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_ABORT 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 schedule_timeout_uninterruptible(1); 610 611 NCR5380_write(SELECT_ENABLE_REG, 0); 612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 613 614 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 615 if (trying_irqs & mask) 616 free_irq(i, NULL); 617 618 return probe_irq; 619 } 620 621 /** 622 * NCR58380_print_options - show options 623 * @instance: unused for now 624 * 625 * Called by probe code indicating the NCR5380 driver options that 626 * were selected. At some point this will switch to runtime options 627 * read from the adapter in question 628 * 629 * Locks: none 630 */ 631 632 static void __init NCR5380_print_options(struct Scsi_Host *instance) 633 { 634 printk(" generic options" 635 #ifdef AUTOPROBE_IRQ 636 " AUTOPROBE_IRQ" 637 #endif 638 #ifdef AUTOSENSE 639 " AUTOSENSE" 640 #endif 641 #ifdef DIFFERENTIAL 642 " DIFFERENTIAL" 643 #endif 644 #ifdef REAL_DMA 645 " REAL DMA" 646 #endif 647 #ifdef REAL_DMA_POLL 648 " REAL DMA POLL" 649 #endif 650 #ifdef PARITY 651 " PARITY" 652 #endif 653 #ifdef PSEUDO_DMA 654 " PSEUDO DMA" 655 #endif 656 #ifdef UNSAFE 657 " UNSAFE " 658 #endif 659 ); 660 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 661 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 662 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 663 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 664 } 665 } 666 667 /** 668 * NCR5380_print_status - dump controller info 669 * @instance: controller to dump 670 * 671 * Print commands in the various queues, called from NCR5380_abort 672 * and NCR5380_debug to aid debugging. 673 * 674 * Locks: called functions disable irqs 675 */ 676 677 static void NCR5380_print_status(struct Scsi_Host *instance) 678 { 679 NCR5380_dprint(NDEBUG_ANY, instance); 680 NCR5380_dprint_phase(NDEBUG_ANY, instance); 681 } 682 683 /******************************************/ 684 /* 685 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 686 * 687 * *buffer: I/O buffer 688 * **start: if inout == FALSE pointer into buffer where user read should start 689 * offset: current offset 690 * length: length of buffer 691 * hostno: Scsi_Host host_no 692 * inout: TRUE - user is writing; FALSE - user is reading 693 * 694 * Return the number of bytes read from or written 695 */ 696 697 #undef SPRINTF 698 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) 699 static 700 char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); 701 static 702 char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); 703 static 704 char *lprint_opcode(int opcode, char *pos, char *buffer, int length); 705 706 static 707 int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) 708 { 709 char *pos = buffer; 710 struct NCR5380_hostdata *hostdata; 711 Scsi_Cmnd *ptr; 712 713 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 714 715 if (inout) { /* Has data been written to the file ? */ 716 #ifdef DTC_PUBLIC_RELEASE 717 dtc_wmaxi = dtc_maxi = 0; 718 #endif 719 #ifdef PAS16_PUBLIC_RELEASE 720 pas_wmaxi = pas_maxi = 0; 721 #endif 722 return (-ENOSYS); /* Currently this is a no-op */ 723 } 724 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 725 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 726 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 727 #ifdef DTC_PUBLIC_RELEASE 728 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 729 #endif 730 #ifdef T128_PUBLIC_RELEASE 731 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 732 #endif 733 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 734 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 735 #endif 736 #ifdef PAS16_PUBLIC_RELEASE 737 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 738 #endif 739 740 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 741 SPRINTF("io_port: %04x ", (int) instance->io_port); 742 if (instance->irq == SCSI_IRQ_NONE) 743 SPRINTF("IRQ: None.\n"); 744 else 745 SPRINTF("IRQ: %d.\n", instance->irq); 746 747 #ifdef DTC_PUBLIC_RELEASE 748 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 749 #endif 750 #ifdef PAS16_PUBLIC_RELEASE 751 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 752 #endif 753 spin_lock_irq(instance->host_lock); 754 if (!hostdata->connected) 755 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 756 else 757 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); 758 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 759 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 760 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 761 762 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 763 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 764 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 765 spin_unlock_irq(instance->host_lock); 766 767 *start = buffer; 768 if (pos - buffer < offset) 769 return 0; 770 else if (pos - buffer - offset < length) 771 return pos - buffer - offset; 772 return length; 773 } 774 775 static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) 776 { 777 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 778 SPRINTF(" command = "); 779 pos = lprint_command(cmd->cmnd, pos, buffer, length); 780 return (pos); 781 } 782 783 static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) 784 { 785 int i, s; 786 pos = lprint_opcode(command[0], pos, buffer, length); 787 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 788 SPRINTF("%02x ", command[i]); 789 SPRINTF("\n"); 790 return (pos); 791 } 792 793 static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) 794 { 795 SPRINTF("%2d (0x%02x)", opcode, opcode); 796 return (pos); 797 } 798 799 800 /** 801 * NCR5380_init - initialise an NCR5380 802 * @instance: adapter to configure 803 * @flags: control flags 804 * 805 * Initializes *instance and corresponding 5380 chip, 806 * with flags OR'd into the initial flags value. 807 * 808 * Notes : I assume that the host, hostno, and id bits have been 809 * set correctly. I don't care about the irq and other fields. 810 * 811 * Returns 0 for success 812 * 813 * Locks: interrupts must be enabled when we are called 814 */ 815 816 static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) 817 { 818 NCR5380_local_declare(); 819 int i, pass; 820 unsigned long timeout; 821 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 822 823 if(in_interrupt()) 824 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 825 /* 826 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 827 * the base address. 828 */ 829 830 #ifdef NCR53C400 831 if (flags & FLAG_NCR53C400) 832 instance->NCR5380_instance_name += NCR53C400_address_adjust; 833 #endif 834 835 NCR5380_setup(instance); 836 837 hostdata->aborted = 0; 838 hostdata->id_mask = 1 << instance->this_id; 839 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 840 if (i > hostdata->id_mask) 841 hostdata->id_higher_mask |= i; 842 for (i = 0; i < 8; ++i) 843 hostdata->busy[i] = 0; 844 #ifdef REAL_DMA 845 hostdata->dmalen = 0; 846 #endif 847 hostdata->targets_present = 0; 848 hostdata->connected = NULL; 849 hostdata->issue_queue = NULL; 850 hostdata->disconnected_queue = NULL; 851 852 INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata); 853 854 #ifdef NCR5380_STATS 855 for (i = 0; i < 8; ++i) { 856 hostdata->time_read[i] = 0; 857 hostdata->time_write[i] = 0; 858 hostdata->bytes_read[i] = 0; 859 hostdata->bytes_write[i] = 0; 860 } 861 hostdata->timebase = 0; 862 hostdata->pendingw = 0; 863 hostdata->pendingr = 0; 864 #endif 865 866 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 867 if (flags & FLAG_NCR53C400) 868 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 869 else 870 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 871 872 hostdata->host = instance; 873 hostdata->time_expires = 0; 874 875 #ifndef AUTOSENSE 876 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 877 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 878 " be incorrectly cleared.