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 #include <scsi/scsi_transport_spi.h> 91 92 #ifndef NDEBUG 93 #define NDEBUG 0 94 #endif 95 #ifndef NDEBUG_ABORT 96 #define NDEBUG_ABORT 0 97 #endif 98 99 #if (NDEBUG & NDEBUG_LISTS) 100 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } 101 #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); } 102 #else 103 #define LIST(x,y) 104 #define REMOVE(w,x,y,z) 105 #endif 106 107 #ifndef notyet 108 #undef LINKED 109 #undef REAL_DMA 110 #endif 111 112 #ifdef REAL_DMA_POLL 113 #undef READ_OVERRUNS 114 #define READ_OVERRUNS 115 #endif 116 117 #ifdef BOARD_REQUIRES_NO_DELAY 118 #define io_recovery_delay(x) 119 #else 120 #define io_recovery_delay(x) udelay(x) 121 #endif 122 123 /* 124 * Design 125 * 126 * This is a generic 5380 driver. To use it on a different platform, 127 * one simply writes appropriate system specific macros (ie, data 128 * transfer - some PC's will use the I/O bus, 68K's must use 129 * memory mapped) and drops this file in their 'C' wrapper. 130 * 131 * (Note from hch: unfortunately it was not enough for the different 132 * m68k folks and instead of improving this driver they copied it 133 * and hacked it up for their needs. As a consequence they lost 134 * most updates to this driver. Maybe someone will fix all these 135 * drivers to use a common core one day..) 136 * 137 * As far as command queueing, two queues are maintained for 138 * each 5380 in the system - commands that haven't been issued yet, 139 * and commands that are currently executing. This means that an 140 * unlimited number of commands may be queued, letting 141 * more commands propagate from the higher driver levels giving higher 142 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 143 * allowing multiple commands to propagate all the way to a SCSI-II device 144 * while a command is already executing. 145 * 146 * 147 * Issues specific to the NCR5380 : 148 * 149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 150 * piece of hardware that requires you to sit in a loop polling for 151 * the REQ signal as long as you are connected. Some devices are 152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 153 * while doing long seek operations. 154 * 155 * The workaround for this is to keep track of devices that have 156 * disconnected. If the device hasn't disconnected, for commands that 157 * should disconnect, we do something like 158 * 159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } 160 * 161 * Some tweaking of N and M needs to be done. An algorithm based 162 * on "time to data" would give the best results as long as short time 163 * to datas (ie, on the same track) were considered, however these 164 * broken devices are the exception rather than the rule and I'd rather 165 * spend my time optimizing for the normal case. 166 * 167 * Architecture : 168 * 169 * At the heart of the design is a coroutine, NCR5380_main, 170 * which is started from a workqueue for each NCR5380 host in the 171 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by 172 * removing the commands from the issue queue and calling 173 * NCR5380_select() if a nexus is not established. 174 * 175 * Once a nexus is established, the NCR5380_information_transfer() 176 * phase goes through the various phases as instructed by the target. 177 * if the target goes into MSG IN and sends a DISCONNECT message, 178 * the command structure is placed into the per instance disconnected 179 * queue, and NCR5380_main tries to find more work. If the target is 180 * idle for too long, the system will try to sleep. 181 * 182 * If a command has disconnected, eventually an interrupt will trigger, 183 * calling NCR5380_intr() which will in turn call NCR5380_reselect 184 * to reestablish a nexus. This will run main if necessary. 185 * 186 * On command termination, the done function will be called as 187 * appropriate. 188 * 189 * SCSI pointers are maintained in the SCp field of SCSI command 190 * structures, being initialized after the command is connected 191 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 192 * Note that in violation of the standard, an implicit SAVE POINTERS operation 193 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 194 */ 195 196 /* 197 * Using this file : 198 * This file a skeleton Linux SCSI driver for the NCR 5380 series 199 * of chips. To use it, you write an architecture specific functions 200 * and macros and include this file in your driver. 201 * 202 * These macros control options : 203 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 204 * defined. 205 * 206 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 207 * for commands that return with a CHECK CONDITION status. 208 * 209 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential 210 * transceivers. 211 * 212 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or 213 * override-configure an IRQ. 214 * 215 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 216 * bytes at a time. Since interrupts are disabled by default during 217 * these transfers, we might need this to give reasonable interrupt 218 * service time if the transfer size gets too large. 219 * 220 * LINKED - if defined, linked commands are supported. 221 * 222 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. 223 * 224 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 225 * 226 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't 227 * rely on phase mismatch and EOP interrupts to determine end 228 * of phase. 229 * 230 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You 231 * only really want to use this if you're having a problem with 232 * dropped characters during high speed communications, and even 233 * then, you're going to be better off twiddling with transfersize 234 * in the high level code. 235 * 236 * Defaults for these will be provided although the user may want to adjust 237 * these to allocate CPU resources to the SCSI driver or "real" code. 238 * 239 * USLEEP_SLEEP - amount of time, in jiffies, to sleep 240 * 241 * USLEEP_POLL - amount of time, in jiffies, to poll 242 * 243 * These macros MUST be defined : 244 * NCR5380_local_declare() - declare any local variables needed for your 245 * transfer routines. 246 * 247 * NCR5380_setup(instance) - initialize any local variables needed from a given 248 * instance of the host adapter for NCR5380_{read,write,pread,pwrite} 249 * 250 * NCR5380_read(register) - read from the specified register 251 * 252 * NCR5380_write(register, value) - write to the specific register 253 * 254 * NCR5380_implementation_fields - additional fields needed for this 255 * specific implementation of the NCR5380 256 * 257 * Either real DMA *or* pseudo DMA may be implemented 258 * REAL functions : 259 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 260 * Note that the DMA setup functions should return the number of bytes 261 * that they were able to program the controller for. 262 * 263 * Also note that generic i386/PC versions of these macros are 264 * available as NCR5380_i386_dma_write_setup, 265 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 266 * 267 * NCR5380_dma_write_setup(instance, src, count) - initialize 268 * NCR5380_dma_read_setup(instance, dst, count) - initialize 269 * NCR5380_dma_residual(instance); - residual count 270 * 271 * PSEUDO functions : 272 * NCR5380_pwrite(instance, src, count) 273 * NCR5380_pread(instance, dst, count); 274 * 275 * The generic driver is initialized by calling NCR5380_init(instance), 276 * after setting the appropriate host specific fields and ID. If the 277 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 278 * possible) function may be used. 279 */ 280 281 static int do_abort(struct Scsi_Host *host); 282 static void do_reset(struct Scsi_Host *host); 283 284 /* 285 * initialize_SCp - init the scsi pointer field 286 * @cmd: command block to set up 287 * 288 * Set up the internal fields in the SCSI command. 289 */ 290 291 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) 292 { 293 /* 294 * Initialize the Scsi Pointer field so that all of the commands in the 295 * various queues are valid. 296 */ 297 298 if (cmd->use_sg) { 299 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; 300 cmd->SCp.buffers_residual = cmd->use_sg - 1; 301 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 302 cmd->SCp.buffer->offset; 303 cmd->SCp.this_residual = cmd->SCp.buffer->length; 304 } else { 305 cmd->SCp.buffer = NULL; 306 cmd->SCp.buffers_residual = 0; 307 cmd->SCp.ptr = (char *) cmd->request_buffer; 308 cmd->SCp.this_residual = cmd->request_bufflen; 309 } 310 } 311 312 /** 313 * NCR5380_poll_politely - wait for NCR5380 status bits 314 * @instance: controller to poll 315 * @reg: 5380 register to poll 316 * @bit: Bitmask to check 317 * @val: Value required to exit 318 * 319 * Polls the NCR5380 in a reasonably efficient manner waiting for 320 * an event to occur, after a short quick poll we begin giving the 321 * CPU back in non IRQ contexts 322 * 323 * Returns the value of the register or a negative error code. 324 */ 325 326 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) 327 { 328 NCR5380_local_declare(); 329 int n = 500; /* At about 8uS a cycle for the cpu access */ 330 unsigned long end = jiffies + t; 331 int r; 332 333 NCR5380_setup(instance); 334 335 while( n-- > 0) 336 { 337 r = NCR5380_read(reg); 338 if((r & bit) == val) 339 return 0; 340 cpu_relax(); 341 } 342 343 /* t time yet ? */ 344 while(time_before(jiffies, end)) 345 { 346 r = NCR5380_read(reg); 347 if((r & bit) == val) 348 return 0; 349 if(!in_interrupt()) 350 cond_resched(); 351 else 352 cpu_relax(); 353 } 354 return -ETIMEDOUT; 355 } 356 357 static struct { 358 unsigned char value; 359 const char *name; 360 } phases[] __maybe_unused = { 361 {PHASE_DATAOUT, "DATAOUT"}, 362 {PHASE_DATAIN, "DATAIN"}, 363 {PHASE_CMDOUT, "CMDOUT"}, 364 {PHASE_STATIN, "STATIN"}, 365 {PHASE_MSGOUT, "MSGOUT"}, 366 {PHASE_MSGIN, "MSGIN"}, 367 {PHASE_UNKNOWN, "UNKNOWN"} 368 }; 369 370 #if NDEBUG 371 static struct { 372 unsigned char mask; 373 const char *name; 374 } signals[] = { 375 {SR_DBP, "PARITY"}, 376 {SR_RST, "RST"}, 377 {SR_BSY, "BSY"}, 378 {SR_REQ, "REQ"}, 379 {SR_MSG, "MSG"}, 380 {SR_CD, "CD"}, 381 {SR_IO, "IO"}, 382 {SR_SEL, "SEL"}, 383 {0, NULL} 384 }, 385 basrs[] = { 386 {BASR_ATN, "ATN"}, 387 {BASR_ACK, "ACK"}, 388 {0, NULL} 389 }, 390 icrs[] = { 391 {ICR_ASSERT_RST, "ASSERT RST"}, 392 {ICR_ASSERT_ACK, "ASSERT ACK"}, 393 {ICR_ASSERT_BSY, "ASSERT BSY"}, 394 {ICR_ASSERT_SEL, "ASSERT SEL"}, 395 {ICR_ASSERT_ATN, "ASSERT ATN"}, 396 {ICR_ASSERT_DATA, "ASSERT DATA"}, 397 {0, NULL} 398 }, 399 mrs[] = { 400 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 401 {MR_TARGET, "MODE TARGET"}, 402 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 403 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 404 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 405 {MR_DMA_MODE, "MODE DMA"}, 406 {MR_ARBITRATE, "MODE ARBITRATION"}, 407 {0, NULL} 408 }; 409 410 /** 411 * NCR5380_print - print scsi bus signals 412 * @instance: adapter state to dump 413 * 414 * Print the SCSI bus signals for debugging purposes 415 * 416 * Locks: caller holds hostdata lock (not essential) 417 */ 418 419 static void NCR5380_print(struct Scsi_Host *instance) 420 { 421 NCR5380_local_declare(); 422 unsigned char status, data, basr, mr, icr, i; 423 NCR5380_setup(instance); 424 425 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 426 status = NCR5380_read(STATUS_REG); 427 mr = NCR5380_read(MODE_REG); 428 icr = NCR5380_read(INITIATOR_COMMAND_REG); 429 basr = NCR5380_read(BUS_AND_STATUS_REG); 430 431 printk("STATUS_REG: %02x ", status); 432 for (i = 0; signals[i].mask; ++i) 433 if (status & signals[i].mask) 434 printk(",%s", signals[i].name); 435 printk("\nBASR: %02x ", basr); 436 for (i = 0; basrs[i].mask; ++i) 437 if (basr & basrs[i].mask) 438 printk(",%s", basrs[i].name); 439 printk("\nICR: %02x ", icr); 440 for (i = 0; icrs[i].mask; ++i) 441 if (icr & icrs[i].mask) 442 printk(",%s", icrs[i].name); 443 printk("\nMODE: %02x ", mr); 444 for (i = 0; mrs[i].mask; ++i) 445 if (mr & mrs[i].mask) 446 printk(",%s", mrs[i].name); 447 printk("\n"); 448 } 449 450 451 /* 452 * NCR5380_print_phase - show SCSI phase 453 * @instance: adapter to dump 454 * 455 * Print the current SCSI phase for debugging purposes 456 * 457 * Locks: none 458 */ 459 460 static void NCR5380_print_phase(struct Scsi_Host *instance) 461 { 462 NCR5380_local_declare(); 463 unsigned char status; 464 int i; 465 NCR5380_setup(instance); 466 467 status = NCR5380_read(STATUS_REG); 468 if (!