drivers/scsi/mac_esp.c

   1 /*
   2  * 68k mac 53c9[46] scsi driver
   3  *
   4  * copyright (c) 1998, David Weis weisd3458@uni.edu
   5  *
   6  * debugging on Quadra 800 and 660AV Michael Schmitz, Dave Kilzer 7/98
   7  *
   8  * based loosely on cyber_esp.c
   9  */
  10
  11 /* these are unused for now */
  12 #define myreadl(addr) (*(volatile unsigned int *) (addr))
  13 #define mywritel(b, addr) ((*(volatile unsigned int *) (addr)) = (b))
  14
  15
  16 #include <linux/kernel.h>
  17 #include <linux/delay.h>
  18 #include <linux/types.h>
  19 #include <linux/ctype.h>
  20 #include <linux/string.h>
  21 #include <linux/slab.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/proc_fs.h>
  24 #include <linux/stat.h>
  25 #include <linux/init.h>
  26 #include <linux/interrupt.h>
  27
  28 #include "scsi.h"
  29 #include <scsi/scsi_host.h>
  30 #include "NCR53C9x.h"
  31
  32 #include <asm/io.h>
  33
  34 #include <asm/setup.h>
  35 #include <asm/irq.h>
  36 #include <asm/macints.h>
  37 #include <asm/machw.h>
  38 #include <asm/mac_via.h>
  39
  40 #include <asm/pgtable.h>
  41
  42 #include <asm/macintosh.h>
  43
  44 /* #define DEBUG_MAC_ESP */
  45
  46 #define mac_turnon_irq(x)       mac_enable_irq(x)
  47 #define mac_turnoff_irq(x)      mac_disable_irq(x)
  48
  49 extern void esp_handle(struct NCR_ESP *esp);
  50 extern void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs);
  51
  52 static int  dma_bytes_sent(struct NCR_ESP * esp, int fifo_count);
  53 static int  dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd *sp);
  54 static void dma_dump_state(struct NCR_ESP * esp);
  55 static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length);
  56 static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length);
  57 static void dma_ints_off(struct NCR_ESP * esp);
  58 static void dma_ints_on(struct NCR_ESP * esp);
  59 static int  dma_irq_p(struct NCR_ESP * esp);
  60 static int  dma_irq_p_quick(struct NCR_ESP * esp);
  61 static void dma_led_off(struct NCR_ESP * esp);
  62 static void dma_led_on(struct NCR_ESP *esp);
  63 static int  dma_ports_p(struct NCR_ESP *esp);
  64 static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write);
  65 static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write);
  66
  67 static int esp_dafb_dma_irq_p(struct NCR_ESP * espdev);
  68 static int esp_iosb_dma_irq_p(struct NCR_ESP * espdev);
  69
  70 static volatile unsigned char cmd_buffer[16];
  71                                 /* This is where all commands are put
  72                                  * before they are transferred to the ESP chip
  73                                  * via PIO.
  74                                  */
  75
  76 static int esp_initialized = 0;
  77
  78 static int setup_num_esps = -1;
  79 static int setup_disconnect = -1;
  80 static int setup_nosync = -1;
  81 static int setup_can_queue = -1;
  82 static int setup_cmd_per_lun = -1;
  83 static int setup_sg_tablesize = -1;
  84 #ifdef SUPPORT_TAGS
  85 static int setup_use_tagged_queuing = -1;
  86 #endif
  87 static int setup_hostid = -1;
  88
  89 /*
  90  * Experimental ESP inthandler; check macints.c to make sure dev_id is
  91  * set up properly!
  92  */
  93
  94 void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
  95 {
  96         struct NCR_ESP *esp = (struct NCR_ESP *) dev_id;
  97         int irq_p = 0;
  98
  99         /* Handle the one ESP interrupt showing at this IRQ level. */
 100         if(((esp)->irq & 0xff) == irq) {
 101         /*
 102          * Debug ..
 103          */
 104                 irq_p = esp->dma_irq_p(esp);
 105                 printk("mac_esp: irq_p %x current %p disconnected %p\n",
 106                         irq_p, esp->current_SC, esp->disconnected_SC);
 107
 108                 /*
 109                  * Mac: if we're here, it's an ESP interrupt for sure!
