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 * DISTRIBUTION RELEASE 6. 15 * 16 * For more information, please consult 17 * 18 * NCR 5380 Family 19 * SCSI Protocol Controller 20 * Databook 21 * 22 * NCR Microelectronics 23 * 1635 Aeroplaza Drive 24 * Colorado Springs, CO 80916 25 * 1+ (719) 578-3400 26 * 1+ (800) 334-5454 27 */ 28 29 /* 30 * $Log: NCR5380.c,v $ 31 32 * Revision 1.10 1998/9/2 Alan Cox 33 * (alan@redhat.com) 34 * Fixed up the timer lockups reported so far. Things still suck. Looking 35 * forward to 2.3 and per device request queues. Then it'll be possible to 36 * SMP thread this beast and improve life no end. 37 38 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg 39 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) 40 * (hopefully) fixed and enhanced USLEEP 41 * added support for DTC3181E card (for Mustek scanner) 42 * 43 44 * Revision 1.8 Ingmar Baumgart 45 * (ingmar@gonzo.schwaben.de) 46 * added support for NCR53C400a card 47 * 48 49 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) 50 * added proc_info 51 * added support needed for DTC 3180/3280 52 * fixed a couple of bugs 53 * 54 55 * Revision 1.5 1994/01/19 09:14:57 drew 56 * Fixed udelay() hack that was being used on DATAOUT phases 57 * instead of a proper wait for the final handshake. 58 * 59 * Revision 1.4 1994/01/19 06:44:25 drew 60 * *** empty log message *** 61 * 62 * Revision 1.3 1994/01/19 05:24:40 drew 63 * Added support for TCR LAST_BYTE_SENT bit. 64 * 65 * Revision 1.2 1994/01/15 06:14:11 drew 66 * REAL DMA support, bug fixes. 67 * 68 * Revision 1.1 1994/01/15 06:00:54 drew 69 * Initial revision 70 * 71 */ 72 73 /* 74 * Further development / testing that should be done : 75 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete 76 * code so that everything does the same thing that's done at the 77 * end of a pseudo-DMA read operation. 78 * 79 * 2. Fix REAL_DMA (interrupt driven, polled works fine) - 80 * basically, transfer size needs to be reduced by one 81 * and the last byte read as is done with PSEUDO_DMA. 82 * 83 * 4. Test SCSI-II tagged queueing (I have no devices which support 84 * tagged queueing) 85 * 86 * 5. Test linked command handling code after Eric is ready with 87 * the high level code. 88 */ 89 #include <scsi/scsi_dbg.h> 90 91 #ifndef NDEBUG 92 #define NDEBUG 0 93 #endif 94 #ifndef NDEBUG 95 #define NDEBUG_ABORT 0 96 #endif 97 98 #if (NDEBUG & NDEBUG_LISTS) 99 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } 100 #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } 101 #else 102 #define LIST(x,y) 103 #define REMOVE(w,x,y,z) 104 #endif 105 106 #ifndef notyet 107 #undef LINKED 108 #undef REAL_DMA 109 #endif 110 111 #ifdef REAL_DMA_POLL 112 #undef READ_OVERRUNS 113 #define READ_OVERRUNS 114 #endif 115 116 #ifdef BOARD_REQUIRES_NO_DELAY 117 #define io_recovery_delay(x) 118 #else 119 #define io_recovery_delay(x) udelay(x) 120 #endif 121 122 /* 123 * Design 124 * 125 * This is a generic 5380 driver. To use it on a different platform, 126 * one simply writes appropriate system specific macros (ie, data 127 * transfer - some PC's will use the I/O bus, 68K's must use 128 * memory mapped) and drops this file in their 'C' wrapper. 129 * 130 * (Note from hch: unfortunately it was not enough for the different 131 * m68k folks and instead of improving this driver they copied it 132 * and hacked it up for their needs. As a consequence they lost 133 * most updates to this driver. Maybe someone will fix all these 134 * drivers to use a common core one day..) 135 * 136 * As far as command queueing, two queues are maintained for 137 * each 5380 in the system - commands that haven't been issued yet, 138 * and commands that are currently executing. This means that an 139 * unlimited number of commands may be queued, letting 140 * more commands propagate from the higher driver levels giving higher 141 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 142 * allowing multiple commands to propagate all the way to a SCSI-II device 143 * while a command is already executing. 144 * 145 * 146 * Issues specific to the NCR5380 : 147 * 148 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 149 * piece of hardware that requires you to sit in a loop polling for 150 * the REQ signal as long as you are connected. Some devices are 151 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 152 * while doing long seek operations. 153 * 154 * The workaround for this is to keep track of devices that have 155 * disconnected. If the device hasn't disconnected, for commands that 156 * should disconnect, we do something like 157 * 158 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } 159 * 160 * Some tweaking of N and M needs to be done. An algorithm based 161 * on "time to data" would give the best results as long as short time 162 * to datas (ie, on the same track) were considered, however these 163 * broken devices are the exception rather than the rule and I'd rather 164 * spend my time optimizing for the normal case. 165 * 166 * Architecture : 167 * 168 * At the heart of the design is a coroutine, NCR5380_main, 169 * which is started from a workqueue for each NCR5380 host in the 170 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by 171 * removing the commands from the issue queue and calling 172 * NCR5380_select() if a nexus is not established. 173 * 174 * Once a nexus is established, the NCR5380_information_transfer() 175 * phase goes through the various phases as instructed by the target. 176 * if the target goes into MSG IN and sends a DISCONNECT message, 177 * the command structure is placed into the per instance disconnected 178 * queue, and NCR5380_main tries to find more work. If the target is 179 * idle for too long, the system will try to sleep. 180 * 181 * If a command has disconnected, eventually an interrupt will trigger, 182 * calling NCR5380_intr() which will in turn call NCR5380_reselect 183 * to reestablish a nexus. This will run main if necessary. 184 * 185 * On command termination, the done function will be called as 186 * appropriate. 187 * 188 * SCSI pointers are maintained in the SCp field of SCSI command 189 * structures, being initialized after the command is connected 190 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 191 * Note that in violation of the standard, an implicit SAVE POINTERS operation 192 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 193 */ 194 195 /* 196 * Using this file : 197 * This file a skeleton Linux SCSI driver for the NCR 5380 series 198 * of chips. To use it, you write an architecture specific functions 199 * and macros and include this file in your driver. 200 * 201 * These macros control options : 202 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 203 * defined. 204 * 205 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 206 * for commands that return with a CHECK CONDITION status. 207 * 208 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential 209 * transceivers. 210 * 211 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or 212 * override-configure an IRQ. 213 * 214 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 215 * bytes at a time. Since interrupts are disabled by default during 216 * these transfers, we might need this to give reasonable interrupt 217 * service time if the transfer size gets too large. 218 * 219 * LINKED - if defined, linked commands are supported. 220 * 221 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. 222 * 223 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 224 * 225 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't 226 * rely on phase mismatch and EOP interrupts to determine end 227 * of phase. 228 * 229 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You 230 * only really want to use this if you're having a problem with 231 * dropped characters during high speed communications, and even 232 * then, you're going to be better off twiddling with transfersize 233 * in the high level code. 234 * 235 * Defaults for these will be provided although the user may want to adjust 236 * these to allocate CPU resources to the SCSI driver or "real" code. 237 * 238 * USLEEP_SLEEP - amount of time, in jiffies, to sleep 239 * 240 * USLEEP_POLL - amount of time, in jiffies, to poll 241 * 242 * These macros MUST be defined : 243 * NCR5380_local_declare() - declare any local variables needed for your 244 * transfer routines. 245 * 246 * NCR5380_setup(instance) - initialize any local variables needed from a given 247 * instance of the host adapter for NCR5380_{read,write,pread,pwrite} 248 * 249 * NCR5380_read(register) - read from the specified register 250 * 251 * NCR5380_write(register, value) - write to the specific register 252 * 253 * NCR5380_implementation_fields - additional fields needed for this 254 * specific implementation of the NCR5380 255 * 256 * Either real DMA *or* pseudo DMA may be implemented 257 * REAL functions : 258 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 259 * Note that the DMA setup functions should return the number of bytes 260 * that they were able to program the controller for. 261 * 262 * Also note that generic i386/PC versions of these macros are 263 * available as NCR5380_i386_dma_write_setup, 264 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 265 * 266 * NCR5380_dma_write_setup(instance, src, count) - initialize 267 * NCR5380_dma_read_setup(instance, dst, count) - initialize 268 * NCR5380_dma_residual(instance); - residual count 269 * 270 * PSEUDO functions : 271 * NCR5380_pwrite(instance, src, count) 272 * NCR5380_pread(instance, dst, count); 273 * 274 * The generic driver is initialized by calling NCR5380_init(instance), 275 * after setting the appropriate host specific fields and ID. If the 276 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 277 * possible) function may be used. 278 */ 279 280 static int do_abort(struct Scsi_Host *host); 281 static void do_reset(struct Scsi_Host *host); 282 283 /* 284 * initialize_SCp - init the scsi pointer field 285 * @cmd: command block to set up 286 * 287 * Set up the internal fields in the SCSI command. 288 */ 289 290 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) 291 { 292 /* 293 * Initialize the Scsi Pointer field so that all of the commands in the 294 * various queues are valid. 