(status & SR_REQ)) 469 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); 470 else { 471 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); 472 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); 473 } 474 } 475 #endif 476 477 /* 478 * These need tweaking, and would probably work best as per-device 479 * flags initialized differently for disk, tape, cd, etc devices. 480 * People with broken devices are free to experiment as to what gives 481 * the best results for them. 482 * 483 * USLEEP_SLEEP should be a minimum seek time. 484 * 485 * USLEEP_POLL should be a maximum rotational latency. 486 */ 487 #ifndef USLEEP_SLEEP 488 /* 20 ms (reasonable hard disk speed) */ 489 #define USLEEP_SLEEP (20*HZ/1000) 490 #endif 491 /* 300 RPM (floppy speed) */ 492 #ifndef USLEEP_POLL 493 #define USLEEP_POLL (200*HZ/1000) 494 #endif 495 #ifndef USLEEP_WAITLONG 496 /* RvC: (reasonable time to wait on select error) */ 497 #define USLEEP_WAITLONG USLEEP_SLEEP 498 #endif 499 500 /* 501 * Function : int should_disconnect (unsigned char cmd) 502 * 503 * Purpose : decide whether a command would normally disconnect or 504 * not, since if it won't disconnect we should go to sleep. 505 * 506 * Input : cmd - opcode of SCSI command 507 * 508 * Returns : DISCONNECT_LONG if we should disconnect for a really long 509 * time (ie always, sleep, look for REQ active, sleep), 510 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal 511 * time-to-data delay, DISCONNECT_NONE if this command would return 512 * immediately. 513 * 514 * Future sleep algorithms based on time to data can exploit 515 * something like this so they can differentiate between "normal" 516 * (ie, read, write, seek) and unusual commands (ie, * format). 517 * 518 * Note : We don't deal with commands that handle an immediate disconnect, 519 * 520 */ 521 522 static int should_disconnect(unsigned char cmd) 523 { 524 switch (cmd) { 525 case READ_6: 526 case WRITE_6: 527 case SEEK_6: 528 case READ_10: 529 case WRITE_10: 530 case SEEK_10: 531 return DISCONNECT_TIME_TO_DATA; 532 case FORMAT_UNIT: 533 case SEARCH_HIGH: 534 case SEARCH_LOW: 535 case SEARCH_EQUAL: 536 return DISCONNECT_LONG; 537 default: 538 return DISCONNECT_NONE; 539 } 540 } 541 542 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) 543 { 544 hostdata->time_expires = jiffies + timeout; 545 schedule_delayed_work(&hostdata->coroutine, timeout); 546 } 547 548 549 static int probe_irq __initdata = 0; 550 551 /** 552 * probe_intr - helper for IRQ autoprobe 553 * @irq: interrupt number 554 * @dev_id: unused 555 * @regs: unused 556 * 557 * Set a flag to indicate the IRQ in question was received. This is 558 * used by the IRQ probe code. 559 */ 560 561 static irqreturn_t __init probe_intr(int irq, void *dev_id) 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 __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, 579 int possible) 580 { 581 NCR5380_local_declare(); 582 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 583 unsigned long timeout; 584 int trying_irqs, i, mask; 585 NCR5380_setup(instance); 586 587 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) 588 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0)) 589 trying_irqs |= mask; 590 591 timeout = jiffies + (250 * HZ / 1000); 592 probe_irq = SCSI_IRQ_NONE; 593 594 /* 595 * A interrupt is triggered whenever BSY = false, SEL = true 596 * and a bit set in the SELECT_ENABLE_REG is asserted on the 597 * SCSI bus. 598 * 599 * Note that the bus is only driven when the phase control signals 600 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 601 * to zero. 602 */ 603 604 NCR5380_write(TARGET_COMMAND_REG, 0); 605 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 606 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 607 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 608 609 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) 610 schedule_timeout_uninterruptible(1); 611 612 NCR5380_write(SELECT_ENABLE_REG, 0); 613 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 614 615 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 616 if (trying_irqs & mask) 617 free_irq(i, NULL); 618 619 return probe_irq; 620 } 621 622 /** 623 * NCR58380_print_options - show options 624 * @instance: unused for now 625 * 626 * Called by probe code indicating the NCR5380 driver options that 627 * were selected. At some point this will switch to runtime options 628 * read from the adapter in question 629 * 630 * Locks: none 631 */ 632 633 static void __init __maybe_unused 634 NCR5380_print_options(struct Scsi_Host *instance) 635 { 636 printk(" generic options" 637 #ifdef AUTOPROBE_IRQ 638 " AUTOPROBE_IRQ" 639 #endif 640 #ifdef AUTOSENSE 641 " AUTOSENSE" 642 #endif 643 #ifdef DIFFERENTIAL 644 " DIFFERENTIAL" 645 #endif 646 #ifdef REAL_DMA 647 " REAL DMA" 648 #endif 649 #ifdef REAL_DMA_POLL 650 " REAL DMA POLL" 651 #endif 652 #ifdef PARITY 653 " PARITY" 654 #endif 655 #ifdef PSEUDO_DMA 656 " PSEUDO DMA" 657 #endif 658 #ifdef UNSAFE 659 " UNSAFE " 660 #endif 661 ); 662 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 663 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 664 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 665 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 666 } 667 } 668 669 /** 670 * NCR5380_print_status - dump controller info 671 * @instance: controller to dump 672 * 673 * Print commands in the various queues, called from NCR5380_abort 674 * and NCR5380_debug to aid debugging. 675 * 676 * Locks: called functions disable irqs 677 */ 678 679 static void NCR5380_print_status(struct Scsi_Host *instance) 680 { 681 NCR5380_dprint(NDEBUG_ANY, instance); 682 NCR5380_dprint_phase(NDEBUG_ANY, instance); 683 } 684 685 /******************************************/ 686 /* 687 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 688 * 689 * *buffer: I/O buffer 690 * **start: if inout == FALSE pointer into buffer where user read should start 691 * offset: current offset 692 * length: length of buffer 693 * hostno: Scsi_Host host_no 694 * inout: TRUE - user is writing; FALSE - user is reading 695 * 696 * Return the number of bytes read from or written 697 */ 698 699 #undef SPRINTF 700 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) 701 static 702 char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); 703 static 704 char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); 705 static 706 char *lprint_opcode(int opcode, char *pos, char *buffer, int length); 707 708 static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance, 709 char *buffer, char **start, off_t offset, int length, int inout) 710 { 711 char *pos = buffer; 712 struct NCR5380_hostdata *hostdata; 713 Scsi_Cmnd *ptr; 714 715 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 716 717 if (inout) { /* Has data been written to the file ? */ 718 #ifdef DTC_PUBLIC_RELEASE 719 dtc_wmaxi = dtc_maxi = 0; 720 #endif 721 #ifdef PAS16_PUBLIC_RELEASE 722 pas_wmaxi = pas_maxi = 0; 723 #endif 724 return (-ENOSYS); /* Currently this is a no-op */ 725 } 726 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 727 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 728 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 729 #ifdef DTC_PUBLIC_RELEASE 730 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 731 #endif 732 #ifdef T128_PUBLIC_RELEASE 733 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 734 #endif 735 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 736 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 737 #endif 738 #ifdef PAS16_PUBLIC_RELEASE 739 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 740 #endif 741 742 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 743 SPRINTF("io_port: %04x ", (int) instance->io_port); 744 if (instance->irq == SCSI_IRQ_NONE) 745 SPRINTF("IRQ: None.\n"); 746 else 747 SPRINTF("IRQ: %d.\n", instance->irq); 748 749 #ifdef DTC_PUBLIC_RELEASE 750 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 751 #endif 752 #ifdef PAS16_PUBLIC_RELEASE 753 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 754 #endif 755 spin_lock_irq(instance->host_lock); 756 if (!hostdata->connected) 757 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 758 else 759 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); 760 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 761 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 762 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 763 764 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 765 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 766 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 767 spin_unlock_irq(instance->host_lock); 768 769 *start = buffer; 770 if (pos - buffer < offset) 771 return 0; 772 else if (pos - buffer - offset < length) 773 return pos - buffer - offset; 774 return length; 775 } 776 777 static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) 778 { 779 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 780 SPRINTF(" command = "); 781 pos = lprint_command(cmd->cmnd, pos, buffer, length); 782 return (pos); 783 } 784 785 static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) 786 { 787 int i, s; 788 pos = lprint_opcode(command[0], pos, buffer, length); 789 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 790 SPRINTF("%02x ", command[i]); 791 SPRINTF("\n"); 792 return (pos); 793 } 794 795 static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) 796 { 797 SPRINTF("%2d (0x%02x)", opcode, opcode); 798 return (pos); 799 } 800 801 802 /** 803 * NCR5380_init - initialise an NCR5380 804 * @instance: adapter to configure 805 * @flags: control flags 806 * 807 * Initializes *instance and corresponding 5380 chip, 808 * with flags OR'd into the initial flags value. 