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Annotation of Gnu-Mach/linux/src/drivers/scsi/dtc.c, revision 1.1

1.1     ! root        1: 
        !             2: #define AUTOSENSE
        !             3: #define PSEUDO_DMA
        !             4: #define DONT_USE_INTR
        !             5: #define UNSAFE         /* Leave interrupts enabled during pseudo-dma I/O */
        !             6: #define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
        !             7:                 NDEBUG_SELECTION+NDEBUG_ARBITRATION)
        !             8: #define DMA_WORKS_RIGHT
        !             9: 
        !            10: 
        !            11: /*
        !            12:  * DTC 3180/3280 driver, by
        !            13:  *     Ray Van Tassle  [email protected]
        !            14:  *
        !            15:  *     taken from ...
        !            16:  *     Trantor T128/T128F/T228 driver by...
        !            17:  *
        !            18:  *     Drew Eckhardt
        !            19:  *     Visionary Computing
        !            20:  *     (Unix and Linux consulting and custom programming)
        !            21:  *     [email protected]
        !            22:  *      +1 (303) 440-4894
        !            23:  *
        !            24:  * DISTRIBUTION RELEASE 1.
        !            25:  *
        !            26:  * For more information, please consult 
        !            27:  *
        !            28:  * NCR 5380 Family
        !            29:  * SCSI Protocol Controller
        !            30:  * Databook
        !            31: */
        !            32: 
        !            33: /*
        !            34:  * Options : 
        !            35:  * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
        !            36:  *      for commands that return with a CHECK CONDITION status. 
        !            37:  *
        !            38:  * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
        !            39:  * increase compared to polled I/O.
        !            40:  *
        !            41:  * PARITY - enable parity checking.  Not supported.
        !            42:  *
        !            43:  * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. 
        !            44:  *             You probably want this.
        !            45:  *
        !            46:  * The card is detected and initialized in one of several ways : 
        !            47:  * 1.  Autoprobe (default) - since the board is memory mapped, 
        !            48:  *     a BIOS signature is scanned for to locate the registers.
        !            49:  *     An interrupt is triggered to autoprobe for the interrupt
        !            50:  *     line.
        !            51:  *
        !            52:  * 2.  With command line overrides - dtc=address,irq may be 
        !            53:  *     used on the LILO command line to override the defaults.
        !            54:  * 
        !            55: */
        !            56: 
        !            57: /*----------------------------------------------------------------*/
        !            58: /* the following will set the monitor border color (useful to find
        !            59:  where something crashed or gets stuck at */
        !            60: /* 1 = blue
        !            61:  2 = green
        !            62:  3 = cyan
        !            63:  4 = red
        !            64:  5 = magenta
        !            65:  6 = yellow
        !            66:  7 = white
        !            67: */
        !            68: #if 0
        !            69: #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
        !            70: #else
        !            71: #define rtrc(i) {}
        !            72: #endif
        !            73: 
        !            74: 
        !            75: #include <asm/system.h>
        !            76: #include <linux/signal.h>
        !            77: #include <linux/sched.h>
        !            78: #include <linux/blk.h>
        !            79: #include <asm/io.h>
        !            80: #include "scsi.h"
        !            81: #include "hosts.h"
        !            82: #include "dtc.h"
        !            83: #define AUTOPROBE_IRQ
        !            84: #include "NCR5380.h"
        !            85: #include "constants.h"
        !            86: #include "sd.h"
        !            87: #include<linux/stat.h>
        !            88: #include<linux/string.h>
        !            89: 
        !            90: struct proc_dir_entry proc_scsi_dtc = {
        !            91:    PROC_SCSI_T128, 7, "dtc3x80",
        !            92:        S_IFDIR | S_IRUGO | S_IXUGO, 2
        !            93:      };
        !            94: 
        !            95: 
        !            96: static struct override {
        !            97:    __u32 address;
        !            98:    int irq;
        !            99: } overrides
        !           100: #ifdef OVERRIDE
        !           101: [] = OVERRIDE;
        !           102: #else
        !           103: [4] = {{0, IRQ_AUTO}, {0, IRQ_AUTO}, {0, IRQ_AUTO},
        !           104:        {0, IRQ_AUTO}};
        !           105: #endif
        !           106: 
        !           107: #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
        !           108: 
        !           109: static struct base {
        !           110:    __u32 address;
        !           111:    int noauto;
        !           112: } bases[] = {{0xcc000, 0}, {0xc8000, 0},
        !           113: {0xdc000, 0}, {0xd8000, 0}};
        !           114: 
        !           115: #define NO_BASES (sizeof (bases) / sizeof (struct base))
        !           116: 
        !           117: static const struct signature {
        !           118:    const char *string;
        !           119:    int offset;
        !           120: } signatures[] = { {"DATA TECHNOLOGY CORPORATION BIOS", 0x25}, };
        !           121: 
        !           122: #define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))
        !           123: 
        !           124: /*
        !           125:  * Function : dtc_setup(char *str, int *ints)
        !           126:  *
        !           127:  * Purpose : LILO command line initialization of the overrides array,
        !           128:  * 
        !           129:  * Inputs : str - unused, ints - array of integer parameters with ints[0]
        !           130:  *     equal to the number of ints.