 110                  */
 111                 if((esp->current_SC || esp->disconnected_SC)) {
 112                         esp->dma_ints_off(esp);
 113
 114                         ESPIRQ(("I%d(", esp->esp_id));
 115                         esp_handle(esp);
 116                         ESPIRQ((")"));
 117
 118                         esp->dma_ints_on(esp);
 119                 }
 120         }
 121 }
 122
 123 /*
 124  * Debug hooks; use for playing with the interrupt flag testing and interrupt
 125  * acknowledge on the various machines
 126  */
 127
 128 void scsi_esp_polled(int irq, void *dev_id, struct pt_regs *pregs)
 129 {
 130         if (esp_initialized == 0)
 131                 return;
 132
 133         mac_esp_intr(irq, dev_id, pregs);
 134 }
 135
 136 void fake_intr(int irq, void *dev_id, struct pt_regs *pregs)
 137 {
 138 #ifdef DEBUG_MAC_ESP
 139         printk("mac_esp: got irq\n");
 140 #endif
 141
 142         mac_esp_intr(irq, dev_id, pregs);
 143 }
 144
 145 irqreturn_t fake_drq(int irq, void *dev_id, struct pt_regs *pregs)
 146 {
 147         printk("mac_esp: got drq\n");
 148         return IRQ_HANDLED;
 149 }
 150
 151 #define DRIVER_SETUP
 152
 153 /*
 154  * Function : mac_esp_setup(char *str)
 155  *
 156  * Purpose : booter command line initialization of the overrides array,
 157  *
 158  * Inputs : str - parameters, separated by commas.
 159  *
 160  * Currently unused in the new driver; need to add settable parameters to the
 161  * detect function.
 162  *
 163  */
 164
 165 static int __init mac_esp_setup(char *str) {
 166 #ifdef DRIVER_SETUP
 167         /* Format of mac53c9x parameter is:
 168          *   mac53c9x=<num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>
 169          * Negative values mean don't change.
 170          */
 171
 172         char *this_opt;
 173         long opt;
 174
 175         this_opt = strsep (&str, ",");
 176         if(this_opt) {
 177                 opt = simple_strtol( this_opt, NULL, 0 );
 178
 179                 if (opt >= 0 && opt <= 2)
 180                         setup_num_esps = opt;
 181                 else if (opt > 2)
 182                         printk( "mac_esp_setup: invalid number of hosts %ld !\n", opt );
 183
 184                 this_opt = strsep (&str, ",");
 185         }
 186         if(this_opt) {
 187                 opt = simple_strtol( this_opt, NULL, 0 );
 188
 189                 if (opt > 0)
 190                         setup_disconnect = opt;
 191
 192                 this_opt = strsep (&str, ",");
 193         }
 194         if(this_opt) {
 195                 opt = simple_strtol( this_opt, NULL, 0 );
 196
 197                 if (opt >= 0)
 198                         setup_nosync = opt;
 199
 200                 this_opt = strsep (&str, ",");
 201         }
 202         if(this_opt) {
 203                 opt = simple_strtol( this_opt, NULL, 0 );
 204
 205                 if (opt > 0)
 206                         setup_can_queue = opt;
 207
 208                 this_opt = strsep (&str, ",");
 209         }
 210         if(this_opt) {
 211                 opt = simple_strtol( this_opt, NULL, 0 );
 212
 213                 if (opt > 0)
 214                         setup_cmd_per_lun = opt;
 215
 216                 this_opt = strsep (&str, ",");
 217         }
 218         if(this_opt) {
 219                 opt = simple_strtol( this_opt, NULL, 0 );
 220
 221                 if (opt >= 0) {
 222                         setup_sg_tablesize = opt;
 223                         /* Must be <= SG_ALL (255) */
 224                         if (setup_sg_tablesize > SG_ALL)
 225                                 setup_sg_tablesize = SG_ALL;
 226                 }
 227
 228                 this_opt = strsep (&str, ",");
 229         }
 230         if(this_opt) {
 231                 opt = simple_strtol( this_opt, NULL, 0 );
 232
 233                 /* Must be between 0 and 7 */
 234                 if (opt >= 0 && opt <= 7)
 235                         setup_hostid = opt;
 236                 else if (opt > 7)
 237                         printk( "mac_esp_setup: invalid host ID %ld !\n", opt);
 238
 239                 this_opt = strsep (&str, ",");
 240         }
 241 #ifdef SUPPORT_TAGS
 242         if(this_opt) {
 243                 opt = simple_strtol( this_opt, NULL, 0 );