\n", instance->host_no); 879 #endif /* def AUTOSENSE */ 880 881 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 882 NCR5380_write(MODE_REG, MR_BASE); 883 NCR5380_write(TARGET_COMMAND_REG, 0); 884 NCR5380_write(SELECT_ENABLE_REG, 0); 885 886 #ifdef NCR53C400 887 if (hostdata->flags & FLAG_NCR53C400) { 888 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 889 } 890 #endif 891 892 /* 893 * Detect and correct bus wedge problems. 894 * 895 * If the system crashed, it may have crashed in a state 896 * where a SCSI command was still executing, and the 897 * SCSI bus is not in a BUS FREE STATE. 898 * 899 * If this is the case, we'll try to abort the currently 900 * established nexus which we know nothing about, and that 901 * failing, do a hard reset of the SCSI bus 902 */ 903 904 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 905 switch (pass) { 906 case 1: 907 case 3: 908 case 5: 909 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 910 timeout = jiffies + 5 * HZ; 911 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 912 break; 913 case 2: 914 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 915 do_abort(instance); 916 break; 917 case 4: 918 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 919 do_reset(instance); 920 break; 921 case 6: 922 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 923 return -ENXIO; 924 } 925 } 926 return 0; 927 } 928 929 /** 930 * NCR5380_exit - remove an NCR5380 931 * @instance: adapter to remove 932 */ 933 934 static void __devexit NCR5380_exit(struct Scsi_Host *instance) 935 { 936 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 937 938 cancel_delayed_work(&hostdata->coroutine); 939 flush_scheduled_work(); 940 } 941 942 /** 943 * NCR5380_queue_command - queue a command 944 * @cmd: SCSI command 945 * @done: completion handler 946 * 947 * cmd is added to the per instance issue_queue, with minor 948 * twiddling done to the host specific fields of cmd. If the 949 * main coroutine is not running, it is restarted. 950 * 951 * Locks: host lock taken by caller 952 */ 953 954 static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 955 { 956 struct Scsi_Host *instance = cmd->device->host; 957 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 958 Scsi_Cmnd *tmp; 959 960 #if (NDEBUG & NDEBUG_NO_WRITE) 961 switch (cmd->cmnd[0]) { 962 case WRITE_6: 963 case WRITE_10: 964 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 965 cmd->result = (DID_ERROR << 16); 966 done(cmd); 967 return 0; 968 } 969 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 970 971 #ifdef NCR5380_STATS 972 switch (cmd->cmnd[0]) { 973 case WRITE: 974 case WRITE_6: 975 case WRITE_10: 976 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 977 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; 978 hostdata->pendingw++; 979 break; 980 case READ: 981 case READ_6: 982 case READ_10: 983 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 984 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; 985 hostdata->pendingr++; 986 break; 987 } 988 #endif 989 990 /* 991 * We use the host_scribble field as a pointer to the next command 992 * in a queue 993 */ 994 995 cmd->host_scribble = NULL; 996 cmd->scsi_done = done; 997 cmd->result = 0; 998 999 /* 1000 * Insert the cmd into the issue queue. Note that REQUEST SENSE 1001 * commands are added to the head of the queue since any command will 1002 * clear the contingent allegiance condition that exists and the 1003 * sense data is only guaranteed to be valid while the condition exists. 1004 */ 1005 1006 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1007 LIST(cmd, hostdata->issue_queue); 1008 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 1009 hostdata->issue_queue = cmd; 1010 } else { 1011 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 1012 LIST(cmd, tmp); 1013 tmp->host_scribble = (unsigned char *) cmd; 1014 } 1015 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); 1016 1017 /* Run the coroutine if it isn't already running. */ 1018 /* Kick off command processing */ 1019 schedule_work(&hostdata->coroutine); 1020 return 0; 1021 } 1022 1023 1024 /** 1025 * NCR5380_main - NCR state machines 1026 * 1027 * NCR5380_main is a coroutine that runs as long as more work can 1028 * be done on the NCR5380 host adapters in a system. Both 1029 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1030 * in case it is not running. 1031 * 1032 * Locks: called as its own thread with no locks held. Takes the 1033 * host lock and called routines may take the isa dma lock. 1034 */ 1035 1036 static void NCR5380_main(void *p) 1037 { 1038 struct NCR5380_hostdata *hostdata = p; 1039 struct Scsi_Host *instance = hostdata->host; 1040 Scsi_Cmnd *tmp, *prev; 1041 int done; 1042 1043 spin_lock_irq(instance->host_lock); 1044 do { 1045 /* Lock held here */ 1046 done = 1; 1047 if (!hostdata->connected && !hostdata->selecting) { 1048 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); 1049 /* 1050 * Search through the issue_queue for a command destined 1051 * for a target that's not busy. 1052 */ 1053 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1054 { 1055 if (prev != tmp) 1056 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); 1057 /* When we find one, remove it from the issue queue. */ 1058 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1059 if (prev) { 1060 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1061 prev->host_scribble = tmp->host_scribble; 1062 } else { 1063 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1064 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1065 } 1066 tmp->host_scribble = NULL; 1067 1068 /* 1069 * Attempt to establish an I_T_L nexus here. 1070 * On success, instance->hostdata->connected is set. 1071 * On failure, we must add the command back to the 1072 * issue queue so we can keep trying. 1073 */ 1074 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)); 1075 1076 /* 1077 * A successful selection is defined as one that 1078 * leaves us with the command connected and 1079 * in hostdata->connected, OR has terminated the 1080 * command. 1081 * 1082 * With successful commands, we fall through 1083 * and see if we can do an information transfer, 1084 * with failures we will restart. 