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 * Revision 1.10 1998/9/2 Alan Cox 31 * (alan@lxorguk.ukuu.org.uk) 32 * Fixed up the timer lockups reported so far. Things still suck. Looking 33 * forward to 2.3 and per device request queues. Then it'll be possible to 34 * SMP thread this beast and improve life no end. 35 36 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg 37 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) 38 * (hopefully) fixed and enhanced USLEEP 39 * added support for DTC3181E card (for Mustek scanner) 40 * 41 42 * Revision 1.8 Ingmar Baumgart 43 * (ingmar@gonzo.schwaben.de) 44 * added support for NCR53C400a card 45 * 46 47 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) 48 * added proc_info 49 * added support needed for DTC 3180/3280 50 * fixed a couple of bugs 51 * 52 53 * Revision 1.5 1994/01/19 09:14:57 drew 54 * Fixed udelay() hack that was being used on DATAOUT phases 55 * instead of a proper wait for the final handshake. 56 * 57 * Revision 1.4 1994/01/19 06:44:25 drew 58 * *** empty log message *** 59 * 60 * Revision 1.3 1994/01/19 05:24:40 drew 61 * Added support for TCR LAST_BYTE_SENT bit. 62 * 63 * Revision 1.2 1994/01/15 06:14:11 drew 64 * REAL DMA support, bug fixes. 65 * 66 * Revision 1.1 1994/01/15 06:00:54 drew 67 * Initial revision 68 * 69 */ 70 71 /* 72 * Further development / testing that should be done : 73 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete 74 * code so that everything does the same thing that's done at the 75 * end of a pseudo-DMA read operation. 76 * 77 * 2. Fix REAL_DMA (interrupt driven, polled works fine) - 78 * basically, transfer size needs to be reduced by one 79 * and the last byte read as is done with PSEUDO_DMA. 80 * 81 * 4. Test SCSI-II tagged queueing (I have no devices which support 82 * tagged queueing) 83 * 84 * 5. Test linked command handling code after Eric is ready with 85 * the high level code. 86 */ 87 #include <scsi/scsi_dbg.h> 88 #include <scsi/scsi_transport_spi.h> 89 90 #if (NDEBUG & NDEBUG_LISTS) 91 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } 92 #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); } 93 #else 94 #define LIST(x,y) 95 #define REMOVE(w,x,y,z) 96 #endif 97 98 #ifndef notyet 99 #undef LINKED 100 #undef REAL_DMA 101 #endif 102 103 #ifdef REAL_DMA_POLL 104 #undef READ_OVERRUNS 105 #define READ_OVERRUNS 106 #endif 107 108 #ifdef BOARD_REQUIRES_NO_DELAY 109 #define io_recovery_delay(x) 110 #else 111 #define io_recovery_delay(x) udelay(x) 112 #endif 113 114 /* 115 * Design 116 * 117 * This is a generic 5380 driver. To use it on a different platform, 118 * one simply writes appropriate system specific macros (ie, data 119 * transfer - some PC's will use the I/O bus, 68K's must use 120 * memory mapped) and drops this file in their 'C' wrapper. 121 * 122 * (Note from hch: unfortunately it was not enough for the different 123 * m68k folks and instead of improving this driver they copied it 124 * and hacked it up for their needs. As a consequence they lost 125 * most updates to this driver. Maybe someone will fix all these 126 * drivers to use a common core one day..) 127 * 128 * As far as command queueing, two queues are maintained for 129 * each 5380 in the system - commands that haven't been issued yet, 130 * and commands that are currently executing. This means that an 131 * unlimited number of commands may be queued, letting 132 * more commands propagate from the higher driver levels giving higher 133 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 134 * allowing multiple commands to propagate all the way to a SCSI-II device 135 * while a command is already executing. 136 * 137 * 138 * Issues specific to the NCR5380 : 139 * 140 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 141 * piece of hardware that requires you to sit in a loop polling for 142 * the REQ signal as long as you are connected. Some devices are 143 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 144 * while doing long seek operations. 145 * 146 * The workaround for this is to keep track of devices that have 147 * disconnected. If the device hasn't disconnected, for commands that 148 * should disconnect, we do something like 149 * 150 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } 151 * 152 * Some tweaking of N and M needs to be done. An algorithm based 153 * on "time to data" would give the best results as long as short time 154 * to datas (ie, on the same track) were considered, however these 155 * broken devices are the exception rather than the rule and I'd rather 156 * spend my time optimizing for the normal case. 157 * 158 * Architecture : 159 * 160 * At the heart of the design is a coroutine, NCR5380_main, 161 * which is started from a workqueue for each NCR5380 host in the 162 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by 163 * removing the commands from the issue queue and calling 164 * NCR5380_select() if a nexus is not established. 165 * 166 * Once a nexus is established, the NCR5380_information_transfer() 167 * phase goes through the various phases as instructed by the target. 168 * if the target goes into MSG IN and sends a DISCONNECT message, 169 * the command structure is placed into the per instance disconnected 170 * queue, and NCR5380_main tries to find more work. If the target is 171 * idle for too long, the system will try to sleep. 172 * 173 * If a command has disconnected, eventually an interrupt will trigger, 174 * calling NCR5380_intr() which will in turn call NCR5380_reselect 175 * to reestablish a nexus. This will run main if necessary. 176 * 177 * On command termination, the done function will be called as 178 * appropriate. 179 * 180 * SCSI pointers are maintained in the SCp field of SCSI command 181 * structures, being initialized after the command is connected 182 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 183 * Note that in violation of the standard, an implicit SAVE POINTERS operation 184 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 185 */ 186 187 /* 188 * Using this file : 189 * This file a skeleton Linux SCSI driver for the NCR 5380 series 190 * of chips. To use it, you write an architecture specific functions 191 * and macros and include this file in your driver. 192 * 193 * These macros control options : 194 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 195 * defined. 196 * 197 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 198 * for commands that return with a CHECK CONDITION status. 199 * 200 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential 201 * transceivers. 202 * 203 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or 204 * override-configure an IRQ. 205 * 206 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 207 * bytes at a time. Since interrupts are disabled by default during 208 * these transfers, we might need this to give reasonable interrupt 209 * service time if the transfer size gets too large. 210 * 211 * LINKED - if defined, linked commands are supported. 212 * 213 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. 214 * 215 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 216 * 217 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't 218 * rely on phase mismatch and EOP interrupts to determine end 219 * of phase. 220 * 221 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You 222 * only really want to use this if you're having a problem with 223 * dropped characters during high speed communications, and even 224 * then, you're going to be better off twiddling with transfersize 225 * in the high level code. 226 * 227 * Defaults for these will be provided although the user may want to adjust 228 * these to allocate CPU resources to the SCSI driver or "real" code. 229 * 230 * USLEEP_SLEEP - amount of time, in jiffies, to sleep 231 * 232 * USLEEP_POLL - amount of time, in jiffies, to poll 233 * 234 * These macros MUST be defined : 235 * NCR5380_local_declare() - declare any local variables needed for your 236 * transfer routines. 237 * 238 * NCR5380_setup(instance) - initialize any local variables needed from a given 239 * instance of the host adapter for NCR5380_{read,write,pread,pwrite} 240 * 241 * NCR5380_read(register) - read from the specified register 242 * 243 * NCR5380_write(register, value) - write to the specific register 244 * 245 * NCR5380_implementation_fields - additional fields needed for this 246 * specific implementation of the NCR5380 247 * 248 * Either real DMA *or* pseudo DMA may be implemented 249 * REAL functions : 250 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 251 * Note that the DMA setup functions should return the number of bytes 252 * that they were able to program the controller for. 253 * 254 * Also note that generic i386/PC versions of these macros are 255 * available as NCR5380_i386_dma_write_setup, 256 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 257 * 258 * NCR5380_dma_write_setup(instance, src, count) - initialize 259 * NCR5380_dma_read_setup(instance, dst, count) - initialize 260 * NCR5380_dma_residual(instance); - residual count 261 * 262 * PSEUDO functions : 263 * NCR5380_pwrite(instance, src, count) 264 * NCR5380_pread(instance, dst, count); 265 * 266 * The generic driver is initialized by calling NCR5380_init(instance), 267 * after setting the appropriate host specific fields and ID. If the 268 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 269 * possible) function may be used. 270 */ 271 272 static int do_abort(struct Scsi_Host *host); 273 static void do_reset(struct Scsi_Host *host); 274 275 /* 276 * initialize_SCp - init the scsi pointer field 277 * @cmd: command block to set up 278 * 279 * Set up the internal fields in the SCSI command. 280 */ 281 282 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) 283 { 284 /* 285 * Initialize the Scsi Pointer field so that all of the commands in the 286 * various queues are valid. 