drivers/scsi/t128.c

   1 /*
   2  * Trantor T128/T128F/T228 driver
   3  *      Note : architecturally, the T100 and T130 are different and won't
   4  *      work
   5  *
   6  * Copyright 1993, Drew Eckhardt
   7  *      Visionary Computing
   8  *      (Unix and Linux consulting and custom programming)
   9  *      drew@colorado.edu
  10  *      +1 (303) 440-4894
  11  *
  12  * For more information, please consult
  13  *
  14  * Trantor Systems, Ltd.
  15  * T128/T128F/T228 SCSI Host Adapter
  16  * Hardware Specifications
  17  *
  18  * Trantor Systems, Ltd.
  19  * 5415 Randall Place
  20  * Fremont, CA 94538
  21  * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
  22  */
  23
  24 /*
  25  * The card is detected and initialized in one of several ways :
  26  * 1.  Autoprobe (default) - since the board is memory mapped,
  27  *     a BIOS signature is scanned for to locate the registers.
  28  *     An interrupt is triggered to autoprobe for the interrupt
  29  *     line.
  30  *
  31  * 2.  With command line overrides - t128=address,irq may be
  32  *     used on the LILO command line to override the defaults.
  33  *
  34  * 3.  With the T128_OVERRIDE compile time define.  This is
  35  *     specified as an array of address, irq tuples.  Ie, for
  36  *     one board at the default 0xcc000 address, IRQ5, I could say
  37  *     -DT128_OVERRIDE={{0xcc000, 5}}
  38  *
  39  *     Note that if the override methods are used, place holders must
  40  *     be specified for other boards in the system.
  41  *
  42  * T128/T128F jumper/dipswitch settings (note : on my sample, the switches
  43  * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
  44  *
  45  * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot
  46  * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
  47  * cc000   off off
  48  * c8000   off on
  49  * dc000   on  off
  50  * d8000   on  on
  51  *
  52  *
  53  * Interrupts
  54  * There is a 12 pin jumper block, jp1, numbered as follows :
  55  *   T128 (JP1)          T128F (J5)
  56  * 2 4 6 8 10 12        11 9  7 5 3 1
  57  * 1 3 5 7 9  11        12 10 8 6 4 2
  58  *
  59  * 3   2-4
  60  * 5   1-3
  61  * 7   3-5
  62  * T128F only
  63  * 10 8-10
  64  * 12 7-9
  65  * 14 10-12
  66  * 15 9-11
  67  */
  68
  69 #include <linux/io.h>
  70 #include <linux/blkdev.h>
  71 #include <linux/interrupt.h>
  72 #include <linux/init.h>
  73 #include <linux/module.h>
  74
  75 #include <scsi/scsi_host.h>
  76 #include "t128.h"
  77 #include "NCR5380.h"
  78
  79 static struct override {
  80     unsigned long address;
  81     int irq;
  82 } overrides
  83 #ifdef T128_OVERRIDE
  84     [] __initdata = T128_OVERRIDE;
  85 #else
  86     [4] __initdata = {{0, IRQ_AUTO}, {0, IRQ_AUTO},
  87         {0 ,IRQ_AUTO}, {0, IRQ_AUTO}};
  88 #endif
  89
  90 #define NO_OVERRIDES ARRAY_SIZE(overrides)
  91
  92 static struct base {
  93     unsigned int address;
  94     int noauto;
  95 } bases[] __initdata = {
  96     { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
  97 };
  98
  99 #define NO_BASES ARRAY_SIZE(bases)
 100
 101 static struct signature {
 102     const char *string;
 103     int offset;
 104 } signatures[] __initdata = {
 105 {"TSROM: SCSI BIOS, Version 1.12", 0x36},
 106 };
 107
 108 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 109
 110 #ifndef MODULE
 111 /*
 112  * Function : t128_setup(char *str, int *ints)
 113  *
 114  * Purpose : LILO command line initialization of the overrides array,
 115  *
 116  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 117  *      equal to the number of ints.
