drivers/scsi/dtc.c

   1 #define PSEUDO_DMA
   2 #define DONT_USE_INTR
   3
   4 /*
   5  * DTC 3180/3280 driver, by
   6  *      Ray Van Tassle  rayvt@comm.mot.com
   7  *
   8  *      taken from ...
   9  *      Trantor T128/T128F/T228 driver by...
  10  *
  11  *      Drew Eckhardt
  12  *      Visionary Computing
  13  *      (Unix and Linux consulting and custom programming)
  14  *      drew@colorado.edu
  15  *      +1 (303) 440-4894
  16  */
  17
  18 /*
  19  * The card is detected and initialized in one of several ways :
  20  * 1.  Autoprobe (default) - since the board is memory mapped,
  21  *     a BIOS signature is scanned for to locate the registers.
  22  *     An interrupt is triggered to autoprobe for the interrupt
  23  *     line.
  24  *
  25  * 2.  With command line overrides - dtc=address,irq may be
  26  *     used on the LILO command line to override the defaults.
  27  *
  28 */
  29
  30 /*----------------------------------------------------------------*/
  31 /* the following will set the monitor border color (useful to find
  32  where something crashed or gets stuck at */
  33 /* 1 = blue
  34  2 = green
  35  3 = cyan
  36  4 = red
  37  5 = magenta
  38  6 = yellow
  39  7 = white
  40 */
  41 #if 0
  42 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
  43 #else
  44 #define rtrc(i) {}
  45 #endif
  46
  47
  48 #include <linux/module.h>
  49 #include <linux/blkdev.h>
  50 #include <linux/string.h>
  51 #include <linux/init.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/io.h>
  54 #include <scsi/scsi_host.h>
  55
  56 #include "dtc.h"
  57 #define AUTOPROBE_IRQ
  58 #include "NCR5380.h"
  59
  60 /*
  61  * The DTC3180 & 3280 boards are memory mapped.
  62  *
  63  */
  64
  65 /*
  66  */
  67 /* Offset from DTC_5380_OFFSET */
  68 #define DTC_CONTROL_REG         0x100   /* rw */
  69 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
  70 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
  71
  72 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
  73 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
  74 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
  75 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
  76 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
  77 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
  78 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
  79 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
  80 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
  81 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
  82
  83
  84 #define DTC_BLK_CNT             0x101   /* rw
  85                                          * # of 128-byte blocks to transfer */
  86
  87
  88 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
  89
  90 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
  91 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
  92                                          * after disconnect/reconnect*/
  93
  94 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
  95
  96 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
  97 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
  98
  99 static struct override {
 100         unsigned int address;
 101         int irq;
 102 } overrides
 103 #ifdef OVERRIDE
 104 [] __initdata = OVERRIDE;
 105 #else
 106 [4] __initdata = {
 107         { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
 108 };
 109 #endif
 110
 111 #define NO_OVERRIDES ARRAY_SIZE(overrides)
 112
 113 static struct base {
 114         unsigned long address;
 115         int noauto;
 116 } bases[] __initdata = {
 117         { 0xcc000, 0 },
 118         { 0xc8000, 0 },
 119         { 0xdc000, 0 },
 120         { 0xd8000, 0 }
 121 };
 122
 123 #define NO_BASES ARRAY_SIZE(bases)
 124
 125 static const struct signature {
 126         const char *string;
 127         int offset;
 128 } signatures[] = {
 129         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 130 };
 131
 132 #define NO_SIGNATURES ARRAY_SIZE(signatures)
 133
 134 #ifndef MODULE
 135 /*
 136  * Function : dtc_setup(char *str, int *ints)
 137  *
 138  * Purpose : LILO command line initialization of the overrides array,
 139  *
 140  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 141  *      equal to the number of ints.
 142  *
 143  */
 144
 145 static int __init dtc_setup(char *str)
 146 {
 147         static int commandline_current;
 148         int i;
 149         int ints[10];
 150
 151         get_options(str, ARRAY_SIZE(ints), ints);
 152         if (ints[0] != 2)
 153                 printk("dtc_setup: usage dtc=address,irq\n");
 154         else if (commandline_current < NO_OVERRIDES) {
 155                 overrides[commandline_current].address = ints[1];
 156                 overrides[commandline_current].irq = ints[2];
 157                 for (i = 0; i < NO_BASES; ++i)
 158                         if (bases[i].address == ints[1]) {
 159                                 bases[i].noauto = 1;
 160                                 break;
 161                         }
 162                 ++commandline_current;
 163         }
 164         return 1;
 165 }
 166
 167 __setup("dtc=", dtc_setup);
 168 #endif
 169
 170 /*
 171  * Function : int dtc_detect(struct scsi_host_template * tpnt)
 172  *
 173  * Purpose : detects and initializes DTC 3180/3280 controllers
 174  *      that were autoprobed, overridden on the LILO command line,
 175  *      or specified at compile time.
