i386/linux/linux-0.99/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 tupples.  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 "../block/blk.h"
 113 #include "scsi.h"
 114 #include "hosts.h"
 115 #include "t128.h"
 116 #define AUTOPROBE_IRQ
 117 #include "NCR5380.h"
 118 #include "constants.h"
 119
 120
 121
 122
 123 static struct override {
 124     unsigned char *address;
 125     int irq;
 126 } overrides
 127 #ifdef T128_OVERRIDE
 128     [] = T128_OVERRIDE;
 129 #else
 130     [4] = {{NULL,IRQ_AUTO}, {NULL,IRQ_AUTO}, {NULL,IRQ_AUTO},
 131         {NULL,IRQ_AUTO}};
 132 #endif
 133
 134 #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
 135
 136 static struct base {
 137     unsigned char *address;
 138     int noauto;
 139 } bases[] = {{(unsigned char *) 0xcc000, 0}, {(unsigned char *) 0xc8000, 0},
 140     {(unsigned char *) 0xdc000, 0}, {(unsigned char *) 0xd8000, 0}};
 141
 142 #define NO_BASES (sizeof (bases) / sizeof (struct base))
 143
 144 static const struct signature {
 145     const char *string;
 146     int offset;
 147 } signatures[] = {
 148 {"TSROM: SCSI BIOS, Version 1.12", 0x36},
 149 };
 150
 151 #define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))
 152
 153 /*
 154  * Function : t128_setup(char *str, int *ints)
 155  *
 156  * Purpose : LILO command line initialization of the overrides array,
 157  *
 158  * Inputs : str - unused, ints - array of integer paramters with ints[0]
 159  *      equal to the number of ints.
 160  *
 161  */
 162
 163 void t128_setup(char *str, int *ints) {
 164     static int commandline_current = 0;
 165     int i;
 166     if (ints[0] != 2)
 167         printk("t128_setup : usage t128=address,irq\n");
 168     else
 169         if (commandline_current < NO_OVERRIDES) {
 170             overrides[commandline_current].address = (unsigned char *) ints[1];
 171             overrides[commandline_current].irq = ints[2];
 172             for (i = 0; i < NO_BASES; ++i)
 173                 if (bases[i].address == (unsigned char *) ints[1]) {
 174                     bases[i].noauto = 1;
 175                     break;
 176                 }
 177             ++commandline_current;
 178         }
 179 }
 180
 181 static struct sigaction t128_sigaction =  { t128_intr, 0, SA_INTERRUPT , NULL };
 182
 183 /*
 184  * Function : int t128_detect(int hostno)
 185  *
 186  * Purpose : detects and initializes T128,T128F, or T228 controllers
 187  *      that were autoprobed, overriden on the LILO command line,
 188  *      or specified at compile time.
 189  *
 190  * Inputs : hostno - id of this SCSI adapter.
 191  *
 192  * Returns : 1 if a host adapter was found, 0 if not.
 193  *
 194  */
 195
 196 int t128_detect(int hostno) {
 197     static int current_override = 0, current_base = 0;
 198     struct Scsi_Host *instance;
 199     unsigned char *base;
 200     int sig, count;
 201
 202     for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 203         base = NULL;
 204
 205         if (overrides[current_override].address)
 206             base = overrides[current_override].address;
 207         else
 208             for (; !base && (current_base < NO_BASES); ++current_base) {
 209 #if (TDEBUG & TDEBUG_INIT)
 210     printk("scsi%d : probing address %08x\n", hostno, (unsigned int) bases[current_base].address);
 211 #endif
 212                 for (sig = 0; sig < NO_SIGNATURES; ++sig)
 213                     if (!bases[current_base].noauto && !memcmp
 214                         (bases[current_base].address + signatures[sig].offset,
 215                         signatures[sig].string, strlen(signatures[sig].string))) {
 216                         base = bases[current_base].address;
 217 #if (TDEBUG & TDEBUG_INIT)
 218                         printk("scsi%d : detected board.\n", hostno);
 219 #endif
 220                         break;
 221                     }
 222             }
 223
 224 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 225         printk("scsi%d : base = %08x\n", hostno, (unsigned int) base);
 226 #endif
 227
 228         if (!base)
 229             break;
 230
 231         instance = scsi_register (hostno, sizeof(struct NCR5380_hostdata));
 232         instance->base = base;
 233
 234         NCR5380_init(instance);
 235
 236         if (overrides[current_override].irq != IRQ_AUTO)
 237             instance->irq = overrides[current_override].irq;
 238         else
 239             instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
 240
 241         if (instance->irq != IRQ_NONE)
 242             if (irqaction (instance->irq, &t128_sigaction)) {
 243                 printk("scsi%d : IRQ%d not free, interrupts disabled\n",