809 * 810 * Notes : I assume that the host, hostno, and id bits have been 811 * set correctly. I don't care about the irq and other fields. 812 * 813 * Returns 0 for success 814 * 815 * Locks: interrupts must be enabled when we are called 816 */ 817 818 static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) 819 { 820 NCR5380_local_declare(); 821 int i, pass; 822 unsigned long timeout; 823 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 824 825 if(in_interrupt()) 826 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 827 /* 828 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 829 * the base address. 830 */ 831 832 #ifdef NCR53C400 833 if (flags & FLAG_NCR53C400) 834 instance->NCR5380_instance_name += NCR53C400_address_adjust; 835 #endif 836 837 NCR5380_setup(instance); 838 839 hostdata->aborted = 0; 840 hostdata->id_mask = 1 << instance->this_id; 841 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 842 if (i > hostdata->id_mask) 843 hostdata->id_higher_mask |= i; 844 for (i = 0; i < 8; ++i) 845 hostdata->busy[i] = 0; 846 #ifdef REAL_DMA 847 hostdata->dmalen = 0; 848 #endif 849 hostdata->targets_present = 0; 850 hostdata->connected = NULL; 851 hostdata->issue_queue = NULL; 852 hostdata->disconnected_queue = NULL; 853 854 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); 855 856 #ifdef NCR5380_STATS 857 for (i = 0; i < 8; ++i) { 858 hostdata->time_read[i] = 0; 859 hostdata->time_write[i] = 0; 860 hostdata->bytes_read[i] = 0; 861 hostdata->bytes_write[i] = 0; 862 } 863 hostdata->timebase = 0; 864 hostdata->pendingw = 0; 865 hostdata->pendingr = 0; 866 #endif 867 868 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 869 if (flags & FLAG_NCR53C400) 870 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 871 else 872 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 873 874 hostdata->host = instance; 875 hostdata->time_expires = 0; 876 877 #ifndef AUTOSENSE 878 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 879 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 880 " be incorrectly cleared.\n", instance->host_no); 881 #endif /* def AUTOSENSE */ 882 883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 884 NCR5380_write(MODE_REG, MR_BASE); 885 NCR5380_write(TARGET_COMMAND_REG, 0); 886 NCR5380_write(SELECT_ENABLE_REG, 0); 887 888 #ifdef NCR53C400 889 if (hostdata->flags & FLAG_NCR53C400) { 890 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 891 } 892 #endif 893 894 /* 895 * Detect and correct bus wedge problems. 896 * 897 * If the system crashed, it may have crashed in a state 898 * where a SCSI command was still executing, and the 899 * SCSI bus is not in a BUS FREE STATE. 900 * 901 * If this is the case, we'll try to abort the currently 902 * established nexus which we know nothing about, and that 903 * failing, do a hard reset of the SCSI bus 904 */ 905 906 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 907 switch (pass) { 908 case 1: 909 case 3: 910 case 5: 911 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 912 timeout = jiffies + 5 * HZ; 913 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 914 break; 915 case 2: 916 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 917 do_abort(instance); 918 break; 919 case 4: 920 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 921 do_reset(instance); 922 break; 923 case 6: 924 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 925 return -ENXIO; 926 } 927 } 928 return 0; 929 } 930 931 /** 932 * NCR5380_exit - remove an NCR5380 933 * @instance: adapter to remove 934 */ 935 936 static void __devexit NCR5380_exit(struct Scsi_Host *instance) 937 { 938 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 939 940 cancel_delayed_work(&hostdata->coroutine); 941 flush_scheduled_work(); 942 } 943 944 /** 945 * NCR5380_queue_command - queue a command 946 * @cmd: SCSI command 947 * @done: completion handler 948 * 949 * cmd is added to the per instance issue_queue, with minor 950 * twiddling done to the host specific fields of cmd. If the 951 * main coroutine is not running, it is restarted. 952 * 953 * Locks: host lock taken by caller 954 */ 955 956 static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 957 { 958 struct Scsi_Host *instance = cmd->device->host; 959 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 960 Scsi_Cmnd *tmp; 961 962 #if (NDEBUG & NDEBUG_NO_WRITE) 963 switch (cmd->cmnd[0]) { 964 case WRITE_6: 965 case WRITE_10: 966 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 967 cmd->result = (DID_ERROR << 16); 968 done(cmd); 969 return 0; 970 } 971 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 972 973 #ifdef NCR5380_STATS 974 switch (cmd->cmnd[0]) { 975 case WRITE: 976 case WRITE_6: 977 case WRITE_10: 978 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 979 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; 980 hostdata->pendingw++; 981 break; 982 case READ: 983 case READ_6: 984 case READ_10: 985 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 986 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; 987 hostdata->pendingr++; 988 break; 989 } 990 #endif 991 992 /* 993 * We use the host_scribble field as a pointer to the next command 994 * in a queue 995 */ 996 997 cmd->host_scribble = NULL; 998 cmd->scsi_done = done; 999 cmd->result = 0; 1000 1001 /* 1002 * Insert the cmd into the issue queue. Note that REQUEST SENSE 1003 * commands are added to the head of the queue since any command will 1004 * clear the contingent allegiance condition that exists and the 1005 * sense data is only guaranteed to be valid while the condition exists. 1006 */ 1007 1008 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1009 LIST(cmd, hostdata->issue_queue); 1010 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 1011 hostdata->issue_queue = cmd; 1012 } else { 1013 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 1014 LIST(cmd, tmp); 1015 tmp->host_scribble = (unsigned char *) cmd; 1016 } 1017 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); 1018 1019 /* Run the coroutine if it isn't already running. */ 1020 /* Kick off command processing */ 1021 schedule_delayed_work(&hostdata->coroutine, 0); 1022 return 0; 1023 } 1024 1025 1026 /** 1027 * NCR5380_main - NCR state machines 1028 * 1029 * NCR5380_main is a coroutine that runs as long as more work can 1030 * be done on the NCR5380 host adapters in a system. Both 1031 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1032 * in case it is not running. 1033 * 1034 * Locks: called as its own thread with no locks held. Takes the 1035 * host lock and called routines may take the isa dma lock. 1036 */ 1037 1038 static void NCR5380_main(struct work_struct *work) 1039 { 1040 struct NCR5380_hostdata *hostdata = 1041 container_of(work, struct NCR5380_hostdata, coroutine.work); 1042 struct Scsi_Host *instance = hostdata->host; 1043 Scsi_Cmnd *tmp, *prev; 1044 int done; 1045 1046 spin_lock_irq(instance->host_lock); 1047 do { 1048 /* Lock held here */ 1049 done = 1; 1050 if (!hostdata->connected && !hostdata->selecting) { 1051 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); 1052 /* 1053 * Search through the issue_queue for a command destined 1054 * for a target that's not busy. 1055 */ 1056 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1057 { 1058 if (prev != tmp) 1059 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); 1060 /* When we find one, remove it from the issue queue. */ 1061 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1062 if (prev) { 1063 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1064 prev->host_scribble = tmp->host_scribble; 1065 } else { 1066 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1067 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1068 } 1069 tmp->host_scribble = NULL; 1070 1071 /* 1072 * Attempt to establish an I_T_L nexus here. 1073 * On success, instance->hostdata->connected is set. 1074 * On failure, we must add the command back to the 1075 * issue queue so we can keep trying. 1076 */ 1077 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); 1078 1079 /* 1080 * A successful selection is defined as one that 1081 * leaves us with the command connected and 1082 * in hostdata->connected, OR has terminated the 1083 * command. 1084 * 1085 * With successful commands, we fall through 1086 * and see if we can do an information transfer, 1087 * with failures we will restart. 1088 */ 1089 hostdata->selecting = NULL; 1090 /* RvC: have to preset this to indicate a new command is being performed */ 1091 1092 if (!NCR5380_select(instance, tmp, 1093 /* 1094 * REQUEST SENSE commands are issued without tagged 1095 * queueing, even on SCSI-II devices because the 1096 * contingent allegiance condition exists for the 1097 * entire unit. 1098 */ 1099 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1100 break; 1101 } else { 1102 LIST(tmp, hostdata->issue_queue); 1103 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1104 hostdata->issue_queue = tmp; 1105 done = 0; 1106 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); 1107 } 1108 /* lock held here still */ 1109 } /* if target/lun is not busy */ 1110 } /* for */ 1111 /* exited locked */ 1112 } /* if (!hostdata->connected) */ 1113 if (hostdata->selecting) { 1114 tmp = (Scsi_Cmnd *) hostdata->selecting; 1115 /* Selection will drop and retake the lock */ 1116 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1117 /* Ok ?? */ 1118 } else { 1119 /* RvC: device failed, so we wait a long time 1120 this is needed for Mustek scanners, that 1121 do not respond to commands immediately 1122 after a scan */ 1123 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1124 LIST(tmp, hostdata->issue_queue); 1125 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1126 hostdata->issue_queue = tmp; 1127 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1128 } 1129 } /* if hostdata->selecting */ 1130 if (hostdata->connected 1131 #ifdef REAL_DMA 1132 && !hostdata->dmalen 1133 #endif 1134 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1135 ) { 1136 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); 1137 NCR5380_information_transfer(instance); 1138 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); 1139 done = 0; 1140 } else 1141 break; 1142 } while (!done); 1143 1144 spin_unlock_irq(instance->host_lock); 1145 } 1146 1147 #ifndef DONT_USE_INTR 1148 1149 /** 1150 * NCR5380_intr - generic NCR5380 irq handler 1151 * @irq: interrupt number 1152 * @dev_id: device info 1153 * 1154 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1155 * from the disconnected queue, and restarting NCR5380_main() 1156 * as required. 