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 #include <asm/system.h>
  47
  48 #include <asm/macintosh.h>
  49 #include <asm/macints.h>
  50 #include <asm/machw.h>
  51 #include <asm/mac_via.h>
  52
  53 #include "scsi.h"
  54 #include <scsi/scsi_host.h>
  55 #include "mac_scsi.h"
  56
  57 /* These control the behaviour of the generic 5380 core */
  58 #define AUTOSENSE
  59 #define PSEUDO_DMA
  60
  61 #include "NCR5380.h"
  62
  63 #if 0
  64 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
  65 #else
  66 #define NDEBUG (NDEBUG_ABORT)
  67 #endif
  68
  69 #define RESET_BOOT
  70 #define DRIVER_SETUP
  71
  72 extern void via_scsi_clear(void);
  73
  74 #ifdef RESET_BOOT
  75 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
  76 #endif
  77
  78 static int setup_called = 0;
  79 static int setup_can_queue = -1;
  80 static int setup_cmd_per_lun = -1;
  81 static int setup_sg_tablesize = -1;
  82 static int setup_use_pdma = -1;
  83 #ifdef SUPPORT_TAGS
  84 static int setup_use_tagged_queuing = -1;
  85 #endif
  86 static int setup_hostid = -1;
  87
  88 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
  89  * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
  90  * need ten times the standard value... */
  91 #define TOSHIBA_DELAY
  92
  93 #ifdef TOSHIBA_DELAY
  94 #define AFTER_RESET_DELAY       (5*HZ/2)
  95 #else
  96 #define AFTER_RESET_DELAY       (HZ/2)
  97 #endif
  98
  99 static volatile unsigned char *mac_scsi_regp = NULL;
 100 static volatile unsigned char *mac_scsi_drq  = NULL;
 101 static volatile unsigned char *mac_scsi_nodrq = NULL;
 102
 103
 104 /*
 105  * NCR 5380 register access functions
 106  */
 107
 108 #if 0
 109 /* Debug versions */
 110 #define CTRL(p,v) (*ctrl = (v))
 111
 112 static char macscsi_read(struct Scsi_Host *instance, int reg)
 113 {
 114   int iobase = instance->io_port;
 115   int i;
 116   int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
 117
 118   CTRL(iobase, 0);
 119   i = in_8(iobase + (reg<<4));
 120   CTRL(iobase, 0x40);
 121
 122   return i;
 123 }
 124
 125 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 126 {
 127   int iobase = instance->io_port;
 128   int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;
 129
 130   CTRL(iobase, 0);
 131   out_8(iobase + (reg<<4), value);
 132   CTRL(iobase, 0x40);
 133 }
 134 #else
 135
 136 /* Fast versions */
 137 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
 138 {
 139   return in_8(instance->io_port + (reg<<4));
 140 }
 141
 142 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 143 {
 144   out_8(instance->io_port + (reg<<4), value);
 145 }
 146 #endif
 147
 148
 149 /*
 150  * Function : mac_scsi_setup(char *str)
 151  *
 152  * Purpose : booter command line initialization of the overrides array,
 153  *
 154  * Inputs : str - comma delimited list of options
 155  *
 156  */
 157
 158 static int __init mac_scsi_setup(char *str) {
 159 #ifdef DRIVER_SETUP
 160         int ints[7];
 161
 162         (void)get_options( str, ARRAY_SIZE(ints), ints);
 163
 164         if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
 165             printk(KERN_WARNING "scsi: <mac5380>"
 166                 " Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
 167             printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
 168             return 0;
 169         }
 170
 171         if (ints[0] >= 1) {
 172                 if (ints[1] > 0)
 173                         /* no limits on this, just > 0 */
 174                         setup_can_queue = ints[1];
 175         }
