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 initialize_SCp(cmd); 1546 1547 return 0; 1548 1549 /* Selection failed */ 1550 failed: 1551 return -1; 1552 1553 } 1554 1555 /* 1556 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1557 * unsigned char *phase, int *count, unsigned char **data) 1558 * 1559 * Purpose : transfers data in given phase using polled I/O 1560 * 1561 * Inputs : instance - instance of driver, *phase - pointer to 1562 * what phase is expected, *count - pointer to number of 1563 * bytes to transfer, **data - pointer to data pointer. 1564 * 1565 * Returns : -1 when different phase is entered without transferring 1566 * maximum number of bytes, 0 if all bytes or transfered or exit 1567 * is in same phase. 1568 * 1569 * Also, *phase, *count, *data are modified in place. 1570 * 1571 * XXX Note : handling for bus free may be useful. 1572 */ 1573 1574 /* 1575 * Note : this code is not as quick as it could be, however it 1576 * IS 100% reliable, and for the actual data transfer where speed 1577 * counts, we will always do a pseudo DMA or DMA transfer. 1578 */ 1579 1580 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1581 NCR5380_local_declare(); 1582 unsigned char p = *phase, tmp; 1583 int c = *count; 1584 unsigned char *d = *data; 1585 /* 1586 * RvC: some administrative data to process polling time 1587 */ 1588 int break_allowed = 0; 1589 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1590 NCR5380_setup(instance); 1591 1592 if (!(p & SR_IO)) 1593 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); 1594 else 1595 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); 1596 1597 /* 1598 * The NCR5380 chip will only drive the SCSI bus when the 1599 * phase specified in the appropriate bits of the TARGET COMMAND 1600 * REGISTER match the STATUS REGISTER 1601 */ 1602 1603 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1604 1605 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1606 * so breaks are not necessary there 1607 */ 1608 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1609 break_allowed = 1; 1610 } 1611 do { 1612 /* 1613 * Wait for assertion of REQ, after which the phase bits will be 1614 * valid 1615 */ 1616 1617 /* RvC: we simply poll once, after that we stop temporarily 1618 * and let the device buffer fill up 1619 * if breaking is not allowed, we keep polling as long as needed 1620 */ 1621 1622 /* FIXME */ 1623 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1624 if (!(tmp & SR_REQ)) { 1625 /* timeout condition */ 1626 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1627 break; 1628 } 1629 1630 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); 1631 1632 /* Check for phase mismatch */ 1633 if ((tmp & PHASE_MASK) != p) { 1634 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); 1635 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1636 break; 1637 } 1638 /* Do actual transfer from SCSI bus to / from memory */ 1639 if (!(p & SR_IO)) 1640 NCR5380_write(OUTPUT_DATA_REG, *d); 1641 else 1642 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1643 1644 ++d; 1645 1646 /* 1647 * The SCSI standard suggests that in MSGOUT phase, the initiator 1648 * should drop ATN on the last byte of the message phase 1649 * after REQ has been asserted for the handshake but before 1650 * the initiator raises ACK. 1651 */ 1652 1653 if (!(p & SR_IO)) { 1654 if (!((p & SR_MSG) && c > 1)) { 1655 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1656 NCR5380_dprint(NDEBUG_PIO, instance); 1657 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1658 } else { 1659 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1660 NCR5380_dprint(NDEBUG_PIO, instance); 1661 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1662 } 1663 } else { 1664 NCR5380_dprint(NDEBUG_PIO, instance); 1665 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1666 } 1667 1668 /* FIXME - if this fails bus reset ?? */ 1669 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1670 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); 1671 1672 /* 1673 * We have several special cases to consider during REQ/ACK handshaking : 1674 * 1. We were in MSGOUT phase, and we are on the last byte of the 1675 * message. ATN must be dropped as ACK is dropped. 1676 * 1677 * 2. We are in a MSGIN phase, and we are on the last byte of the 1678 * message. We must exit with ACK asserted, so that the calling 1679 * code may raise ATN before dropping ACK to reject the message. 1680 * 1681 * 3. ACK and ATN are clear and the target may proceed as normal. 1682 */ 1683 if (!(p == PHASE_MSGIN && c == 1)) { 1684 if (p == PHASE_MSGOUT && c > 1) 1685 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1686 else 1687 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1688 } 1689 } while (--c); 1690 1691 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); 1692 1693 *count = c; 1694 *data = d; 1695 tmp = NCR5380_read(STATUS_REG); 1696 if (tmp & SR_REQ) 1697 *phase = tmp & PHASE_MASK; 1698 else 1699 *phase = PHASE_UNKNOWN; 1700 1701 if (!c || (*phase == p)) 1702 return 0; 1703 else 1704 return -1; 1705 } 1706 1707 /** 1708 * do_reset - issue a reset command 1709 * @host: adapter to reset 1710 * 1711 * Issue a reset sequence to the NCR5380 and try and get the bus 1712 * back into sane shape. 