1157 * 1158 * Locks: takes the needed instance locks 1159 */ 1160 1161 static irqreturn_t NCR5380_intr(int irq, void *dev_id) 1162 { 1163 NCR5380_local_declare(); 1164 struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; 1165 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1166 int done; 1167 unsigned char basr; 1168 unsigned long flags; 1169 1170 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq)); 1171 1172 do { 1173 done = 1; 1174 spin_lock_irqsave(instance->host_lock, flags); 1175 /* Look for pending interrupts */ 1176 NCR5380_setup(instance); 1177 basr = NCR5380_read(BUS_AND_STATUS_REG); 1178 /* XXX dispatch to appropriate routine if found and done=0 */ 1179 if (basr & BASR_IRQ) { 1180 NCR5380_dprint(NDEBUG_INTR, instance); 1181 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1182 done = 0; 1183 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); 1184 NCR5380_reselect(instance); 1185 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1186 } else if (basr & BASR_PARITY_ERROR) { 1187 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); 1188 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1189 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1190 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); 1191 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1192 } else { 1193 #if defined(REAL_DMA) 1194 /* 1195 * We should only get PHASE MISMATCH and EOP interrupts 1196 * if we have DMA enabled, so do a sanity check based on 1197 * the current setting of the MODE register. 1198 */ 1199 1200 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1201 int transfered; 1202 1203 if (!hostdata->connected) 1204 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1205 1206 transfered = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1207 hostdata->connected->SCp.this_residual -= transferred; 1208 hostdata->connected->SCp.ptr += transferred; 1209 hostdata->dmalen = 0; 1210 1211 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1212 1213 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1214 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1215 1216 NCR5380_write(MODE_REG, MR_BASE); 1217 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1218 } 1219 #else 1220 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))); 1221 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1222 #endif 1223 } 1224 } /* if BASR_IRQ */ 1225 spin_unlock_irqrestore(instance->host_lock, flags); 1226 if(!done) 1227 schedule_delayed_work(&hostdata->coroutine, 0); 1228 } while (!done); 1229 return IRQ_HANDLED; 1230 } 1231 1232 #endif 1233 1234 /** 1235 * collect_stats - collect stats on a scsi command 1236 * @hostdata: adapter 1237 * @cmd: command being issued 1238 * 1239 * Update the statistical data by parsing the command in question 1240 */ 1241 1242 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1243 { 1244 #ifdef NCR5380_STATS 1245 switch (cmd->cmnd[0]) { 1246 case WRITE: 1247 case WRITE_6: 1248 case WRITE_10: 1249 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1250 hostdata->pendingw--; 1251 break; 1252 case READ: 1253 case READ_6: 1254 case READ_10: 1255 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1256 hostdata->pendingr--; 1257 break; 1258 } 1259 #endif 1260 } 1261 1262 1263 /* 1264 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1265 * int tag); 1266 * 1267 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1268 * including ARBITRATION, SELECTION, and initial message out for 1269 * IDENTIFY and queue messages. 1270 * 1271 * Inputs : instance - instantiation of the 5380 driver on which this 1272 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1273 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1274 * the command that is presently connected. 1275 * 1276 * Returns : -1 if selection could not execute for some reason, 1277 * 0 if selection succeeded or failed because the target 1278 * did not respond. 1279 * 1280 * Side effects : 1281 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1282 * with registers as they should have been on entry - ie 1283 * SELECT_ENABLE will be set appropriately, the NCR5380 1284 * will cease to drive any SCSI bus signals. 1285 * 1286 * If successful : I_T_L or I_T_L_Q nexus will be established, 1287 * instance->connected will be set to cmd. 1288 * SELECT interrupt will be disabled. 1289 * 1290 * If failed (no target) : cmd->scsi_done() will be called, and the 1291 * cmd->result host byte set to DID_BAD_TARGET. 1292 * 1293 * Locks: caller holds hostdata lock in IRQ mode 1294 */ 1295 1296 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1297 { 1298 NCR5380_local_declare(); 1299 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1300 unsigned char tmp[3], phase; 1301 unsigned char *data; 1302 int len; 1303 unsigned long timeout; 1304 unsigned char value; 1305 int err; 1306 NCR5380_setup(instance); 1307 1308 if (hostdata->selecting) 1309 goto part2; 1310 1311 hostdata->restart_select = 0; 1312 1313 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1314 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); 1315 1316 /* 1317 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1318 * data bus during SELECTION. 1319 */ 1320 1321 NCR5380_write(TARGET_COMMAND_REG, 0); 1322 1323 /* 1324 * Start arbitration. 1325 */ 1326 1327 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1328 NCR5380_write(MODE_REG, MR_ARBITRATE); 1329 1330 1331 /* We can be relaxed here, interrupts are on, we are 1332 in workqueue context, the birds are singing in the trees */ 1333 spin_unlock_irq(instance->host_lock); 1334 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1335 spin_lock_irq(instance->host_lock); 1336 if (err < 0) { 1337 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1338 NCR5380_write(MODE_REG, MR_BASE); 1339 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1340 goto failed; 1341 } 1342 1343 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); 1344 1345 /* 1346 * The arbitration delay is 2.2us, but this is a minimum and there is 1347 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1348 * the integral nature of udelay(). 1349 * 1350 */ 1351 1352 udelay(3); 1353 1354 /* Check for lost arbitration */ 1355 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)) { 1356 NCR5380_write(MODE_REG, MR_BASE); 1357 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); 1358 goto failed; 1359 } 1360 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1361 1362 if (!(hostdata->flags & FLAG_DTC3181E) && 1363 /* RvC: DTC3181E has some trouble with this 1364 * so we simply removed it. Seems to work with 1365 * only Mustek scanner attached 1366 */ 1367 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1368 NCR5380_write(MODE_REG, MR_BASE); 1369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1370 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); 1371 goto failed; 1372 } 1373 /* 1374 * Again, bus clear + bus settle time is 1.2us, however, this is 1375 * a minimum so we'll udelay ceil(1.2) 1376 */ 1377 1378 udelay(2); 1379 1380 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); 1381 1382 /* 1383 * Now that we have won arbitration, start Selection process, asserting 1384 * the host and target ID's on the SCSI bus. 1385 */ 1386 1387 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); 1388 1389 /* 1390 * Raise ATN while SEL is true before BSY goes false from arbitration, 1391 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1392 * phase immediately after selection. 1393 */ 1394 1395 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1396 NCR5380_write(MODE_REG, MR_BASE); 1397 1398 /* 1399 * Reselect interrupts must be turned off prior to the dropping of BSY, 1400 * otherwise we will trigger an interrupt. 1401 */ 1402 NCR5380_write(SELECT_ENABLE_REG, 0); 1403 1404 /* 1405 * The initiator shall then wait at least two deskew delays and release 1406 * the BSY signal. 1407 */ 1408 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1409 1410 /* Reset BSY */ 1411 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1412 1413 /* 1414 * Something weird happens when we cease to drive BSY - looks 1415 * like the board/chip is letting us do another read before the 1416 * appropriate propagation delay has expired, and we're confusing 1417 * a BSY signal from ourselves as the target's response to SELECTION. 1418 * 1419 * A small delay (the 'C++' frontend breaks the pipeline with an 1420 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1421 * tighter 'C' code breaks and requires this) solves the problem - 1422 * the 1 us delay is arbitrary, and only used because this delay will 1423 * be the same on other platforms and since it works here, it should 1424 * work there. 1425 * 1426 * wingel suggests that this could be due to failing to wait 1427 * one deskew delay. 1428 */ 1429 1430 udelay(1); 1431 1432 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); 1433 1434 /* 1435 * The SCSI specification calls for a 250 ms timeout for the actual 1436 * selection. 1437 */ 1438 1439 timeout = jiffies + (250 * HZ / 1000); 1440 1441 /* 1442 * XXX very interesting - we're seeing a bounce where the BSY we 1443 * asserted is being reflected / still asserted (propagation delay?) 1444 * and it's detecting as true. Sigh. 1445 */ 1446 1447 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1448 hostdata->selecting = cmd; 1449 1450 part2: 1451 /* RvC: here we enter after a sleeping period, or immediately after 1452 execution of part 1 1453 we poll only once ech clock tick */ 1454 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1455 1456 if (!value && (hostdata->select_time < HZ/4)) { 1457 /* RvC: we still must wait for a device response */ 1458 hostdata->select_time++; /* after 25 ticks the device has failed */ 1459 NCR5380_set_timer(hostdata, 1); 1460 return 0; /* RvC: we return here with hostdata->selecting set, 1461 to go to sleep */ 1462 } 1463 1464 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1465 waiting period */ 1466 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1467 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1468 NCR5380_reselect(instance); 1469 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1470 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1471 return -1; 1472 } 1473 /* 1474 * No less than two deskew delays after the initiator detects the 1475 * BSY signal is true, it shall release the SEL signal and may 1476 * change the DATA BUS. -wingel 1477 */ 1478 1479 udelay(1); 1480 1481 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1482 1483 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1484 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1485 if (hostdata->targets_present & (1 << scmd_id(cmd))) { 1486 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1487 if (hostdata->restart_select) 1488 printk(KERN_DEBUG "\trestart select\n"); 1489 NCR5380_dprint(NDEBUG_SELECTION, instance); 1490 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1491 return -1; 1492 } 1493 cmd->result = DID_BAD_TARGET << 16; 1494 collect_stats(hostdata, cmd); 1495 cmd->scsi_done(cmd); 1496 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1497 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); 1498 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1499 return 0; 1500 } 1501 hostdata->targets_present |= (1 << scmd_id(cmd)); 1502 1503 /* 1504 * Since we followed the SCSI spec, and raised ATN while SEL 1505 * was true but before BSY was false during selection, the information 1506 * transfer phase should be a MESSAGE OUT phase so that we can send the 1507 * IDENTIFY message. 