287 */ 288 289 if (scsi_bufflen(cmd)) { 290 cmd->SCp.buffer = scsi_sglist(cmd); 291 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; 292 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 293 cmd->SCp.this_residual = cmd->SCp.buffer->length; 294 } else { 295 cmd->SCp.buffer = NULL; 296 cmd->SCp.buffers_residual = 0; 297 cmd->SCp.ptr = NULL; 298 cmd->SCp.this_residual = 0; 299 } 300 } 301 302 /** 303 * NCR5380_poll_politely - wait for NCR5380 status bits 304 * @instance: controller to poll 305 * @reg: 5380 register to poll 306 * @bit: Bitmask to check 307 * @val: Value required to exit 308 * 309 * Polls the NCR5380 in a reasonably efficient manner waiting for 310 * an event to occur, after a short quick poll we begin giving the 311 * CPU back in non IRQ contexts 312 * 313 * Returns the value of the register or a negative error code. 314 */ 315 316 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) 317 { 318 NCR5380_local_declare(); 319 int n = 500; /* At about 8uS a cycle for the cpu access */ 320 unsigned long end = jiffies + t; 321 int r; 322 323 NCR5380_setup(instance); 324 325 while( n-- > 0) 326 { 327 r = NCR5380_read(reg); 328 if((r & bit) == val) 329 return 0; 330 cpu_relax(); 331 } 332 333 /* t time yet ? */ 334 while(time_before(jiffies, end)) 335 { 336 r = NCR5380_read(reg); 337 if((r & bit) == val) 338 return 0; 339 if(!in_interrupt()) 340 cond_resched(); 341 else 342 cpu_relax(); 343 } 344 return -ETIMEDOUT; 345 } 346 347 static struct { 348 unsigned char value; 349 const char *name; 350 } phases[] __maybe_unused = { 351 {PHASE_DATAOUT, "DATAOUT"}, 352 {PHASE_DATAIN, "DATAIN"}, 353 {PHASE_CMDOUT, "CMDOUT"}, 354 {PHASE_STATIN, "STATIN"}, 355 {PHASE_MSGOUT, "MSGOUT"}, 356 {PHASE_MSGIN, "MSGIN"}, 357 {PHASE_UNKNOWN, "UNKNOWN"} 358 }; 359 360 #if NDEBUG 361 static struct { 362 unsigned char mask; 363 const char *name; 364 } signals[] = { 365 {SR_DBP, "PARITY"}, 366 {SR_RST, "RST"}, 367 {SR_BSY, "BSY"}, 368 {SR_REQ, "REQ"}, 369 {SR_MSG, "MSG"}, 370 {SR_CD, "CD"}, 371 {SR_IO, "IO"}, 372 {SR_SEL, "SEL"}, 373 {0, NULL} 374 }, 375 basrs[] = { 376 {BASR_ATN, "ATN"}, 377 {BASR_ACK, "ACK"}, 378 {0, NULL} 379 }, 380 icrs[] = { 381 {ICR_ASSERT_RST, "ASSERT RST"}, 382 {ICR_ASSERT_ACK, "ASSERT ACK"}, 383 {ICR_ASSERT_BSY, "ASSERT BSY"}, 384 {ICR_ASSERT_SEL, "ASSERT SEL"}, 385 {ICR_ASSERT_ATN, "ASSERT ATN"}, 386 {ICR_ASSERT_DATA, "ASSERT DATA"}, 387 {0, NULL} 388 }, 389 mrs[] = { 390 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 391 {MR_TARGET, "MODE TARGET"}, 392 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 393 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 394 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 395 {MR_DMA_MODE, "MODE DMA"}, 396 {MR_ARBITRATE, "MODE ARBITRATION"}, 397 {0, NULL} 398 }; 399 400 /** 401 * NCR5380_print - print scsi bus signals 402 * @instance: adapter state to dump 403 * 404 * Print the SCSI bus signals for debugging purposes 405 * 406 * Locks: caller holds hostdata lock (not essential) 407 */ 408 409 static void NCR5380_print(struct Scsi_Host *instance) 410 { 411 NCR5380_local_declare(); 412 unsigned char status, data, basr, mr, icr, i; 413 NCR5380_setup(instance); 414 415 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 416 status = NCR5380_read(STATUS_REG); 417 mr = NCR5380_read(MODE_REG); 418 icr = NCR5380_read(INITIATOR_COMMAND_REG); 419 basr = NCR5380_read(BUS_AND_STATUS_REG); 420 421 printk("STATUS_REG: %02x ", status); 422 for (i = 0; signals[i].mask; ++i) 423 if (status & signals[i].mask) 424 printk(",%s", signals[i].name); 425 printk("\nBASR: %02x ", basr); 426 for (i = 0; basrs[i].mask; ++i) 427 if (basr & basrs[i].mask) 428 printk(",%s", basrs[i].name); 429 printk("\nICR: %02x ", icr); 430 for (i = 0; icrs[i].mask; ++i) 431 if (icr & icrs[i].mask) 432 printk(",%s", icrs[i].name); 433 printk("\nMODE: %02x ", mr); 434 for (i = 0; mrs[i].mask; ++i) 435 if (mr & mrs[i].mask) 436 printk(",%s", mrs[i].name); 437 printk("\n"); 438 } 439 440 441 /* 442 * NCR5380_print_phase - show SCSI phase 443 * @instance: adapter to dump 444 * 445 * Print the current SCSI phase for debugging purposes 446 * 447 * Locks: none 448 */ 449 450 static void NCR5380_print_phase(struct Scsi_Host *instance) 451 { 452 NCR5380_local_declare(); 453 unsigned char status; 454 int i; 455 NCR5380_setup(instance); 456 457 status = NCR5380_read(STATUS_REG); 458 if (!(status & SR_REQ)) 459 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); 460 else { 461 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); 462 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); 463 } 464 } 465 #endif 466 467 /* 468 * These need tweaking, and would probably work best as per-device 469 * flags initialized differently for disk, tape, cd, etc devices. 470 * People with broken devices are free to experiment as to what gives 471 * the best results for them. 472 * 473 * USLEEP_SLEEP should be a minimum seek time. 474 * 475 * USLEEP_POLL should be a maximum rotational latency. 476 */ 477 #ifndef USLEEP_SLEEP 478 /* 20 ms (reasonable hard disk speed) */ 479 #define USLEEP_SLEEP (20*HZ/1000) 480 #endif 481 /* 300 RPM (floppy speed) */ 482 #ifndef USLEEP_POLL 483 #define USLEEP_POLL (200*HZ/1000) 484 #endif 485 #ifndef USLEEP_WAITLONG 486 /* RvC: (reasonable time to wait on select error) */ 487 #define USLEEP_WAITLONG USLEEP_SLEEP 488 #endif 489 490 /* 491 * Function : int should_disconnect (unsigned char cmd) 492 * 493 * Purpose : decide whether a command would normally disconnect or 494 * not, since if it won't disconnect we should go to sleep. 495 * 496 * Input : cmd - opcode of SCSI command 497 * 498 * Returns : DISCONNECT_LONG if we should disconnect for a really long 499 * time (ie always, sleep, look for REQ active, sleep), 500 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal 501 * time-to-data delay, DISCONNECT_NONE if this command would return 502 * immediately. 503 * 504 * Future sleep algorithms based on time to data can exploit 505 * something like this so they can differentiate between "normal" 506 * (ie, read, write, seek) and unusual commands (ie, * format). 507 * 508 * Note : We don't deal with commands that handle an immediate disconnect, 509 * 510 */ 511 512 static int should_disconnect(unsigned char cmd) 513 { 514 switch (cmd) { 515 case READ_6: 516 case WRITE_6: 517 case SEEK_6: 518 case READ_10: 519 case WRITE_10: 520 case SEEK_10: 521 return DISCONNECT_TIME_TO_DATA; 522 case FORMAT_UNIT: 523 case SEARCH_HIGH: 524 case SEARCH_LOW: 525 case SEARCH_EQUAL: 526 return DISCONNECT_LONG; 527 default: 528 return DISCONNECT_NONE; 529 } 530 } 531 532 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) 533 { 534 hostdata->time_expires = jiffies + timeout; 535 schedule_delayed_work(&hostdata->coroutine, timeout); 536 } 537 538 539 static int probe_irq __initdata = 0; 540 541 /** 542 * probe_intr - helper for IRQ autoprobe 543 * @irq: interrupt number 544 * @dev_id: unused 545 * @regs: unused 546 * 547 * Set a flag to indicate the IRQ in question was received. This is 548 * used by the IRQ probe code. 549 */ 550 551 static irqreturn_t __init probe_intr(int irq, void *dev_id) 552 { 553 probe_irq = irq; 554 return IRQ_HANDLED; 555 } 556 557 /** 558 * NCR5380_probe_irq - find the IRQ of an NCR5380 559 * @instance: NCR5380 controller 560 * @possible: bitmask of ISA IRQ lines 561 * 562 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ 563 * and then looking to see what interrupt actually turned up. 564 * 565 * Locks: none, irqs must be enabled on entry 566 */ 567 568 static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, 569 int possible) 570 { 571 NCR5380_local_declare(); 572 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 573 unsigned long timeout; 574 int trying_irqs, i, mask; 575 NCR5380_setup(instance); 576 577 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) 578 if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0)) 579 trying_irqs |= mask; 580 581 timeout = jiffies + (250 * HZ / 1000); 582 probe_irq = SCSI_IRQ_NONE; 583 584 /* 585 * A interrupt is triggered whenever BSY = false, SEL = true 586 * and a bit set in the SELECT_ENABLE_REG is asserted on the 587 * SCSI bus. 588 * 589 * Note that the bus is only driven when the phase control signals 590 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 591 * to zero. 592 */ 593 594 NCR5380_write(TARGET_COMMAND_REG, 0); 595 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 596 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 597 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 598 599 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) 600 schedule_timeout_uninterruptible(1); 601 602 NCR5380_write(SELECT_ENABLE_REG, 0); 603 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 604 605 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 606 if (trying_irqs & mask) 607 free_irq(i, NULL); 608 609 return probe_irq; 610 } 611 612 /** 613 * NCR58380_print_options - show options 614 * @instance: unused for now 615 * 616 * Called by probe code indicating the NCR5380 driver options that 617 * were selected. At some point this will switch to runtime options 618 * read from the adapter in question 619 * 620 * Locks: none 621 */ 622 623 static void __init __maybe_unused 624 NCR5380_print_options(struct Scsi_Host *instance) 625 { 626 printk(" generic options" 627 #ifdef AUTOPROBE_IRQ 628 " AUTOPROBE_IRQ" 629 #endif 630 #ifdef AUTOSENSE 631 " AUTOSENSE" 632 #endif 633 #ifdef DIFFERENTIAL 634 " DIFFERENTIAL" 635 #endif 636 #ifdef REAL_DMA 637 " REAL DMA" 638 #endif 639 #ifdef REAL_DMA_POLL 640 " REAL DMA POLL" 641 #endif 642 #ifdef PARITY 643 " PARITY" 644 #endif 645 #ifdef PSEUDO_DMA 646 " PSEUDO DMA" 647 #endif 648 #ifdef UNSAFE 649 " UNSAFE " 650 #endif 651 ); 652 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 653 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 654 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 655 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 656 } 657 } 658 659 /** 660 * NCR5380_print_status - dump controller info 661 * @instance: controller to dump 662 * 663 * Print commands in the various queues, called from NCR5380_abort 664 * and NCR5380_debug to aid debugging. 665 * 666 * Locks: called functions disable irqs 667 */ 668 669 static void NCR5380_print_status(struct Scsi_Host *instance) 670 { 671 NCR5380_dprint(NDEBUG_ANY, instance); 672 NCR5380_dprint_phase(NDEBUG_ANY, instance); 673 } 674 675 /******************************************/ 676 /* 677 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 678 * 679 * *buffer: I/O buffer 680 * **start: if inout == FALSE pointer into buffer where user read should start 681 * offset: current offset 682 * length: length of buffer 683 * hostno: Scsi_Host host_no 684 * inout: TRUE - user is writing; FALSE - user is reading 685 * 686 * Return the number of bytes read from or written 687 */ 688 689 static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, 690 char *buffer, int length) 691 { 692 #ifdef DTC_PUBLIC_RELEASE 693 dtc_wmaxi = dtc_maxi = 0; 694 #endif 695 #ifdef PAS16_PUBLIC_RELEASE 696 pas_wmaxi = pas_maxi = 0; 697 #endif 698 return (-ENOSYS); /* Currently this is a no-op */ 699 } 700 701 #undef SPRINTF 702 #define SPRINTF(args...) seq_printf(m, ## args) 703 static 704 void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m); 705 static 706 void lprint_command(unsigned char *cmd, struct seq_file *m); 707 static 708 void lprint_opcode(int opcode, struct seq_file *m); 709 710 static int __maybe_unused NCR5380_show_info(struct seq_file *m, 711 struct Scsi_Host *instance) 712 { 713 struct NCR5380_hostdata *hostdata; 714 Scsi_Cmnd *ptr; 715 716 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 717 718 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 719 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 720 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 721 #ifdef DTC_PUBLIC_RELEASE 722 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 723 #endif 724 #ifdef T128_PUBLIC_RELEASE 725 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 726 #endif 727 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 728 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 729 #endif 730 #ifdef PAS16_PUBLIC_RELEASE 731 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 732 #endif 733 734 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 735 SPRINTF("io_port: %04x ", (int) instance->io_port); 736 if (instance->irq == SCSI_IRQ_NONE) 737 SPRINTF("IRQ: None.\n"); 738 else 739 SPRINTF("IRQ: %d.