDID_REG_800),
        !          5981:                NCR53c7x0_read8 (SSID_REG_800));
        !          5982:            print_dsa (host, dsa, "");
        !          5983:        }
        !          5984: 
        !          5985: #if 1
        !          5986:        print_queues (host);
        !          5987: #endif
        !          5988:     }
        !          5989: }
        !          5990: 
        !          5991: /*
        !          5992:  * Function : static int shutdown (struct Scsi_Host *host)
        !          5993:  * 
        !          5994:  * Purpose : does a clean (we hope) shutdown of the NCR SCSI 
        !          5995:  *     chip.  Use prior to dumping core, unloading the NCR driver,
        !          5996:  * 
        !          5997:  * Returns : 0 on success
        !          5998:  */
        !          5999: static int 
        !          6000: shutdown (struct Scsi_Host *host) {
        !          6001:     NCR53c7x0_local_declare();
        !          6002:     unsigned long flags;
        !          6003:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6004:        host->hostdata;
        !          6005:     NCR53c7x0_local_setup(host);
        !          6006:     save_flags (flags);
        !          6007:     cli();
        !          6008: /* Get in a state where we can reset the SCSI bus */
        !          6009:     ncr_halt (host);
        !          6010:     ncr_scsi_reset (host);
        !          6011:     hostdata->soft_reset(host);
        !          6012: 
        !          6013:     disable (host);
        !          6014:     restore_flags (flags);
        !          6015:     return 0;
        !          6016: }
        !          6017: 
        !          6018: /*
        !          6019:  * Function : void ncr_scsi_reset (struct Scsi_Host *host)
        !          6020:  *
        !          6021:  * Purpose : reset the SCSI bus.
        !          6022:  */
        !          6023: 
        !          6024: static void 
        !          6025: ncr_scsi_reset (struct Scsi_Host *host) {
        !          6026:     NCR53c7x0_local_declare();
        !          6027:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6028:        host->hostdata;
        !          6029:     unsigned long flags;
        !          6030:     int sien = 0;
        !          6031:     NCR53c7x0_local_setup(host);
        !          6032:     save_flags (flags);
        !          6033:     cli();
        !          6034:     if ((hostdata->chip / 100) == 8) {
        !          6035:        sien = NCR53c7x0_read8(SIEN0_REG_800);
        !          6036:        NCR53c7x0_write8(SIEN0_REG_800, sien & ~SIEN_RST);
        !          6037:     }
        !          6038:     NCR53c7x0_write8(SCNTL1_REG, SCNTL1_RST);
        !          6039:     udelay(25);        /* Minimum amount of time to assert RST */
        !          6040:     NCR53c7x0_write8(SCNTL1_REG, 0);
        !          6041:     if ((hostdata->chip / 100) == 8) {
        !          6042:        NCR53c7x0_write8(SIEN0_REG_800, sien);
        !          6043:     }
        !          6044:     restore_flags (flags);
        !          6045: }
        !          6046: 
        !          6047: /* 
        !          6048:  * Function : void hard_reset (struct Scsi_Host *host)
        !          6049:  *
        !          6050:  */
        !          6051: 
        !          6052: static void 
        !          6053: hard_reset (struct Scsi_Host *host) {
        !          6054:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6055:        host->hostdata;
        !          6056:     unsigned long flags;
        !          6057:     save_flags (flags);
        !          6058:     cli();
        !          6059:     ncr_scsi_reset(host);
        !          6060:     NCR53c7x0_driver_init (host);
        !          6061:     if (hostdata->soft_reset)
        !          6062:        hostdata->soft_reset (host);
        !          6063:     restore_flags(flags);
        !          6064: }
        !          6065: 
        !          6066: 
        !          6067: /*
        !          6068:  * Function : Scsi_Cmnd *return_outstanding_commands (struct Scsi_Host *host,
        !          6069:  *     int free, int issue)
        !          6070:  *
        !          6071:  * Purpose : return a linked list (using the SCp.buffer field as next,
        !          6072:  *     so we don't perturb hostdata.  We don't use a field of the 
        !          6073:  *     NCR53c7x0_cmd structure since we may not have allocated one 
        !          6074:  *     for the command causing the reset.) of Scsi_Cmnd structures that 
        !          6075:  *     had propogated bellow the Linux issue queue level.  If free is set, 
        !          6076:  *     free the NCR53c7x0_cmd structures which are associated with 
        !          6077:  *     the Scsi_Cmnd structures, and clean up any internal 
        !          6078:  *     NCR lists that the commands were on.  If issue is set,
        !          6079:  *     also return commands in the issue queue.
        !          6080:  *
        !          6081:  * Returns : linked list of commands
        !          6082:  *
        !          6083:  * NOTE : the caller should insure that the NCR chip is halted
        !          6084:  *     if the free flag is set. 
