drivers/scsi/t128.c

   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 <asm/system.h>
 110 #include <linux/signal.h>
 111 #include <linux/sched.h>
 112 #include <asm/io.h>
 113 #include <linux/blk.h>
 114 #include "scsi.h"
 115 #include "hosts.h"
 116 #include "t128.h"
 117 #define AUTOPROBE_IRQ
 118 #include "NCR5380.h"
 119 #include "constants.h"
 120 #include "sd.h"
 121 #include <linux/stat.h>
 122 #include <linux/init.h>
 123
 124 struct proc_dir_entry proc_scsi_t128 = {
 125     PROC_SCSI_T128, 4, "t128",
 126     S_IFDIR | S_IRUGO | S_IXUGO, 2
 127 };
 128
 129
 130 static struct override {
 131     unsigned char *address;
 132     int irq;
 133 } overrides
 134 #ifdef T128_OVERRIDE
 135     [] __initdata = T128_OVERRIDE;
 136 #else
 137     [4] __initdata = {{NULL,IRQ_AUTO}, {NULL,IRQ_AUTO},
 138         {NULL,IRQ_AUTO}, {NULL,IRQ_AUTO}};
 139 #endif
 140
 141 #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
 142
 143 static struct base {
 144     unsigned int address;
 145     int noauto;
 146 } bases[] __initdata = {
 147     { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
 148 };
 149
 150 #define NO_BASES (sizeof (bases) / sizeof (struct base))
 151
 152 static const struct signature {
 153     const char *string;
 154     int offset;
 155 } signatures[] __initdata = {
 156 {"TSROM: SCSI BIOS, Version 1.12", 0x36},
 157 };
 158
 159 #define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))
 160
 161 /*
 162  * Function : t128_setup(char *str, int *ints)
 163  *
 164  * Purpose : LILO command line initialization of the overrides array,
 165  *
 166  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 167  *      equal to the number of ints.
 168  *
 169  */
 170
 171 void __init t128_setup(char *str, int *ints){
 172     static int commandline_current = 0;
 173     int i;
 174     if (ints[0] != 2)
 175         printk("t128_setup : usage t128=address,irq\n");
 176     else
 177         if (commandline_current < NO_OVERRIDES) {
 178             overrides[commandline_current].address = (unsigned char *) ints[1];
 179             overrides[commandline_current].irq = ints[2];
 180             for (i = 0; i < NO_BASES; ++i)
 181                 if (bases[i].address == ints[1]) {
 182                     bases[i].noauto = 1;
 183                     break;
 184                 }
 185             ++commandline_current;
 186         }
 187 }
 188
 189 /*
 190  * Function : int t128_detect(Scsi_Host_Template * tpnt)
 191  *
 192  * Purpose : detects and initializes T128,T128F, or T228 controllers
 193  *      that were autoprobed, overridden on the LILO command line,
 194  *      or specified at compile time.
 195  *
 196  * Inputs : tpnt - template for this SCSI adapter.
 197  *
 198  * Returns : 1 if a host adapter was found, 0 if not.
 199  *
 200  */
 201
 202 int __init t128_detect(Scsi_Host_Template * tpnt){
 203     static int current_override = 0, current_base = 0;
 204     struct Scsi_Host *instance;
 205     unsigned char *base;
 206     int sig, count;
 207
 208     tpnt->proc_dir = &proc_scsi_t128;
 209     tpnt->proc_info = &t128_proc_info;
 210
 211     for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 212         base = NULL;
 213
 214         if (overrides[current_override].address)
 215             base = overrides[current_override].address;
 216         else
 217             for (; !base && (current_base < NO_BASES); ++current_base) {
 218 #if (TDEBUG & TDEBUG_INIT)
 219     printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
 220 #endif
 221                 for (sig = 0; sig < NO_SIGNATURES; ++sig)
 222                     if (!bases[current_base].noauto &&
 223                         check_signature(bases[current_base].address +
 224                                         signatures[sig].offset,
 225                                         signatures[sig].string,
 226                                         strlen(signatures[sig].string))) {
 227                         base = (unsigned char *) bases[current_base].address;
 228 #if (TDEBUG & TDEBUG_INIT)
 229                         printk("scsi-t128 : detected board.\n");
 230 #endif
 231                         break;
 232                     }
 233             }
 234
 235 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 236         printk("scsi-t128 : base = %08x\n", (unsigned int) base);
 237 #endif
 238
 239         if (!base)
 240             break;
 241
 242         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 243         instance->base = phys_to_virt((unsigned int)base);
 244
 245         NCR5380_init(instance, 0);
 246
 247         if (overrides[current_override].irq != IRQ_AUTO)
 248             instance->irq = overrides[current_override].irq;
 249         else
 250             instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
 251
 252         if (instance->irq != IRQ_NONE)
 253             if (request_irq(instance->irq, do_t128_intr, SA_INTERRUPT, "t128", NULL)) {