1085 */ 1086 hostdata->selecting = NULL; 1087 /* RvC: have to preset this to indicate a new command is being performed */ 1088 1089 if (!NCR5380_select(instance, tmp, 1090 /* 1091 * REQUEST SENSE commands are issued without tagged 1092 * queueing, even on SCSI-II devices because the 1093 * contingent allegiance condition exists for the 1094 * entire unit. 1095 */ 1096 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1097 break; 1098 } else { 1099 LIST(tmp, hostdata->issue_queue); 1100 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1101 hostdata->issue_queue = tmp; 1102 done = 0; 1103 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); 1104 } 1105 /* lock held here still */ 1106 } /* if target/lun is not busy */ 1107 } /* for */ 1108 /* exited locked */ 1109 } /* if (!hostdata->connected) */ 1110 if (hostdata->selecting) { 1111 tmp = (Scsi_Cmnd *) hostdata->selecting; 1112 /* Selection will drop and retake the lock */ 1113 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1114 /* Ok ?? */ 1115 } else { 1116 /* RvC: device failed, so we wait a long time 1117 this is needed for Mustek scanners, that 1118 do not respond to commands immediately 1119 after a scan */ 1120 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1121 LIST(tmp, hostdata->issue_queue); 1122 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1123 hostdata->issue_queue = tmp; 1124 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1125 } 1126 } /* if hostdata->selecting */ 1127 if (hostdata->connected 1128 #ifdef REAL_DMA 1129 && !hostdata->dmalen 1130 #endif 1131 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1132 ) { 1133 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); 1134 NCR5380_information_transfer(instance); 1135 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); 1136 done = 0; 1137 } else 1138 break; 1139 } while (!done); 1140 1141 spin_unlock_irq(instance->host_lock); 1142 } 1143 1144 #ifndef DONT_USE_INTR 1145 1146 /** 1147 * NCR5380_intr - generic NCR5380 irq handler 1148 * @irq: interrupt number 1149 * @dev_id: device info 1150 * @regs: registers (unused) 1151 * 1152 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1153 * from the disconnected queue, and restarting NCR5380_main() 1154 * as required. 1155 * 1156 * Locks: takes the needed instance locks 1157 */ 1158 1159 static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) 1160 { 1161 NCR5380_local_declare(); 1162 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; 1163 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1164 int done; 1165 unsigned char basr; 1166 unsigned long flags; 1167 1168 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq)); 1169 1170 do { 1171 done = 1; 1172 spin_lock_irqsave(instance->host_lock, flags); 1173 /* Look for pending interrupts */ 1174 NCR5380_setup(instance); 1175 basr = NCR5380_read(BUS_AND_STATUS_REG); 1176 /* XXX dispatch to appropriate routine if found and done=0 */ 1177 if (basr & BASR_IRQ) { 1178 NCR5380_dprint(NDEBUG_INTR, instance); 1179 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1180 done = 0; 1181 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); 1182 NCR5380_reselect(instance); 1183 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1184 } else if (basr & BASR_PARITY_ERROR) { 1185 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); 1186 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1187 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1188 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); 1189 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1190 } else { 1191 #if defined(REAL_DMA) 1192 /* 1193 * We should only get PHASE MISMATCH and EOP interrupts 1194 * if we have DMA enabled, so do a sanity check based on 1195 * the current setting of the MODE register. 1196 */ 1197 1198 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1199 int transfered; 1200 1201 if (!hostdata->connected) 1202 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1203 1204 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1205 hostdata->connected->SCp.this_residual -= transferred; 1206 hostdata->connected->SCp.ptr += transferred; 1207 hostdata->dmalen = 0; 1208 1209 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1210 1211 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1212 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1213 1214 NCR5380_write(MODE_REG, MR_BASE); 1215 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1216 } 1217 #else 1218 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))); 1219 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1220 #endif 1221 } 1222 } /* if BASR_IRQ */ 1223 spin_unlock_irqrestore(instance->host_lock, flags); 1224 if(!done) 1225 schedule_work(&hostdata->coroutine); 1226 } while (!done); 1227 return IRQ_HANDLED; 1228 } 1229 1230 #endif 1231 1232 /** 1233 * collect_stats - collect stats on a scsi command 1234 * @hostdata: adapter 1235 * @cmd: command being issued 1236 * 1237 * Update the statistical data by parsing the command in question 1238 */ 1239 1240 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1241 { 1242 #ifdef NCR5380_STATS 1243 switch (cmd->cmnd[0]) { 1244 case WRITE: 1245 case WRITE_6: 1246 case WRITE_10: 1247 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1248 hostdata->pendingw--; 1249 break; 1250 case READ: 1251 case READ_6: 1252 case READ_10: 1253 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1254 hostdata->pendingr--; 1255 break; 1256 } 1257 #endif 1258 } 1259 1260 1261 /* 1262 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1263 * int tag); 1264 * 1265 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1266 * including ARBITRATION, SELECTION, and initial message out for 1267 * IDENTIFY and queue messages. 1268 * 1269 * Inputs : instance - instantiation of the 5380 driver on which this 1270 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1271 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1272 * the command that is presently connected. 1273 * 1274 * Returns : -1 if selection could not execute for some reason, 1275 * 0 if selection succeeded or failed because the target 1276 * did not respond. 1277 * 1278 * Side effects : 1279 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1280 * with registers as they should have been on entry - ie 1281 * SELECT_ENABLE will be set appropriately, the NCR5380 1282 * will cease to drive any SCSI bus signals. 1283 * 1284 * If successful : I_T_L or I_T_L_Q nexus will be established, 1285 * instance->connected will be set to cmd. 1286 * SELECT interrupt will be disabled. 1287 * 1288 * If failed (no target) : cmd->scsi_done() will be called, and the 1289 * cmd->result host byte set to DID_BAD_TARGET. 1290 * 1291 * Locks: caller holds hostdata lock in IRQ mode 1292 */ 1293 1294 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1295 { 1296 NCR5380_local_declare(); 1297 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1298 unsigned char tmp[3], phase; 1299 unsigned char *data; 1300 int len; 1301 unsigned long timeout; 1302 unsigned char value; 1303 int err; 1304 NCR5380_setup(instance); 1305 1306 if (hostdata->selecting) 1307 goto part2; 1308 1309 hostdata->restart_select = 0; 1310 1311 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1312 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); 1313 1314 /* 1315 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1316 * data bus during SELECTION. 1317 */ 1318 1319 NCR5380_write(TARGET_COMMAND_REG, 0); 1320 1321 /* 1322 * Start arbitration. 1323 */ 1324 1325 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1326 NCR5380_write(MODE_REG, MR_ARBITRATE); 1327 1328 1329 /* We can be relaxed here, interrupts are on, we are 1330 in workqueue context, the birds are singing in the trees */ 1331 spin_unlock_irq(instance->host_lock); 1332 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1333 spin_lock_irq(instance->host_lock); 1334 if (err < 0) { 1335 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1336 NCR5380_write(MODE_REG, MR_BASE); 1337 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1338 goto failed; 1339 } 1340 1341 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); 1342 1343 /* 1344 * The arbitration delay is 2.2us, but this is a minimum and there is 1345 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1346 * the integral nature of udelay(). 