linux/drivers/scsi/t128.c
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   1#define AUTOSENSE
   2#define PSEUDO_DMA
   3
   4/*
   5 * Trantor T128/T128F/T228 driver
   6 *      Note : architecturally, the T100 and T130 are different and won't 
   7 *      work
   8 *
   9 * Copyright 1993, Drew Eckhardt
  10 *      Visionary Computing
  11 *      (Unix and Linux consulting and custom programming)
  12 *      drew@colorado.edu
  13 *      +1 (303) 440-4894
  14 *
  15 * DISTRIBUTION RELEASE 3.
  16 *
  17 * For more information, please consult 
  18 *
  19 * Trantor Systems, Ltd.
  20 * T128/T128F/T228 SCSI Host Adapter
  21 * Hardware Specifications
  22 * 
  23 * Trantor Systems, Ltd. 
  24 * 5415 Randall Place
  25 * Fremont, CA 94538
  26 * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
  27 * 
  28 * and 
  29 *
  30 * NCR 5380 Family
  31 * SCSI Protocol Controller
  32 * Databook
  33 *
  34 * NCR Microelectronics
  35 * 1635 Aeroplaza Drive
  36 * Colorado Springs, CO 80916
  37 * 1+ (719) 578-3400
  38 * 1+ (800) 334-5454
  39 */
  40
  41/*
  42 * Options : 
  43 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
  44 *      for commands that return with a CHECK CONDITION status. 
  45 *
  46 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
  47 * increase compared to polled I/O.
  48 *
  49 * PARITY - enable parity checking.  Not supported.
  50 * 
  51 * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
  52 *
  53 *
  54 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.  You
  55 *          only really want to use this if you're having a problem with
  56 *          dropped characters during high speed communications, and even
  57 *          then, you're going to be better off twiddling with transfersize.
  58 *
  59 * USLEEP - enable support for devices that don't disconnect.  Untested.
  60 *
  61 * The card is detected and initialized in one of several ways : 
  62 * 1.  Autoprobe (default) - since the board is memory mapped, 
  63 *     a BIOS signature is scanned for to locate the registers.
  64 *     An interrupt is triggered to autoprobe for the interrupt
  65 *     line.
  66 *
  67 * 2.  With command line overrides - t128=address,irq may be 
  68 *     used on the LILO command line to override the defaults.
  69 *
  70 * 3.  With the T128_OVERRIDE compile time define.  This is 
  71 *     specified as an array of address, irq tuples.  Ie, for
  72 *     one board at the default 0xcc000 address, IRQ5, I could say 
  73 *     -DT128_OVERRIDE={{0xcc000, 5}}
  74 *      
  75 *     Note that if the override methods are used, place holders must
  76 *     be specified for other boards in the system.
  77 * 
  78 * T128/T128F jumper/dipswitch settings (note : on my sample, the switches 
  79 * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
  80 *
  81 * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot 
  82 * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
  83 * cc000   off off      
  84 * c8000   off on
  85 * dc000   on  off
  86 * d8000   on  on
  87 *
  88 * 
  89 * Interrupts 
  90 * There is a 12 pin jumper block, jp1, numbered as follows : 
  91 *   T128 (JP1)          T128F (J5)
  92 * 2 4 6 8 10 12        11 9  7 5 3 1
  93 * 1 3 5 7 9  11        12 10 8 6 4 2
  94 *
  95 * 3   2-4
  96 * 5   1-3
  97 * 7   3-5
  98 * T128F only 
  99 * 10 8-10
 100 * 12 7-9
 101 * 14 10-12
 102 * 15 9-11
 103 */
 104 
 105/*
 106 * $Log: t128.c,v $
 107 */
 108
 109#include <linux/signal.h>
 110#include <linux/io.h>
 111#include <linux/blkdev.h>
 112#include <linux/interrupt.h>
 113#include <linux/stat.h>
 114#include <linux/init.h>
 115#include <linux/module.h>
 116#include <linux/delay.h>
 117
 118#include "scsi.h"
 119#include <scsi/scsi_host.h>
 120#include "t128.h"
 121#define AUTOPROBE_IRQ
 122#include "NCR5380.h"
 123
 124static struct override {
 125    unsigned long address;
 126    int irq;
 127} overrides
 128#ifdef T128_OVERRIDE
 129    [] __initdata = T128_OVERRIDE;
 130#else
 131    [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
 132        {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
 133#endif
 134
 135#define NO_OVERRIDES ARRAY_SIZE(overrides)
 136
 137static struct base {
 138    unsigned int address;
 139    int noauto;
 140} bases[] __initdata = {
 141    { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
 142};
 143
 144#define NO_BASES ARRAY_SIZE(bases)
 145
 146static struct signature {
 147    const char *string;
 148    int offset;
 149} signatures[] __initdata = {
 150{"TSROM: SCSI BIOS, Version 1.12", 0x36},
 151};
 152
 153#define NO_SIGNATURES ARRAY_SIZE(signatures)
 154
 155/*
 156 * Function : t128_setup(char *str, int *ints)
 157 *
 158 * Purpose : LILO command line initialization of the overrides array,
 159 * 
 160 * Inputs : str - unused, ints - array of integer parameters with ints[0]
 161 *      equal to the number of ints.