        !          6085:  */
        !          6086: 
        !          6087: static Scsi_Cmnd *
        !          6088: return_outstanding_commands (struct Scsi_Host *host, int free, int issue) {
        !          6089:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6090:        host->hostdata;
        !          6091:     struct NCR53c7x0_cmd *c;
        !          6092:     int i;
        !          6093:     u32 *current;
        !          6094:     Scsi_Cmnd *list = NULL, *tmp;
        !          6095:     for (c = (struct NCR53c7x0_cmd *) hostdata->running_list; c; 
        !          6096:        c = (struct NCR53c7x0_cmd *) c->next)  {
        !          6097:        if (c->cmd->SCp.buffer) {
        !          6098:            printk ("scsi%d : loop detected in running list!\n", host->host_no);
        !          6099:            break;
        !          6100:        } else {
        !          6101:            printk ("The sti() implicit in a printk() prevents hangs\n");
        !          6102:            break;
        !          6103:        }
        !          6104: 
        !          6105:        c->cmd->SCp.buffer = (struct scatterlist *) list;
        !          6106:        list = c->cmd;
        !          6107:        if (free) {
        !          6108:            c->next = hostdata->free;
        !          6109:            hostdata->free = c;
        !          6110:        }
        !          6111:     }
        !          6112: 
        !          6113:     if (free) { 
        !          6114:        for (i = 0, current = (u32 *) hostdata->schedule; 
        !          6115:            i < host->can_queue; ++i, current += 2) {
        !          6116:            current[0] = hostdata->NOP_insn;
        !          6117:            current[1] = 0xdeadbeef;
        !          6118:        }
        !          6119:        hostdata->current = NULL;
        !          6120:     }
        !          6121: 
        !          6122:     if (issue) {
        !          6123:        for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; tmp = tmp->next) {
        !          6124:            if (tmp->SCp.buffer) {
        !          6125:                printk ("scsi%d : loop detected in issue queue!\n", 
        !          6126:                        host->host_no);
        !          6127:                break;
        !          6128:            }
        !          6129:            tmp->SCp.buffer = (struct scatterlist *) list;
        !          6130:            list = tmp;
        !          6131:        }
        !          6132:        if (free)
        !          6133:            hostdata->issue_queue = NULL;
        !          6134:                
        !          6135:     }
        !          6136:     return list;
        !          6137: }
        !          6138: 
        !          6139: /* 
        !          6140:  * Function : static int disable (struct Scsi_Host *host)
        !          6141:  *
        !          6142:  * Purpose : disables the given NCR host, causing all commands
        !          6143:  *     to return a driver error.  Call this so we can unload the
        !          6144:  *     module during development and try again.  Eventually, 
        !          6145:  *     we should be able to find clean workarrounds for these
        !          6146:  *     problems.
        !          6147:  *
        !          6148:  * Inputs : host - hostadapter to twiddle
        !          6149:  *
        !          6150:  * Returns : 0 on success.
        !          6151:  */
        !          6152: 
        !          6153: static int 
        !          6154: disable (struct Scsi_Host *host) {
        !          6155:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6156:        host->hostdata;
        !          6157:     unsigned long flags;
        !          6158:     Scsi_Cmnd *nuke_list, *tmp;
        !          6159:     save_flags(flags);
        !          6160:     cli();
        !          6161:     if (hostdata->state != STATE_HALTED)
        !          6162:        ncr_halt (host);
        !          6163:     nuke_list = return_outstanding_commands (host, 1 /* free */, 1 /* issue */);
        !          6164:     hard_reset (host);
        !          6165:     hostdata->state = STATE_DISABLED;
        !          6166:     restore_flags(flags);
        !          6167:     printk ("scsi%d : nuking commands\n", host->host_no);
        !          6168:     for (; nuke_list; nuke_list = tmp) {
        !          6169:            tmp = (Scsi_Cmnd *) nuke_list->SCp.buffer;
        !          6170:            nuke_list->result = DID_ERROR << 16;
        !          6171:            nuke_list->scsi_done(nuke_list);
        !          6172:     }
        !          6173:     printk ("scsi%d : done. \n", host->host_no);
        !          6174:     printk (KERN_ALERT "scsi%d : disabled.  Unload and reload\n",
        !          6175:        host->host_no);
        !          6176:     return 0;
        !          6177: }
        !          6178: 
        !          6179: /*
        !          6180:  * Function : static int ncr_halt (struct Scsi_Host *host)
        !          6181:  * 
        !          6182:  * Purpose : halts the SCSI SCRIPTS(tm) processor on the NCR chip
        !          6183:  *
        !          6184:  * Inputs : host - SCSI chip to halt
        !          6185:  *
        !          6186:  * Returns : 0 on success
        !          6187:  */
        !          6188: 
        !          6189: static int 
        !          6190: ncr_halt (struct Scsi_Host *host) {
        !          6191:     NCR53c7x0_local_declare();
