drivers/scsi/dtc.c

   1
   2 #define AUTOSENSE
   3 #define PSEUDO_DMA
   4 #define DONT_USE_INTR
   5 #define UNSAFE                  /* Leave interrupts enabled during pseudo-dma I/O */
   6 #define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
   7                  NDEBUG_SELECTION+NDEBUG_ARBITRATION)
   8 #define DMA_WORKS_RIGHT
   9
  10
  11 /*
  12  * DTC 3180/3280 driver, by
  13  *      Ray Van Tassle  rayvt@comm.mot.com
  14  *
  15  *      taken from ...
  16  *      Trantor T128/T128F/T228 driver by...
  17  *
  18  *      Drew Eckhardt
  19  *      Visionary Computing
  20  *      (Unix and Linux consulting and custom programming)
  21  *      drew@colorado.edu
  22  *      +1 (303) 440-4894
  23  *
  24  * DISTRIBUTION RELEASE 1.
  25  *
  26  * For more information, please consult
  27  *
  28  * NCR 5380 Family
  29  * SCSI Protocol Controller
  30  * Databook
  31 */
  32
  33 /*
  34  * Options :
  35  * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
  36  *      for commands that return with a CHECK CONDITION status.
  37  *
  38  * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
  39  * increase compared to polled I/O.
  40  *
  41  * PARITY - enable parity checking.  Not supported.
  42  *
  43  * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.
  44  *              You probably want this.
  45  *
  46  * The card is detected and initialized in one of several ways :
  47  * 1.  Autoprobe (default) - since the board is memory mapped,
  48  *     a BIOS signature is scanned for to locate the registers.
  49  *     An interrupt is triggered to autoprobe for the interrupt
  50  *     line.
  51  *
  52  * 2.  With command line overrides - dtc=address,irq may be
  53  *     used on the LILO command line to override the defaults.
  54  *
  55 */
  56
  57 /*----------------------------------------------------------------*/
  58 /* the following will set the monitor border color (useful to find
  59  where something crashed or gets stuck at */
  60 /* 1 = blue
  61  2 = green
  62  3 = cyan
  63  4 = red
  64  5 = magenta
  65  6 = yellow
  66  7 = white
  67 */
  68 #if 0
  69 #define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
  70 #else
  71 #define rtrc(i) {}
  72 #endif
  73
  74
  75 #include <asm/system.h>
  76 #include <linux/module.h>
  77 #include <linux/signal.h>
  78 #include <linux/sched.h>
  79 #include <linux/blkdev.h>
  80 #include <linux/delay.h>
  81 #include <linux/stat.h>
  82 #include <linux/string.h>
  83 #include <linux/init.h>
  84 #include <linux/interrupt.h>
  85 #include <asm/io.h>
  86 #include "scsi.h"
  87 #include <scsi/scsi_host.h>
  88 #include "dtc.h"
  89 #define AUTOPROBE_IRQ
  90 #include "NCR5380.h"
  91
  92
  93 #define DTC_PUBLIC_RELEASE 2
  94
  95 /*#define DTCDEBUG 0x1*/
  96 #define DTCDEBUG_INIT   0x1
  97 #define DTCDEBUG_TRANSFER 0x2
  98
  99 /*
 100  * The DTC3180 & 3280 boards are memory mapped.
