drivers/scsi/dtc.c

   1 /*
   2  * DTC 3180/3280 driver, by
   3  *      Ray Van Tassle  rayvt@comm.mot.com
   4  *
   5  *      taken from ...
   6  *      Trantor T128/T128F/T228 driver by...
   7  *
   8  *      Drew Eckhardt
   9  *      Visionary Computing
  10  *      (Unix and Linux consulting and custom programming)
  11  *      drew@colorado.edu
  12  *      +1 (303) 440-4894
  13  */
  14
  15 /*
  16  * The card is detected and initialized in one of several ways :
  17  * 1.  Autoprobe (default) - since the board is memory mapped,
  18  *     a BIOS signature is scanned for to locate the registers.
  19  *     An interrupt is triggered to autoprobe for the interrupt
  20  *     line.
  21  *
  22  * 2.  With command line overrides - dtc=address,irq may be
  23  *     used on the LILO command line to override the defaults.
  24  *
  25 */
  26
  27 /*----------------------------------------------------------------*/
  28 /* the following will set the monitor border color (useful to find
  29  where something crashed or gets stuck at */
  30 /* 1 = blue
  31  2 = green
  32  3 = cyan
  33  4 = red
  34  5 = magenta
  35  6 = yellow
  36  7 = white
  37 */
  38 #if 0
  39 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
  40 #else
  41 #define rtrc(i) {}
  42 #endif
  43
  44
  45 #include <linux/module.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/string.h>
  48 #include <linux/init.h>
  49 #include <linux/interrupt.h>
  50 #include <linux/io.h>
  51 #include <scsi/scsi_host.h>
  52
  53 #include "dtc.h"
  54 #include "NCR5380.h"
  55
  56 /*
  57  * The DTC3180 & 3280 boards are memory mapped.
  58  *
  59  */
  60
  61 /*
  62  */
  63 /* Offset from DTC_5380_OFFSET */
  64 #define DTC_CONTROL_REG         0x100   /* rw */
  65 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
  66 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
  67
  68 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
  69 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
  70 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
  71 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
  72 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
  73 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
  74 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
  75 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
  76 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
  77 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
  78
  79
  80 #define DTC_BLK_CNT             0x101   /* rw
  81                                          * # of 128-byte blocks to transfer */
  82
  83
  84 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
  85
  86 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
  87 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
  88                                          * after disconnect/reconnect*/
  89
  90 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
  91
  92 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
  93 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
  94
  95 static struct override {
  96         unsigned int address;
  97         int irq;
  98 } overrides
  99 #ifdef OVERRIDE
 100 [] __initdata = OVERRIDE;
 101 #else
 102 [4] __initdata = {
 103         { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
 104 };
 105 #endif
 106
 107 #define NO_OVERRIDES ARRAY_SIZE(overrides)
 108
 109 static struct base {
 110         unsigned long address;
 111         int noauto;
 112 } bases[] __initdata = {
 113         { 0xcc000, 0 },
 114         { 0xc8000, 0 },
 115         { 0xdc000, 0 },
 116         { 0xd8000, 0 }
 117 };
 118
 119 #define NO_BASES ARRAY_SIZE(bases)
 120
 121 static const struct signature {
 122         const char *string;
 123         int offset;
 124 } signatures[] = {
 125         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 126 };
 127
 128 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 129
 130 #ifndef MODULE
 131 /*
 132  * Function : dtc_setup(char *str, int *ints)
 133  *
 134  * Purpose : LILO command line initialization of the overrides array,
 135  *
 136  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 137  *      equal to the number of ints.
 138  *
 139  */
 140
 141 static int __init dtc_setup(char *str)
 142 {
 143         static int commandline_current;
 144         int i;
 145         int ints[10];
 146
 147         get_options(str, ARRAY_SIZE(ints), ints);
 148         if (ints[0] != 2)
 149                 printk("dtc_setup: usage dtc=address,irq\n");
 150         else if (commandline_current < NO_OVERRIDES) {
 151                 overrides[commandline_current].address = ints[1];
 152                 overrides[commandline_current].irq = ints[2];
 153                 for (i = 0; i < NO_BASES; ++i)
 154                         if (bases[i].address == ints[1]) {
 155                                 bases[i].noauto = 1;
 156                                 break;
 157                         }
 158                 ++commandline_current;
 159         }
 160         return 1;
 161 }
 162
 163 __setup("dtc=", dtc_setup);
 164 #endif
 165
 166 /*
 167  * Function : int dtc_detect(struct scsi_host_template * tpnt)
 168  *
 169  * Purpose : detects and initializes DTC 3180/3280 controllers
 170  *      that were autoprobed, overridden on the LILO command line,
 171  *      or specified at compile time.
