linux/drivers/scsi/mac_scsi.c
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   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
  70extern void via_scsi_clear(void);
  71
  72#ifdef RESET_BOOT
  73static void mac_scsi_reset_boot(struct Scsi_Host *instance);
  74#endif
  75
  76static int setup_called = 0;
  77static int setup_can_queue = -1;
  78static int setup_cmd_per_lun = -1;
  79static int setup_sg_tablesize = -1;
  80static int setup_use_pdma = -1;
  81#ifdef SUPPORT_TAGS
  82static int setup_use_tagged_queuing = -1;
  83#endif
  84static 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
  97static volatile unsigned char *mac_scsi_regp = NULL;
  98static volatile unsigned char *mac_scsi_drq  = NULL;
  99static 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
 110static 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
 123static 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 */
 135static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
 136{
 137  return in_8(instance->io_port + (reg<<4));
 138}
 139
 140static __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
 156static 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 
 228int __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
 264    if (macintosh_config->ident == MAC_MODEL_IIFX) {
 265        mac_scsi_regp  = via1+0x8000;
 266        mac_scsi_drq   = via1+0xE000;
 267        mac_scsi_nodrq = via1+0xC000;
 268        /* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
 269        flags = FLAG_NO_PSEUDO_DMA;
 270    } else {
 271        mac_scsi_regp  = via1+0x10000;
 272        mac_scsi_drq   = via1+0x6000;
 273        mac_scsi_nodrq = via1+0x12000;
 274    }
 275
 276    if (! setup_use_pdma)
 277        flags = FLAG_NO_PSEUDO_DMA;
 278        
 279    instance->io_port = (unsigned long) mac_scsi_regp;
 280    instance->irq = IRQ_MAC_SCSI;
 281
 282#ifdef RESET_BOOT   
 283    mac_scsi_reset_boot(instance);
 284#endif
 285    
 286    NCR5380_init(instance, flags);
 287
 288    instance->n_io_port = 255;
 289
 290    ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
 291
 292    if (instance->irq != SCSI_IRQ_NONE)
 293        if (request_irq(instance->irq, NCR5380_intr, 0, "ncr5380", instance)) {
 294            printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
 295                   instance->host_no, instance->irq);
 296            instance->irq = SCSI_IRQ_NONE;
 297        }
 298
 299    printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
 300    if (instance->irq == SCSI_IRQ_NONE)
 301        printk (KERN_INFO "s disabled");
 302    else
 303        printk (KERN_INFO " %d", instance->irq);
 304    printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 305           instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
 306    printk(KERN_INFO "\nscsi%d:", instance->host_no);
 307    NCR5380_print_options(instance);
 308    printk("\n");
 309    called = 1;
 310    return 1;
 311}
 312
 313int macscsi_release (struct Scsi_Host *shpnt)
 314{
 315        if (shpnt->irq != SCSI_IRQ_NONE)
 316                free_irq(shpnt->irq, shpnt);
 317        NCR5380_exit(shpnt);
 318
 319        return 0;
 320}
 321
 322#ifdef RESET_BOOT
 323/*
 324 * Our 'bus reset on boot' function
 325 */
 326
 327static void mac_scsi_reset_boot(struct Scsi_Host *instance)
 328{
 329        unsigned long end;
 330
 331        NCR5380_local_declare();
 332        NCR5380_setup(instance);
 333        
 334        /*
 335         * Do a SCSI reset to clean up the bus during initialization. No messing
 336         * with the queues, interrupts, or locks necessary here.
 337         */
 338
 339        printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
 340
 341        /* get in phase */
 342        NCR5380_write( TARGET_COMMAND_REG,
 343                      PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
 344
 345        /* assert RST */
 346        NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 347        /* The min. reset hold time is 25us, so 40us should be enough */
 348        udelay( 50 );
 349        /* reset RST and interrupt */
 350        NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 351        NCR5380_read( RESET_PARITY_INTERRUPT_REG );
 352
 353        for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 354                barrier();
 355
 356        printk(KERN_INFO " done\n" );
 357}
 358#endif
 359
 360const char * macscsi_info (struct Scsi_Host *spnt) {
 361        return "";
 362}
 363
 364/* 
 365   Pseudo-DMA: (Ove Edlund)
 366   The code attempts to catch bus errors that occur if one for example
 367   "trips over the cable".
 368   XXX: Since bus errors in the PDMA routines never happen on my 
 369   computer, the bus error code is untested. 
 370   If the code works as intended, a bus error results in Pseudo-DMA 
 371   beeing disabled, meaning that the driver switches to slow handshake. 