1713 * 1714 * Locks: caller holds queue lock 1715 */ 1716 1717 static void do_reset(struct Scsi_Host *host) { 1718 NCR5380_local_declare(); 1719 NCR5380_setup(host); 1720 1721 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1722 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1723 udelay(25); 1724 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1725 } 1726 1727 /* 1728 * Function : do_abort (Scsi_Host *host) 1729 * 1730 * Purpose : abort the currently established nexus. Should only be 1731 * called from a routine which can drop into a 1732 * 1733 * Returns : 0 on success, -1 on failure. 1734 * 1735 * Locks: queue lock held by caller 1736 * FIXME: sort this out and get new_eh running 1737 */ 1738 1739 static int do_abort(struct Scsi_Host *host) { 1740 NCR5380_local_declare(); 1741 unsigned char *msgptr, phase, tmp; 1742 int len; 1743 int rc; 1744 NCR5380_setup(host); 1745 1746 1747 /* Request message out phase */ 1748 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1749 1750 /* 1751 * Wait for the target to indicate a valid phase by asserting 1752 * REQ. Once this happens, we'll have either a MSGOUT phase 1753 * and can immediately send the ABORT message, or we'll have some 1754 * other phase and will have to source/sink data. 1755 * 1756 * We really don't care what value was on the bus or what value 1757 * the target sees, so we just handshake. 1758 */ 1759 1760 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1761 1762 if(rc < 0) 1763 return -1; 1764 1765 tmp = (unsigned char)rc; 1766 1767 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1768 1769 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1770 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1771 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1772 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1773 if(rc == -1) 1774 return -1; 1775 } 1776 tmp = ABORT; 1777 msgptr = &tmp; 1778 len = 1; 1779 phase = PHASE_MSGOUT; 1780 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1781 1782 /* 1783 * If we got here, and the command completed successfully, 1784 * we're about to go into bus free state. 1785 */ 1786 1787 return len ? -1 : 0; 1788 } 1789 1790 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1791 /* 1792 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1793 * unsigned char *phase, int *count, unsigned char **data) 1794 * 1795 * Purpose : transfers data in given phase using either real 1796 * or pseudo DMA. 1797 * 1798 * Inputs : instance - instance of driver, *phase - pointer to 1799 * what phase is expected, *count - pointer to number of 1800 * bytes to transfer, **data - pointer to data pointer. 1801 * 1802 * Returns : -1 when different phase is entered without transferring 1803 * maximum number of bytes, 0 if all bytes or transfered or exit 1804 * is in same phase. 1805 * 1806 * Also, *phase, *count, *data are modified in place. 1807 * 1808 * Locks: io_request lock held by caller 1809 */ 1810 1811 1812 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1813 NCR5380_local_declare(); 1814 register int c = *count; 1815 register unsigned char p = *phase; 1816 register unsigned char *d = *data; 1817 unsigned char tmp; 1818 int foo; 1819 #if defined(REAL_DMA_POLL) 1820 int cnt, toPIO; 1821 unsigned char saved_data = 0, overrun = 0, residue; 1822 #endif 1823 1824 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1825 1826 NCR5380_setup(instance); 1827 1828 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1829 *phase = tmp; 1830 return -1; 1831 } 1832 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1833 #ifdef READ_OVERRUNS 1834 if (p & SR_IO) { 1835 c -= 2; 1836 } 1837 #endif 1838 dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d)); 1839 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1840 #endif 1841 1842 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1843 1844 #ifdef REAL_DMA 1845 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1846 #elif defined(REAL_DMA_POLL) 1847 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1848 #else 1849 /* 1850 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1851 * were not disabled for the duration of a single DMA transfer, from 1852 * before the setting of DMA mode to after transfer of the last byte. 1853 */ 1854 1855 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1856 spin_unlock_irq(instance->host_lock); 1857 #endif 1858 /* KLL May need eop and parity in 53c400 */ 1859 if (hostdata->flags & FLAG_NCR53C400) 1860 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY); 1861 else 1862 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1863 #endif /* def REAL_DMA */ 1864 1865 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1866 1867 /* 1868 * On the PAS16 at least I/O recovery delays are not needed here. 1869 * Everyone else seems to want them. 1870 */ 1871 1872 if (p & SR_IO) { 1873 io_recovery_delay(1); 1874 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1875 } else { 1876 io_recovery_delay(1); 1877 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1878 io_recovery_delay(1); 1879 NCR5380_write(START_DMA_SEND_REG, 0); 1880 io_recovery_delay(1); 1881 } 1882 1883 #if defined(REAL_DMA_POLL) 1884 do { 1885 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1886 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1887 1888 /* 1889 At this point, either we've completed DMA, or we have a phase mismatch, 1890 or we've unexpectedly lost BUSY (which is a real error). 