 176  *
 177  * Inputs : tpnt - template for this SCSI adapter.
 178  *
 179  * Returns : 1 if a host adapter was found, 0 if not.
 180  *
 181 */
 182
 183 static int __init dtc_detect(struct scsi_host_template * tpnt)
 184 {
 185         static int current_override, current_base;
 186         struct Scsi_Host *instance;
 187         unsigned int addr;
 188         void __iomem *base;
 189         int sig, count;
 190
 191         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 192                 addr = 0;
 193                 base = NULL;
 194
 195                 if (overrides[current_override].address) {
 196                         addr = overrides[current_override].address;
 197                         base = ioremap(addr, 0x2000);
 198                         if (!base)
 199                                 addr = 0;
 200                 } else
 201                         for (; !addr && (current_base < NO_BASES); ++current_base) {
 202                                 dprintk(NDEBUG_INIT, "dtc: probing address 0x%08x\n",
 203                                         (unsigned int)bases[current_base].address);
 204                                 if (bases[current_base].noauto)
 205                                         continue;
 206                                 base = ioremap(bases[current_base].address, 0x2000);
 207                                 if (!base)
 208                                         continue;
 209                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 210                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 211                                                 addr = bases[current_base].address;
 212                                                 dprintk(NDEBUG_INIT, "dtc: detected board\n");
 213                                                 goto found;
 214                                         }
 215                                 }
 216                                 iounmap(base);
 217                         }
 218
 219                 dprintk(NDEBUG_INIT, "dtc: addr = 0x%08x\n", addr);
 220
 221                 if (!addr)
 222                         break;
 223
 224 found:
 225                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 226                 if (instance == NULL)
 227                         goto out_unmap;
 228
 229                 instance->base = addr;
 230                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 231
 232                 if (NCR5380_init(instance, FLAG_NO_DMA_FIXUP))
 233                         goto out_unregister;
 234
 235                 NCR5380_maybe_reset_bus(instance);
 236
 237                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 238                 if (overrides[current_override].irq != IRQ_AUTO)
 239                         instance->irq = overrides[current_override].irq;
 240                 else
 241                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 242
 243                 /* Compatibility with documented NCR5380 kernel parameters */
 244                 if (instance->irq == 255)
 245                         instance->irq = NO_IRQ;
 246
 247 #ifndef DONT_USE_INTR
 248                 /* With interrupts enabled, it will sometimes hang when doing heavy
 249                  * reads. So better not enable them until I finger it out. */
 250                 if (instance->irq != NO_IRQ)
 251                         if (request_irq(instance->irq, dtc_intr, 0,
 252                                         "dtc", instance)) {
 253                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 254                                 instance->irq = NO_IRQ;
 255                         }
 256
 257                 if (instance->irq == NO_IRQ) {
 258                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 259                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 260                 }
 261 #else
 262                 if (instance->irq != NO_IRQ)
 263                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 264                 instance->irq = NO_IRQ;
 265 #endif
 266                 dprintk(NDEBUG_INIT, "scsi%d : irq = %d\n",
 267                         instance->host_no, instance->irq);
 268
 269                 ++current_override;
 270                 ++count;
 271         }
 272         return count;
 273
 274 out_unregister:
 275         scsi_unregister(instance);
 276 out_unmap:
 277         iounmap(base);
 278         return count;
 279 }
 280
 281 /*
 282  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 283  *
 284  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 285  *      the specified device / size.
 286  *
 287  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 288  *      major / minor, ip[] = {heads, sectors, cylinders}
 289  *
 290  * Returns : always 0 (success), initializes ip
 291  *
 292 */
 293
 294 /*
 295  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 296  * using hard disks on a trantor should verify that this mapping corresponds
 297  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 298  * and matching the H_C_S coordinates to what DOS uses.