 172  *
 173  * Inputs : tpnt - template for this SCSI adapter.
 174  *
 175  * Returns : 1 if a host adapter was found, 0 if not.
 176  *
 177 */
 178
 179 static int __init dtc_detect(struct scsi_host_template * tpnt)
 180 {
 181         static int current_override, current_base;
 182         struct Scsi_Host *instance;
 183         unsigned int addr;
 184         void __iomem *base;
 185         int sig, count;
 186
 187         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 188                 addr = 0;
 189                 base = NULL;
 190
 191                 if (overrides[current_override].address) {
 192                         addr = overrides[current_override].address;
 193                         base = ioremap(addr, 0x2000);
 194                         if (!base)
 195                                 addr = 0;
 196                 } else
 197                         for (; !addr && (current_base < NO_BASES); ++current_base) {
 198                                 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
 199                                         (unsigned int)bases[current_base].address);
 200                                 if (bases[current_base].noauto)
 201                                         continue;
 202                                 base = ioremap(bases[current_base].address, 0x2000);
 203                                 if (!base)
 204                                         continue;
 205                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 206                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 207                                                 addr = bases[current_base].address;
 208                                                 dprintk(NDEBUG_INIT, "dtc: detected board\n");
 209                                                 goto found;
 210                                         }
 211                                 }
 212                                 iounmap(base);
 213                         }
 214
 215                 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
 216
 217                 if (!addr)
 218                         break;
 219
 220 found:
 221                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 222                 if (instance == NULL)
 223                         goto out_unmap;
 224
 225                 instance->base = addr;
 226                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 227
 228                 if (NCR5380_init(instance, FLAG_LATE_DMA_SETUP))
 229                         goto out_unregister;
 230
 231                 NCR5380_maybe_reset_bus(instance);
 232
 233                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 234                 if (overrides[current_override].irq != IRQ_AUTO)
 235                         instance->irq = overrides[current_override].irq;
 236                 else
 237                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 238
 239                 /* Compatibility with documented NCR5380 kernel parameters */
 240                 if (instance->irq == 255)
 241                         instance->irq = NO_IRQ;
 242
 243                 /* With interrupts enabled, it will sometimes hang when doing heavy
 244                  * reads. So better not enable them until I finger it out. */
 245                 instance->irq = NO_IRQ;
 246
 247                 if (instance->irq != NO_IRQ)
 248                         if (request_irq(instance->irq, dtc_intr, 0,
 249                                         "dtc", instance)) {
 250                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 251                                 instance->irq = NO_IRQ;
 252                         }
 253
 254                 if (instance->irq == NO_IRQ) {
 255                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 256                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 257                 }
 258
 259                 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
 260                         instance->host_no, instance->irq);
 261
 262                 ++current_override;
 263                 ++count;
 264         }
 265         return count;
 266
 267 out_unregister:
 268         scsi_unregister(instance);
 269 out_unmap:
 270         iounmap(base);
 271         return count;
 272 }
 273
 274 /*
 275  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 276  *
 277  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 278  *      the specified device / size.
 279  *
 280  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 281  *      major / minor, ip[] = {heads, sectors, cylinders}
 282  *
 283  * Returns : always 0 (success), initializes ip
 284  *
 285 */
 286
 287 /*
 288  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 289  * using hard disks on a trantor should verify that this mapping corresponds
 290  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 291  * and matching the H_C_S coordinates to what DOS uses.
 292 */
 293
 294 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 295                          sector_t capacity, int *ip)
 296 {
 297         int size = capacity;
 298
 299         ip[0] = 64;
 300         ip[1] = 32;
 301         ip[2] = size >> 11;
 302         return 0;
 303 }
 304
 305
 306 /****************************************************************
 307  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 308  *      unsigned char *dst, int len)
 309  *
 310  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 311  *      dst
 312  *
 313  * Inputs : dst = destination, len = length in bytes
 314  *
 315  * Returns : 0 on success, non zero on a failure such as a watchdog
 316  *      timeout.
