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Annotation of Gnu-Mach/linux/src/drivers/net/ewrk3.c, revision 1.1

1.1     ! root        1: /*  ewrk3.c: A DIGITAL EtherWORKS 3 ethernet driver for Linux.
        !             2: 
        !             3:     Written 1994 by David C. Davies.
        !             4: 
        !             5:     Copyright 1994 Digital Equipment Corporation.
        !             6: 
        !             7:     This software may be used and distributed according to the terms of
        !             8:     the GNU Public License, incorporated herein by reference.
        !             9: 
        !            10:     This driver is written for the Digital Equipment Corporation series
        !            11:     of EtherWORKS ethernet cards:
        !            12: 
        !            13:        DE203 Turbo (BNC)
        !            14:        DE204 Turbo (TP)
        !            15:        DE205 Turbo (TP BNC)
        !            16: 
        !            17:     The driver has been tested on a relatively busy  network using the DE205
        !            18:     card and benchmarked with 'ttcp': it transferred 16M  of data at 975kB/s
        !            19:     (7.8Mb/s) to a DECstation 5000/200.
        !            20: 
        !            21:     The author may be reached at [email protected].
        !            22: 
        !            23:     =========================================================================
        !            24:     This driver has been written  substantially  from scratch, although  its
        !            25:     inheritance of style and stack interface from 'depca.c' and in turn from
        !            26:     Donald Becker's 'lance.c' should be obvious.
        !            27: 
        !            28:     The  DE203/4/5 boards  all  use a new proprietary   chip in place of the
        !            29:     LANCE chip used in prior cards  (DEPCA, DE100, DE200/1/2, DE210, DE422).
        !            30:     Use the depca.c driver in the standard distribution  for the LANCE based
        !            31:     cards from DIGITAL; this driver will not work with them.
        !            32: 
        !            33:     The DE203/4/5 cards have 2  main modes: shared memory  and I/O only. I/O
        !            34:     only makes  all the card accesses through  I/O transactions and  no high
        !            35:     (shared)  memory is used. This  mode provides a >48% performance penalty
        !            36:     and  is deprecated in this  driver,  although allowed to provide initial
        !            37:     setup when hardstrapped.
        !            38: 
        !            39:     The shared memory mode comes in 3 flavours: 2kB, 32kB and 64kB. There is
        !            40:     no point in using any mode other than the 2kB  mode - their performances
        !            41:     are virtually identical, although the driver has  been tested in the 2kB
        !            42:     and 32kB modes. I would suggest you uncomment the line:
        !            43: 
        !            44:                              FORCE_2K_MODE;
        !            45: 
        !            46:     to allow the driver to configure the card as a  2kB card at your current
        !            47:     base  address, thus leaving more  room to clutter  your  system box with
        !            48:     other memory hungry boards.
        !            49: 
        !            50:     As many ISA  and EISA cards  can be supported  under this driver  as you
        !            51:     wish, limited primarily  by the available IRQ lines,  rather than by the
        !            52:     available I/O addresses  (24 ISA,  16 EISA).   I have  checked different
        !            53:     configurations of  multiple  depca cards and  ewrk3 cards  and have  not
        !            54:     found a problem yet (provided you have at least depca.c v0.38) ...
        !            55: 
        !            56:     The board IRQ setting   must be at  an unused  IRQ which is  auto-probed
        !            57:     using  Donald  Becker's autoprobe  routines.   All  these cards   are at
        !            58:     {5,10,11,15}.
        !            59: 
        !            60:     No 16MB memory  limitation should exist with this  driver as DMA is  not
        !            61:     used and the common memory area is in low memory on the network card (my
        !            62:     current system has 20MB and I've not had problems yet).
        !            63: 
        !            64:     The ability to load  this driver as a  loadable module has been included
        !            65:     and used  extensively during the  driver development (to save those long
        !            66:     reboot sequences). To utilise this ability, you have to do 8 things:
        !            67: 
        !            68:     0) have a copy of the loadable modules code installed on your system.
        !            69:     1) copy ewrk3.c from the  /linux/drivers/net directory to your favourite
        !            70:     temporary directory.
        !            71:     2) edit the  source code near  line 1898 to reflect  the I/O address and
        !            72:     IRQ you're using.
        !            73:     3) compile  ewrk3.c, but include -DMODULE in  the command line to ensure
        !            74:     that the correct bits are compiled (see end of source code).
        !            75:     4) if you are wanting to add a new  card, goto 5. Otherwise, recompile a
        !            76:     kernel with the ewrk3 configuration turned off and reboot.
        !            77:     5) insmod ewrk3.o
        !            78:           [Alan Cox: Changed this so you can insmod ewrk3.o irq=x io=y]
        !            79:     6) run the net startup bits for your new eth?? interface manually 
        !            80:     (usually /etc/rc.inet[12] at boot time). 
        !            81:     7) enjoy!
        !            82: 
        !            83:     Note that autoprobing is not allowed in loadable modules - the system is
        !            84:     already up and running and you're messing with interrupts.
        !            85: 
        !            86:     To unload a module, turn off the associated interface 
        !            87:     'ifconfig eth?? down' then 'rmmod ewrk3'.
        !            88: 
        !            89:     Promiscuous   mode has been  turned  off  in this driver,   but  all the
        !            90:     multicast  address bits  have been   turned on. This  improved the  send
        !            91:     performance on a busy network by about 13%.
        !            92: 
        !            93:     Ioctl's have now been provided (primarily because  I wanted to grab some
        !            94:     packet size statistics). They  are patterned after 'plipconfig.c' from a
        !            95:     suggestion by Alan Cox.  Using these  ioctls, you can enable promiscuous
        !            96:     mode, add/delete multicast  addresses, change the hardware address,  get
        !            97:     packet size distribution statistics and muck around with the control and
        !            98:     status register. I'll add others if and when the need arises.
        !            99: 
        !           100:     TO DO:
        !           101:     ------
        !           102: 
        !           103: 
        !           104:     Revision History
        !           105:     ----------------
        !           106: 
        !           107:     Version   Date        Description
        !           108:   
        !           109:       0.1     26-aug-94   Initial writing. ALPHA code release.
        !           110:       0.11    31-aug-94   Fixed: 2k mode memory base calc., 
        !           111:                                  LeMAC version calc.,
        !           112:                                 IRQ vector assignments during autoprobe.
        !           113:       0.12    31-aug-94   Tested working on LeMAC2 (DE20[345]-AC) card.
        !           114:                           Fixed up MCA hash table algorithm.
        !           115:       0.20     4-sep-94   Added IOCTL functionality.
        !           116:       0.21    14-sep-94   Added I/O mode.
        !           117:       0.21axp 15-sep-94   Special version for ALPHA AXP Linux V1.0.
        !           118:       0.22    16-sep-94   Added more IOCTLs & tidied up.
        !           119:       0.23    21-sep-94   Added transmit cut through.
        !           120:       0.24    31-oct-94   Added uid checks in some ioctls.
        !           121:       0.30     1-nov-94   BETA code release.
        !           122:       0.31     5-dec-94   Added check/allocate region code.
        !           123:       0.32    16-jan-95   Broadcast packet fix.
        !           124:       0.33    10-Feb-95   Fix recognition bug reported by <[email protected]>.
        !           125:       0.40    27-Dec-95   Rationalise MODULE and autoprobe code.
        !           126:                           Rewrite for portability & updated.
        !           127:                           ALPHA support from <[email protected]>
        !           128:                           Added verify_area() calls in ewrk3_ioctl() from
        !           129:                           suggestion by <[email protected]>.
        !           130:                          Add new multicasting code.
        !           131:       0.41    20-Jan-96   Fix IRQ set up problem reported by 
        !           132:                           <[email protected]>.
        !           133:       0.42    22-Apr-96          Fix alloc_device() bug <[email protected]>
        !           134:       0.43    16-Aug-96          Update alloc_device() to conform to de4x5.c
        !           135: 
        !           136:     =========================================================================
        !           137: */
        !           138: 
        !           139: static const char *version = "ewrk3.c:v0.43 96/8/16 [email protected]\n";
        !           140: 
        !           141: #include <linux/module.h>
        !           142: 
        !           143: #include <linux/kernel.h>
        !           144: #include <linux/sched.h>
        !           145: #include <linux/string.h>
        !           146: #include <linux/ptrace.h>
        !           147: #include <linux/errno.h>
        !           148: #include <linux/ioport.h>
        !           149: #include <linux/malloc.h>
        !           150: #include <linux/interrupt.h>
        !           151: #include <linux/delay.h>
        !           152: #include <asm/bitops.h>
        !           153: #include <asm/io.h>
        !           154: #include <asm/dma.h>
        !           155: #include <asm/segment.h>
        !           156: 
        !           157: #include <linux/netdevice.h>
        !           158: #include <linux/etherdevice.h>
        !           159: #include <linux/skbuff.h>
        !           160: 
        !           161: #include <linux/time.h>
        !           162: #include <linux/types.h>
        !           163: #include <linux/unistd.h>
        !           164: #include <linux/ctype.h>
        !           165: 
        !           166: #include "ewrk3.h"
        !           167: 
        !           168: #ifdef EWRK3_DEBUG
        !           169: static int ewrk3_debug = EWRK3_DEBUG;
        !           170: #else
        !           171: static int ewrk3_debug = 1;
        !           172: #endif
        !           173: 
        !           174: #define EWRK3_NDA 0xffe0            /* No Device Address */
        !           175: 
        !           176: #define PROBE_LENGTH    32
        !           177: #define ETH_PROM_SIG    0xAA5500FFUL
        !           178: 
        !           179: #ifndef EWRK3_SIGNATURE
        !           180: #define EWRK3_SIGNATURE {"DE203","DE204","DE205",""}
        !           181: #define EWRK3_STRLEN 8
        !           182: #endif
        !           183: 
        !           184: #ifndef EWRK3_RAM_BASE_ADDRESSES
        !           185: #define EWRK3_RAM_BASE_ADDRESSES {0xc0000,0xd0000,0x00000}
        !           186: #endif
        !           187: 
        !           188: /*
        !           189: ** Sets up the I/O area for the autoprobe.