\n", instance->irq); 740 741 #ifdef DTC_PUBLIC_RELEASE 742 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 743 #endif 744 #ifdef PAS16_PUBLIC_RELEASE 745 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 746 #endif 747 spin_lock_irq(instance->host_lock); 748 if (!hostdata->connected) 749 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 750 else 751 lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m); 752 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 753 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 754 lprint_Scsi_Cmnd(ptr, m); 755 756 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 757 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 758 lprint_Scsi_Cmnd(ptr, m); 759 spin_unlock_irq(instance->host_lock); 760 return 0; 761 } 762 763 static void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m) 764 { 765 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 766 SPRINTF(" command = "); 767 lprint_command(cmd->cmnd, m); 768 } 769 770 static void lprint_command(unsigned char *command, struct seq_file *m) 771 { 772 int i, s; 773 lprint_opcode(command[0], m); 774 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 775 SPRINTF("%02x ", command[i]); 776 SPRINTF("\n"); 777 } 778 779 static void lprint_opcode(int opcode, struct seq_file *m) 780 { 781 SPRINTF("%2d (0x%02x)", opcode, opcode); 782 } 783 784 785 /** 786 * NCR5380_init - initialise an NCR5380 787 * @instance: adapter to configure 788 * @flags: control flags 789 * 790 * Initializes *instance and corresponding 5380 chip, 791 * with flags OR'd into the initial flags value. 792 * 793 * Notes : I assume that the host, hostno, and id bits have been 794 * set correctly. I don't care about the irq and other fields. 795 * 796 * Returns 0 for success 797 * 798 * Locks: interrupts must be enabled when we are called 799 */ 800 801 static int NCR5380_init(struct Scsi_Host *instance, int flags) 802 { 803 NCR5380_local_declare(); 804 int i, pass; 805 unsigned long timeout; 806 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 807 808 if(in_interrupt()) 809 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 810 /* 811 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 812 * the base address. 813 */ 814 815 #ifdef NCR53C400 816 if (flags & FLAG_NCR53C400) 817 instance->NCR5380_instance_name += NCR53C400_address_adjust; 818 #endif 819 820 NCR5380_setup(instance); 821 822 hostdata->aborted = 0; 823 hostdata->id_mask = 1 << instance->this_id; 824 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 825 if (i > hostdata->id_mask) 826 hostdata->id_higher_mask |= i; 827 for (i = 0; i < 8; ++i) 828 hostdata->busy[i] = 0; 829 #ifdef REAL_DMA 830 hostdata->dmalen = 0; 831 #endif 832 hostdata->targets_present = 0; 833 hostdata->connected = NULL; 834 hostdata->issue_queue = NULL; 835 hostdata->disconnected_queue = NULL; 836 837 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); 838 839 #ifdef NCR5380_STATS 840 for (i = 0; i < 8; ++i) { 841 hostdata->time_read[i] = 0; 842 hostdata->time_write[i] = 0; 843 hostdata->bytes_read[i] = 0; 844 hostdata->bytes_write[i] = 0; 845 } 846 hostdata->timebase = 0; 847 hostdata->pendingw = 0; 848 hostdata->pendingr = 0; 849 #endif 850 851 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 852 if (flags & FLAG_NCR53C400) 853 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 854 else 855 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 856 857 hostdata->host = instance; 858 hostdata->time_expires = 0; 859 860 #ifndef AUTOSENSE 861 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 862 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 863 " be incorrectly cleared.\n", instance->host_no); 864 #endif /* def AUTOSENSE */ 865 866 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 867 NCR5380_write(MODE_REG, MR_BASE); 868 NCR5380_write(TARGET_COMMAND_REG, 0); 869 NCR5380_write(SELECT_ENABLE_REG, 0); 870 871 #ifdef NCR53C400 872 if (hostdata->flags & FLAG_NCR53C400) { 873 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 874 } 875 #endif 876 877 /* 878 * Detect and correct bus wedge problems. 879 * 880 * If the system crashed, it may have crashed in a state 881 * where a SCSI command was still executing, and the 882 * SCSI bus is not in a BUS FREE STATE. 883 * 884 * If this is the case, we'll try to abort the currently 885 * established nexus which we know nothing about, and that 886 * failing, do a hard reset of the SCSI bus 887 */ 888 889 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 890 switch (pass) { 891 case 1: 892 case 3: 893 case 5: 894 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 895 timeout = jiffies + 5 * HZ; 896 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 897 break; 898 case 2: 899 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 900 do_abort(instance); 901 break; 902 case 4: 903 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 904 do_reset(instance); 905 break; 906 case 6: 907 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 908 return -ENXIO; 909 } 910 } 911 return 0; 912 } 913 914 /** 915 * NCR5380_exit - remove an NCR5380 916 * @instance: adapter to remove 917 */ 918 919 static void NCR5380_exit(struct Scsi_Host *instance) 920 { 921 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 922 923 cancel_delayed_work_sync(&hostdata->coroutine); 924 } 925 926 /** 927 * NCR5380_queue_command - queue a command 928 * @cmd: SCSI command 929 * @done: completion handler 930 * 931 * cmd is added to the per instance issue_queue, with minor 932 * twiddling done to the host specific fields of cmd. If the 933 * main coroutine is not running, it is restarted. 934 * 935 * Locks: host lock taken by caller 936 */ 937 938 static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 939 { 940 struct Scsi_Host *instance = cmd->device->host; 941 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 942 Scsi_Cmnd *tmp; 943 944 #if (NDEBUG & NDEBUG_NO_WRITE) 945 switch (cmd->cmnd[0]) { 946 case WRITE_6: 947 case WRITE_10: 948 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 949 cmd->result = (DID_ERROR << 16); 950 done(cmd); 951 return 0; 952 } 953 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 954 955 #ifdef NCR5380_STATS 956 switch (cmd->cmnd[0]) { 957 case WRITE: 958 case WRITE_6: 959 case WRITE_10: 960 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 961 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd); 962 hostdata->pendingw++; 963 break; 964 case READ: 965 case READ_6: 966 case READ_10: 967 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 968 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd); 969 hostdata->pendingr++; 970 break; 971 } 972 #endif 973 974 /* 975 * We use the host_scribble field as a pointer to the next command 976 * in a queue 977 */ 978 979 cmd->host_scribble = NULL; 980 cmd->scsi_done = done; 981 cmd->result = 0; 982 983 /* 984 * Insert the cmd into the issue queue. Note that REQUEST SENSE 985 * commands are added to the head of the queue since any command will 986 * clear the contingent allegiance condition that exists and the 987 * sense data is only guaranteed to be valid while the condition exists. 988 */ 989 990 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 991 LIST(cmd, hostdata->issue_queue); 992 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 993 hostdata->issue_queue = cmd; 994 } else { 995 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 996 LIST(cmd, tmp); 997 tmp->host_scribble = (unsigned char *) cmd; 998 } 999 dprintk(NDEBUG_QUEUES, "scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); 1000 1001 /* Run the coroutine if it isn't already running. */ 1002 /* Kick off command processing */ 1003 schedule_delayed_work(&hostdata->coroutine, 0); 1004 return 0; 1005 } 1006 1007 static DEF_SCSI_QCMD(NCR5380_queue_command) 1008 1009 /** 1010 * NCR5380_main - NCR state machines 1011 * 1012 * NCR5380_main is a coroutine that runs as long as more work can 1013 * be done on the NCR5380 host adapters in a system. Both 1014 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1015 * in case it is not running. 1016 * 1017 * Locks: called as its own thread with no locks held. Takes the 1018 * host lock and called routines may take the isa dma lock. 1019 */ 1020 1021 static void NCR5380_main(struct work_struct *work) 1022 { 1023 struct NCR5380_hostdata *hostdata = 1024 container_of(work, struct NCR5380_hostdata, coroutine.work); 1025 struct Scsi_Host *instance = hostdata->host; 1026 Scsi_Cmnd *tmp, *prev; 1027 int done; 1028 1029 spin_lock_irq(instance->host_lock); 1030 do { 1031 /* Lock held here */ 1032 done = 1; 1033 if (!hostdata->connected && !hostdata->selecting) { 1034 dprintk(NDEBUG_MAIN, "scsi%d : not connected\n", instance->host_no); 1035 /* 1036 * Search through the issue_queue for a command destined 1037 * for a target that's not busy. 1038 */ 1039 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1040 { 1041 if (prev != tmp) 1042 dprintk(NDEBUG_LISTS, "MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->device->id, hostdata->busy[tmp->device->id], tmp->device->lun); 1043 /* When we find one, remove it from the issue queue. */ 1044 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1045 if (prev) { 1046 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1047 prev->host_scribble = tmp->host_scribble; 1048 } else { 1049 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1050 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1051 } 1052 tmp->host_scribble = NULL; 1053 1054 /* 1055 * Attempt to establish an I_T_L nexus here. 1056 * On success, instance->hostdata->connected is set. 1057 * On failure, we must add the command back to the 1058 * issue queue so we can keep trying. 1059 */ 1060 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->device->id, tmp->device->lun); 1061 1062 /* 1063 * A successful selection is defined as one that 1064 * leaves us with the command connected and 1065 * in hostdata->connected, OR has terminated the 1066 * command. 1067 * 1068 * With successful commands, we fall through 1069 * and see if we can do an information transfer, 1070 * with failures we will restart. 1071 */ 1072 hostdata->selecting = NULL; 1073 /* RvC: have to preset this to indicate a new command is being performed */ 1074 1075 if (!NCR5380_select(instance, tmp, 1076 /* 1077 * REQUEST SENSE commands are issued without tagged 1078 * queueing, even on SCSI-II devices because the 1079 * contingent allegiance condition exists for the 1080 * entire unit. 1081 */ 1082 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1083 break; 1084 } else { 1085 LIST(tmp, hostdata->issue_queue); 1086 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1087 hostdata->issue_queue = tmp; 1088 done = 0; 1089 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no); 1090 } 1091 /* lock held here still */ 1092 } /* if target/lun is not busy */ 1093 } /* for */ 1094 /* exited locked */ 1095 } /* if (!hostdata->connected) */ 1096 if (hostdata->selecting) { 1097 tmp = (Scsi_Cmnd *) hostdata->selecting; 1098 /* Selection will drop and retake the lock */ 1099 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1100 /* Ok ?? */ 1101 } else { 1102 /* RvC: device failed, so we wait a long time 1103 this is needed for Mustek scanners, that 1104 do not respond to commands immediately 1105 after a scan */ 1106 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1107 LIST(tmp, hostdata->issue_queue); 1108 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1109 hostdata->issue_queue = tmp; 1110 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1111 } 1112 } /* if hostdata->selecting */ 1113 if (hostdata->connected 1114 #ifdef REAL_DMA 1115 && !hostdata->dmalen 1116 #endif 1117 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1118 ) { 1119 dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no); 1120 NCR5380_information_transfer(instance); 1121 dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no); 1122 done = 0; 1123 } else 1124 break; 1125 } while (!done); 1126 1127 spin_unlock_irq(instance->host_lock); 1128 } 1129 1130 #ifndef DONT_USE_INTR 1131 1132 /** 1133 * NCR5380_intr - generic NCR5380 irq handler 1134 * @irq: interrupt number 1135 * @dev_id: device info 1136 * 1137 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1138 * from the disconnected queue, and restarting NCR5380_main() 1139 * as required. 