 176         if (ints[0] >= 2) {
 177                 if (ints[2] > 0)
 178                         setup_cmd_per_lun = ints[2];
 179         }
 180         if (ints[0] >= 3) {
 181                 if (ints[3] >= 0) {
 182                         setup_sg_tablesize = ints[3];
 183                         /* Must be <= SG_ALL (255) */
 184                         if (setup_sg_tablesize > SG_ALL)
 185                                 setup_sg_tablesize = SG_ALL;
 186                 }
 187         }
 188         if (ints[0] >= 4) {
 189                 /* Must be between 0 and 7 */
 190                 if (ints[4] >= 0 && ints[4] <= 7)
 191                         setup_hostid = ints[4];
 192                 else if (ints[4] > 7)
 193                         printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
 194         }
 195 #ifdef SUPPORT_TAGS
 196         if (ints[0] >= 5) {
 197                 if (ints[5] >= 0)
 198                         setup_use_tagged_queuing = !!ints[5];
 199         }
 200
 201         if (ints[0] == 6) {
 202             if (ints[6] >= 0)
 203                 setup_use_pdma = ints[6];
 204         }
 205 #else
 206         if (ints[0] == 5) {
 207             if (ints[5] >= 0)
 208                 setup_use_pdma = ints[5];
 209         }
 210 #endif /* SUPPORT_TAGS */
 211
 212 #endif /* DRIVER_SETUP */
 213         return 1;
 214 }
 215
 216 __setup("mac5380=", mac_scsi_setup);
 217
 218 /*
 219  * If you want to find the instance with (k)gdb ...
 220  */
 221 #if NDEBUG
 222 static struct Scsi_Host *default_instance;
 223 #endif
 224
 225 /*
 226  * Function : int macscsi_detect(struct scsi_host_template * tpnt)
 227  *
 228  * Purpose : initializes mac NCR5380 driver based on the
 229  *      command line / compile time port and irq definitions.
 230  *
 231  * Inputs : tpnt - template for this SCSI adapter.
 232  *
 233  * Returns : 1 if a host adapter was found, 0 if not.
 234  *
 235  */
 236
 237 int macscsi_detect(struct scsi_host_template * tpnt)
 238 {
 239     static int called = 0;
 240     int flags = 0;
 241     struct Scsi_Host *instance;
 242
 243     if (!MACH_IS_MAC || called)
 244         return( 0 );
 245
 246     if (macintosh_config->scsi_type != MAC_SCSI_OLD)
 247         return( 0 );
 248
 249     /* setup variables */
 250     tpnt->can_queue =
 251         (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
 252     tpnt->cmd_per_lun =
 253         (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
 254     tpnt->sg_tablesize =
 255         (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
 256
 257     if (setup_hostid >= 0)
 258         tpnt->this_id = setup_hostid;
 259     else {
 260         /* use 7 as default */
 261         tpnt->this_id = 7;
 262     }
 263
 264 #ifdef SUPPORT_TAGS
 265     if (setup_use_tagged_queuing < 0)
 266         setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 267 #endif
 268
 269     /* Once we support multiple 5380s (e.g. DuoDock) we'll do
 270        something different here */
 271     instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 272 #if NDEBUG
 273     default_instance = instance;
 274 #endif
 275
 276     if (macintosh_config->ident == MAC_MODEL_IIFX) {
 277         mac_scsi_regp  = via1+0x8000;
 278         mac_scsi_drq   = via1+0xE000;
 279         mac_scsi_nodrq = via1+0xC000;
 280         /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
 281         flags = FLAG_NO_PSEUDO_DMA;
 282     } else {
 283         mac_scsi_regp  = via1+0x10000;
 284         mac_scsi_drq   = via1+0x6000;