        !           190: */
        !           191: #define EWRK3_IO_BASE 0x100             /* Start address for probe search */
        !           192: #define EWRK3_IOP_INC 0x20              /* I/O address increment */
        !           193: #define EWRK3_TOTAL_SIZE 0x20           /* required I/O address length */
        !           194: 
        !           195: #ifndef MAX_NUM_EWRK3S
        !           196: #define MAX_NUM_EWRK3S 21
        !           197: #endif
        !           198: 
        !           199: #ifndef EWRK3_EISA_IO_PORTS 
        !           200: #define EWRK3_EISA_IO_PORTS 0x0c00      /* I/O port base address, slot 0 */
        !           201: #endif
        !           202: 
        !           203: #ifndef MAX_EISA_SLOTS
        !           204: #define MAX_EISA_SLOTS 16
        !           205: #define EISA_SLOT_INC 0x1000
        !           206: #endif
        !           207: 
        !           208: #define CRC_POLYNOMIAL_BE 0x04c11db7UL   /* Ethernet CRC, big endian */
        !           209: #define CRC_POLYNOMIAL_LE 0xedb88320UL   /* Ethernet CRC, little endian */
        !           210: 
        !           211: #define QUEUE_PKT_TIMEOUT (1*HZ)         /* Jiffies */
        !           212: 
        !           213: /*
        !           214: ** EtherWORKS 3 shared memory window sizes
        !           215: */
        !           216: #define IO_ONLY         0x00
        !           217: #define SHMEM_2K        0x800
        !           218: #define SHMEM_32K       0x8000
        !           219: #define SHMEM_64K       0x10000
        !           220: 
        !           221: /*
        !           222: ** EtherWORKS 3 IRQ ENABLE/DISABLE
        !           223: */
        !           224: #define ENABLE_IRQs { \
        !           225:   icr |= lp->irq_mask;\
        !           226:   outb(icr, EWRK3_ICR);                     /* Enable the IRQs */\
        !           227: }
        !           228: 
        !           229: #define DISABLE_IRQs { \
        !           230:   icr = inb(EWRK3_ICR);\
        !           231:   icr &= ~lp->irq_mask;\
        !           232:   outb(icr, EWRK3_ICR);                     /* Disable the IRQs */\
        !           233: }
        !           234: 
        !           235: /*
        !           236: ** EtherWORKS 3 START/STOP
        !           237: */
        !           238: #define START_EWRK3 { \
        !           239:   csr = inb(EWRK3_CSR);\
        !           240:   csr &= ~(CSR_TXD|CSR_RXD);\
        !           241:   outb(csr, EWRK3_CSR);                     /* Enable the TX and/or RX */\
        !           242: }
        !           243: 
        !           244: #define STOP_EWRK3 { \
        !           245:   csr = (CSR_TXD|CSR_RXD);\
        !           246:   outb(csr, EWRK3_CSR);                     /* Disable the TX and/or RX */\
        !           247: }
        !           248: 
        !           249: /*
        !           250: ** The EtherWORKS 3 private structure
        !           251: */
        !           252: #define EWRK3_PKT_STAT_SZ 16
        !           253: #define EWRK3_PKT_BIN_SZ  128           /* Should be >=100 unless you
        !           254:                                            increase EWRK3_PKT_STAT_SZ */
        !           255: 
        !           256: struct ewrk3_private {
        !           257:     char adapter_name[80];              /* Name exported to /proc/ioports */
        !           258:     u_long shmem_base;                  /* Shared memory start address */
        !           259:     u_long shmem_length;                /* Shared memory window length */
        !           260:     struct enet_statistics stats;       /* Public stats */
        !           261:     struct {
        !           262:       u32 bins[EWRK3_PKT_STAT_SZ]; /* Private stats counters */
        !           263:       u32 unicast;
        !           264:       u32 multicast;
        !           265:       u32 broadcast;
        !           266:       u32 excessive_collisions;
        !           267:       u32 tx_underruns;
        !           268:       u32 excessive_underruns;
        !           269:     } pktStats;
        !           270:     u_char irq_mask;                    /* Adapter IRQ mask bits */
        !           271:     u_char mPage;                       /* Maximum 2kB Page number */
        !           272:     u_char lemac;                       /* Chip rev. level */
        !           273:     u_char hard_strapped;               /* Don't allow a full open */
        !           274:     u_char lock;                        /* Lock the page register */
        !           275:     u_char txc;                         /* Transmit cut through */
        !           276:     u_char *mctbl;                      /* Pointer to the multicast table */
        !           277: };
        !           278: 
        !           279: /*
        !           280: ** Force the EtherWORKS 3 card to be in 2kB MODE
        !           281: */
        !           282: #define FORCE_2K_MODE { \
        !           283:   shmem_length = SHMEM_2K;\
        !           284:   outb(((mem_start - 0x80000) >> 11), EWRK3_MBR);\
        !           285: }
        !           286: 
        !           287: /*
        !           288: ** Public Functions
        !           289: */
        !           290: static int    ewrk3_open(struct device *dev);
        !           291: static int    ewrk3_queue_pkt(struct sk_buff *skb, struct device *dev);
        !           292: static void   ewrk3_interrupt(int irq, void *dev_id, struct pt_regs *regs);
        !           293: static int    ewrk3_close(struct device *dev);
        !           294: static struct enet_statistics *ewrk3_get_stats(struct device *dev);
        !           295: static void   set_multicast_list(struct device *dev);
        !           296: static int    ewrk3_ioctl(struct device *dev, struct ifreq *rq, int cmd);
        !           297: 
        !           298: /*
        !           299: ** Private functions
        !           300: */
        !           301: static int    ewrk3_hw_init(struct device *dev, u_long iobase);
        !           302: static void   ewrk3_init(struct device *dev);
        !           303: static int    ewrk3_rx(struct device *dev);
        !           304: static int    ewrk3_tx(struct device *dev);
        !           305: 
        !           306: static void   EthwrkSignature(char * name, char *eeprom_image);
        !           307: static int    DevicePresent(u_long iobase);
        !           308: static void   SetMulticastFilter(struct device *dev);
        !           309: static int    EISA_signature(char *name, s32 eisa_id);
        !           310: 
        !           311: static int    Read_EEPROM(u_long iobase, u_char eaddr);
        !           312: static int    Write_EEPROM(short data, u_long iobase, u_char eaddr);
        !           313: static u_char get_hw_addr (struct device *dev, u_char *eeprom_image, char chipType);
        !           314: 
        !           315: static void   isa_probe(struct device *dev, u_long iobase);
        !           316: static void   eisa_probe(struct device *dev, u_long iobase);
        !           317: static struct device *alloc_device(struct device *dev, u_long iobase);
        !           318: static int    ewrk3_dev_index(char *s);
        !           319: static struct device *insert_device(struct device *dev, u_long iobase, int (*init)(struct device *));
        !           320: 
        !           321: 
        !           322: #ifdef MODULE
        !           323: int  init_module(void);
        !           324: void cleanup_module(void);
        !           325: static int autoprobed = 1, loading_module = 1;
        !           326: 
        !           327: # else
        !           328: static u_char irq[] = {5,0,10,3,11,9,15,12};
        !           329: static int autoprobed = 0, loading_module = 0;
        !           330: 
        !           331: #endif /* MODULE */
        !           332: 
        !           333: static char name[EWRK3_STRLEN + 1];
        !           334: static int num_ewrk3s = 0, num_eth = 0;
        !           335: 
        !           336: /*
        !           337: ** Miscellaneous defines...
        !           338: */
        !           339: #define INIT_EWRK3 {\
        !           340:     outb(EEPROM_INIT, EWRK3_IOPR);\
        !           341:     udelay(1000);\
        !           342: }
        !           343: 
        !           344: 
        !           345: 
        !           346: 
        !           347: int ewrk3_probe(struct device *dev)
        !           348: {
        !           349:   int tmp = num_ewrk3s, status = -ENODEV;
        !           350:   u_long iobase = dev->base_addr;
        !           351: 
        !           352:   if ((iobase == 0) && loading_module){
        !           353:     printk("Autoprobing is not supported when loading a module based driver.\n");
        !           354:     status = -EIO;
        !           355:   } else {                              /* First probe for the Ethernet */
        !           356:                                        /* Address PROM pattern */
        !           357:     isa_probe(dev, iobase);
        !           358:     eisa_probe(dev, iobase);
        !           359: 
        !           360:     if ((tmp == num_ewrk3s) && (iobase != 0) && loading_module) {
        !           361:       printk("%s: ewrk3_probe() cannot find device at 0x%04lx.\n", dev->name, 
        !           362:                                                                       iobase);
        !           363:     }
        !           364: 
        !           365:     /*
        !           366:     ** Walk the device list to check that at least one device
        !           367:     ** initialised OK
        !           368:     */
        !           369:     for (; (dev->priv == NULL) && (dev->next != NULL); dev = dev->next);
        !           370: 
        !           371:     if (dev->priv) status = 0;
        !           372:     if (iobase == 0) autoprobed = 1;
        !           373:   }
        !           374: 
        !           375:   return status;
        !           376: }
        !           377: 
        !           378: static int
        !           379: ewrk3_hw_init(struct device *dev, u_long iobase)
        !           380: {
        !           381:   struct ewrk3_private *lp;
        !           382:   int i, status=0;
        !           383:   u_long mem_start, shmem_length;
        !           384:   u_char cr, cmr, icr, nicsr, lemac, hard_strapped = 0;
        !           385:   u_char eeprom_image[EEPROM_MAX], chksum, eisa_cr = 0;
        !           386: 
        !           387:   /*
        !           388:   ** Stop the EWRK3. Enable the DBR ROM. Disable interrupts and remote boot.
        !           389:   ** This also disables the EISA_ENABLE bit in the EISA Control Register.
        !           390:   */
        !           391:   if (iobase > 0x400) eisa_cr = inb(EISA_CR);
        !           392:   INIT_EWRK3;
        !           393: 
        !           394:   nicsr = inb(EWRK3_CSR);
        !           395: 
        !           396:   icr = inb(EWRK3_ICR);
        !           397:   icr &= 0x70;
        !           398:   outb(icr, EWRK3_ICR);                           /* Disable all the IRQs */
        !           399: 
        !           400:   if (nicsr == (CSR_TXD|CSR_RXD)) {
        !           401: 
        !           402:     /* Check that the EEPROM is alive and well and not living on Pluto... */
        !           403:     for (chksum=0, i=0; i<EEPROM_MAX; i+=2) {
        !           404:       union {
        !           405:        short val;
        !           406:        char c[2];
        !           407:       } tmp;
        !           408: 
        !           409:       tmp.val = (short)Read_EEPROM(iobase, (i>>1));
        !           410:       eeprom_image[i] = tmp.c[0];
        !           411:       eeprom_image[i+1] = tmp.c[1];
        !           412:       chksum += eeprom_image[i] + eeprom_image[i+1];
        !           413:     }
        !           414: 
        !           415:     if (chksum != 0) {                             /* Bad EEPROM Data! */
        !           416:       printk("%s: Device has a bad on-board EEPROM.\n", dev->name);
        !           417:       status = -ENXIO;
        !           418:     } else {
        !           419:       EthwrkSignature(name, eeprom_image);
        !           420:       if (*name != '\0') {                         /* found a EWRK3 device */
        !           421:        dev->base_addr = iobase;
        !           422:       
        !           423:        if (iobase > 0x400) {
        !           424:          outb(eisa_cr, EISA_CR);                  /* Rewrite the EISA CR */
        !           425:        }
        !           426: 
        !           427:        lemac = eeprom_image[EEPROM_CHIPVER];
        !           428:        cmr = inb(EWRK3_CMR);
        !           429: 
        !           430:        if (((lemac == LeMAC) && ((cmr & CMR_NO_EEPROM) != CMR_NO_EEPROM)) ||
        !           431:            ((lemac == LeMAC2) && !(cmr & CMR_HS))) {
        !           432:          printk("%s: %s at %#4lx", dev->name, name, iobase);
        !           433:          hard_strapped = 1;
        !           434:        } else if ((iobase&0x0fff)==EWRK3_EISA_IO_PORTS) {
        !           435:                                                   /* EISA slot address */
        !           436:          printk("%s: %s at %#4lx (EISA slot %ld)", 
        !           437:                                 dev->name, name, iobase, ((iobase>>12)&0x0f));
        !           438:        } else {                                   /* ISA port address */
        !           439:          printk("%s: %s at %#4lx", dev->name, name, iobase);
        !           440:        }
        !           441:        
        !           442:        if (!status) {
        !           443:          printk(", h/w address ");
        !           444:          if (lemac!=LeMAC2) DevicePresent(iobase);/* need after EWRK3_INIT */
        !           445:          status = get_hw_addr(dev, eeprom_image, lemac);
        !           446:          for (i = 0; i < ETH_ALEN - 1; i++) { /* get the ethernet addr. */
        !           447:            printk("%2.2x:", dev->dev_addr[i]);
        !           448:          }
        !           449:          printk("%2.2x,\n", dev->dev_addr[i]);
        !           450: 
        !           451:          if (status) {
        !           452:            printk("      which has an EEPROM CRC error.\n");
        !           453:            status = -ENXIO;
        !           454:          } else {
        !           455:            if (lemac == LeMAC2) {            /* Special LeMAC2 CMR things */
        !           456:              cmr &= ~(CMR_RA | CMR_WB | CMR_LINK | CMR_POLARITY | CMR_0WS);
        !           457:              if (eeprom_image[EEPROM_MISC0] & READ_AHEAD)    cmr |= CMR_RA;
        !           458:              if (eeprom_image[EEPROM_MISC0] & WRITE_BEHIND)  cmr |= CMR_WB;
        !           459:              if (eeprom_image[EEPROM_NETMAN0] & NETMAN_POL)  cmr |= CMR_POLARITY;
        !           460:              if (eeprom_image[EEPROM_NETMAN0] & NETMAN_LINK) cmr |= CMR_LINK;
        !           461:              if (eeprom_image[EEPROM_MISC0] & _0WS_ENA)      cmr |= CMR_0WS;
        !           462:            }
        !           463:            if (eeprom_image[EEPROM_SETUP] & SETUP_DRAM)      cmr |= CMR_DRAM;
        !           464:            outb(cmr, EWRK3_CMR);
        !           465: 
        !           466:            cr = inb(EWRK3_CR);               /* Set up the Control Register */
        !           467:            cr |= eeprom_image[EEPROM_SETUP] & SETUP_APD;
        !           468:            if (cr & SETUP_APD) cr |= eeprom_image[EEPROM_SETUP] & SETUP_PS;
        !           469:            cr |= eeprom_image[EEPROM_MISC0] & FAST_BUS;
        !           470:            cr |= eeprom_image[EEPROM_MISC0] & ENA_16;
        !           471:            outb(cr, EWRK3_CR);
        !           472: 
        !           473:            /* 
        !           474:            ** Determine the base address and window length for the EWRK3
        !           475:            ** RAM from the memory base register.
