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@lxorguk.ukuu.org.uk) 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 (scsi_bufflen(cmd)) { 299 cmd->SCp.buffer = scsi_sglist(cmd); 300 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; 301 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 302 cmd->SCp.this_residual = cmd->SCp.buffer->length; 303 } else { 304 cmd->SCp.buffer = NULL; 305 cmd->SCp.buffers_residual = 0; 306 cmd->SCp.ptr = NULL; 307 cmd->SCp.this_residual = 0; 308 } 309 } 310 311 /** 312 * NCR5380_poll_politely - wait for NCR5380 status bits 313 * @instance: controller to poll 314 * @reg: 5380 register to poll 315 * @bit: Bitmask to check 316 * @val: Value required to exit 317 * 318 * Polls the NCR5380 in a reasonably efficient manner waiting for 319 * an event to occur, after a short quick poll we begin giving the 320 * CPU back in non IRQ contexts 321 * 322 * Returns the value of the register or a negative error code. 323 */ 324 325 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) 326 { 327 NCR5380_local_declare(); 328 int n = 500; /* At about 8uS a cycle for the cpu access */ 329 unsigned long end = jiffies + t; 330 int r; 331 332 NCR5380_setup(instance); 333 334 while( n-- > 0) 335 { 336 r = NCR5380_read(reg); 337 if((r & bit) == val) 338 return 0; 339 cpu_relax(); 340 } 341 342 /* t time yet ? */ 343 while(time_before(jiffies, end)) 344 { 345 r = NCR5380_read(reg); 346 if((r & bit) == val) 347 return 0; 348 if(!in_interrupt()) 349 cond_resched(); 350 else 351 cpu_relax(); 352 } 353 return -ETIMEDOUT; 354 } 355 356 static struct { 357 unsigned char value; 358 const char *name; 359 } phases[] __maybe_unused = { 360 {PHASE_DATAOUT, "DATAOUT"}, 361 {PHASE_DATAIN, "DATAIN"}, 362 {PHASE_CMDOUT, "CMDOUT"}, 363 {PHASE_STATIN, "STATIN"}, 364 {PHASE_MSGOUT, "MSGOUT"}, 365 {PHASE_MSGIN, "MSGIN"}, 366 {PHASE_UNKNOWN, "UNKNOWN"} 367 }; 368 369 #if NDEBUG 370 static struct { 371 unsigned char mask; 372 const char *name; 373 } signals[] = { 374 {SR_DBP, "PARITY"}, 375 {SR_RST, "RST"}, 376 {SR_BSY, "BSY"}, 377 {SR_REQ, "REQ"}, 378 {SR_MSG, "MSG"}, 379 {SR_CD, "CD"}, 380 {SR_IO, "IO"}, 381 {SR_SEL, "SEL"}, 382 {0, NULL} 383 }, 384 basrs[] = { 385 {BASR_ATN, "ATN"}, 386 {BASR_ACK, "ACK"}, 387 {0, NULL} 388 }, 389 icrs[] = { 390 {ICR_ASSERT_RST, "ASSERT RST"}, 391 {ICR_ASSERT_ACK, "ASSERT ACK"}, 392 {ICR_ASSERT_BSY, "ASSERT BSY"}, 393 {ICR_ASSERT_SEL, "ASSERT SEL"}, 394 {ICR_ASSERT_ATN, "ASSERT ATN"}, 395 {ICR_ASSERT_DATA, "ASSERT DATA"}, 396 {0, NULL} 397 }, 398 mrs[] = { 399 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 400 {MR_TARGET, "MODE TARGET"}, 401 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 402 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 403 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 404 {MR_DMA_MODE, "MODE DMA"}, 405 {MR_ARBITRATE, "MODE ARBITRATION"}, 406 {0, NULL} 407 }; 408 409 /** 410 * NCR5380_print - print scsi bus signals 411 * @instance: adapter state to dump 412 * 413 * Print the SCSI bus signals for debugging purposes 414 * 415 * Locks: caller holds hostdata lock (not essential) 416 */ 417 418 static void NCR5380_print(struct Scsi_Host *instance) 419 { 420 NCR5380_local_declare(); 421 unsigned char status, data, basr, mr, icr, i; 422 NCR5380_setup(instance); 423 424 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 425 status = NCR5380_read(STATUS_REG); 426 mr = NCR5380_read(MODE_REG); 427 icr = NCR5380_read(INITIATOR_COMMAND_REG); 428 basr = NCR5380_read(BUS_AND_STATUS_REG); 429 430 printk("STATUS_REG: %02x ", status); 431 for (i = 0; signals[i].mask; ++i) 432 if (status & signals[i].mask) 433 printk(",%s", signals[i].name); 434 printk("\nBASR: %02x ", basr); 435 for (i = 0; basrs[i].mask; ++i) 436 if (basr & basrs[i].mask) 437 printk(",%s", basrs[i].name); 438 printk("\nICR: %02x ", icr); 439 for (i = 0; icrs[i].mask; ++i) 440 if (icr & icrs[i].mask) 441 printk(",%s", icrs[i].name); 442 printk("\nMODE: %02x ", mr); 443 for (i = 0; mrs[i].mask; ++i) 444 if (mr & mrs[i].mask) 445 printk(",%s", mrs[i].name); 446 printk("\n"); 447 } 448 449 450 /* 451 * NCR5380_print_phase - show SCSI phase 452 * @instance: adapter to dump 453 * 454 * Print the current SCSI phase for debugging purposes 455 * 456 * Locks: none 457 */ 458 459 static void NCR5380_print_phase(struct Scsi_Host *instance) 460 { 461 NCR5380_local_declare(); 462 unsigned char status; 463 int i; 464 NCR5380_setup(instance); 465 466 status = NCR5380_read(STATUS_REG); 467 if (!(status & SR_REQ)) 468 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); 469 else { 470 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); 471 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); 472 } 473 } 474 #endif 475 476 /* 477 * These need tweaking, and would probably work best as per-device 478 * flags initialized differently for disk, tape, cd, etc devices. 479 * People with broken devices are free to experiment as to what gives 480 * the best results for them. 481 * 482 * USLEEP_SLEEP should be a minimum seek time. 483 * 484 * USLEEP_POLL should be a maximum rotational latency. 485 */ 486 #ifndef USLEEP_SLEEP 487 /* 20 ms (reasonable hard disk speed) */ 488 #define USLEEP_SLEEP (20*HZ/1000) 489 #endif 490 /* 300 RPM (floppy speed) */ 491 #ifndef USLEEP_POLL 492 #define USLEEP_POLL (200*HZ/1000) 493 #endif 494 #ifndef USLEEP_WAITLONG 495 /* RvC: (reasonable time to wait on select error) */ 496 #define USLEEP_WAITLONG USLEEP_SLEEP 497 #endif 498 499 /* 500 * Function : int should_disconnect (unsigned char cmd) 501 * 502 * Purpose : decide whether a command would normally disconnect or 503 * not, since if it won't disconnect we should go to sleep. 504 * 505 * Input : cmd - opcode of SCSI command 506 * 507 * Returns : DISCONNECT_LONG if we should disconnect for a really long 508 * time (ie always, sleep, look for REQ active, sleep), 509 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal 510 * time-to-data delay, DISCONNECT_NONE if this command would return 511 * immediately. 512 * 513 * Future sleep algorithms based on time to data can exploit 514 * something like this so they can differentiate between "normal" 515 * (ie, read, write, seek) and unusual commands (ie, * format). 516 * 517 * Note : We don't deal with commands that handle an immediate disconnect, 518 * 519 */ 520 521 static int should_disconnect(unsigned char cmd) 522 { 523 switch (cmd) { 524 case READ_6: 525 case WRITE_6: 526 case SEEK_6: 527 case READ_10: 528 case WRITE_10: 529 case SEEK_10: 530 return DISCONNECT_TIME_TO_DATA; 531 case FORMAT_UNIT: 532 case SEARCH_HIGH: 533 case SEARCH_LOW: 534 case SEARCH_EQUAL: 535 return DISCONNECT_LONG; 536 default: 537 return DISCONNECT_NONE; 538 } 539 } 540 541 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) 542 { 543 hostdata->time_expires = jiffies + timeout; 544 schedule_delayed_work(&hostdata->coroutine, timeout); 545 } 546 547 548 static int probe_irq __initdata = 0; 549 550 /** 551 * probe_intr - helper for IRQ autoprobe 552 * @irq: interrupt number 553 * @dev_id: unused 554 * @regs: unused 555 * 556 * Set a flag to indicate the IRQ in question was received. This is 557 * used by the IRQ probe code. 558 */ 559 560 static irqreturn_t __init probe_intr(int irq, void *dev_id) 561 { 562 probe_irq = irq; 563 return IRQ_HANDLED; 564 } 565 566 /** 567 * NCR5380_probe_irq - find the IRQ of an NCR5380 568 * @instance: NCR5380 controller 569 * @possible: bitmask of ISA IRQ lines 570 * 571 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ 572 * and then looking to see what interrupt actually turned up. 573 * 574 * Locks: none, irqs must be enabled on entry 575 */ 576 577 static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, 578 int possible) 579 { 580 NCR5380_local_declare(); 581 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 582 unsigned long timeout; 583 int trying_irqs, i, mask; 584 NCR5380_setup(instance); 585 586 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) 587 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0)) 588 trying_irqs |= mask; 589 590 timeout = jiffies + (250 * HZ / 1000); 591 probe_irq = SCSI_IRQ_NONE; 592 593 /* 594 * A interrupt is triggered whenever BSY = false, SEL = true 595 * and a bit set in the SELECT_ENABLE_REG is asserted on the 596 * SCSI bus. 597 * 598 * Note that the bus is only driven when the phase control signals 599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 600 * to zero. 601 */ 602 603 NCR5380_write(TARGET_COMMAND_REG, 0); 604 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 605 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 607 608 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) 609 schedule_timeout_uninterruptible(1); 610 611 NCR5380_write(SELECT_ENABLE_REG, 0); 612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 613 614 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 615 if (trying_irqs & mask) 616 free_irq(i, NULL); 617 618 return probe_irq; 619 } 620 621 /** 622 * NCR58380_print_options - show options 623 * @instance: unused for now 624 * 625 * Called by probe code indicating the NCR5380 driver options that 626 * were selected. At some point this will switch to runtime options 627 * read from the adapter in question 628 * 629 * Locks: none 630 */ 631 632 static void __init __maybe_unused 633 NCR5380_print_options(struct Scsi_Host *instance) 634 { 635 printk(" generic options" 636 #ifdef AUTOPROBE_IRQ 637 " AUTOPROBE_IRQ" 638 #endif 639 #ifdef AUTOSENSE 640 " AUTOSENSE" 641 #endif 642 #ifdef DIFFERENTIAL 643 " DIFFERENTIAL" 644 #endif 645 #ifdef REAL_DMA 646 " REAL DMA" 647 #endif 648 #ifdef REAL_DMA_POLL 649 " REAL DMA POLL" 650 #endif 651 #ifdef PARITY 652 " PARITY" 653 #endif 654 #ifdef PSEUDO_DMA 655 " PSEUDO DMA" 656 #endif 657 #ifdef UNSAFE 658 " UNSAFE " 659 #endif 660 ); 661 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 662 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 663 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 664 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 665 } 666 } 667 668 /** 669 * NCR5380_print_status - dump controller info 670 * @instance: controller to dump 671 * 672 * Print commands in the various queues, called from NCR5380_abort 673 * and NCR5380_debug to aid debugging. 674 * 675 * Locks: called functions disable irqs 676 */ 677 678 static void NCR5380_print_status(struct Scsi_Host *instance) 679 { 680 NCR5380_dprint(NDEBUG_ANY, instance); 681 NCR5380_dprint_phase(NDEBUG_ANY, instance); 682 } 683 684 /******************************************/ 685 /* 686 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 687 * 688 * *buffer: I/O buffer 689 * **start: if inout == FALSE pointer into buffer where user read should start 690 * offset: current offset 691 * length: length of buffer 692 * hostno: Scsi_Host host_no 693 * inout: TRUE - user is writing; FALSE - user is reading 694 * 695 * Return the number of bytes read from or written 696 */ 697 698 #undef SPRINTF 699 #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) 700 static 701 char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); 702 static 703 char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); 704 static 705 char *lprint_opcode(int opcode, char *pos, char *buffer, int length); 706 707 static int __maybe_unused NCR5380_proc_info(struct Scsi_Host *instance, 708 char *buffer, char **start, off_t offset, int length, int inout) 709 { 710 char *pos = buffer; 711 struct NCR5380_hostdata *hostdata; 712 Scsi_Cmnd *ptr; 713 714 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 715 716 if (inout) { /* Has data been written to the file ? */ 717 #ifdef DTC_PUBLIC_RELEASE 718 dtc_wmaxi = dtc_maxi = 0; 719 #endif 720 #ifdef PAS16_PUBLIC_RELEASE 721 pas_wmaxi = pas_maxi = 0; 722 #endif 723 return (-ENOSYS); /* Currently this is a no-op */ 724 } 725 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 726 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 727 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 728 #ifdef DTC_PUBLIC_RELEASE 729 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 730 #endif 731 #ifdef T128_PUBLIC_RELEASE 732 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 733 #endif 734 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 735 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 736 #endif 737 #ifdef PAS16_PUBLIC_RELEASE 738 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 739 #endif 740 741 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 742 SPRINTF("io_port: %04x ", (int) instance->io_port); 743 if (instance->irq == SCSI_IRQ_NONE) 744 SPRINTF("IRQ: None.\n"); 745 else 746 SPRINTF("IRQ: %d.\n", instance->irq); 747 748 #ifdef DTC_PUBLIC_RELEASE 749 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 750 #endif 751 #ifdef PAS16_PUBLIC_RELEASE 752 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 753 #endif 754 spin_lock_irq(instance->host_lock); 755 if (!hostdata->connected) 756 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 757 else 758 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); 759 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 760 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 761 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 762 763 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 764 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 765 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 766 spin_unlock_irq(instance->host_lock); 767 768 *start = buffer; 769 if (pos - buffer < offset) 770 return 0; 771 else if (pos - buffer - offset < length) 772 return pos - buffer - offset; 773 return length; 774 } 775 776 static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) 777 { 778 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 779 SPRINTF(" command = "); 780 pos = lprint_command(cmd->cmnd, pos, buffer, length); 781 return (pos); 782 } 783 784 static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) 785 { 786 int i, s; 787 pos = lprint_opcode(command[0], pos, buffer, length); 788 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 789 SPRINTF("%02x ", command[i]); 790 SPRINTF("\n"); 791 return (pos); 792 } 793 794 static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) 795 { 796 SPRINTF("%2d (0x%02x)", opcode, opcode); 797 return (pos); 798 } 799 800 801 /** 802 * NCR5380_init - initialise an NCR5380 803 * @instance: adapter to configure 804 * @flags: control flags 805 * 806 * Initializes *instance and corresponding 5380 chip, 807 * with flags OR'd into the initial flags value. 808 * 809 * Notes : I assume that the host, hostno, and id bits have been 810 * set correctly. I don't care about the irq and other fields. 