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 %llu\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=%llu\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] & 1045 (1 << (u8)(tmp->device->lun & 0xff)))) { 1046 if (prev) { 1047 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1048 prev->host_scribble = tmp->host_scribble; 1049 } else { 1050 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1051 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1052 } 1053 tmp->host_scribble = NULL; 1054 1055 /* 1056 * Attempt to establish an I_T_L nexus here. 1057 * On success, instance->hostdata->connected is set. 1058 * On failure, we must add the command back to the 1059 * issue queue so we can keep trying. 1060 */ 1061 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main() : command for target %d lun %llu removed from issue_queue\n", instance->host_no, tmp->device->id, tmp->device->lun); 1062 1063 /* 1064 * A successful selection is defined as one that 1065 * leaves us with the command connected and 1066 * in hostdata->connected, OR has terminated the 1067 * command. 1068 * 1069 * With successful commands, we fall through 1070 * and see if we can do an information transfer, 1071 * with failures we will restart. 1072 */ 1073 hostdata->selecting = NULL; 1074 /* RvC: have to preset this to indicate a new command is being performed */ 1075 1076 if (!NCR5380_select(instance, tmp, 1077 /* 1078 * REQUEST SENSE commands are issued without tagged 1079 * queueing, even on SCSI-II devices because the 1080 * contingent allegiance condition exists for the 1081 * entire unit. 1082 */ 1083 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1084 break; 1085 } else { 1086 LIST(tmp, hostdata->issue_queue); 1087 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1088 hostdata->issue_queue = tmp; 1089 done = 0; 1090 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, "scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no); 1091 } 1092 /* lock held here still */ 1093 } /* if target/lun is not busy */ 1094 } /* for */ 1095 /* exited locked */ 1096 } /* if (!hostdata->connected) */ 1097 if (hostdata->selecting) { 1098 tmp = (Scsi_Cmnd *) hostdata->selecting; 1099 /* Selection will drop and retake the lock */ 1100 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1101 /* Ok ?? */ 1102 } else { 1103 /* RvC: device failed, so we wait a long time 1104 this is needed for Mustek scanners, that 1105 do not respond to commands immediately 1106 after a scan */ 1107 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1108 LIST(tmp, hostdata->issue_queue); 1109 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1110 hostdata->issue_queue = tmp; 1111 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1112 } 1113 } /* if hostdata->selecting */ 1114 if (hostdata->connected 1115 #ifdef REAL_DMA 1116 && !hostdata->dmalen 1117 #endif 1118 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1119 ) { 1120 dprintk(NDEBUG_MAIN, "scsi%d : main() : performing information transfer\n", instance->host_no); 1121 NCR5380_information_transfer(instance); 1122 dprintk(NDEBUG_MAIN, "scsi%d : main() : done set false\n", instance->host_no); 1123 done = 0; 1124 } else 1125 break; 1126 } while (!done); 1127 1128 spin_unlock_irq(instance->host_lock); 1129 } 1130 1131 #ifndef DONT_USE_INTR 1132 1133 /** 1134 * NCR5380_intr - generic NCR5380 irq handler 1135 * @irq: interrupt number 1136 * @dev_id: device info 1137 * 1138 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1139 * from the disconnected queue, and restarting NCR5380_main() 1140 * as required. 1141 * 1142 * Locks: takes the needed instance locks 1143 */ 1144 1145 static irqreturn_t NCR5380_intr(int dummy, void *dev_id) 1146 { 1147 NCR5380_local_declare(); 1148 struct Scsi_Host *instance = dev_id; 1149 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1150 int done; 1151 unsigned char basr; 1152 unsigned long flags; 1153 1154 dprintk(NDEBUG_INTR, "scsi : NCR5380 irq %d triggered\n", 1155 instance->irq); 1156 1157 do { 1158 done = 1; 1159 spin_lock_irqsave(instance->host_lock, flags); 1160 /* Look for pending interrupts */ 1161 NCR5380_setup(instance); 1162 basr = NCR5380_read(BUS_AND_STATUS_REG); 1163 /* XXX dispatch to appropriate routine if found and done=0 */ 1164 if (basr & BASR_IRQ) { 1165 NCR5380_dprint(NDEBUG_INTR, instance); 1166 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1167 done = 0; 1168 dprintk(NDEBUG_INTR, "scsi%d : SEL interrupt\n", instance->host_no); 1169 NCR5380_reselect(instance); 1170 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1171 } else if (basr & BASR_PARITY_ERROR) { 1172 dprintk(NDEBUG_INTR, "scsi%d : PARITY interrupt\n", instance->host_no); 1173 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1174 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1175 dprintk(NDEBUG_INTR, "scsi%d : RESET interrupt\n", instance->host_no); 1176 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1177 } else { 1178 #if defined(REAL_DMA) 1179 /* 1180 * We should only get PHASE MISMATCH and EOP interrupts 1181 * if we have DMA enabled, so do a sanity check based on 1182 * the current setting of the MODE register. 1183 */ 1184 1185 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1186 int transferred; 1187 1188 if (!hostdata->connected) 1189 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1190 1191 transferred = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1192 hostdata->connected->SCp.this_residual -= transferred; 1193 hostdata->connected->SCp.ptr += transferred; 1194 hostdata->dmalen = 0; 1195 1196 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1197 1198 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1199 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1200 1201 NCR5380_write(MODE_REG, MR_BASE); 1202 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1203 } 1204 #else 1205 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)); 1206 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1207 #endif 1208 } 1209 } /* if BASR_IRQ */ 1210 spin_unlock_irqrestore(instance->host_lock, flags); 1211 if(!done) 1212 schedule_delayed_work(&hostdata->coroutine, 0); 1213 } while (!done); 1214 return IRQ_HANDLED; 1215 } 1216 1217 #endif 1218 1219 /** 1220 * collect_stats - collect stats on a scsi command 1221 * @hostdata: adapter 1222 * @cmd: command being issued 1223 * 1224 * Update the statistical data by parsing the command in question 1225 */ 1226 1227 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1228 { 1229 #ifdef NCR5380_STATS 1230 switch (cmd->cmnd[0]) { 1231 case WRITE: 1232 case WRITE_6: 1233 case WRITE_10: 1234 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1235 hostdata->pendingw--; 1236 break; 1237 case READ: 1238 case READ_6: 1239 case READ_10: 1240 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1241 hostdata->pendingr--; 1242 break; 1243 } 1244 #endif 1245 } 1246 1247 1248 /* 1249 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1250 * int tag); 1251 * 1252 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1253 * including ARBITRATION, SELECTION, and initial message out for 1254 * IDENTIFY and queue messages. 1255 * 1256 * Inputs : instance - instantiation of the 5380 driver on which this 1257 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1258 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1259 * the command that is presently connected. 1260 * 1261 * Returns : -1 if selection could not execute for some reason, 1262 * 0 if selection succeeded or failed because the target 1263 * did not respond. 