295 */ 296 297 if (cmd->use_sg) { 298 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer; 299 cmd->SCp.buffers_residual = cmd->use_sg - 1; 300 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 301 cmd->SCp.buffer->offset; 302 cmd->SCp.this_residual = cmd->SCp.buffer->length; 303 } else { 304 cmd->SCp.buffer = NULL; 305 cmd->SCp.buffers_residual = 0; 306 cmd->SCp.ptr = (char *) cmd->request_buffer; 307 cmd->SCp.this_residual = cmd->request_bufflen; 308 } 309 } 310 311 /** 312 * NCR5380_poll_politely - wait for NCR5380 status bits 313 * @instance: controller to poll 314 * @reg: 5380 register to poll 315 * @bit: Bitmask to check 316 * @val: Value required to exit 317 * 318 * Polls the NCR5380 in a reasonably efficient manner waiting for 319 * an event to occur, after a short quick poll we begin giving the 320 * CPU back in non IRQ contexts 321 * 322 * Returns the value of the register or a negative error code. 323 */ 324 325 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) 326 { 327 NCR5380_local_declare(); 328 int n = 500; /* At about 8uS a cycle for the cpu access */ 329 unsigned long end = jiffies + t; 330 int r; 331 332 NCR5380_setup(instance); 333 334 while( n-- > 0) 335 { 336 r = NCR5380_read(reg); 337 if((r & bit) == val) 338 return 0; 339 cpu_relax(); 340 } 341 342 /* t time yet ? */ 343 while(time_before(jiffies, end)) 344 { 345 r = NCR5380_read(reg); 346 if((r & bit) == val) 347 return 0; 348 if(!in_interrupt()) 349 yield(); 350 else 351 cpu_relax(); 352 } 353 return -ETIMEDOUT; 354 } 355 356 static struct { 357 unsigned char value; 358 const char *name; 359 } phases[] = { 360 {PHASE_DATAOUT, "DATAOUT"}, 361 {PHASE_DATAIN, "DATAIN"}, 362 {PHASE_CMDOUT, "CMDOUT"}, 363 {PHASE_STATIN, "STATIN"}, 364 {PHASE_MSGOUT, "MSGOUT"}, 365 {PHASE_MSGIN, "MSGIN"}, 366 {PHASE_UNKNOWN, "UNKNOWN"} 367 }; 368 369 #if NDEBUG 370 static struct { 371 unsigned char mask; 372 const char *name; 373 } signals[] = { 374 {SR_DBP, "PARITY"}, 375 {SR_RST, "RST"}, 376 {SR_BSY, "BSY"}, 377 {SR_REQ, "REQ"}, 378 {SR_MSG, "MSG"}, 379 {SR_CD, "CD"}, 380 {SR_IO, "IO"}, 381 {SR_SEL, "SEL"}, 382 {0, NULL} 383 }, 384 basrs[] = { 385 {BASR_ATN, "ATN"}, 386 {BASR_ACK, "ACK"}, 387 {0, NULL} 388 }, 389 icrs[] = { 390 {ICR_ASSERT_RST, "ASSERT RST"}, 391 {ICR_ASSERT_ACK, "ASSERT ACK"}, 392 {ICR_ASSERT_BSY, "ASSERT BSY"}, 393 {ICR_ASSERT_SEL, "ASSERT SEL"}, 394 {ICR_ASSERT_ATN, "ASSERT ATN"}, 395 {ICR_ASSERT_DATA, "ASSERT DATA"}, 396 {0, NULL} 397 }, 398 mrs[] = { 399 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 400 {MR_TARGET, "MODE TARGET"}, 401 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 402 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 403 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 404 {MR_DMA_MODE, "MODE DMA"}, 405 {MR_ARBITRATE, "MODE ARBITRATION"}, 406 {0, NULL} 407 }; 408 409 /** 410 * NCR5380_print - print scsi bus signals 411 * @instance: adapter state to dump 412 * 413 * Print the SCSI bus signals for debugging purposes 414 * 415 * Locks: caller holds hostdata lock (not essential) 416 */ 417 418 static void NCR5380_print(struct Scsi_Host *instance) 419 { 420 NCR5380_local_declare(); 421 unsigned char status, data, basr, mr, icr, i; 422 NCR5380_setup(instance); 423 424 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 425 status = NCR5380_read(STATUS_REG); 426 mr = NCR5380_read(MODE_REG); 427 icr = NCR5380_read(INITIATOR_COMMAND_REG); 428 basr = NCR5380_read(BUS_AND_STATUS_REG); 429 430 printk("STATUS_REG: %02x ", status); 431 for (i = 0; signals[i].mask; ++i) 432 if (status & signals[i].mask) 433 printk(",%s", signals[i].name); 434 printk("\nBASR: %02x ", basr); 435 for (i = 0; basrs[i].mask; ++i) 436 if (basr & basrs[i].mask) 437 printk(",%s", basrs[i].name); 438 printk("\nICR: %02x ", icr); 439 for (i = 0; icrs[i].mask; ++i) 440 if (icr & icrs[i].mask) 441 printk(",%s", icrs[i].name); 442 printk("\nMODE: %02x ", mr); 443 for (i = 0; mrs[i].mask; ++i) 444 if (mr & mrs[i].mask) 445 printk(",%s", mrs[i].name); 446 printk("\n"); 447 } 448 449 450 /* 451 * NCR5380_print_phase - show SCSI phase 452 * @instance: adapter to dump 453 * 454 * Print the current SCSI phase for debugging purposes 455 * 456 * Locks: none 457 */ 458 459 static void NCR5380_print_phase(struct Scsi_Host *instance) 460 { 461 NCR5380_local_declare(); 462 unsigned char status; 463 int i; 464 NCR5380_setup(instance); 465 466 status = NCR5380_read(STATUS_REG); 467 if (!(status & SR_REQ)) 468 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); 469 else { 470 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); 471 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); 472 } 473 } 474 #endif 475 476 /* 477 * These need tweaking, and would probably work best as per-device 478 * flags initialized differently for disk, tape, cd, etc devices. 479 * People with broken devices are free to experiment as to what gives 480 * the best results for them. 481 * 482 * USLEEP_SLEEP should be a minimum seek time. 483 * 484 * USLEEP_POLL should be a maximum rotational latency. 485 */ 486 #ifndef USLEEP_SLEEP 487 /* 20 ms (reasonable hard disk speed) */ 488 #define USLEEP_SLEEP (20*HZ/1000) 489 #endif 490 /* 300 RPM (floppy speed) */ 491 #ifndef USLEEP_POLL 492 #define USLEEP_POLL (200*HZ/1000) 493 #endif 494 #ifndef USLEEP_WAITLONG 495 /* RvC: (reasonable time to wait on select error) */ 496 #define USLEEP_WAITLONG USLEEP_SLEEP 497 #endif 498 499 /* 500 * Function : int should_disconnect (unsigned char cmd) 501 * 502 * Purpose : decide weather a command would normally disconnect or 503 * not, since if it won't disconnect we should go to sleep. 504 * 505 * Input : cmd - opcode of SCSI command 506 * 507 * Returns : DISCONNECT_LONG if we should disconnect for a really long 508 * time (ie always, sleep, look for REQ active, sleep), 509 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal 510 * time-to-data delay, DISCONNECT_NONE if this command would return 511 * immediately. 512 * 513 * Future sleep algorithms based on time to data can exploit 514 * something like this so they can differentiate between "normal" 515 * (ie, read, write, seek) and unusual commands (ie, * format). 516 * 517 * Note : We don't deal with commands that handle an immediate disconnect, 518 * 519 */ 520 521 static int should_disconnect(unsigned char cmd) 522 { 523 switch (cmd) { 524 case READ_6: 525 case WRITE_6: 526 case SEEK_6: 527 case READ_10: 528 case WRITE_10: 529 case SEEK_10: 530 return DISCONNECT_TIME_TO_DATA; 531 case FORMAT_UNIT: 532 case SEARCH_HIGH: 533 case SEARCH_LOW: 534 case SEARCH_EQUAL: 535 return DISCONNECT_LONG; 536 default: 537 return DISCONNECT_NONE; 538 } 539 } 540 541 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) 542 { 543 hostdata->time_expires = jiffies + timeout; 544 schedule_delayed_work(&hostdata->coroutine, timeout); 545 } 546 547 548 static int probe_irq __initdata = 0; 549 550 /** 551 * probe_intr - helper for IRQ autoprobe 552 * @irq: interrupt number 553 * @dev_id: unused 554 * @regs: unused 555 * 556 * Set a flag to indicate the IRQ in question was received. This is 557 * used by the IRQ probe code. 558 */ 559 560 static irqreturn_t __init probe_intr(int irq, void *dev_id, 561 struct pt_regs *regs) 562 { 563 probe_irq = irq; 564 return IRQ_HANDLED; 565 } 566 567 /** 568 * NCR5380_probe_irq - find the IRQ of an NCR5380 569 * @instance: NCR5380 controller 570 * @possible: bitmask of ISA IRQ lines 571 * 572 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ 573 * and then looking to see what interrupt actually turned up. 574 * 575 * Locks: none, irqs must be enabled on entry 576 */ 577 578 static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible) 579 { 580 NCR5380_local_declare(); 581 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 582 unsigned long timeout; 583 int trying_irqs, i, mask; 584 NCR5380_setup(instance); 585 586 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) 587 if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL) == 0)) 588 trying_irqs |= mask; 589 590 timeout = jiffies + (250 * HZ / 1000); 591 probe_irq = SCSI_IRQ_NONE; 592 593 /* 594 * A interrupt is triggered whenever BSY = false, SEL = true 595 * and a bit set in the SELECT_ENABLE_REG is asserted on the 596 * SCSI bus. 597 * 598 * Note that the bus is only driven when the phase control signals 599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 600 * to zero. 601 */ 602 603 NCR5380_write(TARGET_COMMAND_REG, 0); 604 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 605 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 607 608 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) 609 { 610 set_current_state(TASK_UNINTERRUPTIBLE); 611 schedule_timeout(1); 612 } 613 614 NCR5380_write(SELECT_ENABLE_REG, 0); 615 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 616 617 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 618 if (trying_irqs & mask) 619 free_irq(i, NULL); 620 621 return probe_irq; 622 } 623 624 /** 625 * NCR58380_print_options - show options 626 * @instance: unused for now 627 * 628 * Called by probe code indicating the NCR5380 driver options that 629 * were selected. At some point this will switch to runtime options 630 * read from the adapter in question 631 * 632 * Locks: none 633 */ 634 635 static void __init NCR5380_print_options(struct Scsi_Host *instance) 636 { 637 printk(" generic options" 638 #ifdef AUTOPROBE_IRQ 639 " AUTOPROBE_IRQ" 640 #endif 641 #ifdef AUTOSENSE 642 " AUTOSENSE" 643 #endif 644 #ifdef DIFFERENTIAL 645 " DIFFERENTIAL" 646 #endif 647 #ifdef REAL_DMA 648 " REAL DMA" 649 #endif 650 #ifdef REAL_DMA_POLL 651 " REAL DMA POLL" 652 #endif 653 #ifdef PARITY 654 " PARITY" 655 #endif 656 #ifdef PSEUDO_DMA 657 " PSEUDO DMA" 658 #endif 659 #ifdef UNSAFE 660 " UNSAFE " 661 #endif 662 ); 663 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 664 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 665 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 666 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 667 } 668 } 669 670 /** 671 * NCR5380_print_status - dump controller info 672 * @instance: controller to dump 673 * 674 * Print commands in the various queues, called from NCR5380_abort 675 * and NCR5380_debug to aid debugging. 676 * 677 * Locks: called functions disable irqs 678 */ 679 680 static void NCR5380_print_status(struct Scsi_Host *instance) 681 { 682 NCR5380_dprint(NDEBUG_ANY, instance); 683 NCR5380_dprint_phase(NDEBUG_ANY, instance); 684 } 685 686 /******************************************/ 687 /* 688 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 689 * 690 * *buffer: I/O buffer 691 * **start: if inout == FALSE pointer into buffer where user read should start 692 * offset: current offset 693 * length: length of buffer 694 * hostno: Scsi_Host host_no 695 * inout: TRUE - user is writing; FALSE - user is reading 696 * 697 * Return the number of bytes read from or written 698 */ 699 700 #undef SPRINTF 701 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) 702 static 703 char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); 704 static 705 char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); 706 static 707 char *lprint_opcode(int opcode, char *pos, char *buffer, int length); 708 709 static 710 int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) 711 { 712 char *pos = buffer; 713 struct NCR5380_hostdata *hostdata; 714 Scsi_Cmnd *ptr; 715 716 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 717 718 if (inout) { /* Has data been written to the file ? */ 719 #ifdef DTC_PUBLIC_RELEASE 720 dtc_wmaxi = dtc_maxi = 0; 721 #endif 722 #ifdef PAS16_PUBLIC_RELEASE 723 pas_wmaxi = pas_maxi = 0; 724 #endif 725 return (-ENOSYS); /* Currently this is a no-op */ 726 } 727 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 728 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 729 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 730 #ifdef DTC_PUBLIC_RELEASE 731 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 732 #endif 733 #ifdef T128_PUBLIC_RELEASE 734 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 735 #endif 736 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 737 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 738 #endif 739 #ifdef PAS16_PUBLIC_RELEASE 740 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 741 #endif 742 743 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 744 SPRINTF("io_port: %04x ", (int) instance->io_port); 745 if (instance->irq == SCSI_IRQ_NONE) 746 SPRINTF("IRQ: None.