drivers/scsi/t128.c

   1 #define PSEUDO_DMA
   2
   3 /*
   4  * Trantor T128/T128F/T228 driver
   5  *      Note : architecturally, the T100 and T130 are different and won't
   6  *      work
   7  *
   8  * Copyright 1993, Drew Eckhardt
   9  *      Visionary Computing
  10  *      (Unix and Linux consulting and custom programming)
  11  *      drew@colorado.edu
  12  *      +1 (303) 440-4894
  13  *
  14  * For more information, please consult
  15  *
  16  * Trantor Systems, Ltd.
  17  * T128/T128F/T228 SCSI Host Adapter
  18  * Hardware Specifications
  19  *
  20  * Trantor Systems, Ltd.
  21  * 5415 Randall Place
  22  * Fremont, CA 94538
  23  * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
  24  */
  25
  26 /*
  27  * The card is detected and initialized in one of several ways :
  28  * 1.  Autoprobe (default) - since the board is memory mapped,
  29  *     a BIOS signature is scanned for to locate the registers.
  30  *     An interrupt is triggered to autoprobe for the interrupt
  31  *     line.
  32  *
  33  * 2.  With command line overrides - t128=address,irq may be
  34  *     used on the LILO command line to override the defaults.
  35  *
  36  * 3.  With the T128_OVERRIDE compile time define.  This is
  37  *     specified as an array of address, irq tuples.  Ie, for
  38  *     one board at the default 0xcc000 address, IRQ5, I could say
  39  *     -DT128_OVERRIDE={{0xcc000, 5}}
  40  *
  41  *     Note that if the override methods are used, place holders must
  42  *     be specified for other boards in the system.
  43  *
  44  * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
  45  * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
  46  *
  47  * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot
  48  * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
  49  * cc000   off off
  50  * c8000   off on
  51  * dc000   on  off
  52  * d8000   on  on
  53  *
  54  *
  55  * Interrupts
  56  * There is a 12 pin jumper block, jp1, numbered as follows :
  57  *   T128 (JP1)          T128F (J5)
  58  * 2 4 6 8 10 12        11 9  7 5 3 1
  59  * 1 3 5 7 9  11        12 10 8 6 4 2
  60  *
  61  * 3   2-4
  62  * 5   1-3
  63  * 7   3-5
  64  * T128F only
  65  * 10 8-10
  66  * 12 7-9
  67  * 14 10-12
  68  * 15 9-11
  69  */
  70
  71 #include <linux/io.h>
  72 #include <linux/blkdev.h>
  73 #include <linux/interrupt.h>
  74 #include <linux/init.h>
  75 #include <linux/module.h>
  76
  77 #include <scsi/scsi_host.h>
  78 #include "t128.h"
  79 #define AUTOPROBE_IRQ
  80 #include "NCR5380.h"
  81
  82 static struct override {
  83     unsigned long address;
  84     int irq;
  85 } overrides
  86 #ifdef T128_OVERRIDE
  87     [] __initdata = T128_OVERRIDE;
  88 #else
  89     [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
  90         {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
  91 #endif
  92
  93 #define NO_OVERRIDES ARRAY_SIZE(overrides)
  94
  95 static struct base {
  96     unsigned int address;
  97     int noauto;
  98 } bases[] __initdata = {
  99     { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
 100 };
 101
 102 #define NO_BASES ARRAY_SIZE(bases)
 103
 104 static struct signature {
 105     const char *string;
 106     int offset;
 107 } signatures[] __initdata = {
 108 {"TSROM: SCSI BIOS, Version 1.12", 0x36},
 109 };
 110
 111 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 112
 113 #ifndef MODULE
 114 /*
 115  * Function : t128_setup(char *str, int *ints)
 116  *
 117  * Purpose : LILO command line initialization of the overrides array,
 118  *
 119  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 120  *      equal to the number of ints.