1347 * 1348 */ 1349 1350 udelay(3); 1351 1352 /* Check for lost arbitration */ 1353 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)) { 1354 NCR5380_write(MODE_REG, MR_BASE); 1355 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); 1356 goto failed; 1357 } 1358 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1359 1360 if (!(hostdata->flags & FLAG_DTC3181E) && 1361 /* RvC: DTC3181E has some trouble with this 1362 * so we simply removed it. Seems to work with 1363 * only Mustek scanner attached 1364 */ 1365 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1366 NCR5380_write(MODE_REG, MR_BASE); 1367 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1368 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); 1369 goto failed; 1370 } 1371 /* 1372 * Again, bus clear + bus settle time is 1.2us, however, this is 1373 * a minimum so we'll udelay ceil(1.2) 1374 */ 1375 1376 udelay(2); 1377 1378 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); 1379 1380 /* 1381 * Now that we have won arbitration, start Selection process, asserting 1382 * the host and target ID's on the SCSI bus. 1383 */ 1384 1385 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); 1386 1387 /* 1388 * Raise ATN while SEL is true before BSY goes false from arbitration, 1389 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1390 * phase immediately after selection. 1391 */ 1392 1393 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1394 NCR5380_write(MODE_REG, MR_BASE); 1395 1396 /* 1397 * Reselect interrupts must be turned off prior to the dropping of BSY, 1398 * otherwise we will trigger an interrupt. 1399 */ 1400 NCR5380_write(SELECT_ENABLE_REG, 0); 1401 1402 /* 1403 * The initiator shall then wait at least two deskew delays and release 1404 * the BSY signal. 1405 */ 1406 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1407 1408 /* Reset BSY */ 1409 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1410 1411 /* 1412 * Something weird happens when we cease to drive BSY - looks 1413 * like the board/chip is letting us do another read before the 1414 * appropriate propagation delay has expired, and we're confusing 1415 * a BSY signal from ourselves as the target's response to SELECTION. 1416 * 1417 * A small delay (the 'C++' frontend breaks the pipeline with an 1418 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1419 * tighter 'C' code breaks and requires this) solves the problem - 1420 * the 1 us delay is arbitrary, and only used because this delay will 1421 * be the same on other platforms and since it works here, it should 1422 * work there. 1423 * 1424 * wingel suggests that this could be due to failing to wait 1425 * one deskew delay. 1426 */ 1427 1428 udelay(1); 1429 1430 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); 1431 1432 /* 1433 * The SCSI specification calls for a 250 ms timeout for the actual 1434 * selection. 1435 */ 1436 1437 timeout = jiffies + (250 * HZ / 1000); 1438 1439 /* 1440 * XXX very interesting - we're seeing a bounce where the BSY we 1441 * asserted is being reflected / still asserted (propagation delay?) 1442 * and it's detecting as true. Sigh. 1443 */ 1444 1445 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1446 hostdata->selecting = cmd; 1447 1448 part2: 1449 /* RvC: here we enter after a sleeping period, or immediately after 1450 execution of part 1 1451 we poll only once ech clock tick */ 1452 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1453 1454 if (!value && (hostdata->select_time < HZ/4)) { 1455 /* RvC: we still must wait for a device response */ 1456 hostdata->select_time++; /* after 25 ticks the device has failed */ 1457 NCR5380_set_timer(hostdata, 1); 1458 return 0; /* RvC: we return here with hostdata->selecting set, 1459 to go to sleep */ 1460 } 1461 1462 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1463 waiting period */ 1464 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1465 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1466 NCR5380_reselect(instance); 1467 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1468 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1469 return -1; 1470 } 1471 /* 1472 * No less than two deskew delays after the initiator detects the 1473 * BSY signal is true, it shall release the SEL signal and may 1474 * change the DATA BUS. -wingel 1475 */ 1476 1477 udelay(1); 1478 1479 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1480 1481 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1482 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1483 if (hostdata->targets_present & (1 << scmd_id(cmd))) { 1484 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1485 if (hostdata->restart_select) 1486 printk(KERN_DEBUG "\trestart select\n"); 1487 NCR5380_dprint(NDEBUG_SELECTION, instance); 1488 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1489 return -1; 1490 } 1491 cmd->result = DID_BAD_TARGET << 16; 1492 collect_stats(hostdata, cmd); 1493 cmd->scsi_done(cmd); 1494 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1495 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); 1496 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1497 return 0; 1498 } 1499 hostdata->targets_present |= (1 << scmd_id(cmd)); 1500 1501 /* 1502 * Since we followed the SCSI spec, and raised ATN while SEL 1503 * was true but before BSY was false during selection, the information 1504 * transfer phase should be a MESSAGE OUT phase so that we can send the 1505 * IDENTIFY message. 1506 * 1507 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1508 * message (2 bytes) with a tag ID that we increment with every command 1509 * until it wraps back to 0. 1510 * 1511 * XXX - it turns out that there are some broken SCSI-II devices, 1512 * which claim to support tagged queuing but fail when more than 1513 * some number of commands are issued at once. 1514 */ 1515 1516 /* Wait for start of REQ/ACK handshake */ 1517 1518 spin_unlock_irq(instance->host_lock); 1519 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1520 spin_lock_irq(instance->host_lock); 1521 1522 if(err) { 1523 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1524 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1525 goto failed; 1526 } 1527 1528 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); 1529 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1530 1531 len = 1; 1532 cmd->tag = 0; 1533 1534 /* Send message(s) */ 1535 data = tmp; 1536 phase = PHASE_MSGOUT; 1537 NCR5380_transfer_pio(instance, &phase, &len, &data); 1538 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); 1539 /* XXX need to handle errors here */ 1540 hostdata->connected = cmd; 1541 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1542 1543 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { 1544 initialize_SCp(cmd); 1545 } 1546 1547 return 0; 1548 1549 /* Selection failed */ 1550 failed: 1551 return -1; 1552 1553 } 1554 1555 /* 1556 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1557 * unsigned char *phase, int *count, unsigned char **data) 1558 * 1559 * Purpose : transfers data in given phase using polled I/O 1560 * 1561 * Inputs : instance - instance of driver, *phase - pointer to 1562 * what phase is expected, *count - pointer to number of 1563 * bytes to transfer, **data - pointer to data pointer. 