811 * 812 * Returns 0 for success 813 * 814 * Locks: interrupts must be enabled when we are called 815 */ 816 817 static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) 818 { 819 NCR5380_local_declare(); 820 int i, pass; 821 unsigned long timeout; 822 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 823 824 if(in_interrupt()) 825 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 826 /* 827 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 828 * the base address. 829 */ 830 831 #ifdef NCR53C400 832 if (flags & FLAG_NCR53C400) 833 instance->NCR5380_instance_name += NCR53C400_address_adjust; 834 #endif 835 836 NCR5380_setup(instance); 837 838 hostdata->aborted = 0; 839 hostdata->id_mask = 1 << instance->this_id; 840 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 841 if (i > hostdata->id_mask) 842 hostdata->id_higher_mask |= i; 843 for (i = 0; i < 8; ++i) 844 hostdata->busy[i] = 0; 845 #ifdef REAL_DMA 846 hostdata->dmalen = 0; 847 #endif 848 hostdata->targets_present = 0; 849 hostdata->connected = NULL; 850 hostdata->issue_queue = NULL; 851 hostdata->disconnected_queue = NULL; 852 853 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); 854 855 #ifdef NCR5380_STATS 856 for (i = 0; i < 8; ++i) { 857 hostdata->time_read[i] = 0; 858 hostdata->time_write[i] = 0; 859 hostdata->bytes_read[i] = 0; 860 hostdata->bytes_write[i] = 0; 861 } 862 hostdata->timebase = 0; 863 hostdata->pendingw = 0; 864 hostdata->pendingr = 0; 865 #endif 866 867 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 868 if (flags & FLAG_NCR53C400) 869 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 870 else 871 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 872 873 hostdata->host = instance; 874 hostdata->time_expires = 0; 875 876 #ifndef AUTOSENSE 877 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 878 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 879 " be incorrectly cleared.\n", instance->host_no); 880 #endif /* def AUTOSENSE */ 881 882 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 883 NCR5380_write(MODE_REG, MR_BASE); 884 NCR5380_write(TARGET_COMMAND_REG, 0); 885 NCR5380_write(SELECT_ENABLE_REG, 0); 886 887 #ifdef NCR53C400 888 if (hostdata->flags & FLAG_NCR53C400) { 889 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 890 } 891 #endif 892 893 /* 894 * Detect and correct bus wedge problems. 895 * 896 * If the system crashed, it may have crashed in a state 897 * where a SCSI command was still executing, and the 898 * SCSI bus is not in a BUS FREE STATE. 899 * 900 * If this is the case, we'll try to abort the currently 901 * established nexus which we know nothing about, and that 902 * failing, do a hard reset of the SCSI bus 903 */ 904 905 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 906 switch (pass) { 907 case 1: 908 case 3: 909 case 5: 910 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 911 timeout = jiffies + 5 * HZ; 912 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 913 break; 914 case 2: 915 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 916 do_abort(instance); 917 break; 918 case 4: 919 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 920 do_reset(instance); 921 break; 922 case 6: 923 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 924 return -ENXIO; 925 } 926 } 927 return 0; 928 } 929 930 /** 931 * NCR5380_exit - remove an NCR5380 932 * @instance: adapter to remove 933 */ 934 935 static void NCR5380_exit(struct Scsi_Host *instance) 936 { 937 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 938 939 cancel_delayed_work_sync(&hostdata->coroutine); 940 } 941 942 /** 943 * NCR5380_queue_command - queue a command 944 * @cmd: SCSI command 945 * @done: completion handler 946 * 947 * cmd is added to the per instance issue_queue, with minor 948 * twiddling done to the host specific fields of cmd. If the 949 * main coroutine is not running, it is restarted. 950 * 951 * Locks: host lock taken by caller 952 */ 953 954 static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 955 { 956 struct Scsi_Host *instance = cmd->device->host; 957 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 958 Scsi_Cmnd *tmp; 959 960 #if (NDEBUG & NDEBUG_NO_WRITE) 961 switch (cmd->cmnd[0]) { 962 case WRITE_6: 963 case WRITE_10: 964 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 965 cmd->result = (DID_ERROR << 16); 966 done(cmd); 967 return 0; 968 } 969 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 970 971 #ifdef NCR5380_STATS 972 switch (cmd->cmnd[0]) { 973 case WRITE: 974 case WRITE_6: 975 case WRITE_10: 976 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 977 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd); 978 hostdata->pendingw++; 979 break; 980 case READ: 981 case READ_6: 982 case READ_10: 983 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 984 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd); 985 hostdata->pendingr++; 986 break; 987 } 988 #endif 989 990 /* 991 * We use the host_scribble field as a pointer to the next command 992 * in a queue 993 */ 994 995 cmd->host_scribble = NULL; 996 cmd->scsi_done = done; 997 cmd->result = 0; 998 999 /* 1000 * Insert the cmd into the issue queue. Note that REQUEST SENSE 1001 * commands are added to the head of the queue since any command will 1002 * clear the contingent allegiance condition that exists and the 1003 * sense data is only guaranteed to be valid while the condition exists. 1004 */ 1005 1006 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1007 LIST(cmd, hostdata->issue_queue); 1008 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 1009 hostdata->issue_queue = cmd; 1010 } else { 1011 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 1012 LIST(cmd, tmp); 1013 tmp->host_scribble = (unsigned char *) cmd; 1014 } 1015 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); 1016 1017 /* Run the coroutine if it isn't already running. */ 1018 /* Kick off command processing */ 1019 schedule_delayed_work(&hostdata->coroutine, 0); 1020 return 0; 1021 } 1022 1023 static DEF_SCSI_QCMD(NCR5380_queue_command) 1024 1025 /** 1026 * NCR5380_main - NCR state machines 1027 * 1028 * NCR5380_main is a coroutine that runs as long as more work can 1029 * be done on the NCR5380 host adapters in a system. Both 1030 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1031 * in case it is not running. 1032 * 1033 * Locks: called as its own thread with no locks held. Takes the 1034 * host lock and called routines may take the isa dma lock. 1035 */ 1036 1037 static void NCR5380_main(struct work_struct *work) 1038 { 1039 struct NCR5380_hostdata *hostdata = 1040 container_of(work, struct NCR5380_hostdata, coroutine.work); 1041 struct Scsi_Host *instance = hostdata->host; 1042 Scsi_Cmnd *tmp, *prev; 1043 int done; 1044 1045 spin_lock_irq(instance->host_lock); 1046 do { 1047 /* Lock held here */ 1048 done = 1; 1049 if (!hostdata->connected && !hostdata->selecting) { 1050 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); 1051 /* 1052 * Search through the issue_queue for a command destined 1053 * for a target that's not busy. 1054 */ 1055 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1056 { 1057 if (prev != tmp) 1058 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); 1059 /* When we find one, remove it from the issue queue. */ 1060 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1061 if (prev) { 1062 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1063 prev->host_scribble = tmp->host_scribble; 1064 } else { 1065 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1066 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1067 } 1068 tmp->host_scribble = NULL; 1069 1070 /* 1071 * Attempt to establish an I_T_L nexus here. 1072 * On success, instance->hostdata->connected is set. 1073 * On failure, we must add the command back to the 1074 * issue queue so we can keep trying. 