1140 * 1141 * Locks: takes the needed instance locks 1142 */ 1143 1144 static irqreturn_t NCR5380_intr(int dummy, void *dev_id) 1145 { 1146 NCR5380_local_declare(); 1147 struct Scsi_Host *instance = dev_id; 1148 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1149 int done; 1150 unsigned char basr; 1151 unsigned long flags; 1152 1153 dprintk(NDEBUG_INTR, "scsi : NCR5380 irq %d triggered\n", 1154 instance->irq); 1155 1156 do { 1157 done = 1; 1158 spin_lock_irqsave(instance->host_lock, flags); 1159 /* Look for pending interrupts */ 1160 NCR5380_setup(instance); 1161 basr = NCR5380_read(BUS_AND_STATUS_REG); 1162 /* XXX dispatch to appropriate routine if found and done=0 */ 1163 if (basr & BASR_IRQ) { 1164 NCR5380_dprint(NDEBUG_INTR, instance); 1165 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1166 done = 0; 1167 dprintk(NDEBUG_INTR, "scsi%d : SEL interrupt\n", instance->host_no); 1168 NCR5380_reselect(instance); 1169 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1170 } else if (basr & BASR_PARITY_ERROR) { 1171 dprintk(NDEBUG_INTR, "scsi%d : PARITY interrupt\n", instance->host_no); 1172 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1173 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1174 dprintk(NDEBUG_INTR, "scsi%d : RESET interrupt\n", instance->host_no); 1175 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1176 } else { 1177 #if defined(REAL_DMA) 1178 /* 1179 * We should only get PHASE MISMATCH and EOP interrupts 1180 * if we have DMA enabled, so do a sanity check based on 1181 * the current setting of the MODE register. 1182 */ 1183 1184 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1185 int transferred; 1186 1187 if (!hostdata->connected) 1188 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1189 1190 transferred = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1191 hostdata->connected->SCp.this_residual -= transferred; 1192 hostdata->connected->SCp.ptr += transferred; 1193 hostdata->dmalen = 0; 1194 1195 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1196 1197 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1198 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1199 1200 NCR5380_write(MODE_REG, MR_BASE); 1201 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1202 } 1203 #else 1204 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)); 1205 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1206 #endif 1207 } 1208 } /* if BASR_IRQ */ 1209 spin_unlock_irqrestore(instance->host_lock, flags); 1210 if(!done) 1211 schedule_delayed_work(&hostdata->coroutine, 0); 1212 } while (!done); 1213 return IRQ_HANDLED; 1214 } 1215 1216 #endif 1217 1218 /** 1219 * collect_stats - collect stats on a scsi command 1220 * @hostdata: adapter 1221 * @cmd: command being issued 1222 * 1223 * Update the statistical data by parsing the command in question 1224 */ 1225 1226 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1227 { 1228 #ifdef NCR5380_STATS 1229 switch (cmd->cmnd[0]) { 1230 case WRITE: 1231 case WRITE_6: 1232 case WRITE_10: 1233 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1234 hostdata->pendingw--; 1235 break; 1236 case READ: 1237 case READ_6: 1238 case READ_10: 1239 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1240 hostdata->pendingr--; 1241 break; 1242 } 1243 #endif 1244 } 1245 1246 1247 /* 1248 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1249 * int tag); 1250 * 1251 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1252 * including ARBITRATION, SELECTION, and initial message out for 1253 * IDENTIFY and queue messages. 1254 * 1255 * Inputs : instance - instantiation of the 5380 driver on which this 1256 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1257 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1258 * the command that is presently connected. 1259 * 1260 * Returns : -1 if selection could not execute for some reason, 1261 * 0 if selection succeeded or failed because the target 1262 * did not respond. 1263 * 1264 * Side effects : 1265 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1266 * with registers as they should have been on entry - ie 1267 * SELECT_ENABLE will be set appropriately, the NCR5380 1268 * will cease to drive any SCSI bus signals. 1269 * 1270 * If successful : I_T_L or I_T_L_Q nexus will be established, 1271 * instance->connected will be set to cmd. 1272 * SELECT interrupt will be disabled. 1273 * 1274 * If failed (no target) : cmd->scsi_done() will be called, and the 1275 * cmd->result host byte set to DID_BAD_TARGET. 1276 * 1277 * Locks: caller holds hostdata lock in IRQ mode 1278 */ 1279 1280 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1281 { 1282 NCR5380_local_declare(); 1283 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1284 unsigned char tmp[3], phase; 1285 unsigned char *data; 1286 int len; 1287 unsigned long timeout; 1288 unsigned char value; 1289 int err; 1290 NCR5380_setup(instance); 1291 1292 if (hostdata->selecting) 1293 goto part2; 1294 1295 hostdata->restart_select = 0; 1296 1297 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1298 dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id); 1299 1300 /* 1301 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1302 * data bus during SELECTION. 1303 */ 1304 1305 NCR5380_write(TARGET_COMMAND_REG, 0); 1306 1307 /* 1308 * Start arbitration. 1309 */ 1310 1311 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1312 NCR5380_write(MODE_REG, MR_ARBITRATE); 1313 1314 1315 /* We can be relaxed here, interrupts are on, we are 1316 in workqueue context, the birds are singing in the trees */ 1317 spin_unlock_irq(instance->host_lock); 1318 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1319 spin_lock_irq(instance->host_lock); 1320 if (err < 0) { 1321 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1322 NCR5380_write(MODE_REG, MR_BASE); 1323 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1324 goto failed; 1325 } 1326 1327 dprintk(NDEBUG_ARBITRATION, "scsi%d : arbitration complete\n", instance->host_no); 1328 1329 /* 1330 * The arbitration delay is 2.2us, but this is a minimum and there is 1331 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1332 * the integral nature of udelay(). 1333 * 1334 */ 1335 1336 udelay(3); 1337 1338 /* Check for lost arbitration */ 1339 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)) { 1340 NCR5380_write(MODE_REG, MR_BASE); 1341 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no); 1342 goto failed; 1343 } 1344 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1345 1346 if (!(hostdata->flags & FLAG_DTC3181E) && 1347 /* RvC: DTC3181E has some trouble with this 1348 * so we simply removed it. Seems to work with 1349 * only Mustek scanner attached 1350 */ 1351 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1352 NCR5380_write(MODE_REG, MR_BASE); 1353 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1354 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no); 1355 goto failed; 1356 } 1357 /* 1358 * Again, bus clear + bus settle time is 1.2us, however, this is 1359 * a minimum so we'll udelay ceil(1.2) 1360 */ 1361 1362 udelay(2); 1363 1364 dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no); 1365 1366 /* 1367 * Now that we have won arbitration, start Selection process, asserting 1368 * the host and target ID's on the SCSI bus. 1369 */ 1370 1371 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); 1372 1373 /* 1374 * Raise ATN while SEL is true before BSY goes false from arbitration, 1375 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1376 * phase immediately after selection. 1377 */ 1378 1379 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1380 NCR5380_write(MODE_REG, MR_BASE); 1381 1382 /* 1383 * Reselect interrupts must be turned off prior to the dropping of BSY, 1384 * otherwise we will trigger an interrupt. 1385 */ 1386 NCR5380_write(SELECT_ENABLE_REG, 0); 1387 1388 /* 1389 * The initiator shall then wait at least two deskew delays and release 1390 * the BSY signal. 1391 */ 1392 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1393 1394 /* Reset BSY */ 1395 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1396 1397 /* 1398 * Something weird happens when we cease to drive BSY - looks 1399 * like the board/chip is letting us do another read before the 1400 * appropriate propagation delay has expired, and we're confusing 1401 * a BSY signal from ourselves as the target's response to SELECTION. 1402 * 1403 * A small delay (the 'C++' frontend breaks the pipeline with an 1404 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1405 * tighter 'C' code breaks and requires this) solves the problem - 1406 * the 1 us delay is arbitrary, and only used because this delay will 1407 * be the same on other platforms and since it works here, it should 1408 * work there. 1409 * 1410 * wingel suggests that this could be due to failing to wait 1411 * one deskew delay. 1412 */ 1413 1414 udelay(1); 1415 1416 dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)); 1417 1418 /* 1419 * The SCSI specification calls for a 250 ms timeout for the actual 1420 * selection. 1421 */ 1422 1423 timeout = jiffies + (250 * HZ / 1000); 1424 1425 /* 1426 * XXX very interesting - we're seeing a bounce where the BSY we 1427 * asserted is being reflected / still asserted (propagation delay?) 1428 * and it's detecting as true. Sigh. 1429 */ 1430 1431 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1432 hostdata->selecting = cmd; 1433 1434 part2: 1435 /* RvC: here we enter after a sleeping period, or immediately after 1436 execution of part 1 1437 we poll only once ech clock tick */ 1438 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1439 1440 if (!value && (hostdata->select_time < HZ/4)) { 1441 /* RvC: we still must wait for a device response */ 1442 hostdata->select_time++; /* after 25 ticks the device has failed */ 1443 NCR5380_set_timer(hostdata, 1); 1444 return 0; /* RvC: we return here with hostdata->selecting set, 1445 to go to sleep */ 1446 } 1447 1448 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1449 waiting period */ 1450 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1451 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1452 NCR5380_reselect(instance); 1453 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1454 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1455 return -1; 1456 } 1457 /* 1458 * No less than two deskew delays after the initiator detects the 1459 * BSY signal is true, it shall release the SEL signal and may 1460 * change the DATA BUS. -wingel 1461 */ 1462 1463 udelay(1); 1464 1465 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1466 1467 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1468 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1469 if (hostdata->targets_present & (1 << scmd_id(cmd))) { 1470 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1471 if (hostdata->restart_select) 1472 printk(KERN_DEBUG "\trestart select\n"); 1473 NCR5380_dprint(NDEBUG_SELECTION, instance); 1474 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1475 return -1; 1476 } 1477 cmd->result = DID_BAD_TARGET << 16; 1478 collect_stats(hostdata, cmd); 1479 cmd->scsi_done(cmd); 1480 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1481 dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", instance->host_no); 1482 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1483 return 0; 1484 } 1485 hostdata->targets_present |= (1 << scmd_id(cmd)); 1486 1487 /* 1488 * Since we followed the SCSI spec, and raised ATN while SEL 1489 * was true but before BSY was false during selection, the information 1490 * transfer phase should be a MESSAGE OUT phase so that we can send the 1491 * IDENTIFY message. 