1264 * 1265 * Side effects : 1266 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1267 * with registers as they should have been on entry - ie 1268 * SELECT_ENABLE will be set appropriately, the NCR5380 1269 * will cease to drive any SCSI bus signals. 1270 * 1271 * If successful : I_T_L or I_T_L_Q nexus will be established, 1272 * instance->connected will be set to cmd. 1273 * SELECT interrupt will be disabled. 1274 * 1275 * If failed (no target) : cmd->scsi_done() will be called, and the 1276 * cmd->result host byte set to DID_BAD_TARGET. 1277 * 1278 * Locks: caller holds hostdata lock in IRQ mode 1279 */ 1280 1281 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1282 { 1283 NCR5380_local_declare(); 1284 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1285 unsigned char tmp[3], phase; 1286 unsigned char *data; 1287 int len; 1288 unsigned long timeout; 1289 unsigned char value; 1290 int err; 1291 NCR5380_setup(instance); 1292 1293 if (hostdata->selecting) 1294 goto part2; 1295 1296 hostdata->restart_select = 0; 1297 1298 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1299 dprintk(NDEBUG_ARBITRATION, "scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id); 1300 1301 /* 1302 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1303 * data bus during SELECTION. 1304 */ 1305 1306 NCR5380_write(TARGET_COMMAND_REG, 0); 1307 1308 /* 1309 * Start arbitration. 1310 */ 1311 1312 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1313 NCR5380_write(MODE_REG, MR_ARBITRATE); 1314 1315 1316 /* We can be relaxed here, interrupts are on, we are 1317 in workqueue context, the birds are singing in the trees */ 1318 spin_unlock_irq(instance->host_lock); 1319 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1320 spin_lock_irq(instance->host_lock); 1321 if (err < 0) { 1322 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1323 NCR5380_write(MODE_REG, MR_BASE); 1324 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1325 goto failed; 1326 } 1327 1328 dprintk(NDEBUG_ARBITRATION, "scsi%d : arbitration complete\n", instance->host_no); 1329 1330 /* 1331 * The arbitration delay is 2.2us, but this is a minimum and there is 1332 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1333 * the integral nature of udelay(). 1334 * 1335 */ 1336 1337 udelay(3); 1338 1339 /* Check for lost arbitration */ 1340 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)) { 1341 NCR5380_write(MODE_REG, MR_BASE); 1342 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no); 1343 goto failed; 1344 } 1345 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1346 1347 if (!(hostdata->flags & FLAG_DTC3181E) && 1348 /* RvC: DTC3181E has some trouble with this 1349 * so we simply removed it. Seems to work with 1350 * only Mustek scanner attached 1351 */ 1352 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1353 NCR5380_write(MODE_REG, MR_BASE); 1354 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1355 dprintk(NDEBUG_ARBITRATION, "scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no); 1356 goto failed; 1357 } 1358 /* 1359 * Again, bus clear + bus settle time is 1.2us, however, this is 1360 * a minimum so we'll udelay ceil(1.2) 1361 */ 1362 1363 udelay(2); 1364 1365 dprintk(NDEBUG_ARBITRATION, "scsi%d : won arbitration\n", instance->host_no); 1366 1367 /* 1368 * Now that we have won arbitration, start Selection process, asserting 1369 * the host and target ID's on the SCSI bus. 1370 */ 1371 1372 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); 1373 1374 /* 1375 * Raise ATN while SEL is true before BSY goes false from arbitration, 1376 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1377 * phase immediately after selection. 1378 */ 1379 1380 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1381 NCR5380_write(MODE_REG, MR_BASE); 1382 1383 /* 1384 * Reselect interrupts must be turned off prior to the dropping of BSY, 1385 * otherwise we will trigger an interrupt. 1386 */ 1387 NCR5380_write(SELECT_ENABLE_REG, 0); 1388 1389 /* 1390 * The initiator shall then wait at least two deskew delays and release 1391 * the BSY signal. 1392 */ 1393 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1394 1395 /* Reset BSY */ 1396 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1397 1398 /* 1399 * Something weird happens when we cease to drive BSY - looks 1400 * like the board/chip is letting us do another read before the 1401 * appropriate propagation delay has expired, and we're confusing 1402 * a BSY signal from ourselves as the target's response to SELECTION. 1403 * 1404 * A small delay (the 'C++' frontend breaks the pipeline with an 1405 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1406 * tighter 'C' code breaks and requires this) solves the problem - 1407 * the 1 us delay is arbitrary, and only used because this delay will 1408 * be the same on other platforms and since it works here, it should 1409 * work there. 1410 * 1411 * wingel suggests that this could be due to failing to wait 1412 * one deskew delay. 1413 */ 1414 1415 udelay(1); 1416 1417 dprintk(NDEBUG_SELECTION, "scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd)); 1418 1419 /* 1420 * The SCSI specification calls for a 250 ms timeout for the actual 1421 * selection. 1422 */ 1423 1424 timeout = jiffies + (250 * HZ / 1000); 1425 1426 /* 1427 * XXX very interesting - we're seeing a bounce where the BSY we 1428 * asserted is being reflected / still asserted (propagation delay?) 1429 * and it's detecting as true. Sigh. 1430 */ 1431 1432 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1433 hostdata->selecting = cmd; 1434 1435 part2: 1436 /* RvC: here we enter after a sleeping period, or immediately after 1437 execution of part 1 1438 we poll only once ech clock tick */ 1439 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1440 1441 if (!value && (hostdata->select_time < HZ/4)) { 1442 /* RvC: we still must wait for a device response */ 1443 hostdata->select_time++; /* after 25 ticks the device has failed */ 1444 NCR5380_set_timer(hostdata, 1); 1445 return 0; /* RvC: we return here with hostdata->selecting set, 1446 to go to sleep */ 1447 } 1448 1449 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1450 waiting period */ 1451 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1452 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1453 NCR5380_reselect(instance); 1454 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1455 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1456 return -1; 1457 } 1458 /* 1459 * No less than two deskew delays after the initiator detects the 1460 * BSY signal is true, it shall release the SEL signal and may 1461 * change the DATA BUS. -wingel 1462 */ 1463 1464 udelay(1); 1465 1466 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1467 1468 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1469 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1470 if (hostdata->targets_present & (1 << scmd_id(cmd))) { 1471 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1472 if (hostdata->restart_select) 1473 printk(KERN_DEBUG "\trestart select\n"); 1474 NCR5380_dprint(NDEBUG_SELECTION, instance); 1475 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1476 return -1; 1477 } 1478 cmd->result = DID_BAD_TARGET << 16; 1479 collect_stats(hostdata, cmd); 1480 cmd->scsi_done(cmd); 1481 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1482 dprintk(NDEBUG_SELECTION, "scsi%d : target did not respond within 250ms\n", instance->host_no); 1483 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1484 return 0; 1485 } 1486 hostdata->targets_present |= (1 << scmd_id(cmd)); 1487 1488 /* 1489 * Since we followed the SCSI spec, and raised ATN while SEL 1490 * was true but before BSY was false during selection, the information 1491 * transfer phase should be a MESSAGE OUT phase so that we can send the 1492 * IDENTIFY message. 