1 /* 2 * NCR 5380 generic driver routines. These should make it *trivial* 3 * to implement 5380 SCSI drivers under Linux with a non-trantor 4 * architecture. 5 * 6 * Note that these routines also work with NR53c400 family chips. 7 * 8 * Copyright 1993, Drew Eckhardt 9 * Visionary Computing 10 * (Unix and Linux consulting and custom programming) 11 * drew@colorado.edu 12 * +1 (303) 666-5836 13 * 14 * For more information, please consult 15 * 16 * NCR 5380 Family 17 * SCSI Protocol Controller 18 * Databook 19 * 20 * NCR Microelectronics 21 * 1635 Aeroplaza Drive 22 * Colorado Springs, CO 80916 23 * 1+ (719) 578-3400 24 * 1+ (800) 334-5454 25 */ 26 27 /* 28 * With contributions from Ray Van Tassle, Ingmar Baumgart, 29 * Ronald van Cuijlenborg, Alan Cox and others. 30 */ 31 32 /* 33 * Further development / testing that should be done : 34 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete 35 * code so that everything does the same thing that's done at the 36 * end of a pseudo-DMA read operation. 37 * 38 * 2. Fix REAL_DMA (interrupt driven, polled works fine) - 39 * basically, transfer size needs to be reduced by one 40 * and the last byte read as is done with PSEUDO_DMA. 41 * 42 * 4. Test SCSI-II tagged queueing (I have no devices which support 43 * tagged queueing) 44 */ 45 46 #ifndef notyet 47 #undef REAL_DMA 48 #endif 49 50 #ifdef BOARD_REQUIRES_NO_DELAY 51 #define io_recovery_delay(x) 52 #else 53 #define io_recovery_delay(x) udelay(x) 54 #endif 55 56 /* 57 * Design 58 * 59 * This is a generic 5380 driver. To use it on a different platform, 60 * one simply writes appropriate system specific macros (ie, data 61 * transfer - some PC's will use the I/O bus, 68K's must use 62 * memory mapped) and drops this file in their 'C' wrapper. 63 * 64 * As far as command queueing, two queues are maintained for 65 * each 5380 in the system - commands that haven't been issued yet, 66 * and commands that are currently executing. This means that an 67 * unlimited number of commands may be queued, letting 68 * more commands propagate from the higher driver levels giving higher 69 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 70 * allowing multiple commands to propagate all the way to a SCSI-II device 71 * while a command is already executing. 72 * 73 * 74 * Issues specific to the NCR5380 : 75 * 76 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 77 * piece of hardware that requires you to sit in a loop polling for 78 * the REQ signal as long as you are connected. Some devices are 79 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 80 * while doing long seek operations. [...] These 81 * broken devices are the exception rather than the rule and I'd rather 82 * spend my time optimizing for the normal case. 83 * 84 * Architecture : 85 * 86 * At the heart of the design is a coroutine, NCR5380_main, 87 * which is started from a workqueue for each NCR5380 host in the 88 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by 89 * removing the commands from the issue queue and calling 90 * NCR5380_select() if a nexus is not established. 91 * 92 * Once a nexus is established, the NCR5380_information_transfer() 93 * phase goes through the various phases as instructed by the target. 94 * if the target goes into MSG IN and sends a DISCONNECT message, 95 * the command structure is placed into the per instance disconnected 96 * queue, and NCR5380_main tries to find more work. If the target is 97 * idle for too long, the system will try to sleep. 98 * 99 * If a command has disconnected, eventually an interrupt will trigger, 100 * calling NCR5380_intr() which will in turn call NCR5380_reselect 101 * to reestablish a nexus. This will run main if necessary. 102 * 103 * On command termination, the done function will be called as 104 * appropriate. 105 * 106 * SCSI pointers are maintained in the SCp field of SCSI command 107 * structures, being initialized after the command is connected 108 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 109 * Note that in violation of the standard, an implicit SAVE POINTERS operation 110 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 111 */ 112 113 /* 114 * Using this file : 115 * This file a skeleton Linux SCSI driver for the NCR 5380 series 116 * of chips. To use it, you write an architecture specific functions 117 * and macros and include this file in your driver. 118 * 119 * These macros control options : 120 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 121 * defined. 122 * 123 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 124 * for commands that return with a CHECK CONDITION status. 125 * 126 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential 127 * transceivers. 128 * 129 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or 130 * override-configure an IRQ. 131 * 132 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. 133 * 134 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 135 * 136 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't 137 * rely on phase mismatch and EOP interrupts to determine end 138 * of phase. 139 * 140 * These macros MUST be defined : 141 * 142 * NCR5380_read(register) - read from the specified register 143 * 144 * NCR5380_write(register, value) - write to the specific register 145 * 146 * NCR5380_implementation_fields - additional fields needed for this 147 * specific implementation of the NCR5380 148 * 149 * Either real DMA *or* pseudo DMA may be implemented 150 * REAL functions : 151 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 152 * Note that the DMA setup functions should return the number of bytes 153 * that they were able to program the controller for. 154 * 155 * Also note that generic i386/PC versions of these macros are 156 * available as NCR5380_i386_dma_write_setup, 157 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 158 * 159 * NCR5380_dma_write_setup(instance, src, count) - initialize 160 * NCR5380_dma_read_setup(instance, dst, count) - initialize 161 * NCR5380_dma_residual(instance); - residual count 162 * 163 * PSEUDO functions : 164 * NCR5380_pwrite(instance, src, count) 165 * NCR5380_pread(instance, dst, count); 166 * 167 * The generic driver is initialized by calling NCR5380_init(instance), 168 * after setting the appropriate host specific fields and ID. If the 169 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 170 * possible) function may be used. 171 */ 172 173 static int do_abort(struct Scsi_Host *); 174 static void do_reset(struct Scsi_Host *); 175 176 /** 177 * initialize_SCp - init the scsi pointer field 178 * @cmd: command block to set up 179 * 180 * Set up the internal fields in the SCSI command. 181 */ 182 183 static inline void initialize_SCp(struct scsi_cmnd *cmd) 184 { 185 /* 186 * Initialize the Scsi Pointer field so that all of the commands in the 187 * various queues are valid. 188 */ 189 190 if (scsi_bufflen(cmd)) { 191 cmd->SCp.buffer = scsi_sglist(cmd); 192 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; 193 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 194 cmd->SCp.this_residual = cmd->SCp.buffer->length; 195 } else { 196 cmd->SCp.buffer = NULL; 197 cmd->SCp.buffers_residual = 0; 198 cmd->SCp.ptr = NULL; 199 cmd->SCp.this_residual = 0; 200 } 201 202 cmd->SCp.Status = 0; 203 cmd->SCp.Message = 0; 204 } 205 206 /** 207 * NCR5380_poll_politely2 - wait for two chip register values 208 * @instance: controller to poll 209 * @reg1: 5380 register to poll 210 * @bit1: Bitmask to check 211 * @val1: Expected value 212 * @reg2: Second 5380 register to poll 213 * @bit2: Second bitmask to check 214 * @val2: Second expected value 215 * @wait: Time-out in jiffies 216 * 217 * Polls the chip in a reasonably efficient manner waiting for an 218 * event to occur. After a short quick poll we begin to yield the CPU 219 * (if possible). In irq contexts the time-out is arbitrarily limited. 220 * Callers may hold locks as long as they are held in irq mode. 221 * 222 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT. 223 */ 224 225 static int NCR5380_poll_politely2(struct Scsi_Host *instance, 226 int reg1, int bit1, int val1, 227 int reg2, int bit2, int val2, int wait) 228 { 229 struct NCR5380_hostdata *hostdata = shost_priv(instance); 230 unsigned long deadline = jiffies + wait; 231 unsigned long n; 232 233 /* Busy-wait for up to 10 ms */ 234 n = min(10000U, jiffies_to_usecs(wait)); 235 n *= hostdata->accesses_per_ms; 236 n /= 2000; 237 do { 238 if ((NCR5380_read(reg1) & bit1) == val1) 239 return 0; 240 if ((NCR5380_read(reg2) & bit2) == val2) 241 return 0; 242 cpu_relax(); 243 } while (n--); 244 245 if (irqs_disabled() || in_interrupt()) 246 return -ETIMEDOUT; 247 248 /* Repeatedly sleep for 1 ms until deadline */ 249 while (time_is_after_jiffies(deadline)) { 250 schedule_timeout_uninterruptible(1); 251 if ((NCR5380_read(reg1) & bit1) == val1) 252 return 0; 253 if ((NCR5380_read(reg2) & bit2) == val2) 254 return 0; 255 } 256 257 return -ETIMEDOUT; 258 } 259 260 static inline int NCR5380_poll_politely(struct Scsi_Host *instance, 261 int reg, int bit, int val, int wait) 262 { 263 return NCR5380_poll_politely2(instance, reg, bit, val, 264 reg, bit, val, wait); 265 } 266 267 #if NDEBUG 268 static struct { 269 unsigned char mask; 270 const char *name; 271 } signals[] = { 272 {SR_DBP, "PARITY"}, 273 {SR_RST, "RST"}, 274 {SR_BSY, "BSY"}, 275 {SR_REQ, "REQ"}, 276 {SR_MSG, "MSG"}, 277 {SR_CD, "CD"}, 278 {SR_IO, "IO"}, 279 {SR_SEL, "SEL"}, 280 {0, NULL} 281 }, 282 basrs[] = { 283 {BASR_ATN, "ATN"}, 284 {BASR_ACK, "ACK"}, 285 {0, NULL} 286 }, 287 icrs[] = { 288 {ICR_ASSERT_RST, "ASSERT RST"}, 289 {ICR_ASSERT_ACK, "ASSERT ACK"}, 290 {ICR_ASSERT_BSY, "ASSERT BSY"}, 291 {ICR_ASSERT_SEL, "ASSERT SEL"}, 292 {ICR_ASSERT_ATN, "ASSERT ATN"}, 293 {ICR_ASSERT_DATA, "ASSERT DATA"}, 294 {0, NULL} 295 }, 296 mrs[] = { 297 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 298 {MR_TARGET, "MODE TARGET"}, 299 