\n"); 747 else 748 SPRINTF("IRQ: %d.\n", instance->irq); 749 750 #ifdef DTC_PUBLIC_RELEASE 751 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 752 #endif 753 #ifdef PAS16_PUBLIC_RELEASE 754 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 755 #endif 756 spin_lock_irq(instance->host_lock); 757 if (!hostdata->connected) 758 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 759 else 760 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); 761 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 762 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 763 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 764 765 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 766 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 767 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 768 spin_unlock_irq(instance->host_lock); 769 770 *start = buffer; 771 if (pos - buffer < offset) 772 return 0; 773 else if (pos - buffer - offset < length) 774 return pos - buffer - offset; 775 return length; 776 } 777 778 static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) 779 { 780 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 781 SPRINTF(" command = "); 782 pos = lprint_command(cmd->cmnd, pos, buffer, length); 783 return (pos); 784 } 785 786 static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) 787 { 788 int i, s; 789 pos = lprint_opcode(command[0], pos, buffer, length); 790 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 791 SPRINTF("%02x ", command[i]); 792 SPRINTF("\n"); 793 return (pos); 794 } 795 796 static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) 797 { 798 SPRINTF("%2d (0x%02x)", opcode, opcode); 799 return (pos); 800 } 801 802 803 /** 804 * NCR5380_init - initialise an NCR5380 805 * @instance: adapter to configure 806 * @flags: control flags 807 * 808 * Initializes *instance and corresponding 5380 chip, 809 * with flags OR'd into the initial flags value. 810 * 811 * Notes : I assume that the host, hostno, and id bits have been 812 * set correctly. I don't care about the irq and other fields. 813 * 814 * Returns 0 for success 815 * 816 * Locks: interrupts must be enabled when we are called 817 */ 818 819 static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) 820 { 821 NCR5380_local_declare(); 822 int i, pass; 823 unsigned long timeout; 824 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 825 826 if(in_interrupt()) 827 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 828 /* 829 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 830 * the base address. 831 */ 832 833 #ifdef NCR53C400 834 if (flags & FLAG_NCR53C400) 835 instance->NCR5380_instance_name += NCR53C400_address_adjust; 836 #endif 837 838 NCR5380_setup(instance); 839 840 hostdata->aborted = 0; 841 hostdata->id_mask = 1 << instance->this_id; 842 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 843 if (i > hostdata->id_mask) 844 hostdata->id_higher_mask |= i; 845 for (i = 0; i < 8; ++i) 846 hostdata->busy[i] = 0; 847 #ifdef REAL_DMA 848 hostdata->dmalen = 0; 849 #endif 850 hostdata->targets_present = 0; 851 hostdata->connected = NULL; 852 hostdata->issue_queue = NULL; 853 hostdata->disconnected_queue = NULL; 854 855 INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata); 856 857 #ifdef NCR5380_STATS 858 for (i = 0; i < 8; ++i) { 859 hostdata->time_read[i] = 0; 860 hostdata->time_write[i] = 0; 861 hostdata->bytes_read[i] = 0; 862 hostdata->bytes_write[i] = 0; 863 } 864 hostdata->timebase = 0; 865 hostdata->pendingw = 0; 866 hostdata->pendingr = 0; 867 #endif 868 869 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 870 if (flags & FLAG_NCR53C400) 871 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 872 else 873 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 874 875 hostdata->host = instance; 876 hostdata->time_expires = 0; 877 878 #ifndef AUTOSENSE 879 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 880 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 881 " be incorrectly cleared.\n", instance->host_no); 882 #endif /* def AUTOSENSE */ 883 884 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 885 NCR5380_write(MODE_REG, MR_BASE); 886 NCR5380_write(TARGET_COMMAND_REG, 0); 887 NCR5380_write(SELECT_ENABLE_REG, 0); 888 889 #ifdef NCR53C400 890 if (hostdata->flags & FLAG_NCR53C400) { 891 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 892 } 893 #endif 894 895 /* 896 * Detect and correct bus wedge problems. 897 * 898 * If the system crashed, it may have crashed in a state 899 * where a SCSI command was still executing, and the 900 * SCSI bus is not in a BUS FREE STATE. 901 * 902 * If this is the case, we'll try to abort the currently 903 * established nexus which we know nothing about, and that 904 * failing, do a hard reset of the SCSI bus 905 */ 906 907 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 908 switch (pass) { 909 case 1: 910 case 3: 911 case 5: 912 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 913 timeout = jiffies + 5 * HZ; 914 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 915 break; 916 case 2: 917 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 918 do_abort(instance); 919 break; 920 case 4: 921 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 922 do_reset(instance); 923 break; 924 case 6: 925 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 926 return -ENXIO; 927 } 928 } 929 return 0; 930 } 931 932 /** 933 * NCR5380_exit - remove an NCR5380 934 * @instance: adapter to remove 935 */ 936 937 static void __devexit NCR5380_exit(struct Scsi_Host *instance) 938 { 939 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 940 941 cancel_delayed_work(&hostdata->coroutine); 942 flush_scheduled_work(); 943 } 944 945 /** 946 * NCR5380_queue_command - queue a command 947 * @cmd: SCSI command 948 * @done: completion handler 949 * 950 * cmd is added to the per instance issue_queue, with minor 951 * twiddling done to the host specific fields of cmd. If the 952 * main coroutine is not running, it is restarted. 953 * 954 * Locks: host lock taken by caller 955 */ 956 957 static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 958 { 959 struct Scsi_Host *instance = cmd->device->host; 960 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 961 Scsi_Cmnd *tmp; 962 963 #if (NDEBUG & NDEBUG_NO_WRITE) 964 switch (cmd->cmnd[0]) { 965 case WRITE_6: 966 case WRITE_10: 967 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 968 cmd->result = (DID_ERROR << 16); 969 done(cmd); 970 return 0; 971 } 972 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 973 974 #ifdef NCR5380_STATS 975 switch (cmd->cmnd[0]) { 976 case WRITE: 977 case WRITE_6: 978 case WRITE_10: 979 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 980 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; 981 hostdata->pendingw++; 982 break; 983 case READ: 984 case READ_6: 985 case READ_10: 986 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 987 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; 988 hostdata->pendingr++; 989 break; 990 } 991 #endif 992 993 /* 994 * We use the host_scribble field as a pointer to the next command 995 * in a queue 996 */ 997 998 cmd->host_scribble = NULL; 999 cmd->scsi_done = done; 1000 cmd->result = 0; 1001 1002 /* 1003 * Insert the cmd into the issue queue. Note that REQUEST SENSE 1004 * commands are added to the head of the queue since any command will 1005 * clear the contingent allegiance condition that exists and the 1006 * sense data is only guaranteed to be valid while the condition exists. 1007 */ 1008 1009 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1010 LIST(cmd, hostdata->issue_queue); 1011 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 1012 hostdata->issue_queue = cmd; 1013 } else { 1014 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 1015 LIST(cmd, tmp); 1016 tmp->host_scribble = (unsigned char *) cmd; 1017 } 1018 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); 1019 1020 /* Run the coroutine if it isn't already running. */ 1021 /* Kick off command processing */ 1022 schedule_work(&hostdata->coroutine); 1023 return 0; 1024 } 1025 1026 1027 /** 1028 * NCR5380_main - NCR state machines 1029 * 1030 * NCR5380_main is a coroutine that runs as long as more work can 1031 * be done on the NCR5380 host adapters in a system. Both 1032 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1033 * in case it is not running. 1034 * 1035 * Locks: called as its own thread with no locks held. Takes the 1036 * host lock and called routines may take the isa dma lock. 1037 */ 1038 1039 static void NCR5380_main(void *p) 1040 { 1041 struct NCR5380_hostdata *hostdata = p; 1042 struct Scsi_Host *instance = hostdata->host; 1043 Scsi_Cmnd *tmp, *prev; 1044 int done; 1045 1046 spin_lock_irq(instance->host_lock); 1047 do { 1048 /* Lock held here */ 1049 done = 1; 1050 if (!hostdata->connected && !hostdata->selecting) { 1051 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); 1052 /* 1053 * Search through the issue_queue for a command destined 1054 * for a target that's not busy. 1055 */ 1056 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1057 { 1058 if (prev != tmp) 1059 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); 1060 /* When we find one, remove it from the issue queue. */ 1061 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1062 if (prev) { 1063 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1064 prev->host_scribble = tmp->host_scribble; 1065 } else { 1066 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1067 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1068 } 1069 tmp->host_scribble = NULL; 1070 1071 /* 1072 * Attempt to establish an I_T_L nexus here. 1073 * On success, instance->hostdata->connected is set. 1074 * On failure, we must add the command back to the 1075 * issue queue so we can keep trying. 1076 */ 1077 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); 1078 1079 /* 1080 * A successful selection is defined as one that 1081 * leaves us with the command connected and 1082 * in hostdata->connected, OR has terminated the 1083 * command. 1084 * 1085 * With successful commands, we fall through 1086 * and see if we can do an information transfer, 1087 * with failures we will restart. 1088 */ 1089 hostdata->selecting = NULL; 1090 /* RvC: have to preset this to indicate a new command is being performed */ 1091 1092 if (!NCR5380_select(instance, tmp, 1093 /* 1094 * REQUEST SENSE commands are issued without tagged 1095 * queueing, even on SCSI-II devices because the 1096 * contingent allegiance condition exists for the 1097 * entire unit. 1098 */ 1099 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1100 break; 1101 } else { 1102 LIST(tmp, hostdata->issue_queue); 1103 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1104 hostdata->issue_queue = tmp; 1105 done = 0; 1106 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); 1107 } 1108 /* lock held here still */ 1109 } /* if target/lun is not busy */ 1110 } /* for */ 1111 /* exited locked */ 1112 } /* if (!hostdata->connected) */ 1113 if (hostdata->selecting) { 1114 tmp = (Scsi_Cmnd *) hostdata->selecting; 1115 /* Selection will drop and retake the lock */ 1116 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1117 /* Ok ?? */ 1118 } else { 1119 /* RvC: device failed, so we wait a long time 1120 this is needed for Mustek scanners, that 1121 do not respond to commands immediately 1122 after a scan */ 1123 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1124 LIST(tmp, hostdata->issue_queue); 1125 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1126 hostdata->issue_queue = tmp; 1127 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1128 } 1129 } /* if hostdata->selecting */ 1130 if (hostdata->connected 1131 #ifdef REAL_DMA 1132 && !hostdata->dmalen 1133 #endif 1134 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1135 ) { 1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); 1137 NCR5380_information_transfer(instance); 1138 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); 1139 done = 0; 1140 } else 1141 break; 1142 } while (!done); 1143 1144 spin_unlock_irq(instance->host_lock); 1145 } 1146 1147 #ifndef DONT_USE_INTR 1148 1149 /** 1150 * NCR5380_intr - generic NCR5380 irq handler 1151 * @irq: interrupt number 1152 * @dev_id: device info 1153 * @regs: registers (unused) 1154 * 1155 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1156 * from the disconnected queue, and restarting NCR5380_main() 1157 * as required. 