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)); 263 264 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 } 312 313 int 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 */ 326 327 static 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 359 360 const 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") 432 433 434 static 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") 525 526 static 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" 561 562 static struct scsi_host_template driver_template = { 563 .proc_name = "Mac5380", 564 .show_info = macscsi_show_info, 565 .write_info = macscsi_write_info, 566 .name = "Macintosh NCR5380 SCSI", 567 .detect = macscsi_detect, 568 .release = macscsi_release, 569 .info = macscsi_info, 570 .queuecommand = macscsi_queue_command, 571 .eh_abort_handler = macscsi_abort, 572 .eh_bus_reset_handler = macscsi_bus_reset, 573 .can_queue = CAN_QUEUE, 574 .this_id = 7, 575 .sg_tablesize = SG_ALL, 576 .cmd_per_lun = CMD_PER_LUN, 577 .use_clustering = DISABLE_CLUSTERING 578 }; 579 580 581 #include "scsi_module.c" 582