1493 * 1494 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1495 * message (2 bytes) with a tag ID that we increment with every command 1496 * until it wraps back to 0. 1497 * 1498 * XXX - it turns out that there are some broken SCSI-II devices, 1499 * which claim to support tagged queuing but fail when more than 1500 * some number of commands are issued at once. 1501 */ 1502 1503 /* Wait for start of REQ/ACK handshake */ 1504 1505 spin_unlock_irq(instance->host_lock); 1506 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1507 spin_lock_irq(instance->host_lock); 1508 1509 if(err) { 1510 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1511 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1512 goto failed; 1513 } 1514 1515 dprintk(NDEBUG_SELECTION, "scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id); 1516 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1517 1518 len = 1; 1519 cmd->tag = 0; 1520 1521 /* Send message(s) */ 1522 data = tmp; 1523 phase = PHASE_MSGOUT; 1524 NCR5380_transfer_pio(instance, &phase, &len, &data); 1525 dprintk(NDEBUG_SELECTION, "scsi%d : nexus established.\n", instance->host_no); 1526 /* XXX need to handle errors here */ 1527 hostdata->connected = cmd; 1528 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); 1529 1530 initialize_SCp(cmd); 1531 1532 return 0; 1533 1534 /* Selection failed */ 1535 failed: 1536 return -1; 1537 1538 } 1539 1540 /* 1541 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1542 * unsigned char *phase, int *count, unsigned char **data) 1543 * 1544 * Purpose : transfers data in given phase using polled I/O 1545 * 1546 * Inputs : instance - instance of driver, *phase - pointer to 1547 * what phase is expected, *count - pointer to number of 1548 * bytes to transfer, **data - pointer to data pointer. 1549 * 1550 * Returns : -1 when different phase is entered without transferring 1551 * maximum number of bytes, 0 if all bytes or transferred or exit 1552 * is in same phase. 1553 * 1554 * Also, *phase, *count, *data are modified in place. 1555 * 1556 * XXX Note : handling for bus free may be useful. 1557 */ 1558 1559 /* 1560 * Note : this code is not as quick as it could be, however it 1561 * IS 100% reliable, and for the actual data transfer where speed 1562 * counts, we will always do a pseudo DMA or DMA transfer. 1563 */ 1564 1565 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1566 NCR5380_local_declare(); 1567 unsigned char p = *phase, tmp; 1568 int c = *count; 1569 unsigned char *d = *data; 1570 /* 1571 * RvC: some administrative data to process polling time 1572 */ 1573 int break_allowed = 0; 1574 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1575 NCR5380_setup(instance); 1576 1577 if (!(p & SR_IO)) 1578 dprintk(NDEBUG_PIO, "scsi%d : pio write %d bytes\n", instance->host_no, c); 1579 else 1580 dprintk(NDEBUG_PIO, "scsi%d : pio read %d bytes\n", instance->host_no, c); 1581 1582 /* 1583 * The NCR5380 chip will only drive the SCSI bus when the 1584 * phase specified in the appropriate bits of the TARGET COMMAND 1585 * REGISTER match the STATUS REGISTER 1586 */ 1587 1588 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1589 1590 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1591 * so breaks are not necessary there 1592 */ 1593 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1594 break_allowed = 1; 1595 } 1596 do { 1597 /* 1598 * Wait for assertion of REQ, after which the phase bits will be 1599 * valid 1600 */ 1601 1602 /* RvC: we simply poll once, after that we stop temporarily 1603 * and let the device buffer fill up 1604 * if breaking is not allowed, we keep polling as long as needed 1605 */ 1606 1607 /* FIXME */ 1608 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1609 if (!(tmp & SR_REQ)) { 1610 /* timeout condition */ 1611 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1612 break; 1613 } 1614 1615 dprintk(NDEBUG_HANDSHAKE, "scsi%d : REQ detected\n", instance->host_no); 1616 1617 /* Check for phase mismatch */ 1618 if ((tmp & PHASE_MASK) != p) { 1619 dprintk(NDEBUG_HANDSHAKE, "scsi%d : phase mismatch\n", instance->host_no); 1620 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1621 break; 1622 } 1623 /* Do actual transfer from SCSI bus to / from memory */ 1624 if (!(p & SR_IO)) 1625 NCR5380_write(OUTPUT_DATA_REG, *d); 1626 else 1627 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1628 1629 ++d; 1630 1631 /* 1632 * The SCSI standard suggests that in MSGOUT phase, the initiator 1633 * should drop ATN on the last byte of the message phase 1634 * after REQ has been asserted for the handshake but before 1635 * the initiator raises ACK. 1636 */ 1637 1638 if (!(p & SR_IO)) { 1639 if (!((p & SR_MSG) && c > 1)) { 1640 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1641 NCR5380_dprint(NDEBUG_PIO, instance); 1642 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1643 } else { 1644 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1645 NCR5380_dprint(NDEBUG_PIO, instance); 1646 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1647 } 1648 } else { 1649 NCR5380_dprint(NDEBUG_PIO, instance); 1650 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1651 } 1652 1653 /* FIXME - if this fails bus reset ?? */ 1654 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1655 dprintk(NDEBUG_HANDSHAKE, "scsi%d : req false, handshake complete\n", instance->host_no); 1656 1657 /* 1658 * We have several special cases to consider during REQ/ACK handshaking : 1659 * 1. We were in MSGOUT phase, and we are on the last byte of the 1660 * message. ATN must be dropped as ACK is dropped. 1661 * 1662 * 2. We are in a MSGIN phase, and we are on the last byte of the 1663 * message. We must exit with ACK asserted, so that the calling 1664 * code may raise ATN before dropping ACK to reject the message. 1665 * 1666 * 3. ACK and ATN are clear and the target may proceed as normal. 1667 */ 1668 if (!(p == PHASE_MSGIN && c == 1)) { 1669 if (p == PHASE_MSGOUT && c > 1) 1670 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1671 else 1672 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1673 } 1674 } while (--c); 1675 1676 dprintk(NDEBUG_PIO, "scsi%d : residual %d\n", instance->host_no, c); 1677 1678 *count = c; 1679 *data = d; 1680 tmp = NCR5380_read(STATUS_REG); 1681 if (tmp & SR_REQ) 1682 *phase = tmp & PHASE_MASK; 1683 else 1684 *phase = PHASE_UNKNOWN; 1685 1686 if (!c || (*phase == p)) 1687 return 0; 1688 else 1689 return -1; 1690 } 1691 1692 /** 1693 * do_reset - issue a reset command 1694 * @host: adapter to reset 1695 * 1696 * Issue a reset sequence to the NCR5380 and try and get the bus 1697 * back into sane shape. 1698 * 1699 * Locks: caller holds queue lock 1700 */ 1701 1702 static void do_reset(struct Scsi_Host *host) { 1703 NCR5380_local_declare(); 1704 NCR5380_setup(host); 1705 1706 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1707 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1708 udelay(25); 1709 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1710 } 1711 1712 /* 1713 * Function : do_abort (Scsi_Host *host) 1714 * 1715 * Purpose : abort the currently established nexus. Should only be 1716 * called from a routine which can drop into a 1717 * 1718 * Returns : 0 on success, -1 on failure. 