1158 * 1159 * Locks: takes the needed instance locks 1160 */ 1161 1162 static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) 1163 { 1164 NCR5380_local_declare(); 1165 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; 1166 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1167 int done; 1168 unsigned char basr; 1169 unsigned long flags; 1170 1171 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq)); 1172 1173 do { 1174 done = 1; 1175 spin_lock_irqsave(instance->host_lock, flags); 1176 /* Look for pending interrupts */ 1177 NCR5380_setup(instance); 1178 basr = NCR5380_read(BUS_AND_STATUS_REG); 1179 /* XXX dispatch to appropriate routine if found and done=0 */ 1180 if (basr & BASR_IRQ) { 1181 NCR5380_dprint(NDEBUG_INTR, instance); 1182 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1183 done = 0; 1184 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); 1185 NCR5380_reselect(instance); 1186 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1187 } else if (basr & BASR_PARITY_ERROR) { 1188 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); 1189 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1190 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1191 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); 1192 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1193 } else { 1194 #if defined(REAL_DMA) 1195 /* 1196 * We should only get PHASE MISMATCH and EOP interrupts 1197 * if we have DMA enabled, so do a sanity check based on 1198 * the current setting of the MODE register. 1199 */ 1200 1201 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1202 int transfered; 1203 1204 if (!hostdata->connected) 1205 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1206 1207 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1208 hostdata->connected->SCp.this_residual -= transferred; 1209 hostdata->connected->SCp.ptr += transferred; 1210 hostdata->dmalen = 0; 1211 1212 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1213 1214 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1215 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1216 1217 NCR5380_write(MODE_REG, MR_BASE); 1218 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1219 } 1220 #else 1221 dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG))); 1222 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1223 #endif 1224 } 1225 } /* if BASR_IRQ */ 1226 spin_unlock_irqrestore(instance->host_lock, flags); 1227 if(!done) 1228 schedule_work(&hostdata->coroutine); 1229 } while (!done); 1230 return IRQ_HANDLED; 1231 } 1232 1233 #endif 1234 1235 /** 1236 * collect_stats - collect stats on a scsi command 1237 * @hostdata: adapter 1238 * @cmd: command being issued 1239 * 1240 * Update the statistical data by parsing the command in question 1241 */ 1242 1243 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1244 { 1245 #ifdef NCR5380_STATS 1246 switch (cmd->cmnd[0]) { 1247 case WRITE: 1248 case WRITE_6: 1249 case WRITE_10: 1250 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); 1251 hostdata->pendingw--; 1252 break; 1253 case READ: 1254 case READ_6: 1255 case READ_10: 1256 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); 1257 hostdata->pendingr--; 1258 break; 1259 } 1260 #endif 1261 } 1262 1263 1264 /* 1265 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1266 * int tag); 1267 * 1268 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1269 * including ARBITRATION, SELECTION, and initial message out for 1270 * IDENTIFY and queue messages. 1271 * 1272 * Inputs : instance - instantiation of the 5380 driver on which this 1273 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1274 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1275 * the command that is presently connected. 1276 * 1277 * Returns : -1 if selection could not execute for some reason, 1278 * 0 if selection succeeded or failed because the target 1279 * did not respond. 1280 * 1281 * Side effects : 1282 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1283 * with registers as they should have been on entry - ie 1284 * SELECT_ENABLE will be set appropriately, the NCR5380 1285 * will cease to drive any SCSI bus signals. 1286 * 1287 * If successful : I_T_L or I_T_L_Q nexus will be established, 1288 * instance->connected will be set to cmd. 1289 * SELECT interrupt will be disabled. 1290 * 1291 * If failed (no target) : cmd->scsi_done() will be called, and the 1292 * cmd->result host byte set to DID_BAD_TARGET. 1293 * 1294 * Locks: caller holds hostdata lock in IRQ mode 1295 */ 1296 1297 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1298 { 1299 NCR5380_local_declare(); 1300 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1301 unsigned char tmp[3], phase; 1302 unsigned char *data; 1303 int len; 1304 unsigned long timeout; 1305 unsigned char value; 1306 int err; 1307 NCR5380_setup(instance); 1308 1309 if (hostdata->selecting) 1310 goto part2; 1311 1312 hostdata->restart_select = 0; 1313 1314 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1315 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); 1316 1317 /* 1318 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1319 * data bus during SELECTION. 1320 */ 1321 1322 NCR5380_write(TARGET_COMMAND_REG, 0); 1323 1324 /* 1325 * Start arbitration. 1326 */ 1327 1328 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1329 NCR5380_write(MODE_REG, MR_ARBITRATE); 1330 1331 1332 /* We can be relaxed here, interrupts are on, we are 1333 in workqueue context, the birds are singing in the trees */ 1334 spin_unlock_irq(instance->host_lock); 1335 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1336 spin_lock_irq(instance->host_lock); 1337 if (err < 0) { 1338 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1339 NCR5380_write(MODE_REG, MR_BASE); 1340 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1341 goto failed; 1342 } 1343 1344 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); 1345 1346 /* 1347 * The arbitration delay is 2.2us, but this is a minimum and there is 1348 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1349 * the integral nature of udelay(). 1350 * 1351 */ 1352 1353 udelay(3); 1354 1355 /* Check for lost arbitration */ 1356 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1357 NCR5380_write(MODE_REG, MR_BASE); 1358 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); 1359 goto failed; 1360 } 1361 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1362 1363 if (!(hostdata->flags & FLAG_DTC3181E) && 1364 /* RvC: DTC3181E has some trouble with this 1365 * so we simply removed it. Seems to work with 1366 * only Mustek scanner attached 1367 */ 1368 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1369 NCR5380_write(MODE_REG, MR_BASE); 1370 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1371 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); 1372 goto failed; 1373 } 1374 /* 1375 * Again, bus clear + bus settle time is 1.2us, however, this is 1376 * a minimum so we'll udelay ceil(1.2) 1377 */ 1378 1379 udelay(2); 1380 1381 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); 1382 1383 /* 1384 * Now that we have won arbitration, start Selection process, asserting 1385 * the host and target ID's on the SCSI bus. 1386 */ 1387 1388 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); 1389 1390 /* 1391 * Raise ATN while SEL is true before BSY goes false from arbitration, 1392 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1393 * phase immediately after selection. 1394 */ 1395 1396 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1397 NCR5380_write(MODE_REG, MR_BASE); 1398 1399 /* 1400 * Reselect interrupts must be turned off prior to the dropping of BSY, 1401 * otherwise we will trigger an interrupt. 1402 */ 1403 NCR5380_write(SELECT_ENABLE_REG, 0); 1404 1405 /* 1406 * The initiator shall then wait at least two deskew delays and release 1407 * the BSY signal. 1408 */ 1409 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1410 1411 /* Reset BSY */ 1412 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1413 1414 /* 1415 * Something weird happens when we cease to drive BSY - looks 1416 * like the board/chip is letting us do another read before the 1417 * appropriate propagation delay has expired, and we're confusing 1418 * a BSY signal from ourselves as the target's response to SELECTION. 1419 * 1420 * A small delay (the 'C++' frontend breaks the pipeline with an 1421 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1422 * tighter 'C' code breaks and requires this) solves the problem - 1423 * the 1 us delay is arbitrary, and only used because this delay will 1424 * be the same on other platforms and since it works here, it should 1425 * work there. 1426 * 1427 * wingel suggests that this could be due to failing to wait 1428 * one deskew delay. 1429 */ 1430 1431 udelay(1); 1432 1433 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, cmd->device->id)); 1434 1435 /* 1436 * The SCSI specification calls for a 250 ms timeout for the actual 1437 * selection. 1438 */ 1439 1440 timeout = jiffies + (250 * HZ / 1000); 1441 1442 /* 1443 * XXX very interesting - we're seeing a bounce where the BSY we 1444 * asserted is being reflected / still asserted (propagation delay?) 