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 300 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 301 {MR_ENABLE_EOP_INTR, "MODE EOP INTR"}, 302 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 303 {MR_DMA_MODE, "MODE DMA"}, 304 {MR_ARBITRATE, "MODE ARBITRATION"}, 305 {0, NULL} 306 }; 307 308 /** 309 * NCR5380_print - print scsi bus signals 310 * @instance: adapter state to dump 311 * 312 * Print the SCSI bus signals for debugging purposes 313 */ 314 315 static void NCR5380_print(struct Scsi_Host *instance) 316 { 317 unsigned char status, data, basr, mr, icr, i; 318 319 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 320 status = NCR5380_read(STATUS_REG); 321 mr = NCR5380_read(MODE_REG); 322 icr = NCR5380_read(INITIATOR_COMMAND_REG); 323 basr = NCR5380_read(BUS_AND_STATUS_REG); 324 325 printk("STATUS_REG: %02x ", status); 326 for (i = 0; signals[i].mask; ++i) 327 if (status & signals[i].mask) 328 printk(",%s", signals[i].name); 329 printk("\nBASR: %02x ", basr); 330 for (i = 0; basrs[i].mask; ++i) 331 if (basr & basrs[i].mask) 332 printk(",%s", basrs[i].name); 333 printk("\nICR: %02x ", icr); 334 for (i = 0; icrs[i].mask; ++i) 335 if (icr & icrs[i].mask) 336 printk(",%s", icrs[i].name); 337 printk("\nMODE: %02x ", mr); 338 for (i = 0; mrs[i].mask; ++i) 339 if (mr & mrs[i].mask) 340 printk(",%s", mrs[i].name); 341 printk("\n"); 342 } 343 344 static struct { 345 unsigned char value; 346 const char *name; 347 } phases[] = { 348 {PHASE_DATAOUT, "DATAOUT"}, 349 {PHASE_DATAIN, "DATAIN"}, 350 {PHASE_CMDOUT, "CMDOUT"}, 351 {PHASE_STATIN, "STATIN"}, 352 {PHASE_MSGOUT, "MSGOUT"}, 353 {PHASE_MSGIN, "MSGIN"}, 354 {PHASE_UNKNOWN, "UNKNOWN"} 355 }; 356 357 /** 358 * NCR5380_print_phase - show SCSI phase 359 * @instance: adapter to dump 360 * 361 * Print the current SCSI phase for debugging purposes 362 */ 363 364 static void NCR5380_print_phase(struct Scsi_Host *instance) 365 { 366 unsigned char status; 367 int i; 368 369 status = NCR5380_read(STATUS_REG); 370 if (!(status & SR_REQ)) 371 shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n"); 372 else { 373 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && 374 (phases[i].value != (status & PHASE_MASK)); ++i) 375 ; 376 shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name); 377 } 378 } 379 #endif 380 381 382 static int probe_irq __initdata; 383 384 /** 385 * probe_intr - helper for IRQ autoprobe 386 * @irq: interrupt number 387 * @dev_id: unused 388 * @regs: unused 389 * 390 * Set a flag to indicate the IRQ in question was received. This is 391 * used by the IRQ probe code. 392 */ 393 394 static irqreturn_t __init probe_intr(int irq, void *dev_id) 395 { 396 probe_irq = irq; 397 return IRQ_HANDLED; 398 } 399 400 /** 401 * NCR5380_probe_irq - find the IRQ of an NCR5380 402 * @instance: NCR5380 controller 403 * @possible: bitmask of ISA IRQ lines 404 * 405 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ 406 * and then looking to see what interrupt actually turned up. 407 */ 408 409 static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, 410 int possible) 411 { 412 struct NCR5380_hostdata *hostdata = shost_priv(instance); 413 unsigned long timeout; 414 int trying_irqs, i, mask; 415 416 for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1) 417 if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) 418 trying_irqs |= mask; 419 420 timeout = jiffies + msecs_to_jiffies(250); 421 probe_irq = NO_IRQ; 422 423 /* 424 * A interrupt is triggered whenever BSY = false, SEL = true 425 * and a bit set in the SELECT_ENABLE_REG is asserted on the 426 * SCSI bus. 427 * 428 * Note that the bus is only driven when the phase control signals 429 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 430 * to zero. 431 */ 432 433 NCR5380_write(TARGET_COMMAND_REG, 0); 434 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 435 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 436 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 437 438 while (probe_irq == NO_IRQ && time_before(jiffies, timeout)) 439 schedule_timeout_uninterruptible(1); 440 441 NCR5380_write(SELECT_ENABLE_REG, 0); 442 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 443 444 for (i = 1, mask = 2; i < 16; ++i, mask <<= 1) 445 if (trying_irqs & mask) 446 free_irq(i, NULL); 447 448 return probe_irq; 449 } 450 451 /** 452 * NCR58380_info - report driver and host information 453 * @instance: relevant scsi host instance 454 * 455 * For use as the host template info() handler. 456 */ 457 458 static const char *NCR5380_info(struct Scsi_Host *instance) 459 { 460 struct NCR5380_hostdata *hostdata = shost_priv(instance); 461 462 return hostdata->info; 463 } 464 465 static void prepare_info(struct Scsi_Host *instance) 466 { 467 struct NCR5380_hostdata *hostdata = shost_priv(instance); 468 469 snprintf(hostdata->info, sizeof(hostdata->info), 470 "%s, io_port 0x%lx, n_io_port %d, " 471 "base 0x%lx, irq %d, " 472 "can_queue %d, cmd_per_lun %d, " 473 "sg_tablesize %d, this_id %d, " 474 "flags { %s%s%s}, " 475 "options { %s} ", 476 instance->hostt->name, instance->io_port, instance->n_io_port, 477 instance->base, instance->irq, 478 instance->can_queue, instance->cmd_per_lun, 479 instance->sg_tablesize, instance->this_id, 480 hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "", 481 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "", 482 hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "", 483 #ifdef AUTOPROBE_IRQ 484 "AUTOPROBE_IRQ " 485 #endif 486 #ifdef DIFFERENTIAL 487 "DIFFERENTIAL " 488 #endif 489 #ifdef REAL_DMA 490 "REAL_DMA " 491 #endif 492 #ifdef REAL_DMA_POLL 493 "REAL_DMA_POLL " 494 #endif 495 #ifdef PARITY 496 "PARITY " 497 #endif 498 #ifdef PSEUDO_DMA 499 "PSEUDO_DMA " 500 #endif 501 ""); 502 } 503 504 #ifdef PSEUDO_DMA 505 static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, 506 char *buffer, int length) 507 { 508 struct NCR5380_hostdata *hostdata = shost_priv(instance); 509 510 hostdata->spin_max_r = 0; 511 hostdata->spin_max_w = 0; 512 return 0; 513 } 514 515 static int __maybe_unused NCR5380_show_info(struct seq_file *m, 516 struct Scsi_Host *instance) 517 { 518 struct NCR5380_hostdata *hostdata = shost_priv(instance); 519 520 seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n", 521 hostdata->spin_max_w, hostdata->spin_max_r); 522 return 0; 523 } 524 #endif 525 526 /** 527 * NCR5380_init - initialise an NCR5380 528 * @instance: adapter to configure 529 * @flags: control flags 530 * 531 * Initializes *instance and corresponding 5380 chip, 532 * with flags OR'd into the initial flags value. 533 * 534 * Notes : I assume that the host, hostno, and id bits have been 535 * set correctly. I don't care about the irq and other fields. 536 * 537 * Returns 0 for success 538 */ 539 540 static int NCR5380_init(struct Scsi_Host *instance, int flags) 541 { 542 struct NCR5380_hostdata *hostdata = shost_priv(instance); 543 int i; 544 unsigned long deadline; 545 546 hostdata->host = instance; 547 hostdata->id_mask = 1 << instance->this_id; 548 hostdata->id_higher_mask = 0; 549 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 550 if (i > hostdata->id_mask) 551 hostdata->id_higher_mask |= i; 552 for (i = 0; i < 8; ++i) 553 hostdata->busy[i] = 0; 554 #ifdef REAL_DMA 555 hostdata->dmalen = 0; 556 #endif 557 spin_lock_init(&hostdata->lock); 558 hostdata->connected = NULL; 559 hostdata->sensing = NULL; 560 INIT_LIST_HEAD(&hostdata->autosense); 561 INIT_LIST_HEAD(&hostdata->unissued); 562 INIT_LIST_HEAD(&hostdata->disconnected); 563 564 hostdata->flags = flags; 565 566 INIT_WORK(&hostdata->main_task, NCR5380_main); 567 hostdata->work_q = alloc_workqueue("ncr5380_%d", 568 WQ_UNBOUND | WQ_MEM_RECLAIM, 569 1, instance->host_no); 570 if (!hostdata->work_q) 571 return -ENOMEM; 572 573 prepare_info(instance); 574 575 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 576 NCR5380_write(MODE_REG, MR_BASE); 577 NCR5380_write(TARGET_COMMAND_REG, 0); 578 NCR5380_write(SELECT_ENABLE_REG, 0); 579 580 /* Calibrate register polling loop */ 581 i = 0; 582 deadline = jiffies + 1; 583 do { 584 cpu_relax(); 585 } while (time_is_after_jiffies(deadline)); 586 deadline += msecs_to_jiffies(256); 587 do { 588 NCR5380_read(STATUS_REG); 589 ++i; 590 cpu_relax(); 591 } while (time_is_after_jiffies(deadline)); 592 hostdata->accesses_per_ms = i / 256; 593 594 return 0; 595 } 596 597 /** 598 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems. 599 * @instance: adapter to check 600 * 601 * If the system crashed, it may have crashed with a connected target and 602 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the 603 * currently established nexus, which we know nothing about. Failing that 604 * do a bus reset. 605 * 606 * Note that a bus reset will cause the chip to assert IRQ. 607 * 608 * Returns 0 if successful, otherwise -ENXIO. 609 */ 610 611 static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance) 612 { 613 struct NCR5380_hostdata *hostdata = shost_priv(instance); 614 int pass; 615 616 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 617 switch (pass) { 618 case 1: 619 case 3: 620 case 5: 621 shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n"); 622 NCR5380_poll_politely(instance, 623 STATUS_REG, SR_BSY, 0, 5 * HZ); 624 break; 625 case 2: 626 shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n"); 627 do_abort(instance); 628 break; 629 case 4: 630 shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n"); 631 do_reset(instance); 632 /* Wait after a reset; the SCSI standard calls for 633 * 250ms, we wait 500ms to be on the safe side. 634 * But some Toshiba CD-ROMs need ten times that. 635 */ 636 if (hostdata->flags & FLAG_TOSHIBA_DELAY) 637 msleep(2500); 638 else 639 msleep(500); 640 break; 641 case 6: 642 shost_printk(KERN_ERR, instance, "bus locked solid\n"); 643 return -ENXIO; 644 } 645 } 646 return 0; 647 } 648 649 /** 650 * NCR5380_exit - remove an NCR5380 651 * @instance: adapter to remove 652 * 653 * Assumes that no more work can be queued (e.g. by NCR5380_intr). 