1719 * 1720 * Locks: queue lock held by caller 1721 * FIXME: sort this out and get new_eh running 1722 */ 1723 1724 static int do_abort(struct Scsi_Host *host) { 1725 NCR5380_local_declare(); 1726 unsigned char *msgptr, phase, tmp; 1727 int len; 1728 int rc; 1729 NCR5380_setup(host); 1730 1731 1732 /* Request message out phase */ 1733 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1734 1735 /* 1736 * Wait for the target to indicate a valid phase by asserting 1737 * REQ. Once this happens, we'll have either a MSGOUT phase 1738 * and can immediately send the ABORT message, or we'll have some 1739 * other phase and will have to source/sink data. 1740 * 1741 * We really don't care what value was on the bus or what value 1742 * the target sees, so we just handshake. 1743 */ 1744 1745 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1746 1747 if(rc < 0) 1748 return -1; 1749 1750 tmp = (unsigned char)rc; 1751 1752 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1753 1754 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1755 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1756 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1757 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1758 if(rc == -1) 1759 return -1; 1760 } 1761 tmp = ABORT; 1762 msgptr = &tmp; 1763 len = 1; 1764 phase = PHASE_MSGOUT; 1765 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1766 1767 /* 1768 * If we got here, and the command completed successfully, 1769 * we're about to go into bus free state. 1770 */ 1771 1772 return len ? -1 : 0; 1773 } 1774 1775 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1776 /* 1777 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1778 * unsigned char *phase, int *count, unsigned char **data) 1779 * 1780 * Purpose : transfers data in given phase using either real 1781 * or pseudo DMA. 1782 * 1783 * Inputs : instance - instance of driver, *phase - pointer to 1784 * what phase is expected, *count - pointer to number of 1785 * bytes to transfer, **data - pointer to data pointer. 1786 * 1787 * Returns : -1 when different phase is entered without transferring 1788 * maximum number of bytes, 0 if all bytes or transferred or exit 1789 * is in same phase. 1790 * 1791 * Also, *phase, *count, *data are modified in place. 1792 * 1793 * Locks: io_request lock held by caller 1794 */ 1795 1796 1797 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1798 NCR5380_local_declare(); 1799 register int c = *count; 1800 register unsigned char p = *phase; 1801 register unsigned char *d = *data; 1802 unsigned char tmp; 1803 int foo; 1804 #if defined(REAL_DMA_POLL) 1805 int cnt, toPIO; 1806 unsigned char saved_data = 0, overrun = 0, residue; 1807 #endif 1808 1809 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1810 1811 NCR5380_setup(instance); 1812 1813 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1814 *phase = tmp; 1815 return -1; 1816 } 1817 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1818 #ifdef READ_OVERRUNS 1819 if (p & SR_IO) { 1820 c -= 2; 1821 } 1822 #endif 1823 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); 1824 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1825 #endif 1826 1827 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1828 1829 #ifdef REAL_DMA 1830 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1831 #elif defined(REAL_DMA_POLL) 1832 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1833 #else 1834 /* 1835 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1836 * were not disabled for the duration of a single DMA transfer, from 1837 * before the setting of DMA mode to after transfer of the last byte. 1838 */ 1839 1840 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1841 spin_unlock_irq(instance->host_lock); 1842 #endif 1843 /* KLL May need eop and parity in 53c400 */ 1844 if (hostdata->flags & FLAG_NCR53C400) 1845 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | 1846 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | 1847 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1848 else 1849 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1850 #endif /* def REAL_DMA */ 1851 1852 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG)); 1853 1854 /* 1855 * On the PAS16 at least I/O recovery delays are not needed here. 1856 * Everyone else seems to want them. 1857 */ 1858 1859 if (p & SR_IO) { 1860 io_recovery_delay(1); 1861 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1862 } else { 1863 io_recovery_delay(1); 1864 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1865 io_recovery_delay(1); 1866 NCR5380_write(START_DMA_SEND_REG, 0); 1867 io_recovery_delay(1); 1868 } 1869 1870 #if defined(REAL_DMA_POLL) 1871 do { 1872 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1873 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1874 1875 /* 1876 At this point, either we've completed DMA, or we have a phase mismatch, 1877 or we've unexpectedly lost BUSY (which is a real error). 1878 1879 For write DMAs, we want to wait until the last byte has been 1880 transferred out over the bus before we turn off DMA mode. Alas, there 1881 seems to be no terribly good way of doing this on a 5380 under all 1882 conditions. For non-scatter-gather operations, we can wait until REQ 1883 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1884 are nastier, since the device will be expecting more data than we 1885 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1886 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1887 why this signal was added to the newer chips) but on the older 538[01] 1888 this signal does not exist. The workaround for this lack is a watchdog; 1889 we bail out of the wait-loop after a modest amount of wait-time if 1890 the usual exit conditions are not met. Not a terribly clean or 1891 correct solution :-% 1892 1893 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1894 If the chip is in DMA mode for an READ, it will respond to a target's 1895 REQ by latching the SCSI data into the INPUT DATA register and asserting 1896 ACK, even if it has _already_ been notified by the DMA controller that 1897 the current DMA transfer has completed! If the NCR5380 is then taken 1898 out of DMA mode, this already-acknowledged byte is lost. 1899 1900 This is not a problem for "one DMA transfer per command" reads, because 1901 the situation will never arise... either all of the data is DMA'ed 1902 properly, or the target switches to MESSAGE IN phase to signal a 1903 disconnection (either operation bringing the DMA to a clean halt). 1904 However, in order to handle scatter-reads, we must work around the 1905 problem. The chosen fix is to DMA N-2 bytes, then check for the 1906 condition before taking the NCR5380 out of DMA mode. One or two extra 1907 bytes are transferred via PIO as necessary to fill out the original 1908 request. 1909 */ 1910 1911 if (p & SR_IO) { 1912 #ifdef READ_OVERRUNS 1913 udelay(10); 1914 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1915 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1916 overrun = 1; 1917 } 1918 #endif 1919 } else { 1920 int limit = 100; 1921 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1922 if (!(tmp & BASR_PHASE_MATCH)) 1923 break; 1924 if (--limit < 0) 1925 break; 1926 } 1927 } 1928 1929 dprintk(NDEBUG_DMA, "scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG)); 1930 1931 NCR5380_write(MODE_REG, MR_BASE); 1932 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1933 1934 residue = NCR5380_dma_residual(instance); 1935 c -= residue; 1936 *count -= c; 1937 *data += c; 1938 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1939 1940 #ifdef READ_OVERRUNS 1941 if (*phase == p && (p & SR_IO) && residue == 0) { 1942 if (overrun) { 1943 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n"); 1944 **data = saved_data; 1945 *data += 1; 1946 *count -= 1; 1947 cnt = toPIO = 1; 1948 } else { 1949 printk("No overrun??