drivers/scsi/mac_scsi.c

   1 /*
   2  * Generic Macintosh NCR5380 driver
   3  *
   4  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
   5  *
   6  * derived in part from:
   7  */
   8 /*
   9  * Generic Generic NCR5380 driver
  10  *
  11  * Copyright 1995, Russell King
  12  *
  13  * ALPHA RELEASE 1.
  14  *
  15  * For more information, please consult
  16  *
  17  * NCR 5380 Family
  18  * SCSI Protocol Controller
  19  * Databook
  20  *
  21  * NCR Microelectronics
  22  * 1635 Aeroplaza Drive
  23  * Colorado Springs, CO 80916
  24  * 1+ (719) 578-3400
  25  * 1+ (800) 334-5454
  26  */
  27
  28 /*
  29  * $Log: mac_NCR5380.c,v $
  30  */
  31
  32 #include <linux/types.h>
  33 #include <linux/stddef.h>
  34 #include <linux/ctype.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/module.h>
  38 #include <linux/signal.h>
  39 #include <linux/ioport.h>
  40 #include <linux/init.h>
  41 #include <linux/blkdev.h>
  42 #include <linux/interrupt.h>
  43
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46
  47 #include <asm/macintosh.h>
  48 #include <asm/macints.h>
  49 #include <asm/mac_via.h>
  50
  51 #include "scsi.h"
  52 #include <scsi/scsi_host.h>
  53 #include "mac_scsi.h"
  54
  55 /* These control the behaviour of the generic 5380 core */
  56 #define AUTOSENSE
  57 #define PSEUDO_DMA
  58
  59 #include "NCR5380.h"
  60
  61 #if 0
  62 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
  63 #else
  64 #define NDEBUG (NDEBUG_ABORT)
  65 #endif
  66
  67 #define RESET_BOOT
  68 #define DRIVER_SETUP
  69
  70 extern void via_scsi_clear(void);
  71
  72 #ifdef RESET_BOOT
  73 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
  74 #endif
  75
  76 static int setup_called = 0;
  77 static int setup_can_queue = -1;
  78 static int setup_cmd_per_lun = -1;
  79 static int setup_sg_tablesize = -1;
  80 static int setup_use_pdma = -1;
  81 #ifdef SUPPORT_TAGS
  82 static int setup_use_tagged_queuing = -1;
  83 #endif
  84 static int setup_hostid = -1;
  85
  86 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
  87  * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
  88  * need ten times the standard value... */
  89 #define TOSHIBA_DELAY
  90
  91 #ifdef TOSHIBA_DELAY
  92 #define AFTER_RESET_DELAY       (5*HZ/2)
  93 #else
  94 #define AFTER_RESET_DELAY       (HZ/2)
  95 #endif
  96
  97 static volatile unsigned char *mac_scsi_regp = NULL;
  98 static volatile unsigned char *mac_scsi_drq  = NULL;
  99 static volatile unsigned char *mac_scsi_nodrq = NULL;
 100
 101
 102 /*
 103  * NCR 5380 register access functions
 104  */
 105
 106 #if 0
 107 /* Debug versions */
 108 #define CTRL(p,v) (*ctrl = (v))
 109
 110 static char macscsi_read(struct Scsi_Host *instance, int reg)
 111 {
 112   int iobase = instance->io_port;
 113   int i;
 114   int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
 115
 116   CTRL(iobase, 0);
 117   i = in_8(iobase + (reg<<4));
 118   CTRL(iobase, 0x40);
 119
 120   return i;
 121 }
 122
 123 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 124 {
 125   int iobase = instance->io_port;
 126   int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
 127
 128   CTRL(iobase, 0);
 129   out_8(iobase + (reg<<4), value);
 130   CTRL(iobase, 0x40);
 131 }
 132 #else
 133
 134 /* Fast versions */
 135 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
 136 {
 137   return in_8(instance->io_port + (reg<<4));
 138 }
 139
 140 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 141 {
 142   out_8(instance->io_port + (reg<<4), value);
 143 }
 144 #endif
 145
 146
 147 /*
 148  * Function : mac_scsi_setup(char *str)
 149  *
 150  * Purpose : booter command line initialization of the overrides array,
 151  *