 244                     hostno, instance->irq);
 245                 instance->irq = IRQ_NONE;
 246             }
 247
 248         if (instance->irq == IRQ_NONE) {
 249             printk("scsi%d : interrupts not enabled. for better interactive performance,\n", hostno);
 250             printk("scsi%d : please jumper the board for a free IRQ.\n", hostno);
 251         }
 252
 253 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 254         printk("scsi%d : irq = %d\n", hostno, instance->irq);
 255 #endif
 256
 257         printk("scsi%d : at 0x%08x", instance->host_no, (int)
 258             instance->base);
 259         if (instance->irq == IRQ_NONE)
 260             printk (" interrupts disabled");
 261         else
 262             printk (" irq %d", instance->irq);
 263         printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
 264             CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
 265         NCR5380_print_options(instance);
 266         printk("\n");
 267
 268         ++current_override;
 269         ++count;
 270         ++hostno;
 271     }
 272     return count;
 273 }
 274
 275 /*
 276  * Function : int t128_biosparam(int size, int dev, int *ip)
 277  *
 278  * Purpose : Generates a BIOS / DOS compatable H-C-S mapping for
 279  *      the specified device / size.
 280  *
 281  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 282  *      major / minor, ip[] = {heads, sectors, cylinders}
 283  *
 284  * Returns : allways 0 (success), initializes ip
 285  *
 286  */
 287
 288 /*
 289  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 290  * using hard disks on a trantor should verify that this mapping corresponds
 291  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 292  * and matching the H_C_S coordinates to what DOS uses.
 293  */
 294
 295 int t128_biosparam(int size, int dev, int * ip)
 296 {
 297   ip[0] = 64;
 298   ip[1] = 32;
 299   ip[2] = size >> 11;
 300   return 0;
 301 }
 302
 303 /*
 304  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 305  *      unsigned char *dst, int len)
 306  *
 307  * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
 308  *      dst
 309  *
 310  * Inputs : dst = destination, len = length in bytes
 311  *
 312  * Returns : 0 on success, non zero on a failure such as a watchdog
 313  *      timeout.
 314  */
 315
 316 static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
 317     int len) {
 318     register unsigned char *reg = (unsigned char *) (instance->base +
 319         T_DATA_REG_OFFSET), *d = dst;
 320     register i = len;
 321
 322     while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY);
 323
 324     for (; i; --i)
 325         *d++ = *reg;
 326
 327     if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 328         unsigned char tmp;
 329         volatile unsigned char *foo;
 330         foo = instance->base + T_CONTROL_REG_OFFSET;
 331         tmp = *foo;
 332         *foo = tmp | T_CR_CT;
 333         *foo = tmp;
 334         printk("scsi%d : watchdog timer fired in NCR5480_pread()\n",
 335             instance->host_no);
 336         return -1;
 337     } else
 338         return 0;
 339 }
 340
 341 /*
 342  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 343  *      unsigned char *src, int len)
 344  *
 345  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 346  *      src
 347  *
 348  * Inputs : src = source, len = length in bytes
 349  *
 350  * Returns : 0 on success, non zero on a failure such as a watchdog
 351  *      timeout.
 352  */
 353
 354 static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
 355     int len) {
 356     register unsigned char *reg = (unsigned char *) (instance->base +
 357         T_DATA_REG_OFFSET), *s = src;
 358     register i = len;
 359
 360     while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY);
 361     for (; i; --i)
 362         *reg = *s++;
 363
 364     if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 365         unsigned char tmp;
 366         volatile unsigned char *foo;
 367         foo = instance->base + T_CONTROL_REG_OFFSET;
 368         tmp = *foo;
 369         *foo = tmp | T_CR_CT;
 370         *foo = tmp;
 371         printk("scsi%d : watchdog timer fired in NCR5480_pwrite()\n",
 372             instance->host_no);
 373         return -1;
 374     } else
 375         return 0;
 376 }
 377
 378 /*
 379  * Function : const char *t128_info(void)
 380  *
 381  * Purpose : provide furthur information about this driver.
 382  *
 383  * Returns : an empty string.
 384  */
 385
 386 const char *t128_info (void) {
 387     static const char string[]="";
 388     return string;
 389 }
 390
 391 #include "NCR5380.c"