\n"); 1950 cnt = toPIO = 2; 1951 } 1952 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data); 1953 NCR5380_transfer_pio(instance, phase, &cnt, data); 1954 *count -= toPIO - cnt; 1955 } 1956 #endif 1957 1958 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)); 1959 return 0; 1960 1961 #elif defined(REAL_DMA) 1962 return 0; 1963 #else /* defined(REAL_DMA_POLL) */ 1964 if (p & SR_IO) { 1965 #ifdef DMA_WORKS_RIGHT 1966 foo = NCR5380_pread(instance, d, c); 1967 #else 1968 int diff = 1; 1969 if (hostdata->flags & FLAG_NCR53C400) { 1970 diff = 0; 1971 } 1972 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1973 /* 1974 * We can't disable DMA mode after successfully transferring 1975 * what we plan to be the last byte, since that would open up 1976 * a race condition where if the target asserted REQ before 1977 * we got the DMA mode reset, the NCR5380 would have latched 1978 * an additional byte into the INPUT DATA register and we'd 1979 * have dropped it. 1980 * 1981 * The workaround was to transfer one fewer bytes than we 1982 * intended to with the pseudo-DMA read function, wait for 1983 * the chip to latch the last byte, read it, and then disable 1984 * pseudo-DMA mode. 1985 * 1986 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 1987 * REQ is deasserted when ACK is asserted, and not reasserted 1988 * until ACK goes false. Since the NCR5380 won't lower ACK 1989 * until DACK is asserted, which won't happen unless we twiddle 1990 * the DMA port or we take the NCR5380 out of DMA mode, we 1991 * can guarantee that we won't handshake another extra 1992 * byte. 1993 */ 1994 1995 if (!(hostdata->flags & FLAG_NCR53C400)) { 1996 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 1997 /* Wait for clean handshake */ 1998 while (NCR5380_read(STATUS_REG) & SR_REQ); 1999 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2000 } 2001 } 2002 #endif 2003 } else { 2004 #ifdef DMA_WORKS_RIGHT 2005 foo = NCR5380_pwrite(instance, d, c); 2006 #else 2007 int timeout; 2008 dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c); 2009 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2010 /* 2011 * Wait for the last byte to be sent. If REQ is being asserted for 2012 * the byte we're interested, we'll ACK it and it will go false. 2013 */ 2014 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2015 timeout = 20000; 2016 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2017 2018 if (!timeout) 2019 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no); 2020 2021 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2022 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2023 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2024 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2025 dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no); 2026 } 2027 } 2028 } else { 2029 dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n"); 2030 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2031 dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n"); 2032 } 2033 } 2034 #endif 2035 } 2036 NCR5380_write(MODE_REG, MR_BASE); 2037 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2038 2039 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2040 dprintk(NDEBUG_C400_PWRITE, "53C400w: Checking for IRQ\n"); 2041 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2042 dprintk(NDEBUG_C400_PWRITE, "53C400w: got it, reading reset interrupt reg\n"); 2043 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2044 } else { 2045 printk("53C400w: IRQ NOT THERE!\n"); 2046 } 2047 } 2048 *data = d + c; 2049 *count = 0; 2050 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2051 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2052 spin_lock_irq(instance->host_lock); 2053 #endif /* defined(REAL_DMA_POLL) */ 2054 return foo; 2055 #endif /* def REAL_DMA */ 2056 } 2057 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2058 2059 /* 2060 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2061 * 2062 * Purpose : run through the various SCSI phases and do as the target 2063 * directs us to. Operates on the currently connected command, 2064 * instance->connected. 2065 * 2066 * Inputs : instance, instance for which we are doing commands 2067 * 2068 * Side effects : SCSI things happen, the disconnected queue will be 2069 * modified if a command disconnects, *instance->connected will 2070 * change. 2071 * 2072 * XXX Note : we need to watch for bus free or a reset condition here 2073 * to recover from an unexpected bus free condition. 2074 * 2075 * Locks: io_request_lock held by caller in IRQ mode 2076 */ 2077 2078 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2079 NCR5380_local_declare(); 2080 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2081 unsigned char msgout = NOP; 2082 int sink = 0; 2083 int len; 2084 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2085 int transfersize; 2086 #endif 2087 unsigned char *data; 2088 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2089 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2090 /* RvC: we need to set the end of the polling time */ 2091 unsigned long poll_time = jiffies + USLEEP_POLL; 2092 2093 NCR5380_setup(instance); 2094 2095 while (1) { 2096 tmp = NCR5380_read(STATUS_REG); 2097 /* We only have a valid SCSI phase when REQ is asserted */ 2098 if (tmp & SR_REQ) { 2099 phase = (tmp & PHASE_MASK); 2100 if (phase != old_phase) { 2101 old_phase = phase; 2102 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2103 } 2104 if (sink && (phase != PHASE_MSGOUT)) { 2105 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2106 2107 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2108 while (NCR5380_read(STATUS_REG) & SR_REQ); 2109 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2110 sink = 0; 2111 continue; 2112 } 2113 switch (phase) { 2114 case PHASE_DATAIN: 2115 case PHASE_DATAOUT: 2116 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2117 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2118 sink = 1; 2119 do_abort(instance); 2120 cmd->result = DID_ERROR << 16; 2121 cmd->scsi_done(cmd); 2122 return; 2123 #endif 2124 /* 2125 * If there is no room left in the current buffer in the 2126 * scatter-gather list, move onto the next one. 2127 */ 2128 2129 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2130 ++cmd->SCp.buffer; 2131 --cmd->SCp.buffers_residual; 2132 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2133 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 2134 dprintk(NDEBUG_INFORMATION, "scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual); 2135 } 2136 /* 2137 * The preferred transfer method is going to be 2138 * PSEUDO-DMA for systems that are strictly PIO, 2139 * since we can let the hardware do the handshaking. 2140 * 2141 * For this to work, we need to know the transfersize 2142 * ahead of time, since the pseudo-DMA code will sit 2143 * in an unconditional loop. 2144 */ 2145 2146 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2147 /* KLL 2148 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2149 * driver then it will always be defined, so the 2150 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2151 * NCR5380 case. I think this is a fairly clean solution. 