        !           476:            */
        !           477:            mem_start = inb(EWRK3_MBR);
        !           478:            shmem_length = 0;
        !           479:            if (mem_start != 0) {
        !           480:              if ((mem_start >= 0x0a) && (mem_start <= 0x0f)) {
        !           481:                mem_start *= SHMEM_64K;
        !           482:                shmem_length = SHMEM_64K;
        !           483:              } else if ((mem_start >= 0x14) && (mem_start <= 0x1f)) {
        !           484:                mem_start *= SHMEM_32K;
        !           485:                shmem_length = SHMEM_32K;
        !           486:              } else if ((mem_start >= 0x40) && (mem_start <= 0xff)) {
        !           487:                mem_start = mem_start * SHMEM_2K + 0x80000;
        !           488:                shmem_length = SHMEM_2K;
        !           489:              } else {
        !           490:                status = -ENXIO;
        !           491:              }
        !           492:            }
        !           493:          
        !           494:            /*
        !           495:            ** See the top of this source code for comments about
        !           496:            ** uncommenting this line.
        !           497:            */
        !           498: /*         FORCE_2K_MODE;*/
        !           499: 
        !           500:            if (!status) {
        !           501:              if (hard_strapped) {
        !           502:                printk("      is hard strapped.\n");
        !           503:              } else if (mem_start) {
        !           504:                printk("      has a %dk RAM window", (int)(shmem_length >> 10));
        !           505:                printk(" at 0x%.5lx", mem_start);
        !           506:              } else {
        !           507:                printk("      is in I/O only mode");
        !           508:              }
        !           509:            
        !           510:              /* private area & initialise */
        !           511:              dev->priv = (void *) kmalloc(sizeof(struct ewrk3_private), 
        !           512:                                                                   GFP_KERNEL);
        !           513:              if (dev->priv == NULL) {
        !           514:                return -ENOMEM;
        !           515:              }
        !           516:              lp = (struct ewrk3_private *)dev->priv;
        !           517:              memset(dev->priv, 0, sizeof(struct ewrk3_private));
        !           518:              lp->shmem_base = mem_start;
        !           519:              lp->shmem_length = shmem_length;
        !           520:              lp->lemac = lemac;
        !           521:              lp->hard_strapped = hard_strapped;
        !           522: 
        !           523:              lp->mPage = 64;
        !           524:              if (cmr & CMR_DRAM) lp->mPage <<= 1 ;/* 2 DRAMS on module */ 
        !           525: 
        !           526:              sprintf(lp->adapter_name,"%s (%s)", name, dev->name);
        !           527:              request_region(iobase, EWRK3_TOTAL_SIZE, lp->adapter_name);
        !           528: 
        !           529:              lp->irq_mask = ICR_TNEM|ICR_TXDM|ICR_RNEM|ICR_RXDM;
        !           530:              
        !           531:              if (!hard_strapped) {
        !           532:                /*
        !           533:                ** Enable EWRK3 board interrupts for autoprobing
        !           534:                */
        !           535:                icr |= ICR_IE;                     /* Enable interrupts */
        !           536:                outb(icr, EWRK3_ICR);
        !           537:            
        !           538:                /* The DMA channel may be passed in on this parameter. */
        !           539:                dev->dma = 0;
        !           540:        
        !           541:                /* To auto-IRQ we enable the initialization-done and DMA err,
        !           542:                   interrupts. For now we will always get a DMA error. */
        !           543:                if (dev->irq < 2) {
        !           544: #ifndef MODULE
        !           545:                  u_char irqnum;
        !           546:              
        !           547:                  autoirq_setup(0);
        !           548: 
        !           549:                  /* 
        !           550:                  ** Trigger a TNE interrupt.
        !           551:                  */
        !           552:                  icr |=ICR_TNEM;
        !           553:                  outb(1,EWRK3_TDQ);          /* Write to the TX done queue */
        !           554:                  outb(icr, EWRK3_ICR);       /* Unmask the TXD interrupt */
        !           555:              
        !           556:                  irqnum = irq[((icr & IRQ_SEL) >> 4)];
        !           557:              
        !           558:                  dev->irq = autoirq_report(1);
        !           559:                  if ((dev->irq) && (irqnum == dev->irq)) {
        !           560:                    printk(" and uses IRQ%d.\n", dev->irq);
        !           561:                  } else {
        !           562:                    if (!dev->irq) {
        !           563:                      printk(" and failed to detect IRQ line.\n");
        !           564:                    } else if ((irqnum == 1) && (lemac == LeMAC2)) {
        !           565:                      printk(" and an illegal IRQ line detected.\n");
        !           566:                    } else {
        !           567:                      printk(", but incorrect IRQ line detected.\n");
        !           568:                    }
        !           569:                    status = -ENXIO;
        !           570:                  }
        !           571:                
        !           572:                  DISABLE_IRQs;                 /* Mask all interrupts */
        !           573: 
        !           574: #endif /* MODULE */
        !           575:                } else {
        !           576:                  printk(" and requires IRQ%d.\n", dev->irq);
        !           577:                }
        !           578:              }
        !           579:              if (status) release_region(iobase, EWRK3_TOTAL_SIZE);
        !           580:            } else {
        !           581:              status = -ENXIO;
        !           582:            }
        !           583:          }
        !           584:        }
        !           585:       } else {
        !           586:        status = -ENXIO;
        !           587:       }
        !           588:     }
        !           589: 
        !           590:     if (!status) {
        !           591:       if (ewrk3_debug > 1) {
        !           592:        printk(version);
        !           593:       }
        !           594:       
        !           595:       /* The EWRK3-specific entries in the device structure. */
        !           596:       dev->open = &ewrk3_open;
        !           597:       dev->hard_start_xmit = &ewrk3_queue_pkt;
        !           598:       dev->stop = &ewrk3_close;
        !           599:       dev->get_stats = &ewrk3_get_stats;
        !           600:       dev->set_multicast_list = &set_multicast_list;
        !           601:       dev->do_ioctl = &ewrk3_ioctl;
        !           602: 
        !           603:       dev->mem_start = 0;
        !           604:        
        !           605:       /* Fill in the generic field of the device structure. */
        !           606:       ether_setup(dev);
        !           607:     }
        !           608:   } else {
        !           609:     status = -ENXIO;
        !           610:   }
        !           611: 
        !           612:   return status;
        !           613: }
        !           614: 
        !           615: 
        !           616: static int
        !           617: ewrk3_open(struct device *dev)
        !           618: {
        !           619:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !           620:   u_long iobase = dev->base_addr;
        !           621:   int i, status = 0;
        !           622:   u_char icr, csr;
        !           623: 
        !           624:   /*
        !           625:   ** Stop the TX and RX...
        !           626:   */
        !           627:   STOP_EWRK3;
        !           628: 
        !           629:   if (!lp->hard_strapped) {
        !           630:     irq2dev_map[dev->irq] = dev;                   /* For latched interrupts */
        !           631: 
        !           632:     if (request_irq(dev->irq, (void *)ewrk3_interrupt, 0, "ewrk3", NULL)) {
        !           633:       printk("ewrk3_open(): Requested IRQ%d is busy\n",dev->irq);
        !           634:       status = -EAGAIN;
        !           635:     } else {
        !           636: 
        !           637:       /* 
        !           638:       ** Re-initialize the EWRK3... 
        !           639:       */
        !           640:       ewrk3_init(dev);
        !           641: 
        !           642:       if (ewrk3_debug > 1){
        !           643:        printk("%s: ewrk3 open with irq %d\n",dev->name,dev->irq);
        !           644:        printk("  physical address: ");
        !           645:        for (i=0;i<5;i++){
        !           646:          printk("%2.2x:",(u_char)dev->dev_addr[i]);
        !           647:        }
        !           648:        printk("%2.2x\n",(u_char)dev->dev_addr[i]);
        !           649:        if (lp->shmem_length == 0) {
        !           650:          printk("  no shared memory, I/O only mode\n");
        !           651:        } else {
        !           652:          printk("  start of shared memory: 0x%08lx\n",lp->shmem_base);
        !           653:          printk("  window length: 0x%04lx\n",lp->shmem_length);
        !           654:        }
        !           655:        printk("  # of DRAMS: %d\n",((inb(EWRK3_CMR) & 0x02) ? 2 : 1));
        !           656:        printk("  csr:  0x%02x\n", inb(EWRK3_CSR));
        !           657:        printk("  cr:   0x%02x\n", inb(EWRK3_CR));
        !           658:        printk("  icr:  0x%02x\n", inb(EWRK3_ICR));
        !           659:        printk("  cmr:  0x%02x\n", inb(EWRK3_CMR));
        !           660:        printk("  fmqc: 0x%02x\n", inb(EWRK3_FMQC));
        !           661:       }
        !           662: 
        !           663:       dev->tbusy = 0;                         
        !           664:       dev->start = 1;
        !           665:       dev->interrupt = UNMASK_INTERRUPTS;
        !           666: 
        !           667:       /*
        !           668:       ** Unmask EWRK3 board interrupts
        !           669:       */
        !           670:       icr = inb(EWRK3_ICR);
        !           671:       ENABLE_IRQs;
        !           672: 
        !           673:     }
        !           674:   } else {
        !           675:     dev->start = 0;
        !           676:     dev->tbusy = 1;
        !           677:     printk("%s: ewrk3 available for hard strapped set up only.\n", dev->name);
        !           678:     printk("      Run the 'ewrk3setup' utility or remove the hard straps.\n");
        !           679:   }
        !           680: 
        !           681:   MOD_INC_USE_COUNT;
        !           682: 
        !           683:   return status;
        !           684: }
        !           685: 
        !           686: /*
        !           687: ** Initialize the EtherWORKS 3 operating conditions
        !           688: */
        !           689: static void
        !           690: ewrk3_init(struct device *dev)
        !           691: {
        !           692:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !           693:   u_char csr, page;
        !           694:   u_long iobase = dev->base_addr;
        !           695:   
        !           696:   /* 
        !           697:   ** Enable any multicasts 
        !           698:   */
        !           699:   set_multicast_list(dev);
        !           700: 
        !           701:   /*
        !           702:   ** Clean out any remaining entries in all the queues here
        !           703:   */
        !           704:   while (inb(EWRK3_TQ));
        !           705:   while (inb(EWRK3_TDQ));
        !           706:   while (inb(EWRK3_RQ));
        !           707:   while (inb(EWRK3_FMQ));
        !           708: 
        !           709:   /*
        !           710:   ** Write a clean free memory queue
        !           711:   */
        !           712:   for (page=1;page<lp->mPage;page++) {      /* Write the free page numbers */
        !           713:     outb(page, EWRK3_FMQ);                  /* to the Free Memory Queue */
        !           714:   }
        !           715: 
        !           716:   lp->lock = 0;                             /* Ensure there are no locks */
        !           717: 
        !           718:   START_EWRK3;                              /* Enable the TX and/or RX */
        !           719: }
        !           720: 
        !           721: /* 
        !           722: ** Writes a socket buffer to the free page queue
        !           723: */
        !           724: static int
        !           725: ewrk3_queue_pkt(struct sk_buff *skb, struct device *dev)
        !           726: {
        !           727:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !           728:   u_long iobase = dev->base_addr;
        !           729:   int status = 0;
        !           730:   u_char icr, csr;
        !           731: 
        !           732:   /* Transmitter timeout, serious problems. */
        !           733:   if (dev->tbusy || lp->lock) {
        !           734:     int tickssofar = jiffies - dev->trans_start;
        !           735:     if (tickssofar < QUEUE_PKT_TIMEOUT) {
        !           736:       status = -1;
        !           737:     } else if (!lp->hard_strapped) {
        !           738:       printk("%s: transmit timed/locked out, status %04x, resetting.\n",
        !           739:                                                   dev->name, inb(EWRK3_CSR));
        !           740:        
        !           741:       /*
        !           742:       ** Mask all board interrupts
        !           743:       */
        !           744:       DISABLE_IRQs;
        !           745: 
        !           746:       /*
        !           747:       ** Stop the TX and RX...