1891 1892 For write DMAs, we want to wait until the last byte has been 1893 transferred out over the bus before we turn off DMA mode. Alas, there 1894 seems to be no terribly good way of doing this on a 5380 under all 1895 conditions. For non-scatter-gather operations, we can wait until REQ 1896 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1897 are nastier, since the device will be expecting more data than we 1898 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1899 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1900 why this signal was added to the newer chips) but on the older 538[01] 1901 this signal does not exist. The workaround for this lack is a watchdog; 1902 we bail out of the wait-loop after a modest amount of wait-time if 1903 the usual exit conditions are not met. Not a terribly clean or 1904 correct solution :-% 1905 1906 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1907 If the chip is in DMA mode for an READ, it will respond to a target's 1908 REQ by latching the SCSI data into the INPUT DATA register and asserting 1909 ACK, even if it has _already_ been notified by the DMA controller that 1910 the current DMA transfer has completed! If the NCR5380 is then taken 1911 out of DMA mode, this already-acknowledged byte is lost. 1912 1913 This is not a problem for "one DMA transfer per command" reads, because 1914 the situation will never arise... either all of the data is DMA'ed 1915 properly, or the target switches to MESSAGE IN phase to signal a 1916 disconnection (either operation bringing the DMA to a clean halt). 1917 However, in order to handle scatter-reads, we must work around the 1918 problem. The chosen fix is to DMA N-2 bytes, then check for the 1919 condition before taking the NCR5380 out of DMA mode. One or two extra 1920 bytes are transferred via PIO as necessary to fill out the original 1921 request. 1922 */ 1923 1924 if (p & SR_IO) { 1925 #ifdef READ_OVERRUNS 1926 udelay(10); 1927 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1928 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1929 overrun = 1; 1930 } 1931 #endif 1932 } else { 1933 int limit = 100; 1934 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1935 if (!(tmp & BASR_PHASE_MATCH)) 1936 break; 1937 if (--limit < 0) 1938 break; 1939 } 1940 } 1941 1942 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1943 1944 NCR5380_write(MODE_REG, MR_BASE); 1945 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1946 1947 residue = NCR5380_dma_residual(instance); 1948 c -= residue; 1949 *count -= c; 1950 *data += c; 1951 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1952 1953 #ifdef READ_OVERRUNS 1954 if (*phase == p && (p & SR_IO) && residue == 0) { 1955 if (overrun) { 1956 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1957 **data = saved_data; 1958 *data += 1; 1959 *count -= 1; 1960 cnt = toPIO = 1; 1961 } else { 1962 printk("No overrun??\n"); 1963 cnt = toPIO = 2; 1964 } 1965 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1966 NCR5380_transfer_pio(instance, phase, &cnt, data); 1967 *count -= toPIO - cnt; 1968 } 1969 #endif 1970 1971 dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count))); 1972 return 0; 1973 1974 #elif defined(REAL_DMA) 1975 return 0; 1976 #else /* defined(REAL_DMA_POLL) */ 1977 if (p & SR_IO) { 1978 #ifdef DMA_WORKS_RIGHT 1979 foo = NCR5380_pread(instance, d, c); 1980 #else 1981 int diff = 1; 1982 if (hostdata->flags & FLAG_NCR53C400) { 1983 diff = 0; 1984 } 1985 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1986 /* 1987 * We can't disable DMA mode after successfully transferring 1988 * what we plan to be the last byte, since that would open up 1989 * a race condition where if the target asserted REQ before 1990 * we got the DMA mode reset, the NCR5380 would have latched 1991 * an additional byte into the INPUT DATA register and we'd 1992 * have dropped it. 1993 * 1994 * The workaround was to transfer one fewer bytes than we 1995 * intended to with the pseudo-DMA read function, wait for 1996 * the chip to latch the last byte, read it, and then disable 1997 * pseudo-DMA mode. 1998 * 1999 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 2000 * REQ is deasserted when ACK is asserted, and not reasserted 2001 * until ACK goes false. Since the NCR5380 won't lower ACK 2002 * until DACK is asserted, which won't happen unless we twiddle 2003 * the DMA port or we take the NCR5380 out of DMA mode, we 2004 * can guarantee that we won't handshake another extra 2005 * byte. 2006 */ 2007 2008 if (!(hostdata->flags & FLAG_NCR53C400)) { 2009 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2010 /* Wait for clean handshake */ 2011 while (NCR5380_read(STATUS_REG) & SR_REQ); 2012 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2013 } 2014 } 2015 #endif 2016 } else { 2017 #ifdef DMA_WORKS_RIGHT 2018 foo = NCR5380_pwrite(instance, d, c); 2019 #else 2020 int timeout; 2021 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2022 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2023 /* 2024 * Wait for the last byte to be sent. If REQ is being asserted for 2025 * the byte we're interested, we'll ACK it and it will go false. 