1445 * and it's detecting as true. Sigh. 1446 */ 1447 1448 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1449 hostdata->selecting = cmd; 1450 1451 part2: 1452 /* RvC: here we enter after a sleeping period, or immediately after 1453 execution of part 1 1454 we poll only once ech clock tick */ 1455 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1456 1457 if (!value && (hostdata->select_time < HZ/4)) { 1458 /* RvC: we still must wait for a device response */ 1459 hostdata->select_time++; /* after 25 ticks the device has failed */ 1460 NCR5380_set_timer(hostdata, 1); 1461 return 0; /* RvC: we return here with hostdata->selecting set, 1462 to go to sleep */ 1463 } 1464 1465 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1466 waiting period */ 1467 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1468 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1469 NCR5380_reselect(instance); 1470 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1471 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1472 return -1; 1473 } 1474 /* 1475 * No less than two deskew delays after the initiator detects the 1476 * BSY signal is true, it shall release the SEL signal and may 1477 * change the DATA BUS. -wingel 1478 */ 1479 1480 udelay(1); 1481 1482 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1483 1484 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1485 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1486 if (hostdata->targets_present & (1 << cmd->device->id)) { 1487 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1488 if (hostdata->restart_select) 1489 printk(KERN_DEBUG "\trestart select\n"); 1490 NCR5380_dprint(NDEBUG_SELECTION, instance); 1491 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1492 return -1; 1493 } 1494 cmd->result = DID_BAD_TARGET << 16; 1495 collect_stats(hostdata, cmd); 1496 cmd->scsi_done(cmd); 1497 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1498 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); 1499 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1500 return 0; 1501 } 1502 hostdata->targets_present |= (1 << cmd->device->id); 1503 1504 /* 1505 * Since we followed the SCSI spec, and raised ATN while SEL 1506 * was true but before BSY was false during selection, the information 1507 * transfer phase should be a MESSAGE OUT phase so that we can send the 1508 * IDENTIFY message. 1509 * 1510 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1511 * message (2 bytes) with a tag ID that we increment with every command 1512 * until it wraps back to 0. 1513 * 1514 * XXX - it turns out that there are some broken SCSI-II devices, 1515 * which claim to support tagged queuing but fail when more than 1516 * some number of commands are issued at once. 1517 */ 1518 1519 /* Wait for start of REQ/ACK handshake */ 1520 1521 spin_unlock_irq(instance->host_lock); 1522 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1523 spin_lock_irq(instance->host_lock); 1524 1525 if(err) { 1526 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1527 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1528 goto failed; 1529 } 1530 1531 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); 1532 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1533 1534 len = 1; 1535 cmd->tag = 0; 1536 1537 /* Send message(s) */ 1538 data = tmp; 1539 phase = PHASE_MSGOUT; 1540 NCR5380_transfer_pio(instance, &phase, &len, &data); 1541 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); 1542 /* XXX need to handle errors here */ 1543 hostdata->connected = cmd; 1544 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1545 1546 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { 1547 initialize_SCp(cmd); 1548 } 1549 1550 return 0; 1551 1552 /* Selection failed */ 1553 failed: 1554 return -1; 1555 1556 } 1557 1558 /* 1559 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1560 * unsigned char *phase, int *count, unsigned char **data) 1561 * 1562 * Purpose : transfers data in given phase using polled I/O 1563 * 1564 * Inputs : instance - instance of driver, *phase - pointer to 1565 * what phase is expected, *count - pointer to number of 1566 * bytes to transfer, **data - pointer to data pointer. 1567 * 1568 * Returns : -1 when different phase is entered without transferring 1569 * maximum number of bytes, 0 if all bytes or transfered or exit 1570 * is in same phase. 1571 * 1572 * Also, *phase, *count, *data are modified in place. 1573 * 1574 * XXX Note : handling for bus free may be useful. 1575 */ 1576 1577 /* 1578 * Note : this code is not as quick as it could be, however it 1579 * IS 100% reliable, and for the actual data transfer where speed 1580 * counts, we will always do a pseudo DMA or DMA transfer. 1581 */ 1582 1583 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1584 NCR5380_local_declare(); 1585 unsigned char p = *phase, tmp; 1586 int c = *count; 1587 unsigned char *d = *data; 1588 /* 1589 * RvC: some administrative data to process polling time 1590 */ 1591 int break_allowed = 0; 1592 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1593 NCR5380_setup(instance); 1594 1595 if (!(p & SR_IO)) 1596 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); 1597 else 1598 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); 1599 1600 /* 1601 * The NCR5380 chip will only drive the SCSI bus when the 1602 * phase specified in the appropriate bits of the TARGET COMMAND 1603 * REGISTER match the STATUS REGISTER 1604 */ 1605 1606 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1607 1608 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1609 * so breaks are not necessary there 1610 */ 1611 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1612 break_allowed = 1; 1613 } 1614 do { 1615 /* 1616 * Wait for assertion of REQ, after which the phase bits will be 1617 * valid 1618 */ 1619 1620 /* RvC: we simply poll once, after that we stop temporarily 1621 * and let the device buffer fill up 1622 * if breaking is not allowed, we keep polling as long as needed 1623 */ 1624 1625 /* FIXME */ 1626 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1627 if (!(tmp & SR_REQ)) { 1628 /* timeout condition */ 1629 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1630 break; 1631 } 1632 1633 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); 1634 1635 /* Check for phase mismatch */ 1636 if ((tmp & PHASE_MASK) != p) { 1637 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); 1638 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1639 break; 1640 } 1641 /* Do actual transfer from SCSI bus to / from memory */ 1642 if (!(p & SR_IO)) 1643 NCR5380_write(OUTPUT_DATA_REG, *d); 1644 else 1645 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1646 1647 ++d; 1648 1649 /* 1650 * The SCSI standard suggests that in MSGOUT phase, the initiator 1651 * should drop ATN on the last byte of the message phase 1652 * after REQ has been asserted for the handshake but before 1653 * the initiator raises ACK. 1654 */ 1655 1656 if (!(p & SR_IO)) { 1657 if (!((p & SR_MSG) && c > 1)) { 1658 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1659 NCR5380_dprint(NDEBUG_PIO, instance); 1660 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1661 } else { 1662 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1663 NCR5380_dprint(NDEBUG_PIO, instance); 1664 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1665 } 1666 } else { 1667 NCR5380_dprint(NDEBUG_PIO, instance); 1668 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1669 } 1670 1671 /* FIXME - if this fails bus reset ?? */ 1672 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1673 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); 1674 1675 /* 1676 * We have several special cases to consider during REQ/ACK handshaking : 1677 * 1. We were in MSGOUT phase, and we are on the last byte of the 1678 * message. ATN must be dropped as ACK is dropped. 1679 * 1680 * 2. We are in a MSGIN phase, and we are on the last byte of the 1681 * message. We must exit with ACK asserted, so that the calling 1682 * code may raise ATN before dropping ACK to reject the message. 1683 * 1684 * 3. ACK and ATN are clear and the target may proceed as normal. 1685 */ 1686 if (!(p == PHASE_MSGIN && c == 1)) { 1687 if (p == PHASE_MSGOUT && c > 1) 1688 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1689 else 1690 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1691 } 1692 } while (--c); 1693 1694 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); 1695 1696 *count = c; 1697 *data = d; 1698 tmp = NCR5380_read(STATUS_REG); 1699 if (tmp & SR_REQ) 1700 *phase = tmp & PHASE_MASK; 1701 else 1702 *phase = PHASE_UNKNOWN; 1703 1704 if (!c || (*phase == p)) 1705 return 0; 1706 else 1707 return -1; 1708 } 1709 1710 /** 1711 * do_reset - issue a reset command 1712 * @host: adapter to reset 1713 * 1714 * Issue a reset sequence to the NCR5380 and try and get the bus 1715 * back into sane shape. 1716 * 1717 * Locks: caller holds queue lock 1718 */ 1719 1720 static void do_reset(struct Scsi_Host *host) { 1721 NCR5380_local_declare(); 1722 NCR5380_setup(host); 1723 1724 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1725 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1726 udelay(25); 1727 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1728 } 1729 1730 /* 1731 * Function : do_abort (Scsi_Host *host) 1732 * 1733 * Purpose : abort the currently established nexus. Should only be 1734 * called from a routine which can drop into a 1735 * 1736 * Returns : 0 on success, -1 on failure. 1737 * 1738 * Locks: queue lock held by caller 1739 * FIXME: sort this out and get new_eh running 1740 */ 1741 1742 static int do_abort(struct Scsi_Host *host) { 1743 NCR5380_local_declare(); 1744 unsigned char *msgptr, phase, tmp; 1745 int len; 1746 int rc; 1747 NCR5380_setup(host); 1748 1749 1750 /* Request message out phase */ 1751 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1752 1753 /* 1754 * Wait for the target to indicate a valid phase by asserting 1755 * REQ. Once this happens, we'll have either a MSGOUT phase 1756 * and can immediately send the ABORT message, or we'll have some 1757 * other phase and will have to source/sink data. 1758 * 1759 * We really don't care what value was on the bus or what value 1760 * the target sees, so we just handshake. 1761 */ 1762 1763 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1764 1765 if(rc < 0) 1766 return -1; 1767 1768 tmp = (unsigned char)rc; 1769 1770 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1771 1772 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1773 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1774 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1775 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1776 if(rc == -1) 1777 return -1; 1778 } 1779 tmp = ABORT; 1780 msgptr = &tmp; 1781 len = 1; 1782 phase = PHASE_MSGOUT; 1783 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1784 1785 /* 1786 * If we got here, and the command completed successfully, 1787 * we're about to go into bus free state. 1788 */ 1789 1790 return len ? -1 : 0; 1791 } 1792 1793 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1794 /* 1795 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1796 * unsigned char *phase, int *count, unsigned char **data) 1797 * 1798 * Purpose : transfers data in given phase using either real 1799 * or pseudo DMA. 1800 * 1801 * Inputs : instance - instance of driver, *phase - pointer to 1802 * what phase is expected, *count - pointer to number of 1803 * bytes to transfer, **data - pointer to data pointer. 1804 * 1805 * Returns : -1 when different phase is entered without transferring 1806 * maximum number of bytes, 0 if all bytes or transfered or exit 1807 * is in same phase. 1808 * 1809 * Also, *phase, *count, *data are modified in place. 