 372   If bus errors are NOT extremely rare, this has to be changed. 
 373*/
 374
 375#define CP_IO_TO_MEM(s,d,len)                           \
 376__asm__ __volatile__                                    \
 377    ("    cmp.w  #4,%2\n"                               \
 378     "    bls    8f\n"                                  \
 379     "    move.w %1,%%d0\n"                             \
 380     "    neg.b  %%d0\n"                                \
 381     "    and.w  #3,%%d0\n"                             \
 382     "    sub.w  %%d0,%2\n"                             \
 383     "    bra    2f\n"                                  \
 384     " 1: move.b (%0),(%1)+\n"                          \
 385     " 2: dbf    %%d0,1b\n"                             \
 386     "    move.w %2,%%d0\n"                             \
 387     "    lsr.w  #5,%%d0\n"                             \
 388     "    bra    4f\n"                                  \
 389     " 3: move.l (%0),(%1)+\n"                          \
 390     "31: move.l (%0),(%1)+\n"                          \
 391     "32: move.l (%0),(%1)+\n"                          \
 392     "33: move.l (%0),(%1)+\n"                          \
 393     "34: move.l (%0),(%1)+\n"                          \
 394     "35: move.l (%0),(%1)+\n"                          \
 395     "36: move.l (%0),(%1)+\n"                          \
 396     "37: move.l (%0),(%1)+\n"                          \
 397     " 4: dbf    %%d0,3b\n"                             \
 398     "    move.w %2,%%d0\n"                             \
 399     "    lsr.w  #2,%%d0\n"                             \
 400     "    and.w  #7,%%d0\n"                             \
 401     "    bra    6f\n"                                  \
 402     " 5: move.l (%0),(%1)+\n"                          \
 403     " 6: dbf    %%d0,5b\n"                             \
 404     "    and.w  #3,%2\n"                               \
 405     "    bra    8f\n"                                  \
 406     " 7: move.b (%0),(%1)+\n"                          \
 407     " 8: dbf    %2,7b\n"                               \
 408     "    moveq.l #0, %2\n"                             \
 409     " 9: \n"                                           \
 410     ".section .fixup,\"ax\"\n"                         \
 411     "    .even\n"                                      \
 412     "90: moveq.l #1, %2\n"                             \
 413     "    jra 9b\n"                                     \
 414     ".previous\n"                                      \
 415     ".section __ex_table,\"a\"\n"                      \
 416     "   .align 4\n"                                    \
 417     "   .long  1b,90b\n"                               \
 418     "   .long  3b,90b\n"                               \
 419     "   .long 31b,90b\n"                               \
 420     "   .long 32b,90b\n"                               \
 421     "   .long 33b,90b\n"                               \
 422     "   .long 34b,90b\n"                               \
 423     "   .long 35b,90b\n"                               \
 424     "   .long 36b,90b\n"                               \
 425     "   .long 37b,90b\n"                               \
 426     "   .long  5b,90b\n"                               \
 427     "   .long  7b,90b\n"                               \
 428     ".previous"                                        \
 429     : "=a"(s), "=a"(d), "=d"(len)                      \
 430     : "0"(s), "1"(d), "2"(len)                         \
 431     : "d0")
 432
 433
 434static int macscsi_pread (struct Scsi_Host *instance,
 435                          unsigned char *dst, int len)
 436{
 437   unsigned char *d;
 438   volatile unsigned char *s;
 439
 440   NCR5380_local_declare();
 441   NCR5380_setup(instance);
 442
 443   s = mac_scsi_drq+0x60;
 444   d = dst;
 445
 446/* These conditions are derived from MacOS */
 447
 448   while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
 449         && !(NCR5380_read(STATUS_REG) & SR_REQ))
 450      ;
 451   if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
 452         && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
 453      printk(KERN_ERR "Error in macscsi_pread\n");
 454      return -1;
 455   }
 456
 457   CP_IO_TO_MEM(s, d, len);
 458   
 459   if (len != 0) {
 460      printk(KERN_NOTICE "Bus error in macscsi_pread\n");
 461      return -1;
 462   }
 463   
 464   return 0;
 465}
 466
 467
 468#define CP_MEM_TO_IO(s,d,len)                           \
 469__asm__ __volatile__                                    \
 470    ("    cmp.w  #4,%2\n"                               \
 471     "    bls    8f\n"                                  \
 472     "    move.w %0,%%d0\n"                             \
 473     "    neg.b  %%d0\n"                                \
 474     "    and.w  #3,%%d0\n"                             \
 475     "    sub.w  %%d0,%2\n"                             \