 244                 if (opt >= 0)
 245                         setup_use_tagged_queuing = !!opt;
 246         }
 247 #endif
 248 #endif
 249         return 1;
 250 }
 251
 252 __setup("mac53c9x=", mac_esp_setup);
 253
 254
 255 /*
 256  * ESP address 'detection'
 257  */
 258
 259 unsigned long get_base(int chip_num)
 260 {
 261         /*
 262          * using the chip_num and mac model, figure out where the
 263          * chips are mapped
 264          */
 265
 266         unsigned long io_base = 0x50f00000;
 267         unsigned int second_offset = 0x402;
 268         unsigned long scsi_loc = 0;
 269
 270         switch (macintosh_config->scsi_type) {
 271
 272         /* 950, 900, 700 */
 273         case MAC_SCSI_QUADRA2:
 274                 scsi_loc =  io_base + 0xf000 + ((chip_num == 0) ? 0 : second_offset);
 275                 break;
 276
 277         /* av's */
 278         case MAC_SCSI_QUADRA3:
 279                 scsi_loc = io_base + 0x18000 + ((chip_num == 0) ? 0 : second_offset);
 280                 break;
 281
 282         /* most quadra/centris models are like this */
 283         case MAC_SCSI_QUADRA:
 284                 scsi_loc = io_base + 0x10000;
 285                 break;
 286
 287         default:
 288                 printk("mac_esp: get_base: hit default!\n");
 289                 scsi_loc = io_base + 0x10000;
 290                 break;
 291
 292         } /* switch */
 293
 294         printk("mac_esp: io base at 0x%lx\n", scsi_loc);
 295
 296         return scsi_loc;
 297 }
 298
 299 /*
 300  * Model dependent ESP setup
 301  */
 302
 303 int mac_esp_detect(Scsi_Host_Template * tpnt)
 304 {
 305         int quick = 0;
 306         int chipnum, chipspresent = 0;
 307 #if 0
 308         unsigned long timeout;
 309 #endif
 310
 311         if (esp_initialized > 0)
 312                 return -ENODEV;
 313
 314         /* what do we have in this machine... */
 315         if (MACHW_PRESENT(MAC_SCSI_96)) {
 316                 chipspresent ++;
 317         }
 318
 319         if (MACHW_PRESENT(MAC_SCSI_96_2)) {
 320                 chipspresent ++;
 321         }
 322
 323         /* number of ESPs present ? */
 324         if (setup_num_esps >= 0) {
 325           if (chipspresent >= setup_num_esps)
 326             chipspresent = setup_num_esps;
 327           else
 328             printk("mac_esp_detect: num_hosts detected %d setup %d \n",
 329                    chipspresent, setup_num_esps);
 330         }
 331
 332         /* TODO: add disconnect / nosync flags */
 333
 334         /* setup variables */
 335         tpnt->can_queue =
 336           (setup_can_queue > 0) ? setup_can_queue : 7;
 337         tpnt->cmd_per_lun =
 338           (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : 1;
 339         tpnt->sg_tablesize =
 340           (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_ALL;
 341
 342         if (setup_hostid >= 0)
 343           tpnt->this_id = setup_hostid;
 344         else {
 345           /* use 7 as default */
 346           tpnt->this_id = 7;
 347         }
 348
 349 #ifdef SUPPORT_TAGS
 350         if (setup_use_tagged_queuing < 0)
 351                 setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING;
 352 #endif
 353
 354         for (chipnum = 0; chipnum < chipspresent; chipnum ++) {
 355                 struct NCR_ESP * esp;
 356
 357                 esp = esp_allocate(tpnt, (void *) NULL);
 358                 esp->eregs = (struct ESP_regs *) get_base(chipnum);
 359
 360                 esp->dma_irq_p = &esp_dafb_dma_irq_p;
 361                 if (chipnum == 0) {
 362
 363                         if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
 364                                 /* most machines except those below :-) */
 365                                 quick = 1;
 366                                 esp->dma_irq_p = &esp_iosb_dma_irq_p;
 367                         } else if (macintosh_config->scsi_type == MAC_SCSI_QUADRA3) {
 368                                 /* mostly av's */
 369                                 quick = 0;
 370                         } else {
 371                                 /* q950, 900, 700 */
 372                                 quick = 1;
 373                                 out_be32(0xf9800024, 0x1d1);