 121  *
 122  */
 123
 124 static int __init t128_setup(char *str)
 125 {
 126         static int commandline_current;
 127     int i;
 128     int ints[10];
 129
 130     get_options(str, ARRAY_SIZE(ints), ints);
 131     if (ints[0] != 2)
 132         printk("t128_setup : usage t128=address,irq\n");
 133     else
 134         if (commandline_current < NO_OVERRIDES) {
 135             overrides[commandline_current].address = ints[1];
 136             overrides[commandline_current].irq = ints[2];
 137             for (i = 0; i < NO_BASES; ++i)
 138                 if (bases[i].address == ints[1]) {
 139                     bases[i].noauto = 1;
 140                     break;
 141                 }
 142             ++commandline_current;
 143         }
 144     return 1;
 145 }
 146
 147 __setup("t128=", t128_setup);
 148 #endif
 149
 150 /*
 151  * Function : int t128_detect(struct scsi_host_template * tpnt)
 152  *
 153  * Purpose : detects and initializes T128,T128F, or T228 controllers
 154  *      that were autoprobed, overridden on the LILO command line,
 155  *      or specified at compile time.
 156  *
 157  * Inputs : tpnt - template for this SCSI adapter.
 158  *
 159  * Returns : 1 if a host adapter was found, 0 if not.
 160  *
 161  */
 162
 163 static int __init t128_detect(struct scsi_host_template *tpnt)
 164 {
 165         static int current_override, current_base;
 166     struct Scsi_Host *instance;
 167     unsigned long base;
 168     void __iomem *p;
 169     int sig, count;
 170
 171     for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 172         base = 0;
 173         p = NULL;
 174
 175         if (overrides[current_override].address) {
 176             base = overrides[current_override].address;
 177             p = ioremap(bases[current_base].address, 0x2000);
 178             if (!p)
 179                 base = 0;
 180         } else
 181             for (; !base && (current_base < NO_BASES); ++current_base) {
 182                 dprintk(NDEBUG_INIT, "t128: probing address 0x%08x\n",
 183                         bases[current_base].address);
 184                 if (bases[current_base].noauto)
 185                         continue;
 186                 p = ioremap(bases[current_base].address, 0x2000);
 187                 if (!p)
 188                         continue;
 189                 for (sig = 0; sig < NO_SIGNATURES; ++sig)
 190                     if (check_signature(p + signatures[sig].offset,
 191                                         signatures[sig].string,
 192                                         strlen(signatures[sig].string))) {
 193                         base = bases[current_base].address;
 194                         dprintk(NDEBUG_INIT, "t128: detected board\n");
 195                         goto found;
 196                     }
 197                 iounmap(p);
 198             }
 199
 200         dprintk(NDEBUG_INIT, "t128: base = 0x%08x\n", (unsigned int)base);
 201
 202         if (!base)
 203             break;
 204
 205 found:
 206         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 207         if(instance == NULL)
 208                 goto out_unmap;
 209
 210         instance->base = base;
 211         ((struct NCR5380_hostdata *)instance->hostdata)->base = p;
 212
 213         if (NCR5380_init(instance, 0))
 214                 goto out_unregister;
 215
 216         NCR5380_maybe_reset_bus(instance);
 217
 218         if (overrides[current_override].irq != IRQ_AUTO)
 219             instance->irq = overrides[current_override].irq;
 220         else
 221             instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
 222
 223         /* Compatibility with documented NCR5380 kernel parameters */
 224         if (instance->irq == 255)
 225                 instance->irq = NO_IRQ;
 226
 227         if (instance->irq != NO_IRQ)
 228             if (request_irq(instance->irq, t128_intr, 0, "t128",
 229                             instance)) {
 230                 printk("scsi%d : IRQ%d not free, interrupts disabled\n",
 231                     instance->host_no, instance->irq);
 232                 instance->irq = NO_IRQ;
 233             }
 234
 235         if (instance->irq == NO_IRQ) {
 236             printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 237             printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 238         }
 239
 240         dprintk(NDEBUG_INIT, "scsi%d: irq = %d\n",
 241                 instance->host_no, instance->irq);
 242
 243         ++current_override;
 244         ++count;
 245     }
 246     return count;
 247
 248 out_unregister:
 249         scsi_unregister(instance);
 250 out_unmap:
 251         iounmap(p);
 252         return count;
 253 }
 254
 255 static int t128_release(struct Scsi_Host *shost)
 256 {
 257         struct NCR5380_hostdata *hostdata = shost_priv(shost);
 258
 259         if (shost->irq != NO_IRQ)
 260                 free_irq(shost->irq, shost);
 261         NCR5380_exit(shost);
 262         scsi_unregister(shost);
 263         iounmap(hostdata->base);
 264         return 0;
 265 }
 266
 267 /*
 268  * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
 269  *
 270  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 271  *      the specified device / size.