 285         mac_scsi_nodrq = via1+0x12000;
 286     }
 287
 288     if (! setup_use_pdma)
 289         flags = FLAG_NO_PSEUDO_DMA;
 290
 291     instance->io_port = (unsigned long) mac_scsi_regp;
 292     instance->irq = IRQ_MAC_SCSI;
 293
 294 #ifdef RESET_BOOT
 295     mac_scsi_reset_boot(instance);
 296 #endif
 297
 298     NCR5380_init(instance, flags);
 299
 300     instance->n_io_port = 255;
 301
 302     ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 303
 304     if (instance->irq != SCSI_IRQ_NONE)
 305         if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
 306                         "ncr5380", instance)) {
 307             printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
 308                    instance->host_no, instance->irq);
 309             instance->irq = SCSI_IRQ_NONE;
 310         }
 311
 312     printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
 313     if (instance->irq == SCSI_IRQ_NONE)
 314         printk (KERN_INFO "s disabled");
 315     else
 316         printk (KERN_INFO " %d", instance->irq);
 317     printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 318            instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
 319     printk(KERN_INFO "\nscsi%d:", instance->host_no);
 320     NCR5380_print_options(instance);
 321     printk("\n");
 322     called = 1;
 323     return 1;
 324 }
 325
 326 int macscsi_release (struct Scsi_Host *shpnt)
 327 {
 328         if (shpnt->irq != SCSI_IRQ_NONE)
 329                 free_irq(shpnt->irq, shpnt);
 330         NCR5380_exit(shpnt);
 331
 332         return 0;
 333 }
 334
 335 #ifdef RESET_BOOT
 336 /*
 337  * Our 'bus reset on boot' function
 338  */
 339
 340 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
 341 {
 342         unsigned long end;
 343
 344         NCR5380_local_declare();
 345         NCR5380_setup(instance);
 346
 347         /*
 348          * Do a SCSI reset to clean up the bus during initialization. No messing
 349          * with the queues, interrupts, or locks necessary here.
 350          */
 351
 352         printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
 353
 354         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 355         disable_irq(IRQ_MAC_SCSI);
 356
 357         /* get in phase */
 358         NCR5380_write( TARGET_COMMAND_REG,
 359                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 360
 361         /* assert RST */
 362         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 363         /* The min. reset hold time is 25us, so 40us should be enough */
 364         udelay( 50 );
 365         /* reset RST and interrupt */
 366         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 367         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 368
 369         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 370                 barrier();
 371
 372         /* switch on SCSI IRQ again */
 373         enable_irq(IRQ_MAC_SCSI);
 374
 375         printk(KERN_INFO " done\n" );
 376 }
 377 #endif
 378
 379 const char * macscsi_info (struct Scsi_Host *spnt) {
 380         return "";
 381 }
 382
 383 /*
 384    Pseudo-DMA: (Ove Edlund)
 385    The code attempts to catch bus errors that occur if one for example
 386    "trips over the cable".
 387    XXX: Since bus errors in the PDMA routines never happen on my
 388    computer, the bus error code is untested.
 389    If the code works as intended, a bus error results in Pseudo-DMA
 390    beeing disabled, meaning that the driver switches to slow handshake.