 476     "    bra    2f\n"                                  \
 477     " 1: move.b (%0)+,(%1)\n"                          \
 478     " 2: dbf    %%d0,1b\n"                             \
 479     "    move.w %2,%%d0\n"                             \
 480     "    lsr.w  #5,%%d0\n"                             \
 481     "    bra    4f\n"                                  \
 482     " 3: move.l (%0)+,(%1)\n"                          \
 483     "31: move.l (%0)+,(%1)\n"                          \
 484     "32: move.l (%0)+,(%1)\n"                          \
 485     "33: move.l (%0)+,(%1)\n"                          \
 486     "34: move.l (%0)+,(%1)\n"                          \
 487     "35: move.l (%0)+,(%1)\n"                          \
 488     "36: move.l (%0)+,(%1)\n"                          \
 489     "37: move.l (%0)+,(%1)\n"                          \
 490     " 4: dbf    %%d0,3b\n"                             \
 491     "    move.w %2,%%d0\n"                             \
 492     "    lsr.w  #2,%%d0\n"                             \
 493     "    and.w  #7,%%d0\n"                             \
 494     "    bra    6f\n"                                  \
 495     " 5: move.l (%0)+,(%1)\n"                          \
 496     " 6: dbf    %%d0,5b\n"                             \
 497     "    and.w  #3,%2\n"                               \
 498     "    bra    8f\n"                                  \
 499     " 7: move.b (%0)+,(%1)\n"                          \
 500     " 8: dbf    %2,7b\n"                               \
 501     "    moveq.l #0, %2\n"                             \
 502     " 9: \n"                                           \
 503     ".section .fixup,\"ax\"\n"                         \
 504     "    .even\n"                                      \
 505     "90: moveq.l #1, %2\n"                             \
 506     "    jra 9b\n"                                     \
 507     ".previous\n"                                      \
 508     ".section __ex_table,\"a\"\n"                      \
 509     "   .align 4\n"                                    \
 510     "   .long  1b,90b\n"                               \
 511     "   .long  3b,90b\n"                               \
 512     "   .long 31b,90b\n"                               \
 513     "   .long 32b,90b\n"                               \
 514     "   .long 33b,90b\n"                               \
 515     "   .long 34b,90b\n"                               \
 516     "   .long 35b,90b\n"                               \
 517     "   .long 36b,90b\n"                               \
 518     "   .long 37b,90b\n"                               \
 519     "   .long  5b,90b\n"                               \
 520     "   .long  7b,90b\n"                               \
 521     ".previous"                                        \
 522     : "=a"(s), "=a"(d), "=d"(len)                      \
 523     : "0"(s), "1"(d), "2"(len)                         \
 524     : "d0")
 525
 526static int macscsi_pwrite (struct Scsi_Host *instance,
 527                                  unsigned char *src, int len)
 528{
 529   unsigned char *s;
 530   volatile unsigned char *d;
 531
 532   NCR5380_local_declare();
 533   NCR5380_setup(instance);
 534
 535   s = src;
 536   d = mac_scsi_drq;
 537   
 538/* These conditions are derived from MacOS */
 539
 540   while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) 
 541         && (!(NCR5380_read(STATUS_REG) & SR_REQ) 
 542            || (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))) 
 543      ;
 544   if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
 545      printk(KERN_ERR "Error in macscsi_pwrite\n");
 546      return -1;
 547   }
 548
 549   CP_MEM_TO_IO(s, d, len);   
 550
 551   if (len != 0) {
 552      printk(KERN_NOTICE "Bus error in macscsi_pwrite\n");
 553      return -1;
 554   }
 555   
 556   return 0;
 557}
 558
 559
 560#include "NCR5380.c"
 561
 562static struct scsi_host_template driver_template = {
 563        .proc_name                      = "Mac5380",
 564        .proc_info                      = macscsi_proc_info,
 565        .name                           = "Macintosh NCR5380 SCSI",
 566        .detect                         = macscsi_detect,
 567        .release                        = macscsi_release,
 568        .info                           = macscsi_info,
 569        .queuecommand                   = macscsi_queue_command,
 570        .eh_abort_handler               = macscsi_abort,
 571        .eh_bus_reset_handler           = macscsi_bus_reset,
 572        .can_queue                      = CAN_QUEUE,
 573        .this_id                        = 7,
 574        .sg_tablesize                   = SG_ALL,
 575        .cmd_per_lun                    = CMD_PER_LUN,
 576        .use_clustering                 = DISABLE_CLUSTERING
 577};
 578
 579
 580#include "scsi_module.c"
 581
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