        !          6192:     unsigned long flags;
        !          6193:     unsigned char istat, tmp;
        !          6194:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6195:        host->hostdata;
        !          6196:     int stage;
        !          6197:     NCR53c7x0_local_setup(host);
        !          6198: 
        !          6199:     save_flags(flags);
        !          6200:     cli();
        !          6201:     /* Stage 0 : eat all interrupts
        !          6202:        Stage 1 : set ABORT
        !          6203:        Stage 2 : eat all but abort interrupts
        !          6204:        Stage 3 : eat all interrupts
        !          6205:      */
        !          6206:     for (stage = 0;;) {
        !          6207:        if (stage == 1) {
        !          6208:            NCR53c7x0_write8(hostdata->istat, ISTAT_ABRT);
        !          6209:            ++stage;
        !          6210:        }
        !          6211:        istat = NCR53c7x0_read8 (hostdata->istat);
        !          6212:        if (istat & ISTAT_SIP) {
        !          6213:            if ((hostdata->chip / 100) == 8) {
        !          6214:                tmp = NCR53c7x0_read8(SIST0_REG_800);
        !          6215:                udelay(1);
        !          6216:                tmp = NCR53c7x0_read8(SIST1_REG_800);
        !          6217:            } else {
        !          6218:                tmp = NCR53c7x0_read8(SSTAT0_REG);
        !          6219:            }
        !          6220:        } else if (istat & ISTAT_DIP) {
        !          6221:            tmp = NCR53c7x0_read8(DSTAT_REG);
        !          6222:            if (stage == 2) {
        !          6223:                if (tmp & DSTAT_ABRT) {
        !          6224:                    NCR53c7x0_write8(hostdata->istat, 0);
        !          6225:                    ++stage;
        !          6226:                } else {
        !          6227:                    printk(KERN_ALERT "scsi%d : could not halt NCR chip\n", 
        !          6228:                        host->host_no);
        !          6229:                    disable (host);
        !          6230:                }
        !          6231:            }
        !          6232:        }
        !          6233:        if (!(istat & (ISTAT_SIP|ISTAT_DIP))) 
        !          6234:            if (stage == 0)
        !          6235:                ++stage;
        !          6236:            else if (stage == 3)
        !          6237:                break;
        !          6238:     }
        !          6239:     hostdata->state = STATE_HALTED;
        !          6240:     restore_flags(flags);
        !          6241: #if 0
        !          6242:     print_lots (host);
        !          6243: #endif
        !          6244:     return 0;
        !          6245: }
        !          6246: 
        !          6247: /* 
        !          6248:  * Function: event_name (int event)
        !          6249:  * 
        !          6250:  * Purpose: map event enum into user-readable strings.
        !          6251:  */
        !          6252: 
        !          6253: static const char *
        !          6254: event_name (int event) {
        !          6255:     switch (event) {
        !          6256:     case EVENT_NONE:           return "none";
        !          6257:     case EVENT_ISSUE_QUEUE:    return "to issue queue";
        !          6258:     case EVENT_START_QUEUE:    return "to start queue";
        !          6259:     case EVENT_SELECT:         return "selected";
        !          6260:     case EVENT_DISCONNECT:     return "disconnected";
        !          6261:     case EVENT_RESELECT:       return "reselected";
        !          6262:     case EVENT_COMPLETE:       return "completed";
        !          6263:     case EVENT_IDLE:           return "idle";
        !          6264:     case EVENT_SELECT_FAILED:  return "select failed";
        !          6265:     case EVENT_BEFORE_SELECT:  return "before select";
        !          6266:     case EVENT_RESELECT_FAILED:        return "reselect failed";
        !          6267:     default:                   return "unknown";
        !          6268:     }
        !          6269: }
        !          6270: 
        !          6271: /*
        !          6272:  * Function : void dump_events (struct Scsi_Host *host, count)
        !          6273:  *
        !          6274:  * Purpose : print last count events which have occurred.
        !          6275:  */ 
        !          6276: static void
        !          6277: dump_events (struct Scsi_Host *host, int count) {
        !          6278:     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
        !          6279:        host->hostdata;
        !          6280:     struct NCR53c7x0_event event;
        !          6281:     int i;
        !          6282:     unsigned long flags;
        !          6283:     if (hostdata->events) {
        !          6284:        if (count > hostdata->event_size)
        !          6285:            count = hostdata->event_size;
        !          6286:        for (i = hostdata->event_index; count > 0; 
        !          6287:            i = (i ? i - 1 : hostdata->event_size -1), --count) {
        !          6288:            save_flags(flags);
        !          6289: /*
        !          6290:  * By copying the event we're currently examinging with interrupts
        !          6291:  * disabled, we can do multiple printk(), etc. operations and 
        !          6292:  * still be guaranteed that they're happening on the same 
        !          6293:  * event structure.