 162 *
 163 */
 164
 165void __init t128_setup(char *str, int *ints){
 166    static int commandline_current = 0;
 167    int i;
 168    if (ints[0] != 2) 
 169        printk("t128_setup : usage t128=address,irq\n");
 170    else 
 171        if (commandline_current < NO_OVERRIDES) {
 172            overrides[commandline_current].address = ints[1];
 173            overrides[commandline_current].irq = ints[2];
 174            for (i = 0; i < NO_BASES; ++i)
 175                if (bases[i].address == ints[1]) {
 176                    bases[i].noauto = 1;
 177                    break;
 178                }
 179            ++commandline_current;
 180        }
 181}
 182
 183/* 
 184 * Function : int t128_detect(struct scsi_host_template * tpnt)
 185 *
 186 * Purpose : detects and initializes T128,T128F, or T228 controllers
 187 *      that were autoprobed, overridden on the LILO command line, 
 188 *      or specified at compile time.
 189 *
 190 * Inputs : tpnt - template for this SCSI adapter.
 191 * 
 192 * Returns : 1 if a host adapter was found, 0 if not.
 193 *
 194 */
 195
 196int __init t128_detect(struct scsi_host_template * tpnt){
 197    static int current_override = 0, current_base = 0;
 198    struct Scsi_Host *instance;
 199    unsigned long base;
 200    void __iomem *p;
 201    int sig, count;
 202
 203    tpnt->proc_name = "t128";
 204    tpnt->proc_info = &t128_proc_info;
 205
 206    for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 207        base = 0;
 208        p = NULL;
 209
 210        if (overrides[current_override].address) {
 211            base = overrides[current_override].address;
 212            p = ioremap(bases[current_base].address, 0x2000);
 213            if (!p)
 214                base = 0;
 215        } else 
 216            for (; !base && (current_base < NO_BASES); ++current_base) {
 217#if (TDEBUG & TDEBUG_INIT)
 218    printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
 219#endif
 220                if (bases[current_base].noauto)
 221                        continue;
 222                p = ioremap(bases[current_base].address, 0x2000);
 223                if (!p)
 224                        continue;
 225                for (sig = 0; sig < NO_SIGNATURES; ++sig) 
 226                    if (check_signature(p + signatures[sig].offset,
 227                                        signatures[sig].string,
 228                                        strlen(signatures[sig].string))) {
 229                        base = bases[current_base].address;
 230#if (TDEBUG & TDEBUG_INIT)
 231                        printk("scsi-t128 : detected board.\n");
 232#endif
 233                        goto found;
 234                    }
 235                iounmap(p);
 236            }
 237
 238#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 239        printk("scsi-t128 : base = %08x\n", (unsigned int) base);
 240#endif
 241
 242        if (!base)
 243            break;
 244
 245found:
 246        instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 247        if(instance == NULL)
 248                break;
 249                
 250        instance->base = base;
 251        ((struct NCR5380_hostdata *)instance->hostdata)->base = p;
 252
 253        NCR5380_init(instance, 0);
 254
 255        if (overrides[current_override].irq != IRQ_AUTO)
 256            instance->irq = overrides[current_override].irq;
 257        else 
 258            instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
 259
 260        if (instance->irq != SCSI_IRQ_NONE) 
 261            if (request_irq(instance->irq, t128_intr, IRQF_DISABLED, "t128",
 262                            instance)) {
 263                printk("scsi%d : IRQ%d not free, interrupts disabled\n", 
 264                    instance->host_no, instance->irq);
 265                instance->irq = SCSI_IRQ_NONE;
 266            } 
 267
 268        if (instance->irq == SCSI_IRQ_NONE) {
 269            printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 270            printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 271        }
 272
 273#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 274        printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 275#endif
 276
 277        printk("scsi%d : at 0x%08lx", instance->host_no, instance->base);
 278        if (instance->irq == SCSI_IRQ_NONE)
 279            printk (" interrupts disabled");
 280        else 
 281            printk (" irq %d", instance->irq);
 282        printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
 283            CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
 284        NCR5380_print_options(instance);
 285        printk("\n");
 286
 287        ++current_override;
 288        ++count;
 289    }
 290    return count;
 291}
 292
 293static int t128_release(struct Scsi_Host *shost)
 294{
 295        NCR5380_local_declare();
 296        NCR5380_setup(shost);
 297        if (shost->irq)
 298                free_irq(shost->irq, shost);
 299        NCR5380_exit(shost);
 300        if (shost->io_port && shost->n_io_port)
 301                release_region(shost->io_port, shost->n_io_port);
 302        scsi_unregister(shost);
 303        iounmap(base);
 304        return 0;
 305}
 306
 307/*
 308 * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
 309 *
 310 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for 
 311 *      the specified device / size.