        !           131:  *
        !           132: */
        !           133: 
        !           134: void dtc_setup(char *str, int *ints) {
        !           135:    static int commandline_current = 0;
        !           136:    int i;
        !           137:    if (ints[0] != 2)
        !           138:       printk("dtc_setup: usage dtc=address,irq\n");
        !           139:    else
        !           140:       if (commandline_current < NO_OVERRIDES) {
        !           141:       overrides[commandline_current].address = ints[1];
        !           142:       overrides[commandline_current].irq = ints[2];
        !           143:       for (i = 0; i < NO_BASES; ++i)
        !           144:         if (bases[i].address == ints[1]) {
        !           145:         bases[i].noauto = 1;
        !           146:         break;
        !           147:       }
        !           148:       ++commandline_current;
        !           149:    }
        !           150: }
        !           151: 
        !           152: /* 
        !           153:  * Function : int dtc_detect(Scsi_Host_Template * tpnt)
        !           154:  *
        !           155:  * Purpose : detects and initializes DTC 3180/3280 controllers
        !           156:  *     that were autoprobed, overridden on the LILO command line, 
        !           157:  *     or specified at compile time.
        !           158:  *
        !           159:  * Inputs : tpnt - template for this SCSI adapter.
        !           160:  * 
        !           161:  * Returns : 1 if a host adapter was found, 0 if not.
        !           162:  *
        !           163: */
        !           164: 
        !           165: 
        !           166: int dtc_detect(Scsi_Host_Template * tpnt) {
        !           167:    static int current_override = 0, current_base = 0;
        !           168:    struct Scsi_Host *instance;
        !           169:    unsigned char *base;
        !           170:    int sig, count;
        !           171: 
        !           172:    tpnt->proc_dir = &proc_scsi_dtc;
        !           173:    tpnt->proc_info = &dtc_proc_info;
        !           174: 
        !           175:    for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
        !           176:       base = NULL;
        !           177: 
        !           178:       if (overrides[current_override].address)
        !           179:         base = (unsigned char *)overrides[current_override].address;
        !           180:       else
        !           181:         for (; !base && (current_base < NO_BASES); ++current_base) {
        !           182: #if (DTCDEBUG & DTCDEBUG_INIT)
        !           183:         printk("scsi : probing address %08x\n", (unsigned int) bases[current_base].address);
        !           184: #endif
        !           185:         for (sig = 0; sig < NO_SIGNATURES; ++sig)
        !           186:            if (!bases[current_base].noauto && !memcmp
        !           187:              ((unsigned char *)(bases[current_base].address + signatures[sig].offset),
        !           188:              signatures[sig].string, strlen(signatures[sig].string))) {
        !           189:            base = (unsigned char *)bases[current_base].address;
        !           190: #if (DTCDEBUG & DTCDEBUG_INIT)
        !           191:            printk("scsi-dtc : detected board.\n");
        !           192: #endif
        !           193:            break;
        !           194:         }
        !           195:       }
        !           196: 
        !           197: #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
        !           198:       printk("scsi-dtc : base = %08x\n", (unsigned int) base);
        !           199: #endif
        !           200: 
        !           201:       if (!base)
        !           202:         break;
        !           203: 
        !           204:       instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
        !           205:       instance->base = base;
        !           206: 
        !           207:       NCR5380_init(instance, 0);
        !           208: 
        !           209:       NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR); /* Enable int's */
        !           210:       if (overrides[current_override].irq != IRQ_AUTO)
        !           211:         instance->irq = overrides[current_override].irq;
        !           212:       else
        !           213:         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