1810 * 1811 * Locks: io_request lock held by caller 1812 */ 1813 1814 1815 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1816 NCR5380_local_declare(); 1817 register int c = *count; 1818 register unsigned char p = *phase; 1819 register unsigned char *d = *data; 1820 unsigned char tmp; 1821 int foo; 1822 #if defined(REAL_DMA_POLL) 1823 int cnt, toPIO; 1824 unsigned char saved_data = 0, overrun = 0, residue; 1825 #endif 1826 1827 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1828 1829 NCR5380_setup(instance); 1830 1831 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1832 *phase = tmp; 1833 return -1; 1834 } 1835 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1836 #ifdef READ_OVERRUNS 1837 if (p & SR_IO) { 1838 c -= 2; 1839 } 1840 #endif 1841 dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d)); 1842 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1843 #endif 1844 1845 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1846 1847 #ifdef REAL_DMA 1848 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1849 #elif defined(REAL_DMA_POLL) 1850 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1851 #else 1852 /* 1853 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1854 * were not disabled for the duration of a single DMA transfer, from 1855 * before the setting of DMA mode to after transfer of the last byte. 1856 */ 1857 1858 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1859 spin_unlock_irq(instance->host_lock); 1860 #endif 1861 /* KLL May need eop and parity in 53c400 */ 1862 if (hostdata->flags & FLAG_NCR53C400) 1863 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY); 1864 else 1865 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1866 #endif /* def REAL_DMA */ 1867 1868 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1869 1870 /* 1871 * On the PAS16 at least I/O recovery delays are not needed here. 1872 * Everyone else seems to want them. 1873 */ 1874 1875 if (p & SR_IO) { 1876 io_recovery_delay(1); 1877 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1878 } else { 1879 io_recovery_delay(1); 1880 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1881 io_recovery_delay(1); 1882 NCR5380_write(START_DMA_SEND_REG, 0); 1883 io_recovery_delay(1); 1884 } 1885 1886 #if defined(REAL_DMA_POLL) 1887 do { 1888 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1889 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1890 1891 /* 1892 At this point, either we've completed DMA, or we have a phase mismatch, 1893 or we've unexpectedly lost BUSY (which is a real error). 1894 1895 For write DMAs, we want to wait until the last byte has been 1896 transferred out over the bus before we turn off DMA mode. Alas, there 1897 seems to be no terribly good way of doing this on a 5380 under all 1898 conditions. For non-scatter-gather operations, we can wait until REQ 1899 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1900 are nastier, since the device will be expecting more data than we 1901 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1902 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1903 why this signal was added to the newer chips) but on the older 538[01] 1904 this signal does not exist. The workaround for this lack is a watchdog; 1905 we bail out of the wait-loop after a modest amount of wait-time if 1906 the usual exit conditions are not met. Not a terribly clean or 1907 correct solution :-% 1908 1909 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1910 If the chip is in DMA mode for an READ, it will respond to a target's 1911 REQ by latching the SCSI data into the INPUT DATA register and asserting 1912 ACK, even if it has _already_ been notified by the DMA controller that 1913 the current DMA transfer has completed! If the NCR5380 is then taken 1914 out of DMA mode, this already-acknowledged byte is lost. 1915 1916 This is not a problem for "one DMA transfer per command" reads, because 1917 the situation will never arise... either all of the data is DMA'ed 1918 properly, or the target switches to MESSAGE IN phase to signal a 1919 disconnection (either operation bringing the DMA to a clean halt). 1920 However, in order to handle scatter-reads, we must work around the 1921 problem. The chosen fix is to DMA N-2 bytes, then check for the 1922 condition before taking the NCR5380 out of DMA mode. One or two extra 1923 bytes are transferred via PIO as necessary to fill out the original 1924 request. 1925 */ 1926 1927 if (p & SR_IO) { 1928 #ifdef READ_OVERRUNS 1929 udelay(10); 1930 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1931 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1932 overrun = 1; 1933 } 1934 #endif 1935 } else { 1936 int limit = 100; 1937 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1938 if (!(tmp & BASR_PHASE_MATCH)) 1939 break; 1940 if (--limit < 0) 1941 break; 1942 } 1943 } 1944 1945 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1946 1947 NCR5380_write(MODE_REG, MR_BASE); 1948 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1949 1950 residue = NCR5380_dma_residual(instance); 1951 c -= residue; 1952 *count -= c; 1953 *data += c; 1954 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1955 1956 #ifdef READ_OVERRUNS 1957 if (*phase == p && (p & SR_IO) && residue == 0) { 1958 if (overrun) { 1959 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1960 **data = saved_data; 1961 *data += 1; 1962 *count -= 1; 1963 cnt = toPIO = 1; 1964 } else { 1965 printk("No overrun??\n"); 1966 cnt = toPIO = 2; 1967 } 1968 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1969 NCR5380_transfer_pio(instance, phase, &cnt, data); 1970 *count -= toPIO - cnt; 1971 } 1972 #endif 1973 1974 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))); 1975 return 0; 1976 1977 #elif defined(REAL_DMA) 1978 return 0; 1979 #else /* defined(REAL_DMA_POLL) */ 1980 if (p & SR_IO) { 1981 #ifdef DMA_WORKS_RIGHT 1982 foo = NCR5380_pread(instance, d, c); 1983 #else 1984 int diff = 1; 1985 if (hostdata->flags & FLAG_NCR53C400) { 1986 diff = 0; 1987 } 1988 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1989 /* 1990 * We can't disable DMA mode after successfully transferring 1991 * what we plan to be the last byte, since that would open up 1992 * a race condition where if the target asserted REQ before 1993 * we got the DMA mode reset, the NCR5380 would have latched 1994 * an additional byte into the INPUT DATA register and we'd 1995 * have dropped it. 1996 * 1997 * The workaround was to transfer one fewer bytes than we 1998 * intended to with the pseudo-DMA read function, wait for 1999 * the chip to latch the last byte, read it, and then disable 2000 * pseudo-DMA mode. 2001 * 2002 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 2003 * REQ is deasserted when ACK is asserted, and not reasserted 2004 * until ACK goes false. Since the NCR5380 won't lower ACK 2005 * until DACK is asserted, which won't happen unless we twiddle 2006 * the DMA port or we take the NCR5380 out of DMA mode, we 2007 * can guarantee that we won't handshake another extra 2008 * byte. 2009 */ 2010 2011 if (!(hostdata->flags & FLAG_NCR53C400)) { 2012 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2013 /* Wait for clean handshake */ 2014 while (NCR5380_read(STATUS_REG) & SR_REQ); 2015 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2016 } 2017 } 2018 #endif 2019 } else { 2020 #ifdef DMA_WORKS_RIGHT 2021 foo = NCR5380_pwrite(instance, d, c); 2022 #else 2023 int timeout; 2024 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2025 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2026 /* 2027 * Wait for the last byte to be sent. If REQ is being asserted for 2028 * the byte we're interested, we'll ACK it and it will go false. 2029 */ 2030 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2031 timeout = 20000; 2032 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2033 2034 if (!timeout) 2035 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2036 2037 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2038 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2039 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2040 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2041 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2042 } 2043 } 2044 } else { 2045 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2046 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2047 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2048 } 2049 } 2050 #endif 2051 } 2052 NCR5380_write(MODE_REG, MR_BASE); 2053 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2054 2055 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2056 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2057 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2058 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2059 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2060 } else { 2061 printk("53C400w: IRQ NOT THERE!\n"); 2062 } 2063 } 2064 *data = d + c; 2065 *count = 0; 2066 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2067 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2068 spin_lock_irq(instance->host_lock); 2069 #endif /* defined(REAL_DMA_POLL) */ 2070 return foo; 2071 #endif /* def REAL_DMA */ 2072 } 2073 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2074 2075 /* 2076 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2077 * 2078 * Purpose : run through the various SCSI phases and do as the target 2079 * directs us to. Operates on the currently connected command, 2080 * instance->connected. 2081 * 2082 * Inputs : instance, instance for which we are doing commands 2083 * 2084 * Side effects : SCSI things happen, the disconnected queue will be 2085 * modified if a command disconnects, *instance->connected will 2086 * change. 2087 * 2088 * XXX Note : we need to watch for bus free or a reset condition here 2089 * to recover from an unexpected bus free condition. 2090 * 2091 * Locks: io_request_lock held by caller in IRQ mode 2092 */ 2093 2094 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2095 NCR5380_local_declare(); 2096 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2097 unsigned char msgout = NOP; 2098 int sink = 0; 2099 int len; 2100 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2101 int transfersize; 2102 #endif 2103 unsigned char *data; 2104 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2105 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2106 /* RvC: we need to set the end of the polling time */ 2107 unsigned long poll_time = jiffies + USLEEP_POLL; 2108 2109 NCR5380_setup(instance); 2110 2111 while (1) { 2112 tmp = NCR5380_read(STATUS_REG); 2113 /* We only have a valid SCSI phase when REQ is asserted */ 2114 if (tmp & SR_REQ) { 2115 phase = (tmp & PHASE_MASK); 2116 if (phase != old_phase) { 2117 old_phase = phase; 2118 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2119 } 2120 if (sink && (phase != PHASE_MSGOUT)) { 2121 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2122 2123 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2124 while (NCR5380_read(STATUS_REG) & SR_REQ); 2125 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2126 sink = 0; 2127 continue; 2128 } 2129 switch (phase) { 2130 case PHASE_DATAIN: 2131 case PHASE_DATAOUT: 2132 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2133 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2134 sink = 1; 2135 do_abort(instance); 2136 cmd->result = DID_ERROR << 16; 2137 cmd->done(cmd); 2138 return; 2139 #endif 2140 /* 2141 * If there is no room left in the current buffer in the 2142 * scatter-gather list, move onto the next one. 2143 */ 2144 2145 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2146 ++cmd->SCp.buffer; 2147 --cmd->SCp.buffers_residual; 2148 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2149 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 2150 cmd->SCp.buffer->offset; 2151 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2152 } 2153 /* 2154 * The preferred transfer method is going to be 2155 * PSEUDO-DMA for systems that are strictly PIO, 2156 * since we can let the hardware do the handshaking. 