 118  *
 119  */
 120
 121 static int __init t128_setup(char *str)
 122 {
 123         static int commandline_current;
 124     int i;
 125     int ints[10];
 126
 127     get_options(str, ARRAY_SIZE(ints), ints);
 128     if (ints[0] != 2)
 129         printk("t128_setup : usage t128=address,irq\n");
 130     else
 131         if (commandline_current < NO_OVERRIDES) {
 132             overrides[commandline_current].address = ints[1];
 133             overrides[commandline_current].irq = ints[2];
 134             for (i = 0; i < NO_BASES; ++i)
 135                 if (bases[i].address == ints[1]) {
 136                     bases[i].noauto = 1;
 137                     break;
 138                 }
 139             ++commandline_current;
 140         }
 141     return 1;
 142 }
 143
 144 __setup("t128=", t128_setup);
 145 #endif
 146
 147 /*
 148  * Function : int t128_detect(struct scsi_host_template * tpnt)
 149  *
 150  * Purpose : detects and initializes T128,T128F, or T228 controllers
 151  *      that were autoprobed, overridden on the LILO command line,
 152  *      or specified at compile time.
 153  *
 154  * Inputs : tpnt - template for this SCSI adapter.
 155  *
 156  * Returns : 1 if a host adapter was found, 0 if not.
 157  *
 158  */
 159
 160 static int __init t128_detect(struct scsi_host_template *tpnt)
 161 {
 162         static int current_override, current_base;
 163     struct Scsi_Host *instance;
 164     unsigned long base;
 165     void __iomem *p;
 166     int sig, count;
 167
 168     for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 169         base = 0;
 170         p = NULL;
 171
 172         if (overrides[current_override].address) {
 173             base = overrides[current_override].address;
 174             p = ioremap(bases[current_base].address, 0x2000);
 175             if (!p)
 176                 base = 0;
 177         } else
 178             for (; !base && (current_base < NO_BASES); ++current_base) {
 179                 dprintk(NDEBUG_INIT, "t128: probing address 0x%08x\n",
 180                         bases[current_base].address);
 181                 if (bases[current_base].noauto)
 182                         continue;
 183                 p = ioremap(bases[current_base].address, 0x2000);
 184                 if (!p)
 185                         continue;
 186                 for (sig = 0; sig < NO_SIGNATURES; ++sig)
 187                     if (check_signature(p + signatures[sig].offset,
 188                                         signatures[sig].string,
 189                                         strlen(signatures[sig].string))) {
 190                         base = bases[current_base].address;
 191                         dprintk(NDEBUG_INIT, "t128: detected board\n");
 192                         goto found;
 193                     }
 194                 iounmap(p);
 195             }
 196
 197         dprintk(NDEBUG_INIT, "t128: base = 0x%08x\n", (unsigned int)base);
 198
 199         if (!base)
 200             break;
 201
 202 found:
 203         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 204         if(instance == NULL)
 205                 goto out_unmap;
 206
 207         instance->base = base;
 208         ((struct NCR5380_hostdata *)instance->hostdata)->base = p;
 209
 210         if (NCR5380_init(instance, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP))
 211                 goto out_unregister;
 212
 213         NCR5380_maybe_reset_bus(instance);
 214
 215         if (overrides[current_override].irq != IRQ_AUTO)
 216             instance->irq = overrides[current_override].irq;
 217         else
 218             instance->irq = NCR5380_probe_irq(instance, T128_IRQS);
 219
 220         /* Compatibility with documented NCR5380 kernel parameters */
 221         if (instance->irq == 255)
 222                 instance->irq = NO_IRQ;
 223
 224         if (instance->irq != NO_IRQ)
 225             if (request_irq(instance->irq, t128_intr, 0, "t128",
 226                             instance)) {
 227                 printk("scsi%d : IRQ%d not free, interrupts disabled\n",
 228                     instance->host_no, instance->irq);
 229                 instance->irq = NO_IRQ;
 230             }
 231
 232         if (instance->irq == NO_IRQ) {
 233             printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 234             printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 235         }
 236
 237         dprintk(NDEBUG_INIT, "scsi%d: irq = %d\n",
 238                 instance->host_no, instance->irq);
 239
 240         ++current_override;
 241         ++count;
 242     }
 243     return count;
 244
 245 out_unregister:
 246         scsi_unregister(instance);
 247 out_unmap:
 248         iounmap(p);
 249         return count;
 250 }
 251
 252 static int t128_release(struct Scsi_Host *shost)
 253 {
 254         struct NCR5380_hostdata *hostdata = shost_priv(shost);
 255
 256         if (shost->irq != NO_IRQ)
 257                 free_irq(shost->irq, shost);
 258         NCR5380_exit(shost);
 259         scsi_unregister(shost);
 260         iounmap(hostdata->base);
 261         return 0;
 262 }
 263
 264 /*
 265  * Function : int t128_biosparam(Disk * disk, struct block_device *dev, int *ip)
 266  *
 267  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 268  *      the specified device / size.