2026 */ 2027 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2028 timeout = 20000; 2029 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2030 2031 if (!timeout) 2032 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2033 2034 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2035 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2036 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2037 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2038 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2039 } 2040 } 2041 } else { 2042 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2043 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2044 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2045 } 2046 } 2047 #endif 2048 } 2049 NCR5380_write(MODE_REG, MR_BASE); 2050 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2051 2052 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2053 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2054 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2056 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2057 } else { 2058 printk("53C400w: IRQ NOT THERE!\n"); 2059 } 2060 } 2061 *data = d + c; 2062 *count = 0; 2063 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2064 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2065 spin_lock_irq(instance->host_lock); 2066 #endif /* defined(REAL_DMA_POLL) */ 2067 return foo; 2068 #endif /* def REAL_DMA */ 2069 } 2070 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2071 2072 /* 2073 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2074 * 2075 * Purpose : run through the various SCSI phases and do as the target 2076 * directs us to. Operates on the currently connected command, 2077 * instance->connected. 2078 * 2079 * Inputs : instance, instance for which we are doing commands 2080 * 2081 * Side effects : SCSI things happen, the disconnected queue will be 2082 * modified if a command disconnects, *instance->connected will 2083 * change. 2084 * 2085 * XXX Note : we need to watch for bus free or a reset condition here 2086 * to recover from an unexpected bus free condition. 2087 * 2088 * Locks: io_request_lock held by caller in IRQ mode 2089 */ 2090 2091 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2092 NCR5380_local_declare(); 2093 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2094 unsigned char msgout = NOP; 2095 int sink = 0; 2096 int len; 2097 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2098 int transfersize; 2099 #endif 2100 unsigned char *data; 2101 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2102 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2103 /* RvC: we need to set the end of the polling time */ 2104 unsigned long poll_time = jiffies + USLEEP_POLL; 2105 2106 NCR5380_setup(instance); 2107 2108 while (1) { 2109 tmp = NCR5380_read(STATUS_REG); 2110 /* We only have a valid SCSI phase when REQ is asserted */ 2111 if (tmp & SR_REQ) { 2112 phase = (tmp & PHASE_MASK); 2113 if (phase != old_phase) { 2114 old_phase = phase; 2115 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2116 } 2117 if (sink && (phase != PHASE_MSGOUT)) { 2118 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2119 2120 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2121 while (NCR5380_read(STATUS_REG) & SR_REQ); 2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2123 sink = 0; 2124 continue; 2125 } 2126 switch (phase) { 2127 case PHASE_DATAIN: 2128 case PHASE_DATAOUT: 2129 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2130 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2131 sink = 1; 2132 do_abort(instance); 2133 cmd->result = DID_ERROR << 16; 2134 cmd->scsi_done(cmd); 2135 return; 2136 #endif 2137 /* 2138 * If there is no room left in the current buffer in the 2139 * scatter-gather list, move onto the next one. 2140 */ 2141 2142 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2143 ++cmd->SCp.buffer; 2144 --cmd->SCp.buffers_residual; 2145 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2146 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ 2147 cmd->SCp.buffer->offset; 2148 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2149 } 2150 /* 2151 * The preferred transfer method is going to be 2152 * PSEUDO-DMA for systems that are strictly PIO, 2153 * since we can let the hardware do the handshaking. 2154 * 2155 * For this to work, we need to know the transfersize 2156 * ahead of time, since the pseudo-DMA code will sit 2157 * in an unconditional loop. 2158 */ 2159 2160 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2161 /* KLL 2162 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2163 * driver then it will always be defined, so the 2164 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2165 * NCR5380 case. I think this is a fairly clean solution. 