1564 * 1565 * Returns : -1 when different phase is entered without transferring 1566 * maximum number of bytes, 0 if all bytes or transfered or exit 1567 * is in same phase. 1568 * 1569 * Also, *phase, *count, *data are modified in place. 1570 * 1571 * XXX Note : handling for bus free may be useful. 1572 */ 1573 1574 /* 1575 * Note : this code is not as quick as it could be, however it 1576 * IS 100% reliable, and for the actual data transfer where speed 1577 * counts, we will always do a pseudo DMA or DMA transfer. 1578 */ 1579 1580 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1581 NCR5380_local_declare(); 1582 unsigned char p = *phase, tmp; 1583 int c = *count; 1584 unsigned char *d = *data; 1585 /* 1586 * RvC: some administrative data to process polling time 1587 */ 1588 int break_allowed = 0; 1589 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1590 NCR5380_setup(instance); 1591 1592 if (!(p & SR_IO)) 1593 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); 1594 else 1595 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); 1596 1597 /* 1598 * The NCR5380 chip will only drive the SCSI bus when the 1599 * phase specified in the appropriate bits of the TARGET COMMAND 1600 * REGISTER match the STATUS REGISTER 1601 */ 1602 1603 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1604 1605 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1606 * so breaks are not necessary there 1607 */ 1608 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1609 break_allowed = 1; 1610 } 1611 do { 1612 /* 1613 * Wait for assertion of REQ, after which the phase bits will be 1614 * valid 1615 */ 1616 1617 /* RvC: we simply poll once, after that we stop temporarily 1618 * and let the device buffer fill up 1619 * if breaking is not allowed, we keep polling as long as needed 1620 */ 1621 1622 /* FIXME */ 1623 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1624 if (!(tmp & SR_REQ)) { 1625 /* timeout condition */ 1626 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1627 break; 1628 } 1629 1630 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); 1631 1632 /* Check for phase mismatch */ 1633 if ((tmp & PHASE_MASK) != p) { 1634 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); 1635 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1636 break; 1637 } 1638 /* Do actual transfer from SCSI bus to / from memory */ 1639 if (!(p & SR_IO)) 1640 NCR5380_write(OUTPUT_DATA_REG, *d); 1641 else 1642 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1643 1644 ++d; 1645 1646 /* 1647 * The SCSI standard suggests that in MSGOUT phase, the initiator 1648 * should drop ATN on the last byte of the message phase 1649 * after REQ has been asserted for the handshake but before 1650 * the initiator raises ACK. 1651 */ 1652 1653 if (!(p & SR_IO)) { 1654 if (!((p & SR_MSG) && c > 1)) { 1655 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1656 NCR5380_dprint(NDEBUG_PIO, instance); 1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1658 } else { 1659 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1660 NCR5380_dprint(NDEBUG_PIO, instance); 1661 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1662 } 1663 } else { 1664 NCR5380_dprint(NDEBUG_PIO, instance); 1665 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1666 } 1667 1668 /* FIXME - if this fails bus reset ?? */ 1669 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1670 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); 1671 1672 /* 1673 * We have several special cases to consider during REQ/ACK handshaking : 1674 * 1. We were in MSGOUT phase, and we are on the last byte of the 1675 * message. ATN must be dropped as ACK is dropped. 1676 * 1677 * 2. We are in a MSGIN phase, and we are on the last byte of the 1678 * message. We must exit with ACK asserted, so that the calling 1679 * code may raise ATN before dropping ACK to reject the message. 1680 * 1681 * 3. ACK and ATN are clear and the target may proceed as normal. 1682 */ 1683 if (!(p == PHASE_MSGIN && c == 1)) { 1684 if (p == PHASE_MSGOUT && c > 1) 1685 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1686 else 1687 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1688 } 1689 } while (--c); 1690 1691 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); 1692 1693 *count = c; 1694 *data = d; 1695 tmp = NCR5380_read(STATUS_REG); 1696 if (tmp & SR_REQ) 1697 *phase = tmp & PHASE_MASK; 1698 else 1699 *phase = PHASE_UNKNOWN; 1700 1701 if (!c || (*phase == p)) 1702 return 0; 1703 else 1704 return -1; 1705 } 1706 1707 /** 1708 * do_reset - issue a reset command 1709 * @host: adapter to reset 1710 * 1711 * Issue a reset sequence to the NCR5380 and try and get the bus 1712 * back into sane shape. 1713 * 1714 * Locks: caller holds queue lock 1715 */ 1716 1717 static void do_reset(struct Scsi_Host *host) { 1718 NCR5380_local_declare(); 1719 NCR5380_setup(host); 1720 1721 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1722 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1723 udelay(25); 1724 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1725 } 1726 1727 /* 1728 * Function : do_abort (Scsi_Host *host) 1729 * 1730 * Purpose : abort the currently established nexus. Should only be 1731 * called from a routine which can drop into a 1732 * 1733 * Returns : 0 on success, -1 on failure. 1734 * 1735 * Locks: queue lock held by caller 1736 * FIXME: sort this out and get new_eh running 1737 */ 1738 1739 static int do_abort(struct Scsi_Host *host) { 1740 NCR5380_local_declare(); 1741 unsigned char *msgptr, phase, tmp; 1742 int len; 1743 int rc; 1744 NCR5380_setup(host); 1745 1746 1747 /* Request message out phase */ 1748 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1749 1750 /* 1751 * Wait for the target to indicate a valid phase by asserting 1752 * REQ. Once this happens, we'll have either a MSGOUT phase 1753 * and can immediately send the ABORT message, or we'll have some 1754 * other phase and will have to source/sink data. 1755 * 1756 * We really don't care what value was on the bus or what value 1757 * the target sees, so we just handshake. 1758 */ 1759 1760 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1761 1762 if(rc < 0) 1763 return -1; 1764 1765 tmp = (unsigned char)rc; 1766 1767 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1768 1769 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1770 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1771 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1772 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1773 if(rc == -1) 1774 return -1; 1775 } 1776 tmp = ABORT; 1777 msgptr = &tmp; 1778 len = 1; 1779 phase = PHASE_MSGOUT; 1780 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1781 1782 /* 1783 * If we got here, and the command completed successfully, 1784 * we're about to go into bus free state. 