        !          6294:  */
        !          6295:            cli();
        !          6296: #if 0
        !          6297:            event = hostdata->events[i];
        !          6298: #else
        !          6299:            memcpy ((void *) &event, (void *) &(hostdata->events[i]),
        !          6300:                sizeof(event));
        !          6301: #endif
        !          6302: 
        !          6303:            restore_flags(flags);
        !          6304:            printk ("scsi%d : %s event %d at %ld secs %ld usecs target %d lun %d\n",
        !          6305:                host->host_no, event_name (event.event), count,
        !          6306:                (long) event.time.tv_sec, (long) event.time.tv_usec,
        !          6307:                event.target, event.lun);
        !          6308:            if (event.dsa) 
        !          6309:                printk ("         event for dsa 0x%lx (virt 0x%p)\n", 
        !          6310:                    virt_to_bus(event.dsa), event.dsa);
        !          6311:            if (event.pid != -1) {
        !          6312:                printk ("         event for pid %ld ", event.pid);
        !          6313:                print_command (event.cmnd);
        !          6314:            }
        !          6315:        }
        !          6316:     }
        !          6317: }
        !          6318: 
        !          6319: /*
        !          6320:  * Function: check_address
        !          6321:  *
        !          6322:  * Purpose: Check to see if a possibly corrupt pointer will fault the 
        !          6323:  *     kernel.
        !          6324:  *
        !          6325:  * Inputs: addr - address; size - size of area
        !          6326:  *
        !          6327:  * Returns: 0 if area is OK, -1 on error.
        !          6328:  *
        !          6329:  * NOTES: should be implemented in terms of vverify on kernels 
        !          6330:  *     that have it.
        !          6331:  */
        !          6332: 
        !          6333: static int 
        !          6334: check_address (unsigned long addr, int size) {
        !          6335:     return (MAP_NR(addr) < 1 || MAP_NR(addr + size) > MAP_NR(high_memory) ?
        !          6336:            -1 : 0);
        !          6337: }
        !          6338: 
        !          6339: #ifdef MODULE
        !          6340: int 
        !          6341: NCR53c7x0_release(struct Scsi_Host *host) {
        !          6342:     struct NCR53c7x0_hostdata *hostdata = 
        !          6343:        (struct NCR53c7x0_hostdata *) host->hostdata;
        !          6344:     struct NCR53c7x0_cmd *cmd, *tmp;
        !          6345:     shutdown (host);
        !          6346:     if (host->irq != IRQ_NONE)
        !          6347:        {
        !          6348:            int irq_count;
        !          6349:            struct Scsi_Host *tmp;
        !          6350:            for (irq_count = 0, tmp = first_host; tmp; tmp = tmp->next)
        !          6351:                if (tmp->hostt == the_template && tmp->irq == host->irq)
        !          6352:                    ++irq_count;
        !          6353:            if (irq_count == 1)
        !          6354:                free_irq(host->irq);
        !          6355:        }
        !          6356:     if (host->dma_channel != DMA_NONE)
        !          6357:        free_dma(host->dma_channel);
        !          6358:     if (host->io_port)
        !          6359:        release_region(host->io_port, host->n_io_port);
        !          6360:     
        !          6361:     for (cmd = (struct NCR53c7x0_cmd *) hostdata->free; cmd; cmd = tmp, 
        !          6362:        --hostdata->num_cmds) {
        !          6363:        tmp = (struct NCR53c7x0_cmd *) cmd->next;
        !          6364:     /* 
        !          6365:      * If we're going to loop, try to stop it to get a more accurate
        !          6366:      * count of the leaked commands.
        !          6367:      */
        !          6368:        cmd->next = NULL;
        !          6369:        if (cmd->free)
        !          6370:            cmd->free ((void *) cmd->real, cmd->size);
        !          6371:     }
        !          6372:     if (hostdata->num_cmds)
        !          6373:        printk ("scsi%d : leaked %d NCR53c7x0_cmd structures\n",
        !          6374:            host->host_no, hostdata->num_cmds);
        !          6375:     if (hostdata->events) 
        !          6376:        vfree ((void *)hostdata->events);
        !          6377:     return 1;
        !          6378: }
        !          6379: Scsi_Host_Template driver_template = NCR53c7xx;
        !          6380: #include "scsi_module.c"
        !          6381: #endif /* def MODULE */

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