2166 * We supplement these 2 if's with the flag. 2167 */ 2168 #ifdef NCR5380_dma_xfer_len 2169 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2170 #else 2171 transfersize = cmd->transfersize; 2172 2173 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2174 if (transfersize > 512) 2175 transfersize = 512; 2176 #endif /* LIMIT_TRANSFERSIZE */ 2177 2178 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2179 /* Limit transfers to 32K, for xx400 & xx406 2180 * pseudoDMA that transfers in 128 bytes blocks. */ 2181 if (transfersize > 32 * 1024) 2182 transfersize = 32 * 1024; 2183 #endif 2184 len = transfersize; 2185 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2186 /* 2187 * If the watchdog timer fires, all future accesses to this 2188 * device will use the polled-IO. 2189 */ 2190 scmd_printk(KERN_INFO, cmd, 2191 "switching to slow handshake\n"); 2192 cmd->device->borken = 1; 2193 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2194 sink = 1; 2195 do_abort(instance); 2196 cmd->result = DID_ERROR << 16; 2197 cmd->scsi_done(cmd); 2198 /* XXX - need to source or sink data here, as appropriate */ 2199 } else 2200 cmd->SCp.this_residual -= transfersize - len; 2201 } else 2202 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2203 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2204 &cmd->SCp.ptr); 2205 break; 2206 case PHASE_MSGIN: 2207 len = 1; 2208 data = &tmp; 2209 NCR5380_transfer_pio(instance, &phase, &len, &data); 2210 cmd->SCp.Message = tmp; 2211 2212 switch (tmp) { 2213 /* 2214 * Linking lets us reduce the time required to get the 2215 * next command out to the device, hopefully this will 2216 * mean we don't waste another revolution due to the delays 2217 * required by ARBITRATION and another SELECTION. 2218 * 2219 * In the current implementation proposal, low level drivers 2220 * merely have to start the next command, pointed to by 2221 * next_link, done() is called as with unlinked commands. 2222 */ 2223 #ifdef LINKED 2224 case LINKED_CMD_COMPLETE: 2225 case LINKED_FLG_CMD_COMPLETE: 2226 /* Accept message by clearing ACK */ 2227 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2228 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2229 /* 2230 * Sanity check : A linked command should only terminate with 2231 * one of these messages if there are more linked commands 2232 * available. 2233 */ 2234 if (!cmd->next_link) { 2235 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2236 sink = 1; 2237 do_abort(instance); 2238 return; 2239 } 2240 initialize_SCp(cmd->next_link); 2241 /* The next command is still part of this process */ 2242 cmd->next_link->tag = cmd->tag; 2243 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2244 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2245 collect_stats(hostdata, cmd); 2246 cmd->scsi_done(cmd); 2247 cmd = hostdata->connected; 2248 break; 2249 #endif /* def LINKED */ 2250 case ABORT: 2251 case COMMAND_COMPLETE: 2252 /* Accept message by clearing ACK */ 2253 sink = 1; 2254 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2255 hostdata->connected = NULL; 2256 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2257 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2258 2259 /* 2260 * I'm not sure what the correct thing to do here is : 2261 * 2262 * If the command that just executed is NOT a request 2263 * sense, the obvious thing to do is to set the result 2264 * code to the values of the stored parameters. 2265 * 2266 * If it was a REQUEST SENSE command, we need some way 2267 * to differentiate between the failure code of the original 2268 * and the failure code of the REQUEST sense - the obvious 2269 * case is success, where we fall through and leave the result 2270 * code unchanged. 2271 * 2272 * The non-obvious place is where the REQUEST SENSE failed 2273 */ 2274 2275 if (cmd->cmnd[0] != REQUEST_SENSE) 2276 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2277 else if (status_byte(cmd->SCp.Status) != GOOD) 2278 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2279 2280 #ifdef AUTOSENSE 2281 if ((cmd->cmnd[0] == REQUEST_SENSE) && 2282 hostdata->ses.cmd_len) { 2283 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 2284 hostdata->ses.cmd_len = 0 ; 2285 } 2286 2287 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2288 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); 2289 2290 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2291 2292 LIST(cmd, hostdata->issue_queue); 2293 cmd->host_scribble = (unsigned char *) 2294 hostdata->issue_queue; 2295 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2296 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2297 } else 2298 #endif /* def AUTOSENSE */ 2299 { 2300 collect_stats(hostdata, cmd); 2301 cmd->scsi_done(cmd); 2302 } 2303 2304 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2305 /* 2306 * Restore phase bits to 0 so an interrupted selection, 2307 * arbitration can resume. 2308 */ 2309 NCR5380_write(TARGET_COMMAND_REG, 0); 2310 2311 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2312 barrier(); 2313 return; 2314 case MESSAGE_REJECT: 2315 /* Accept message by clearing ACK */ 2316 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2317 switch (hostdata->last_message) { 2318 case HEAD_OF_QUEUE_TAG: 2319 case ORDERED_QUEUE_TAG: 2320 case SIMPLE_QUEUE_TAG: 2321 cmd->device->simple_tags = 0; 2322 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2323 break; 2324 default: 2325 break; 2326 } 2327 case DISCONNECT:{ 2328 /* Accept message by clearing ACK */ 2329 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2330 cmd->device->disconnect = 1; 2331 LIST(cmd, hostdata->disconnected_queue); 2332 cmd->host_scribble = (unsigned char *) 2333 hostdata->disconnected_queue; 2334 hostdata->connected = NULL; 2335 hostdata->disconnected_queue = cmd; 2336 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)); 2337 /* 2338 * Restore phase bits to 0 so an interrupted selection, 2339 * arbitration can resume. 