1785 */ 1786 1787 return len ? -1 : 0; 1788 } 1789 1790 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1791 /* 1792 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1793 * unsigned char *phase, int *count, unsigned char **data) 1794 * 1795 * Purpose : transfers data in given phase using either real 1796 * or pseudo DMA. 1797 * 1798 * Inputs : instance - instance of driver, *phase - pointer to 1799 * what phase is expected, *count - pointer to number of 1800 * bytes to transfer, **data - pointer to data pointer. 1801 * 1802 * Returns : -1 when different phase is entered without transferring 1803 * maximum number of bytes, 0 if all bytes or transfered or exit 1804 * is in same phase. 1805 * 1806 * Also, *phase, *count, *data are modified in place. 1807 * 1808 * Locks: io_request lock held by caller 1809 */ 1810 1811 1812 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1813 NCR5380_local_declare(); 1814 register int c = *count; 1815 register unsigned char p = *phase; 1816 register unsigned char *d = *data; 1817 unsigned char tmp; 1818 int foo; 1819 #if defined(REAL_DMA_POLL) 1820 int cnt, toPIO; 1821 unsigned char saved_data = 0, overrun = 0, residue; 1822 #endif 1823 1824 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1825 1826 NCR5380_setup(instance); 1827 1828 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1829 *phase = tmp; 1830 return -1; 1831 } 1832 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1833 #ifdef READ_OVERRUNS 1834 if (p & SR_IO) { 1835 c -= 2; 1836 } 1837 #endif 1838 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)); 1839 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1840 #endif 1841 1842 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1843 1844 #ifdef REAL_DMA 1845 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1846 #elif defined(REAL_DMA_POLL) 1847 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1848 #else 1849 /* 1850 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1851 * were not disabled for the duration of a single DMA transfer, from 1852 * before the setting of DMA mode to after transfer of the last byte. 1853 */ 1854 1855 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1856 spin_unlock_irq(instance->host_lock); 1857 #endif 1858 /* KLL May need eop and parity in 53c400 */ 1859 if (hostdata->flags & FLAG_NCR53C400) 1860 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); 1861 else 1862 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1863 #endif /* def REAL_DMA */ 1864 1865 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1866 1867 /* 1868 * On the PAS16 at least I/O recovery delays are not needed here. 1869 * Everyone else seems to want them. 1870 */ 1871 1872 if (p & SR_IO) { 1873 io_recovery_delay(1); 1874 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1875 } else { 1876 io_recovery_delay(1); 1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1878 io_recovery_delay(1); 1879 NCR5380_write(START_DMA_SEND_REG, 0); 1880 io_recovery_delay(1); 1881 } 1882 1883 #if defined(REAL_DMA_POLL) 1884 do { 1885 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1886 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1887 1888 /* 1889 At this point, either we've completed DMA, or we have a phase mismatch, 1890 or we've unexpectedly lost BUSY (which is a real error). 1891 1892 For write DMAs, we want to wait until the last byte has been 1893 transferred out over the bus before we turn off DMA mode. Alas, there 1894 seems to be no terribly good way of doing this on a 5380 under all 1895 conditions. For non-scatter-gather operations, we can wait until REQ 1896 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1897 are nastier, since the device will be expecting more data than we 1898 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1899 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1900 why this signal was added to the newer chips) but on the older 538[01] 1901 this signal does not exist. The workaround for this lack is a watchdog; 1902 we bail out of the wait-loop after a modest amount of wait-time if 1903 the usual exit conditions are not met. Not a terribly clean or 1904 correct solution :-% 1905 1906 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1907 If the chip is in DMA mode for an READ, it will respond to a target's 1908 REQ by latching the SCSI data into the INPUT DATA register and asserting 1909 ACK, even if it has _already_ been notified by the DMA controller that 1910 the current DMA transfer has completed! If the NCR5380 is then taken 1911 out of DMA mode, this already-acknowledged byte is lost. 1912 1913 This is not a problem for "one DMA transfer per command" reads, because 1914 the situation will never arise... either all of the data is DMA'ed 1915 properly, or the target switches to MESSAGE IN phase to signal a 1916 disconnection (either operation bringing the DMA to a clean halt). 1917 However, in order to handle scatter-reads, we must work around the 1918 problem. The chosen fix is to DMA N-2 bytes, then check for the 1919 condition before taking the NCR5380 out of DMA mode. One or two extra 1920 bytes are transferred via PIO as necessary to fill out the original 1921 request. 1922 */ 1923 1924 if (p & SR_IO) { 1925 #ifdef READ_OVERRUNS 1926 udelay(10); 1927 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1928 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1929 overrun = 1; 1930 } 1931 #endif 1932 } else { 1933 int limit = 100; 1934 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1935 if (!(tmp & BASR_PHASE_MATCH)) 1936 break; 1937 if (--limit < 0) 1938 break; 1939 } 1940 } 1941 1942 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1943 1944 NCR5380_write(MODE_REG, MR_BASE); 1945 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1946 1947 residue = NCR5380_dma_residual(instance); 1948 c -= residue; 1949 *count -= c; 1950 *data += c; 1951 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1952 1953 #ifdef READ_OVERRUNS 1954 if (*phase == p && (p & SR_IO) && residue == 0) { 1955 if (overrun) { 1956 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1957 **data = saved_data; 1958 *data += 1; 1959 *count -= 1; 1960 cnt = toPIO = 1; 1961 } else { 1962 printk("No overrun??\n"); 1963 cnt = toPIO = 2; 1964 } 1965 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1966 NCR5380_transfer_pio(instance, phase, &cnt, data); 1967 *count -= toPIO - cnt; 1968 } 1969 #endif 1970 1971 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))); 1972 return 0; 1973 1974 #elif defined(REAL_DMA) 1975 return 0; 1976 #else /* defined(REAL_DMA_POLL) */ 1977 if (p & SR_IO) { 1978 #ifdef DMA_WORKS_RIGHT 1979 foo = NCR5380_pread(instance, d, c); 1980 #else 1981 int diff = 1; 1982 if (hostdata->flags & FLAG_NCR53C400) { 1983 diff = 0; 1984 } 1985 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1986 /* 1987 * We can't disable DMA mode after successfully transferring 1988 * what we plan to be the last byte, since that would open up 1989 * a race condition where if the target asserted REQ before 1990 * we got the DMA mode reset, the NCR5380 would have latched 1991 * an additional byte into the INPUT DATA register and we'd 1992 * have dropped it. 1993 * 1994 * The workaround was to transfer one fewer bytes than we 1995 * intended to with the pseudo-DMA read function, wait for 1996 * the chip to latch the last byte, read it, and then disable 1997 * pseudo-DMA mode. 1998 * 1999 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 2000 * REQ is deasserted when ACK is asserted, and not reasserted 2001 * until ACK goes false. Since the NCR5380 won't lower ACK 2002 * until DACK is asserted, which won't happen unless we twiddle 2003 * the DMA port or we take the NCR5380 out of DMA mode, we 2004 * can guarantee that we won't handshake another extra 2005 * byte. 2006 */ 2007 2008 if (!