1492 * 1493 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1494 * message (2 bytes) with a tag ID that we increment with every command 1495 * until it wraps back to 0. 1496 * 1497 * XXX - it turns out that there are some broken SCSI-II devices, 1498 * which claim to support tagged queuing but fail when more than 1499 * some number of commands are issued at once. 1500 */ 1501 1502 /* Wait for start of REQ/ACK handshake */ 1503 1504 spin_unlock_irq(instance->host_lock); 1505 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1506 spin_lock_irq(instance->host_lock); 1507 1508 if(err) { 1509 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1510 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1511 goto failed; 1512 } 1513 1514 dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id); 1515 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1516 1517 len = 1; 1518 cmd->tag = 0; 1519 1520 /* Send message(s) */ 1521 data = tmp; 1522 phase = PHASE_MSGOUT; 1523 NCR5380_transfer_pio(instance, &phase, &len, &data); 1524 dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no); 1525 /* XXX need to handle errors here */ 1526 hostdata->connected = cmd; 1527 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1528 1529 initialize_SCp(cmd); 1530 1531 return 0; 1532 1533 /* Selection failed */ 1534 failed: 1535 return -1; 1536 1537 } 1538 1539 /* 1540 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1541 * unsigned char *phase, int *count, unsigned char **data) 1542 * 1543 * Purpose : transfers data in given phase using polled I/O 1544 * 1545 * Inputs : instance - instance of driver, *phase - pointer to 1546 * what phase is expected, *count - pointer to number of 1547 * bytes to transfer, **data - pointer to data pointer. 1548 * 1549 * Returns : -1 when different phase is entered without transferring 1550 * maximum number of bytes, 0 if all bytes or transferred or exit 1551 * is in same phase. 1552 * 1553 * Also, *phase, *count, *data are modified in place. 1554 * 1555 * XXX Note : handling for bus free may be useful. 1556 */ 1557 1558 /* 1559 * Note : this code is not as quick as it could be, however it 1560 * IS 100% reliable, and for the actual data transfer where speed 1561 * counts, we will always do a pseudo DMA or DMA transfer. 1562 */ 1563 1564 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1565 NCR5380_local_declare(); 1566 unsigned char p = *phase, tmp; 1567 int c = *count; 1568 unsigned char *d = *data; 1569 /* 1570 * RvC: some administrative data to process polling time 1571 */ 1572 int break_allowed = 0; 1573 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1574 NCR5380_setup(instance); 1575 1576 if (!(p & SR_IO)) 1577 dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c); 1578 else 1579 dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c); 1580 1581 /* 1582 * The NCR5380 chip will only drive the SCSI bus when the 1583 * phase specified in the appropriate bits of the TARGET COMMAND 1584 * REGISTER match the STATUS REGISTER 1585 */ 1586 1587 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1588 1589 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1590 * so breaks are not necessary there 1591 */ 1592 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1593 break_allowed = 1; 1594 } 1595 do { 1596 /* 1597 * Wait for assertion of REQ, after which the phase bits will be 1598 * valid 1599 */ 1600 1601 /* RvC: we simply poll once, after that we stop temporarily 1602 * and let the device buffer fill up 1603 * if breaking is not allowed, we keep polling as long as needed 1604 */ 1605 1606 /* FIXME */ 1607 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1608 if (!(tmp & SR_REQ)) { 1609 /* timeout condition */ 1610 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1611 break; 1612 } 1613 1614 dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no); 1615 1616 /* Check for phase mismatch */ 1617 if ((tmp & PHASE_MASK) != p) { 1618 dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no); 1619 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1620 break; 1621 } 1622 /* Do actual transfer from SCSI bus to / from memory */ 1623 if (!(p & SR_IO)) 1624 NCR5380_write(OUTPUT_DATA_REG, *d); 1625 else 1626 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1627 1628 ++d; 1629 1630 /* 1631 * The SCSI standard suggests that in MSGOUT phase, the initiator 1632 * should drop ATN on the last byte of the message phase 1633 * after REQ has been asserted for the handshake but before 1634 * the initiator raises ACK. 1635 */ 1636 1637 if (!(p & SR_IO)) { 1638 if (!((p & SR_MSG) && c > 1)) { 1639 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1640 NCR5380_dprint(NDEBUG_PIO, instance); 1641 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1642 } else { 1643 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1644 NCR5380_dprint(NDEBUG_PIO, instance); 1645 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1646 } 1647 } else { 1648 NCR5380_dprint(NDEBUG_PIO, instance); 1649 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1650 } 1651 1652 /* FIXME - if this fails bus reset ?? */ 1653 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1654 dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no); 1655 1656 /* 1657 * We have several special cases to consider during REQ/ACK handshaking : 1658 * 1. We were in MSGOUT phase, and we are on the last byte of the 1659 * message. ATN must be dropped as ACK is dropped. 1660 * 1661 * 2. We are in a MSGIN phase, and we are on the last byte of the 1662 * message. We must exit with ACK asserted, so that the calling 1663 * code may raise ATN before dropping ACK to reject the message. 1664 * 1665 * 3. ACK and ATN are clear and the target may proceed as normal. 1666 */ 1667 if (!(p == PHASE_MSGIN && c == 1)) { 1668 if (p == PHASE_MSGOUT && c > 1) 1669 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1670 else 1671 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1672 } 1673 } while (--c); 1674 1675 dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c); 1676 1677 *count = c; 1678 *data = d; 1679 tmp = NCR5380_read(STATUS_REG); 1680 if (tmp & SR_REQ) 1681 *phase = tmp & PHASE_MASK; 1682 else 1683 *phase = PHASE_UNKNOWN; 1684 1685 if (!c || (*phase == p)) 1686 return 0; 1687 else 1688 return -1; 1689 } 1690 1691 /** 1692 * do_reset - issue a reset command 1693 * @host: adapter to reset 1694 * 1695 * Issue a reset sequence to the NCR5380 and try and get the bus 1696 * back into sane shape. 1697 * 1698 * Locks: caller holds queue lock 1699 */ 1700 1701 static void do_reset(struct Scsi_Host *host) { 1702 NCR5380_local_declare(); 1703 NCR5380_setup(host); 1704 1705 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1706 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1707 udelay(25); 1708 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1709 } 1710 1711 /* 1712 * Function : do_abort (Scsi_Host *host) 1713 * 1714 * Purpose : abort the currently established nexus. Should only be 1715 * called from a routine which can drop into a 1716 * 1717 * Returns : 0 on success, -1 on failure. 1718 * 1719 * Locks: queue lock held by caller 1720 * FIXME: sort this out and get new_eh running 1721 */ 1722 1723 static int do_abort(struct Scsi_Host *host) { 1724 NCR5380_local_declare(); 1725 unsigned char *msgptr, phase, tmp; 1726 int len; 1727 int rc; 1728 NCR5380_setup(host); 1729 1730 1731 /* Request message out phase */ 1732 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1733 1734 /* 1735 * Wait for the target to indicate a valid phase by asserting 1736 * REQ. Once this happens, we'll have either a MSGOUT phase 1737 * and can immediately send the ABORT message, or we'll have some 1738 * other phase and will have to source/sink data. 1739 * 1740 * We really don't care what value was on the bus or what value 1741 * the target sees, so we just handshake. 1742 */ 1743 1744 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1745 1746 if(rc < 0) 1747 return -1; 1748 1749 tmp = (unsigned char)rc; 1750 1751 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1752 1753 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1754 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1755 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1756 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1757 if(rc == -1) 1758 return -1; 1759 } 1760 tmp = ABORT; 1761 msgptr = &tmp; 1762 len = 1; 1763 phase = PHASE_MSGOUT; 1764 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1765 1766 /* 1767 * If we got here, and the command completed successfully, 1768 * we're about to go into bus free state. 1769 */ 1770 1771 return len ? -1 : 0; 1772 } 1773 1774 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1775 /* 1776 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1777 * unsigned char *phase, int *count, unsigned char **data) 1778 * 1779 * Purpose : transfers data in given phase using either real 1780 * or pseudo DMA. 1781 * 1782 * Inputs : instance - instance of driver, *phase - pointer to 1783 * what phase is expected, *count - pointer to number of 1784 * bytes to transfer, **data - pointer to data pointer. 1785 * 1786 * Returns : -1 when different phase is entered without transferring 1787 * maximum number of bytes, 0 if all bytes or transferred or exit 1788 * is in same phase. 1789 * 1790 * Also, *phase, *count, *data are modified in place. 