2340 */ 2341 NCR5380_write(TARGET_COMMAND_REG, 0); 2342 2343 /* Enable reselect interrupts */ 2344 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2345 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2346 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2347 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2348 barrier(); 2349 return; 2350 } 2351 /* 2352 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2353 * operation, in violation of the SCSI spec so we can safely 2354 * ignore SAVE/RESTORE pointers calls. 2355 * 2356 * Unfortunately, some disks violate the SCSI spec and 2357 * don't issue the required SAVE_POINTERS message before 2358 * disconnecting, and we have to break spec to remain 2359 * compatible. 2360 */ 2361 case SAVE_POINTERS: 2362 case RESTORE_POINTERS: 2363 /* Accept message by clearing ACK */ 2364 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2365 break; 2366 case EXTENDED_MESSAGE: 2367 /* 2368 * Extended messages are sent in the following format : 2369 * Byte 2370 * 0 EXTENDED_MESSAGE == 1 2371 * 1 length (includes one byte for code, doesn't 2372 * include first two bytes) 2373 * 2 code 2374 * 3..length+1 arguments 2375 * 2376 * Start the extended message buffer with the EXTENDED_MESSAGE 2377 * byte, since spi_print_msg() wants the whole thing. 2378 */ 2379 extended_msg[0] = EXTENDED_MESSAGE; 2380 /* Accept first byte by clearing ACK */ 2381 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2382 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2383 2384 len = 2; 2385 data = extended_msg + 1; 2386 phase = PHASE_MSGIN; 2387 NCR5380_transfer_pio(instance, &phase, &len, &data); 2388 2389 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2390 2391 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2392 /* Accept third byte by clearing ACK */ 2393 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2394 len = extended_msg[1] - 1; 2395 data = extended_msg + 3; 2396 phase = PHASE_MSGIN; 2397 2398 NCR5380_transfer_pio(instance, &phase, &len, &data); 2399 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2400 2401 switch (extended_msg[2]) { 2402 case EXTENDED_SDTR: 2403 case EXTENDED_WDTR: 2404 case EXTENDED_MODIFY_DATA_POINTER: 2405 case EXTENDED_EXTENDED_IDENTIFY: 2406 tmp = 0; 2407 } 2408 } else if (len) { 2409 printk("scsi%d: error receiving extended message\n", instance->host_no); 2410 tmp = 0; 2411 } else { 2412 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2413 tmp = 0; 2414 } 2415 /* Fall through to reject message */ 2416 2417 /* 2418 * If we get something weird that we aren't expecting, 2419 * reject it. 2420 */ 2421 default: 2422 if (!tmp) { 2423 printk("scsi%d: rejecting message ", instance->host_no); 2424 spi_print_msg(extended_msg); 2425 printk("\n"); 2426 } else if (tmp != EXTENDED_MESSAGE) 2427 scmd_printk(KERN_INFO, cmd, 2428 "rejecting unknown message %02x\n",tmp); 2429 else 2430 scmd_printk(KERN_INFO, cmd, 2431 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2432 2433 msgout = MESSAGE_REJECT; 2434 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2435 break; 2436 } /* switch (tmp) */ 2437 break; 2438 case PHASE_MSGOUT: 2439 len = 1; 2440 data = &msgout; 2441 hostdata->last_message = msgout; 2442 NCR5380_transfer_pio(instance, &phase, &len, &data); 2443 if (msgout == ABORT) { 2444 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2445 hostdata->connected = NULL; 2446 cmd->result = DID_ERROR << 16; 2447 collect_stats(hostdata, cmd); 2448 cmd->scsi_done(cmd); 2449 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2450 return; 2451 } 2452 msgout = NOP; 2453 break; 2454 case PHASE_CMDOUT: 2455 len = cmd->cmd_len; 2456 data = cmd->cmnd; 2457 /* 2458 * XXX for performance reasons, on machines with a 2459 * PSEUDO-DMA architecture we should probably 2460 * use the dma transfer function. 2461 */ 2462 NCR5380_transfer_pio(instance, &phase, &len, &data); 2463 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2464 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2465 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2466 return; 2467 } 2468 break; 2469 case PHASE_STATIN: 2470 len = 1; 2471 data = &tmp; 2472 NCR5380_transfer_pio(instance, &phase, &len, &data); 2473 cmd->SCp.Status = tmp; 2474 break; 2475 default: 2476 printk("scsi%d : unknown phase\n", instance->host_no); 2477 NCR5380_dprint(NDEBUG_ALL, instance); 2478 } /* switch(phase) */ 2479 } /* if (tmp * SR_REQ) */ 2480 else { 2481 /* RvC: go to sleep if polling time expired 2482 */ 2483 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2484 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2485 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2486 return; 2487 } 2488 } 2489 } /* while (1) */ 2490 } 2491 2492 /* 2493 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2494 * 2495 * Purpose : does reselection, initializing the instance->connected 2496 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2497 * nexus has been reestablished, 2498 * 2499 * Inputs : instance - this instance of the NCR5380. 