1075 */ 1076 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)); 1077 1078 /* 1079 * A successful selection is defined as one that 1080 * leaves us with the command connected and 1081 * in hostdata->connected, OR has terminated the 1082 * command. 1083 * 1084 * With successful commands, we fall through 1085 * and see if we can do an information transfer, 1086 * with failures we will restart. 1087 */ 1088 hostdata->selecting = NULL; 1089 /* RvC: have to preset this to indicate a new command is being performed */ 1090 1091 if (!NCR5380_select(instance, tmp, 1092 /* 1093 * REQUEST SENSE commands are issued without tagged 1094 * queueing, even on SCSI-II devices because the 1095 * contingent allegiance condition exists for the 1096 * entire unit. 1097 */ 1098 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1099 break; 1100 } else { 1101 LIST(tmp, hostdata->issue_queue); 1102 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1103 hostdata->issue_queue = tmp; 1104 done = 0; 1105 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); 1106 } 1107 /* lock held here still */ 1108 } /* if target/lun is not busy */ 1109 } /* for */ 1110 /* exited locked */ 1111 } /* if (!hostdata->connected) */ 1112 if (hostdata->selecting) { 1113 tmp = (Scsi_Cmnd *) hostdata->selecting; 1114 /* Selection will drop and retake the lock */ 1115 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1116 /* Ok ?? */ 1117 } else { 1118 /* RvC: device failed, so we wait a long time 1119 this is needed for Mustek scanners, that 1120 do not respond to commands immediately 1121 after a scan */ 1122 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1123 LIST(tmp, hostdata->issue_queue); 1124 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1125 hostdata->issue_queue = tmp; 1126 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1127 } 1128 } /* if hostdata->selecting */ 1129 if (hostdata->connected 1130 #ifdef REAL_DMA 1131 && !hostdata->dmalen 1132 #endif 1133 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1134 ) { 1135 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); 1136 NCR5380_information_transfer(instance); 1137 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); 1138 done = 0; 1139 } else 1140 break; 1141 } while (!done); 1142 1143 spin_unlock_irq(instance->host_lock); 1144 } 1145 1146 #ifndef DONT_USE_INTR 1147 1148 /** 1149 * NCR5380_intr - generic NCR5380 irq handler 1150 * @irq: interrupt number 1151 * @dev_id: device info 1152 * 1153 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1154 * from the disconnected queue, and restarting NCR5380_main() 1155 * as required. 1156 * 1157 * Locks: takes the needed instance locks 1158 */ 1159 1160 static irqreturn_t NCR5380_intr(int dummy, void *dev_id) 1161 { 1162 NCR5380_local_declare(); 1163 struct Scsi_Host *instance = dev_id; 1164 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1165 int done; 1166 unsigned char basr; 1167 unsigned long flags; 1168 1169 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", 1170 instance->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 transferred; 1202 1203 if (!hostdata->connected) 1204 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1205 1206 transferred = (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 transferred 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 transferred 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 | 1861 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | 1862 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1863 else 1864 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1865 #endif /* def REAL_DMA */ 1866 1867 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1868 1869 /* 1870 * On the PAS16 at least I/O recovery delays are not needed here. 1871 * Everyone else seems to want them. 1872 */ 1873 1874 if (p & SR_IO) { 1875 io_recovery_delay(1); 1876 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1877 } else { 1878 io_recovery_delay(1); 1879 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1880 io_recovery_delay(1); 1881 NCR5380_write(START_DMA_SEND_REG, 0); 1882 io_recovery_delay(1); 1883 } 1884 1885 #if defined(REAL_DMA_POLL) 1886 do { 1887 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1888 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1889 1890 /* 1891 At this point, either we've completed DMA, or we have a phase mismatch, 1892 or we've unexpectedly lost BUSY (which is a real error). 1893 1894 For write DMAs, we want to wait until the last byte has been 1895 transferred out over the bus before we turn off DMA mode. Alas, there 1896 seems to be no terribly good way of doing this on a 5380 under all 1897 conditions. For non-scatter-gather operations, we can wait until REQ 1898 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1899 are nastier, since the device will be expecting more data than we 1900 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1901 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1902 why this signal was added to the newer chips) but on the older 538[01] 1903 this signal does not exist. The workaround for this lack is a watchdog; 1904 we bail out of the wait-loop after a modest amount of wait-time if 1905 the usual exit conditions are not met. Not a terribly clean or 1906 correct solution :-% 1907 1908 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1909 If the chip is in DMA mode for an READ, it will respond to a target's 1910 REQ by latching the SCSI data into the INPUT DATA register and asserting 1911 ACK, even if it has _already_ been notified by the DMA controller that 1912 the current DMA transfer has completed! If the NCR5380 is then taken 1913 out of DMA mode, this already-acknowledged byte is lost. 1914 1915 This is not a problem for "one DMA transfer per command" reads, because 1916 the situation will never arise... either all of the data is DMA'ed 1917 properly, or the target switches to MESSAGE IN phase to signal a 1918 disconnection (either operation bringing the DMA to a clean halt). 1919 However, in order to handle scatter-reads, we must work around the 1920 problem. The chosen fix is to DMA N-2 bytes, then check for the 1921 condition before taking the NCR5380 out of DMA mode. One or two extra 1922 bytes are transferred via PIO as necessary to fill out the original 1923 request. 1924 */ 1925 1926 if (p & SR_IO) { 1927 #ifdef READ_OVERRUNS 1928 udelay(10); 1929 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1930 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1931 overrun = 1; 1932 } 1933 #endif 1934 } else { 1935 int limit = 100; 1936 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1937 if (!