(hostdata->flags & FLAG_NCR53C400)) { 2009 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2010 /* Wait for clean handshake */ 2011 while (NCR5380_read(STATUS_REG) & SR_REQ); 2012 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2013 } 2014 } 2015 #endif 2016 } else { 2017 #ifdef DMA_WORKS_RIGHT 2018 foo = NCR5380_pwrite(instance, d, c); 2019 #else 2020 int timeout; 2021 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2022 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2023 /* 2024 * Wait for the last byte to be sent. If REQ is being asserted for 2025 * the byte we're interested, we'll ACK it and it will go false. 2026 */ 2027 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2028 timeout = 20000; 2029 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2030 2031 if (!timeout) 2032 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2033 2034 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2035 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2036 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2037 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2038 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2039 } 2040 } 2041 } else { 2042 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2043 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2044 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2045 } 2046 } 2047 #endif 2048 } 2049 NCR5380_write(MODE_REG, MR_BASE); 2050 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2051 2052 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2053 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2054 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2056 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2057 } else { 2058 printk("53C400w: IRQ NOT THERE!\n"); 2059 } 2060 } 2061 *data = d + c; 2062 *count = 0; 2063 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2064 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2065 spin_lock_irq(instance->host_lock); 2066 #endif /* defined(REAL_DMA_POLL) */ 2067 return foo; 2068 #endif /* def REAL_DMA */ 2069 } 2070 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2071 2072 /* 2073 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2074 * 2075 * Purpose : run through the various SCSI phases and do as the target 2076 * directs us to. Operates on the currently connected command, 2077 * instance->connected. 2078 * 2079 * Inputs : instance, instance for which we are doing commands 2080 * 2081 * Side effects : SCSI things happen, the disconnected queue will be 2082 * modified if a command disconnects, *instance->connected will 2083 * change. 2084 * 2085 * XXX Note : we need to watch for bus free or a reset condition here 2086 * to recover from an unexpected bus free condition. 2087 * 2088 * Locks: io_request_lock held by caller in IRQ mode 2089 */ 2090 2091 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2092 NCR5380_local_declare(); 2093 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2094 unsigned char msgout = NOP; 2095 int sink = 0; 2096 int len; 2097 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2098 int transfersize; 2099 #endif 2100 unsigned char *data; 2101 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2102 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2103 /* RvC: we need to set the end of the polling time */ 2104 unsigned long poll_time = jiffies + USLEEP_POLL; 2105 2106 NCR5380_setup(instance); 2107 2108 while (1) { 2109 tmp = NCR5380_read(STATUS_REG); 2110 /* We only have a valid SCSI phase when REQ is asserted */ 2111 if (tmp & SR_REQ) { 2112 phase = (tmp & PHASE_MASK); 2113 if (phase != old_phase) { 2114 old_phase = phase; 2115 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2116 } 2117 if (sink && (phase != PHASE_MSGOUT)) { 2118 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2119 2120 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2121 while (NCR5380_read(STATUS_REG) & SR_REQ); 2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2123 sink = 0; 2124 continue; 2125 } 2126 switch (phase) { 2127 case PHASE_DATAIN: 2128 case PHASE_DATAOUT: 2129 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2130 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2131 sink = 1; 2132 do_abort(instance); 2133 cmd->result = DID_ERROR << 16; 2134 cmd->done(cmd); 2135 return; 2136 #endif 2137 /* 2138 * If there is no room left in the current buffer in the 2139 * scatter-gather list, move onto the next one. 2140 */ 2141 2142 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2143 ++cmd->SCp.buffer; 2144 --cmd->SCp.buffers_residual; 2145 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2146 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 2147 cmd->SCp.buffer->offset; 2148 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2149 } 2150 /* 2151 * The preferred transfer method is going to be 2152 * PSEUDO-DMA for systems that are strictly PIO, 2153 * since we can let the hardware do the handshaking. 2154 * 2155 * For this to work, we need to know the transfersize 2156 * ahead of time, since the pseudo-DMA code will sit 2157 * in an unconditional loop. 2158 */ 2159 2160 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2161 /* KLL 2162 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2163 * driver then it will always be defined, so the 2164 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2165 * NCR5380 case. I think this is a fairly clean solution. 2166 * We supplement these 2 if's with the flag. 2167 */ 2168 #ifdef NCR5380_dma_xfer_len 2169 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2170 #else 2171 transfersize = cmd->transfersize; 2172 2173 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2174 if (transfersize > 512) 2175 transfersize = 512; 2176 #endif /* LIMIT_TRANSFERSIZE */ 2177 2178 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2179 /* Limit transfers to 32K, for xx400 & xx406 2180 * pseudoDMA that transfers in 128 bytes blocks. */ 2181 if (transfersize > 32 * 1024) 2182 transfersize = 32 * 1024; 2183 #endif 2184 len = transfersize; 2185 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2186 /* 2187 * If the watchdog timer fires, all future accesses to this 2188 * device will use the polled-IO. 2189 */ 2190 scmd_printk(KERN_INFO, cmd, 2191 "switching to slow handshake\n"); 2192 cmd->device->borken = 1; 2193 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2194 sink = 1; 2195 do_abort(instance); 2196 cmd->result = DID_ERROR << 16; 2197 cmd->done(cmd); 2198 /* XXX - need to source or sink data here, as appropriate */ 2199 } else 2200 cmd->SCp.this_residual -= transfersize - len; 2201 } else 2202 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2203 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2204 &cmd->SCp.ptr); 2205 break; 2206 case PHASE_MSGIN: 2207 len = 1; 2208 data = &tmp; 2209 NCR5380_transfer_pio(instance, &phase, &len, &data); 2210 cmd->SCp.Message = tmp; 2211 2212 switch (tmp) { 2213 /* 2214 * Linking lets us reduce the time required to get the 2215 * next command out to the device, hopefully this will 2216 * mean we don't waste another revolution due to the delays 2217 * required by ARBITRATION and another SELECTION. 