        !           748:       */
        !           749:       STOP_EWRK3;
        !           750: 
        !           751:       ewrk3_init(dev);
        !           752: 
        !           753:       /*
        !           754:       ** Unmask EWRK3 board interrupts
        !           755:       */
        !           756:       ENABLE_IRQs;
        !           757: 
        !           758:       dev->tbusy=0;
        !           759:       dev->trans_start = jiffies;
        !           760:       dev_kfree_skb(skb, FREE_WRITE);
        !           761:     }
        !           762:   } else if (skb == NULL) {
        !           763:     dev_tint(dev);
        !           764:   } else if (skb->len > 0) {
        !           765: 
        !           766:     /* 
        !           767:     ** Block a timer-based transmit from overlapping.  This could better be
        !           768:     ** done with atomic_swap(1, dev->tbusy), but set_bit() works as well. 
        !           769:     */
        !           770:     if (set_bit(0, (void*)&dev->tbusy) != 0)
        !           771:       printk("%s: Transmitter access conflict.\n", dev->name);
        !           772: 
        !           773:     DISABLE_IRQs;                      /* So that the page # remains correct */
        !           774:     
        !           775:     /* 
        !           776:     ** Get a free page from the FMQ when resources are available
        !           777:     */
        !           778:     if (inb(EWRK3_FMQC) > 0) {
        !           779:       u_long buf = 0;
        !           780:       u_char page;
        !           781: 
        !           782:       if ((page = inb(EWRK3_FMQ)) < lp->mPage) {
        !           783:        /*
        !           784:        ** Set up shared memory window and pointer into the window
        !           785:        */
        !           786:        while (set_bit(0, (void *)&lp->lock) != 0); /* Wait for lock to free */
        !           787:        if (lp->shmem_length == IO_ONLY) {
        !           788:          outb(page, EWRK3_IOPR);
        !           789:        } else if (lp->shmem_length == SHMEM_2K) {
        !           790:          buf = lp->shmem_base;
        !           791:          outb(page, EWRK3_MPR);
        !           792:        } else if (lp->shmem_length == SHMEM_32K) {
        !           793:          buf = ((((short)page << 11) & 0x7800) + lp->shmem_base);
        !           794:          outb((page >> 4), EWRK3_MPR);
        !           795:        } else if (lp->shmem_length == SHMEM_64K) {
        !           796:          buf = ((((short)page << 11) & 0xf800) + lp->shmem_base);
        !           797:          outb((page >> 5), EWRK3_MPR);
        !           798:        } else {
        !           799:          status = -1;
        !           800:          printk("%s: Oops - your private data area is hosed!\n",dev->name);
        !           801:        }
        !           802: 
        !           803:        if (!status) {
        !           804: 
        !           805:           /* 
        !           806:          ** Set up the buffer control structures and copy the data from
        !           807:          ** the socket buffer to the shared memory .
        !           808:          */
        !           809: 
        !           810:          if (lp->shmem_length == IO_ONLY) {
        !           811:            int i;
        !           812:            u_char *p = skb->data;
        !           813:            
        !           814:            outb((char)(TCR_QMODE | TCR_PAD | TCR_IFC), EWRK3_DATA);
        !           815:            outb((char)(skb->len & 0xff), EWRK3_DATA);
        !           816:            outb((char)((skb->len >> 8) & 0xff), EWRK3_DATA);
        !           817:            outb((char)0x04, EWRK3_DATA);
        !           818:            for (i=0; i<skb->len; i++) {
        !           819:              outb(*p++, EWRK3_DATA);
        !           820:            }
        !           821:            outb(page, EWRK3_TQ);                      /* Start sending pkt */
        !           822:          } else {
        !           823:            writeb((char)(TCR_QMODE|TCR_PAD|TCR_IFC), (char *)buf);/* ctrl byte*/
        !           824:            buf+=1;
        !           825:            writeb((char)(skb->len & 0xff), (char *)buf);/* length (16 bit xfer)*/
        !           826:            buf+=1;
        !           827:            if (lp->txc) {
        !           828:              writeb((char)(((skb->len >> 8) & 0xff) | XCT), (char *)buf);
        !           829:              buf+=1;
        !           830:              writeb(0x04, (char *)buf);               /* index byte */
        !           831:              buf+=1;
        !           832:              writeb(0x00, (char *)(buf + skb->len));  /* Write the XCT flag */
        !           833:              memcpy_toio(buf, skb->data, PRELOAD);/* Write PRELOAD bytes*/
        !           834:              outb(page, EWRK3_TQ);                    /* Start sending pkt */
        !           835:              memcpy_toio(buf+PRELOAD, skb->data+PRELOAD, skb->len-PRELOAD);
        !           836:              writeb(0xff, (char *)(buf + skb->len));  /* Write the XCT flag */
        !           837:            } else {
        !           838:              writeb((char)((skb->len >> 8) & 0xff), (char *)buf);
        !           839:              buf+=1;
        !           840:              writeb(0x04, (char *)buf);               /* index byte */
        !           841:              buf+=1;
        !           842:              memcpy_toio((char *)buf, skb->data, skb->len);/* Write data bytes */
        !           843:              outb(page, EWRK3_TQ);                    /* Start sending pkt */
        !           844:            }
        !           845:          }
        !           846: 
        !           847:          dev->trans_start = jiffies;
        !           848:          dev_kfree_skb (skb, FREE_WRITE);
        !           849: 
        !           850:         } else {              /* return unused page to the free memory queue */
        !           851:          outb(page, EWRK3_FMQ);
        !           852:        }
        !           853:        lp->lock = 0;         /* unlock the page register */
        !           854:       } else {
        !           855:        printk("ewrk3_queue_pkt(): Invalid free memory page (%d).\n",
        !           856:                                                         (u_char) page);
        !           857:       }
        !           858:     } else {
        !           859:       printk("ewrk3_queue_pkt(): No free resources...\n");
        !           860:       printk("ewrk3_queue_pkt(): CSR: %02x ICR: %02x FMQC: %02x\n",inb(EWRK3_CSR),inb(EWRK3_ICR),inb(EWRK3_FMQC));
        !           861:     }
        !           862:     
        !           863:     /* Check for free resources: clear 'tbusy' if there are some */
        !           864:     if (inb(EWRK3_FMQC) > 0) {
        !           865:       dev->tbusy = 0;
        !           866:     }
        !           867: 
        !           868:     ENABLE_IRQs;
        !           869:   }
        !           870: 
        !           871:   return status;
        !           872: }
        !           873: 
        !           874: /*
        !           875: ** The EWRK3 interrupt handler. 
        !           876: */
        !           877: static void
        !           878: ewrk3_interrupt(int irq, void *dev_id, struct pt_regs * regs)
        !           879: {
        !           880:     struct device *dev = (struct device *)(irq2dev_map[irq]);
        !           881:     struct ewrk3_private *lp;
        !           882:     u_long iobase;
        !           883:     u_char icr, cr, csr;
        !           884: 
        !           885:     if (dev == NULL) {
        !           886:        printk ("ewrk3_interrupt(): irq %d for unknown device.\n", irq);
        !           887:     } else {
        !           888:       lp = (struct ewrk3_private *)dev->priv;
        !           889:       iobase = dev->base_addr;
        !           890: 
        !           891:       if (dev->interrupt)
        !           892:        printk("%s: Re-entering the interrupt handler.\n", dev->name);
        !           893: 
        !           894:       dev->interrupt = MASK_INTERRUPTS;
        !           895: 
        !           896:       /* get the interrupt information */
        !           897:       csr = inb(EWRK3_CSR);
        !           898: 
        !           899:       /* 
        !           900:       ** Mask the EWRK3 board interrupts and turn on the LED 
        !           901:       */
        !           902:       DISABLE_IRQs;
        !           903: 
        !           904:       cr = inb(EWRK3_CR);
        !           905:       cr |= CR_LED;
        !           906:       outb(cr, EWRK3_CR);
        !           907: 
        !           908:       if (csr & CSR_RNE)         /* Rx interrupt (packet[s] arrived) */
        !           909:        ewrk3_rx(dev);
        !           910: 
        !           911:       if (csr & CSR_TNE)          /* Tx interrupt (packet sent) */
        !           912:         ewrk3_tx(dev);
        !           913: 
        !           914:       /*
        !           915:       ** Now deal with the TX/RX disable flags. These are set when there
        !           916:       ** are no more resources. If resources free up then enable these
        !           917:       ** interrupts, otherwise mask them - failure to do this will result
        !           918:       ** in the system hanging in an interrupt loop.
        !           919:       */
        !           920:       if (inb(EWRK3_FMQC)) {      /* any resources available? */
        !           921:        lp->irq_mask |= ICR_TXDM|ICR_RXDM;/* enable the interrupt source */
        !           922:        csr &= ~(CSR_TXD|CSR_RXD);/* ensure restart of a stalled TX or RX */
        !           923:        outb(csr, EWRK3_CSR);
        !           924:        dev->tbusy = 0;           /* clear TX busy flag */
        !           925:        mark_bh(NET_BH);
        !           926:       } else {
        !           927:        lp->irq_mask &= ~(ICR_TXDM|ICR_RXDM);/* disable the interrupt source */
        !           928:       }
        !           929: 
        !           930:       /* Unmask the EWRK3 board interrupts and turn off the LED */
        !           931:       cr &= ~CR_LED;
        !           932:       outb(cr, EWRK3_CR);
        !           933: 
        !           934:       dev->interrupt = UNMASK_INTERRUPTS;
        !           935:       ENABLE_IRQs;
        !           936:     }
        !           937: 
        !           938:     return;
        !           939: }
        !           940: 
        !           941: static int
        !           942: ewrk3_rx(struct device *dev)
        !           943: {
        !           944:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !           945:   u_long iobase = dev->base_addr;
        !           946:   int i, status = 0;
        !           947:   u_char page, tmpPage = 0, tmpLock = 0;
        !           948:   u_long buf = 0;
        !           949: 
        !           950:   while (inb(EWRK3_RQC) && !status) {        /* Whilst there's incoming data */
        !           951:     if ((page = inb(EWRK3_RQ)) < lp->mPage) {/* Get next entry's buffer page */
        !           952:       /*
        !           953:       ** Preempt any process using the current page register. Check for
        !           954:       ** an existing lock to reduce time taken in I/O transactions.