654 */ 655 656 static void NCR5380_exit(struct Scsi_Host *instance) 657 { 658 struct NCR5380_hostdata *hostdata = shost_priv(instance); 659 660 cancel_work_sync(&hostdata->main_task); 661 destroy_workqueue(hostdata->work_q); 662 } 663 664 /** 665 * complete_cmd - finish processing a command and return it to the SCSI ML 666 * @instance: the host instance 667 * @cmd: command to complete 668 */ 669 670 static void complete_cmd(struct Scsi_Host *instance, 671 struct scsi_cmnd *cmd) 672 { 673 struct NCR5380_hostdata *hostdata = shost_priv(instance); 674 675 dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd); 676 677 if (hostdata->sensing == cmd) { 678 /* Autosense processing ends here */ 679 if ((cmd->result & 0xff) != SAM_STAT_GOOD) { 680 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 681 set_host_byte(cmd, DID_ERROR); 682 } else 683 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 684 hostdata->sensing = NULL; 685 } 686 687 hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun); 688 689 cmd->scsi_done(cmd); 690 } 691 692 /** 693 * NCR5380_queue_command - queue a command 694 * @instance: the relevant SCSI adapter 695 * @cmd: SCSI command 696 * 697 * cmd is added to the per-instance issue queue, with minor 698 * twiddling done to the host specific fields of cmd. If the 699 * main coroutine is not running, it is restarted. 700 */ 701 702 static int NCR5380_queue_command(struct Scsi_Host *instance, 703 struct scsi_cmnd *cmd) 704 { 705 struct NCR5380_hostdata *hostdata = shost_priv(instance); 706 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); 707 unsigned long flags; 708 709 #if (NDEBUG & NDEBUG_NO_WRITE) 710 switch (cmd->cmnd[0]) { 711 case WRITE_6: 712 case WRITE_10: 713 shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n"); 714 cmd->result = (DID_ERROR << 16); 715 cmd->scsi_done(cmd); 716 return 0; 717 } 718 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 719 720 cmd->result = 0; 721 722 spin_lock_irqsave(&hostdata->lock, flags); 723 724 /* 725 * Insert the cmd into the issue queue. Note that REQUEST SENSE 726 * commands are added to the head of the queue since any command will 727 * clear the contingent allegiance condition that exists and the 728 * sense data is only guaranteed to be valid while the condition exists. 729 */ 730 731 if (cmd->cmnd[0] == REQUEST_SENSE) 732 list_add(&ncmd->list, &hostdata->unissued); 733 else 734 list_add_tail(&ncmd->list, &hostdata->unissued); 735 736 spin_unlock_irqrestore(&hostdata->lock, flags); 737 738 dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n", 739 cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); 740 741 /* Kick off command processing */ 742 queue_work(hostdata->work_q, &hostdata->main_task); 743 return 0; 744 } 745 746 /** 747 * dequeue_next_cmd - dequeue a command for processing 748 * @instance: the scsi host instance 749 * 750 * Priority is given to commands on the autosense queue. These commands 751 * need autosense because of a CHECK CONDITION result. 752 * 753 * Returns a command pointer if a command is found for a target that is 754 * not already busy. Otherwise returns NULL. 755 */ 756 757 static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance) 758 { 759 struct NCR5380_hostdata *hostdata = shost_priv(instance); 760 struct NCR5380_cmd *ncmd; 761 struct scsi_cmnd *cmd; 762 763 if (hostdata->sensing || list_empty(&hostdata->autosense)) { 764 list_for_each_entry(ncmd, &hostdata->unissued, list) { 765 cmd = NCR5380_to_scmd(ncmd); 766 dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n", 767 cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun); 768 769 if (!(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun))) { 770 list_del(&ncmd->list); 771 dsprintk(NDEBUG_QUEUES, instance, 772 "dequeue: removed %p from issue queue\n", cmd); 773 return cmd; 774 } 775 } 776 } else { 777 /* Autosense processing begins here */ 778 ncmd = list_first_entry(&hostdata->autosense, 779 struct NCR5380_cmd, list); 780 list_del(&ncmd->list); 781 cmd = NCR5380_to_scmd(ncmd); 782 dsprintk(NDEBUG_QUEUES, instance, 783 "dequeue: removed %p from autosense queue\n", cmd); 784 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); 785 hostdata->sensing = cmd; 786 return cmd; 787 } 788 return NULL; 789 } 790 791 static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd) 792 { 793 struct NCR5380_hostdata *hostdata = shost_priv(instance); 794 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); 795 796 if (hostdata->sensing == cmd) { 797 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 798 list_add(&ncmd->list, &hostdata->autosense); 799 hostdata->sensing = NULL; 800 } else 801 list_add(&ncmd->list, &hostdata->unissued); 802 } 803 804 /** 805 * NCR5380_main - NCR state machines 806 * 807 * NCR5380_main is a coroutine that runs as long as more work can 808 * be done on the NCR5380 host adapters in a system. Both 809 * NCR5380_queue_command() and NCR5380_intr() will try to start it 810 * in case it is not running. 811 */ 812 813 static void NCR5380_main(struct work_struct *work) 814 { 815 struct NCR5380_hostdata *hostdata = 816 container_of(work, struct NCR5380_hostdata, main_task); 817 struct Scsi_Host *instance = hostdata->host; 818 int done; 819 820 do { 821 done = 1; 822 823 spin_lock_irq(&hostdata->lock); 824 while (!hostdata->connected && !hostdata->selecting) { 825 struct scsi_cmnd *cmd = dequeue_next_cmd(instance); 826 827 if (!cmd) 828 break; 829 830 dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd); 831 832 /* 833 * Attempt to establish an I_T_L nexus here. 834 * On success, instance->hostdata->connected is set. 835 * On failure, we must add the command back to the 836 * issue queue so we can keep trying. 837 */ 838 /* 839 * REQUEST SENSE commands are issued without tagged 840 * queueing, even on SCSI-II devices because the 841 * contingent allegiance condition exists for the 842 * entire unit. 843 */ 844 845 if (!NCR5380_select(instance, cmd)) { 846 dsprintk(NDEBUG_MAIN, instance, "main: select complete\n"); 847 } else { 848 dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance, 849 "main: select failed, returning %p to queue\n", cmd); 850 requeue_cmd(instance, cmd); 851 } 852 } 853 if (hostdata->connected 854 #ifdef REAL_DMA 855 && !hostdata->dmalen 856 #endif 857 ) { 858 dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n"); 859 NCR5380_information_transfer(instance); 860 done = 0; 861 } 862 spin_unlock_irq(&hostdata->lock); 863 if (!done) 864 cond_resched(); 865 } while (!done); 866 } 867 868 #ifndef DONT_USE_INTR 869 870 /** 871 * NCR5380_intr - generic NCR5380 irq handler 872 * @irq: interrupt number 873 * @dev_id: device info 874 * 875 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 876 * from the disconnected queue, and restarting NCR5380_main() 877 * as required. 878 * 879 * The chip can assert IRQ in any of six different conditions. The IRQ flag 880 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR). 881 * Three of these six conditions are latched in the Bus and Status Register: 882 * - End of DMA (cleared by ending DMA Mode) 883 * - Parity error (cleared by reading RPIR) 884 * - Loss of BSY (cleared by reading RPIR) 885 * Two conditions have flag bits that are not latched: 886 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode) 887 * - Bus reset (non-maskable) 888 * The remaining condition has no flag bit at all: 889 * - Selection/reselection 890 * 891 * Hence, establishing the cause(s) of any interrupt is partly guesswork. 892 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor 893 * claimed that "the design of the [DP8490] interrupt logic ensures 894 * interrupts will not be lost (they can be on the DP5380)." 895 * The L5380/53C80 datasheet from LOGIC Devices has more details. 896 * 897 * Checking for bus reset by reading RST is futile because of interrupt 898 * latency, but a bus reset will reset chip logic. Checking for parity error 899 * is unnecessary because that interrupt is never enabled. A Loss of BSY 900 * condition will clear DMA Mode. We can tell when this occurs because the 901 * the Busy Monitor interrupt is enabled together with DMA Mode. 902 */ 903 904 static irqreturn_t NCR5380_intr(int irq, void *dev_id) 905 { 906 struct Scsi_Host *instance = dev_id; 907 struct NCR5380_hostdata *hostdata = shost_priv(instance); 908 int handled = 0; 909 unsigned char basr; 910 unsigned long flags; 911 912 spin_lock_irqsave(&hostdata->lock, flags); 913 914 basr = NCR5380_read(BUS_AND_STATUS_REG); 915 if (basr & BASR_IRQ) { 916 unsigned char mr = NCR5380_read(MODE_REG); 917 unsigned char sr = NCR5380_read(STATUS_REG); 918 919 dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n", 920 irq, basr, sr, mr); 921 922 #if defined(REAL_DMA) 923 if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) { 924 /* Probably End of DMA, Phase Mismatch or Loss of BSY. 925 * We ack IRQ after clearing Mode Register. Workarounds 926 * for End of DMA errata need to happen in DMA Mode. 927 */ 928 929 dsprintk(NDEBUG_INTR, instance, "interrupt in DMA mode\n"); 930 931 int transferred; 932 933 if (!hostdata->connected) 934 panic("scsi%d : DMA interrupt with no connected cmd\n", 935 instance->hostno); 936 937 transferred = hostdata->dmalen - NCR5380_dma_residual(instance); 938 hostdata->connected->SCp.this_residual -= transferred; 939 hostdata->connected->SCp.ptr += transferred; 940 hostdata->dmalen = 0; 941 942 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 943 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2 * HZ); 944 945 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 946 NCR5380_write(MODE_REG, MR_BASE); 947 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 948 } else 949 #endif /* REAL_DMA */ 950 if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) && 951 (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) { 952 /* Probably reselected */ 953 NCR5380_write(SELECT_ENABLE_REG, 0); 954 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 955 956 dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n"); 957 958 if (!hostdata->connected) { 959 NCR5380_reselect(instance); 960 queue_work(hostdata->work_q, &hostdata->main_task); 961 } 962 if (!hostdata->connected) 963 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 964 } else { 965 /* Probably Bus Reset */ 966 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 967 968 dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n"); 969 } 970 handled = 1; 971 } else { 972 shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n"); 973 } 974 975 spin_unlock_irqrestore(&hostdata->lock, flags); 976 977 return IRQ_RETVAL(handled); 978 } 979 980 #endif 981 982 /* 983 * Function : int NCR5380_select(struct Scsi_Host *instance, 984 * struct scsi_cmnd *cmd) 985 * 986 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 987 * including ARBITRATION, SELECTION, and initial message out for 988 * IDENTIFY and queue messages. 