 272  *
 273  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 274  *      major / minor, ip[] = {heads, sectors, cylinders}
 275  *
 276  * Returns : always 0 (success), initializes ip
 277  *
 278  */
 279
 280 /*
 281  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 282  * using hard disks on a trantor should verify that this mapping corresponds
 283  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 284  * and matching the H_C_S coordinates to what DOS uses.
 285  */
 286
 287 static int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 288                           sector_t capacity, int *ip)
 289 {
 290   ip[0] = 64;
 291   ip[1] = 32;
 292   ip[2] = capacity >> 11;
 293   return 0;
 294 }
 295
 296 /*
 297  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 298  *      unsigned char *dst, int len)
 299  *
 300  * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
 301  *      dst
 302  *
 303  * Inputs : dst = destination, len = length in bytes
 304  *
 305  * Returns : 0 on success, non zero on a failure such as a watchdog
 306  *      timeout.
 307  */
 308
 309 static inline int
 310 NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 311 {
 312         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 313         void __iomem *reg, *base = hostdata->base;
 314     unsigned char *d = dst;
 315     register int i = len;
 316
 317     reg = base + T_DATA_REG_OFFSET;
 318
 319 #if 0
 320     for (; i; --i) {
 321         while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 322 #else
 323     while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 324     for (; i; --i) {
 325 #endif
 326         *d++ = readb(reg);
 327     }
 328
 329     if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 330         unsigned char tmp;
 331         void __iomem *foo = base + T_CONTROL_REG_OFFSET;
 332         tmp = readb(foo);
 333         writeb(tmp | T_CR_CT, foo);
 334         writeb(tmp, foo);
 335         printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
 336             instance->host_no);
 337         return -1;
 338     } else
 339         return 0;
 340 }
 341
 342 /*
 343  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 344  *      unsigned char *src, int len)
 345  *
 346  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 347  *      src
 348  *
 349  * Inputs : src = source, len = length in bytes
 350  *
 351  * Returns : 0 on success, non zero on a failure such as a watchdog
 352  *      timeout.
 353  */
 354
 355 static inline int
 356 NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 357 {
 358         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 359         void __iomem *reg, *base = hostdata->base;
 360     unsigned char *s = src;
 361     register int i = len;
 362
 363     reg = base + T_DATA_REG_OFFSET;
 364
 365 #if 0
 366     for (; i; --i) {
 367         while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 368 #else
 369     while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 370     for (; i; --i) {
 371 #endif
 372         writeb(*s++, reg);
 373     }
 374
 375     if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 376         unsigned char tmp;
 377         void __iomem *foo = base + T_CONTROL_REG_OFFSET;
 378         tmp = readb(foo);
 379         writeb(tmp | T_CR_CT, foo);
 380         writeb(tmp, foo);
 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 MODULE_LICENSE("GPL");
 389
 390 #include "NCR5380.c"
 391
 392 static struct scsi_host_template driver_template = {
 393         .name                   = "Trantor T128/T128F/T228",
 394         .detect                 = t128_detect,
 395         .release                = t128_release,
 396         .proc_name              = "t128",
 397         .show_info              = t128_show_info,
 398         .write_info             = t128_write_info,
 399         .info                   = t128_info,
 400         .queuecommand           = t128_queue_command,
 401         .eh_abort_handler       = t128_abort,
 402         .eh_bus_reset_handler   = t128_bus_reset,
 403         .bios_param             = t128_biosparam,
 404         .can_queue              = 32,
 405         .this_id                = 7,
 406         .sg_tablesize           = SG_ALL,
 407         .cmd_per_lun            = 2,
 408         .use_clustering         = DISABLE_CLUSTERING,
 409         .cmd_size               = NCR5380_CMD_SIZE,
 410         .max_sectors            = 128,
 411 };
 412 #include "scsi_module.c"