1508 * 1509 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1510 * message (2 bytes) with a tag ID that we increment with every command 1511 * until it wraps back to 0. 1512 * 1513 * XXX - it turns out that there are some broken SCSI-II devices, 1514 * which claim to support tagged queuing but fail when more than 1515 * some number of commands are issued at once. 1516 */ 1517 1518 /* Wait for start of REQ/ACK handshake */ 1519 1520 spin_unlock_irq(instance->host_lock); 1521 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1522 spin_lock_irq(instance->host_lock); 1523 1524 if(err) { 1525 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1526 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1527 goto failed; 1528 } 1529 1530 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); 1531 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1532 1533 len = 1; 1534 cmd->tag = 0; 1535 1536 /* Send message(s) */ 1537 data = tmp; 1538 phase = PHASE_MSGOUT; 1539 NCR5380_transfer_pio(instance, &phase, &len, &data); 1540 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); 1541 /* XXX need to handle errors here */ 1542 hostdata->connected = cmd; 1543 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1544 1545 if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { 1546 initialize_SCp(cmd); 1547 } 1548 1549 return 0; 1550 1551 /* Selection failed */ 1552 failed: 1553 return -1; 1554 1555 } 1556 1557 /* 1558 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1559 * unsigned char *phase, int *count, unsigned char **data) 1560 * 1561 * Purpose : transfers data in given phase using polled I/O 1562 * 1563 * Inputs : instance - instance of driver, *phase - pointer to 1564 * what phase is expected, *count - pointer to number of 1565 * bytes to transfer, **data - pointer to data pointer. 1566 * 1567 * Returns : -1 when different phase is entered without transferring 1568 * maximum number of bytes, 0 if all bytes or transfered or exit 1569 * is in same phase. 1570 * 1571 * Also, *phase, *count, *data are modified in place. 1572 * 1573 * XXX Note : handling for bus free may be useful. 1574 */ 1575 1576 /* 1577 * Note : this code is not as quick as it could be, however it 1578 * IS 100% reliable, and for the actual data transfer where speed 1579 * counts, we will always do a pseudo DMA or DMA transfer. 1580 */ 1581 1582 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1583 NCR5380_local_declare(); 1584 unsigned char p = *phase, tmp; 1585 int c = *count; 1586 unsigned char *d = *data; 1587 /* 1588 * RvC: some administrative data to process polling time 1589 */ 1590 int break_allowed = 0; 1591 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1592 NCR5380_setup(instance); 1593 1594 if (!(p & SR_IO)) 1595 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); 1596 else 1597 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); 1598 1599 /* 1600 * The NCR5380 chip will only drive the SCSI bus when the 1601 * phase specified in the appropriate bits of the TARGET COMMAND 1602 * REGISTER match the STATUS REGISTER 1603 */ 1604 1605 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1606 1607 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1608 * so breaks are not necessary there 1609 */ 1610 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1611 break_allowed = 1; 1612 } 1613 do { 1614 /* 1615 * Wait for assertion of REQ, after which the phase bits will be 1616 * valid 1617 */ 1618 1619 /* RvC: we simply poll once, after that we stop temporarily 1620 * and let the device buffer fill up 1621 * if breaking is not allowed, we keep polling as long as needed 1622 */ 1623 1624 /* FIXME */ 1625 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1626 if (!(tmp & SR_REQ)) { 1627 /* timeout condition */ 1628 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1629 break; 1630 } 1631 1632 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); 1633 1634 /* Check for phase mismatch */ 1635 if ((tmp & PHASE_MASK) != p) { 1636 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); 1637 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1638 break; 1639 } 1640 /* Do actual transfer from SCSI bus to / from memory */ 1641 if (!(p & SR_IO)) 1642 NCR5380_write(OUTPUT_DATA_REG, *d); 1643 else 1644 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1645 1646 ++d; 1647 1648 /* 1649 * The SCSI standard suggests that in MSGOUT phase, the initiator 1650 * should drop ATN on the last byte of the message phase 1651 * after REQ has been asserted for the handshake but before 1652 * the initiator raises ACK. 1653 */ 1654 1655 if (!(p & SR_IO)) { 1656 if (!((p & SR_MSG) && c > 1)) { 1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1658 NCR5380_dprint(NDEBUG_PIO, instance); 1659 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1660 } else { 1661 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1662 NCR5380_dprint(NDEBUG_PIO, instance); 1663 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1664 } 1665 } else { 1666 NCR5380_dprint(NDEBUG_PIO, instance); 1667 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1668 } 1669 1670 /* FIXME - if this fails bus reset ?? */ 1671 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1672 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); 1673 1674 /* 1675 * We have several special cases to consider during REQ/ACK handshaking : 1676 * 1. We were in MSGOUT phase, and we are on the last byte of the 1677 * message. ATN must be dropped as ACK is dropped. 1678 * 1679 * 2. We are in a MSGIN phase, and we are on the last byte of the 1680 * message. We must exit with ACK asserted, so that the calling 1681 * code may raise ATN before dropping ACK to reject the message. 1682 * 1683 * 3. ACK and ATN are clear and the target may proceed as normal. 1684 */ 1685 if (!(p == PHASE_MSGIN && c == 1)) { 1686 if (p == PHASE_MSGOUT && c > 1) 1687 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1688 else 1689 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1690 } 1691 } while (--c); 1692 1693 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); 1694 1695 *count = c; 1696 *data = d; 1697 tmp = NCR5380_read(STATUS_REG); 1698 if (tmp & SR_REQ) 1699 *phase = tmp & PHASE_MASK; 1700 else 1701 *phase = PHASE_UNKNOWN; 1702 1703 if (!c || (*phase == p)) 1704 return 0; 1705 else 1706 return -1; 1707 } 1708 1709 /** 1710 * do_reset - issue a reset command 1711 * @host: adapter to reset 1712 * 1713 * Issue a reset sequence to the NCR5380 and try and get the bus 1714 * back into sane shape. 1715 * 1716 * Locks: caller holds queue lock 1717 */ 1718 1719 static void do_reset(struct Scsi_Host *host) { 1720 NCR5380_local_declare(); 1721 NCR5380_setup(host); 1722 1723 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1724 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1725 udelay(25); 1726 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1727 } 1728 1729 /* 1730 * Function : do_abort (Scsi_Host *host) 1731 * 1732 * Purpose : abort the currently established nexus. Should only be 1733 * called from a routine which can drop into a 1734 * 1735 * Returns : 0 on success, -1 on failure. 1736 * 1737 * Locks: queue lock held by caller 1738 * FIXME: sort this out and get new_eh running 1739 */ 1740 1741 static int do_abort(struct Scsi_Host *host) { 1742 NCR5380_local_declare(); 1743 unsigned char *msgptr, phase, tmp; 1744 int len; 1745 int rc; 1746 NCR5380_setup(host); 1747 1748 1749 /* Request message out phase */ 1750 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1751 1752 /* 1753 * Wait for the target to indicate a valid phase by asserting 1754 * REQ. Once this happens, we'll have either a MSGOUT phase 1755 * and can immediately send the ABORT message, or we'll have some 1756 * other phase and will have to source/sink data. 1757 * 1758 * We really don't care what value was on the bus or what value 1759 * the target sees, so we just handshake. 1760 */ 1761 1762 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1763 1764 if(rc < 0) 1765 return -1; 1766 1767 tmp = (unsigned char)rc; 1768 1769 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1770 1771 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1772 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1773 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1774 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1775 if(rc == -1) 1776 return -1; 1777 } 1778 tmp = ABORT; 1779 msgptr = &tmp; 1780 len = 1; 1781 phase = PHASE_MSGOUT; 1782 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1783 1784 /* 1785 * If we got here, and the command completed successfully, 1786 * we're about to go into bus free state. 1787 */ 1788 1789 return len ? -1 : 0; 1790 } 1791 1792 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1793 /* 1794 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1795 * unsigned char *phase, int *count, unsigned char **data) 1796 * 1797 * Purpose : transfers data in given phase using either real 1798 * or pseudo DMA. 1799 * 1800 * Inputs : instance - instance of driver, *phase - pointer to 1801 * what phase is expected, *count - pointer to number of 1802 * bytes to transfer, **data - pointer to data pointer. 1803 * 1804 * Returns : -1 when different phase is entered without transferring 1805 * maximum number of bytes, 0 if all bytes or transfered or exit 1806 * is in same phase. 1807 * 1808 * Also, *phase, *count, *data are modified in place. 1809 * 1810 * Locks: io_request lock held by caller 1811 */ 1812 1813 1814 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1815 NCR5380_local_declare(); 1816 register int c = *count; 1817 register unsigned char p = *phase; 1818 register unsigned char *d = *data; 1819 unsigned char tmp; 1820 int foo; 1821 #if defined(REAL_DMA_POLL) 1822 int cnt, toPIO; 1823 unsigned char saved_data = 0, overrun = 0, residue; 1824 #endif 1825 1826 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1827 1828 NCR5380_setup(instance); 1829 1830 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1831 *phase = tmp; 1832 return -1; 1833 } 1834 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1835 #ifdef READ_OVERRUNS 1836 if (p & SR_IO) { 1837 c -= 2; 1838 } 1839 #endif 1840 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)); 1841 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1842 #endif 1843 1844 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1845 1846 #ifdef REAL_DMA 1847 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1848 #elif defined(REAL_DMA_POLL) 1849 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1850 #else 1851 /* 1852 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1853 * were not disabled for the duration of a single DMA transfer, from 1854 * before the setting of DMA mode to after transfer of the last byte. 1855 */ 1856 1857 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1858 spin_unlock_irq(instance->host_lock); 1859 #endif 1860 /* KLL May need eop and parity in 53c400 */ 1861 if (hostdata->flags & FLAG_NCR53C400) 1862 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); 1863 else 1864 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1865 #endif /* def REAL_DMA */ 1866 1867 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1868 1869 /* 1870 * On the PAS16 at least I/O recovery delays are not needed here. 1871 * Everyone else seems to want them. 1872 */ 1873 1874 if (p & SR_IO) { 1875 io_recovery_delay(1); 1876 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1877 } else { 1878 io_recovery_delay(1); 1879 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1880 io_recovery_delay(1); 1881 NCR5380_write(START_DMA_SEND_REG, 0); 1882 io_recovery_delay(1); 1883 } 1884 1885 #if defined(REAL_DMA_POLL) 1886 do { 1887 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1888 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1889 1890 /* 1891 At this point, either we've completed DMA, or we have a phase mismatch, 1892 or we've unexpectedly lost BUSY (which is a real error). 