989 * 990 * Inputs : instance - instantiation of the 5380 driver on which this 991 * target lives, cmd - SCSI command to execute. 992 * 993 * Returns cmd if selection failed but should be retried, 994 * NULL if selection failed and should not be retried, or 995 * NULL if selection succeeded (hostdata->connected == cmd). 996 * 997 * Side effects : 998 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 999 * with registers as they should have been on entry - ie 1000 * SELECT_ENABLE will be set appropriately, the NCR5380 1001 * will cease to drive any SCSI bus signals. 1002 * 1003 * If successful : I_T_L or I_T_L_Q nexus will be established, 1004 * instance->connected will be set to cmd. 1005 * SELECT interrupt will be disabled. 1006 * 1007 * If failed (no target) : cmd->scsi_done() will be called, and the 1008 * cmd->result host byte set to DID_BAD_TARGET. 1009 */ 1010 1011 static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance, 1012 struct scsi_cmnd *cmd) 1013 { 1014 struct NCR5380_hostdata *hostdata = shost_priv(instance); 1015 unsigned char tmp[3], phase; 1016 unsigned char *data; 1017 int len; 1018 int err; 1019 1020 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1021 dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n", 1022 instance->this_id); 1023 1024 /* 1025 * Arbitration and selection phases are slow and involve dropping the 1026 * lock, so we have to watch out for EH. An exception handler may 1027 * change 'selecting' to NULL. This function will then return NULL 1028 * so that the caller will forget about 'cmd'. (During information 1029 * transfer phases, EH may change 'connected' to NULL.) 1030 */ 1031 hostdata->selecting = cmd; 1032 1033 /* 1034 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1035 * data bus during SELECTION. 1036 */ 1037 1038 NCR5380_write(TARGET_COMMAND_REG, 0); 1039 1040 /* 1041 * Start arbitration. 1042 */ 1043 1044 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1045 NCR5380_write(MODE_REG, MR_ARBITRATE); 1046 1047 /* The chip now waits for BUS FREE phase. Then after the 800 ns 1048 * Bus Free Delay, arbitration will begin. 1049 */ 1050 1051 spin_unlock_irq(&hostdata->lock); 1052 err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0, 1053 INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, 1054 ICR_ARBITRATION_PROGRESS, HZ); 1055 spin_lock_irq(&hostdata->lock); 1056 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) { 1057 /* Reselection interrupt */ 1058 goto out; 1059 } 1060 if (!hostdata->selecting) { 1061 /* Command was aborted */ 1062 NCR5380_write(MODE_REG, MR_BASE); 1063 goto out; 1064 } 1065 if (err < 0) { 1066 NCR5380_write(MODE_REG, MR_BASE); 1067 shost_printk(KERN_ERR, instance, 1068 "select: arbitration timeout\n"); 1069 goto out; 1070 } 1071 spin_unlock_irq(&hostdata->lock); 1072 1073 /* The SCSI-2 arbitration delay is 2.4 us */ 1074 udelay(3); 1075 1076 /* Check for lost arbitration */ 1077 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1078 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || 1079 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1080 NCR5380_write(MODE_REG, MR_BASE); 1081 dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n"); 1082 spin_lock_irq(&hostdata->lock); 1083 goto out; 1084 } 1085 1086 /* After/during arbitration, BSY should be asserted. 1087 * IBM DPES-31080 Version S31Q works now 1088 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) 1089 */ 1090 NCR5380_write(INITIATOR_COMMAND_REG, 1091 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); 1092 1093 /* 1094 * Again, bus clear + bus settle time is 1.2us, however, this is 1095 * a minimum so we'll udelay ceil(1.2) 1096 */ 1097 1098 if (hostdata->flags & FLAG_TOSHIBA_DELAY) 1099 udelay(15); 1100 else 1101 udelay(2); 1102 1103 spin_lock_irq(&hostdata->lock); 1104 1105 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */ 1106 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) 1107 goto out; 1108 1109 if (!hostdata->selecting) { 1110 NCR5380_write(MODE_REG, MR_BASE); 1111 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1112 goto out; 1113 } 1114 1115 dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n"); 1116 1117 /* 1118 * Now that we have won arbitration, start Selection process, asserting 1119 * the host and target ID's on the SCSI bus. 1120 */ 1121 1122 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask | (1 << scmd_id(cmd))); 1123 1124 /* 1125 * Raise ATN while SEL is true before BSY goes false from arbitration, 1126 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1127 * phase immediately after selection. 1128 */ 1129 1130 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY | 1131 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL); 1132 NCR5380_write(MODE_REG, MR_BASE); 1133 1134 /* 1135 * Reselect interrupts must be turned off prior to the dropping of BSY, 1136 * otherwise we will trigger an interrupt. 1137 */ 1138 NCR5380_write(SELECT_ENABLE_REG, 0); 1139 1140 spin_unlock_irq(&hostdata->lock); 1141 1142 /* 1143 * The initiator shall then wait at least two deskew delays and release 1144 * the BSY signal. 1145 */ 1146 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1147 1148 /* Reset BSY */ 1149 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | 1150 ICR_ASSERT_ATN | ICR_ASSERT_SEL); 1151 1152 /* 1153 * Something weird happens when we cease to drive BSY - looks 1154 * like the board/chip is letting us do another read before the 1155 * appropriate propagation delay has expired, and we're confusing 1156 * a BSY signal from ourselves as the target's response to SELECTION. 1157 * 1158 * A small delay (the 'C++' frontend breaks the pipeline with an 1159 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1160 * tighter 'C' code breaks and requires this) solves the problem - 1161 * the 1 us delay is arbitrary, and only used because this delay will 1162 * be the same on other platforms and since it works here, it should 1163 * work there. 1164 * 1165 * wingel suggests that this could be due to failing to wait 1166 * one deskew delay. 1167 */ 1168 1169 udelay(1); 1170 1171 dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd)); 1172 1173 /* 1174 * The SCSI specification calls for a 250 ms timeout for the actual 1175 * selection. 1176 */ 1177 1178 err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY, 1179 msecs_to_jiffies(250)); 1180 1181 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1182 spin_lock_irq(&hostdata->lock); 1183 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1184 NCR5380_reselect(instance); 1185 if (!hostdata->connected) 1186 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1187 shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n"); 1188 goto out; 1189 } 1190 1191 if (err < 0) { 1192 spin_lock_irq(&hostdata->lock); 1193 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1194 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1195 /* Can't touch cmd if it has been reclaimed by the scsi ML */ 1196 if (hostdata->selecting) { 1197 cmd->result = DID_BAD_TARGET << 16; 1198 complete_cmd(instance, cmd); 1199 dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n"); 1200 cmd = NULL; 1201 } 1202 goto out; 1203 } 1204 1205 /* 1206 * No less than two deskew delays after the initiator detects the 1207 * BSY signal is true, it shall release the SEL signal and may 1208 * change the DATA BUS. -wingel 1209 */ 1210 1211 udelay(1); 1212 1213 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1214 1215 /* 1216 * Since we followed the SCSI spec, and raised ATN while SEL 1217 * was true but before BSY was false during selection, the information 1218 * transfer phase should be a MESSAGE OUT phase so that we can send the 1219 * IDENTIFY message. 1220 * 1221 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1222 * message (2 bytes) with a tag ID that we increment with every command 1223 * until it wraps back to 0. 1224 * 1225 * XXX - it turns out that there are some broken SCSI-II devices, 1226 * which claim to support tagged queuing but fail when more than 1227 * some number of commands are issued at once. 1228 */ 1229 1230 /* Wait for start of REQ/ACK handshake */ 1231 1232 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1233 spin_lock_irq(&hostdata->lock); 1234 if (err < 0) { 1235 shost_printk(KERN_ERR, instance, "select: REQ timeout\n"); 1236 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1237 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1238 goto out; 1239 } 1240 if (!hostdata->selecting) { 1241 do_abort(instance); 1242 goto out; 1243 } 1244 1245 dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n", 1246 scmd_id(cmd)); 1247 tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun); 1248 1249 len = 1; 1250 cmd->tag = 0; 1251 1252 /* Send message(s) */ 1253 data = tmp; 1254 phase = PHASE_MSGOUT; 1255 NCR5380_transfer_pio(instance, &phase, &len, &data); 1256 dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n"); 1257 /* XXX need to handle errors here */ 1258 1259 hostdata->connected = cmd; 1260 hostdata->busy[cmd->device->id] |= 1 << cmd->device->lun; 1261 1262 initialize_SCp(cmd); 1263 1264 cmd = NULL; 1265 1266 out: 1267 if (!hostdata->selecting) 1268 return NULL; 1269 hostdata->selecting = NULL; 1270 return cmd; 1271 } 1272 1273 /* 1274 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1275 * unsigned char *phase, int *count, unsigned char **data) 1276 * 1277 * Purpose : transfers data in given phase using polled I/O 1278 * 1279 * Inputs : instance - instance of driver, *phase - pointer to 1280 * what phase is expected, *count - pointer to number of 1281 * bytes to transfer, **data - pointer to data pointer. 