2500 * 2501 * Locks: io_request_lock held by caller if IRQ driven 2502 */ 2503 2504 static void NCR5380_reselect(struct Scsi_Host *instance) { 2505 NCR5380_local_declare(); 2506 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2507 instance->hostdata; 2508 unsigned char target_mask; 2509 unsigned char lun, phase; 2510 int len; 2511 unsigned char msg[3]; 2512 unsigned char *data; 2513 Scsi_Cmnd *tmp = NULL, *prev; 2514 int abort = 0; 2515 NCR5380_setup(instance); 2516 2517 /* 2518 * Disable arbitration, etc. since the host adapter obviously 2519 * lost, and tell an interrupted NCR5380_select() to restart. 2520 */ 2521 2522 NCR5380_write(MODE_REG, MR_BASE); 2523 hostdata->restart_select = 1; 2524 2525 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2526 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); 2527 2528 /* 2529 * At this point, we have detected that our SCSI ID is on the bus, 2530 * SEL is true and BSY was false for at least one bus settle delay 2531 * (400 ns). 2532 * 2533 * We must assert BSY ourselves, until the target drops the SEL 2534 * signal. 2535 */ 2536 2537 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2538 2539 /* FIXME: timeout too long, must fail to workqueue */ 2540 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2541 abort = 1; 2542 2543 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2544 2545 /* 2546 * Wait for target to go into MSGIN. 2547 * FIXME: timeout needed and fail to work queeu 2548 */ 2549 2550 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2551 abort = 1; 2552 2553 len = 1; 2554 data = msg; 2555 phase = PHASE_MSGIN; 2556 NCR5380_transfer_pio(instance, &phase, &len, &data); 2557 2558 if (!(msg[0] & 0x80)) { 2559 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2560 spi_print_msg(msg); 2561 abort = 1; 2562 } else { 2563 /* Accept message by clearing ACK */ 2564 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2565 lun = (msg[0] & 0x07); 2566 2567 /* 2568 * We need to add code for SCSI-II to track which devices have 2569 * I_T_L_Q nexuses established, and which have simple I_T_L 2570 * nexuses so we can chose to do additional data transfer. 2571 */ 2572 2573 /* 2574 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2575 * just reestablished, and remove it from the disconnected queue. 2576 */ 2577 2578 2579 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2580 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2581 ) { 2582 if (prev) { 2583 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2584 prev->host_scribble = tmp->host_scribble; 2585 } else { 2586 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2587 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2588 } 2589 tmp->host_scribble = NULL; 2590 break; 2591 } 2592 if (!tmp) { 2593 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2594 /* 2595 * Since we have an established nexus that we can't do anything with, 2596 * we must abort it. 2597 */ 2598 abort = 1; 2599 } 2600 } 2601 2602 if (abort) { 2603 do_abort(instance); 2604 } else { 2605 hostdata->connected = tmp; 2606 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); 2607 } 2608 } 2609 2610 /* 2611 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2612 * 2613 * Purpose : called by interrupt handler when DMA finishes or a phase 2614 * mismatch occurs (which would finish the DMA transfer). 2615 * 2616 * Inputs : instance - this instance of the NCR5380. 2617 * 2618 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2619 * nexus has been reestablished, on failure NULL is returned. 2620 */ 2621 2622 #ifdef REAL_DMA 2623 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2624 NCR5380_local_declare(); 2625 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2626 int transferred; 2627 NCR5380_setup(instance); 2628 2629 /* 2630 * XXX this might not be right. 2631 * 2632 * Wait for final byte to transfer, ie wait for ACK to go false. 2633 * 2634 * We should use the Last Byte Sent bit, unfortunately this is 2635 * not available on the 5380/5381 (only the various CMOS chips) 2636 * 2637 * FIXME: timeout, and need to handle long timeout/irq case 2638 */ 2639 2640 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2641 2642 NCR5380_write(MODE_REG, MR_BASE); 2643 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2644 2645 /* 2646 * The only places we should see a phase mismatch and have to send 2647 * data from the same set of pointers will be the data transfer 2648 * phases. So, residual, requested length are only important here. 2649 */ 2650 2651 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2652 transferred = instance->dmalen - NCR5380_dma_residual(); 2653 hostdata->connected->SCp.this_residual -= transferred; 2654 hostdata->connected->SCp.ptr += transferred; 2655 } 2656 } 2657 #endif /* def REAL_DMA */ 2658 2659 /* 2660 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2661 * 2662 * Purpose : abort a command 2663 * 2664 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2665 * host byte of the result field to, if zero DID_ABORTED is 2666 * used. 2667 * 2668 * Returns : 0 - success, -1 on failure. 2669 * 2670 * XXX - there is no way to abort the command that is currently 2671 * connected, you have to wait for it to complete. If this is 2672 * a problem, we could implement longjmp() / setjmp(), setjmp() 2673 * called where the loop started in NCR5380_main(). 