2157 * 2158 * For this to work, we need to know the transfersize 2159 * ahead of time, since the pseudo-DMA code will sit 2160 * in an unconditional loop. 2161 */ 2162 2163 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2164 /* KLL 2165 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2166 * driver then it will always be defined, so the 2167 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2168 * NCR5380 case. I think this is a fairly clean solution. 2169 * We supplement these 2 if's with the flag. 2170 */ 2171 #ifdef NCR5380_dma_xfer_len 2172 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2173 #else 2174 transfersize = cmd->transfersize; 2175 2176 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2177 if (transfersize > 512) 2178 transfersize = 512; 2179 #endif /* LIMIT_TRANSFERSIZE */ 2180 2181 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2182 /* Limit transfers to 32K, for xx400 & xx406 2183 * pseudoDMA that transfers in 128 bytes blocks. */ 2184 if (transfersize > 32 * 1024) 2185 transfersize = 32 * 1024; 2186 #endif 2187 len = transfersize; 2188 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2189 /* 2190 * If the watchdog timer fires, all future accesses to this 2191 * device will use the polled-IO. 2192 */ 2193 printk("scsi%d : switching target %d lun %d to slow handshake\n", instance->host_no, cmd->device->id, cmd->device->lun); 2194 cmd->device->borken = 1; 2195 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2196 sink = 1; 2197 do_abort(instance); 2198 cmd->result = DID_ERROR << 16; 2199 cmd->done(cmd); 2200 /* XXX - need to source or sink data here, as appropriate */ 2201 } else 2202 cmd->SCp.this_residual -= transfersize - len; 2203 } else 2204 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2205 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2206 &cmd->SCp.ptr); 2207 break; 2208 case PHASE_MSGIN: 2209 len = 1; 2210 data = &tmp; 2211 NCR5380_transfer_pio(instance, &phase, &len, &data); 2212 cmd->SCp.Message = tmp; 2213 2214 switch (tmp) { 2215 /* 2216 * Linking lets us reduce the time required to get the 2217 * next command out to the device, hopefully this will 2218 * mean we don't waste another revolution due to the delays 2219 * required by ARBITRATION and another SELECTION. 2220 * 2221 * In the current implementation proposal, low level drivers 2222 * merely have to start the next command, pointed to by 2223 * next_link, done() is called as with unlinked commands. 2224 */ 2225 #ifdef LINKED 2226 case LINKED_CMD_COMPLETE: 2227 case LINKED_FLG_CMD_COMPLETE: 2228 /* Accept message by clearing ACK */ 2229 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2230 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2231 /* 2232 * Sanity check : A linked command should only terminate with 2233 * one of these messages if there are more linked commands 2234 * available. 2235 */ 2236 if (!cmd->next_link) { 2237 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2238 sink = 1; 2239 do_abort(instance); 2240 return; 2241 } 2242 initialize_SCp(cmd->next_link); 2243 /* The next command is still part of this process */ 2244 cmd->next_link->tag = cmd->tag; 2245 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2246 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2247 collect_stats(hostdata, cmd); 2248 cmd->scsi_done(cmd); 2249 cmd = hostdata->connected; 2250 break; 2251 #endif /* def LINKED */ 2252 case ABORT: 2253 case COMMAND_COMPLETE: 2254 /* Accept message by clearing ACK */ 2255 sink = 1; 2256 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2257 hostdata->connected = NULL; 2258 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2259 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2260 2261 /* 2262 * I'm not sure what the correct thing to do here is : 2263 * 2264 * If the command that just executed is NOT a request 2265 * sense, the obvious thing to do is to set the result 2266 * code to the values of the stored parameters. 2267 * 2268 * If it was a REQUEST SENSE command, we need some way 2269 * to differentiate between the failure code of the original 2270 * and the failure code of the REQUEST sense - the obvious 2271 * case is success, where we fall through and leave the result 2272 * code unchanged. 2273 * 2274 * The non-obvious place is where the REQUEST SENSE failed 2275 */ 2276 2277 if (cmd->cmnd[0] != REQUEST_SENSE) 2278 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2279 else if (status_byte(cmd->SCp.Status) != GOOD) 2280 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2281 2282 #ifdef AUTOSENSE 2283 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2284 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2285 cmd->cmnd[0] = REQUEST_SENSE; 2286 cmd->cmnd[1] &= 0xe0; 2287 cmd->cmnd[2] = 0; 2288 cmd->cmnd[3] = 0; 2289 cmd->cmnd[4] = sizeof(cmd->sense_buffer); 2290 cmd->cmnd[5] = 0; 2291 2292 cmd->SCp.buffer = NULL; 2293 cmd->SCp.buffers_residual = 0; 2294 cmd->SCp.ptr = (char *) cmd->sense_buffer; 2295 cmd->SCp.this_residual = sizeof(cmd->sense_buffer); 2296 2297 LIST(cmd, hostdata->issue_queue); 2298 cmd->host_scribble = (unsigned char *) 2299 hostdata->issue_queue; 2300 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2301 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2302 } else 2303 #endif /* def AUTOSENSE */ 2304 { 2305 collect_stats(hostdata, cmd); 2306 cmd->scsi_done(cmd); 2307 } 2308 2309 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2310 /* 2311 * Restore phase bits to 0 so an interrupted selection, 2312 * arbitration can resume. 2313 */ 2314 NCR5380_write(TARGET_COMMAND_REG, 0); 2315 2316 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2317 barrier(); 2318 return; 2319 case MESSAGE_REJECT: 2320 /* Accept message by clearing ACK */ 2321 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2322 switch (hostdata->last_message) { 2323 case HEAD_OF_QUEUE_TAG: 2324 case ORDERED_QUEUE_TAG: 2325 case SIMPLE_QUEUE_TAG: 2326 cmd->device->simple_tags = 0; 2327 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2328 break; 2329 default: 2330 break; 2331 } 2332 case DISCONNECT:{ 2333 /* Accept message by clearing ACK */ 2334 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2335 cmd->device->disconnect = 1; 2336 LIST(cmd, hostdata->disconnected_queue); 2337 cmd->host_scribble = (unsigned char *) 2338 hostdata->disconnected_queue; 2339 hostdata->connected = NULL; 2340 hostdata->disconnected_queue = cmd; 2341 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2342 /* 2343 * Restore phase bits to 0 so an interrupted selection, 2344 * arbitration can resume. 2345 */ 2346 NCR5380_write(TARGET_COMMAND_REG, 0); 2347 2348 /* Enable reselect interrupts */ 2349 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2350 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2351 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2352 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2353 barrier(); 2354 return; 2355 } 2356 /* 2357 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2358 * operation, in violation of the SCSI spec so we can safely 2359 * ignore SAVE/RESTORE pointers calls. 2360 * 2361 * Unfortunately, some disks violate the SCSI spec and 2362 * don't issue the required SAVE_POINTERS message before 2363 * disconnecting, and we have to break spec to remain 2364 * compatible. 2365 */ 2366 case SAVE_POINTERS: 2367 case RESTORE_POINTERS: 2368 /* Accept message by clearing ACK */ 2369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2370 break; 2371 case EXTENDED_MESSAGE: 2372 /* 2373 * Extended messages are sent in the following format : 2374 * Byte 2375 * 0 EXTENDED_MESSAGE == 1 2376 * 1 length (includes one byte for code, doesn't 2377 * include first two bytes) 2378 * 2 code 2379 * 3..length+1 arguments 2380 * 2381 * Start the extended message buffer with the EXTENDED_MESSAGE 2382 * byte, since scsi_print_msg() wants the whole thing. 2383 */ 2384 extended_msg[0] = EXTENDED_MESSAGE; 2385 /* Accept first byte by clearing ACK */ 2386 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2387 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2388 2389 len = 2; 2390 data = extended_msg + 1; 2391 phase = PHASE_MSGIN; 2392 NCR5380_transfer_pio(instance, &phase, &len, &data); 2393 2394 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2395 2396 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2397 /* Accept third byte by clearing ACK */ 2398 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2399 len = extended_msg[1] - 1; 2400 data = extended_msg + 3; 2401 phase = PHASE_MSGIN; 2402 2403 NCR5380_transfer_pio(instance, &phase, &len, &data); 2404 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2405 2406 switch (extended_msg[2]) { 2407 case EXTENDED_SDTR: 2408 case EXTENDED_WDTR: 2409 case EXTENDED_MODIFY_DATA_POINTER: 2410 case EXTENDED_EXTENDED_IDENTIFY: 2411 tmp = 0; 2412 } 2413 } else if (len) { 2414 printk("scsi%d: error receiving extended message\n", instance->host_no); 2415 tmp = 0; 2416 } else { 2417 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2418 tmp = 0; 2419 } 2420 /* Fall through to reject message */ 2421 2422 /* 2423 * If we get something weird that we aren't expecting, 2424 * reject it. 2425 */ 2426 default: 2427 if (!tmp) { 2428 printk("scsi%d: rejecting message ", instance->host_no); 2429 scsi_print_msg(extended_msg); 2430 printk("\n"); 2431 } else if (tmp != EXTENDED_MESSAGE) 2432 printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n", instance->host_no, tmp, cmd->device->id, cmd->device->lun); 2433 else 2434 printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n", instance->host_no, extended_msg[1], extended_msg[0], cmd->device->id, cmd->device->lun); 2435 2436 msgout = MESSAGE_REJECT; 2437 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2438 break; 2439 } /* switch (tmp) */ 2440 break; 2441 case PHASE_MSGOUT: 2442 len = 1; 2443 data = &msgout; 2444 hostdata->last_message = msgout; 2445 NCR5380_transfer_pio(instance, &phase, &len, &data); 2446 if (msgout == ABORT) { 2447 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2448 hostdata->connected = NULL; 2449 cmd->result = DID_ERROR << 16; 2450 collect_stats(hostdata, cmd); 2451 cmd->scsi_done(cmd); 2452 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2453 return; 2454 } 2455 msgout = NOP; 2456 break; 2457 case PHASE_CMDOUT: 2458 len = cmd->cmd_len; 2459 data = cmd->cmnd; 2460 /* 2461 * XXX for performance reasons, on machines with a 2462 * PSEUDO-DMA architecture we should probably 2463 * use the dma transfer function. 2464 */ 2465 NCR5380_transfer_pio(instance, &phase, &len, &data); 2466 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2467 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2468 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2469 return; 2470 } 2471 break; 2472 case PHASE_STATIN: 2473 len = 1; 2474 data = &tmp; 2475 NCR5380_transfer_pio(instance, &phase, &len, &data); 2476 cmd->SCp.Status = tmp; 2477 break; 2478 default: 2479 printk("scsi%d : unknown phase\n", instance->host_no); 2480 NCR5380_dprint(NDEBUG_ALL, instance); 2481 } /* switch(phase) */ 2482 } /* if (tmp * SR_REQ) */ 2483 else { 2484 /* RvC: go to sleep if polling time expired 2485 */ 2486 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2487 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2488 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2489 return; 2490 } 2491 } 2492 } /* while (1) */ 2493 } 2494 2495 /* 2496 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2497 * 2498 * Purpose : does reselection, initializing the instance->connected 2499 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2500 * nexus has been reestablished, 2501 * 2502 * Inputs : instance - this instance of the NCR5380. 