1282 * 1283 * Returns : -1 when different phase is entered without transferring 1284 * maximum number of bytes, 0 if all bytes are transferred or exit 1285 * is in same phase. 1286 * 1287 * Also, *phase, *count, *data are modified in place. 1288 * 1289 * XXX Note : handling for bus free may be useful. 1290 */ 1291 1292 /* 1293 * Note : this code is not as quick as it could be, however it 1294 * IS 100% reliable, and for the actual data transfer where speed 1295 * counts, we will always do a pseudo DMA or DMA transfer. 1296 */ 1297 1298 static int NCR5380_transfer_pio(struct Scsi_Host *instance, 1299 unsigned char *phase, int *count, 1300 unsigned char **data) 1301 { 1302 unsigned char p = *phase, tmp; 1303 int c = *count; 1304 unsigned char *d = *data; 1305 1306 /* 1307 * The NCR5380 chip will only drive the SCSI bus when the 1308 * phase specified in the appropriate bits of the TARGET COMMAND 1309 * REGISTER match the STATUS REGISTER 1310 */ 1311 1312 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1313 1314 do { 1315 /* 1316 * Wait for assertion of REQ, after which the phase bits will be 1317 * valid 1318 */ 1319 1320 if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0) 1321 break; 1322 1323 dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n"); 1324 1325 /* Check for phase mismatch */ 1326 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) { 1327 dsprintk(NDEBUG_PIO, instance, "phase mismatch\n"); 1328 NCR5380_dprint_phase(NDEBUG_PIO, instance); 1329 break; 1330 } 1331 1332 /* Do actual transfer from SCSI bus to / from memory */ 1333 if (!(p & SR_IO)) 1334 NCR5380_write(OUTPUT_DATA_REG, *d); 1335 else 1336 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1337 1338 ++d; 1339 1340 /* 1341 * The SCSI standard suggests that in MSGOUT phase, the initiator 1342 * should drop ATN on the last byte of the message phase 1343 * after REQ has been asserted for the handshake but before 1344 * the initiator raises ACK. 1345 */ 1346 1347 if (!(p & SR_IO)) { 1348 if (!((p & SR_MSG) && c > 1)) { 1349 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1350 NCR5380_dprint(NDEBUG_PIO, instance); 1351 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1352 ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1353 } else { 1354 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1355 ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1356 NCR5380_dprint(NDEBUG_PIO, instance); 1357 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1358 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1359 } 1360 } else { 1361 NCR5380_dprint(NDEBUG_PIO, instance); 1362 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1363 } 1364 1365 if (NCR5380_poll_politely(instance, 1366 STATUS_REG, SR_REQ, 0, 5 * HZ) < 0) 1367 break; 1368 1369 dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n"); 1370 1371 /* 1372 * We have several special cases to consider during REQ/ACK handshaking : 1373 * 1. We were in MSGOUT phase, and we are on the last byte of the 1374 * message. ATN must be dropped as ACK is dropped. 1375 * 1376 * 2. We are in a MSGIN phase, and we are on the last byte of the 1377 * message. We must exit with ACK asserted, so that the calling 1378 * code may raise ATN before dropping ACK to reject the message. 1379 * 1380 * 3. ACK and ATN are clear and the target may proceed as normal. 1381 */ 1382 if (!(p == PHASE_MSGIN && c == 1)) { 1383 if (p == PHASE_MSGOUT && c > 1) 1384 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1385 else 1386 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1387 } 1388 } while (--c); 1389 1390 dsprintk(NDEBUG_PIO, instance, "residual %d\n", c); 1391 1392 *count = c; 1393 *data = d; 1394 tmp = NCR5380_read(STATUS_REG); 1395 /* The phase read from the bus is valid if either REQ is (already) 1396 * asserted or if ACK hasn't been released yet. The latter applies if 1397 * we're in MSG IN, DATA IN or STATUS and all bytes have been received. 1398 */ 1399 if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0)) 1400 *phase = tmp & PHASE_MASK; 1401 else 1402 *phase = PHASE_UNKNOWN; 1403 1404 if (!c || (*phase == p)) 1405 return 0; 1406 else 1407 return -1; 1408 } 1409 1410 /** 1411 * do_reset - issue a reset command 1412 * @instance: adapter to reset 1413 * 1414 * Issue a reset sequence to the NCR5380 and try and get the bus 1415 * back into sane shape. 1416 * 1417 * This clears the reset interrupt flag because there may be no handler for 1418 * it. When the driver is initialized, the NCR5380_intr() handler has not yet 1419 * been installed. And when in EH we may have released the ST DMA interrupt. 1420 */ 1421 1422 static void do_reset(struct Scsi_Host *instance) 1423 { 1424 unsigned long flags; 1425 1426 local_irq_save(flags); 1427 NCR5380_write(TARGET_COMMAND_REG, 1428 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1429 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1430 udelay(50); 1431 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1432 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1433 local_irq_restore(flags); 1434 } 1435 1436 /** 1437 * do_abort - abort the currently established nexus by going to 1438 * MESSAGE OUT phase and sending an ABORT message. 1439 * @instance: relevant scsi host instance 1440 * 1441 * Returns 0 on success, -1 on failure. 1442 */ 1443 1444 static int do_abort(struct Scsi_Host *instance) 1445 { 1446 unsigned char *msgptr, phase, tmp; 1447 int len; 1448 int rc; 1449 1450 /* Request message out phase */ 1451 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1452 1453 /* 1454 * Wait for the target to indicate a valid phase by asserting 1455 * REQ. Once this happens, we'll have either a MSGOUT phase 1456 * and can immediately send the ABORT message, or we'll have some 1457 * other phase and will have to source/sink data. 1458 * 1459 * We really don't care what value was on the bus or what value 1460 * the target sees, so we just handshake. 1461 */ 1462 1463 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ); 1464 if (rc < 0) 1465 goto timeout; 1466 1467 tmp = NCR5380_read(STATUS_REG) & PHASE_MASK; 1468 1469 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1470 1471 if (tmp != PHASE_MSGOUT) { 1472 NCR5380_write(INITIATOR_COMMAND_REG, 1473 ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1474 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ); 1475 if (rc < 0) 1476 goto timeout; 1477 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1478 } 1479 1480 tmp = ABORT; 1481 msgptr = &tmp; 1482 len = 1; 1483 phase = PHASE_MSGOUT; 1484 NCR5380_transfer_pio(instance, &phase, &len, &msgptr); 1485 1486 /* 1487 * If we got here, and the command completed successfully, 1488 * we're about to go into bus free state. 1489 */ 1490 1491 return len ? -1 : 0; 1492 1493 timeout: 1494 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1495 return -1; 1496 } 1497 1498 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1499 /* 1500 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1501 * unsigned char *phase, int *count, unsigned char **data) 1502 * 1503 * Purpose : transfers data in given phase using either real 1504 * or pseudo DMA. 1505 * 1506 * Inputs : instance - instance of driver, *phase - pointer to 1507 * what phase is expected, *count - pointer to number of 1508 * bytes to transfer, **data - pointer to data pointer. 1509 * 1510 * Returns : -1 when different phase is entered without transferring 1511 * maximum number of bytes, 0 if all bytes or transferred or exit 1512 * is in same phase. 1513 * 1514 * Also, *phase, *count, *data are modified in place. 1515 */ 1516 1517 1518 static int NCR5380_transfer_dma(struct Scsi_Host *instance, 1519 unsigned char *phase, int *count, 1520 unsigned char **data) 1521 { 1522 struct NCR5380_hostdata *hostdata = shost_priv(instance); 1523 register int c = *count; 1524 register unsigned char p = *phase; 1525 register unsigned char *d = *data; 1526 unsigned char tmp; 1527 int foo; 1528 #if defined(REAL_DMA_POLL) 1529 int cnt, toPIO; 1530 unsigned char saved_data = 0, overrun = 0, residue; 1531 #endif 1532 1533 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1534 *phase = tmp; 1535 return -1; 1536 } 1537 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1538 if (p & SR_IO) { 1539 if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS)) 1540 c -= 2; 1541 } 1542 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1543 1544 dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n", 1545 (p & SR_IO) ? "receive" : "send", c, *data); 1546 #endif 1547 1548 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1549 1550 #ifdef REAL_DMA 1551 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | 1552 MR_ENABLE_EOP_INTR); 1553 #elif defined(REAL_DMA_POLL) 1554 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); 1555 #else 1556 /* 1557 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1558 * were not disabled for the duration of a single DMA transfer, from 1559 * before the setting of DMA mode to after transfer of the last byte. 1560 */ 1561 1562 if (hostdata->flags & FLAG_NO_DMA_FIXUP) 1563 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY | 1564 MR_ENABLE_EOP_INTR); 1565 else 1566 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY); 1567 #endif /* def REAL_DMA */ 1568 1569 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); 1570 1571 /* 1572 * On the PAS16 at least I/O recovery delays are not needed here. 1573 * Everyone else seems to want them. 1574 */ 1575 1576 if (p & SR_IO) { 1577 io_recovery_delay(1); 1578 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1579 } else { 1580 io_recovery_delay(1); 1581 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1582 io_recovery_delay(1); 1583 NCR5380_write(START_DMA_SEND_REG, 0); 1584 io_recovery_delay(1); 1585 } 1586 1587 #if defined(REAL_DMA_POLL) 1588 do { 1589 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1590 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1591 1592 /* 1593 * At this point, either we've completed DMA, or we have a phase mismatch, 1594 * or we've unexpectedly lost BUSY (which is a real error). 