 374                                 esp->dregs = (void *) 0xf9800024;
 375                         }
 376
 377                 } else { /* chipnum */
 378
 379                         quick = 1;
 380                         out_be32(0xf9800028, 0x1d1);
 381                         esp->dregs = (void *) 0xf9800028;
 382
 383                 } /* chipnum == 0 */
 384
 385                 /* use pio for command bytes; pio for message/data: TBI */
 386                 esp->do_pio_cmds = 1;
 387
 388                 /* Set the command buffer */
 389                 esp->esp_command = (volatile unsigned char*) cmd_buffer;
 390                 esp->esp_command_dvma = (__u32) cmd_buffer;
 391
 392                 /* various functions */
 393                 esp->dma_bytes_sent = &dma_bytes_sent;
 394                 esp->dma_can_transfer = &dma_can_transfer;
 395                 esp->dma_dump_state = &dma_dump_state;
 396                 esp->dma_init_read = NULL;
 397                 esp->dma_init_write = NULL;
 398                 esp->dma_ints_off = &dma_ints_off;
 399                 esp->dma_ints_on = &dma_ints_on;
 400
 401                 esp->dma_ports_p = &dma_ports_p;
 402
 403
 404                 /* Optional functions */
 405                 esp->dma_barrier = NULL;
 406                 esp->dma_drain = NULL;
 407                 esp->dma_invalidate = NULL;
 408                 esp->dma_irq_entry = NULL;
 409                 esp->dma_irq_exit = NULL;
 410                 esp->dma_led_on = NULL;
 411                 esp->dma_led_off = NULL;
 412                 esp->dma_poll = NULL;
 413                 esp->dma_reset = NULL;
 414
 415                 /* SCSI chip speed */
 416                 /* below esp->cfreq = 40000000; */
 417
 418
 419                 if (quick) {
 420                         /* 'quick' means there's handshake glue logic like in the 5380 case */
 421                         esp->dma_setup = &dma_setup_quick;
 422                 } else {
 423                         esp->dma_setup = &dma_setup;
 424                 }
 425
 426                 if (chipnum == 0) {
 427
 428                         esp->irq = IRQ_MAC_SCSI;
 429
 430                         request_irq(IRQ_MAC_SCSI, esp_intr, 0, "Mac ESP SCSI", esp->ehost);
 431 #if 0   /* conflicts with IOP ADB */
 432                         request_irq(IRQ_MAC_SCSIDRQ, fake_drq, 0, "Mac ESP DRQ", esp->ehost);
 433 #endif
 434
 435                         if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) {
 436                                 esp->cfreq = 16500000;
 437                         } else {
 438                                 esp->cfreq = 25000000;
 439                         }
 440
 441
 442                 } else { /* chipnum == 1 */
 443
 444                         esp->irq = IRQ_MAC_SCSIDRQ;
 445 #if 0   /* conflicts with IOP ADB */
 446                         request_irq(IRQ_MAC_SCSIDRQ, esp_intr, 0, "Mac ESP SCSI 2", esp->ehost);
 447 #endif
 448
 449                         esp->cfreq = 25000000;
 450
 451                 }
 452
 453                 if (quick) {
 454                         printk("esp: using quick version\n");
 455                 }
 456
 457                 printk("esp: addr at 0x%p\n", esp->eregs);
 458
 459                 esp->scsi_id = 7;
 460                 esp->diff = 0;
 461
 462                 esp_initialize(esp);
 463
 464         } /* for chipnum */
 465
 466         if (chipspresent)
 467                 printk("\nmac_esp: %d esp controllers found\n", chipspresent);
 468
 469         esp_initialized = chipspresent;
 470
 471         return chipspresent;
 472 }
 473
 474 static int mac_esp_release(struct Scsi_Host *shost)
 475 {
 476         if (shost->irq)
 477                 free_irq(shost->irq, NULL);
 478         if (shost->io_port && shost->n_io_port)
 479                 release_region(shost->io_port, shost->n_io_port);
 480         scsi_unregister(shost);
 481         return 0;
 482 }
 483
 484 /*
 485  * I've been wondering what this is supposed to do, for some time. Talking
 486  * to Allen Briggs: These machines have an extra register someplace where the
 487  * DRQ pin of the ESP can be monitored. That isn't useful for determining
 488  * anything else (such as reselect interrupt or other magic) though.
