drivers/scsi/t128.c

/* */
This source file includes following definitions.
t128_detect
t128_biosparam
NCR5380_pread
NCR5380_pwrite
   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 "../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 #include "sd.h"
 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 parameters 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 /* 
 182  * Function : int t128_detect(Scsi_Host_Template * tpnt)
 183  *
 184  * Purpose : detects and initializes T128,T128F, or T228 controllers
 185  *      that were autoprobed, overridden on the LILO command line, 
 186  *      or specified at compile time.
 187  *
 188  * Inputs : tpnt - template for this SCSI adapter.
 189  * 
 190  * Returns : 1 if a host adapter was found, 0 if not.
 191  *
 192  */
 193 
 194 int t128_detect(Scsi_Host_Template * tpnt) {
     /*  */
 195     static int current_override = 0, current_base = 0;
 196     struct Scsi_Host *instance;
 197     unsigned char *base;
 198     int sig, count;
 199 
 200     for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 201         base = NULL;
 202 
 203         if (overrides[current_override].address)
 204             base = overrides[current_override].address;
 205         else 
 206             for (; !base && (current_base < NO_BASES); ++current_base) {
 207 #if (TDEBUG & TDEBUG_INIT)
 208     printk("scsi : probing address %08x\n", (unsigned int) bases[current_base].address);
 209 #endif
 210                 for (sig = 0; sig < NO_SIGNATURES; ++sig) 
 211                     if (!bases[current_base].noauto && !memcmp 
 212                         (bases[current_base].address + signatures[sig].offset, 
 213                         signatures[sig].string, strlen(signatures[sig].string))) {
 214                         base = bases[current_base].address;
 215 #if (TDEBUG & TDEBUG_INIT)
 216                         printk("scsi-t128 : detected board.\n");
 217 #endif
 218                         break;
 219                     }
 220             }
 221 
 222 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 223         printk("scsi-t128 : base = %08x\n", (unsigned int) base);
 224 #endif
 225 
 226         if (!base)
 227             break;
 228 
 229         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 230         instance->base = base;
 231 
 232         NCR5380_init(instance, 0);
 233 
 234         if (overrides[current_override].irq != IRQ_AUTO)
 235             instance->irq = overrides[current_override].irq;
 236         else 
 237             instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
 238 
 239         if (instance->irq != IRQ_NONE) 
 240             if (request_irq(instance->irq, t128_intr, SA_INTERRUPT, "t128")) {
 241                 printk("scsi%d : IRQ%d not free, interrupts disabled\n", 
 242                     instance->host_no, instance->irq);
 243                 instance->irq = IRQ_NONE;
 244             } 
 245 
 246         if (instance->irq == IRQ_NONE) {
 247             printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 248             printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 249         }
 250 
 251 #if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
 252         printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 253 #endif
 254 
 255         printk("scsi%d : at 0x%08x", instance->host_no, (int) 
 256             instance->base);
 257         if (instance->irq == IRQ_NONE)
 258             printk (" interrupts disabled");
 259         else 
 260             printk (" irq %d", instance->irq);
 261         printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
 262             CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
 263         NCR5380_print_options(instance);
 264         printk("\n");
 265 
 266         ++current_override;
 267         ++count;
 268     }
 269     return count;
 270 }
 271 
 272 /*
 273  * Function : int t128_biosparam(Disk * disk, int dev, int *ip)
 274  *
 275  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for 
 276  *      the specified device / size.
 277  * 
 278  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 279  *      major / minor, ip[] = {heads, sectors, cylinders}  
 280  *
 281  * Returns : always 0 (success), initializes ip
 282  *      
 283  */
 284 
 285 /* 
 286  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 287  * using hard disks on a trantor should verify that this mapping corresponds
 288  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 289  * and matching the H_C_S coordinates to what DOS uses.
 290  */
 291 
 292 int t128_biosparam(Disk * disk, int dev, int * ip)
     /*  */
 293 {
 294   int size = disk->capacity;
 295   ip[0] = 64;
 296   ip[1] = 32;
 297   ip[2] = size >> 11;
 298   return 0;
 299 }
 300 
 301 /*
 302  * Function : int NCR5380_pread (struct Scsi_Host *instance, 
 303  *      unsigned char *dst, int len)
 304  *
 305  * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to 
 306  *      dst
 307  * 
 308  * Inputs : dst = destination, len = length in bytes
 309  *
 310  * Returns : 0 on success, non zero on a failure such as a watchdog 
 311  *      timeout.
 312  */
 313 
 314 static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
     /*  */
 315     int len) {
 316     register unsigned char *reg = (unsigned char *) (instance->base + 
 317         T_DATA_REG_OFFSET), *d = dst;
 318     register i = len;
 319 
 320 
 321 #if 0
 322     for (; i; --i) {
 323         while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 324 #else
 325     while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 326     for (; i; --i) {
 327 #endif
 328         *d++ = *reg;
 329     }
 330 
 331     if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 332         unsigned char tmp;
 333         volatile unsigned char *foo;
 334         foo = instance->base + T_CONTROL_REG_OFFSET;
 335         tmp = *foo;
 336         *foo = tmp | T_CR_CT;
 337         *foo = tmp;
 338         printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
 339             instance->host_no);
 340         return -1;
 341     } else
 342         return 0;
 343 }
 344 
 345 /*
 346  * Function : int NCR5380_pwrite (struct Scsi_Host *instance, 
 347  *      unsigned char *src, int len)
 348  *
 349  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 350  *      src
 351  * 
 352  * Inputs : src = source, len = length in bytes
 353  *
 354  * Returns : 0 on success, non zero on a failure such as a watchdog 
 355  *      timeout.
 356  */
 357 
 358 static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
     /*  */
 359     int len) {
 360     register unsigned char *reg = (unsigned char *) (instance->base + 
 361         T_DATA_REG_OFFSET), *s = src;
 362     register i = len;
 363 
 364 #if 0
 365     for (; i; --i) {
 366         while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 367 #else
 368     while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
 369     for (; i; --i) {
 370 #endif
 371         *reg = *s++;
 372     }
 373 
 374     if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 375         unsigned char tmp;
 376         volatile unsigned char *foo;
 377         foo = instance->base + T_CONTROL_REG_OFFSET;
 378         tmp = *foo;
 379         *foo = tmp | T_CR_CT;
 380         *foo = tmp;
 381         printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
 382             instance->host_no);
 383         return -1;
 384     } else 
 385         return 0;
 386 }
 387 
 388 #include "NCR5380.c"
/* */
root/drivers/scsi/t128.c

DEFINITIONS