1595 * 1596 * For DMA sends, we want to wait until the last byte has been 1597 * transferred out over the bus before we turn off DMA mode. Alas, there 1598 * seems to be no terribly good way of doing this on a 5380 under all 1599 * conditions. For non-scatter-gather operations, we can wait until REQ 1600 * and ACK both go false, or until a phase mismatch occurs. Gather-sends 1601 * are nastier, since the device will be expecting more data than we 1602 * are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1603 * could test Last Byte Sent to assure transfer (I imagine this is precisely 1604 * why this signal was added to the newer chips) but on the older 538[01] 1605 * this signal does not exist. The workaround for this lack is a watchdog; 1606 * we bail out of the wait-loop after a modest amount of wait-time if 1607 * the usual exit conditions are not met. Not a terribly clean or 1608 * correct solution :-% 1609 * 1610 * DMA receive is equally tricky due to a nasty characteristic of the NCR5380. 1611 * If the chip is in DMA receive mode, it will respond to a target's 1612 * REQ by latching the SCSI data into the INPUT DATA register and asserting 1613 * ACK, even if it has _already_ been notified by the DMA controller that 1614 * the current DMA transfer has completed! If the NCR5380 is then taken 1615 * out of DMA mode, this already-acknowledged byte is lost. This is 1616 * not a problem for "one DMA transfer per READ command", because 1617 * the situation will never arise... either all of the data is DMA'ed 1618 * properly, or the target switches to MESSAGE IN phase to signal a 1619 * disconnection (either operation bringing the DMA to a clean halt). 1620 * However, in order to handle scatter-receive, we must work around the 1621 * problem. The chosen fix is to DMA N-2 bytes, then check for the 1622 * condition before taking the NCR5380 out of DMA mode. One or two extra 1623 * bytes are transferred via PIO as necessary to fill out the original 1624 * request. 1625 */ 1626 1627 if (p & SR_IO) { 1628 if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS)) { 1629 udelay(10); 1630 if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == 1631 (BASR_PHASE_MATCH | BASR_ACK)) { 1632 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1633 overrun = 1; 1634 } 1635 } 1636 } else { 1637 int limit = 100; 1638 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1639 if (!(tmp & BASR_PHASE_MATCH)) 1640 break; 1641 if (--limit < 0) 1642 break; 1643 } 1644 } 1645 1646 dsprintk(NDEBUG_DMA, "polled DMA transfer complete, basr 0x%02x, sr 0x%02x\n", 1647 tmp, NCR5380_read(STATUS_REG)); 1648 1649 NCR5380_write(MODE_REG, MR_BASE); 1650 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1651 1652 residue = NCR5380_dma_residual(instance); 1653 c -= residue; 1654 *count -= c; 1655 *data += c; 1656 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1657 1658 if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS) && 1659 *phase == p && (p & SR_IO) && residue == 0) { 1660 if (overrun) { 1661 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); 1662 **data = saved_data; 1663 *data += 1; 1664 *count -= 1; 1665 cnt = toPIO = 1; 1666 } else { 1667 printk("No overrun??\n"); 1668 cnt = toPIO = 2; 1669 } 1670 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data); 1671 NCR5380_transfer_pio(instance, phase, &cnt, data); 1672 *count -= toPIO - cnt; 1673 } 1674 1675 dprintk(NDEBUG_DMA, "Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count)); 1676 return 0; 1677 1678 #elif defined(REAL_DMA) 1679 return 0; 1680 #else /* defined(REAL_DMA_POLL) */ 1681 if (p & SR_IO) { 1682 foo = NCR5380_pread(instance, d, 1683 hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1); 1684 if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { 1685 /* 1686 * We can't disable DMA mode after successfully transferring 1687 * what we plan to be the last byte, since that would open up 1688 * a race condition where if the target asserted REQ before 1689 * we got the DMA mode reset, the NCR5380 would have latched 1690 * an additional byte into the INPUT DATA register and we'd 1691 * have dropped it. 1692 * 1693 * The workaround was to transfer one fewer bytes than we 1694 * intended to with the pseudo-DMA read function, wait for 1695 * the chip to latch the last byte, read it, and then disable 1696 * pseudo-DMA mode. 1697 * 1698 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 1699 * REQ is deasserted when ACK is asserted, and not reasserted 1700 * until ACK goes false. Since the NCR5380 won't lower ACK 1701 * until DACK is asserted, which won't happen unless we twiddle 1702 * the DMA port or we take the NCR5380 out of DMA mode, we 1703 * can guarantee that we won't handshake another extra 1704 * byte. 1705 */ 1706 1707 if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, 1708 BASR_DRQ, BASR_DRQ, HZ) < 0) { 1709 foo = -1; 1710 shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n"); 1711 } 1712 if (NCR5380_poll_politely(instance, STATUS_REG, 1713 SR_REQ, 0, HZ) < 0) { 1714 foo = -1; 1715 shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n"); 1716 } 1717 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 1718 } 1719 } else { 1720 foo = NCR5380_pwrite(instance, d, c); 1721 if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) { 1722 /* 1723 * Wait for the last byte to be sent. If REQ is being asserted for 1724 * the byte we're interested, we'll ACK it and it will go false. 1725 */ 1726 if (NCR5380_poll_politely2(instance, 1727 BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ, 1728 BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) { 1729 foo = -1; 1730 shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n"); 1731 } 1732 } 1733 } 1734 NCR5380_write(MODE_REG, MR_BASE); 1735 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1736 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1737 *data = d + c; 1738 *count = 0; 1739 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1740 return foo; 1741 #endif /* def REAL_DMA */ 1742 } 1743 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 1744 1745 /* 1746 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 1747 * 1748 * Purpose : run through the various SCSI phases and do as the target 1749 * directs us to. Operates on the currently connected command, 1750 * instance->connected. 1751 * 1752 * Inputs : instance, instance for which we are doing commands 1753 * 1754 * Side effects : SCSI things happen, the disconnected queue will be 1755 * modified if a command disconnects, *instance->connected will 1756 * change. 1757 * 1758 * XXX Note : we need to watch for bus free or a reset condition here 1759 * to recover from an unexpected bus free condition. 1760 */ 1761 1762 static void NCR5380_information_transfer(struct Scsi_Host *instance) 1763 { 1764 struct NCR5380_hostdata *hostdata = shost_priv(instance); 1765 unsigned char msgout = NOP; 1766 int sink = 0; 1767 int len; 1768 int transfersize; 1769 unsigned char *data; 1770 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 1771 struct scsi_cmnd *cmd; 1772 1773 while ((cmd = hostdata->connected)) { 1774 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd); 1775 1776 tmp = NCR5380_read(STATUS_REG); 1777 /* We only have a valid SCSI phase when REQ is asserted */ 1778 if (tmp & SR_REQ) { 1779 phase = (tmp & PHASE_MASK); 1780 if (phase != old_phase) { 1781 old_phase = phase; 1782 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 1783 } 1784 if (sink && (phase != PHASE_MSGOUT)) { 1785 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1786 1787 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 1788 ICR_ASSERT_ACK); 1789 while (NCR5380_read(STATUS_REG) & SR_REQ) 1790 ; 1791 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1792 ICR_ASSERT_ATN); 1793 sink = 0; 1794 continue; 1795 } 1796 1797 switch (phase) { 1798 case PHASE_DATAOUT: 1799 #if (NDEBUG & NDEBUG_NO_DATAOUT) 1800 shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n"); 1801 sink = 1; 1802 do_abort(instance); 1803 cmd->result = DID_ERROR << 16; 1804 complete_cmd(instance, cmd); 1805 hostdata->connected = NULL; 1806 return; 1807 #endif 1808 case PHASE_DATAIN: 1809 /* 1810 * If there is no room left in the current buffer in the 1811 * scatter-gather list, move onto the next one. 1812 */ 1813 1814 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 1815 ++cmd->SCp.buffer; 1816 --cmd->SCp.buffers_residual; 1817 cmd->SCp.this_residual = cmd->SCp.buffer->length; 1818 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 1819 dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n", 1820 cmd->SCp.this_residual, 1821 cmd->SCp.buffers_residual); 1822 } 1823 1824 /* 1825 * The preferred transfer method is going to be 1826 * PSEUDO-DMA for systems that are strictly PIO, 1827 * since we can let the hardware do the handshaking. 