 152  * Inputs : str - comma delimited list of options
 153  *
 154  */
 155
 156 static int __init mac_scsi_setup(char *str) {
 157 #ifdef DRIVER_SETUP
 158         int ints[7];
 159
 160         (void)get_options( str, ARRAY_SIZE(ints), ints);
 161
 162         if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
 163             printk(KERN_WARNING "scsi: <mac5380>"
 164                 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
 165             printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
 166             return 0;
 167         }
 168
 169         if (ints[0] >= 1) {
 170                 if (ints[1] > 0)
 171                         /* no limits on this, just > 0 */
 172                         setup_can_queue = ints[1];
 173         }
 174         if (ints[0] >= 2) {
 175                 if (ints[2] > 0)
 176                         setup_cmd_per_lun = ints[2];
 177         }
 178         if (ints[0] >= 3) {
 179                 if (ints[3] >= 0) {
 180                         setup_sg_tablesize = ints[3];
 181                         /* Must be <= SG_ALL (255) */
 182                         if (setup_sg_tablesize > SG_ALL)
 183                                 setup_sg_tablesize = SG_ALL;
 184                 }
 185         }
 186         if (ints[0] >= 4) {
 187                 /* Must be between 0 and 7 */
 188                 if (ints[4] >= 0 && ints[4] <= 7)
 189                         setup_hostid = ints[4];
 190                 else if (ints[4] > 7)
 191                         printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
 192         }
 193 #ifdef SUPPORT_TAGS
 194         if (ints[0] >= 5) {
 195                 if (ints[5] >= 0)
 196                         setup_use_tagged_queuing = !!ints[5];
 197         }
 198
 199         if (ints[0] == 6) {
 200             if (ints[6] >= 0)
 201                 setup_use_pdma = ints[6];
 202         }
 203 #else
 204         if (ints[0] == 5) {
 205             if (ints[5] >= 0)
 206                 setup_use_pdma = ints[5];
 207         }
 208 #endif /* SUPPORT_TAGS */
 209
 210 #endif /* DRIVER_SETUP */
 211         return 1;
 212 }
 213
 214 __setup("mac5380=", mac_scsi_setup);
 215
 216 /*
 217  * Function : int macscsi_detect(struct scsi_host_template * tpnt)
 218  *
 219  * Purpose : initializes mac NCR5380 driver based on the
 220  *      command line / compile time port and irq definitions.
 221  *
 222  * Inputs : tpnt - template for this SCSI adapter.
 223  *
 224  * Returns : 1 if a host adapter was found, 0 if not.
 225  *
 226  */
 227
 228 int __init macscsi_detect(struct scsi_host_template * tpnt)
 229 {
 230     static int called = 0;
 231     int flags = 0;
 232     struct Scsi_Host *instance;
 233
 234     if (!MACH_IS_MAC || called)
 235         return( 0 );
 236
 237     if (macintosh_config->scsi_type != MAC_SCSI_OLD)
 238         return( 0 );
 239
 240     /* setup variables */
 241     tpnt->can_queue =
 242         (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 243     tpnt->cmd_per_lun =
 244         (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 245     tpnt->sg_tablesize =
 246         (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 247
 248     if (setup_hostid >= 0)
 249         tpnt->this_id = setup_hostid;
 250     else {
 251         /* use 7 as default */
 252         tpnt->this_id = 7;
 253     }
 254
 255 #ifdef SUPPORT_TAGS
 256     if (setup_use_tagged_queuing < 0)
 257         setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 258 #endif
 259
 260     /* Once we support multiple 5380s (e.g. DuoDock) we'll do
 261        something different here */
 262     instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 263     if (instance == NULL)