        !           955:       */
        !           956:       if ((tmpLock = set_bit(0, (void *)&lp->lock)) == 1) {   /* Assert lock */
        !           957:        if (lp->shmem_length == IO_ONLY) {              /* Get existing page */
        !           958:          tmpPage = inb(EWRK3_IOPR);
        !           959:        } else {
        !           960:          tmpPage = inb(EWRK3_MPR);
        !           961:        }
        !           962:       }
        !           963: 
        !           964:       /*
        !           965:       ** Set up shared memory window and pointer into the window
        !           966:       */
        !           967:       if (lp->shmem_length == IO_ONLY) {
        !           968:        outb(page, EWRK3_IOPR);
        !           969:       } else if (lp->shmem_length == SHMEM_2K) {
        !           970:        buf = lp->shmem_base;
        !           971:        outb(page, EWRK3_MPR);
        !           972:       } else if (lp->shmem_length == SHMEM_32K) {
        !           973:        buf = ((((short)page << 11) & 0x7800) + lp->shmem_base);
        !           974:        outb((page >> 4), EWRK3_MPR);
        !           975:       } else if (lp->shmem_length == SHMEM_64K) {
        !           976:        buf = ((((short)page << 11) & 0xf800) + lp->shmem_base);
        !           977:        outb((page >> 5), EWRK3_MPR);
        !           978:       } else {
        !           979:        status = -1;
        !           980:        printk("%s: Oops - your private data area is hosed!\n",dev->name);
        !           981:       }
        !           982: 
        !           983:       if (!status) {
        !           984:        char rx_status;
        !           985:        int pkt_len;
        !           986: 
        !           987:        if (lp->shmem_length == IO_ONLY) {
        !           988:          rx_status = inb(EWRK3_DATA);
        !           989:          pkt_len = inb(EWRK3_DATA);
        !           990:          pkt_len |= ((u_short)inb(EWRK3_DATA) << 8);
        !           991:        } else {
        !           992:          rx_status = readb(buf);
        !           993:          buf+=1;
        !           994:          pkt_len = readw(buf);
        !           995:          buf+=3;
        !           996:        }
        !           997: 
        !           998:        if (!(rx_status & R_ROK)) {         /* There was an error. */
        !           999:          lp->stats.rx_errors++;            /* Update the error stats. */
        !          1000:          if (rx_status & R_DBE) lp->stats.rx_frame_errors++;
        !          1001:          if (rx_status & R_CRC) lp->stats.rx_crc_errors++;
        !          1002:          if (rx_status & R_PLL) lp->stats.rx_fifo_errors++;
        !          1003:        } else {
        !          1004:          struct sk_buff *skb;
        !          1005: 
        !          1006:           if ((skb = dev_alloc_skb(pkt_len+2)) != NULL) {
        !          1007:             unsigned char *p;
        !          1008:            skb->dev = dev;
        !          1009:            skb_reserve(skb,2);             /* Align to 16 bytes */
        !          1010:            p = skb_put(skb,pkt_len);
        !          1011: 
        !          1012:            if (lp->shmem_length == IO_ONLY) {
        !          1013:              *p = inb(EWRK3_DATA);         /* dummy read */
        !          1014:              for (i=0; i<pkt_len; i++) {
        !          1015:                *p++ = inb(EWRK3_DATA);
        !          1016:              }
        !          1017:            } else {
        !          1018:              memcpy_fromio(p, buf, pkt_len);
        !          1019:            }
        !          1020: 
        !          1021:            /* 
        !          1022:            ** Notify the upper protocol layers that there is another 
        !          1023:            ** packet to handle
        !          1024:            */
        !          1025:            skb->protocol=eth_type_trans(skb,dev);
        !          1026:            netif_rx(skb);
        !          1027: 
        !          1028:            /*
        !          1029:            ** Update stats
        !          1030:            */
        !          1031:            lp->stats.rx_packets++;
        !          1032:            for (i=1; i<EWRK3_PKT_STAT_SZ-1; i++) {
        !          1033:              if (pkt_len < i*EWRK3_PKT_BIN_SZ) {
        !          1034:                lp->pktStats.bins[i]++;
        !          1035:                i = EWRK3_PKT_STAT_SZ;
        !          1036:              }
        !          1037:            }
        !          1038:            p = skb->data;                  /* Look at the dest addr */
        !          1039:            if (p[0] & 0x01) {              /* Multicast/Broadcast */
        !          1040:              if ((*(s32 *)&p[0] == -1) && (*(s16 *)&p[4] == -1)) {
        !          1041:                lp->pktStats.broadcast++;
        !          1042:              } else {
        !          1043:                lp->pktStats.multicast++;
        !          1044:              }
        !          1045:            } else if ((*(s32 *)&p[0] == *(s32 *)&dev->dev_addr[0]) &&
        !          1046:                       (*(s16 *)&p[4] == *(s16 *)&dev->dev_addr[4])) {
        !          1047:              lp->pktStats.unicast++;
        !          1048:            }
        !          1049: 
        !          1050:            lp->pktStats.bins[0]++;           /* Duplicates stats.rx_packets */
        !          1051:            if (lp->pktStats.bins[0] == 0) {  /* Reset counters */
        !          1052:              memset(&lp->pktStats, 0, sizeof(lp->pktStats));
        !          1053:            }
        !          1054:          } else {
        !          1055:            printk("%s: Insufficient memory; nuking packet.\n", dev->name);
        !          1056:            lp->stats.rx_dropped++;           /* Really, deferred. */
        !          1057:            break;
        !          1058:          }
        !          1059:         }
        !          1060:       }
        !          1061:       /*
        !          1062:       ** Return the received buffer to the free memory queue
        !          1063:       */
        !          1064:       outb(page, EWRK3_FMQ);
        !          1065: 
        !          1066:       if (tmpLock) {                          /* If a lock was preempted */
        !          1067:        if (lp->shmem_length == IO_ONLY) {    /* Replace old page */
        !          1068:          outb(tmpPage, EWRK3_IOPR);
        !          1069:        } else {
        !          1070:          outb(tmpPage, EWRK3_MPR);
        !          1071:        }
        !          1072:       }
        !          1073:       lp->lock = 0;                           /* Unlock the page register */
        !          1074:     } else {
        !          1075:       printk("ewrk3_rx(): Illegal page number, page %d\n",page);
        !          1076:       printk("ewrk3_rx(): CSR: %02x ICR: %02x FMQC: %02x\n",inb(EWRK3_CSR),inb(EWRK3_ICR),inb(EWRK3_FMQC));
        !          1077:     }
        !          1078:   }
        !          1079:   return status;
        !          1080: }
        !          1081: 
        !          1082: /*
        !          1083: ** Buffer sent - check for TX buffer errors.
        !          1084: */
        !          1085: static int
        !          1086: ewrk3_tx(struct device *dev)
        !          1087: {
        !          1088:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !          1089:   u_long iobase = dev->base_addr;
        !          1090:   u_char tx_status;
        !          1091: 
        !          1092:   while ((tx_status = inb(EWRK3_TDQ)) > 0) {  /* Whilst there's old buffers */
        !          1093:     if (tx_status & T_VSTS) {                 /* The status is valid */
        !          1094:       if (tx_status & T_TXE) {
        !          1095:        lp->stats.tx_errors++;
        !          1096:        if (tx_status & T_NCL)    lp->stats.tx_carrier_errors++;
        !          1097:        if (tx_status & T_LCL)    lp->stats.tx_window_errors++;
        !          1098:        if (tx_status & T_CTU) {
        !          1099:          if ((tx_status & T_COLL) ^ T_XUR) {
        !          1100:            lp->pktStats.tx_underruns++;
        !          1101:          } else {
        !          1102:            lp->pktStats.excessive_underruns++;
        !          1103:          }
        !          1104:        } else  if (tx_status & T_COLL) {
        !          1105:          if ((tx_status & T_COLL) ^ T_XCOLL) {
        !          1106:            lp->stats.collisions++;
        !          1107:          } else {
        !          1108:            lp->pktStats.excessive_collisions++;
        !          1109:          }
        !          1110:        }
        !          1111:       } else {
        !          1112:        lp->stats.tx_packets++;
        !          1113:       }
        !          1114:     }
        !          1115:   }
        !          1116: 
        !          1117:   return 0;
        !          1118: }
        !          1119: 
        !          1120: static int
        !          1121: ewrk3_close(struct device *dev)
        !          1122: {
        !          1123:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !          1124:   u_long iobase = dev->base_addr;
        !          1125:   u_char icr, csr;
        !          1126: 
        !          1127:   dev->start = 0;
        !          1128:   dev->tbusy = 1;
        !          1129: 
        !          1130:   if (ewrk3_debug > 1) {
        !          1131:     printk("%s: Shutting down ethercard, status was %2.2x.\n",
        !          1132:           dev->name, inb(EWRK3_CSR));
        !          1133:   }
        !          1134: 
        !          1135:   /* 
        !          1136:   ** We stop the EWRK3 here... mask interrupts and stop TX & RX
        !          1137:   */
        !          1138:   DISABLE_IRQs;
        !          1139: 
        !          1140:   STOP_EWRK3;
        !          1141: 
        !          1142:   /*
        !          1143:   ** Clean out the TX and RX queues here (note that one entry
        !          1144:   ** may get added to either the TXD or RX queues if the TX or RX
        !          1145:   ** just starts processing a packet before the STOP_EWRK3 command
        !          1146:   ** is received. This will be flushed in the ewrk3_open() call).
        !          1147:   */
        !          1148:   while (inb(EWRK3_TQ));
        !          1149:   while (inb(EWRK3_TDQ));
        !          1150:   while (inb(EWRK3_RQ));
        !          1151: 
        !          1152:   if (!lp->hard_strapped) {
        !          1153:     free_irq(dev->irq, NULL);
        !          1154:     
        !          1155:     irq2dev_map[dev->irq] = 0;
        !          1156:   }
        !          1157: 
        !          1158:   MOD_DEC_USE_COUNT;
        !          1159: 
        !          1160:   return 0;
        !          1161: }
        !          1162: 
        !          1163: static struct enet_statistics *
        !          1164: ewrk3_get_stats(struct device *dev)
        !          1165: {
        !          1166:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !          1167: 
        !          1168:   /* Null body since there is no framing error counter */
        !          1169:     
        !          1170:   return &lp->stats;
        !          1171: }
        !          1172: 
        !          1173: /*
        !          1174: ** Set or clear the multicast filter for this adapter.
        !          1175: */
        !          1176: static void
        !          1177: set_multicast_list(struct device *dev)
        !          1178: {
        !          1179:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !          1180:   u_long iobase = dev->base_addr;
        !          1181:   u_char csr;
        !          1182: 
        !          1183:   if (irq2dev_map[dev->irq] != NULL) {
        !          1184:     csr = inb(EWRK3_CSR);
        !          1185:     
        !          1186:     if (lp->shmem_length == IO_ONLY) {
        !          1187:       lp->mctbl = (char *) PAGE0_HTE;
        !          1188:     } else {
        !          1189:       lp->mctbl = (char *)(lp->shmem_base + PAGE0_HTE);
        !          1190:     }
        !          1191: 
        !          1192:     csr &= ~(CSR_PME | CSR_MCE);
        !          1193:     if (dev->flags & IFF_PROMISC) {         /* set promiscuous mode */
        !          1194:       csr |= CSR_PME;
        !          1195:       outb(csr, EWRK3_CSR);
        !          1196:     } else {
        !          1197:       SetMulticastFilter(dev);
        !          1198:       csr |= CSR_MCE;
        !          1199:       outb(csr, EWRK3_CSR);
        !          1200:     }
        !          1201:   }
        !          1202: }
        !          1203: 
        !          1204: /*
        !          1205: ** Calculate the hash code and update the logical address filter
        !          1206: ** from a list of ethernet multicast addresses.
        !          1207: ** Little endian crc one liner from Matt Thomas, DEC.
        !          1208: **
        !          1209: ** Note that when clearing the table, the broadcast bit must remain asserted
        !          1210: ** to receive broadcast messages.