1828 * 1829 * For this to work, we need to know the transfersize 1830 * ahead of time, since the pseudo-DMA code will sit 1831 * in an unconditional loop. 1832 */ 1833 1834 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 1835 transfersize = 0; 1836 if (!cmd->device->borken && 1837 !(hostdata->flags & FLAG_NO_PSEUDO_DMA)) 1838 transfersize = NCR5380_dma_xfer_len(instance, cmd, phase); 1839 1840 if (transfersize) { 1841 len = transfersize; 1842 if (NCR5380_transfer_dma(instance, &phase, 1843 &len, (unsigned char **)&cmd->SCp.ptr)) { 1844 /* 1845 * If the watchdog timer fires, all future 1846 * accesses to this device will use the 1847 * polled-IO. 1848 */ 1849 scmd_printk(KERN_INFO, cmd, 1850 "switching to slow handshake\n"); 1851 cmd->device->borken = 1; 1852 sink = 1; 1853 do_abort(instance); 1854 cmd->result = DID_ERROR << 16; 1855 /* XXX - need to source or sink data here, as appropriate */ 1856 } else 1857 cmd->SCp.this_residual -= transfersize - len; 1858 } else 1859 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 1860 { 1861 /* Break up transfer into 3 ms chunks, 1862 * presuming 6 accesses per handshake. 1863 */ 1864 transfersize = min((unsigned long)cmd->SCp.this_residual, 1865 hostdata->accesses_per_ms / 2); 1866 len = transfersize; 1867 NCR5380_transfer_pio(instance, &phase, &len, 1868 (unsigned char **)&cmd->SCp.ptr); 1869 cmd->SCp.this_residual -= transfersize - len; 1870 } 1871 return; 1872 case PHASE_MSGIN: 1873 len = 1; 1874 data = &tmp; 1875 NCR5380_transfer_pio(instance, &phase, &len, &data); 1876 cmd->SCp.Message = tmp; 1877 1878 switch (tmp) { 1879 case ABORT: 1880 case COMMAND_COMPLETE: 1881 /* Accept message by clearing ACK */ 1882 sink = 1; 1883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1884 dsprintk(NDEBUG_QUEUES, instance, 1885 "COMMAND COMPLETE %p target %d lun %llu\n", 1886 cmd, scmd_id(cmd), cmd->device->lun); 1887 1888 hostdata->connected = NULL; 1889 1890 cmd->result &= ~0xffff; 1891 cmd->result |= cmd->SCp.Status; 1892 cmd->result |= cmd->SCp.Message << 8; 1893 1894 if (cmd->cmnd[0] == REQUEST_SENSE) 1895 complete_cmd(instance, cmd); 1896 else { 1897 if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION || 1898 cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) { 1899 dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n", 1900 cmd); 1901 list_add_tail(&ncmd->list, 1902 &hostdata->autosense); 1903 } else 1904 complete_cmd(instance, cmd); 1905 } 1906 1907 /* 1908 * Restore phase bits to 0 so an interrupted selection, 1909 * arbitration can resume. 1910 */ 1911 NCR5380_write(TARGET_COMMAND_REG, 0); 1912 1913 /* Enable reselect interrupts */ 1914 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1915 return; 1916 case MESSAGE_REJECT: 1917 /* Accept message by clearing ACK */ 1918 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1919 switch (hostdata->last_message) { 1920 case HEAD_OF_QUEUE_TAG: 1921 case ORDERED_QUEUE_TAG: 1922 case SIMPLE_QUEUE_TAG: 1923 cmd->device->simple_tags = 0; 1924 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); 1925 break; 1926 default: 1927 break; 1928 } 1929 break; 1930 case DISCONNECT: 1931 /* Accept message by clearing ACK */ 1932 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1933 hostdata->connected = NULL; 1934 list_add(&ncmd->list, &hostdata->disconnected); 1935 dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES, 1936 instance, "connected command %p for target %d lun %llu moved to disconnected queue\n", 1937 cmd, scmd_id(cmd), cmd->device->lun); 1938 1939 /* 1940 * Restore phase bits to 0 so an interrupted selection, 1941 * arbitration can resume. 1942 */ 1943 NCR5380_write(TARGET_COMMAND_REG, 0); 1944 1945 /* Enable reselect interrupts */ 1946 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1947 return; 1948 /* 1949 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 1950 * operation, in violation of the SCSI spec so we can safely 1951 * ignore SAVE/RESTORE pointers calls. 1952 * 1953 * Unfortunately, some disks violate the SCSI spec and 1954 * don't issue the required SAVE_POINTERS message before 1955 * disconnecting, and we have to break spec to remain 1956 * compatible. 1957 */ 1958 case SAVE_POINTERS: 1959 case RESTORE_POINTERS: 1960 /* Accept message by clearing ACK */ 1961 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1962 break; 1963 case EXTENDED_MESSAGE: 1964 /* 1965 * Start the message buffer with the EXTENDED_MESSAGE 1966 * byte, since spi_print_msg() wants the whole thing. 1967 */ 1968 extended_msg[0] = EXTENDED_MESSAGE; 1969 /* Accept first byte by clearing ACK */ 1970 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1971 1972 spin_unlock_irq(&hostdata->lock); 1973 1974 dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n"); 1975 1976 len = 2; 1977 data = extended_msg + 1; 1978 phase = PHASE_MSGIN; 1979 NCR5380_transfer_pio(instance, &phase, &len, &data); 1980 dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n", 1981 (int)extended_msg[1], 1982 (int)extended_msg[2]); 1983 1984 if (!len && extended_msg[1] > 0 && 1985 extended_msg[1] <= sizeof(extended_msg) - 2) { 1986 /* Accept third byte by clearing ACK */ 1987 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1988 len = extended_msg[1] - 1; 1989 data = extended_msg + 3; 1990 phase = PHASE_MSGIN; 1991 1992 NCR5380_transfer_pio(instance, &phase, &len, &data); 1993 dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n", 1994 len); 1995 1996 switch (extended_msg[2]) { 1997 case EXTENDED_SDTR: 1998 case EXTENDED_WDTR: 1999 case EXTENDED_MODIFY_DATA_POINTER: 2000 case EXTENDED_EXTENDED_IDENTIFY: 2001 tmp = 0; 2002 } 2003 } else if (len) { 2004 shost_printk(KERN_ERR, instance, "error receiving extended message\n"); 2005 tmp = 0; 2006 } else { 2007 shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n", 2008 extended_msg[2], extended_msg[1]); 2009 tmp = 0; 2010 } 2011 2012 spin_lock_irq(&hostdata->lock); 2013 if (!hostdata->connected) 2014 return; 2015 2016 /* Fall through to reject message */ 2017 2018 /* 2019 * If we get something weird that we aren't expecting, 2020 * reject it. 2021 */ 2022 default: 2023 if (!tmp) { 2024 shost_printk(KERN_ERR, instance, "rejecting message "); 2025 spi_print_msg(extended_msg); 2026 printk("\n"); 2027 } else if (tmp != EXTENDED_MESSAGE) 2028 scmd_printk(KERN_INFO, cmd, 2029 "rejecting unknown message %02x\n", 2030 tmp); 2031 else 2032 scmd_printk(KERN_INFO, cmd, 2033 "rejecting unknown extended message code %02x, length %d\n", 2034 extended_msg[1], extended_msg[0]); 2035 2036 msgout = MESSAGE_REJECT; 2037 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2038 break; 2039 } /* switch (tmp) */ 2040 break; 2041 case PHASE_MSGOUT: 2042 len = 1; 2043 data = &msgout; 2044 hostdata->last_message = msgout; 2045 NCR5380_transfer_pio(instance, &phase, &len, &data); 2046 if (msgout == ABORT) { 2047 hostdata->connected = NULL; 2048 cmd->result = DID_ERROR << 16; 2049 complete_cmd(instance, cmd); 2050 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2051 return; 2052 } 2053 msgout = NOP; 2054 break; 2055 case PHASE_CMDOUT: 2056 len = cmd->cmd_len; 2057 data = cmd->cmnd; 2058 /* 2059 * XXX for performance reasons, on machines with a 2060 * PSEUDO-DMA architecture we should probably 2061 * use the dma transfer function. 2062 */ 2063 NCR5380_transfer_pio(instance, &phase, &len, &data); 2064 break; 2065 case PHASE_STATIN: 2066 len = 1; 2067 data = &tmp; 2068 NCR5380_transfer_pio(instance, &phase, &len, &data); 2069 cmd->SCp.Status = tmp; 2070 break; 2071 default: 2072 shost_printk(KERN_ERR, instance, "unknown phase\n"); 2073 NCR5380_dprint(NDEBUG_ANY, instance); 2074 } /* switch(phase) */ 2075 } else { 2076 spin_unlock_irq(&hostdata->lock); 2077 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 2078 spin_lock_irq(&hostdata->lock); 2079 } 2080 } 2081 } 2082 2083 /* 2084 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2085 * 2086 * Purpose : does reselection, initializing the instance->connected 2087 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q 2088 * nexus has been reestablished, 2089 * 2090 * Inputs : instance - this instance of the NCR5380. 2091 */ 2092 2093 static void NCR5380_reselect(struct Scsi_Host *instance) 2094 { 2095 struct NCR5380_hostdata *hostdata = shost_priv(instance); 2096 unsigned char target_mask; 2097 unsigned char lun, phase; 2098 int len; 2099 unsigned char msg[3]; 2100 unsigned char *data; 2101 struct NCR5380_cmd *ncmd; 2102 struct scsi_cmnd *tmp; 2103 2104 /* 2105 * Disable arbitration, etc. since the host adapter obviously 2106 * lost, and tell an interrupted NCR5380_select() to restart. 2107 */ 2108 2109 NCR5380_write(MODE_REG, MR_BASE); 2110 2111 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2112 2113 dsprintk(NDEBUG_RESELECTION, instance, "reselect\n"); 2114 2115 /* 2116 * At this point, we have detected that our SCSI ID is on the bus, 2117 * SEL is true and BSY was false for at least one bus settle delay 2118 * (400 ns). 2119 * 2120 * We must assert BSY ourselves, until the target drops the SEL 2121 * signal. 2122 */ 2123 2124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2125 if (NCR5380_poll_politely(instance, 2126 STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) { 2127 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2128 return; 2129 } 2130 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2131 2132 /* 2133 * Wait for target to go into MSGIN. 2134 */ 2135 2136 if (NCR5380_poll_politely(instance, 2137 STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) { 2138 do_abort(instance); 2139 return; 2140 } 2141 2142 len = 1; 2143 data = msg; 2144 phase = PHASE_MSGIN; 2145 NCR5380_transfer_pio(instance, &phase, &len, &data); 2146 2147 if (len) { 2148 do_abort(instance); 2149 return; 2150 } 2151 2152 if (!(msg[0] & 0x80)) { 2153 shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got "); 2154 spi_print_msg(msg); 2155 printk("\n"); 2156 do_abort(instance); 2157 return; 2158 } 2159 lun = msg[0] & 0x07; 2160 2161 /* 2162 * We need to add code for SCSI-II to track which devices have 2163 * I_T_L_Q nexuses established, and which have simple I_T_L 2164 * nexuses so we can chose to do additional data transfer. 