(tmp & BASR_PHASE_MATCH)) 1938 break; 1939 if (--limit < 0) 1940 break; 1941 } 1942 } 1943 1944 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1945 1946 NCR5380_write(MODE_REG, MR_BASE); 1947 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1948 1949 residue = NCR5380_dma_residual(instance); 1950 c -= residue; 1951 *count -= c; 1952 *data += c; 1953 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1954 1955 #ifdef READ_OVERRUNS 1956 if (*phase == p && (p & SR_IO) && residue == 0) { 1957 if (overrun) { 1958 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1959 **data = saved_data; 1960 *data += 1; 1961 *count -= 1; 1962 cnt = toPIO = 1; 1963 } else { 1964 printk("No overrun??\n"); 1965 cnt = toPIO = 2; 1966 } 1967 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1968 NCR5380_transfer_pio(instance, phase, &cnt, data); 1969 *count -= toPIO - cnt; 1970 } 1971 #endif 1972 1973 dprintk(NDEBUG_DMA, ("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count))); 1974 return 0; 1975 1976 #elif defined(REAL_DMA) 1977 return 0; 1978 #else /* defined(REAL_DMA_POLL) */ 1979 if (p & SR_IO) { 1980 #ifdef DMA_WORKS_RIGHT 1981 foo = NCR5380_pread(instance, d, c); 1982 #else 1983 int diff = 1; 1984 if (hostdata->flags & FLAG_NCR53C400) { 1985 diff = 0; 1986 } 1987 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1988 /* 1989 * We can't disable DMA mode after successfully transferring 1990 * what we plan to be the last byte, since that would open up 1991 * a race condition where if the target asserted REQ before 1992 * we got the DMA mode reset, the NCR5380 would have latched 1993 * an additional byte into the INPUT DATA register and we'd 1994 * have dropped it. 1995 * 1996 * The workaround was to transfer one fewer bytes than we 1997 * intended to with the pseudo-DMA read function, wait for 1998 * the chip to latch the last byte, read it, and then disable 1999 * pseudo-DMA mode. 2000 * 2001 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 2002 * REQ is deasserted when ACK is asserted, and not reasserted 2003 * until ACK goes false. Since the NCR5380 won't lower ACK 2004 * until DACK is asserted, which won't happen unless we twiddle 2005 * the DMA port or we take the NCR5380 out of DMA mode, we 2006 * can guarantee that we won't handshake another extra 2007 * byte. 2008 */ 2009 2010 if (!(hostdata->flags & FLAG_NCR53C400)) { 2011 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2012 /* Wait for clean handshake */ 2013 while (NCR5380_read(STATUS_REG) & SR_REQ); 2014 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2015 } 2016 } 2017 #endif 2018 } else { 2019 #ifdef DMA_WORKS_RIGHT 2020 foo = NCR5380_pwrite(instance, d, c); 2021 #else 2022 int timeout; 2023 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2024 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2025 /* 2026 * Wait for the last byte to be sent. If REQ is being asserted for 2027 * the byte we're interested, we'll ACK it and it will go false. 2028 */ 2029 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2030 timeout = 20000; 2031 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2032 2033 if (!timeout) 2034 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2035 2036 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2037 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2038 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2039 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2040 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2041 } 2042 } 2043 } else { 2044 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2045 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2046 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2047 } 2048 } 2049 #endif 2050 } 2051 NCR5380_write(MODE_REG, MR_BASE); 2052 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2053 2054 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2055 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2056 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2057 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2058 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2059 } else { 2060 printk("53C400w: IRQ NOT THERE!\n"); 2061 } 2062 } 2063 *data = d + c; 2064 *count = 0; 2065 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2066 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2067 spin_lock_irq(instance->host_lock); 2068 #endif /* defined(REAL_DMA_POLL) */ 2069 return foo; 2070 #endif /* def REAL_DMA */ 2071 } 2072 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2073 2074 /* 2075 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2076 * 2077 * Purpose : run through the various SCSI phases and do as the target 2078 * directs us to. Operates on the currently connected command, 2079 * instance->connected. 2080 * 2081 * Inputs : instance, instance for which we are doing commands 2082 * 2083 * Side effects : SCSI things happen, the disconnected queue will be 2084 * modified if a command disconnects, *instance->connected will 2085 * change. 2086 * 2087 * XXX Note : we need to watch for bus free or a reset condition here 2088 * to recover from an unexpected bus free condition. 2089 * 2090 * Locks: io_request_lock held by caller in IRQ mode 2091 */ 2092 2093 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2094 NCR5380_local_declare(); 2095 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2096 unsigned char msgout = NOP; 2097 int sink = 0; 2098 int len; 2099 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2100 int transfersize; 2101 #endif 2102 unsigned char *data; 2103 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2104 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2105 /* RvC: we need to set the end of the polling time */ 2106 unsigned long poll_time = jiffies + USLEEP_POLL; 2107 2108 NCR5380_setup(instance); 2109 2110 while (1) { 2111 tmp = NCR5380_read(STATUS_REG); 2112 /* We only have a valid SCSI phase when REQ is asserted */ 2113 if (tmp & SR_REQ) { 2114 phase = (tmp & PHASE_MASK); 2115 if (phase != old_phase) { 2116 old_phase = phase; 2117 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2118 } 2119 if (sink && (phase != PHASE_MSGOUT)) { 2120 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2121 2122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2123 while (NCR5380_read(STATUS_REG) & SR_REQ); 2124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2125 sink = 0; 2126 continue; 2127 } 2128 switch (phase) { 2129 case PHASE_DATAIN: 2130 case PHASE_DATAOUT: 2131 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2132 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2133 sink = 1; 2134 do_abort(instance); 2135 cmd->result = DID_ERROR << 16; 2136 cmd->scsi_done(cmd); 2137 return; 2138 #endif 2139 /* 2140 * If there is no room left in the current buffer in the 2141 * scatter-gather list, move onto the next one. 2142 */ 2143 2144 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2145 ++cmd->SCp.buffer; 2146 --cmd->SCp.buffers_residual; 2147 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2148 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 2149 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2150 } 2151 /* 2152 * The preferred transfer method is going to be 2153 * PSEUDO-DMA for systems that are strictly PIO, 2154 * since we can let the hardware do the handshaking. 2155 * 2156 * For this to work, we need to know the transfersize 2157 * ahead of time, since the pseudo-DMA code will sit 2158 * in an unconditional loop. 2159 */ 2160 2161 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2162 /* KLL 2163 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2164 * driver then it will always be defined, so the 2165 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2166 * NCR5380 case. I think this is a fairly clean solution. 