 264         return 0;
 265
 266     if (macintosh_config->ident == MAC_MODEL_IIFX) {
 267         mac_scsi_regp  = via1+0x8000;
 268         mac_scsi_drq   = via1+0xE000;
 269         mac_scsi_nodrq = via1+0xC000;
 270         /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
 271         flags = FLAG_NO_PSEUDO_DMA;
 272     } else {
 273         mac_scsi_regp  = via1+0x10000;
 274         mac_scsi_drq   = via1+0x6000;
 275         mac_scsi_nodrq = via1+0x12000;
 276     }
 277
 278     if (! setup_use_pdma)
 279         flags = FLAG_NO_PSEUDO_DMA;
 280
 281     instance->io_port = (unsigned long) mac_scsi_regp;
 282     instance->irq = IRQ_MAC_SCSI;
 283
 284 #ifdef RESET_BOOT
 285     mac_scsi_reset_boot(instance);
 286 #endif
 287
 288     NCR5380_init(instance, flags);
 289
 290     instance->n_io_port = 255;
 291
 292     ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 293
 294     if (instance->irq != SCSI_IRQ_NONE)
 295         if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
 296             printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
 297                    instance->host_no, instance->irq);
 298             instance->irq = SCSI_IRQ_NONE;
 299         }
 300
 301     printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
 302     if (instance->irq == SCSI_IRQ_NONE)
 303         printk (KERN_INFO "s disabled");
 304     else
 305         printk (KERN_INFO " %d", instance->irq);
 306     printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 307            instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
 308     printk(KERN_INFO "\nscsi%d:", instance->host_no);
 309     NCR5380_print_options(instance);
 310     printk("\n");
 311     called = 1;
 312     return 1;
 313 }
 314
 315 int macscsi_release (struct Scsi_Host *shpnt)
 316 {
 317         if (shpnt->irq != SCSI_IRQ_NONE)
 318                 free_irq(shpnt->irq, shpnt);
 319         NCR5380_exit(shpnt);
 320
 321         return 0;
 322 }
 323
 324 #ifdef RESET_BOOT
 325 /*
 326  * Our 'bus reset on boot' function
 327  */
 328
 329 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
 330 {
 331         unsigned long end;
 332
 333         NCR5380_local_declare();
 334         NCR5380_setup(instance);
 335
 336         /*
 337          * Do a SCSI reset to clean up the bus during initialization. No messing
 338          * with the queues, interrupts, or locks necessary here.
 339          */
 340
 341         printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
 342
 343         /* get in phase */
 344         NCR5380_write( TARGET_COMMAND_REG,
 345                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 346
 347         /* assert RST */
 348         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 349         /* The min. reset hold time is 25us, so 40us should be enough */
 350         udelay( 50 );
 351         /* reset RST and interrupt */
 352         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 353         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 354
 355         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 356                 barrier();
 357
 358         printk(KERN_INFO " done\n" );
 359 }
 360 #endif
 361
 362 const char * macscsi_info (struct Scsi_Host *spnt) {
 363         return "";
 364 }
 365
 366 /*
 367    Pseudo-DMA: (Ove Edlund)
 368    The code attempts to catch bus errors that occur if one for example
 369    "trips over the cable".
 370    XXX: Since bus errors in the PDMA routines never happen on my
 371    computer, the bus error code is untested.
 372    If the code works as intended, a bus error results in Pseudo-DMA
 373    beeing disabled, meaning that the driver switches to slow handshake.