2503 * 2504 * Locks: io_request_lock held by caller if IRQ driven 2505 */ 2506 2507 static void NCR5380_reselect(struct Scsi_Host *instance) { 2508 NCR5380_local_declare(); 2509 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2510 instance->hostdata; 2511 unsigned char target_mask; 2512 unsigned char lun, phase; 2513 int len; 2514 unsigned char msg[3]; 2515 unsigned char *data; 2516 Scsi_Cmnd *tmp = NULL, *prev; 2517 int abort = 0; 2518 NCR5380_setup(instance); 2519 2520 /* 2521 * Disable arbitration, etc. since the host adapter obviously 2522 * lost, and tell an interrupted NCR5380_select() to restart. 2523 */ 2524 2525 NCR5380_write(MODE_REG, MR_BASE); 2526 hostdata->restart_select = 1; 2527 2528 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2529 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); 2530 2531 /* 2532 * At this point, we have detected that our SCSI ID is on the bus, 2533 * SEL is true and BSY was false for at least one bus settle delay 2534 * (400 ns). 2535 * 2536 * We must assert BSY ourselves, until the target drops the SEL 2537 * signal. 2538 */ 2539 2540 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2541 2542 /* FIXME: timeout too long, must fail to workqueue */ 2543 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2544 abort = 1; 2545 2546 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2547 2548 /* 2549 * Wait for target to go into MSGIN. 2550 * FIXME: timeout needed and fail to work queeu 2551 */ 2552 2553 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2554 abort = 1; 2555 2556 len = 1; 2557 data = msg; 2558 phase = PHASE_MSGIN; 2559 NCR5380_transfer_pio(instance, &phase, &len, &data); 2560 2561 if (!(msg[0] & 0x80)) { 2562 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2563 scsi_print_msg(msg); 2564 abort = 1; 2565 } else { 2566 /* Accept message by clearing ACK */ 2567 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2568 lun = (msg[0] & 0x07); 2569 2570 /* 2571 * We need to add code for SCSI-II to track which devices have 2572 * I_T_L_Q nexuses established, and which have simple I_T_L 2573 * nexuses so we can chose to do additional data transfer. 2574 */ 2575 2576 /* 2577 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2578 * just reestablished, and remove it from the disconnected queue. 2579 */ 2580 2581 2582 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2583 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2584 ) { 2585 if (prev) { 2586 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2587 prev->host_scribble = tmp->host_scribble; 2588 } else { 2589 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2590 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2591 } 2592 tmp->host_scribble = NULL; 2593 break; 2594 } 2595 if (!tmp) { 2596 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2597 /* 2598 * Since we have an established nexus that we can't do anything with, 2599 * we must abort it. 2600 */ 2601 abort = 1; 2602 } 2603 } 2604 2605 if (abort) { 2606 do_abort(instance); 2607 } else { 2608 hostdata->connected = tmp; 2609 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); 2610 } 2611 } 2612 2613 /* 2614 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2615 * 2616 * Purpose : called by interrupt handler when DMA finishes or a phase 2617 * mismatch occurs (which would finish the DMA transfer). 2618 * 2619 * Inputs : instance - this instance of the NCR5380. 2620 * 2621 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2622 * nexus has been reestablished, on failure NULL is returned. 2623 */ 2624 2625 #ifdef REAL_DMA 2626 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2627 NCR5380_local_declare(); 2628 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata); 2629 int transferred; 2630 NCR5380_setup(instance); 2631 2632 /* 2633 * XXX this might not be right. 2634 * 2635 * Wait for final byte to transfer, ie wait for ACK to go false. 2636 * 2637 * We should use the Last Byte Sent bit, unfortunately this is 2638 * not available on the 5380/5381 (only the various CMOS chips) 2639 * 2640 * FIXME: timeout, and need to handle long timeout/irq case 2641 */ 2642 2643 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2644 2645 NCR5380_write(MODE_REG, MR_BASE); 2646 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2647 2648 /* 2649 * The only places we should see a phase mismatch and have to send 2650 * data from the same set of pointers will be the data transfer 2651 * phases. So, residual, requested length are only important here. 2652 */ 2653 2654 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2655 transferred = instance->dmalen - NCR5380_dma_residual(); 2656 hostdata->connected->SCp.this_residual -= transferred; 2657 hostdata->connected->SCp.ptr += transferred; 2658 } 2659 } 2660 #endif /* def REAL_DMA */ 2661 2662 /* 2663 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2664 * 2665 * Purpose : abort a command 2666 * 2667 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2668 * host byte of the result field to, if zero DID_ABORTED is 2669 * used. 2670 * 2671 * Returns : 0 - success, -1 on failure. 2672 * 2673 * XXX - there is no way to abort the command that is currently 2674 * connected, you have to wait for it to complete. If this is 2675 * a problem, we could implement longjmp() / setjmp(), setjmp() 2676 * called where the loop started in NCR5380_main(). 2677 * 2678 * Locks: host lock taken by caller 2679 */ 2680 2681 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2682 NCR5380_local_declare(); 2683 struct Scsi_Host *instance = cmd->device->host; 2684 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2685 Scsi_Cmnd *tmp, **prev; 2686 2687 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2688 scsi_print_command(cmd); 2689 2690 NCR5380_print_status(instance); 2691 2692 NCR5380_setup(instance); 2693 2694 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); 2695 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); 2696 2697 #if 0 2698 /* 2699 * Case 1 : If the command is the currently executing command, 2700 * we'll set the aborted flag and return control so that 2701 * information transfer routine can exit cleanly. 2702 */ 2703 2704 if (hostdata->connected == cmd) { 2705 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); 2706 hostdata->aborted = 1; 2707 /* 2708 * We should perform BSY checking, and make sure we haven't slipped 2709 * into BUS FREE. 2710 */ 2711 2712 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2713 /* 2714 * Since we can't change phases until we've completed the current 2715 * handshake, we have to source or sink a byte of data if the current 2716 * phase is not MSGOUT. 2717 */ 2718 2719 /* 2720 * Return control to the executing NCR drive so we can clear the 2721 * aborted flag and get back into our main loop. 2722 */ 2723 2724 return 0; 2725 } 2726 #endif 2727 2728 /* 2729 * Case 2 : If the command hasn't been issued yet, we simply remove it 2730 * from the issue queue. 2731 */ 2732 2733 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); 2734 for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) 2735 if (cmd == tmp) { 2736 REMOVE(5, *prev, tmp, tmp->host_scribble); 2737 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2738 tmp->host_scribble = NULL; 2739 tmp->result = DID_ABORT << 16; 2740 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); 2741 tmp->done(tmp); 2742 return SUCCESS; 2743 } 2744 #if (NDEBUG & NDEBUG_ABORT) 2745 /* KLL */ 2746 else if (prev == tmp) 2747 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2748 #endif 2749 2750 /* 2751 * Case 3 : If any commands are connected, we're going to fail the abort 2752 * and let the high level SCSI driver retry at a later time or 2753 * issue a reset. 2754 * 2755 * Timeouts, and therefore aborted commands, will be highly unlikely 2756 * and handling them cleanly in this situation would make the common 2757 * case of noresets less efficient, and would pollute our code. So, 2758 * we fail. 2759 */ 2760 2761 if (hostdata->connected) { 2762 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); 2763 return FAILED; 2764 } 2765 /* 2766 * Case 4: If the command is currently disconnected from the bus, and 2767 * there are no connected commands, we reconnect the I_T_L or 2768 * I_T_L_Q nexus associated with it, go into message out, and send 2769 * an abort message. 2770 * 2771 * This case is especially ugly. In order to reestablish the nexus, we 2772 * need to call NCR5380_select(). The easiest way to implement this 2773 * function was to abort if the bus was busy, and let the interrupt 2774 * handler triggered on the SEL for reselect take care of lost arbitrations 2775 * where necessary, meaning interrupts need to be enabled. 2776 * 2777 * When interrupts are enabled, the queues may change - so we 2778 * can't remove it from the disconnected queue before selecting it 2779 * because that could cause a failure in hashing the nexus if that 2780 * device reselected. 2781 * 2782 * Since the queues may change, we can't use the pointers from when we 2783 * first locate it. 2784 * 2785 * So, we must first locate the command, and if NCR5380_select() 2786 * succeeds, then issue the abort, relocate the command and remove 2787 * it from the disconnected queue. 2788 */ 2789 2790 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2791 if (cmd == tmp) { 2792 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); 2793 2794 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2795 return FAILED; 2796 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); 2797 2798 do_abort(instance); 2799 2800 for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) 2801 if (cmd == tmp) { 2802 REMOVE(5, *prev, tmp, tmp->host_scribble); 2803 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2804 tmp->host_scribble = NULL; 2805 tmp->result = DID_ABORT << 16; 2806 tmp->done(tmp); 2807 return SUCCESS; 2808 } 2809 } 2810 /* 2811 * Case 5 : If we reached this point, the command was not found in any of 2812 * the queues. 2813 * 2814 * We probably reached this point because of an unlikely race condition 2815 * between the command completing successfully and the abortion code, 2816 * so we won't panic, but we will notify the user in case something really 2817 * broke. 2818 */ 2819 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2820 " before abortion\n", instance->host_no); 2821 return FAILED; 2822 } 2823 2824 2825 /* 2826 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2827 * 2828 * Purpose : reset the SCSI bus. 2829 * 2830 * Returns : SUCCESS 2831 * 2832 * Locks: host lock taken by caller 2833 */ 2834 2835 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2836 { 2837 struct Scsi_Host *instance = cmd->device->host; 2838 2839 NCR5380_local_declare(); 2840 NCR5380_setup(instance); 2841 NCR5380_print_status(instance); 2842 2843 spin_lock_irq(instance->host_lock); 2844 do_reset(instance); 2845 spin_unlock_irq(instance->host_lock); 2846 2847 return SUCCESS; 2848 } 2849