        !          1211: */
        !          1212: static void SetMulticastFilter(struct device *dev)
        !          1213: {
        !          1214:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !          1215:   struct dev_mc_list *dmi=dev->mc_list;
        !          1216:   u_long iobase = dev->base_addr;
        !          1217:   int i;
        !          1218:   char *addrs, j, bit, byte;
        !          1219:   short *p = (short *) lp->mctbl;
        !          1220:   u16 hashcode;
        !          1221:   s32 crc, poly = CRC_POLYNOMIAL_LE;
        !          1222: 
        !          1223:   while (set_bit(0, (void *)&lp->lock) != 0); /* Wait for lock to free */
        !          1224: 
        !          1225:   if (lp->shmem_length == IO_ONLY) {
        !          1226:     outb(0, EWRK3_IOPR);
        !          1227:     outw(EEPROM_OFFSET(lp->mctbl), EWRK3_PIR1);
        !          1228:   } else {
        !          1229:     outb(0, EWRK3_MPR);
        !          1230:   }
        !          1231: 
        !          1232:   if (dev->flags & IFF_ALLMULTI) {
        !          1233:     for (i=0; i<(HASH_TABLE_LEN >> 3); i++) {
        !          1234:       if (lp->shmem_length == IO_ONLY) {
        !          1235:        outb(0xff, EWRK3_DATA);
        !          1236:       } else {                /* memset didn't work here */
        !          1237:        writew(0xffff, p);
        !          1238:        p++; i++;
        !          1239:       }
        !          1240:     }
        !          1241:   } else {
        !          1242:     /* Clear table except for broadcast bit */
        !          1243:     if (lp->shmem_length == IO_ONLY) {
        !          1244:       for (i=0; i<(HASH_TABLE_LEN >> 4) - 1; i++) {
        !          1245:        outb(0x00, EWRK3_DATA);
        !          1246:       } 
        !          1247:       outb(0x80, EWRK3_DATA); i++;           /* insert the broadcast bit */
        !          1248:       for (; i<(HASH_TABLE_LEN >> 3); i++) {
        !          1249:        outb(0x00, EWRK3_DATA);
        !          1250:       } 
        !          1251:     } else {
        !          1252:       memset_io(lp->mctbl, 0, (HASH_TABLE_LEN >> 3));
        !          1253:       writeb(0x80, (char *)(lp->mctbl + (HASH_TABLE_LEN >> 4) - 1));
        !          1254:     }
        !          1255: 
        !          1256:     /* Update table */
        !          1257:     for (i=0;i<dev->mc_count;i++) {          /* for each address in the list */
        !          1258:       addrs=dmi->dmi_addr;
        !          1259:       dmi=dmi->next;
        !          1260:       if ((*addrs & 0x01) == 1) {            /* multicast address? */ 
        !          1261:        crc = 0xffffffff;                    /* init CRC for each address */
        !          1262:        for (byte=0;byte<ETH_ALEN;byte++) {  /* for each address byte */
        !          1263:                                             /* process each address bit */ 
        !          1264:          for (bit = *addrs++,j=0;j<8;j++, bit>>=1) {
        !          1265:            crc = (crc >> 1) ^ (((crc ^ bit) & 0x01) ? poly : 0);
        !          1266:          }
        !          1267:        }
        !          1268:        hashcode = crc & ((1 << 9) - 1);     /* hashcode is 9 LSb of CRC */
        !          1269: 
        !          1270:        byte = hashcode >> 3;                /* bit[3-8] -> byte in filter */
        !          1271:        bit = 1 << (hashcode & 0x07);        /* bit[0-2] -> bit in byte */
        !          1272: 
        !          1273:        if (lp->shmem_length == IO_ONLY) {
        !          1274:          u_char tmp;
        !          1275: 
        !          1276:          outw((short)((long)lp->mctbl) + byte, EWRK3_PIR1);
        !          1277:          tmp = inb(EWRK3_DATA);
        !          1278:          tmp |= bit;
        !          1279:          outw((short)((long)lp->mctbl) + byte, EWRK3_PIR1);
        !          1280:          outb(tmp, EWRK3_DATA); 
        !          1281:        } else {
        !          1282:          writeb(readb(lp->mctbl + byte) | bit, lp->mctbl + byte);
        !          1283:        }
        !          1284:       }
        !          1285:     }
        !          1286:   }
        !          1287: 
        !          1288:   lp->lock = 0;                              /* Unlock the page register */
        !          1289: 
        !          1290:   return;
        !          1291: }
        !          1292: 
        !          1293: /*
        !          1294: ** ISA bus I/O device probe
        !          1295: */
        !          1296: static void isa_probe(struct device *dev, u_long ioaddr)
        !          1297: {
        !          1298:   int i = num_ewrk3s, maxSlots;
        !          1299:   u_long iobase;
        !          1300: 
        !          1301:   if (!ioaddr && autoprobed) return ;            /* Been here before ! */
        !          1302:   if (ioaddr >= 0x400) return;                   /* Not ISA */
        !          1303: 
        !          1304:   if (ioaddr == 0) {                     /* Autoprobing */
        !          1305:     iobase = EWRK3_IO_BASE;              /* Get the first slot address */
        !          1306:     maxSlots = 24;
        !          1307:   } else {                               /* Probe a specific location */
        !          1308:     iobase = ioaddr;
        !          1309:     maxSlots = i + 1;
        !          1310:   }
        !          1311: 
        !          1312:   for (; (i<maxSlots) && (dev!=NULL);iobase+=EWRK3_IOP_INC, i++) {
        !          1313:     if (!check_region(iobase, EWRK3_TOTAL_SIZE)) {    
        !          1314:       if (DevicePresent(iobase) == 0) {
        !          1315:        if ((dev = alloc_device(dev, iobase)) != NULL) {
        !          1316:          if (ewrk3_hw_init(dev, iobase) == 0) {
        !          1317:            num_ewrk3s++;
        !          1318:          }
        !          1319:          num_eth++;
        !          1320:        }
        !          1321:       }
        !          1322:     } else if (autoprobed) {
        !          1323:       printk("%s: region already allocated at 0x%04lx.\n", dev->name, iobase);
        !          1324:     }
        !          1325:   }
        !          1326: 
        !          1327:   return;
        !          1328: }
        !          1329: 
        !          1330: /*
        !          1331: ** EISA bus I/O device probe. Probe from slot 1 since slot 0 is usually
        !          1332: ** the motherboard.
        !          1333: */
        !          1334: static void eisa_probe(struct device *dev, u_long ioaddr)
        !          1335: {
        !          1336:   int i, maxSlots;
        !          1337:   u_long iobase;
        !          1338:   char name[EWRK3_STRLEN];
        !          1339: 
        !          1340:   if (!ioaddr && autoprobed) return ;            /* Been here before ! */
        !          1341:   if (ioaddr < 0x1000) return;                   /* Not EISA */
        !          1342: 
        !          1343:   if (ioaddr == 0) {                     /* Autoprobing */
        !          1344:     iobase = EISA_SLOT_INC;              /* Get the first slot address */
        !          1345:     i = 1;
        !          1346:     maxSlots = MAX_EISA_SLOTS;
        !          1347:   } else {                               /* Probe a specific location */
        !          1348:     iobase = ioaddr;
        !          1349:     i = (ioaddr >> 12);
        !          1350:     maxSlots = i + 1;
        !          1351:   }
        !          1352: 
        !          1353:   for (i=1; (i<maxSlots) && (dev!=NULL); i++, iobase+=EISA_SLOT_INC) {
        !          1354:     if (EISA_signature(name, EISA_ID) == 0) {
        !          1355:       if (!check_region(iobase, EWRK3_TOTAL_SIZE)) {
        !          1356:        if (DevicePresent(iobase) == 0) {
        !          1357:          if ((dev = alloc_device(dev, iobase)) != NULL) {
        !          1358:            if (ewrk3_hw_init(dev, iobase) == 0) {
        !          1359:              num_ewrk3s++;
        !          1360:            }
        !          1361:            num_eth++;
        !          1362:          }
        !          1363:        }
        !          1364:       } else if (autoprobed) {
        !          1365:        printk("%s: region already allocated at 0x%04lx.\n", dev->name, iobase);
        !          1366:       }
        !          1367:     }
        !          1368:   }
        !          1369: 
        !          1370:   return;
        !          1371: }
        !          1372: 
        !          1373: /*
        !          1374: ** Search the entire 'eth' device list for a fixed probe. If a match isn't
        !          1375: ** found then check for an autoprobe or unused device location. If they
        !          1376: ** are not available then insert a new device structure at the end of
        !          1377: ** the current list.
        !          1378: */
        !          1379: static struct device *
        !          1380: alloc_device(struct device *dev, u_long iobase)
        !          1381: {
        !          1382:     struct device *adev = NULL;
        !          1383:     int fixed = 0, new_dev = 0;
        !          1384: 
        !          1385:     num_eth = ewrk3_dev_index(dev->name);
        !          1386:     if (loading_module) return dev;
        !          1387:     
        !          1388:     while (1) {
        !          1389:        if (((dev->base_addr == EWRK3_NDA) || (dev->base_addr==0)) && !adev) {
        !          1390:            adev=dev;
        !          1391:        } else if ((dev->priv == NULL) && (dev->base_addr==iobase)) {
        !          1392:            fixed = 1;
        !          1393:        } else {
        !          1394:            if (dev->next == NULL) {
        !          1395:                new_dev = 1;
        !          1396:            } else if (strncmp(dev->next->name, "eth", 3) != 0) {
        !          1397:                new_dev = 1;
        !          1398:            }
        !          1399:        }
        !          1400:        if ((dev->next == NULL) || new_dev || fixed) break;
        !          1401:        dev = dev->next;
        !          1402:        num_eth++;
        !          1403:     }
        !          1404:     if (adev && !fixed) {
        !          1405:        dev = adev;
        !          1406:        num_eth = ewrk3_dev_index(dev->name);
        !          1407:        new_dev = 0;
        !          1408:     }
        !          1409: 
        !          1410:     if (((dev->next == NULL) &&  
        !          1411:        ((dev->base_addr != EWRK3_NDA) && (dev->base_addr != 0)) && !fixed) ||
        !          1412:        new_dev) {
        !          1413:        num_eth++;                         /* New device */
        !          1414:        dev = insert_device(dev, iobase, ewrk3_probe);
        !          1415:     }
        !          1416:     
        !          1417:     return dev;
        !          1418: }
        !          1419: 
        !          1420: /*
        !          1421: ** If at end of eth device list and can't use current entry, malloc
        !          1422: ** one up. If memory could not be allocated, print an error message.