2674 * 2675 * Locks: host lock taken by caller 2676 */ 2677 2678 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2679 NCR5380_local_declare(); 2680 struct Scsi_Host *instance = cmd->device->host; 2681 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2682 Scsi_Cmnd *tmp, **prev; 2683 2684 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2685 scsi_print_command(cmd); 2686 2687 NCR5380_print_status(instance); 2688 2689 NCR5380_setup(instance); 2690 2691 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); 2692 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); 2693 2694 #if 0 2695 /* 2696 * Case 1 : If the command is the currently executing command, 2697 * we'll set the aborted flag and return control so that 2698 * information transfer routine can exit cleanly. 2699 */ 2700 2701 if (hostdata->connected == cmd) { 2702 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); 2703 hostdata->aborted = 1; 2704 /* 2705 * We should perform BSY checking, and make sure we haven't slipped 2706 * into BUS FREE. 2707 */ 2708 2709 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2710 /* 2711 * Since we can't change phases until we've completed the current 2712 * handshake, we have to source or sink a byte of data if the current 2713 * phase is not MSGOUT. 2714 */ 2715 2716 /* 2717 * Return control to the executing NCR drive so we can clear the 2718 * aborted flag and get back into our main loop. 2719 */ 2720 2721 return 0; 2722 } 2723 #endif 2724 2725 /* 2726 * Case 2 : If the command hasn't been issued yet, we simply remove it 2727 * from the issue queue. 2728 */ 2729 2730 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); 2731 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) 2732 if (cmd == tmp) { 2733 REMOVE(5, *prev, tmp, tmp->host_scribble); 2734 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2735 tmp->host_scribble = NULL; 2736 tmp->result = DID_ABORT << 16; 2737 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); 2738 tmp->scsi_done(tmp); 2739 return SUCCESS; 2740 } 2741 #if (NDEBUG & NDEBUG_ABORT) 2742 /* KLL */ 2743 else if (prev == tmp) 2744 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2745 #endif 2746 2747 /* 2748 * Case 3 : If any commands are connected, we're going to fail the abort 2749 * and let the high level SCSI driver retry at a later time or 2750 * issue a reset. 2751 * 2752 * Timeouts, and therefore aborted commands, will be highly unlikely 2753 * and handling them cleanly in this situation would make the common 2754 * case of noresets less efficient, and would pollute our code. So, 2755 * we fail. 2756 */ 2757 2758 if (hostdata->connected) { 2759 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); 2760 return FAILED; 2761 } 2762 /* 2763 * Case 4: If the command is currently disconnected from the bus, and 2764 * there are no connected commands, we reconnect the I_T_L or 2765 * I_T_L_Q nexus associated with it, go into message out, and send 2766 * an abort message. 2767 * 2768 * This case is especially ugly. In order to reestablish the nexus, we 2769 * need to call NCR5380_select(). The easiest way to implement this 2770 * function was to abort if the bus was busy, and let the interrupt 2771 * handler triggered on the SEL for reselect take care of lost arbitrations 2772 * where necessary, meaning interrupts need to be enabled. 2773 * 2774 * When interrupts are enabled, the queues may change - so we 2775 * can't remove it from the disconnected queue before selecting it 2776 * because that could cause a failure in hashing the nexus if that 2777 * device reselected. 2778 * 2779 * Since the queues may change, we can't use the pointers from when we 2780 * first locate it. 2781 * 2782 * So, we must first locate the command, and if NCR5380_select() 2783 * succeeds, then issue the abort, relocate the command and remove 2784 * it from the disconnected queue. 2785 */ 2786 2787 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2788 if (cmd == tmp) { 2789 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); 2790 2791 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2792 return FAILED; 2793 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); 2794 2795 do_abort(instance); 2796 2797 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) 2798 if (cmd == tmp) { 2799 REMOVE(5, *prev, tmp, tmp->host_scribble); 2800 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2801 tmp->host_scribble = NULL; 2802 tmp->result = DID_ABORT << 16; 2803 tmp->scsi_done(tmp); 2804 return SUCCESS; 2805 } 2806 } 2807 /* 2808 * Case 5 : If we reached this point, the command was not found in any of 2809 * the queues. 2810 * 2811 * We probably reached this point because of an unlikely race condition 2812 * between the command completing successfully and the abortion code, 2813 * so we won't panic, but we will notify the user in case something really 2814 * broke. 2815 */ 2816 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2817 " before abortion\n", instance->host_no); 2818 return FAILED; 2819 } 2820 2821 2822 /* 2823 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2824 * 2825 * Purpose : reset the SCSI bus. 2826 * 2827 * Returns : SUCCESS 2828 * 2829 * Locks: host lock taken by caller 2830 */ 2831 2832 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2833 { 2834 struct Scsi_Host *instance = cmd->device->host; 2835 2836 NCR5380_local_declare(); 2837 NCR5380_setup(instance); 2838 NCR5380_print_status(instance); 2839 2840 spin_lock_irq(instance->host_lock); 2841 do_reset(instance); 2842 spin_unlock_irq(instance->host_lock); 2843 2844 return SUCCESS; 2845 } 2846