1893 1894 For write DMAs, we want to wait until the last byte has been 1895 transferred out over the bus before we turn off DMA mode. Alas, there 1896 seems to be no terribly good way of doing this on a 5380 under all 1897 conditions. For non-scatter-gather operations, we can wait until REQ 1898 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1899 are nastier, since the device will be expecting more data than we 1900 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1901 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1902 why this signal was added to the newer chips) but on the older 538[01] 1903 this signal does not exist. The workaround for this lack is a watchdog; 1904 we bail out of the wait-loop after a modest amount of wait-time if 1905 the usual exit conditions are not met. Not a terribly clean or 1906 correct solution :-% 1907 1908 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1909 If the chip is in DMA mode for an READ, it will respond to a target's 1910 REQ by latching the SCSI data into the INPUT DATA register and asserting 1911 ACK, even if it has _already_ been notified by the DMA controller that 1912 the current DMA transfer has completed! If the NCR5380 is then taken 1913 out of DMA mode, this already-acknowledged byte is lost. 1914 1915 This is not a problem for "one DMA transfer per command" reads, because 1916 the situation will never arise... either all of the data is DMA'ed 1917 properly, or the target switches to MESSAGE IN phase to signal a 1918 disconnection (either operation bringing the DMA to a clean halt). 1919 However, in order to handle scatter-reads, we must work around the 1920 problem. The chosen fix is to DMA N-2 bytes, then check for the 1921 condition before taking the NCR5380 out of DMA mode. One or two extra 1922 bytes are transferred via PIO as necessary to fill out the original 1923 request. 1924 */ 1925 1926 if (p & SR_IO) { 1927 #ifdef READ_OVERRUNS 1928 udelay(10); 1929 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1930 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1931 overrun = 1; 1932 } 1933 #endif 1934 } else { 1935 int limit = 100; 1936 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1937 if (!(tmp & BASR_PHASE_MATCH)) 1938 break; 1939 if (--limit < 0) 1940 break; 1941 } 1942 } 1943 1944 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1945 1946 NCR5380_write(MODE_REG, MR_BASE); 1947 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1948 1949 residue = NCR5380_dma_residual(instance); 1950 c -= residue; 1951 *count -= c; 1952 *data += c; 1953 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1954 1955 #ifdef READ_OVERRUNS 1956 if (*phase == p && (p & SR_IO) && residue == 0) { 1957 if (overrun) { 1958 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1959 **data = saved_data; 1960 *data += 1; 1961 *count -= 1; 1962 cnt = toPIO = 1; 1963 } else { 1964 printk("No overrun??\n"); 1965 cnt = toPIO = 2; 1966 } 1967 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1968 NCR5380_transfer_pio(instance, phase, &cnt, data); 1969 *count -= toPIO - cnt; 1970 } 1971 #endif 1972 1973 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))); 1974 return 0; 1975 1976 #elif defined(REAL_DMA) 1977 return 0; 1978 #else /* defined(REAL_DMA_POLL) */ 1979 if (p & SR_IO) { 1980 #ifdef DMA_WORKS_RIGHT 1981 foo = NCR5380_pread(instance, d, c); 1982 #else 1983 int diff = 1; 1984 if (hostdata->flags & FLAG_NCR53C400) { 1985 diff = 0; 1986 } 1987 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1988 /* 1989 * We can't disable DMA mode after successfully transferring 1990 * what we plan to be the last byte, since that would open up 1991 * a race condition where if the target asserted REQ before 1992 * we got the DMA mode reset, the NCR5380 would have latched 1993 * an additional byte into the INPUT DATA register and we'd 1994 * have dropped it. 1995 * 1996 * The workaround was to transfer one fewer bytes than we 1997 * intended to with the pseudo-DMA read function, wait for 1998 * the chip to latch the last byte, read it, and then disable 1999 * pseudo-DMA mode. 2000 * 2001 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 2002 * REQ is deasserted when ACK is asserted, and not reasserted 2003 * until ACK goes false. Since the NCR5380 won't lower ACK 2004 * until DACK is asserted, which won't happen unless we twiddle 2005 * the DMA port or we take the NCR5380 out of DMA mode, we 2006 * can guarantee that we won't handshake another extra 2007 * byte. 2008 */ 2009 2010 if (!(hostdata->flags & FLAG_NCR53C400)) { 2011 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2012 /* Wait for clean handshake */ 2013 while (NCR5380_read(STATUS_REG) & SR_REQ); 2014 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2015 } 2016 } 2017 #endif 2018 } else { 2019 #ifdef DMA_WORKS_RIGHT 2020 foo = NCR5380_pwrite(instance, d, c); 2021 #else 2022 int timeout; 2023 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2024 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2025 /* 2026 * Wait for the last byte to be sent. If REQ is being asserted for 2027 * the byte we're interested, we'll ACK it and it will go false. 2028 */ 2029 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2030 timeout = 20000; 2031 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2032 2033 if (!timeout) 2034 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2035 2036 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2037 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2038 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2039 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2040 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2041 } 2042 } 2043 } else { 2044 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2045 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2046 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2047 } 2048 } 2049 #endif 2050 } 2051 NCR5380_write(MODE_REG, MR_BASE); 2052 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2053 2054 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2056 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2057 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2058 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2059 } else { 2060 printk("53C400w: IRQ NOT THERE!\n"); 2061 } 2062 } 2063 *data = d + c; 2064 *count = 0; 2065 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2066 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2067 spin_lock_irq(instance->host_lock); 2068 #endif /* defined(REAL_DMA_POLL) */ 2069 return foo; 2070 #endif /* def REAL_DMA */ 2071 } 2072 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2073 2074 /* 2075 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2076 * 2077 * Purpose : run through the various SCSI phases and do as the target 2078 * directs us to. Operates on the currently connected command, 2079 * instance->connected. 2080 * 2081 * Inputs : instance, instance for which we are doing commands 2082 * 2083 * Side effects : SCSI things happen, the disconnected queue will be 2084 * modified if a command disconnects, *instance->connected will 2085 * change. 2086 * 2087 * XXX Note : we need to watch for bus free or a reset condition here 2088 * to recover from an unexpected bus free condition. 2089 * 2090 * Locks: io_request_lock held by caller in IRQ mode 2091 */ 2092 2093 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2094 NCR5380_local_declare(); 2095 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2096 unsigned char msgout = NOP; 2097 int sink = 0; 2098 int len; 2099 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2100 int transfersize; 2101 #endif 2102 unsigned char *data; 2103 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2104 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2105 /* RvC: we need to set the end of the polling time */ 2106 unsigned long poll_time = jiffies + USLEEP_POLL; 2107 2108 NCR5380_setup(instance); 2109 2110 while (1) { 2111 tmp = NCR5380_read(STATUS_REG); 2112 /* We only have a valid SCSI phase when REQ is asserted */ 2113 if (tmp & SR_REQ) { 2114 phase = (tmp & PHASE_MASK); 2115 if (phase != old_phase) { 2116 old_phase = phase; 2117 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2118 } 2119 if (sink && (phase != PHASE_MSGOUT)) { 2120 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2121 2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2123 while (NCR5380_read(STATUS_REG) & SR_REQ); 2124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2125 sink = 0; 2126 continue; 2127 } 2128 switch (phase) { 2129 case PHASE_DATAIN: 2130 case PHASE_DATAOUT: 2131 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2132 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2133 sink = 1; 2134 do_abort(instance); 2135 cmd->result = DID_ERROR << 16; 2136 cmd->done(cmd); 2137 return; 2138 #endif 2139 /* 2140 * If there is no room left in the current buffer in the 2141 * scatter-gather list, move onto the next one. 2142 */ 2143 2144 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2145 ++cmd->SCp.buffer; 2146 --cmd->SCp.buffers_residual; 2147 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2148 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 2149 cmd->SCp.buffer->offset; 2150 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2151 } 2152 /* 2153 * The preferred transfer method is going to be 2154 * PSEUDO-DMA for systems that are strictly PIO, 2155 * since we can let the hardware do the handshaking. 2156 * 2157 * For this to work, we need to know the transfersize 2158 * ahead of time, since the pseudo-DMA code will sit 2159 * in an unconditional loop. 2160 */ 2161 2162 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2163 /* KLL 2164 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2165 * driver then it will always be defined, so the 2166 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2167 * NCR5380 case. I think this is a fairly clean solution. 