        !          1423: */
        !          1424: static struct device *
        !          1425: insert_device(struct device *dev, u_long iobase, int (*init)(struct device *))
        !          1426: {
        !          1427:     struct device *new;
        !          1428: 
        !          1429:     new = (struct device *)kmalloc(sizeof(struct device)+8, GFP_KERNEL);
        !          1430:     if (new == NULL) {
        !          1431:        printk("eth%d: Device not initialised, insufficient memory\n",num_eth);
        !          1432:        return NULL;
        !          1433:     } else {
        !          1434:        new->next = dev->next;
        !          1435:        dev->next = new;
        !          1436:        dev = dev->next;               /* point to the new device */
        !          1437:        dev->name = (char *)(dev + 1);
        !          1438:        if (num_eth > 9999) {
        !          1439:            sprintf(dev->name,"eth????");/* New device name */
        !          1440:        } else {
        !          1441:            sprintf(dev->name,"eth%d", num_eth);/* New device name */
        !          1442:        }
        !          1443:        dev->base_addr = iobase;       /* assign the io address */
        !          1444:        dev->init = init;              /* initialisation routine */
        !          1445:     }
        !          1446: 
        !          1447:     return dev;
        !          1448: }
        !          1449: 
        !          1450: static int
        !          1451: ewrk3_dev_index(char *s)
        !          1452: {
        !          1453:     int i=0, j=0;
        !          1454: 
        !          1455:     for (;*s; s++) {
        !          1456:        if (isdigit(*s)) {
        !          1457:            j=1;
        !          1458:            i = (i * 10) + (*s - '0');
        !          1459:        } else if (j) break;
        !          1460:     }
        !          1461: 
        !          1462:     return i;
        !          1463: }
        !          1464: 
        !          1465: /*
        !          1466: ** Read the EWRK3 EEPROM using this routine
        !          1467: */
        !          1468: static int Read_EEPROM(u_long iobase, u_char eaddr)
        !          1469: {
        !          1470:   int i;
        !          1471: 
        !          1472:   outb((eaddr & 0x3f), EWRK3_PIR1);     /* set up 6 bits of address info */
        !          1473:   outb(EEPROM_RD, EWRK3_IOPR);          /* issue read command */
        !          1474:   for (i=0;i<5000;i++) inb(EWRK3_CSR);  /* wait 1msec */
        !          1475: 
        !          1476:   return inw(EWRK3_EPROM1);             /* 16 bits data return */
        !          1477: }
        !          1478: 
        !          1479: /*
        !          1480: ** Write the EWRK3 EEPROM using this routine
        !          1481: */
        !          1482: static int Write_EEPROM(short data, u_long iobase, u_char eaddr)
        !          1483: {
        !          1484:   int i;
        !          1485: 
        !          1486:   outb(EEPROM_WR_EN, EWRK3_IOPR);       /* issue write enable command */
        !          1487:   for (i=0;i<5000;i++) inb(EWRK3_CSR);  /* wait 1msec */
        !          1488:   outw(data, EWRK3_EPROM1);             /* write data to register */
        !          1489:   outb((eaddr & 0x3f), EWRK3_PIR1);     /* set up 6 bits of address info */
        !          1490:   outb(EEPROM_WR, EWRK3_IOPR);          /* issue write command */
        !          1491:   for (i=0;i<75000;i++) inb(EWRK3_CSR); /* wait 15msec */
        !          1492:   outb(EEPROM_WR_DIS, EWRK3_IOPR);      /* issue write disable command */
        !          1493:   for (i=0;i<5000;i++) inb(EWRK3_CSR);  /* wait 1msec */
        !          1494: 
        !          1495:   return 0;
        !          1496: }
        !          1497: 
        !          1498: /*
        !          1499: ** Look for a particular board name in the on-board EEPROM.
        !          1500: */
        !          1501: static void EthwrkSignature(char *name, char *eeprom_image)
        !          1502: {
        !          1503:   u_long i,j,k;
        !          1504:   char *signatures[] = EWRK3_SIGNATURE;
        !          1505: 
        !          1506:   strcpy(name, "");
        !          1507:   for (i=0;*signatures[i] != '\0' && *name == '\0';i++) {
        !          1508:     for (j=EEPROM_PNAME7,k=0;j<=EEPROM_PNAME0 && k<strlen(signatures[i]);j++) {
        !          1509:       if (signatures[i][k] == eeprom_image[j]) {          /* track signature */
        !          1510:        k++;
        !          1511:       } else {                         /* lost signature; begin search again */
        !          1512:        k=0;
        !          1513:       }
        !          1514:     }
        !          1515:     if (k == strlen(signatures[i])) {
        !          1516:       for (k=0; k<EWRK3_STRLEN; k++) {
        !          1517:        name[k] = eeprom_image[EEPROM_PNAME7 + k];
        !          1518:        name[EWRK3_STRLEN] = '\0';
        !          1519:       }
        !          1520:     }
        !          1521:   }
        !          1522: 
        !          1523:   return;                                   /* return the device name string */
        !          1524: }
        !          1525: 
        !          1526: /*
        !          1527: ** Look for a special sequence in the Ethernet station address PROM that
        !          1528: ** is common across all EWRK3 products.
        !          1529: ** 
        !          1530: ** Search the Ethernet address ROM for the signature. Since the ROM address
        !          1531: ** counter can start at an arbitrary point, the search must include the entire
        !          1532: ** probe sequence length plus the (length_of_the_signature - 1).
        !          1533: ** Stop the search IMMEDIATELY after the signature is found so that the
        !          1534: ** PROM address counter is correctly positioned at the start of the
        !          1535: ** ethernet address for later read out.
        !          1536: */
        !          1537: 
        !          1538: static int DevicePresent(u_long iobase)
        !          1539: {
        !          1540:   union {
        !          1541:     struct {
        !          1542:       u32 a;
        !          1543:       u32 b;
        !          1544:     } llsig;
        !          1545:     char Sig[sizeof(u32) << 1];
        !          1546:   } dev;
        !          1547:   short sigLength;
        !          1548:   char data;
        !          1549:   int i, j, status = 0;
        !          1550: 
        !          1551:   dev.llsig.a = ETH_PROM_SIG;
        !          1552:   dev.llsig.b = ETH_PROM_SIG;
        !          1553:   sigLength = sizeof(u32) << 1;
        !          1554: 
        !          1555:   for (i=0,j=0;j<sigLength && i<PROBE_LENGTH+sigLength-1;i++) {
        !          1556:     data = inb(EWRK3_APROM);
        !          1557:     if (dev.Sig[j] == data) {   /* track signature */
        !          1558:       j++;
        !          1559:     } else {                    /* lost signature; begin search again */
        !          1560:       if (data == dev.Sig[0]) {
        !          1561:        j=1;
        !          1562:       } else {
        !          1563:        j=0;
        !          1564:       }
        !          1565:     }
        !          1566:   }
        !          1567: 
        !          1568:   if (j!=sigLength) {
        !          1569:     status = -ENODEV;           /* search failed */
        !          1570:   }
        !          1571: 
        !          1572:   return status;
        !          1573: }
        !          1574: 
        !          1575: static u_char get_hw_addr(struct device *dev, u_char *eeprom_image, char chipType)
        !          1576: {
        !          1577:   int i, j, k;
        !          1578:   u_short chksum;
        !          1579:   u_char crc, lfsr, sd, status = 0;
        !          1580:   u_long iobase = dev->base_addr;
        !          1581:   u16 tmp;
        !          1582: 
        !          1583:   if (chipType == LeMAC2) {
        !          1584:     for (crc=0x6a, j=0; j<ETH_ALEN; j++) {
        !          1585:       sd = dev->dev_addr[j] = eeprom_image[EEPROM_PADDR0 + j];
        !          1586:       outb(dev->dev_addr[j], EWRK3_PAR0 + j);
        !          1587:       for (k=0; k<8; k++, sd >>= 1) {
        !          1588:        lfsr = ((((crc & 0x02) >> 1) ^ (crc & 0x01)) ^ (sd & 0x01)) << 7;
        !          1589:        crc = (crc >> 1) + lfsr;
        !          1590:       }
        !          1591:     }
        !          1592:     if (crc != eeprom_image[EEPROM_PA_CRC]) status = -1;
        !          1593:   } else {
        !          1594:     for (i=0,k=0;i<ETH_ALEN;) {
        !          1595:       k <<= 1 ;
        !          1596:       if (k > 0xffff) k-=0xffff;
        !          1597: 
        !          1598:       k += (u_char) (tmp = inb(EWRK3_APROM));
        !          1599:       dev->dev_addr[i] = (u_char) tmp;
        !          1600:       outb(dev->dev_addr[i], EWRK3_PAR0 + i);
        !          1601:       i++;
        !          1602:       k += (u_short) ((tmp = inb(EWRK3_APROM)) << 8);
        !          1603:       dev->dev_addr[i] = (u_char) tmp;
        !          1604:       outb(dev->dev_addr[i], EWRK3_PAR0 + i);
        !          1605:       i++;
        !          1606: 
        !          1607:       if (k > 0xffff) k-=0xffff;
        !          1608:     }
        !          1609:     if (k == 0xffff) k=0;
        !          1610:     chksum = inb(EWRK3_APROM);
        !          1611:     chksum |= (inb(EWRK3_APROM)<<8);
        !          1612:     if (k != chksum) status = -1;
        !          1613:   }
        !          1614: 
        !          1615:   return status;
        !          1616: }
        !          1617: 
        !          1618: /*
        !          1619: ** Look for a particular board name in the EISA configuration space
        !          1620: */
        !          1621: static int EISA_signature(char *name, s32 eisa_id)
        !          1622: {
        !          1623:   u_long i;
        !          1624:   char *signatures[] = EWRK3_SIGNATURE;
        !          1625:   char ManCode[EWRK3_STRLEN];
        !          1626:   union {
        !          1627:     s32 ID;
        !          1628:     char Id[4];
        !          1629:   } Eisa;
        !          1630:   int status = 0;
        !          1631: 
        !          1632:   *name = '\0';
        !          1633:   for (i=0; i<4; i++) {
        !          1634:     Eisa.Id[i] = inb(eisa_id + i);
        !          1635:   }
        !          1636: 
        !          1637:   ManCode[0]=(((Eisa.Id[0]>>2)&0x1f)+0x40);
        !          1638:   ManCode[1]=(((Eisa.Id[1]&0xe0)>>5)+((Eisa.Id[0]&0x03)<<3)+0x40);
        !          1639:   ManCode[2]=(((Eisa.Id[2]>>4)&0x0f)+0x30);
        !          1640:   ManCode[3]=((Eisa.Id[2]&0x0f)+0x30);
        !          1641:   ManCode[4]=(((Eisa.Id[3]>>4)&0x0f)+0x30);
        !          1642:   ManCode[5]='\0';
        !          1643: 
        !          1644:   for (i=0;(*signatures[i] != '\0') && (*name == '\0');i++) {
        !          1645:     if (strstr(ManCode, signatures[i]) != NULL) {
        !          1646:       strcpy(name,ManCode);
        !          1647:       status = 1;
        !          1648:     }
        !          1649:   }
        !          1650: 
        !          1651:   return status;                           /* return the device name string */
        !          1652: }
        !          1653: 
        !          1654: /*
        !          1655: ** Perform IOCTL call functions here. Some are privileged operations and the
        !          1656: ** effective uid is checked in those cases.