1791 * 1792 * Locks: io_request lock held by caller 1793 */ 1794 1795 1796 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1797 NCR5380_local_declare(); 1798 register int c = *count; 1799 register unsigned char p = *phase; 1800 register unsigned char *d = *data; 1801 unsigned char tmp; 1802 int foo; 1803 #if defined(REAL_DMA_POLL) 1804 int cnt, toPIO; 1805 unsigned char saved_data = 0, overrun = 0, residue; 1806 #endif 1807 1808 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1809 1810 NCR5380_setup(instance); 1811 1812 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1813 *phase = tmp; 1814 return -1; 1815 } 1816 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1817 #ifdef READ_OVERRUNS 1818 if (p & SR_IO) { 1819 c -= 2; 1820 } 1821 #endif 1822 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); 1823 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1824 #endif 1825 1826 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1827 1828 #ifdef REAL_DMA 1829 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1830 #elif defined(REAL_DMA_POLL) 1831 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1832 #else 1833 /* 1834 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1835 * were not disabled for the duration of a single DMA transfer, from 1836 * before the setting of DMA mode to after transfer of the last byte. 1837 */ 1838 1839 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1840 spin_unlock_irq(instance->host_lock); 1841 #endif 1842 /* KLL May need eop and parity in 53c400 */ 1843 if (hostdata->flags & FLAG_NCR53C400) 1844 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | 1845 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | 1846 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1847 else 1848 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1849 #endif /* def REAL_DMA */ 1850 1851 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); 1852 1853 /* 1854 * On the PAS16 at least I/O recovery delays are not needed here. 1855 * Everyone else seems to want them. 1856 */ 1857 1858 if (p & SR_IO) { 1859 io_recovery_delay(1); 1860 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1861 } else { 1862 io_recovery_delay(1); 1863 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1864 io_recovery_delay(1); 1865 NCR5380_write(START_DMA_SEND_REG, 0); 1866 io_recovery_delay(1); 1867 } 1868 1869 #if defined(REAL_DMA_POLL) 1870 do { 1871 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1872 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1873 1874 /* 1875 At this point, either we've completed DMA, or we have a phase mismatch, 1876 or we've unexpectedly lost BUSY (which is a real error). 1877 1878 For write DMAs, we want to wait until the last byte has been 1879 transferred out over the bus before we turn off DMA mode. Alas, there 1880 seems to be no terribly good way of doing this on a 5380 under all 1881 conditions. For non-scatter-gather operations, we can wait until REQ 1882 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1883 are nastier, since the device will be expecting more data than we 1884 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1885 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1886 why this signal was added to the newer chips) but on the older 538[01] 1887 this signal does not exist. The workaround for this lack is a watchdog; 1888 we bail out of the wait-loop after a modest amount of wait-time if 1889 the usual exit conditions are not met. Not a terribly clean or 1890 correct solution :-% 1891 1892 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1893 If the chip is in DMA mode for an READ, it will respond to a target's 1894 REQ by latching the SCSI data into the INPUT DATA register and asserting 1895 ACK, even if it has _already_ been notified by the DMA controller that 1896 the current DMA transfer has completed! If the NCR5380 is then taken 1897 out of DMA mode, this already-acknowledged byte is lost. 1898 1899 This is not a problem for "one DMA transfer per command" reads, because 1900 the situation will never arise... either all of the data is DMA'ed 1901 properly, or the target switches to MESSAGE IN phase to signal a 1902 disconnection (either operation bringing the DMA to a clean halt). 1903 However, in order to handle scatter-reads, we must work around the 1904 problem. The chosen fix is to DMA N-2 bytes, then check for the 1905 condition before taking the NCR5380 out of DMA mode. One or two extra 1906 bytes are transferred via PIO as necessary to fill out the original 1907 request. 1908 */ 1909 1910 if (p & SR_IO) { 1911 #ifdef READ_OVERRUNS 1912 udelay(10); 1913 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1914 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1915 overrun = 1; 1916 } 1917 #endif 1918 } else { 1919 int limit = 100; 1920 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1921 if (!(tmp & BASR_PHASE_MATCH)) 1922 break; 1923 if (--limit < 0) 1924 break; 1925 } 1926 } 1927 1928 dprintk(NDEBUG_DMA, "scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)); 1929 1930 NCR5380_write(MODE_REG, MR_BASE); 1931 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1932 1933 residue = NCR5380_dma_residual(instance); 1934 c -= residue; 1935 *count -= c; 1936 *data += c; 1937 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1938 1939 #ifdef READ_OVERRUNS 1940 if (*phase == p && (p & SR_IO) && residue == 0) { 1941 if (overrun) { 1942 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); 1943 **data = saved_data; 1944 *data += 1; 1945 *count -= 1; 1946 cnt = toPIO = 1; 1947 } else { 1948 printk("No overrun??\n"); 1949 cnt = toPIO = 2; 1950 } 1951 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data); 1952 NCR5380_transfer_pio(instance, phase, &cnt, data); 1953 *count -= toPIO - cnt; 1954 } 1955 #endif 1956 1957 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)); 1958 return 0; 1959 1960 #elif defined(REAL_DMA) 1961 return 0; 1962 #else /* defined(REAL_DMA_POLL) */ 1963 if (p & SR_IO) { 1964 #ifdef DMA_WORKS_RIGHT 1965 foo = NCR5380_pread(instance, d, c); 1966 #else 1967 int diff = 1; 1968 if (hostdata->flags & FLAG_NCR53C400) { 1969 diff = 0; 1970 } 1971 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1972 /* 1973 * We can't disable DMA mode after successfully transferring 1974 * what we plan to be the last byte, since that would open up 1975 * a race condition where if the target asserted REQ before 1976 * we got the DMA mode reset, the NCR5380 would have latched 1977 * an additional byte into the INPUT DATA register and we'd 1978 * have dropped it. 1979 * 1980 * The workaround was to transfer one fewer bytes than we 1981 * intended to with the pseudo-DMA read function, wait for 1982 * the chip to latch the last byte, read it, and then disable 1983 * pseudo-DMA mode. 1984 * 1985 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 1986 * REQ is deasserted when ACK is asserted, and not reasserted 1987 * until ACK goes false. Since the NCR5380 won't lower ACK 1988 * until DACK is asserted, which won't happen unless we twiddle 1989 * the DMA port or we take the NCR5380 out of DMA mode, we 1990 * can guarantee that we won't handshake another extra 1991 * byte. 1992 */ 1993 1994 if (!(hostdata->flags & FLAG_NCR53C400)) { 1995 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 1996 /* Wait for clean handshake */ 1997 while (NCR5380_read(STATUS_REG) & SR_REQ); 1998 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 1999 } 2000 } 2001 #endif 2002 } else { 2003 #ifdef DMA_WORKS_RIGHT 2004 foo = NCR5380_pwrite(instance, d, c); 2005 #else 2006 int timeout; 2007 dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c); 2008 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2009 /* 2010 * Wait for the last byte to be sent. If REQ is being asserted for 2011 * the byte we're interested, we'll ACK it and it will go false. 2012 */ 2013 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2014 timeout = 20000; 2015 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2016 2017 if (!timeout) 2018 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no); 2019 2020 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2021 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2022 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2023 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2024 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no); 2025 } 2026 } 2027 } else { 2028 dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n"); 2029 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2030 dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n"); 2031 } 2032 } 2033 #endif 2034 } 2035 NCR5380_write(MODE_REG, MR_BASE); 2036 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2037 2038 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2039 dprintk(NDEBUG_C400_PWRITE, "53C400w: Checking for IRQ\n"); 2040 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2041 dprintk(NDEBUG_C400_PWRITE, "53C400w: got it, reading reset interrupt reg\n"); 2042 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2043 } else { 2044 printk("53C400w: IRQ NOT THERE!\n"); 2045 } 2046 } 2047 *data = d + c; 2048 *count = 0; 2049 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2050 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2051 spin_lock_irq(instance->host_lock); 2052 #endif /* defined(REAL_DMA_POLL) */ 2053 return foo; 2054 #endif /* def REAL_DMA */ 2055 } 2056 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2057 2058 /* 2059 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2060 * 2061 * Purpose : run through the various SCSI phases and do as the target 2062 * directs us to. Operates on the currently connected command, 2063 * instance->connected. 2064 * 2065 * Inputs : instance, instance for which we are doing commands 2066 * 2067 * Side effects : SCSI things happen, the disconnected queue will be 2068 * modified if a command disconnects, *instance->connected will 2069 * change. 2070 * 2071 * XXX Note : we need to watch for bus free or a reset condition here 2072 * to recover from an unexpected bus free condition. 2073 * 2074 * Locks: io_request_lock held by caller in IRQ mode 2075 */ 2076 2077 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2078 NCR5380_local_declare(); 2079 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2080 unsigned char msgout = NOP; 2081 int sink = 0; 2082 int len; 2083 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2084 int transfersize; 2085 #endif 2086 unsigned char *data; 2087 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2088 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2089 /* RvC: we need to set the end of the polling time */ 2090 unsigned long poll_time = jiffies + USLEEP_POLL; 2091 2092 NCR5380_setup(instance); 2093 2094 while (1) { 2095 tmp = NCR5380_read(STATUS_REG); 2096 /* We only have a valid SCSI phase when REQ is asserted */ 2097 if (tmp & SR_REQ) { 2098 phase = (tmp & PHASE_MASK); 2099 if (phase != old_phase) { 2100 old_phase = phase; 2101 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2102 } 2103 if (sink && (phase != PHASE_MSGOUT)) { 2104 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2105 2106 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2107 while (NCR5380_read(STATUS_REG) & SR_REQ); 2108 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2109 sink = 0; 2110 continue; 2111 } 2112 switch (phase) { 2113 case PHASE_DATAIN: 2114 case PHASE_DATAOUT: 2115 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2116 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2117 sink = 1; 2118 do_abort(instance); 2119 cmd->result = DID_ERROR << 16; 2120 cmd->scsi_done(cmd); 2121 return; 2122 #endif 2123 /* 2124 * If there is no room left in the current buffer in the 2125 * scatter-gather list, move onto the next one. 2126 */ 2127 2128 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2129 ++cmd->SCp.buffer; 2130 --cmd->SCp.buffers_residual; 2131 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2132 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 2133 dprintk(NDEBUG_INFORMATION, "scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual); 2134 } 2135 /* 2136 * The preferred transfer method is going to be 2137 * PSEUDO-DMA for systems that are strictly PIO, 2138 * since we can let the hardware do the handshaking. 