2168 * We supplement these 2 if's with the flag. 2169 */ 2170 #ifdef NCR5380_dma_xfer_len 2171 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2172 #else 2173 transfersize = cmd->transfersize; 2174 2175 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2176 if (transfersize > 512) 2177 transfersize = 512; 2178 #endif /* LIMIT_TRANSFERSIZE */ 2179 2180 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2181 /* Limit transfers to 32K, for xx400 & xx406 2182 * pseudoDMA that transfers in 128 bytes blocks. */ 2183 if (transfersize > 32 * 1024) 2184 transfersize = 32 * 1024; 2185 #endif 2186 len = transfersize; 2187 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2188 /* 2189 * If the watchdog timer fires, all future accesses to this 2190 * device will use the polled-IO. 2191 */ 2192 scmd_printk(KERN_INFO, cmd, 2193 "switching to slow handshake\n"); 2194 cmd->device->borken = 1; 2195 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2196 sink = 1; 2197 do_abort(instance); 2198 cmd->result = DID_ERROR << 16; 2199 cmd->done(cmd); 2200 /* XXX - need to source or sink data here, as appropriate */ 2201 } else 2202 cmd->SCp.this_residual -= transfersize - len; 2203 } else 2204 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2205 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2206 &cmd->SCp.ptr); 2207 break; 2208 case PHASE_MSGIN: 2209 len = 1; 2210 data = &tmp; 2211 NCR5380_transfer_pio(instance, &phase, &len, &data); 2212 cmd->SCp.Message = tmp; 2213 2214 switch (tmp) { 2215 /* 2216 * Linking lets us reduce the time required to get the 2217 * next command out to the device, hopefully this will 2218 * mean we don't waste another revolution due to the delays 2219 * required by ARBITRATION and another SELECTION. 2220 * 2221 * In the current implementation proposal, low level drivers 2222 * merely have to start the next command, pointed to by 2223 * next_link, done() is called as with unlinked commands. 2224 */ 2225 #ifdef LINKED 2226 case LINKED_CMD_COMPLETE: 2227 case LINKED_FLG_CMD_COMPLETE: 2228 /* Accept message by clearing ACK */ 2229 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2230 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2231 /* 2232 * Sanity check : A linked command should only terminate with 2233 * one of these messages if there are more linked commands 2234 * available. 2235 */ 2236 if (!cmd->next_link) { 2237 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2238 sink = 1; 2239 do_abort(instance); 2240 return; 2241 } 2242 initialize_SCp(cmd->next_link); 2243 /* The next command is still part of this process */ 2244 cmd->next_link->tag = cmd->tag; 2245 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2246 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2247 collect_stats(hostdata, cmd); 2248 cmd->scsi_done(cmd); 2249 cmd = hostdata->connected; 2250 break; 2251 #endif /* def LINKED */ 2252 case ABORT: 2253 case COMMAND_COMPLETE: 2254 /* Accept message by clearing ACK */ 2255 sink = 1; 2256 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2257 hostdata->connected = NULL; 2258 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2259 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2260 2261 /* 2262 * I'm not sure what the correct thing to do here is : 2263 * 2264 * If the command that just executed is NOT a request 2265 * sense, the obvious thing to do is to set the result 2266 * code to the values of the stored parameters. 2267 * 2268 * If it was a REQUEST SENSE command, we need some way 2269 * to differentiate between the failure code of the original 2270 * and the failure code of the REQUEST sense - the obvious 2271 * case is success, where we fall through and leave the result 2272 * code unchanged. 2273 * 2274 * The non-obvious place is where the REQUEST SENSE failed 2275 */ 2276 2277 if (cmd->cmnd[0] != REQUEST_SENSE) 2278 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2279 else if (status_byte(cmd->SCp.Status) != GOOD) 2280 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2281 2282 #ifdef AUTOSENSE 2283 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2284 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2285 cmd->cmnd[0] = REQUEST_SENSE; 2286 cmd->cmnd[1] &= 0xe0; 2287 cmd->cmnd[2] = 0; 2288 cmd->cmnd[3] = 0; 2289 cmd->cmnd[4] = sizeof(cmd->sense_buffer); 2290 cmd->cmnd[5] = 0; 2291 2292 cmd->SCp.buffer = NULL; 2293 cmd->SCp.buffers_residual = 0; 2294 cmd->SCp.ptr = (char *) cmd->sense_buffer; 2295 cmd->SCp.this_residual = sizeof(cmd->sense_buffer); 2296 2297 LIST(cmd, hostdata->issue_queue); 2298 cmd->host_scribble = (unsigned char *) 2299 hostdata->issue_queue; 2300 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2301 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2302 } else 2303 #endif /* def AUTOSENSE */ 2304 { 2305 collect_stats(hostdata, cmd); 2306 cmd->scsi_done(cmd); 2307 } 2308 2309 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2310 /* 2311 * Restore phase bits to 0 so an interrupted selection, 2312 * arbitration can resume. 2313 */ 2314 NCR5380_write(TARGET_COMMAND_REG, 0); 2315 2316 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2317 barrier(); 2318 return; 2319 case MESSAGE_REJECT: 2320 /* Accept message by clearing ACK */ 2321 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2322 switch (hostdata->last_message) { 2323 case HEAD_OF_QUEUE_TAG: 2324 case ORDERED_QUEUE_TAG: 2325 case SIMPLE_QUEUE_TAG: 2326 cmd->device->simple_tags = 0; 2327 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2328 break; 2329 default: 2330 break; 2331 } 2332 case DISCONNECT:{ 2333 /* Accept message by clearing ACK */ 2334 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2335 cmd->device->disconnect = 1; 2336 LIST(cmd, hostdata->disconnected_queue); 2337 cmd->host_scribble = (unsigned char *) 2338 hostdata->disconnected_queue; 2339 hostdata->connected = NULL; 2340 hostdata->disconnected_queue = cmd; 2341 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2342 /* 2343 * Restore phase bits to 0 so an interrupted selection, 2344 * arbitration can resume. 2345 */ 2346 NCR5380_write(TARGET_COMMAND_REG, 0); 2347 2348 /* Enable reselect interrupts */ 2349 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2350 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2351 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2352 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2353 barrier(); 2354 return; 2355 } 2356 /* 2357 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2358 * operation, in violation of the SCSI spec so we can safely 2359 * ignore SAVE/RESTORE pointers calls. 2360 * 2361 * Unfortunately, some disks violate the SCSI spec and 2362 * don't issue the required SAVE_POINTERS message before 2363 * disconnecting, and we have to break spec to remain 2364 * compatible. 2365 */ 2366 case SAVE_POINTERS: 2367 case RESTORE_POINTERS: 2368 /* Accept message by clearing ACK */ 2369 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2370 break; 2371 case EXTENDED_MESSAGE: 2372 /* 2373 * Extended messages are sent in the following format : 2374 * Byte 2375 * 0 EXTENDED_MESSAGE == 1 2376 * 1 length (includes one byte for code, doesn't 2377 * include first two bytes) 2378 * 2 code 2379 * 3..length+1 arguments 2380 * 2381 * Start the extended message buffer with the EXTENDED_MESSAGE 2382 * byte, since spi_print_msg() wants the whole thing. 2383 */ 2384 extended_msg[0] = EXTENDED_MESSAGE; 2385 /* Accept first byte by clearing ACK */ 2386 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2387 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2388 2389 len = 2; 2390 data = extended_msg + 1; 2391 phase = PHASE_MSGIN; 2392 NCR5380_transfer_pio(instance, &phase, &len, &data); 2393 2394 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2395 2396 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2397 /* Accept third byte by clearing ACK */ 2398 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2399 len = extended_msg[1] - 1; 2400 data = extended_msg + 3; 2401 phase = PHASE_MSGIN; 2402 2403 NCR5380_transfer_pio(instance, &phase, &len, &data); 2404 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2405 2406 switch (extended_msg[2]) { 2407 case EXTENDED_SDTR: 2408 case EXTENDED_WDTR: 2409 case EXTENDED_MODIFY_DATA_POINTER: 2410 case EXTENDED_EXTENDED_IDENTIFY: 2411 tmp = 0; 2412 } 2413 } else if (len) { 2414 printk("scsi%d: error receiving extended message\n", instance->host_no); 2415 tmp = 0; 2416 } else { 2417 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2418 tmp = 0; 2419 } 2420 /* Fall through to reject message */ 2421 2422 /* 2423 * If we get something weird that we aren't expecting, 2424 * reject it. 2425 */ 2426 default: 2427 if (!tmp) { 2428 printk("scsi%d: rejecting message ", instance->host_no); 2429 spi_print_msg(extended_msg); 2430 printk("\n"); 2431 } else if (tmp != EXTENDED_MESSAGE) 2432 scmd_printk(KERN_INFO, cmd, 2433 "rejecting unknown message %02x\n",tmp); 2434 else 2435 scmd_printk(KERN_INFO, cmd, 2436 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2437 2438 msgout = MESSAGE_REJECT; 2439 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2440 break; 2441 } /* switch (tmp) */ 2442 break; 2443 case PHASE_MSGOUT: 2444 len = 1; 2445 data = &msgout; 2446 hostdata->last_message = msgout; 2447 NCR5380_transfer_pio(instance, &phase, &len, &data); 2448 if (msgout == ABORT) { 2449 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2450 hostdata->connected = NULL; 2451 cmd->result = DID_ERROR << 16; 2452 collect_stats(hostdata, cmd); 2453 cmd->scsi_done(cmd); 2454 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2455 return; 2456 } 2457 msgout = NOP; 2458 break; 2459 case PHASE_CMDOUT: 2460 len = cmd->cmd_len; 2461 data = cmd->cmnd; 2462 /* 2463 * XXX for performance reasons, on machines with a 2464 * PSEUDO-DMA architecture we should probably 2465 * use the dma transfer function. 2466 */ 2467 NCR5380_transfer_pio(instance, &phase, &len, &data); 2468 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2469 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2470 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2471 return; 2472 } 2473 break; 2474 case PHASE_STATIN: 2475 len = 1; 2476 data = &tmp; 2477 NCR5380_transfer_pio(instance, &phase, &len, &data); 2478 cmd->SCp.Status = tmp; 2479 break; 2480 default: 2481 printk("scsi%d : unknown phase\n", instance->host_no); 2482 NCR5380_dprint(NDEBUG_ALL, instance); 2483 } /* switch(phase) */ 2484 } /* if (tmp * SR_REQ) */ 2485 else { 2486 /* RvC: go to sleep if polling time expired 2487 */ 2488 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2489 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2490 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2491 return; 2492 } 2493 } 2494 } /* while (1) */ 2495 } 2496 2497 /* 2498 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2499 * 2500 * Purpose : does reselection, initializing the instance->connected 2501 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2502 * nexus has been reestablished, 2503 * 2504 * Inputs : instance - this instance of the NCR5380. 