2167 * We supplement these 2 if's with the flag. 2168 */ 2169 #ifdef NCR5380_dma_xfer_len 2170 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2171 #else 2172 transfersize = cmd->transfersize; 2173 2174 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2175 if (transfersize > 512) 2176 transfersize = 512; 2177 #endif /* LIMIT_TRANSFERSIZE */ 2178 2179 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2180 /* Limit transfers to 32K, for xx400 & xx406 2181 * pseudoDMA that transfers in 128 bytes blocks. */ 2182 if (transfersize > 32 * 1024) 2183 transfersize = 32 * 1024; 2184 #endif 2185 len = transfersize; 2186 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2187 /* 2188 * If the watchdog timer fires, all future accesses to this 2189 * device will use the polled-IO. 2190 */ 2191 scmd_printk(KERN_INFO, cmd, 2192 "switching to slow handshake\n"); 2193 cmd->device->borken = 1; 2194 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2195 sink = 1; 2196 do_abort(instance); 2197 cmd->result = DID_ERROR << 16; 2198 cmd->scsi_done(cmd); 2199 /* XXX - need to source or sink data here, as appropriate */ 2200 } else 2201 cmd->SCp.this_residual -= transfersize - len; 2202 } else 2203 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2204 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2205 &cmd->SCp.ptr); 2206 break; 2207 case PHASE_MSGIN: 2208 len = 1; 2209 data = &tmp; 2210 NCR5380_transfer_pio(instance, &phase, &len, &data); 2211 cmd->SCp.Message = tmp; 2212 2213 switch (tmp) { 2214 /* 2215 * Linking lets us reduce the time required to get the 2216 * next command out to the device, hopefully this will 2217 * mean we don't waste another revolution due to the delays 2218 * required by ARBITRATION and another SELECTION. 2219 * 2220 * In the current implementation proposal, low level drivers 2221 * merely have to start the next command, pointed to by 2222 * next_link, done() is called as with unlinked commands. 2223 */ 2224 #ifdef LINKED 2225 case LINKED_CMD_COMPLETE: 2226 case LINKED_FLG_CMD_COMPLETE: 2227 /* Accept message by clearing ACK */ 2228 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2229 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2230 /* 2231 * Sanity check : A linked command should only terminate with 2232 * one of these messages if there are more linked commands 2233 * available. 2234 */ 2235 if (!cmd->next_link) { 2236 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2237 sink = 1; 2238 do_abort(instance); 2239 return; 2240 } 2241 initialize_SCp(cmd->next_link); 2242 /* The next command is still part of this process */ 2243 cmd->next_link->tag = cmd->tag; 2244 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2245 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)); 2246 collect_stats(hostdata, cmd); 2247 cmd->scsi_done(cmd); 2248 cmd = hostdata->connected; 2249 break; 2250 #endif /* def LINKED */ 2251 case ABORT: 2252 case COMMAND_COMPLETE: 2253 /* Accept message by clearing ACK */ 2254 sink = 1; 2255 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2256 hostdata->connected = NULL; 2257 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2258 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2259 2260 /* 2261 * I'm not sure what the correct thing to do here is : 2262 * 2263 * If the command that just executed is NOT a request 2264 * sense, the obvious thing to do is to set the result 2265 * code to the values of the stored parameters. 2266 * 2267 * If it was a REQUEST SENSE command, we need some way 2268 * to differentiate between the failure code of the original 2269 * and the failure code of the REQUEST sense - the obvious 2270 * case is success, where we fall through and leave the result 2271 * code unchanged. 2272 * 2273 * The non-obvious place is where the REQUEST SENSE failed 2274 */ 2275 2276 if (cmd->cmnd[0] != REQUEST_SENSE) 2277 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2278 else if (status_byte(cmd->SCp.Status) != GOOD) 2279 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2280 2281 #ifdef AUTOSENSE 2282 if ((cmd->cmnd[0] == REQUEST_SENSE) && 2283 hostdata->ses.cmd_len) { 2284 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 2285 hostdata->ses.cmd_len = 0 ; 2286 } 2287 2288 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2289 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); 2290 2291 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2292 2293 LIST(cmd, hostdata->issue_queue); 2294 cmd->host_scribble = (unsigned char *) 2295 hostdata->issue_queue; 2296 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2297 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2298 } else 2299 #endif /* def AUTOSENSE */ 2300 { 2301 collect_stats(hostdata, cmd); 2302 cmd->scsi_done(cmd); 2303 } 2304 2305 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2306 /* 2307 * Restore phase bits to 0 so an interrupted selection, 2308 * arbitration can resume. 2309 */ 2310 NCR5380_write(TARGET_COMMAND_REG, 0); 2311 2312 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2313 barrier(); 2314 return; 2315 case MESSAGE_REJECT: 2316 /* Accept message by clearing ACK */ 2317 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2318 switch (hostdata->last_message) { 2319 case HEAD_OF_QUEUE_TAG: 2320 case ORDERED_QUEUE_TAG: 2321 case SIMPLE_QUEUE_TAG: 2322 cmd->device->simple_tags = 0; 2323 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2324 break; 2325 default: 2326 break; 2327 } 2328 case DISCONNECT:{ 2329 /* Accept message by clearing ACK */ 2330 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2331 cmd->device->disconnect = 1; 2332 LIST(cmd, hostdata->disconnected_queue); 2333 cmd->host_scribble = (unsigned char *) 2334 hostdata->disconnected_queue; 2335 hostdata->connected = NULL; 2336 hostdata->disconnected_queue = cmd; 2337 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)); 2338 /* 2339 * Restore phase bits to 0 so an interrupted selection, 2340 * arbitration can resume. 2341 */ 2342 NCR5380_write(TARGET_COMMAND_REG, 0); 2343 2344 /* Enable reselect interrupts */ 2345 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2346 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2347 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2348 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2349 barrier(); 2350 return; 2351 } 2352 /* 2353 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2354 * operation, in violation of the SCSI spec so we can safely 2355 * ignore SAVE/RESTORE pointers calls. 2356 * 2357 * Unfortunately, some disks violate the SCSI spec and 2358 * don't issue the required SAVE_POINTERS message before 2359 * disconnecting, and we have to break spec to remain 2360 * compatible. 2361 */ 2362 case SAVE_POINTERS: 2363 case RESTORE_POINTERS: 2364 /* Accept message by clearing ACK */ 2365 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2366 break; 2367 case EXTENDED_MESSAGE: 2368 /* 2369 * Extended messages are sent in the following format : 2370 * Byte 2371 * 0 EXTENDED_MESSAGE == 1 2372 * 1 length (includes one byte for code, doesn't 2373 * include first two bytes) 2374 * 2 code 2375 * 3..length+1 arguments 2376 * 2377 * Start the extended message buffer with the EXTENDED_MESSAGE 2378 * byte, since spi_print_msg() wants the whole thing. 