 374    If bus errors are NOT extremely rare, this has to be changed.
 375 */
 376
 377 #define CP_IO_TO_MEM(s,d,len)                           \
 378 __asm__ __volatile__                                    \
 379     ("    cmp.w  #4,%2\n"                               \
 380      "    bls    8f\n"                                  \
 381      "    move.w %1,%%d0\n"                             \
 382      "    neg.b  %%d0\n"                                \
 383      "    and.w  #3,%%d0\n"                             \
 384      "    sub.w  %%d0,%2\n"                             \
 385      "    bra    2f\n"                                  \
 386      " 1: move.b (%0),(%1)+\n"                          \
 387      " 2: dbf    %%d0,1b\n"                             \
 388      "    move.w %2,%%d0\n"                             \
 389      "    lsr.w  #5,%%d0\n"                             \
 390      "    bra    4f\n"                                  \
 391      " 3: move.l (%0),(%1)+\n"                          \
 392      "31: move.l (%0),(%1)+\n"                          \
 393      "32: move.l (%0),(%1)+\n"                          \
 394      "33: move.l (%0),(%1)+\n"                          \
 395      "34: move.l (%0),(%1)+\n"                          \
 396      "35: move.l (%0),(%1)+\n"                          \
 397      "36: move.l (%0),(%1)+\n"                          \
 398      "37: move.l (%0),(%1)+\n"                          \
 399      " 4: dbf    %%d0,3b\n"                             \
 400      "    move.w %2,%%d0\n"                             \
 401      "    lsr.w  #2,%%d0\n"                             \
 402      "    and.w  #7,%%d0\n"                             \
 403      "    bra    6f\n"                                  \
 404      " 5: move.l (%0),(%1)+\n"                          \
 405      " 6: dbf    %%d0,5b\n"                             \
 406      "    and.w  #3,%2\n"                               \
 407      "    bra    8f\n"                                  \
 408      " 7: move.b (%0),(%1)+\n"                          \
 409      " 8: dbf    %2,7b\n"                               \
 410      "    moveq.l #0, %2\n"                             \
 411      " 9: \n"                                           \
 412      ".section .fixup,\"ax\"\n"                         \
 413      "    .even\n"                                      \
 414      "90: moveq.l #1, %2\n"                             \
 415      "    jra 9b\n"                                     \
 416      ".previous\n"                                      \
 417      ".section __ex_table,\"a\"\n"                      \
 418      "   .align 4\n"                                    \
 419      "   .long  1b,90b\n"                               \
 420      "   .long  3b,90b\n"                               \
 421      "   .long 31b,90b\n"                               \
 422      "   .long 32b,90b\n"                               \
 423      "   .long 33b,90b\n"                               \
 424      "   .long 34b,90b\n"                               \
 425      "   .long 35b,90b\n"                               \
 426      "   .long 36b,90b\n"                               \
 427      "   .long 37b,90b\n"                               \
 428      "   .long  5b,90b\n"                               \
 429      "   .long  7b,90b\n"                               \
 430      ".previous"                                        \
 431      : "=a"(s), "=a"(d), "=d"(len)                      \
 432      : "0"(s), "1"(d), "2"(len)                         \
 433      : "d0")
 434
 435
 436 static int macscsi_pread (struct Scsi_Host *instance,
 437                           unsigned char *dst, int len)
 438 {
 439    unsigned char *d;
 440    volatile unsigned char *s;
 441
 442    NCR5380_local_declare();
 443    NCR5380_setup(instance);
 444
 445    s = mac_scsi_drq+0x60;
 446    d = dst;
 447
 448 /* These conditions are derived from MacOS */
 449
 450    while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
 451          && !(NCR5380_read(STATUS_REG) & SR_REQ))
 452       ;
 453    if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
 454          && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
 455       printk(KERN_ERR "Error in macscsi_pread\n");
 456       return -1;
 457    }
 458
 459    CP_IO_TO_MEM(s, d, len);
 460
 461    if (len != 0) {
 462       printk(KERN_NOTICE "Bus error in macscsi_pread\n");
 463       return -1;
 464    }
 465
 466    return 0;
 467 }
 468
 469
 470 #define CP_MEM_TO_IO(s,d,len)                           \
 471 __asm__ __volatile__                                    \
 472     ("    cmp.w  #4,%2\n"                               \
 473      "    bls    8f\n"                                  \
 474      "    move.w %0,%%d0\n"                             \
 475      "    neg.b  %%d0\n"                                \
 476      "    and.w  #3,%%d0\n"                             \
 477      "    sub.w  %%d0,%2\n"                             \