 101  *
 102  */
 103
 104 /*
 105  */
 106 /* Offset from DTC_5380_OFFSET */
 107 #define DTC_CONTROL_REG         0x100   /* rw */
 108 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 109 #define CSR_DIR_READ            0x40    /* rw direction, 1 = read 0 = write */
 110
 111 #define CSR_RESET              0x80     /* wo  Resets 53c400 */
 112 #define CSR_5380_REG           0x80     /* ro  5380 registers can be accessed */
 113 #define CSR_TRANS_DIR          0x40     /* rw  Data transfer direction */
 114 #define CSR_SCSI_BUFF_INTR     0x20     /* rw  Enable int on transfer ready */
 115 #define CSR_5380_INTR          0x10     /* rw  Enable 5380 interrupts */
 116 #define CSR_SHARED_INTR        0x08     /* rw  Interrupt sharing */
 117 #define CSR_HOST_BUF_NOT_RDY   0x04     /* ro  Host buffer not ready */
 118 #define CSR_SCSI_BUF_RDY       0x02     /* ro  SCSI buffer ready */
 119 #define CSR_GATED_5380_IRQ     0x01     /* ro  Last block xferred */
 120 #define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)
 121
 122
 123 #define DTC_BLK_CNT             0x101   /* rw
 124                                          * # of 128-byte blocks to transfer */
 125
 126
 127 #define D_CR_ACCESS             0x80    /* ro set=can access 3280 registers */
 128
 129 #define DTC_SWITCH_REG          0x3982  /* ro - DIP switches */
 130 #define DTC_RESUME_XFER         0x3982  /* wo - resume data xfer
 131                                          * after disconnect/reconnect*/
 132
 133 #define DTC_5380_OFFSET         0x3880  /* 8 registers here, see NCR5380.h */
 134
 135 /*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
 136 #define DTC_DATA_BUF            0x3900  /* rw 128 bytes long */
 137
 138 static struct override {
 139         unsigned int address;
 140         int irq;
 141 } overrides
 142 #ifdef OVERRIDE
 143 [] __initdata = OVERRIDE;
 144 #else
 145 [4] __initdata = { {
 146 0, IRQ_AUTO}, {
 147 0, IRQ_AUTO}, {
 148 0, IRQ_AUTO}, {
 149 0, IRQ_AUTO}};
 150 #endif
 151
 152 #define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))
 153
 154 static struct base {
 155         unsigned long address;
 156         int noauto;
 157 } bases[] __initdata = {
 158         { 0xcc000, 0 },
 159         { 0xc8000, 0 },
 160         { 0xdc000, 0 },
 161         { 0xd8000, 0 }
 162 };
 163
 164 #define NO_BASES (sizeof (bases) / sizeof (struct base))
 165
 166 static const struct signature {
 167         const char *string;
 168         int offset;
 169 } signatures[] = {
 170         {"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
 171 };
 172
 173 #define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))
 174
 175 #ifndef MODULE
 176 /*
 177  * Function : dtc_setup(char *str, int *ints)
 178  *
 179  * Purpose : LILO command line initialization of the overrides array,
 180  *
 181  * Inputs : str - unused, ints - array of integer parameters with ints[0]
 182  *      equal to the number of ints.
 183  *
 184 */
 185
 186 static void __init dtc_setup(char *str, int *ints)
 187 {
 188         static int commandline_current = 0;
 189         int i;
 190         if (ints[0] != 2)
 191                 printk("dtc_setup: usage dtc=address,irq\n");
 192         else if (commandline_current < NO_OVERRIDES) {
 193                 overrides[commandline_current].address = ints[1];
 194                 overrides[commandline_current].irq = ints[2];
 195                 for (i = 0; i < NO_BASES; ++i)
 196                         if (bases[i].address == ints[1]) {
 197                                 bases[i].noauto = 1;
 198                                 break;
 199                         }
 200                 ++commandline_current;
 201         }
 202 }
 203 #endif
 204
 205 /*
 206  * Function : int dtc_detect(Scsi_Host_Template * tpnt)
 207  *
 208  * Purpose : detects and initializes DTC 3180/3280 controllers
 209  *      that were autoprobed, overridden on the LILO command line,
 210  *      or specified at compile time.
 211  *
 212  * Inputs : tpnt - template for this SCSI adapter.
 213  *
 214  * Returns : 1 if a host adapter was found, 0 if not.