2379 */ 2380 extended_msg[0] = EXTENDED_MESSAGE; 2381 /* Accept first byte by clearing ACK */ 2382 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2383 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2384 2385 len = 2; 2386 data = extended_msg + 1; 2387 phase = PHASE_MSGIN; 2388 NCR5380_transfer_pio(instance, &phase, &len, &data); 2389 2390 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2391 2392 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2393 /* Accept third byte by clearing ACK */ 2394 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2395 len = extended_msg[1] - 1; 2396 data = extended_msg + 3; 2397 phase = PHASE_MSGIN; 2398 2399 NCR5380_transfer_pio(instance, &phase, &len, &data); 2400 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2401 2402 switch (extended_msg[2]) { 2403 case EXTENDED_SDTR: 2404 case EXTENDED_WDTR: 2405 case EXTENDED_MODIFY_DATA_POINTER: 2406 case EXTENDED_EXTENDED_IDENTIFY: 2407 tmp = 0; 2408 } 2409 } else if (len) { 2410 printk("scsi%d: error receiving extended message\n", instance->host_no); 2411 tmp = 0; 2412 } else { 2413 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2414 tmp = 0; 2415 } 2416 /* Fall through to reject message */ 2417 2418 /* 2419 * If we get something weird that we aren't expecting, 2420 * reject it. 2421 */ 2422 default: 2423 if (!tmp) { 2424 printk("scsi%d: rejecting message ", instance->host_no); 2425 spi_print_msg(extended_msg); 2426 printk("\n"); 2427 } else if (tmp != EXTENDED_MESSAGE) 2428 scmd_printk(KERN_INFO, cmd, 2429 "rejecting unknown message %02x\n",tmp); 2430 else 2431 scmd_printk(KERN_INFO, cmd, 2432 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2433 2434 msgout = MESSAGE_REJECT; 2435 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2436 break; 2437 } /* switch (tmp) */ 2438 break; 2439 case PHASE_MSGOUT: 2440 len = 1; 2441 data = &msgout; 2442 hostdata->last_message = msgout; 2443 NCR5380_transfer_pio(instance, &phase, &len, &data); 2444 if (msgout == ABORT) { 2445 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2446 hostdata->connected = NULL; 2447 cmd->result = DID_ERROR << 16; 2448 collect_stats(hostdata, cmd); 2449 cmd->scsi_done(cmd); 2450 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2451 return; 2452 } 2453 msgout = NOP; 2454 break; 2455 case PHASE_CMDOUT: 2456 len = cmd->cmd_len; 2457 data = cmd->cmnd; 2458 /* 2459 * XXX for performance reasons, on machines with a 2460 * PSEUDO-DMA architecture we should probably 2461 * use the dma transfer function. 2462 */ 2463 NCR5380_transfer_pio(instance, &phase, &len, &data); 2464 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2465 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2466 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2467 return; 2468 } 2469 break; 2470 case PHASE_STATIN: 2471 len = 1; 2472 data = &tmp; 2473 NCR5380_transfer_pio(instance, &phase, &len, &data); 2474 cmd->SCp.Status = tmp; 2475 break; 2476 default: 2477 printk("scsi%d : unknown phase\n", instance->host_no); 2478 NCR5380_dprint(NDEBUG_ALL, instance); 2479 } /* switch(phase) */ 2480 } /* if (tmp * SR_REQ) */ 2481 else { 2482 /* RvC: go to sleep if polling time expired 2483 */ 2484 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2485 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2486 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2487 return; 2488 } 2489 } 2490 } /* while (1) */ 2491 } 2492 2493 /* 2494 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2495 * 2496 * Purpose : does reselection, initializing the instance->connected 2497 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2498 * nexus has been reestablished, 2499 * 2500 * Inputs : instance - this instance of the NCR5380. 2501 * 2502 * Locks: io_request_lock held by caller if IRQ driven 2503 */ 2504 2505 static void NCR5380_reselect(struct Scsi_Host *instance) { 2506 NCR5380_local_declare(); 2507 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2508 instance->hostdata; 2509 unsigned char target_mask; 2510 unsigned char lun, phase; 2511 int len; 2512 unsigned char msg[3]; 2513 unsigned char *data; 2514 Scsi_Cmnd *tmp = NULL, *prev; 2515 int abort = 0; 2516 NCR5380_setup(instance); 2517 2518 /* 2519 * Disable arbitration, etc. since the host adapter obviously 2520 * lost, and tell an interrupted NCR5380_select() to restart. 2521 */ 2522 2523 NCR5380_write(MODE_REG, MR_BASE); 2524 hostdata->restart_select = 1; 2525 2526 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2527 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); 2528 2529 /* 2530 * At this point, we have detected that our SCSI ID is on the bus, 2531 * SEL is true and BSY was false for at least one bus settle delay 2532 * (400 ns). 2533 * 2534 * We must assert BSY ourselves, until the target drops the SEL 2535 * signal. 2536 */ 2537 2538 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2539 2540 /* FIXME: timeout too long, must fail to workqueue */ 2541 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2542 abort = 1; 2543 2544 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2545 2546 /* 2547 * Wait for target to go into MSGIN. 2548 * FIXME: timeout needed and fail to work queeu 2549 */ 2550 2551 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2552 abort = 1; 2553 2554 len = 1; 2555 data = msg; 2556 phase = PHASE_MSGIN; 2557 NCR5380_transfer_pio(instance, &phase, &len, &data); 2558 2559 if (!(msg[0] & 0x80)) { 2560 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2561 spi_print_msg(msg); 2562 abort = 1; 2563 } else { 2564 /* Accept message by clearing ACK */ 2565 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2566 lun = (msg[0] & 0x07); 2567 2568 /* 2569 * We need to add code for SCSI-II to track which devices have 2570 * I_T_L_Q nexuses established, and which have simple I_T_L 2571 * nexuses so we can chose to do additional data transfer. 2572 */ 2573 2574 /* 2575 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2576 * just reestablished, and remove it from the disconnected queue. 2577 */ 2578 2579 2580 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2581 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2582 ) { 2583 if (prev) { 2584 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2585 prev->host_scribble = tmp->host_scribble; 2586 } else { 2587 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2588 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2589 } 2590 tmp->host_scribble = NULL; 2591 break; 2592 } 2593 if (!tmp) { 2594 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2595 /* 2596 * Since we have an established nexus that we can't do anything with, 2597 * we must abort it. 2598 */ 2599 abort = 1; 2600 } 2601 } 2602 2603 if (abort) { 2604 do_abort(instance); 2605 } else { 2606 hostdata->connected = tmp; 2607 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); 2608 } 2609 } 2610 2611 /* 2612 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2613 * 2614 * Purpose : called by interrupt handler when DMA finishes or a phase 2615 * mismatch occurs (which would finish the DMA transfer). 2616 * 2617 * Inputs : instance - this instance of the NCR5380. 2618 * 2619 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2620 * nexus has been reestablished, on failure NULL is returned. 