2139 * 2140 * For this to work, we need to know the transfersize 2141 * ahead of time, since the pseudo-DMA code will sit 2142 * in an unconditional loop. 2143 */ 2144 2145 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2146 /* KLL 2147 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2148 * driver then it will always be defined, so the 2149 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2150 * NCR5380 case. I think this is a fairly clean solution. 2151 * We supplement these 2 if's with the flag. 2152 */ 2153 #ifdef NCR5380_dma_xfer_len 2154 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2155 #else 2156 transfersize = cmd->transfersize; 2157 2158 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2159 if (transfersize > 512) 2160 transfersize = 512; 2161 #endif /* LIMIT_TRANSFERSIZE */ 2162 2163 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2164 /* Limit transfers to 32K, for xx400 & xx406 2165 * pseudoDMA that transfers in 128 bytes blocks. */ 2166 if (transfersize > 32 * 1024) 2167 transfersize = 32 * 1024; 2168 #endif 2169 len = transfersize; 2170 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2171 /* 2172 * If the watchdog timer fires, all future accesses to this 2173 * device will use the polled-IO. 2174 */ 2175 scmd_printk(KERN_INFO, cmd, 2176 "switching to slow handshake\n"); 2177 cmd->device->borken = 1; 2178 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2179 sink = 1; 2180 do_abort(instance); 2181 cmd->result = DID_ERROR << 16; 2182 cmd->scsi_done(cmd); 2183 /* XXX - need to source or sink data here, as appropriate */ 2184 } else 2185 cmd->SCp.this_residual -= transfersize - len; 2186 } else 2187 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2188 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2189 &cmd->SCp.ptr); 2190 break; 2191 case PHASE_MSGIN: 2192 len = 1; 2193 data = &tmp; 2194 NCR5380_transfer_pio(instance, &phase, &len, &data); 2195 cmd->SCp.Message = tmp; 2196 2197 switch (tmp) { 2198 /* 2199 * Linking lets us reduce the time required to get the 2200 * next command out to the device, hopefully this will 2201 * mean we don't waste another revolution due to the delays 2202 * required by ARBITRATION and another SELECTION. 2203 * 2204 * In the current implementation proposal, low level drivers 2205 * merely have to start the next command, pointed to by 2206 * next_link, done() is called as with unlinked commands. 2207 */ 2208 #ifdef LINKED 2209 case LINKED_CMD_COMPLETE: 2210 case LINKED_FLG_CMD_COMPLETE: 2211 /* Accept message by clearing ACK */ 2212 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2213 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun); 2214 /* 2215 * Sanity check : A linked command should only terminate with 2216 * one of these messages if there are more linked commands 2217 * available. 2218 */ 2219 if (!cmd->next_link) { 2220 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2221 sink = 1; 2222 do_abort(instance); 2223 return; 2224 } 2225 initialize_SCp(cmd->next_link); 2226 /* The next command is still part of this process */ 2227 cmd->next_link->tag = cmd->tag; 2228 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2229 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); 2230 collect_stats(hostdata, cmd); 2231 cmd->scsi_done(cmd); 2232 cmd = hostdata->connected; 2233 break; 2234 #endif /* def LINKED */ 2235 case ABORT: 2236 case COMMAND_COMPLETE: 2237 /* Accept message by clearing ACK */ 2238 sink = 1; 2239 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2240 hostdata->connected = NULL; 2241 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun); 2242 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2243 2244 /* 2245 * I'm not sure what the correct thing to do here is : 2246 * 2247 * If the command that just executed is NOT a request 2248 * sense, the obvious thing to do is to set the result 2249 * code to the values of the stored parameters. 2250 * 2251 * If it was a REQUEST SENSE command, we need some way 2252 * to differentiate between the failure code of the original 2253 * and the failure code of the REQUEST sense - the obvious 2254 * case is success, where we fall through and leave the result 2255 * code unchanged. 2256 * 2257 * The non-obvious place is where the REQUEST SENSE failed 2258 */ 2259 2260 if (cmd->cmnd[0] != REQUEST_SENSE) 2261 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2262 else if (status_byte(cmd->SCp.Status) != GOOD) 2263 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2264 2265 #ifdef AUTOSENSE 2266 if ((cmd->cmnd[0] == REQUEST_SENSE) && 2267 hostdata->ses.cmd_len) { 2268 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 2269 hostdata->ses.cmd_len = 0 ; 2270 } 2271 2272 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2273 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); 2274 2275 dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no); 2276 2277 LIST(cmd, hostdata->issue_queue); 2278 cmd->host_scribble = (unsigned char *) 2279 hostdata->issue_queue; 2280 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2281 dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no); 2282 } else 2283 #endif /* def AUTOSENSE */ 2284 { 2285 collect_stats(hostdata, cmd); 2286 cmd->scsi_done(cmd); 2287 } 2288 2289 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2290 /* 2291 * Restore phase bits to 0 so an interrupted selection, 2292 * arbitration can resume. 2293 */ 2294 NCR5380_write(TARGET_COMMAND_REG, 0); 2295 2296 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2297 barrier(); 2298 return; 2299 case MESSAGE_REJECT: 2300 /* Accept message by clearing ACK */ 2301 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2302 switch (hostdata->last_message) { 2303 case HEAD_OF_QUEUE_TAG: 2304 case ORDERED_QUEUE_TAG: 2305 case SIMPLE_QUEUE_TAG: 2306 cmd->device->simple_tags = 0; 2307 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2308 break; 2309 default: 2310 break; 2311 } 2312 case DISCONNECT:{ 2313 /* Accept message by clearing ACK */ 2314 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2315 cmd->device->disconnect = 1; 2316 LIST(cmd, hostdata->disconnected_queue); 2317 cmd->host_scribble = (unsigned char *) 2318 hostdata->disconnected_queue; 2319 hostdata->connected = NULL; 2320 hostdata->disconnected_queue = cmd; 2321 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); 2322 /* 2323 * Restore phase bits to 0 so an interrupted selection, 2324 * arbitration can resume. 2325 */ 2326 NCR5380_write(TARGET_COMMAND_REG, 0); 2327 2328 /* Enable reselect interrupts */ 2329 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2330 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2331 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2332 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2333 barrier(); 2334 return; 2335 } 2336 /* 2337 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2338 * operation, in violation of the SCSI spec so we can safely 2339 * ignore SAVE/RESTORE pointers calls. 2340 * 2341 * Unfortunately, some disks violate the SCSI spec and 2342 * don't issue the required SAVE_POINTERS message before 2343 * disconnecting, and we have to break spec to remain 2344 * compatible. 2345 */ 2346 case SAVE_POINTERS: 2347 case RESTORE_POINTERS: 2348 /* Accept message by clearing ACK */ 2349 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2350 break; 2351 case EXTENDED_MESSAGE: 2352 /* 2353 * Extended messages are sent in the following format : 2354 * Byte 2355 * 0 EXTENDED_MESSAGE == 1 2356 * 1 length (includes one byte for code, doesn't 2357 * include first two bytes) 2358 * 2 code 2359 * 3..length+1 arguments 2360 * 2361 * Start the extended message buffer with the EXTENDED_MESSAGE 2362 * byte, since spi_print_msg() wants the whole thing. 2363 */ 2364 extended_msg[0] = EXTENDED_MESSAGE; 2365 /* Accept first byte by clearing ACK */ 2366 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2367 dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no); 2368 2369 len = 2; 2370 data = extended_msg + 1; 2371 phase = PHASE_MSGIN; 2372 NCR5380_transfer_pio(instance, &phase, &len, &data); 2373 2374 dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]); 2375 2376 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2377 /* Accept third byte by clearing ACK */ 2378 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2379 len = extended_msg[1] - 1; 2380 data = extended_msg + 3; 2381 phase = PHASE_MSGIN; 2382 2383 NCR5380_transfer_pio(instance, &phase, &len, &data); 2384 dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len); 2385 2386 switch (extended_msg[2]) { 2387 case EXTENDED_SDTR: 2388 case EXTENDED_WDTR: 2389 case EXTENDED_MODIFY_DATA_POINTER: 2390 case EXTENDED_EXTENDED_IDENTIFY: 2391 tmp = 0; 2392 } 2393 } else if (len) { 2394 printk("scsi%d: error receiving extended message\n", instance->host_no); 2395 tmp = 0; 2396 } else { 2397 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2398 tmp = 0; 2399 } 2400 /* Fall through to reject message */ 2401 2402 /* 2403 * If we get something weird that we aren't expecting, 2404 * reject it. 2405 */ 2406 default: 2407 if (!tmp) { 2408 printk("scsi%d: rejecting message ", instance->host_no); 2409 spi_print_msg(extended_msg); 2410 printk("\n"); 2411 } else if (tmp != EXTENDED_MESSAGE) 2412 scmd_printk(KERN_INFO, cmd, 2413 "rejecting unknown message %02x\n",tmp); 2414 else 2415 scmd_printk(KERN_INFO, cmd, 2416 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2417 2418 msgout = MESSAGE_REJECT; 2419 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2420 break; 2421 } /* switch (tmp) */ 2422 break; 2423 case PHASE_MSGOUT: 2424 len = 1; 2425 data = &msgout; 2426 hostdata->last_message = msgout; 2427 NCR5380_transfer_pio(instance, &phase, &len, &data); 2428 if (msgout == ABORT) { 2429 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2430 hostdata->connected = NULL; 2431 cmd->result = DID_ERROR << 16; 2432 collect_stats(hostdata, cmd); 2433 cmd->scsi_done(cmd); 2434 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2435 return; 2436 } 2437 msgout = NOP; 2438 break; 2439 case PHASE_CMDOUT: 2440 len = cmd->cmd_len; 2441 data = cmd->cmnd; 2442 /* 2443 * XXX for performance reasons, on machines with a 2444 * PSEUDO-DMA architecture we should probably 2445 * use the dma transfer function. 2446 */ 2447 NCR5380_transfer_pio(instance, &phase, &len, &data); 2448 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2449 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2450 dprintk(NDEBUG_USLEEP, "scsi%d : issued command, sleeping until %lu\n", instance->host_no, hostdata->time_expires); 2451 return; 2452 } 2453 break; 2454 case PHASE_STATIN: 2455 len = 1; 2456 data = &tmp; 2457 NCR5380_transfer_pio(instance, &phase, &len, &data); 2458 cmd->SCp.Status = tmp; 2459 break; 2460 default: 2461 printk("scsi%d : unknown phase\n", instance->host_no); 2462 NCR5380_dprint(NDEBUG_ANY, instance); 2463 } /* switch(phase) */ 2464 } /* if (tmp * SR_REQ) */ 2465 else { 2466 /* RvC: go to sleep if polling time expired 2467 */ 2468 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2469 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2470 dprintk(NDEBUG_USLEEP, "scsi%d : poll timed out, sleeping until %lu\n", instance->host_no, hostdata->time_expires); 2471 return; 2472 } 2473 } 2474 } /* while (1) */ 2475 } 2476 2477 /* 2478 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2479 * 2480 * Purpose : does reselection, initializing the instance->connected 2481 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2482 * nexus has been reestablished, 2483 * 2484 * Inputs : instance - this instance of the NCR5380. 