 489  * Maybe make the semantics should be changed like
 490  * if (esp->current_SC)
 491  *      ... check DRQ flag ...
 492  * else
 493  *      ... disconnected, check pending VIA interrupt ...
 494  *
 495  * There's a problem with using the dabf flag or mac_irq_pending() here: both
 496  * seem to return 1 even though no interrupt is currently pending, resulting
 497  * in esp_exec_cmd() holding off the next command, and possibly infinite loops
 498  * in esp_intr().
 499  * Short term fix: just use esp_status & ESP_STAT_INTR here, as long as we
 500  * use simple PIO. The DRQ status will be important when implementing pseudo
 501  * DMA mode (set up ESP transfer count, return, do a batch of bytes in PIO or
 502  * 'hardware handshake' mode upon DRQ).
 503  * If you plan on changing this (i.e. to save the esp_status register access in
 504  * favor of a VIA register access or a shadow register for the IFR), make sure
 505  * to try a debug version of this first to monitor what registers would be a good
 506  * indicator of the ESP interrupt.
 507  */
 508
 509 static int esp_dafb_dma_irq_p(struct NCR_ESP * esp)
 510 {
 511         unsigned int ret;
 512         int sreg = esp_read(esp->eregs->esp_status);
 513
 514 #ifdef DEBUG_MAC_ESP
 515         printk("mac_esp: esp_dafb_dma_irq_p dafb %d irq %d\n",
 516                 readl(esp->dregs), mac_irq_pending(IRQ_MAC_SCSI));
 517 #endif
 518
 519         sreg &= ESP_STAT_INTR;
 520
 521         /*
 522          * maybe working; this is essentially what's used for iosb_dma_irq_p
 523          */
 524         if (sreg)
 525                 return 1;
 526         else
 527                 return 0;
 528
 529         /*
 530          * didn't work ...
 531          */
 532 #if 0
 533         if (esp->current_SC)
 534                 ret = readl(esp->dregs) & 0x200;
 535         else if (esp->disconnected_SC)
 536                 ret = 1; /* sreg ?? */
 537         else
 538                 ret = mac_irq_pending(IRQ_MAC_SCSI);
 539
 540         return(ret);
 541 #endif
 542
 543 }
 544
 545 /*
 546  * See above: testing mac_irq_pending always returned 8 (SCSI IRQ) regardless
 547  * of the actual ESP status.
 548  */
 549
 550 static int esp_iosb_dma_irq_p(struct NCR_ESP * esp)
 551 {
 552         int ret  = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
 553         int sreg = esp_read(esp->eregs->esp_status);
 554
 555 #ifdef DEBUG_MAC_ESP
 556         printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n",
 557                 mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI),
 558                 sreg, esp->current_SC, esp->disconnected_SC);
 559 #endif
 560
 561         sreg &= ESP_STAT_INTR;
 562
 563         if (sreg)
 564                 return (sreg);
 565         else
 566                 return 0;
 567 }
 568
 569 /*
 570  * This seems to be OK for PIO at least ... usually 0 after PIO.
 571  */
 572
 573 static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count)
 574 {
 575
 576 #ifdef DEBUG_MAC_ESP
 577         printk("mac_esp: dma bytes sent = %x\n", fifo_count);
 578 #endif
 579
 580         return fifo_count;
 581 }
 582
 583 /*
 584  * dma_can_transfer is used to switch between DMA and PIO, if DMA (pseudo)
 585  * is ever implemented. Returning 0 here will use PIO.
 586  */
 587
 588 static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd * sp)
 589 {
 590         unsigned long sz = sp->SCp.this_residual;
 591 #if 0   /* no DMA yet; make conditional */
 592         if (sz > 0x10000000) {
 593                 sz = 0x10000000;
 594         }
 595         printk("mac_esp: dma can transfer = 0lx%x\n", sz);
 596 #else
 597
 598 #ifdef DEBUG_MAC_ESP
 599         printk("mac_esp: pio to transfer = %ld\n", sz);
 600 #endif
 601
 602         sz = 0;
 603 #endif
 604         return sz;
 605 }
 606
 607 /*
 608  * Not yet ...