2505 * 2506 * Locks: io_request_lock held by caller if IRQ driven 2507 */ 2508 2509 static void NCR5380_reselect(struct Scsi_Host *instance) { 2510 NCR5380_local_declare(); 2511 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2512 instance->hostdata; 2513 unsigned char target_mask; 2514 unsigned char lun, phase; 2515 int len; 2516 unsigned char msg[3]; 2517 unsigned char *data; 2518 Scsi_Cmnd *tmp = NULL, *prev; 2519 int abort = 0; 2520 NCR5380_setup(instance); 2521 2522 /* 2523 * Disable arbitration, etc. since the host adapter obviously 2524 * lost, and tell an interrupted NCR5380_select() to restart. 2525 */ 2526 2527 NCR5380_write(MODE_REG, MR_BASE); 2528 hostdata->restart_select = 1; 2529 2530 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2531 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); 2532 2533 /* 2534 * At this point, we have detected that our SCSI ID is on the bus, 2535 * SEL is true and BSY was false for at least one bus settle delay 2536 * (400 ns). 2537 * 2538 * We must assert BSY ourselves, until the target drops the SEL 2539 * signal. 2540 */ 2541 2542 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2543 2544 /* FIXME: timeout too long, must fail to workqueue */ 2545 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2546 abort = 1; 2547 2548 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2549 2550 /* 2551 * Wait for target to go into MSGIN. 2552 * FIXME: timeout needed and fail to work queeu 2553 */ 2554 2555 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2556 abort = 1; 2557 2558 len = 1; 2559 data = msg; 2560 phase = PHASE_MSGIN; 2561 NCR5380_transfer_pio(instance, &phase, &len, &data); 2562 2563 if (!(msg[0] & 0x80)) { 2564 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2565 spi_print_msg(msg); 2566 abort = 1; 2567 } else { 2568 /* Accept message by clearing ACK */ 2569 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2570 lun = (msg[0] & 0x07); 2571 2572 /* 2573 * We need to add code for SCSI-II to track which devices have 2574 * I_T_L_Q nexuses established, and which have simple I_T_L 2575 * nexuses so we can chose to do additional data transfer. 2576 */ 2577 2578 /* 2579 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2580 * just reestablished, and remove it from the disconnected queue. 2581 */ 2582 2583 2584 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2585 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2586 ) { 2587 if (prev) { 2588 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2589 prev->host_scribble = tmp->host_scribble; 2590 } else { 2591 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2592 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2593 } 2594 tmp->host_scribble = NULL; 2595 break; 2596 } 2597 if (!tmp) { 2598 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2599 /* 2600 * Since we have an established nexus that we can't do anything with, 2601 * we must abort it. 2602 */ 2603 abort = 1; 2604 } 2605 } 2606 2607 if (abort) { 2608 do_abort(instance); 2609 } else { 2610 hostdata->connected = tmp; 2611 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); 2612 } 2613 } 2614 2615 /* 2616 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2617 * 2618 * Purpose : called by interrupt handler when DMA finishes or a phase 2619 * mismatch occurs (which would finish the DMA transfer). 2620 * 2621 * Inputs : instance - this instance of the NCR5380. 2622 * 2623 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2624 * nexus has been reestablished, on failure NULL is returned. 2625 */ 2626 2627 #ifdef REAL_DMA 2628 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2629 NCR5380_local_declare(); 2630 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2631 int transferred; 2632 NCR5380_setup(instance); 2633 2634 /* 2635 * XXX this might not be right. 2636 * 2637 * Wait for final byte to transfer, ie wait for ACK to go false. 2638 * 2639 * We should use the Last Byte Sent bit, unfortunately this is 2640 * not available on the 5380/5381 (only the various CMOS chips) 2641 * 2642 * FIXME: timeout, and need to handle long timeout/irq case 2643 */ 2644 2645 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2646 2647 NCR5380_write(MODE_REG, MR_BASE); 2648 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2649 2650 /* 2651 * The only places we should see a phase mismatch and have to send 2652 * data from the same set of pointers will be the data transfer 2653 * phases. So, residual, requested length are only important here. 2654 */ 2655 2656 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2657 transferred = instance->dmalen - NCR5380_dma_residual(); 2658 hostdata->connected->SCp.this_residual -= transferred; 2659 hostdata->connected->SCp.ptr += transferred; 2660 } 2661 } 2662 #endif /* def REAL_DMA */ 2663 2664 /* 2665 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2666 * 2667 * Purpose : abort a command 2668 * 2669 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2670 * host byte of the result field to, if zero DID_ABORTED is 2671 * used. 2672 * 2673 * Returns : 0 - success, -1 on failure. 2674 * 2675 * XXX - there is no way to abort the command that is currently 2676 * connected, you have to wait for it to complete. If this is 2677 * a problem, we could implement longjmp() / setjmp(), setjmp() 2678 * called where the loop started in NCR5380_main(). 2679 * 2680 * Locks: host lock taken by caller 2681 */ 2682 2683 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2684 NCR5380_local_declare(); 2685 struct Scsi_Host *instance = cmd->device->host; 2686 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2687 Scsi_Cmnd *tmp, **prev; 2688 2689 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2690 scsi_print_command(cmd); 2691 2692 NCR5380_print_status(instance); 2693 2694 NCR5380_setup(instance); 2695 2696 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); 2697 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); 2698 2699 #if 0 2700 /* 2701 * Case 1 : If the command is the currently executing command, 2702 * we'll set the aborted flag and return control so that 2703 * information transfer routine can exit cleanly. 2704 */ 2705 2706 if (hostdata->connected == cmd) { 2707 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); 2708 hostdata->aborted = 1; 2709 /* 2710 * We should perform BSY checking, and make sure we haven't slipped 2711 * into BUS FREE. 2712 */ 2713 2714 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2715 /* 2716 * Since we can't change phases until we've completed the current 2717 * handshake, we have to source or sink a byte of data if the current 2718 * phase is not MSGOUT. 2719 */ 2720 2721 /* 2722 * Return control to the executing NCR drive so we can clear the 2723 * aborted flag and get back into our main loop. 2724 */ 2725 2726 return 0; 2727 } 2728 #endif 2729 2730 /* 2731 * Case 2 : If the command hasn't been issued yet, we simply remove it 2732 * from the issue queue. 2733 */ 2734 2735 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); 2736 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) 2737 if (cmd == tmp) { 2738 REMOVE(5, *prev, tmp, tmp->host_scribble); 2739 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2740 tmp->host_scribble = NULL; 2741 tmp->result = DID_ABORT << 16; 2742 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); 2743 tmp->done(tmp); 2744 return SUCCESS; 2745 } 2746 #if (NDEBUG & NDEBUG_ABORT) 2747 /* KLL */ 2748 else if (prev == tmp) 2749 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2750 #endif 2751 2752 /* 2753 * Case 3 : If any commands are connected, we're going to fail the abort 2754 * and let the high level SCSI driver retry at a later time or 2755 * issue a reset. 2756 * 2757 * Timeouts, and therefore aborted commands, will be highly unlikely 2758 * and handling them cleanly in this situation would make the common 2759 * case of noresets less efficient, and would pollute our code. So, 2760 * we fail. 2761 */ 2762 2763 if (hostdata->connected) { 2764 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); 2765 return FAILED; 2766 } 2767 /* 2768 * Case 4: If the command is currently disconnected from the bus, and 2769 * there are no connected commands, we reconnect the I_T_L or 2770 * I_T_L_Q nexus associated with it, go into message out, and send 2771 * an abort message. 2772 * 2773 * This case is especially ugly. In order to reestablish the nexus, we 2774 * need to call NCR5380_select(). The easiest way to implement this 2775 * function was to abort if the bus was busy, and let the interrupt 2776 * handler triggered on the SEL for reselect take care of lost arbitrations 2777 * where necessary, meaning interrupts need to be enabled. 2778 * 2779 * When interrupts are enabled, the queues may change - so we 2780 * can't remove it from the disconnected queue before selecting it 2781 * because that could cause a failure in hashing the nexus if that 2782 * device reselected. 2783 * 2784 * Since the queues may change, we can't use the pointers from when we 2785 * first locate it. 2786 * 2787 * So, we must first locate the command, and if NCR5380_select() 2788 * succeeds, then issue the abort, relocate the command and remove 2789 * it from the disconnected queue. 2790 */ 2791 2792 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2793 if (cmd == tmp) { 2794 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); 2795 2796 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2797 return FAILED; 2798 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); 2799 2800 do_abort(instance); 2801 2802 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) 2803 if (cmd == tmp) { 2804 REMOVE(5, *prev, tmp, tmp->host_scribble); 2805 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2806 tmp->host_scribble = NULL; 2807 tmp->result = DID_ABORT << 16; 2808 tmp->done(tmp); 2809 return SUCCESS; 2810 } 2811 } 2812 /* 2813 * Case 5 : If we reached this point, the command was not found in any of 2814 * the queues. 2815 * 2816 * We probably reached this point because of an unlikely race condition 2817 * between the command completing successfully and the abortion code, 2818 * so we won't panic, but we will notify the user in case something really 2819 * broke. 2820 */ 2821 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2822 " before abortion\n", instance->host_no); 2823 return FAILED; 2824 } 2825 2826 2827 /* 2828 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2829 * 2830 * Purpose : reset the SCSI bus. 2831 * 2832 * Returns : SUCCESS 2833 * 2834 * Locks: host lock taken by caller 2835 */ 2836 2837 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2838 { 2839 struct Scsi_Host *instance = cmd->device->host; 2840 2841 NCR5380_local_declare(); 2842 NCR5380_setup(instance); 2843 NCR5380_print_status(instance); 2844 2845 spin_lock_irq(instance->host_lock); 2846 do_reset(instance); 2847 spin_unlock_irq(instance->host_lock); 2848 2849 return SUCCESS; 2850 } 2851