 254                 printk("scsi%d : IRQ%d not free, interrupts disabled\n",
 255                     instance->host_no, instance->irq);
 256                 instance->irq = IRQ_NONE;
 257             }
 258
 259         if (instance->irq == IRQ_NONE) {
 260             printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 261             printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 262         }
 263
 264 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 265         printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 266 #endif
 267
 268         printk("scsi%d : at 0x%08x", instance->host_no, (int)
 269             instance->base);
 270         if (instance->irq == IRQ_NONE)
 271             printk (" interrupts disabled");
 272         else
 273             printk (" irq %d", instance->irq);
 274         printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
 275             CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
 276         NCR5380_print_options(instance);
 277         printk("\n");
 278
 279         ++current_override;
 280         ++count;
 281     }
 282     return count;
 283 }
 284
 285 /*
 286  * Function : int t128_biosparam(Disk * disk, kdev_t dev, int *ip)
 287  *
 288  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 289  *      the specified device / size.
 290  *
 291  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 292  *      major / minor, ip[] = {heads, sectors, cylinders}
 293  *
 294  * Returns : always 0 (success), initializes ip
 295  *
 296  */
 297
 298 /*
 299  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 300  * using hard disks on a trantor should verify that this mapping corresponds
 301  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 302  * and matching the H_C_S coordinates to what DOS uses.
 303  */
 304
 305 int t128_biosparam(Disk * disk, kdev_t dev, int * ip)
 306 {
 307   int size = disk->capacity;
 308   ip[0] = 64;
 309   ip[1] = 32;
 310   ip[2] = size >> 11;
 311   return 0;
 312 }
 313
 314 /*
 315  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 316  *      unsigned char *dst, int len)
 317  *
 318  * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
 319  *      dst
 320  *
 321  * Inputs : dst = destination, len = length in bytes
 322  *
 323  * Returns : 0 on success, non zero on a failure such as a watchdog
 324  *      timeout.
 325  */
 326
 327 static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
 328     int len) {
 329     register unsigned char *reg = (unsigned char *) (instance->base +
 330         T_DATA_REG_OFFSET), *d = dst;
 331     register int i = len;
 332
 333
 334 #if 0
 335     for (; i; --i) {
 336         while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 337 #else
 338     while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 339     for (; i; --i) {
 340 #endif
 341         *d++ = *reg;
 342     }
 343
 344     if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 345         unsigned char tmp;
 346         volatile unsigned char *foo;
 347         foo = instance->base + T_CONTROL_REG_OFFSET;
 348         tmp = *foo;
 349         *foo = tmp | T_CR_CT;
 350         *foo = tmp;
 351         printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
 352             instance->host_no);
 353         return -1;
 354     } else
 355         return 0;
 356 }
 357
 358 /*
 359  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 360  *      unsigned char *src, int len)
 361  *
 362  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 363  *      src
 364  *
 365  * Inputs : src = source, len = length in bytes
 366  *
 367  * Returns : 0 on success, non zero on a failure such as a watchdog
 368  *      timeout.
 369  */
 370
 371 static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
 372     int len) {
 373     register unsigned char *reg = (unsigned char *) (instance->base +
 374         T_DATA_REG_OFFSET), *s = src;
 375     register int i = len;
 376
 377 #if 0
 378     for (; i; --i) {
 379         while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 380 #else
 381     while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 382     for (; i; --i) {
 383 #endif
 384         *reg = *s++;
 385     }
 386
 387     if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 388         unsigned char tmp;
 389         volatile unsigned char *foo;
 390         foo = instance->base + T_CONTROL_REG_OFFSET;
 391         tmp = *foo;
 392         *foo = tmp | T_CR_CT;
 393         *foo = tmp;
 394         printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
 395             instance->host_no);
 396         return -1;
 397     } else
 398         return 0;
 399 }
 400
 401 #include "NCR5380.c"
 402
 403 #ifdef MODULE
 404 /* Eventually this will go into an include file, but this will be later */
 405 Scsi_Host_Template driver_template = TRANTOR_T128;
 406
 407 #include "scsi_module.c"
 408 #endif