 317 */
 318
 319 static inline int dtc_pread(struct Scsi_Host *instance,
 320                             unsigned char *dst, int len)
 321 {
 322         unsigned char *d = dst;
 323         int i;                  /* For counting time spent in the poll-loop */
 324         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 325
 326         i = 0;
 327         if (instance->irq == NO_IRQ)
 328                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 329         else
 330                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 331         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 332         rtrc(1);
 333         while (len > 0) {
 334                 rtrc(2);
 335                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 336                         ++i;
 337                 rtrc(3);
 338                 memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
 339                 d += 128;
 340                 len -= 128;
 341                 rtrc(7);
 342                 /*** with int's on, it sometimes hangs after here.
 343                  * Looks like something makes HBNR go away. */
 344         }
 345         rtrc(4);
 346         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 347                 ++i;
 348         rtrc(0);
 349         return (0);
 350 }
 351
 352 /****************************************************************
 353  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 354  *      unsigned char *src, int len)
 355  *
 356  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 357  *      src
 358  *
 359  * Inputs : src = source, len = length in bytes
 360  *
 361  * Returns : 0 on success, non zero on a failure such as a watchdog
 362  *      timeout.
 363 */
 364
 365 static inline int dtc_pwrite(struct Scsi_Host *instance,
 366                              unsigned char *src, int len)
 367 {
 368         int i;
 369         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 370
 371         if (instance->irq == NO_IRQ)
 372                 NCR5380_write(DTC_CONTROL_REG, 0);
 373         else
 374                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 375         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 376         for (i = 0; len > 0; ++i) {
 377                 rtrc(5);
 378                 /* Poll until the host buffer can accept data. */
 379                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 380                         ++i;
 381                 rtrc(3);
 382                 memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
 383                 src += 128;
 384                 len -= 128;
 385         }
 386         rtrc(4);
 387         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 388                 ++i;
 389         rtrc(6);
 390         /* Wait until the last byte has been sent to the disk */
 391         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 392                 ++i;
 393         rtrc(7);
 394         /* Check for parity error here. fixme. */
 395         rtrc(0);
 396         return (0);
 397 }
 398
 399 static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
 400 {
 401         int transfersize = cmd->transfersize;
 402
 403         /* Limit transfers to 32K, for xx400 & xx406
 404          * pseudoDMA that transfers in 128 bytes blocks.
 405          */
 406         if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
 407             !(cmd->SCp.this_residual % transfersize))
 408                 transfersize = 32 * 1024;
 409
 410         return transfersize;
 411 }
 412
 413 MODULE_LICENSE("GPL");
 414
 415 #include "NCR5380.c"
 416
 417 static int dtc_release(struct Scsi_Host *shost)
 418 {
 419         struct NCR5380_hostdata *hostdata = shost_priv(shost);
 420
 421         if (shost->irq != NO_IRQ)
 422                 free_irq(shost->irq, shost);
 423         NCR5380_exit(shost);
 424         scsi_unregister(shost);
 425         iounmap(hostdata->base);
 426         return 0;
 427 }
 428
 429 static struct scsi_host_template driver_template = {
 430         .name                   = "DTC 3180/3280",
 431         .detect                 = dtc_detect,
 432         .release                = dtc_release,
 433         .proc_name              = "dtc3x80",
 434         .info                   = dtc_info,
 435         .queuecommand           = dtc_queue_command,
 436         .eh_abort_handler       = dtc_abort,
 437         .eh_bus_reset_handler   = dtc_bus_reset,
 438         .bios_param             = dtc_biosparam,
 439         .can_queue              = 32,
 440         .this_id                = 7,
 441         .sg_tablesize           = SG_ALL,
 442         .cmd_per_lun            = 2,
 443         .use_clustering         = DISABLE_CLUSTERING,
 444         .cmd_size               = NCR5380_CMD_SIZE,
 445         .max_sectors            = 128,
 446 };
 447 #include "scsi_module.c"