2165 */ 2166 2167 /* 2168 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2169 * just reestablished, and remove it from the disconnected queue. 2170 */ 2171 2172 tmp = NULL; 2173 list_for_each_entry(ncmd, &hostdata->disconnected, list) { 2174 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); 2175 2176 if (target_mask == (1 << scmd_id(cmd)) && 2177 lun == (u8)cmd->device->lun) { 2178 list_del(&ncmd->list); 2179 tmp = cmd; 2180 break; 2181 } 2182 } 2183 2184 if (tmp) { 2185 dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance, 2186 "reselect: removed %p from disconnected queue\n", tmp); 2187 } else { 2188 shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n", 2189 target_mask, lun); 2190 /* 2191 * Since we have an established nexus that we can't do anything 2192 * with, we must abort it. 2193 */ 2194 do_abort(instance); 2195 return; 2196 } 2197 2198 /* Accept message by clearing ACK */ 2199 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2200 2201 hostdata->connected = tmp; 2202 dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu, tag %d\n", 2203 scmd_id(tmp), tmp->device->lun, tmp->tag); 2204 } 2205 2206 /* 2207 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2208 * 2209 * Purpose : called by interrupt handler when DMA finishes or a phase 2210 * mismatch occurs (which would finish the DMA transfer). 2211 * 2212 * Inputs : instance - this instance of the NCR5380. 2213 * 2214 * Returns : pointer to the scsi_cmnd structure for which the I_T_L 2215 * nexus has been reestablished, on failure NULL is returned. 2216 */ 2217 2218 #ifdef REAL_DMA 2219 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2220 struct NCR5380_hostdata *hostdata = shost_priv(instance); 2221 int transferred; 2222 2223 /* 2224 * XXX this might not be right. 2225 * 2226 * Wait for final byte to transfer, ie wait for ACK to go false. 2227 * 2228 * We should use the Last Byte Sent bit, unfortunately this is 2229 * not available on the 5380/5381 (only the various CMOS chips) 2230 * 2231 * FIXME: timeout, and need to handle long timeout/irq case 2232 */ 2233 2234 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2235 2236 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2237 2238 /* 2239 * The only places we should see a phase mismatch and have to send 2240 * data from the same set of pointers will be the data transfer 2241 * phases. So, residual, requested length are only important here. 2242 */ 2243 2244 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2245 transferred = instance->dmalen - NCR5380_dma_residual(); 2246 hostdata->connected->SCp.this_residual -= transferred; 2247 hostdata->connected->SCp.ptr += transferred; 2248 } 2249 } 2250 #endif /* def REAL_DMA */ 2251 2252 /** 2253 * list_find_cmd - test for presence of a command in a linked list 2254 * @haystack: list of commands 2255 * @needle: command to search for 2256 */ 2257 2258 static bool list_find_cmd(struct list_head *haystack, 2259 struct scsi_cmnd *needle) 2260 { 2261 struct NCR5380_cmd *ncmd; 2262 2263 list_for_each_entry(ncmd, haystack, list) 2264 if (NCR5380_to_scmd(ncmd) == needle) 2265 return true; 2266 return false; 2267 } 2268 2269 /** 2270 * list_remove_cmd - remove a command from linked list 2271 * @haystack: list of commands 2272 * @needle: command to remove 2273 */ 2274 2275 static bool list_del_cmd(struct list_head *haystack, 2276 struct scsi_cmnd *needle) 2277 { 2278 if (list_find_cmd(haystack, needle)) { 2279 struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle); 2280 2281 list_del(&ncmd->list); 2282 return true; 2283 } 2284 return false; 2285 } 2286 2287 /** 2288 * NCR5380_abort - scsi host eh_abort_handler() method 2289 * @cmd: the command to be aborted 2290 * 2291 * Try to abort a given command by removing it from queues and/or sending 2292 * the target an abort message. This may not succeed in causing a target 2293 * to abort the command. Nonetheless, the low-level driver must forget about 2294 * the command because the mid-layer reclaims it and it may be re-issued. 2295 * 2296 * The normal path taken by a command is as follows. For EH we trace this 2297 * same path to locate and abort the command. 2298 * 2299 * unissued -> selecting -> [unissued -> selecting ->]... connected -> 2300 * [disconnected -> connected ->]... 2301 * [autosense -> connected ->] done 2302 * 2303 * If cmd was not found at all then presumably it has already been completed, 2304 * in which case return SUCCESS to try to avoid further EH measures. 2305 * 2306 * If the command has not completed yet, we must not fail to find it. 2307 * We have no option but to forget the aborted command (even if it still 2308 * lacks sense data). The mid-layer may re-issue a command that is in error 2309 * recovery (see scsi_send_eh_cmnd), but the logic and data structures in 2310 * this driver are such that a command can appear on one queue only. 2311 * 2312 * The lock protects driver data structures, but EH handlers also use it 2313 * to serialize their own execution and prevent their own re-entry. 2314 */ 2315 2316 static int NCR5380_abort(struct scsi_cmnd *cmd) 2317 { 2318 struct Scsi_Host *instance = cmd->device->host; 2319 struct NCR5380_hostdata *hostdata = shost_priv(instance); 2320 unsigned long flags; 2321 int result = SUCCESS; 2322 2323 spin_lock_irqsave(&hostdata->lock, flags); 2324 2325 #if (NDEBUG & NDEBUG_ANY) 2326 scmd_printk(KERN_INFO, cmd, __func__); 2327 #endif 2328 NCR5380_dprint(NDEBUG_ANY, instance); 2329 NCR5380_dprint_phase(NDEBUG_ANY, instance); 2330 2331 if (list_del_cmd(&hostdata->unissued, cmd)) { 2332 dsprintk(NDEBUG_ABORT, instance, 2333 "abort: removed %p from issue queue\n", cmd); 2334 cmd->result = DID_ABORT << 16; 2335 cmd->scsi_done(cmd); /* No tag or busy flag to worry about */ 2336 goto out; 2337 } 2338 2339 if (hostdata->selecting == cmd) { 2340 dsprintk(NDEBUG_ABORT, instance, 2341 "abort: cmd %p == selecting\n", cmd); 2342 hostdata->selecting = NULL; 2343 cmd->result = DID_ABORT << 16; 2344 complete_cmd(instance, cmd); 2345 goto out; 2346 } 2347 2348 if (list_del_cmd(&hostdata->disconnected, cmd)) { 2349 dsprintk(NDEBUG_ABORT, instance, 2350 "abort: removed %p from disconnected list\n", cmd); 2351 /* Can't call NCR5380_select() and send ABORT because that 2352 * means releasing the lock. Need a bus reset. 2353 */ 2354 set_host_byte(cmd, DID_ERROR); 2355 complete_cmd(instance, cmd); 2356 result = FAILED; 2357 goto out; 2358 } 2359 2360 if (hostdata->connected == cmd) { 2361 dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd); 2362 hostdata->connected = NULL; 2363 #ifdef REAL_DMA 2364 hostdata->dma_len = 0; 2365 #endif 2366 if (do_abort(instance)) { 2367 set_host_byte(cmd, DID_ERROR); 2368 complete_cmd(instance, cmd); 2369 result = FAILED; 2370 goto out; 2371 } 2372 set_host_byte(cmd, DID_ABORT); 2373 complete_cmd(instance, cmd); 2374 goto out; 2375 } 2376 2377 if (list_del_cmd(&hostdata->autosense, cmd)) { 2378 dsprintk(NDEBUG_ABORT, instance, 2379 "abort: removed %p from sense queue\n", cmd); 2380 set_host_byte(cmd, DID_ERROR); 2381 complete_cmd(instance, cmd); 2382 } 2383 2384 out: 2385 if (result == FAILED) 2386 dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd); 2387 else 2388 dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd); 2389 2390 queue_work(hostdata->work_q, &hostdata->main_task); 2391 spin_unlock_irqrestore(&hostdata->lock, flags); 2392 2393 return result; 2394 } 2395 2396 2397 /** 2398 * NCR5380_bus_reset - reset the SCSI bus 2399 * @cmd: SCSI command undergoing EH 2400 * 2401 * Returns SUCCESS 2402 */ 2403 2404 static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 2405 { 2406 struct Scsi_Host *instance = cmd->device->host; 2407 struct NCR5380_hostdata *hostdata = shost_priv(instance); 2408 int i; 2409 unsigned long flags; 2410 struct NCR5380_cmd *ncmd; 2411 2412 spin_lock_irqsave(&hostdata->lock, flags); 2413 2414 #if (NDEBUG & NDEBUG_ANY) 2415 scmd_printk(KERN_INFO, cmd, __func__); 2416 #endif 2417 NCR5380_dprint(NDEBUG_ANY, instance); 2418 NCR5380_dprint_phase(NDEBUG_ANY, instance); 2419 2420 do_reset(instance); 2421 2422 /* reset NCR registers */ 2423 NCR5380_write(MODE_REG, MR_BASE); 2424 NCR5380_write(TARGET_COMMAND_REG, 0); 2425 NCR5380_write(SELECT_ENABLE_REG, 0); 2426 2427 /* After the reset, there are no more connected or disconnected commands 2428 * and no busy units; so clear the low-level status here to avoid 2429 * conflicts when the mid-level code tries to wake up the affected 2430 * commands! 2431 */ 2432 2433 if (list_del_cmd(&hostdata->unissued, cmd)) { 2434 cmd->result = DID_RESET << 16; 2435 cmd->scsi_done(cmd); 2436 } 2437 2438 if (hostdata->selecting) { 2439 hostdata->selecting->result = DID_RESET << 16; 2440 complete_cmd(instance, hostdata->selecting); 2441 hostdata->selecting = NULL; 2442 } 2443 2444 list_for_each_entry(ncmd, &hostdata->disconnected, list) { 2445 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); 2446 2447 set_host_byte(cmd, DID_RESET); 2448 cmd->scsi_done(cmd); 2449 } 2450 INIT_LIST_HEAD(&hostdata->disconnected); 2451 2452 list_for_each_entry(ncmd, &hostdata->autosense, list) { 2453 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd); 2454 2455 set_host_byte(cmd, DID_RESET); 2456 cmd->scsi_done(cmd); 2457 } 2458 INIT_LIST_HEAD(&hostdata->autosense); 2459 2460 if (hostdata->connected) { 2461 set_host_byte(hostdata->connected, DID_RESET); 2462 complete_cmd(instance, hostdata->connected); 2463 hostdata->connected = NULL; 2464 } 2465 2466 for (i = 0; i < 8; ++i) 2467 hostdata->busy[i] = 0; 2468 #ifdef REAL_DMA 2469 hostdata->dma_len = 0; 2470 #endif 2471 2472 queue_work(hostdata->work_q, &hostdata->main_task); 2473 spin_unlock_irqrestore(&hostdata->lock, flags); 2474 2475 return SUCCESS; 2476 } 2477