 312 * 
 313 * Inputs : size = size of device in sectors (512 bytes), dev = block device
 314 *      major / minor, ip[] = {heads, sectors, cylinders}  
 315 *
 316 * Returns : always 0 (success), initializes ip
 317 *      
 318 */
 319
 320/* 
 321 * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 322 * using hard disks on a trantor should verify that this mapping corresponds
 323 * to that used by the BIOS / ASPI driver by running the linux fdisk program
 324 * and matching the H_C_S coordinates to what DOS uses.
 325 */
 326
 327int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 328                sector_t capacity, int * ip)
 329{
 330  ip[0] = 64;
 331  ip[1] = 32;
 332  ip[2] = capacity >> 11;
 333  return 0;
 334}
 335
 336/*
 337 * Function : int NCR5380_pread (struct Scsi_Host *instance, 
 338 *      unsigned char *dst, int len)
 339 *
 340 * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to 
 341 *      dst
 342 * 
 343 * Inputs : dst = destination, len = length in bytes
 344 *
 345 * Returns : 0 on success, non zero on a failure such as a watchdog 
 346 *      timeout.
 347 */
 348
 349static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
 350    int len) {
 351    NCR5380_local_declare();
 352    void __iomem *reg;
 353    unsigned char *d = dst;
 354    register int i = len;
 355
 356    NCR5380_setup(instance);
 357    reg = base + T_DATA_REG_OFFSET;
 358
 359#if 0
 360    for (; i; --i) {
 361        while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 362#else
 363    while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 364    for (; i; --i) {
 365#endif
 366        *d++ = readb(reg);
 367    }
 368
 369    if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 370        unsigned char tmp;
 371        void __iomem *foo = base + T_CONTROL_REG_OFFSET;
 372        tmp = readb(foo);
 373        writeb(tmp | T_CR_CT, foo);
 374        writeb(tmp, foo);
 375        printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
 376            instance->host_no);
 377        return -1;
 378    } else
 379        return 0;
 380}
 381
 382/*
 383 * Function : int NCR5380_pwrite (struct Scsi_Host *instance, 
 384 *      unsigned char *src, int len)
 385 *
 386 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 387 *      src
 388 * 
 389 * Inputs : src = source, len = length in bytes
 390 *
 391 * Returns : 0 on success, non zero on a failure such as a watchdog 
 392 *      timeout.
 393 */
 394
 395static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
 396    int len) {
 397    NCR5380_local_declare();
 398    void __iomem *reg;
 399    unsigned char *s = src;
 400    register int i = len;
 401
 402    NCR5380_setup(instance);
 403    reg = base + T_DATA_REG_OFFSET;
 404
 405#if 0
 406    for (; i; --i) {
 407        while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 408#else
 409    while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 410    for (; i; --i) {
 411#endif
 412        writeb(*s++, reg);
 413    }
 414
 415    if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 416        unsigned char tmp;
 417        void __iomem *foo = base + T_CONTROL_REG_OFFSET;
 418        tmp = readb(foo);
 419        writeb(tmp | T_CR_CT, foo);
 420        writeb(tmp, foo);
 421        printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
 422            instance->host_no);
 423        return -1;
 424    } else 
 425        return 0;
 426}
 427
 428MODULE_LICENSE("GPL");
 429
 430#include "NCR5380.c"
 431
 432static struct scsi_host_template driver_template = {
 433        .name           = "Trantor T128/T128F/T228",
 434        .detect         = t128_detect,
 435        .release        = t128_release,
 436        .queuecommand   = t128_queue_command,
 437        .eh_abort_handler = t128_abort,
 438        .eh_bus_reset_handler    = t128_bus_reset,
 439        .bios_param     = t128_biosparam,
 440        .can_queue      = CAN_QUEUE,
 441        .this_id        = 7,
 442        .sg_tablesize   = SG_ALL,
 443        .cmd_per_lun    = CMD_PER_LUN,
 444        .use_clustering = DISABLE_CLUSTERING,
 445};
 446#include "scsi_module.c"
 447
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