 609  */
 610
 611 static void dma_dump_state(struct NCR_ESP * esp)
 612 {
 613 #ifdef DEBUG_MAC_ESP
 614         printk("mac_esp: dma_dump_state: called\n");
 615 #endif
 616 #if 0
 617         ESPLOG(("esp%d: dma -- cond_reg<%02x>\n",
 618                 esp->esp_id, ((struct mac_dma_registers *)
 619                 (esp->dregs))->cond_reg));
 620 #endif
 621 }
 622
 623 /*
 624  * DMA setup: should be used to set up the ESP transfer count for pseudo
 625  * DMA transfers; need a DRQ transfer function to do the actual transfer
 626  */
 627
 628 static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length)
 629 {
 630         printk("mac_esp: dma_init_read\n");
 631 }
 632
 633
 634 static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length)
 635 {
 636         printk("mac_esp: dma_init_write\n");
 637 }
 638
 639
 640 static void dma_ints_off(struct NCR_ESP * esp)
 641 {
 642         mac_turnoff_irq(esp->irq);
 643 }
 644
 645
 646 static void dma_ints_on(struct NCR_ESP * esp)
 647 {
 648         mac_turnon_irq(esp->irq);
 649 }
 650
 651 /*
 652  * generic dma_irq_p(), unused
 653  */
 654
 655 static int dma_irq_p(struct NCR_ESP * esp)
 656 {
 657         int i = esp_read(esp->eregs->esp_status);
 658
 659 #ifdef DEBUG_MAC_ESP
 660         printk("mac_esp: dma_irq_p status %d\n", i);
 661 #endif
 662
 663         return (i & ESP_STAT_INTR);
 664 }
 665
 666 static int dma_irq_p_quick(struct NCR_ESP * esp)
 667 {
 668         /*
 669          * Copied from iosb_dma_irq_p()
 670          */
 671         int ret  = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ);
 672         int sreg = esp_read(esp->eregs->esp_status);
 673
 674 #ifdef DEBUG_MAC_ESP
 675         printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n",
 676                 mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI),
 677                 sreg, esp->current_SC, esp->disconnected_SC);
 678 #endif
 679
 680         sreg &= ESP_STAT_INTR;
 681
 682         if (sreg)
 683                 return (sreg);
 684         else
 685                 return 0;
 686
 687 }
 688
 689 static void dma_led_off(struct NCR_ESP * esp)
 690 {
 691 #ifdef DEBUG_MAC_ESP
 692         printk("mac_esp: dma_led_off: called\n");
 693 #endif
 694 }
 695
 696
 697 static void dma_led_on(struct NCR_ESP * esp)
 698 {
 699 #ifdef DEBUG_MAC_ESP
 700         printk("mac_esp: dma_led_on: called\n");
 701 #endif
 702 }
 703
 704
 705 static int dma_ports_p(struct NCR_ESP * esp)
 706 {
 707         return 0;
 708 }
 709
 710
 711 static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write)
 712 {
 713
 714 #ifdef DEBUG_MAC_ESP
 715         printk("mac_esp: dma_setup\n");
 716 #endif
 717
 718         if (write) {
 719                 dma_init_read(esp, (char *) addr, count);
 720         } else {
 721                 dma_init_write(esp, (char *) addr, count);
 722         }
 723 }
 724
 725
 726 static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write)
 727 {
 728 #ifdef DEBUG_MAC_ESP
 729         printk("mac_esp: dma_setup_quick\n");
 730 #endif
 731 }
 732
 733 static Scsi_Host_Template driver_template = {
 734         .proc_name              = "esp",
 735         .name                   = "Mac 53C9x SCSI",
 736         .detect                 = mac_esp_detect,
 737         .slave_alloc            = esp_slave_alloc,
 738         .slave_destroy          = esp_slave_destroy,
 739         .release                = mac_esp_release,
 740         .info                   = esp_info,
 741         .queuecommand           = esp_queue,
 742         .eh_abort_handler       = esp_abort,
 743         .eh_bus_reset_handler   = esp_reset,
 744         .can_queue              = 7,
 745         .this_id                = 7,
 746         .sg_tablesize           = SG_ALL,
 747         .cmd_per_lun            = 1,
 748         .use_clustering         = DISABLE_CLUSTERING
 749 };
 750
 751
 752 #include "scsi_module.c"
 753
 754 MODULE_LICENSE("GPL");