2152 * We supplement these 2 if's with the flag. 2153 */ 2154 #ifdef NCR5380_dma_xfer_len 2155 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2156 #else 2157 transfersize = cmd->transfersize; 2158 2159 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2160 if (transfersize > 512) 2161 transfersize = 512; 2162 #endif /* LIMIT_TRANSFERSIZE */ 2163 2164 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2165 /* Limit transfers to 32K, for xx400 & xx406 2166 * pseudoDMA that transfers in 128 bytes blocks. */ 2167 if (transfersize > 32 * 1024) 2168 transfersize = 32 * 1024; 2169 #endif 2170 len = transfersize; 2171 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2172 /* 2173 * If the watchdog timer fires, all future accesses to this 2174 * device will use the polled-IO. 2175 */ 2176 scmd_printk(KERN_INFO, cmd, 2177 "switching to slow handshake\n"); 2178 cmd->device->borken = 1; 2179 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2180 sink = 1; 2181 do_abort(instance); 2182 cmd->result = DID_ERROR << 16; 2183 cmd->scsi_done(cmd); 2184 /* XXX - need to source or sink data here, as appropriate */ 2185 } else 2186 cmd->SCp.this_residual -= transfersize - len; 2187 } else 2188 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2189 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2190 &cmd->SCp.ptr); 2191 break; 2192 case PHASE_MSGIN: 2193 len = 1; 2194 data = &tmp; 2195 NCR5380_transfer_pio(instance, &phase, &len, &data); 2196 cmd->SCp.Message = tmp; 2197 2198 switch (tmp) { 2199 /* 2200 * Linking lets us reduce the time required to get the 2201 * next command out to the device, hopefully this will 2202 * mean we don't waste another revolution due to the delays 2203 * required by ARBITRATION and another SELECTION. 2204 * 2205 * In the current implementation proposal, low level drivers 2206 * merely have to start the next command, pointed to by 2207 * next_link, done() is called as with unlinked commands. 2208 */ 2209 #ifdef LINKED 2210 case LINKED_CMD_COMPLETE: 2211 case LINKED_FLG_CMD_COMPLETE: 2212 /* Accept message by clearing ACK */ 2213 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2214 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun); 2215 /* 2216 * Sanity check : A linked command should only terminate with 2217 * one of these messages if there are more linked commands 2218 * available. 2219 */ 2220 if (!cmd->next_link) { 2221 printk("scsi%d : target %d lun %llu linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2222 sink = 1; 2223 do_abort(instance); 2224 return; 2225 } 2226 initialize_SCp(cmd->next_link); 2227 /* The next command is still part of this process */ 2228 cmd->next_link->tag = cmd->tag; 2229 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2230 dprintk(NDEBUG_LINKED, "scsi%d : target %d lun %llu linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun); 2231 collect_stats(hostdata, cmd); 2232 cmd->scsi_done(cmd); 2233 cmd = hostdata->connected; 2234 break; 2235 #endif /* def LINKED */ 2236 case ABORT: 2237 case COMMAND_COMPLETE: 2238 /* Accept message by clearing ACK */ 2239 sink = 1; 2240 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2241 hostdata->connected = NULL; 2242 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d, lun %llu completed\n", instance->host_no, cmd->device->id, cmd->device->lun); 2243 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); 2244 2245 /* 2246 * I'm not sure what the correct thing to do here is : 2247 * 2248 * If the command that just executed is NOT a request 2249 * sense, the obvious thing to do is to set the result 2250 * code to the values of the stored parameters. 2251 * 2252 * If it was a REQUEST SENSE command, we need some way 2253 * to differentiate between the failure code of the original 2254 * and the failure code of the REQUEST sense - the obvious 2255 * case is success, where we fall through and leave the result 2256 * code unchanged. 2257 * 2258 * The non-obvious place is where the REQUEST SENSE failed 2259 */ 2260 2261 if (cmd->cmnd[0] != REQUEST_SENSE) 2262 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2263 else if (status_byte(cmd->SCp.Status) != GOOD) 2264 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2265 2266 #ifdef AUTOSENSE 2267 if ((cmd->cmnd[0] == REQUEST_SENSE) && 2268 hostdata->ses.cmd_len) { 2269 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 2270 hostdata->ses.cmd_len = 0 ; 2271 } 2272 2273 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2274 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); 2275 2276 dprintk(NDEBUG_AUTOSENSE, "scsi%d : performing request sense\n", instance->host_no); 2277 2278 LIST(cmd, hostdata->issue_queue); 2279 cmd->host_scribble = (unsigned char *) 2280 hostdata->issue_queue; 2281 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2282 dprintk(NDEBUG_QUEUES, "scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no); 2283 } else 2284 #endif /* def AUTOSENSE */ 2285 { 2286 collect_stats(hostdata, cmd); 2287 cmd->scsi_done(cmd); 2288 } 2289 2290 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2291 /* 2292 * Restore phase bits to 0 so an interrupted selection, 2293 * arbitration can resume. 2294 */ 2295 NCR5380_write(TARGET_COMMAND_REG, 0); 2296 2297 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2298 barrier(); 2299 return; 2300 case MESSAGE_REJECT: 2301 /* Accept message by clearing ACK */ 2302 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2303 switch (hostdata->last_message) { 2304 case HEAD_OF_QUEUE_TAG: 2305 case ORDERED_QUEUE_TAG: 2306 case SIMPLE_QUEUE_TAG: 2307 cmd->device->simple_tags = 0; 2308 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); 2309 break; 2310 default: 2311 break; 2312 } 2313 case DISCONNECT:{ 2314 /* Accept message by clearing ACK */ 2315 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2316 cmd->device->disconnect = 1; 2317 LIST(cmd, hostdata->disconnected_queue); 2318 cmd->host_scribble = (unsigned char *) 2319 hostdata->disconnected_queue; 2320 hostdata->connected = NULL; 2321 hostdata->disconnected_queue = cmd; 2322 dprintk(NDEBUG_QUEUES, "scsi%d : command for target %d lun %llu was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun); 2323 /* 2324 * Restore phase bits to 0 so an interrupted selection, 2325 * arbitration can resume. 2326 */ 2327 NCR5380_write(TARGET_COMMAND_REG, 0); 2328 2329 /* Enable reselect interrupts */ 2330 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2331 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2332 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2333 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2334 barrier(); 2335 return; 2336 } 2337 /* 2338 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2339 * operation, in violation of the SCSI spec so we can safely 2340 * ignore SAVE/RESTORE pointers calls. 2341 * 2342 * Unfortunately, some disks violate the SCSI spec and 2343 * don't issue the required SAVE_POINTERS message before 2344 * disconnecting, and we have to break spec to remain 2345 * compatible. 2346 */ 2347 case SAVE_POINTERS: 2348 case RESTORE_POINTERS: 2349 /* Accept message by clearing ACK */ 2350 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2351 break; 2352 case EXTENDED_MESSAGE: 2353 /* 2354 * Extended messages are sent in the following format : 2355 * Byte 2356 * 0 EXTENDED_MESSAGE == 1 2357 * 1 length (includes one byte for code, doesn't 2358 * include first two bytes) 2359 * 2 code 2360 * 3..length+1 arguments 2361 * 2362 * Start the extended message buffer with the EXTENDED_MESSAGE 2363 * byte, since spi_print_msg() wants the whole thing. 