 215  *
 216 */
 217
 218 static int __init dtc_detect(Scsi_Host_Template * tpnt)
 219 {
 220         static int current_override = 0, current_base = 0;
 221         struct Scsi_Host *instance;
 222         unsigned int addr;
 223         void __iomem *base;
 224         int sig, count;
 225
 226         tpnt->proc_name = "dtc3x80";
 227         tpnt->proc_info = &dtc_proc_info;
 228
 229         for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
 230                 addr = 0;
 231                 base = NULL;
 232
 233                 if (overrides[current_override].address) {
 234                         addr = overrides[current_override].address;
 235                         base = ioremap(addr, 0x2000);
 236                         if (!base)
 237                                 addr = 0;
 238                 } else
 239                         for (; !addr && (current_base < NO_BASES); ++current_base) {
 240 #if (DTCDEBUG & DTCDEBUG_INIT)
 241                                 printk("scsi-dtc : probing address %08x\n", bases[current_base].address);
 242 #endif
 243                                 if (bases[current_base].noauto)
 244                                         continue;
 245                                 base = ioremap(bases[current_base].address, 0x2000);
 246                                 if (!base)
 247                                         continue;
 248                                 for (sig = 0; sig < NO_SIGNATURES; ++sig) {
 249                                         if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
 250                                                 addr = bases[current_base].address;
 251 #if (DTCDEBUG & DTCDEBUG_INIT)
 252                                                 printk("scsi-dtc : detected board.\n");
 253 #endif
 254                                                 goto found;
 255                                         }
 256                                 }
 257                                 iounmap(base);
 258                         }
 259
 260 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 261                 printk("scsi-dtc : base = %08x\n", addr);
 262 #endif
 263
 264                 if (!addr)
 265                         break;
 266
 267 found:
 268                 instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
 269                 if (instance == NULL)
 270                         break;
 271
 272                 instance->base = addr;
 273                 ((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;
 274
 275                 NCR5380_init(instance, 0);
 276
 277                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);  /* Enable int's */
 278                 if (overrides[current_override].irq != IRQ_AUTO)
 279                         instance->irq = overrides[current_override].irq;
 280                 else
 281                         instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);
 282
 283 #ifndef DONT_USE_INTR
 284                 /* With interrupts enabled, it will sometimes hang when doing heavy
 285                  * reads. So better not enable them until I finger it out. */
 286                 if (instance->irq != SCSI_IRQ_NONE)
 287                         if (request_irq(instance->irq, dtc_intr, SA_INTERRUPT, "dtc", instance)) {
 288                                 printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 289                                 instance->irq = SCSI_IRQ_NONE;
 290                         }
 291
 292                 if (instance->irq == SCSI_IRQ_NONE) {
 293                         printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 294                         printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 295                 }
 296 #else
 297                 if (instance->irq != SCSI_IRQ_NONE)
 298                         printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
 299                 instance->irq = SCSI_IRQ_NONE;
 300 #endif
 301 #if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
 302                 printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
 303 #endif
 304
 305                 printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
 306                 if (instance->irq == SCSI_IRQ_NONE)
 307                         printk(" interrupts disabled");
 308                 else
 309                         printk(" irq %d", instance->irq);
 310                 printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, DTC_PUBLIC_RELEASE);
 311                 NCR5380_print_options(instance);
 312                 printk("\n");
 313
 314                 ++current_override;
 315                 ++count;
 316         }
 317         return count;
 318 }
 319
 320 /*
 321  * Function : int dtc_biosparam(Disk * disk, struct block_device *dev, int *ip)
 322  *
 323  * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for
 324  *      the specified device / size.
 325  *
 326  * Inputs : size = size of device in sectors (512 bytes), dev = block device
 327  *      major / minor, ip[] = {heads, sectors, cylinders}
 328  *
 329  * Returns : always 0 (success), initializes ip
 330  *
 331 */
 332
 333 /*
 334  * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 335  * using hard disks on a trantor should verify that this mapping corresponds
 336  * to that used by the BIOS / ASPI driver by running the linux fdisk program
 337  * and matching the H_C_S coordinates to what DOS uses.
 338 */
 339
 340 static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
 341                          sector_t capacity, int *ip)
 342 {
 343         int size = capacity;
 344
 345         ip[0] = 64;
 346         ip[1] = 32;
 347         ip[2] = size >> 11;
 348         return 0;
 349 }
 350
 351
 352 /****************************************************************
 353  * Function : int NCR5380_pread (struct Scsi_Host *instance,
 354  *      unsigned char *dst, int len)
 355  *
 356  * Purpose : Fast 5380 pseudo-dma read function, reads len bytes to
 357  *      dst
 358  *
 359  * Inputs : dst = destination, 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 int dtc_maxi = 0;
 366 static int dtc_wmaxi = 0;
 367
 368 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
 369 {
 370         unsigned char *d = dst;
 371         int i;                  /* For counting time spent in the poll-loop */
 372         NCR5380_local_declare();
 373         NCR5380_setup(instance);
 374
 375         i = 0;
 376         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 377         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 378         if (instance->irq == SCSI_IRQ_NONE)
 379                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
 380         else
 381                 NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
 382         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 383         rtrc(1);
 384         while (len > 0) {
 385                 rtrc(2);
 386                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 387                         ++i;
 388                 rtrc(3);
 389                 memcpy_fromio(d, base + DTC_DATA_BUF, 128);
 390                 d += 128;
 391                 len -= 128;
 392                 rtrc(7);
 393                 /*** with int's on, it sometimes hangs after here.