 391    If bus errors are NOT extremely rare, this has to be changed.
 392 */
 393
 394 #define CP_IO_TO_MEM(s,d,len)                           \
 395 __asm__ __volatile__                                    \
 396     ("    cmp.w  #4,%2\n"                               \
 397      "    bls    8f\n"                                  \
 398      "    move.w %1,%%d0\n"                             \
 399      "    neg.b  %%d0\n"                                \
 400      "    and.w  #3,%%d0\n"                             \
 401      "    sub.w  %%d0,%2\n"                             \
 402      "    bra    2f\n"                                  \
 403      " 1: move.b (%0),(%1)+\n"                          \
 404      " 2: dbf    %%d0,1b\n"                             \
 405      "    move.w %2,%%d0\n"                             \
 406      "    lsr.w  #5,%%d0\n"                             \
 407      "    bra    4f\n"                                  \
 408      " 3: move.l (%0),(%1)+\n"                          \
 409      "31: move.l (%0),(%1)+\n"                          \
 410      "32: move.l (%0),(%1)+\n"                          \
 411      "33: move.l (%0),(%1)+\n"                          \
 412      "34: move.l (%0),(%1)+\n"                          \
 413      "35: move.l (%0),(%1)+\n"                          \
 414      "36: move.l (%0),(%1)+\n"                          \
 415      "37: move.l (%0),(%1)+\n"                          \
 416      " 4: dbf    %%d0,3b\n"                             \
 417      "    move.w %2,%%d0\n"                             \
 418      "    lsr.w  #2,%%d0\n"                             \
 419      "    and.w  #7,%%d0\n"                             \
 420      "    bra    6f\n"                                  \
 421      " 5: move.l (%0),(%1)+\n"                          \
 422      " 6: dbf    %%d0,5b\n"                             \
 423      "    and.w  #3,%2\n"                               \
 424      "    bra    8f\n"                                  \
 425      " 7: move.b (%0),(%1)+\n"                          \
 426      " 8: dbf    %2,7b\n"                               \
 427      "    moveq.l #0, %2\n"                             \
 428      " 9: \n"                                           \
 429      ".section .fixup,\"ax\"\n"                         \
 430      "    .even\n"                                      \
 431      "90: moveq.l #1, %2\n"                             \
 432      "    jra 9b\n"                                     \
 433      ".previous\n"                                      \
 434      ".section __ex_table,\"a\"\n"                      \
 435      "   .align 4\n"                                    \
 436      "   .long  1b,90b\n"                               \
 437      "   .long  3b,90b\n"                               \
 438      "   .long 31b,90b\n"                               \
 439      "   .long 32b,90b\n"                               \
 440      "   .long 33b,90b\n"                               \
 441      "   .long 34b,90b\n"                               \
 442      "   .long 35b,90b\n"                               \
 443      "   .long 36b,90b\n"                               \
 444      "   .long 37b,90b\n"                               \
 445      "   .long  5b,90b\n"                               \
 446      "   .long  7b,90b\n"                               \
 447      ".previous"                                        \
 448      : "=a"(s), "=a"(d), "=d"(len)                      \
 449      : "0"(s), "1"(d), "2"(len)                         \
 450      : "d0")
 451
 452
 453 static int macscsi_pread (struct Scsi_Host *instance,
 454                           unsigned char *dst, int len)
 455 {
 456    unsigned char *d;
 457    volatile unsigned char *s;
 458
 459    NCR5380_local_declare();
 460    NCR5380_setup(instance);
 461
 462    s = mac_scsi_drq+0x60;
 463    d = dst;
 464
 465 /* These conditions are derived from MacOS */
 466
 467    while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
 468          && !(NCR5380_read(STATUS_REG) & SR_REQ))
 469       ;
 470    if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
 471          && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
 472       printk(KERN_ERR "Error in macscsi_pread\n");
 473       return -1;
 474    }
 475
 476    CP_IO_TO_MEM(s, d, len);
 477
 478    if (len != 0) {
 479       printk(KERN_NOTICE "Bus error in macscsi_pread\n");
 480       return -1;
 481    }
 482
 483    return 0;
 484 }
 485
 486
 487 #define CP_MEM_TO_IO(s,d,len)                           \
 488 __asm__ __volatile__                                    \
 489     ("    cmp.w  #4,%2\n"                               \
 490      "    bls    8f\n"                                  \
 491      "    move.w %0,%%d0\n"                             \
 492      "    neg.b  %%d0\n"                                \
 493      "    and.w  #3,%%d0\n"                             \