2364 */ 2365 extended_msg[0] = EXTENDED_MESSAGE; 2366 /* Accept first byte by clearing ACK */ 2367 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2368 dprintk(NDEBUG_EXTENDED, "scsi%d : receiving extended message\n", instance->host_no); 2369 2370 len = 2; 2371 data = extended_msg + 1; 2372 phase = PHASE_MSGIN; 2373 NCR5380_transfer_pio(instance, &phase, &len, &data); 2374 2375 dprintk(NDEBUG_EXTENDED, "scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2]); 2376 2377 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2378 /* Accept third byte by clearing ACK */ 2379 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2380 len = extended_msg[1] - 1; 2381 data = extended_msg + 3; 2382 phase = PHASE_MSGIN; 2383 2384 NCR5380_transfer_pio(instance, &phase, &len, &data); 2385 dprintk(NDEBUG_EXTENDED, "scsi%d : message received, residual %d\n", instance->host_no, len); 2386 2387 switch (extended_msg[2]) { 2388 case EXTENDED_SDTR: 2389 case EXTENDED_WDTR: 2390 case EXTENDED_MODIFY_DATA_POINTER: 2391 case EXTENDED_EXTENDED_IDENTIFY: 2392 tmp = 0; 2393 } 2394 } else if (len) { 2395 printk("scsi%d: error receiving extended message\n", instance->host_no); 2396 tmp = 0; 2397 } else { 2398 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2399 tmp = 0; 2400 } 2401 /* Fall through to reject message */ 2402 2403 /* 2404 * If we get something weird that we aren't expecting, 2405 * reject it. 2406 */ 2407 default: 2408 if (!tmp) { 2409 printk("scsi%d: rejecting message ", instance->host_no); 2410 spi_print_msg(extended_msg); 2411 printk("\n"); 2412 } else if (tmp != EXTENDED_MESSAGE) 2413 scmd_printk(KERN_INFO, cmd, 2414 "rejecting unknown message %02x\n",tmp); 2415 else 2416 scmd_printk(KERN_INFO, cmd, 2417 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2418 2419 msgout = MESSAGE_REJECT; 2420 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2421 break; 2422 } /* switch (tmp) */ 2423 break; 2424 case PHASE_MSGOUT: 2425 len = 1; 2426 data = &msgout; 2427 hostdata->last_message = msgout; 2428 NCR5380_transfer_pio(instance, &phase, &len, &data); 2429 if (msgout == ABORT) { 2430 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xFF)); 2431 hostdata->connected = NULL; 2432 cmd->result = DID_ERROR << 16; 2433 collect_stats(hostdata, cmd); 2434 cmd->scsi_done(cmd); 2435 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2436 return; 2437 } 2438 msgout = NOP; 2439 break; 2440 case PHASE_CMDOUT: 2441 len = cmd->cmd_len; 2442 data = cmd->cmnd; 2443 /* 2444 * XXX for performance reasons, on machines with a 2445 * PSEUDO-DMA architecture we should probably 2446 * use the dma transfer function. 2447 */ 2448 NCR5380_transfer_pio(instance, &phase, &len, &data); 2449 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2450 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2451 dprintk(NDEBUG_USLEEP, "scsi%d : issued command, sleeping until %lu\n", instance->host_no, hostdata->time_expires); 2452 return; 2453 } 2454 break; 2455 case PHASE_STATIN: 2456 len = 1; 2457 data = &tmp; 2458 NCR5380_transfer_pio(instance, &phase, &len, &data); 2459 cmd->SCp.Status = tmp; 2460 break; 2461 default: 2462 printk("scsi%d : unknown phase\n", instance->host_no); 2463 NCR5380_dprint(NDEBUG_ANY, instance); 2464 } /* switch(phase) */ 2465 } /* if (tmp * SR_REQ) */ 2466 else { 2467 /* RvC: go to sleep if polling time expired 2468 */ 2469 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2470 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2471 dprintk(NDEBUG_USLEEP, "scsi%d : poll timed out, sleeping until %lu\n", instance->host_no, hostdata->time_expires); 2472 return; 2473 } 2474 } 2475 } /* while (1) */ 2476 } 2477 2478 /* 2479 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2480 * 2481 * Purpose : does reselection, initializing the instance->connected 2482 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2483 * nexus has been reestablished, 2484 * 2485 * Inputs : instance - this instance of the NCR5380. 2486 * 2487 * Locks: io_request_lock held by caller if IRQ driven 2488 */ 2489 2490 static void NCR5380_reselect(struct Scsi_Host *instance) { 2491 NCR5380_local_declare(); 2492 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2493 instance->hostdata; 2494 unsigned char target_mask; 2495 unsigned char lun, phase; 2496 int len; 2497 unsigned char msg[3]; 2498 unsigned char *data; 2499 Scsi_Cmnd *tmp = NULL, *prev; 2500 int abort = 0; 2501 NCR5380_setup(instance); 2502 2503 /* 2504 * Disable arbitration, etc. since the host adapter obviously 2505 * lost, and tell an interrupted NCR5380_select() to restart. 2506 */ 2507 2508 NCR5380_write(MODE_REG, MR_BASE); 2509 hostdata->restart_select = 1; 2510 2511 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2512 dprintk(NDEBUG_SELECTION, "scsi%d : reselect\n", instance->host_no); 2513 2514 /* 2515 * At this point, we have detected that our SCSI ID is on the bus, 2516 * SEL is true and BSY was false for at least one bus settle delay 2517 * (400 ns). 2518 * 2519 * We must assert BSY ourselves, until the target drops the SEL 2520 * signal. 2521 */ 2522 2523 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2524 2525 /* FIXME: timeout too long, must fail to workqueue */ 2526 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2527 abort = 1; 2528 2529 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2530 2531 /* 2532 * Wait for target to go into MSGIN. 2533 * FIXME: timeout needed and fail to work queeu 2534 */ 2535 2536 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2537 abort = 1; 2538 2539 len = 1; 2540 data = msg; 2541 phase = PHASE_MSGIN; 2542 NCR5380_transfer_pio(instance, &phase, &len, &data); 2543 2544 if (!(msg[0] & 0x80)) { 2545 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2546 spi_print_msg(msg); 2547 abort = 1; 2548 } else { 2549 /* Accept message by clearing ACK */ 2550 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2551 lun = (msg[0] & 0x07); 2552 2553 /* 2554 * We need to add code for SCSI-II to track which devices have 2555 * I_T_L_Q nexuses established, and which have simple I_T_L 2556 * nexuses so we can chose to do additional data transfer. 2557 */ 2558 2559 /* 2560 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2561 * just reestablished, and remove it from the disconnected queue. 2562 */ 2563 2564 2565 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2566 if ((target_mask == (1 << tmp->device->id)) && (lun == (u8)tmp->device->lun) 2567 ) { 2568 if (prev) { 2569 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2570 prev->host_scribble = tmp->host_scribble; 2571 } else { 2572 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2573 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2574 } 2575 tmp->host_scribble = NULL; 2576 break; 2577 } 2578 if (!tmp) { 2579 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2580 /* 2581 * Since we have an established nexus that we can't do anything with, 2582 * we must abort it. 2583 */ 2584 abort = 1; 2585 } 2586 } 2587 2588 if (abort) { 2589 do_abort(instance); 2590 } else { 2591 hostdata->connected = tmp; 2592 dprintk(NDEBUG_RESELECTION, "scsi%d : nexus established, target = %d, lun = %llu, tag = %d\n", instance->host_no, tmp->device->id, tmp->device->lun, tmp->tag); 2593 } 2594 } 2595 2596 /* 2597 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2598 * 2599 * Purpose : called by interrupt handler when DMA finishes or a phase 2600 * mismatch occurs (which would finish the DMA transfer). 2601 * 2602 * Inputs : instance - this instance of the NCR5380. 2603 * 2604 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2605 * nexus has been reestablished, on failure NULL is returned. 