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