        !           214: 
        !           215: #ifndef DONT_USE_INTR
        !           216: /* With interrupts enabled, it will sometimes hang when doing heavy
        !           217:  * reads. So better not enable them until I finger it out. */
        !           218:       if (instance->irq != IRQ_NONE)
        !           219:         if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc")) {
        !           220:         printk("scsi%d : IRQ%d not free, interrupts disabled\n",
        !           221:              instance->host_no, instance->irq);
        !           222:         instance->irq = IRQ_NONE;
        !           223:       }
        !           224: 
        !           225:       if (instance->irq == IRQ_NONE) {
        !           226:         printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
        !           227:         printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
        !           228:       }
        !           229: #else
        !           230:       if (instance->irq != IRQ_NONE)
        !           231:         printk("scsi%d : interrupts not used. Might as well not jumper it.\n",
        !           232:                instance->host_no);
        !           233:       instance->irq = IRQ_NONE;
        !           234: #endif
        !           235: #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
        !           236:       printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
        !           237: #endif
        !           238: 
        !           239:       printk("scsi%d : at 0x%05X", instance->host_no, (int)instance->base);
        !           240:       if (instance->irq == IRQ_NONE)
        !           241:         printk (" interrupts disabled");
        !           242:       else
        !           243:         printk (" irq %d", instance->irq);
        !           244:       printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
        !           245:           CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
        !           246:       NCR5380_print_options(instance);
        !           247:       printk("\n");
        !           248: 
        !           249:       ++current_override;
        !           250:       ++count;
        !           251:    }
        !           252:    return count;
        !           253: }
        !           254: 
        !           255: /*
        !           256:  * Function : int dtc_biosparam(Disk * disk, kdev_t dev, int *ip)
        !           257:  *
        !           258:  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for 
        !           259:  *     the specified device / size.
        !           260:  * 
        !           261:  * Inputs : size = size of device in sectors (512 bytes), dev = block device
        !           262:  *     major / minor, ip[] = {heads, sectors, cylinders}  
        !           263:  *
        !           264:  * Returns : always 0 (success), initializes ip
        !           265:  *     
        !           266: */
        !           267: 
        !           268: /* 
        !           269:  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
        !           270:  * using hard disks on a trantor should verify that this mapping corresponds
        !           271:  * to that used by the BIOS / ASPI driver by running the linux fdisk program
        !           272:  * and matching the H_C_S coordinates to what DOS uses.
        !           273: */
        !           274: 
        !           275: int dtc_biosparam(Disk * disk, kdev_t dev, int * ip)
        !           276: {
        !           277:    int size = disk->capacity;
        !           278: 
        !           279:    ip[0] = 64;
        !           280:    ip[1] = 32;
        !           281:    ip[2] = size >> 11;
        !           282:    return 0;
        !           283: }
        !           284: 
        !           285: /****************************************************************
        !           286:  * Function : int NCR5380_pread (struct Scsi_Host *instance, 
        !           287:  *     unsigned char *dst, int len)
        !           288:  *
        !           289:  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to 
        !           290:  *     dst
        !           291:  * 
        !           292:  * Inputs : dst = destination, len = length in bytes
        !           293:  *
        !           294:  * Returns : 0 on success, non zero on a failure such as a watchdog 
        !           295:  *     timeout.