 478      "    bra    2f\n"                                  \
 479      " 1: move.b (%0)+,(%1)\n"                          \
 480      " 2: dbf    %%d0,1b\n"                             \
 481      "    move.w %2,%%d0\n"                             \
 482      "    lsr.w  #5,%%d0\n"                             \
 483      "    bra    4f\n"                                  \
 484      " 3: move.l (%0)+,(%1)\n"                          \
 485      "31: move.l (%0)+,(%1)\n"                          \
 486      "32: move.l (%0)+,(%1)\n"                          \
 487      "33: move.l (%0)+,(%1)\n"                          \
 488      "34: move.l (%0)+,(%1)\n"                          \
 489      "35: move.l (%0)+,(%1)\n"                          \
 490      "36: move.l (%0)+,(%1)\n"                          \
 491      "37: move.l (%0)+,(%1)\n"                          \
 492      " 4: dbf    %%d0,3b\n"                             \
 493      "    move.w %2,%%d0\n"                             \
 494      "    lsr.w  #2,%%d0\n"                             \
 495      "    and.w  #7,%%d0\n"                             \
 496      "    bra    6f\n"                                  \
 497      " 5: move.l (%0)+,(%1)\n"                          \
 498      " 6: dbf    %%d0,5b\n"                             \
 499      "    and.w  #3,%2\n"                               \
 500      "    bra    8f\n"                                  \
 501      " 7: move.b (%0)+,(%1)\n"                          \
 502      " 8: dbf    %2,7b\n"                               \
 503      "    moveq.l #0, %2\n"                             \
 504      " 9: \n"                                           \
 505      ".section .fixup,\"ax\"\n"                         \
 506      "    .even\n"                                      \
 507      "90: moveq.l #1, %2\n"                             \
 508      "    jra 9b\n"                                     \
 509      ".previous\n"                                      \
 510      ".section __ex_table,\"a\"\n"                      \
 511      "   .align 4\n"                                    \
 512      "   .long  1b,90b\n"                               \
 513      "   .long  3b,90b\n"                               \
 514      "   .long 31b,90b\n"                               \
 515      "   .long 32b,90b\n"                               \
 516      "   .long 33b,90b\n"                               \
 517      "   .long 34b,90b\n"                               \
 518      "   .long 35b,90b\n"                               \
 519      "   .long 36b,90b\n"                               \
 520      "   .long 37b,90b\n"                               \
 521      "   .long  5b,90b\n"                               \
 522      "   .long  7b,90b\n"                               \
 523      ".previous"                                        \
 524      : "=a"(s), "=a"(d), "=d"(len)                      \
 525      : "0"(s), "1"(d), "2"(len)                         \
 526      : "d0")
 527
 528 static int macscsi_pwrite (struct Scsi_Host *instance,
 529                                   unsigned char *src, int len)
 530 {
 531    unsigned char *s;
 532    volatile unsigned char *d;
 533
 534    NCR5380_local_declare();
 535    NCR5380_setup(instance);
 536
 537    s = src;
 538    d = mac_scsi_drq;
 539
 540 /* These conditions are derived from MacOS */
 541
 542    while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
 543          && (!(NCR5380_read(STATUS_REG) & SR_REQ)
 544             || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
 545       ;
 546    if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
 547       printk(KERN_ERR "Error in macscsi_pwrite\n");
 548       return -1;
 549    }
 550
 551    CP_MEM_TO_IO(s, d, len);
 552
 553    if (len != 0) {
 554       printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
 555       return -1;
 556    }
 557
 558    return 0;
 559 }
 560
 561
 562 #include "NCR5380.c"
 563
 564 static struct scsi_host_template driver_template = {
 565         .proc_name                      = "Mac5380",
 566         .show_info                      = macscsi_show_info,
 567         .write_info                     = macscsi_write_info,
 568         .name                           = "Macintosh NCR5380 SCSI",
 569         .detect                         = macscsi_detect,
 570         .release                        = macscsi_release,
 571         .info                           = macscsi_info,
 572         .queuecommand                   = macscsi_queue_command,
 573         .eh_abort_handler               = macscsi_abort,
 574         .eh_bus_reset_handler           = macscsi_bus_reset,
 575         .can_queue                      = CAN_QUEUE,
 576         .this_id                        = 7,
 577         .sg_tablesize                   = SG_ALL,
 578         .cmd_per_lun                    = CMD_PER_LUN,
 579         .use_clustering                 = DISABLE_CLUSTERING
 580 };
 581
 582
 583 #include "scsi_module.c"