2621 */ 2622 2623 #ifdef REAL_DMA 2624 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2625 NCR5380_local_declare(); 2626 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2627 int transferred; 2628 NCR5380_setup(instance); 2629 2630 /* 2631 * XXX this might not be right. 2632 * 2633 * Wait for final byte to transfer, ie wait for ACK to go false. 2634 * 2635 * We should use the Last Byte Sent bit, unfortunately this is 2636 * not available on the 5380/5381 (only the various CMOS chips) 2637 * 2638 * FIXME: timeout, and need to handle long timeout/irq case 2639 */ 2640 2641 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2642 2643 NCR5380_write(MODE_REG, MR_BASE); 2644 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2645 2646 /* 2647 * The only places we should see a phase mismatch and have to send 2648 * data from the same set of pointers will be the data transfer 2649 * phases. So, residual, requested length are only important here. 2650 */ 2651 2652 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2653 transferred = instance->dmalen - NCR5380_dma_residual(); 2654 hostdata->connected->SCp.this_residual -= transferred; 2655 hostdata->connected->SCp.ptr += transferred; 2656 } 2657 } 2658 #endif /* def REAL_DMA */ 2659 2660 /* 2661 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2662 * 2663 * Purpose : abort a command 2664 * 2665 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2666 * host byte of the result field to, if zero DID_ABORTED is 2667 * used. 2668 * 2669 * Returns : 0 - success, -1 on failure. 2670 * 2671 * XXX - there is no way to abort the command that is currently 2672 * connected, you have to wait for it to complete. If this is 2673 * a problem, we could implement longjmp() / setjmp(), setjmp() 2674 * called where the loop started in NCR5380_main(). 2675 * 2676 * Locks: host lock taken by caller 2677 */ 2678 2679 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2680 NCR5380_local_declare(); 2681 struct Scsi_Host *instance = cmd->device->host; 2682 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2683 Scsi_Cmnd *tmp, **prev; 2684 2685 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2686 scsi_print_command(cmd); 2687 2688 NCR5380_print_status(instance); 2689 2690 NCR5380_setup(instance); 2691 2692 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); 2693 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); 2694 2695 #if 0 2696 /* 2697 * Case 1 : If the command is the currently executing command, 2698 * we'll set the aborted flag and return control so that 2699 * information transfer routine can exit cleanly. 2700 */ 2701 2702 if (hostdata->connected == cmd) { 2703 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); 2704 hostdata->aborted = 1; 2705 /* 2706 * We should perform BSY checking, and make sure we haven't slipped 2707 * into BUS FREE. 2708 */ 2709 2710 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2711 /* 2712 * Since we can't change phases until we've completed the current 2713 * handshake, we have to source or sink a byte of data if the current 2714 * phase is not MSGOUT. 2715 */ 2716 2717 /* 2718 * Return control to the executing NCR drive so we can clear the 2719 * aborted flag and get back into our main loop. 2720 */ 2721 2722 return 0; 2723 } 2724 #endif 2725 2726 /* 2727 * Case 2 : If the command hasn't been issued yet, we simply remove it 2728 * from the issue queue. 2729 */ 2730 2731 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); 2732 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) 2733 if (cmd == tmp) { 2734 REMOVE(5, *prev, tmp, tmp->host_scribble); 2735 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2736 tmp->host_scribble = NULL; 2737 tmp->result = DID_ABORT << 16; 2738 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); 2739 tmp->scsi_done(tmp); 2740 return SUCCESS; 2741 } 2742 #if (NDEBUG & NDEBUG_ABORT) 2743 /* KLL */ 2744 else if (prev == tmp) 2745 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2746 #endif 2747 2748 /* 2749 * Case 3 : If any commands are connected, we're going to fail the abort 2750 * and let the high level SCSI driver retry at a later time or 2751 * issue a reset. 2752 * 2753 * Timeouts, and therefore aborted commands, will be highly unlikely 2754 * and handling them cleanly in this situation would make the common 2755 * case of noresets less efficient, and would pollute our code. So, 2756 * we fail. 2757 */ 2758 2759 if (hostdata->connected) { 2760 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); 2761 return FAILED; 2762 } 2763 /* 2764 * Case 4: If the command is currently disconnected from the bus, and 2765 * there are no connected commands, we reconnect the I_T_L or 2766 * I_T_L_Q nexus associated with it, go into message out, and send 2767 * an abort message. 2768 * 2769 * This case is especially ugly. In order to reestablish the nexus, we 2770 * need to call NCR5380_select(). The easiest way to implement this 2771 * function was to abort if the bus was busy, and let the interrupt 2772 * handler triggered on the SEL for reselect take care of lost arbitrations 2773 * where necessary, meaning interrupts need to be enabled. 2774 * 2775 * When interrupts are enabled, the queues may change - so we 2776 * can't remove it from the disconnected queue before selecting it 2777 * because that could cause a failure in hashing the nexus if that 2778 * device reselected. 2779 * 2780 * Since the queues may change, we can't use the pointers from when we 2781 * first locate it. 2782 * 2783 * So, we must first locate the command, and if NCR5380_select() 2784 * succeeds, then issue the abort, relocate the command and remove 2785 * it from the disconnected queue. 2786 */ 2787 2788 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2789 if (cmd == tmp) { 2790 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); 2791 2792 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2793 return FAILED; 2794 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); 2795 2796 do_abort(instance); 2797 2798 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) 2799 if (cmd == tmp) { 2800 REMOVE(5, *prev, tmp, tmp->host_scribble); 2801 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2802 tmp->host_scribble = NULL; 2803 tmp->result = DID_ABORT << 16; 2804 tmp->scsi_done(tmp); 2805 return SUCCESS; 2806 } 2807 } 2808 /* 2809 * Case 5 : If we reached this point, the command was not found in any of 2810 * the queues. 2811 * 2812 * We probably reached this point because of an unlikely race condition 2813 * between the command completing successfully and the abortion code, 2814 * so we won't panic, but we will notify the user in case something really 2815 * broke. 2816 */ 2817 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2818 " before abortion\n", instance->host_no); 2819 return FAILED; 2820 } 2821 2822 2823 /* 2824 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2825 * 2826 * Purpose : reset the SCSI bus. 2827 * 2828 * Returns : SUCCESS 2829 * 2830 * Locks: host lock taken by caller 2831 */ 2832 2833 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2834 { 2835 struct Scsi_Host *instance = cmd->device->host; 2836 2837 NCR5380_local_declare(); 2838 NCR5380_setup(instance); 2839 NCR5380_print_status(instance); 2840 2841 spin_lock_irq(instance->host_lock); 2842 do_reset(instance); 2843 spin_unlock_irq(instance->host_lock); 2844 2845 return SUCCESS; 2846 } 2847