 394                  * Looks like something makes HBNR go away. */
 395         }
 396         rtrc(4);
 397         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 398                 ++i;
 399         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 400         rtrc(0);
 401         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 402         if (i > dtc_maxi)
 403                 dtc_maxi = i;
 404         return (0);
 405 }
 406
 407 /****************************************************************
 408  * Function : int NCR5380_pwrite (struct Scsi_Host *instance,
 409  *      unsigned char *src, int len)
 410  *
 411  * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 412  *      src
 413  *
 414  * Inputs : src = source, len = length in bytes
 415  *
 416  * Returns : 0 on success, non zero on a failure such as a watchdog
 417  *      timeout.
 418 */
 419
 420 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
 421 {
 422         int i;
 423         NCR5380_local_declare();
 424         NCR5380_setup(instance);
 425
 426         NCR5380_read(RESET_PARITY_INTERRUPT_REG);
 427         NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
 428         /* set direction (write) */
 429         if (instance->irq == SCSI_IRQ_NONE)
 430                 NCR5380_write(DTC_CONTROL_REG, 0);
 431         else
 432                 NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
 433         NCR5380_write(DTC_BLK_CNT, len >> 7);   /* Block count */
 434         for (i = 0; len > 0; ++i) {
 435                 rtrc(5);
 436                 /* Poll until the host buffer can accept data. */
 437                 while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
 438                         ++i;
 439                 rtrc(3);
 440                 memcpy_toio(base + DTC_DATA_BUF, src, 128);
 441                 src += 128;
 442                 len -= 128;
 443         }
 444         rtrc(4);
 445         while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
 446                 ++i;
 447         rtrc(6);
 448         /* Wait until the last byte has been sent to the disk */
 449         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 450                 ++i;
 451         rtrc(7);
 452         /* Check for parity error here. fixme. */
 453         NCR5380_write(MODE_REG, 0);     /* Clear the operating mode */
 454         rtrc(0);
 455         if (i > dtc_wmaxi)
 456                 dtc_wmaxi = i;
 457         return (0);
 458 }
 459
 460 MODULE_LICENSE("GPL");
 461
 462 #include "NCR5380.c"
 463
 464 static int dtc_release(struct Scsi_Host *shost)
 465 {
 466         NCR5380_local_declare();
 467         NCR5380_setup(shost);
 468         if (shost->irq)
 469                 free_irq(shost->irq, NULL);
 470         NCR5380_exit(shost);
 471         if (shost->io_port && shost->n_io_port)
 472                 release_region(shost->io_port, shost->n_io_port);
 473         scsi_unregister(shost);
 474         iounmap(base);
 475         return 0;
 476 }
 477
 478 static Scsi_Host_Template driver_template = {
 479         .name                           = "DTC 3180/3280 ",
 480         .detect                         = dtc_detect,
 481         .release                        = dtc_release,
 482         .queuecommand                   = dtc_queue_command,
 483         .eh_abort_handler               = dtc_abort,
 484         .eh_bus_reset_handler           = dtc_bus_reset,
 485         .eh_device_reset_handler        = dtc_device_reset,
 486         .eh_host_reset_handler          = dtc_host_reset,
 487         .bios_param                     = dtc_biosparam,
 488         .can_queue                      = CAN_QUEUE,
 489         .this_id                        = 7,
 490         .sg_tablesize                   = SG_ALL,
 491         .cmd_per_lun                    = CMD_PER_LUN,
 492         .use_clustering                 = DISABLE_CLUSTERING,
 493 };
 494 #include "scsi_module.c"