2606 */ 2607 2608 #ifdef REAL_DMA 2609 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2610 NCR5380_local_declare(); 2611 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2612 int transferred; 2613 NCR5380_setup(instance); 2614 2615 /* 2616 * XXX this might not be right. 2617 * 2618 * Wait for final byte to transfer, ie wait for ACK to go false. 2619 * 2620 * We should use the Last Byte Sent bit, unfortunately this is 2621 * not available on the 5380/5381 (only the various CMOS chips) 2622 * 2623 * FIXME: timeout, and need to handle long timeout/irq case 2624 */ 2625 2626 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2627 2628 NCR5380_write(MODE_REG, MR_BASE); 2629 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2630 2631 /* 2632 * The only places we should see a phase mismatch and have to send 2633 * data from the same set of pointers will be the data transfer 2634 * phases. So, residual, requested length are only important here. 2635 */ 2636 2637 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2638 transferred = instance->dmalen - NCR5380_dma_residual(); 2639 hostdata->connected->SCp.this_residual -= transferred; 2640 hostdata->connected->SCp.ptr += transferred; 2641 } 2642 } 2643 #endif /* def REAL_DMA */ 2644 2645 /* 2646 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2647 * 2648 * Purpose : abort a command 2649 * 2650 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2651 * host byte of the result field to, if zero DID_ABORTED is 2652 * used. 2653 * 2654 * Returns : 0 - success, -1 on failure. 2655 * 2656 * XXX - there is no way to abort the command that is currently 2657 * connected, you have to wait for it to complete. If this is 2658 * a problem, we could implement longjmp() / setjmp(), setjmp() 2659 * called where the loop started in NCR5380_main(). 2660 * 2661 * Locks: host lock taken by caller 2662 */ 2663 2664 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2665 NCR5380_local_declare(); 2666 struct Scsi_Host *instance = cmd->device->host; 2667 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2668 Scsi_Cmnd *tmp, **prev; 2669 2670 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2671 scsi_print_command(cmd); 2672 2673 NCR5380_print_status(instance); 2674 2675 NCR5380_setup(instance); 2676 2677 dprintk(NDEBUG_ABORT, "scsi%d : abort called\n", instance->host_no); 2678 dprintk(NDEBUG_ABORT, " basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG)); 2679 2680 #if 0 2681 /* 2682 * Case 1 : If the command is the currently executing command, 2683 * we'll set the aborted flag and return control so that 2684 * information transfer routine can exit cleanly. 2685 */ 2686 2687 if (hostdata->connected == cmd) { 2688 dprintk(NDEBUG_ABORT, "scsi%d : aborting connected command\n", instance->host_no); 2689 hostdata->aborted = 1; 2690 /* 2691 * We should perform BSY checking, and make sure we haven't slipped 2692 * into BUS FREE. 2693 */ 2694 2695 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2696 /* 2697 * Since we can't change phases until we've completed the current 2698 * handshake, we have to source or sink a byte of data if the current 2699 * phase is not MSGOUT. 2700 */ 2701 2702 /* 2703 * Return control to the executing NCR drive so we can clear the 2704 * aborted flag and get back into our main loop. 2705 */ 2706 2707 return 0; 2708 } 2709 #endif 2710 2711 /* 2712 * Case 2 : If the command hasn't been issued yet, we simply remove it 2713 * from the issue queue. 2714 */ 2715 2716 dprintk(NDEBUG_ABORT, "scsi%d : abort going into loop.\n", instance->host_no); 2717 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) 2718 if (cmd == tmp) { 2719 REMOVE(5, *prev, tmp, tmp->host_scribble); 2720 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2721 tmp->host_scribble = NULL; 2722 tmp->result = DID_ABORT << 16; 2723 dprintk(NDEBUG_ABORT, "scsi%d : abort removed command from issue queue.\n", instance->host_no); 2724 tmp->scsi_done(tmp); 2725 return SUCCESS; 2726 } 2727 #if (NDEBUG & NDEBUG_ABORT) 2728 /* KLL */ 2729 else if (prev == tmp) 2730 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2731 #endif 2732 2733 /* 2734 * Case 3 : If any commands are connected, we're going to fail the abort 2735 * and let the high level SCSI driver retry at a later time or 2736 * issue a reset. 2737 * 2738 * Timeouts, and therefore aborted commands, will be highly unlikely 2739 * and handling them cleanly in this situation would make the common 2740 * case of noresets less efficient, and would pollute our code. So, 2741 * we fail. 2742 */ 2743 2744 if (hostdata->connected) { 2745 dprintk(NDEBUG_ABORT, "scsi%d : abort failed, command connected.\n", instance->host_no); 2746 return FAILED; 2747 } 2748 /* 2749 * Case 4: If the command is currently disconnected from the bus, and 2750 * there are no connected commands, we reconnect the I_T_L or 2751 * I_T_L_Q nexus associated with it, go into message out, and send 2752 * an abort message. 2753 * 2754 * This case is especially ugly. In order to reestablish the nexus, we 2755 * need to call NCR5380_select(). The easiest way to implement this 2756 * function was to abort if the bus was busy, and let the interrupt 2757 * handler triggered on the SEL for reselect take care of lost arbitrations 2758 * where necessary, meaning interrupts need to be enabled. 2759 * 2760 * When interrupts are enabled, the queues may change - so we 2761 * can't remove it from the disconnected queue before selecting it 2762 * because that could cause a failure in hashing the nexus if that 2763 * device reselected. 2764 * 2765 * Since the queues may change, we can't use the pointers from when we 2766 * first locate it. 2767 * 2768 * So, we must first locate the command, and if NCR5380_select() 2769 * succeeds, then issue the abort, relocate the command and remove 2770 * it from the disconnected queue. 2771 */ 2772 2773 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2774 if (cmd == tmp) { 2775 dprintk(NDEBUG_ABORT, "scsi%d : aborting disconnected command.\n", instance->host_no); 2776 2777 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2778 return FAILED; 2779 dprintk(NDEBUG_ABORT, "scsi%d : nexus reestablished.\n", instance->host_no); 2780 2781 do_abort(instance); 2782 2783 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) 2784 if (cmd == tmp) { 2785 REMOVE(5, *prev, tmp, tmp->host_scribble); 2786 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2787 tmp->host_scribble = NULL; 2788 tmp->result = DID_ABORT << 16; 2789 tmp->scsi_done(tmp); 2790 return SUCCESS; 2791 } 2792 } 2793 /* 2794 * Case 5 : If we reached this point, the command was not found in any of 2795 * the queues. 2796 * 2797 * We probably reached this point because of an unlikely race condition 2798 * between the command completing successfully and the abortion code, 2799 * so we won't panic, but we will notify the user in case something really 2800 * broke. 2801 */ 2802 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2803 " before abortion\n", instance->host_no); 2804 return FAILED; 2805 } 2806 2807 2808 /* 2809 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2810 * 2811 * Purpose : reset the SCSI bus. 2812 * 2813 * Returns : SUCCESS 2814 * 2815 * Locks: host lock taken by caller 2816 */ 2817 2818 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2819 { 2820 struct Scsi_Host *instance = cmd->device->host; 2821 2822 NCR5380_local_declare(); 2823 NCR5380_setup(instance); 2824 NCR5380_print_status(instance); 2825 2826 spin_lock_irq(instance->host_lock); 2827 do_reset(instance); 2828 spin_unlock_irq(instance->host_lock); 2829 2830 return SUCCESS; 2831 } 2832