 299 */
 300
 301 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 302                          sector_t capacity, int *ip)
 303 {
 304         int size = capacity;
 305
 306         ip[0] = 64;
 307         ip[1] = 32;
 308         ip[2] = size >> 11;
 309         return 0;
 310 }
 311
 312
 313 /****************************************************************
 314  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 315  *      unsigned char *dst, int len)
 316  *
 317  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 318  *      dst
 319  *
 320  * Inputs : dst = destination, len = length in bytes
 321  *
 322  * Returns : 0 on success, non zero on a failure such as a watchdog
 323  *      timeout.
 324 */
 325
 326 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 327 {
 328         unsigned char *d = dst;
 329         int i;                  /* For counting time spent in the poll-loop */
 330         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 331
 332         i = 0;
 333         if (instance->irq == NO_IRQ)
 334                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 335         else
 336                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 337         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 338         rtrc(1);
 339         while (len > 0) {
 340                 rtrc(2);
 341                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 342                         ++i;
 343                 rtrc(3);
 344                 memcpy_fromio(d, hostdata->base + DTC_DATA_BUF, 128);
 345                 d += 128;
 346                 len -= 128;
 347                 rtrc(7);
 348                 /*** with int's on, it sometimes hangs after here.
 349                  * Looks like something makes HBNR go away. */
 350         }
 351         rtrc(4);
 352         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 353                 ++i;
 354         rtrc(0);
 355         if (i > hostdata->spin_max_r)
 356                 hostdata->spin_max_r = i;
 357         return (0);
 358 }
 359
 360 /****************************************************************
 361  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 362  *      unsigned char *src, int len)
 363  *
 364  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 365  *      src
 366  *
 367  * Inputs : src = source, len = length in bytes
 368  *
 369  * Returns : 0 on success, non zero on a failure such as a watchdog
 370  *      timeout.
 371 */
 372
 373 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 374 {
 375         int i;
 376         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 377
 378         if (instance->irq == NO_IRQ)
 379                 NCR5380_write(DTC_CONTROL_REG, 0);
 380         else
 381                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 382         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 383         for (i = 0; len > 0; ++i) {
 384                 rtrc(5);
 385                 /* Poll until the host buffer can accept data. */
 386                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 387                         ++i;
 388                 rtrc(3);
 389                 memcpy_toio(hostdata->base + DTC_DATA_BUF, src, 128);
 390                 src += 128;
 391                 len -= 128;
 392         }
 393         rtrc(4);
 394         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 395                 ++i;
 396         rtrc(6);
 397         /* Wait until the last byte has been sent to the disk */
 398         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 399                 ++i;
 400         rtrc(7);
 401         /* Check for parity error here. fixme. */
 402         rtrc(0);
 403         if (i > hostdata->spin_max_w)
 404                 hostdata->spin_max_w = i;
 405         return (0);
 406 }
 407
 408 static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
 409 {
 410         int transfersize = cmd->transfersize;
 411
 412         /* Limit transfers to 32K, for xx400 & xx406
 413          * pseudoDMA that transfers in 128 bytes blocks.
 414          */
 415         if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
 416             !(cmd->SCp.this_residual % transfersize))
 417                 transfersize = 32 * 1024;
 418
 419         return transfersize;
 420 }
 421
 422 MODULE_LICENSE("GPL");
 423
 424 #include "NCR5380.c"
 425
 426 static int dtc_release(struct Scsi_Host *shost)
 427 {
 428         struct NCR5380_hostdata *hostdata = shost_priv(shost);
 429
 430         if (shost->irq != NO_IRQ)
 431                 free_irq(shost->irq, shost);
 432         NCR5380_exit(shost);
 433         scsi_unregister(shost);
 434         iounmap(hostdata->base);
 435         return 0;
 436 }
 437
 438 static struct scsi_host_template driver_template = {
 439         .name                   = "DTC 3180/3280",
 440         .detect                 = dtc_detect,
 441         .release                = dtc_release,
 442         .proc_name              = "dtc3x80",
 443         .show_info              = dtc_show_info,
 444         .write_info             = dtc_write_info,
 445         .info                   = dtc_info,
 446         .queuecommand           = dtc_queue_command,
 447         .eh_abort_handler       = dtc_abort,
 448         .eh_bus_reset_handler   = dtc_bus_reset,
 449         .bios_param             = dtc_biosparam,
 450         .can_queue              = 32,
 451         .this_id                = 7,
 452         .sg_tablesize           = SG_ALL,
 453         .cmd_per_lun            = 2,
 454         .use_clustering         = DISABLE_CLUSTERING,
 455         .cmd_size               = NCR5380_CMD_SIZE,
 456         .max_sectors            = 128,
 457 };
 458 #include "scsi_module.c"