 269  *
 270  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 271  *      major / minor, ip[] = {heads, sectors, cylinders}
 272  *
 273  * Returns : always 0 (success), initializes ip
 274  *
 275  */
 276
 277 /*
 278  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 279  * using hard disks on a trantor should verify that this mapping corresponds
 280  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 281  * and matching the H_C_S coordinates to what DOS uses.
 282  */
 283
 284 static int t128_biosparam(struct scsi_device *sdev, struct block_device *bdev,
 285                           sector_t capacity, int *ip)
 286 {
 287   ip[0] = 64;
 288   ip[1] = 32;
 289   ip[2] = capacity >> 11;
 290   return 0;
 291 }
 292
 293 /*
 294  * Function : int t128_pread (struct Scsi_Host *instance,
 295  *      unsigned char *dst, int len)
 296  *
 297  * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to
 298  *      dst
 299  *
 300  * Inputs : dst = destination, len = length in bytes
 301  *
 302  * Returns : 0 on success, non zero on a failure such as a watchdog
 303  *      timeout.
 304  */
 305
 306 static inline int t128_pread(struct Scsi_Host *instance,
 307                              unsigned char *dst, int len)
 308 {
 309         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 310         void __iomem *reg, *base = hostdata->base;
 311     unsigned char *d = dst;
 312     register int i = len;
 313
 314     reg = base + T_DATA_REG_OFFSET;
 315
 316 #if 0
 317     for (; i; --i) {
 318         while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 319 #else
 320     while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 321     for (; i; --i) {
 322 #endif
 323         *d++ = readb(reg);
 324     }
 325
 326     if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 327         unsigned char tmp;
 328         void __iomem *foo = base + T_CONTROL_REG_OFFSET;
 329         tmp = readb(foo);
 330         writeb(tmp | T_CR_CT, foo);
 331         writeb(tmp, foo);
 332         printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
 333             instance->host_no);
 334         return -1;
 335     } else
 336         return 0;
 337 }
 338
 339 /*
 340  * Function : int t128_pwrite (struct Scsi_Host *instance,
 341  *      unsigned char *src, int len)
 342  *
 343  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 344  *      src
 345  *
 346  * Inputs : src = source, len = length in bytes
 347  *
 348  * Returns : 0 on success, non zero on a failure such as a watchdog
 349  *      timeout.
 350  */
 351
 352 static inline int t128_pwrite(struct Scsi_Host *instance,
 353                               unsigned char *src, int len)
 354 {
 355         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 356         void __iomem *reg, *base = hostdata->base;
 357     unsigned char *s = src;
 358     register int i = len;
 359
 360     reg = base + T_DATA_REG_OFFSET;
 361
 362 #if 0
 363     for (; i; --i) {
 364         while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 365 #else
 366     while (!(readb(base+T_STATUS_REG_OFFSET) & T_ST_RDY)) barrier();
 367     for (; i; --i) {
 368 #endif
 369         writeb(*s++, reg);
 370     }
 371
 372     if (readb(base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
 373         unsigned char tmp;
 374         void __iomem *foo = base + T_CONTROL_REG_OFFSET;
 375         tmp = readb(foo);
 376         writeb(tmp | T_CR_CT, foo);
 377         writeb(tmp, foo);
 378         printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
 379             instance->host_no);
 380         return -1;
 381     } else
 382         return 0;
 383 }
 384
 385 MODULE_LICENSE("GPL");
 386
 387 #include "NCR5380.c"
 388
 389 static struct scsi_host_template driver_template = {
 390         .name                   = "Trantor T128/T128F/T228",
 391         .detect                 = t128_detect,
 392         .release                = t128_release,
 393         .proc_name              = "t128",
 394         .info                   = t128_info,
 395         .queuecommand           = t128_queue_command,
 396         .eh_abort_handler       = t128_abort,
 397         .eh_bus_reset_handler   = t128_bus_reset,
 398         .bios_param             = t128_biosparam,
 399         .can_queue              = 32,
 400         .this_id                = 7,
 401         .sg_tablesize           = SG_ALL,
 402         .cmd_per_lun            = 2,
 403         .use_clustering         = DISABLE_CLUSTERING,
 404         .cmd_size               = NCR5380_CMD_SIZE,
 405         .max_sectors            = 128,
 406 };
 407 #include "scsi_module.c"