 494      "    sub.w  %%d0,%2\n"                             \
 495      "    bra    2f\n"                                  \
 496      " 1: move.b (%0)+,(%1)\n"                          \
 497      " 2: dbf    %%d0,1b\n"                             \
 498      "    move.w %2,%%d0\n"                             \
 499      "    lsr.w  #5,%%d0\n"                             \
 500      "    bra    4f\n"                                  \
 501      " 3: move.l (%0)+,(%1)\n"                          \
 502      "31: move.l (%0)+,(%1)\n"                          \
 503      "32: move.l (%0)+,(%1)\n"                          \
 504      "33: move.l (%0)+,(%1)\n"                          \
 505      "34: move.l (%0)+,(%1)\n"                          \
 506      "35: move.l (%0)+,(%1)\n"                          \
 507      "36: move.l (%0)+,(%1)\n"                          \
 508      "37: move.l (%0)+,(%1)\n"                          \
 509      " 4: dbf    %%d0,3b\n"                             \
 510      "    move.w %2,%%d0\n"                             \
 511      "    lsr.w  #2,%%d0\n"                             \
 512      "    and.w  #7,%%d0\n"                             \
 513      "    bra    6f\n"                                  \
 514      " 5: move.l (%0)+,(%1)\n"                          \
 515      " 6: dbf    %%d0,5b\n"                             \
 516      "    and.w  #3,%2\n"                               \
 517      "    bra    8f\n"                                  \
 518      " 7: move.b (%0)+,(%1)\n"                          \
 519      " 8: dbf    %2,7b\n"                               \
 520      "    moveq.l #0, %2\n"                             \
 521      " 9: \n"                                           \
 522      ".section .fixup,\"ax\"\n"                         \
 523      "    .even\n"                                      \
 524      "90: moveq.l #1, %2\n"                             \
 525      "    jra 9b\n"                                     \
 526      ".previous\n"                                      \
 527      ".section __ex_table,\"a\"\n"                      \
 528      "   .align 4\n"                                    \
 529      "   .long  1b,90b\n"                               \
 530      "   .long  3b,90b\n"                               \
 531      "   .long 31b,90b\n"                               \
 532      "   .long 32b,90b\n"                               \
 533      "   .long 33b,90b\n"                               \
 534      "   .long 34b,90b\n"                               \
 535      "   .long 35b,90b\n"                               \
 536      "   .long 36b,90b\n"                               \
 537      "   .long 37b,90b\n"                               \
 538      "   .long  5b,90b\n"                               \
 539      "   .long  7b,90b\n"                               \
 540      ".previous"                                        \
 541      : "=a"(s), "=a"(d), "=d"(len)                      \
 542      : "0"(s), "1"(d), "2"(len)                         \
 543      : "d0")
 544
 545 static int macscsi_pwrite (struct Scsi_Host *instance,
 546                                   unsigned char *src, int len)
 547 {
 548    unsigned char *s;
 549    volatile unsigned char *d;
 550
 551    NCR5380_local_declare();
 552    NCR5380_setup(instance);
 553
 554    s = src;
 555    d = mac_scsi_drq;
 556
 557 /* These conditions are derived from MacOS */
 558
 559    while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)
 560          && (!(NCR5380_read(STATUS_REG) & SR_REQ)
 561             || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
 562       ;
 563    if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
 564       printk(KERN_ERR "Error in macscsi_pwrite\n");
 565       return -1;
 566    }
 567
 568    CP_MEM_TO_IO(s, d, len);
 569
 570    if (len != 0) {
 571       printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
 572       return -1;
 573    }
 574
 575    return 0;
 576 }
 577
 578
 579 #include "NCR5380.c"
 580
 581 static struct scsi_host_template driver_template = {
 582         .proc_name                      = "Mac5380",
 583         .proc_info                      = macscsi_proc_info,
 584         .name                           = "Macintosh NCR5380 SCSI",
 585         .detect                         = macscsi_detect,
 586         .release                        = macscsi_release,
 587         .info                           = macscsi_info,
 588         .queuecommand                   = macscsi_queue_command,
 589         .eh_abort_handler               = macscsi_abort,
 590         .eh_bus_reset_handler           = macscsi_bus_reset,
 591         .can_queue                      = CAN_QUEUE,
 592         .this_id                        = 7,
 593         .sg_tablesize                   = SG_ALL,
 594         .cmd_per_lun                    = CMD_PER_LUN,
 595         .use_clustering                 = DISABLE_CLUSTERING
 596 };
 597
 598
 599 #include "scsi_module.c"