        !           296: */
        !           297: 
        !           298: static int dtc_maxi = 0;
        !           299: static int dtc_wmaxi = 0;
        !           300: 
        !           301: static inline int NCR5380_pread (struct Scsi_Host *instance,
        !           302:      unsigned char *dst, int len)
        !           303:      {
        !           304:    unsigned char *d = dst;
        !           305:    int i;      /* For counting time spent in the poll-loop */
        !           306:    NCR5380_local_declare();
        !           307:    NCR5380_setup(instance);
        !           308: 
        !           309:    i = 0;
        !           310:    NCR5380_read(RESET_PARITY_INTERRUPT_REG);
        !           311:    NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
        !           312:    if (instance->irq == IRQ_NONE)
        !           313:       NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
        !           314:    else
        !           315:       NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
        !           316:    NCR5380_write(DTC_BLK_CNT, len >> 7);        /* Block count */
        !           317:    rtrc(1);
        !           318:    while (len > 0) {
        !           319:       rtrc(2);
        !           320:       while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
        !           321:         ++i;
        !           322:       rtrc(3);
        !           323:       memcpy(d, (char *)(base + DTC_DATA_BUF), 128);
        !           324:       d += 128;
        !           325:       len -= 128;
        !           326:       rtrc(7); /*** with int's on, it sometimes hangs after here.
        !           327:                 * Looks like something makes HBNR go away. */
        !           328:    }
        !           329:    rtrc(4);
        !           330:    while ( !(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
        !           331:       ++i;
        !           332:    NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
        !           333:    rtrc(0);
        !           334:    NCR5380_read(RESET_PARITY_INTERRUPT_REG);
        !           335:    if (i > dtc_maxi)
        !           336:       dtc_maxi = i;
        !           337:    return(0);
        !           338: }
        !           339: 
        !           340: /****************************************************************
        !           341:  * Function : int NCR5380_pwrite (struct Scsi_Host *instance, 
        !           342:  *     unsigned char *src, int len)
        !           343:  *
        !           344:  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
        !           345:  *     src
        !           346:  * 
        !           347:  * Inputs : src = source, len = length in bytes
        !           348:  *
        !           349:  * Returns : 0 on success, non zero on a failure such as a watchdog 
        !           350:  *     timeout.
        !           351: */
        !           352: 
        !           353: static inline int NCR5380_pwrite (struct Scsi_Host *instance,
        !           354:      unsigned char *src, int len) {
        !           355:    int i;
        !           356:    NCR5380_local_declare();
        !           357:    NCR5380_setup(instance);
        !           358: 
        !           359:    NCR5380_read(RESET_PARITY_INTERRUPT_REG);
        !           360:    NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
        !           361:    /* set direction (write) */
        !           362:    if (instance->irq == IRQ_NONE)
        !           363:       NCR5380_write(DTC_CONTROL_REG, 0);
        !           364:    else
        !           365:       NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
        !           366:    NCR5380_write(DTC_BLK_CNT, len >> 7);        /* Block count */
        !           367:    for (i = 0; len > 0; ++i) {
        !           368:       rtrc(5);
        !           369:       /* Poll until the host buffer can accept data. */
        !           370:       while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
        !           371:         ++i;
        !           372:       rtrc(3);
        !           373:       memcpy((char *)(base + DTC_DATA_BUF), src, 128);
        !           374:       src += 128;
        !           375:       len -= 128;
        !           376:    }
        !           377:    rtrc(4);
        !           378:    while ( !(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
        !           379:       ++i;
        !           380:    rtrc(6);
        !           381:    /* Wait until the last byte has been sent to the disk */
        !           382:    while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
        !           383:       ++i;
        !           384:    rtrc(7);
        !           385:    /* Check for parity error here. fixme. */
        !           386:    NCR5380_write(MODE_REG, 0); /* Clear the operating mode */
        !           387:    rtrc(0);
        !           388:    if (i > dtc_wmaxi)
        !           389:       dtc_wmaxi = i;
        !           390:    return (0);
        !           391: }
        !           392: 
        !           393: #include "NCR5380.c"
        !           394: 
        !           395: #ifdef MODULE
        !           396: /* Eventually this will go into an include file, but this will be later */
        !           397: Scsi_Host_Template driver_template = DTC3x80;
        !           398: 
        !           399: #include "scsi_module.c"
        !           400: #endif

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