2485 * 2486 * Locks: io_request_lock held by caller if IRQ driven 2487 */ 2488 2489 static void NCR5380_reselect(struct Scsi_Host *instance) { 2490 NCR5380_local_declare(); 2491 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2492 instance->hostdata; 2493 unsigned char target_mask; 2494 unsigned char lun, phase; 2495 int len; 2496 unsigned char msg[3]; 2497 unsigned char *data; 2498 Scsi_Cmnd *tmp = NULL, *prev; 2499 int abort = 0; 2500 NCR5380_setup(instance); 2501 2502 /* 2503 * Disable arbitration, etc. since the host adapter obviously 2504 * lost, and tell an interrupted NCR5380_select() to restart. 2505 */ 2506 2507 NCR5380_write(MODE_REG, MR_BASE); 2508 hostdata->restart_select = 1; 2509 2510 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2511 dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no); 2512 2513 /* 2514 * At this point, we have detected that our SCSI ID is on the bus, 2515 * SEL is true and BSY was false for at least one bus settle delay 2516 * (400 ns). 2517 * 2518 * We must assert BSY ourselves, until the target drops the SEL 2519 * signal. 2520 */ 2521 2522 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2523 2524 /* FIXME: timeout too long, must fail to workqueue */ 2525 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2526 abort = 1; 2527 2528 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2529 2530 /* 2531 * Wait for target to go into MSGIN. 2532 * FIXME: timeout needed and fail to work queeu 2533 */ 2534 2535 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2536 abort = 1; 2537 2538 len = 1; 2539 data = msg; 2540 phase = PHASE_MSGIN; 2541 NCR5380_transfer_pio(instance, &phase, &len, &data); 2542 2543 if (!(msg[0] & 0x80)) { 2544 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2545 spi_print_msg(msg); 2546 abort = 1; 2547 } else { 2548 /* Accept message by clearing ACK */ 2549 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2550 lun = (msg[0] & 0x07); 2551 2552 /* 2553 * We need to add code for SCSI-II to track which devices have 2554 * I_T_L_Q nexuses established, and which have simple I_T_L 2555 * nexuses so we can chose to do additional data transfer. 2556 */ 2557 2558 /* 2559 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2560 * just reestablished, and remove it from the disconnected queue. 2561 */ 2562 2563 2564 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2565 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2566 ) { 2567 if (prev) { 2568 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2569 prev->host_scribble = tmp->host_scribble; 2570 } else { 2571 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2572 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2573 } 2574 tmp->host_scribble = NULL; 2575 break; 2576 } 2577 if (!tmp) { 2578 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2579 /* 2580 * Since we have an established nexus that we can't do anything with, 2581 * we must abort it. 2582 */ 2583 abort = 1; 2584 } 2585 } 2586 2587 if (abort) { 2588 do_abort(instance); 2589 } else { 2590 hostdata->connected = tmp; 2591 dprintk(NDEBUG_RESELECTION, "scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->device->id, tmp->device->lun, tmp->tag); 2592 } 2593 } 2594 2595 /* 2596 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2597 * 2598 * Purpose : called by interrupt handler when DMA finishes or a phase 2599 * mismatch occurs (which would finish the DMA transfer). 2600 * 2601 * Inputs : instance - this instance of the NCR5380. 2602 * 2603 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2604 * nexus has been reestablished, on failure NULL is returned. 2605 */ 2606 2607 #ifdef REAL_DMA 2608 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2609 NCR5380_local_declare(); 2610 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2611 int transferred; 2612 NCR5380_setup(instance); 2613 2614 /* 2615 * XXX this might not be right. 2616 * 2617 * Wait for final byte to transfer, ie wait for ACK to go false. 2618 * 2619 * We should use the Last Byte Sent bit, unfortunately this is 2620 * not available on the 5380/5381 (only the various CMOS chips) 2621 * 2622 * FIXME: timeout, and need to handle long timeout/irq case 2623 */ 2624 2625 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2626 2627 NCR5380_write(MODE_REG, MR_BASE); 2628 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2629 2630 /* 2631 * The only places we should see a phase mismatch and have to send 2632 * data from the same set of pointers will be the data transfer 2633 * phases. So, residual, requested length are only important here. 2634 */ 2635 2636 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2637 transferred = instance->dmalen - NCR5380_dma_residual(); 2638 hostdata->connected->SCp.this_residual -= transferred; 2639 hostdata->connected->SCp.ptr += transferred; 2640 } 2641 } 2642 #endif /* def REAL_DMA */ 2643 2644 /* 2645 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2646 * 2647 * Purpose : abort a command 2648 * 2649 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2650 * host byte of the result field to, if zero DID_ABORTED is 2651 * used. 2652 * 2653 * Returns : 0 - success, -1 on failure. 2654 * 2655 * XXX - there is no way to abort the command that is currently 2656 * connected, you have to wait for it to complete. If this is 2657 * a problem, we could implement longjmp() / setjmp(), setjmp() 2658 * called where the loop started in NCR5380_main(). 2659 * 2660 * Locks: host lock taken by caller 2661 */ 2662 2663 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2664 NCR5380_local_declare(); 2665 struct Scsi_Host *instance = cmd->device->host; 2666 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2667 Scsi_Cmnd *tmp, **prev; 2668 2669 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2670 scsi_print_command(cmd); 2671 2672 NCR5380_print_status(instance); 2673 2674 NCR5380_setup(instance); 2675 2676 dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no); 2677 dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)); 2678 2679 #if 0 2680 /* 2681 * Case 1 : If the command is the currently executing command, 2682 * we'll set the aborted flag and return control so that 2683 * information transfer routine can exit cleanly. 2684 */ 2685 2686 if (hostdata->connected == cmd) { 2687 dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no); 2688 hostdata->aborted = 1; 2689 /* 2690 * We should perform BSY checking, and make sure we haven't slipped 2691 * into BUS FREE. 2692 */ 2693 2694 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2695 /* 2696 * Since we can't change phases until we've completed the current 2697 * handshake, we have to source or sink a byte of data if the current 2698 * phase is not MSGOUT. 2699 */ 2700 2701 /* 2702 * Return control to the executing NCR drive so we can clear the 2703 * aborted flag and get back into our main loop. 2704 */ 2705 2706 return 0; 2707 } 2708 #endif 2709 2710 /* 2711 * Case 2 : If the command hasn't been issued yet, we simply remove it 2712 * from the issue queue. 2713 */ 2714 2715 dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no); 2716 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) 2717 if (cmd == tmp) { 2718 REMOVE(5, *prev, tmp, tmp->host_scribble); 2719 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2720 tmp->host_scribble = NULL; 2721 tmp->result = DID_ABORT << 16; 2722 dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no); 2723 tmp->scsi_done(tmp); 2724 return SUCCESS; 2725 } 2726 #if (NDEBUG & NDEBUG_ABORT) 2727 /* KLL */ 2728 else if (prev == tmp) 2729 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2730 #endif 2731 2732 /* 2733 * Case 3 : If any commands are connected, we're going to fail the abort 2734 * and let the high level SCSI driver retry at a later time or 2735 * issue a reset. 2736 * 2737 * Timeouts, and therefore aborted commands, will be highly unlikely 2738 * and handling them cleanly in this situation would make the common 2739 * case of noresets less efficient, and would pollute our code. So, 2740 * we fail. 2741 */ 2742 2743 if (hostdata->connected) { 2744 dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no); 2745 return FAILED; 2746 } 2747 /* 2748 * Case 4: If the command is currently disconnected from the bus, and 2749 * there are no connected commands, we reconnect the I_T_L or 2750 * I_T_L_Q nexus associated with it, go into message out, and send 2751 * an abort message. 2752 * 2753 * This case is especially ugly. In order to reestablish the nexus, we 2754 * need to call NCR5380_select(). The easiest way to implement this 2755 * function was to abort if the bus was busy, and let the interrupt 2756 * handler triggered on the SEL for reselect take care of lost arbitrations 2757 * where necessary, meaning interrupts need to be enabled. 2758 * 2759 * When interrupts are enabled, the queues may change - so we 2760 * can't remove it from the disconnected queue before selecting it 2761 * because that could cause a failure in hashing the nexus if that 2762 * device reselected. 2763 * 2764 * Since the queues may change, we can't use the pointers from when we 2765 * first locate it. 2766 * 2767 * So, we must first locate the command, and if NCR5380_select() 2768 * succeeds, then issue the abort, relocate the command and remove 2769 * it from the disconnected queue. 2770 */ 2771 2772 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2773 if (cmd == tmp) { 2774 dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no); 2775 2776 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2777 return FAILED; 2778 dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no); 2779 2780 do_abort(instance); 2781 2782 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) 2783 if (cmd == tmp) { 2784 REMOVE(5, *prev, tmp, tmp->host_scribble); 2785 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2786 tmp->host_scribble = NULL; 2787 tmp->result = DID_ABORT << 16; 2788 tmp->scsi_done(tmp); 2789 return SUCCESS; 2790 } 2791 } 2792 /* 2793 * Case 5 : If we reached this point, the command was not found in any of 2794 * the queues. 2795 * 2796 * We probably reached this point because of an unlikely race condition 2797 * between the command completing successfully and the abortion code, 2798 * so we won't panic, but we will notify the user in case something really 2799 * broke. 2800 */ 2801 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2802 " before abortion\n", instance->host_no); 2803 return FAILED; 2804 } 2805 2806 2807 /* 2808 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2809 * 2810 * Purpose : reset the SCSI bus. 2811 * 2812 * Returns : SUCCESS 2813 * 2814 * Locks: host lock taken by caller 2815 */ 2816 2817 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2818 { 2819 struct Scsi_Host *instance = cmd->device->host; 2820 2821 NCR5380_local_declare(); 2822 NCR5380_setup(instance); 2823 NCR5380_print_status(instance); 2824 2825 spin_lock_irq(instance->host_lock); 2826 do_reset(instance); 2827 spin_unlock_irq(instance->host_lock); 2828 2829 return SUCCESS; 2830 } 2831