        !          1657: */
        !          1658: static int ewrk3_ioctl(struct device *dev, struct ifreq *rq, int cmd)
        !          1659: {
        !          1660:   struct ewrk3_private *lp = (struct ewrk3_private *)dev->priv;
        !          1661:   struct ewrk3_ioctl *ioc = (struct ewrk3_ioctl *) &rq->ifr_data;
        !          1662:   u_long iobase = dev->base_addr;
        !          1663:   int i, j, status = 0;
        !          1664:   u_char csr;
        !          1665:   union {
        !          1666:     u_char addr[HASH_TABLE_LEN * ETH_ALEN];
        !          1667:     u_short val[(HASH_TABLE_LEN * ETH_ALEN) >> 1];
        !          1668:   } tmp;
        !          1669: 
        !          1670:   switch(ioc->cmd) {
        !          1671:   case EWRK3_GET_HWADDR:             /* Get the hardware address */
        !          1672:     for (i=0; i<ETH_ALEN; i++) {
        !          1673:       tmp.addr[i] = dev->dev_addr[i];
        !          1674:     }
        !          1675:     ioc->len = ETH_ALEN;
        !          1676:     if (!(status = verify_area(VERIFY_WRITE, (void *)ioc->data, ioc->len))) {
        !          1677:       memcpy_tofs(ioc->data, tmp.addr, ioc->len);
        !          1678:     }
        !          1679: 
        !          1680:     break;
        !          1681:   case EWRK3_SET_HWADDR:             /* Set the hardware address */
        !          1682:     if (suser()) {
        !          1683:       if (!(status = verify_area(VERIFY_READ, (void *)ioc->data, ETH_ALEN))) {
        !          1684:        csr = inb(EWRK3_CSR);
        !          1685:        csr |= (CSR_TXD|CSR_RXD);
        !          1686:        outb(csr, EWRK3_CSR);                  /* Disable the TX and RX */
        !          1687: 
        !          1688:        memcpy_fromfs(tmp.addr,ioc->data,ETH_ALEN);
        !          1689:        for (i=0; i<ETH_ALEN; i++) {
        !          1690:          dev->dev_addr[i] = tmp.addr[i];
        !          1691:          outb(tmp.addr[i], EWRK3_PAR0 + i);
        !          1692:        }
        !          1693: 
        !          1694:        csr &= ~(CSR_TXD|CSR_RXD);             /* Enable the TX and RX */
        !          1695:        outb(csr, EWRK3_CSR);
        !          1696:       }
        !          1697:     } else {
        !          1698:       status = -EPERM;
        !          1699:     }
        !          1700: 
        !          1701:     break;
        !          1702:   case EWRK3_SET_PROM:               /* Set Promiscuous Mode */
        !          1703:     if (suser()) {
        !          1704:       csr = inb(EWRK3_CSR);
        !          1705:       csr |= CSR_PME;
        !          1706:       csr &= ~CSR_MCE;
        !          1707:       outb(csr, EWRK3_CSR);
        !          1708:     } else {
        !          1709:       status = -EPERM;
        !          1710:     }
        !          1711: 
        !          1712:     break;
        !          1713:   case EWRK3_CLR_PROM:               /* Clear Promiscuous Mode */
        !          1714:     if (suser()) {
        !          1715:       csr = inb(EWRK3_CSR);
        !          1716:       csr &= ~CSR_PME;
        !          1717:       outb(csr, EWRK3_CSR);
        !          1718:     } else {
        !          1719:       status = -EPERM;
        !          1720:     }
        !          1721: 
        !          1722:     break;
        !          1723:   case EWRK3_SAY_BOO:                /* Say "Boo!" to the kernel log file */
        !          1724:     printk("%s: Boo!\n", dev->name);
        !          1725: 
        !          1726:     break;
        !          1727:   case EWRK3_GET_MCA:                /* Get the multicast address table */
        !          1728:     if (!(status = verify_area(VERIFY_WRITE, ioc->data, ioc->len))) {
        !          1729:       while (set_bit(0, (void *)&lp->lock) != 0); /* Wait for lock to free */
        !          1730:       if (lp->shmem_length == IO_ONLY) {
        !          1731:        outb(0, EWRK3_IOPR);
        !          1732:        outw(PAGE0_HTE, EWRK3_PIR1);
        !          1733:        for (i=0; i<(HASH_TABLE_LEN >> 3); i++) {
        !          1734:          tmp.addr[i] = inb(EWRK3_DATA);
        !          1735:        }
        !          1736:       } else {
        !          1737:        outb(0, EWRK3_MPR);
        !          1738:        memcpy_fromio(tmp.addr, (char *)(lp->shmem_base + PAGE0_HTE), (HASH_TABLE_LEN >> 3));
        !          1739:       }
        !          1740:       ioc->len = (HASH_TABLE_LEN >> 3);
        !          1741:       memcpy_tofs(ioc->data, tmp.addr, ioc->len); 
        !          1742:     }
        !          1743:     lp->lock = 0;                               /* Unlock the page register */
        !          1744: 
        !          1745:     break;
        !          1746:   case EWRK3_SET_MCA:                /* Set a multicast address */
        !          1747:     if (suser()) {
        !          1748:       if (!(status=verify_area(VERIFY_READ, ioc->data, ETH_ALEN*ioc->len))) {
        !          1749:        memcpy_fromfs(tmp.addr, ioc->data, ETH_ALEN * ioc->len);
        !          1750:        set_multicast_list(dev);
        !          1751:       }
        !          1752:     } else {
        !          1753:       status = -EPERM;
        !          1754:     }
        !          1755: 
        !          1756:     break;
        !          1757:   case EWRK3_CLR_MCA:                /* Clear all multicast addresses */
        !          1758:     if (suser()) {
        !          1759:       set_multicast_list(dev);
        !          1760:     } else {
        !          1761:       status = -EPERM;
        !          1762:     }
        !          1763: 
        !          1764:     break;
        !          1765:   case EWRK3_MCA_EN:                 /* Enable multicast addressing */
        !          1766:     if (suser()) {
        !          1767:       csr = inb(EWRK3_CSR);
        !          1768:       csr |= CSR_MCE;
        !          1769:       csr &= ~CSR_PME;
        !          1770:       outb(csr, EWRK3_CSR);
        !          1771:     } else {
        !          1772:       status = -EPERM;
        !          1773:     }
        !          1774: 
        !          1775:     break;
        !          1776:   case EWRK3_GET_STATS:              /* Get the driver statistics */
        !          1777:     cli();
        !          1778:     ioc->len = sizeof(lp->pktStats);
        !          1779:     if (!(status=verify_area(VERIFY_WRITE, ioc->data, ioc->len))) {
        !          1780:       memcpy_tofs(ioc->data, &lp->pktStats, ioc->len); 
        !          1781:     }
        !          1782:     sti();
        !          1783: 
        !          1784:     break;
        !          1785:   case EWRK3_CLR_STATS:              /* Zero out the driver statistics */
        !          1786:     if (suser()) {
        !          1787:       cli();
        !          1788:       memset(&lp->pktStats, 0, sizeof(lp->pktStats));
        !          1789:       sti();
        !          1790:     } else {
        !          1791:       status = -EPERM;
        !          1792:     }
        !          1793: 
        !          1794:     break;
        !          1795:   case EWRK3_GET_CSR:                /* Get the CSR Register contents */
        !          1796:     tmp.addr[0] = inb(EWRK3_CSR);
        !          1797:     ioc->len = 1;
        !          1798:     if (!(status=verify_area(VERIFY_WRITE, ioc->data, ioc->len))) {
        !          1799:       memcpy_tofs(ioc->data, tmp.addr, ioc->len);
        !          1800:     }
        !          1801: 
        !          1802:     break;
        !          1803:   case EWRK3_SET_CSR:                /* Set the CSR Register contents */
        !          1804:     if (suser()) {
        !          1805:       if (!(status=verify_area(VERIFY_READ, ioc->data, 1))) {
        !          1806:        memcpy_fromfs(tmp.addr, ioc->data, 1);
        !          1807:        outb(tmp.addr[0], EWRK3_CSR);
        !          1808:       }
        !          1809:     } else {
        !          1810:       status = -EPERM;
        !          1811:     }
        !          1812: 
        !          1813:     break;
        !          1814:   case EWRK3_GET_EEPROM:             /* Get the EEPROM contents */
        !          1815:     if (suser()) {
        !          1816:       for (i=0; i<(EEPROM_MAX>>1); i++) {
        !          1817:        tmp.val[i] = (short)Read_EEPROM(iobase, i);
        !          1818:       }
        !          1819:       i = EEPROM_MAX;
        !          1820:       tmp.addr[i++] = inb(EWRK3_CMR);            /* Config/Management Reg. */
        !          1821:       for (j=0;j<ETH_ALEN;j++) {
        !          1822:        tmp.addr[i++] = inb(EWRK3_PAR0 + j);
        !          1823:       }
        !          1824:       ioc->len = EEPROM_MAX + 1 + ETH_ALEN;
        !          1825:       if (!(status=verify_area(VERIFY_WRITE, ioc->data, ioc->len))) {
        !          1826:        memcpy_tofs(ioc->data, tmp.addr, ioc->len);
        !          1827:       }
        !          1828:     } else {
        !          1829:       status = -EPERM;
        !          1830:     }
        !          1831: 
        !          1832:     break;
        !          1833:   case EWRK3_SET_EEPROM:             /* Set the EEPROM contents */
        !          1834:     if (suser()) {
        !          1835:       if (!(status=verify_area(VERIFY_READ, ioc->data, EEPROM_MAX))) {
        !          1836:        memcpy_fromfs(tmp.addr, ioc->data, EEPROM_MAX);
        !          1837:        for (i=0; i<(EEPROM_MAX>>1); i++) {
        !          1838:          Write_EEPROM(tmp.val[i], iobase, i);
        !          1839:        }
        !          1840:       }
        !          1841:     } else {
        !          1842:       status = -EPERM;
        !          1843:     }
        !          1844: 
        !          1845:     break;
        !          1846:   case EWRK3_GET_CMR:                /* Get the CMR Register contents */
        !          1847:     tmp.addr[0] = inb(EWRK3_CMR);
        !          1848:     ioc->len = 1;
        !          1849:     if (!(status=verify_area(VERIFY_WRITE, ioc->data, ioc->len))) {
        !          1850:       memcpy_tofs(ioc->data, tmp.addr, ioc->len);
        !          1851:     }
        !          1852: 
        !          1853:     break;
        !          1854:   case EWRK3_SET_TX_CUT_THRU:        /* Set TX cut through mode */
        !          1855:     if (suser()) {
        !          1856:       lp->txc = 1;
        !          1857:     } else {
        !          1858:       status = -EPERM;
        !          1859:     }
        !          1860: 
        !          1861:     break;
        !          1862:   case EWRK3_CLR_TX_CUT_THRU:        /* Clear TX cut through mode */
        !          1863:     if (suser()) {
        !          1864:       lp->txc = 0;
        !          1865:     } else {
        !          1866:       status = -EPERM;
        !          1867:     }
        !          1868: 
        !          1869:     break;
        !          1870:   default:
        !          1871:     status = -EOPNOTSUPP;
        !          1872:   }
        !          1873: 
        !          1874:   return status;
        !          1875: }
        !          1876: 
        !          1877: #ifdef MODULE
        !          1878: static char devicename[9] = { 0, };
        !          1879: static struct device thisEthwrk = {
        !          1880:   devicename, /* device name is inserted by /linux/drivers/net/net_init.c */
        !          1881:   0, 0, 0, 0,
        !          1882:   0x300, 5,   /* I/O address, IRQ */
        !          1883:   0, 0, 0, NULL, ewrk3_probe };
        !          1884:        
        !          1885: static int io=0x300;   /* <--- EDIT THESE LINES FOR YOUR CONFIGURATION */
        !          1886: static int irq=5;      /* or use the insmod io= irq= options           */
        !          1887: 
        !          1888: int
        !          1889: init_module(void)
        !          1890: {
        !          1891:   thisEthwrk.base_addr=io;
        !          1892:   thisEthwrk.irq=irq;
        !          1893:   if (register_netdev(&thisEthwrk) != 0)
        !          1894:     return -EIO;
        !          1895:   return 0;
        !          1896: }
        !          1897: 
        !          1898: void
        !          1899: cleanup_module(void)
        !          1900: {
        !          1901:   if (thisEthwrk.priv) {
        !          1902:     kfree(thisEthwrk.priv);
        !          1903:     thisEthwrk.priv = NULL;
        !          1904:   }
        !          1905:   thisEthwrk.irq = 0;
        !          1906: 
        !          1907:   unregister_netdev(&thisEthwrk);
        !          1908:   release_region(thisEthwrk.base_addr, EWRK3_TOTAL_SIZE);
        !          1909: }
        !          1910: #endif /* MODULE */
        !          1911: 
        !          1912: 
        !          1913: /*
        !          1914:  * Local variables:
        !          1915:  *  compile-command: "gcc -D__KERNEL__ -I/linux/include -Wall -Wstrict-prototypes -fomit-frame-pointer -fno-strength-reduce -malign-loops=2 -malign-jumps=2 -malign-functions=2 -O2 -m486 -c ewrk3.c"
        !          1916:  *
        !          1917:  *  compile-command: "gcc -D__KERNEL__ -DMODULE -I/linux/include -Wall -Wstrict-prototypes -fomit-frame-pointer -fno-strength-reduce -malign-loops=2 -malign-jumps=2 -malign-functions=2 -O2 -m486 -c ewrk3.c"
        !          1918:  * End:
        !          1919:  */
        !          1920: 

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