2218 * 2219 * In the current implementation proposal, low level drivers 2220 * merely have to start the next command, pointed to by 2221 * next_link, done() is called as with unlinked commands. 2222 */ 2223 #ifdef LINKED 2224 case LINKED_CMD_COMPLETE: 2225 case LINKED_FLG_CMD_COMPLETE: 2226 /* Accept message by clearing ACK */ 2227 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2228 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2229 /* 2230 * Sanity check : A linked command should only terminate with 2231 * one of these messages if there are more linked commands 2232 * available. 2233 */ 2234 if (!cmd->next_link) { 2235 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2236 sink = 1; 2237 do_abort(instance); 2238 return; 2239 } 2240 initialize_SCp(cmd->next_link); 2241 /* The next command is still part of this process */ 2242 cmd->next_link->tag = cmd->tag; 2243 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2244 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)); 2245 collect_stats(hostdata, cmd); 2246 cmd->scsi_done(cmd); 2247 cmd = hostdata->connected; 2248 break; 2249 #endif /* def LINKED */ 2250 case ABORT: 2251 case COMMAND_COMPLETE: 2252 /* Accept message by clearing ACK */ 2253 sink = 1; 2254 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2255 hostdata->connected = NULL; 2256 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2257 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2258 2259 /* 2260 * I'm not sure what the correct thing to do here is : 2261 * 2262 * If the command that just executed is NOT a request 2263 * sense, the obvious thing to do is to set the result 2264 * code to the values of the stored parameters. 2265 * 2266 * If it was a REQUEST SENSE command, we need some way 2267 * to differentiate between the failure code of the original 2268 * and the failure code of the REQUEST sense - the obvious 2269 * case is success, where we fall through and leave the result 2270 * code unchanged. 2271 * 2272 * The non-obvious place is where the REQUEST SENSE failed 2273 */ 2274 2275 if (cmd->cmnd[0] != REQUEST_SENSE) 2276 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2277 else if (status_byte(cmd->SCp.Status) != GOOD) 2278 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2279 2280 #ifdef AUTOSENSE 2281 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2282 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2283 cmd->cmnd[0] = REQUEST_SENSE; 2284 cmd->cmnd[1] &= 0xe0; 2285 cmd->cmnd[2] = 0; 2286 cmd->cmnd[3] = 0; 2287 cmd->cmnd[4] = sizeof(cmd->sense_buffer); 2288 cmd->cmnd[5] = 0; 2289 2290 cmd->SCp.buffer = NULL; 2291 cmd->SCp.buffers_residual = 0; 2292 cmd->SCp.ptr = (char *) cmd->sense_buffer; 2293 cmd->SCp.this_residual = sizeof(cmd->sense_buffer); 2294 2295 LIST(cmd, hostdata->issue_queue); 2296 cmd->host_scribble = (unsigned char *) 2297 hostdata->issue_queue; 2298 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2299 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2300 } else 2301 #endif /* def AUTOSENSE */ 2302 { 2303 collect_stats(hostdata, cmd); 2304 cmd->scsi_done(cmd); 2305 } 2306 2307 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2308 /* 2309 * Restore phase bits to 0 so an interrupted selection, 2310 * arbitration can resume. 2311 */ 2312 NCR5380_write(TARGET_COMMAND_REG, 0); 2313 2314 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2315 barrier(); 2316 return; 2317 case MESSAGE_REJECT: 2318 /* Accept message by clearing ACK */ 2319 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2320 switch (hostdata->last_message) { 2321 case HEAD_OF_QUEUE_TAG: 2322 case ORDERED_QUEUE_TAG: 2323 case SIMPLE_QUEUE_TAG: 2324 cmd->device->simple_tags = 0; 2325 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2326 break; 2327 default: 2328 break; 2329 } 2330 case DISCONNECT:{ 2331 /* Accept message by clearing ACK */ 2332 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2333 cmd->device->disconnect = 1; 2334 LIST(cmd, hostdata->disconnected_queue); 2335 cmd->host_scribble = (unsigned char *) 2336 hostdata->disconnected_queue; 2337 hostdata->connected = NULL; 2338 hostdata->disconnected_queue = cmd; 2339 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)); 2340 /* 2341 * Restore phase bits to 0 so an interrupted selection, 2342 * arbitration can resume. 2343 */ 2344 NCR5380_write(TARGET_COMMAND_REG, 0); 2345 2346 /* Enable reselect interrupts */ 2347 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2348 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2349 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2350 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2351 barrier(); 2352 return; 2353 } 2354 /* 2355 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2356 * operation, in violation of the SCSI spec so we can safely 2357 * ignore SAVE/RESTORE pointers calls. 2358 * 2359 * Unfortunately, some disks violate the SCSI spec and 2360 * don't issue the required SAVE_POINTERS message before 2361 * disconnecting, and we have to break spec to remain 2362 * compatible. 2363 */ 2364 case SAVE_POINTERS: 2365 case RESTORE_POINTERS: 2366 /* Accept message by clearing ACK */ 2367 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2368 break; 2369 case EXTENDED_MESSAGE: 2370 /* 2371 * Extended messages are sent in the following format : 2372 * Byte 2373 * 0 EXTENDED_MESSAGE == 1 2374 * 1 length (includes one byte for code, doesn't 2375 * include first two bytes) 2376 * 2 code 2377 * 3..length+1 arguments 2378 * 2379 * Start the extended message buffer with the EXTENDED_MESSAGE 2380 * byte, since scsi_print_msg() wants the whole thing. 2381 */ 2382 extended_msg[0] = EXTENDED_MESSAGE; 2383 /* Accept first byte by clearing ACK */ 2384 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2385 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2386 2387 len = 2; 2388 data = extended_msg + 1; 2389 phase = PHASE_MSGIN; 2390 NCR5380_transfer_pio(instance, &phase, &len, &data); 2391 2392 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2393 2394 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2395 /* Accept third byte by clearing ACK */ 2396 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2397 len = extended_msg[1] - 1; 2398 data = extended_msg + 3; 2399 phase = PHASE_MSGIN; 2400 2401 NCR5380_transfer_pio(instance, &phase, &len, &data); 2402 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2403 2404 switch (extended_msg[2]) { 2405 case EXTENDED_SDTR: 2406 case EXTENDED_WDTR: 2407 case EXTENDED_MODIFY_DATA_POINTER: 2408 case EXTENDED_EXTENDED_IDENTIFY: 2409 tmp = 0; 2410 } 2411 } else if (len) { 2412 printk("scsi%d: error receiving extended message\n", instance->host_no); 2413 tmp = 0; 2414 } else { 2415 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2416 tmp = 0; 2417 } 2418 /* Fall through to reject message */ 2419 2420 /* 2421 * If we get something weird that we aren't expecting, 2422 * reject it. 2423 */ 2424 default: 2425 if (!tmp) { 2426 printk("scsi%d: rejecting message ", instance->host_no); 2427 scsi_print_msg(extended_msg); 2428 printk("\n"); 2429 } else if (tmp != EXTENDED_MESSAGE) 2430 scmd_printk(KERN_INFO, cmd, 2431 "rejecting unknown message %02x\n",tmp); 2432 else 2433 scmd_printk(KERN_INFO, cmd, 2434 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 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