1 /* 2 * NCR 5380 generic driver routines. These should make it *trivial* 3 * to implement 5380 SCSI drivers under Linux with a non-trantor 4 * architecture. 5 * 6 * Note that these routines also work with NR53c400 family chips. 7 * 8 * Copyright 1993, Drew Eckhardt 9 * Visionary Computing 10 * (Unix and Linux consulting and custom programming) 11 * drew@colorado.edu 12 * +1 (303) 666-5836 13 * 14 * DISTRIBUTION RELEASE 6. 15 * 16 * For more information, please consult 17 * 18 * NCR 5380 Family 19 * SCSI Protocol Controller 20 * Databook 21 * 22 * NCR Microelectronics 23 * 1635 Aeroplaza Drive 24 * Colorado Springs, CO 80916 25 * 1+ (719) 578-3400 26 * 1+ (800) 334-5454 27 */ 28 29 /* 30 * $Log: NCR5380.c,v $ 31 32 * Revision 1.10 1998/9/2 Alan Cox 33 * (alan@lxorguk.ukuu.org.uk) 34 * Fixed up the timer lockups reported so far. Things still suck. Looking 35 * forward to 2.3 and per device request queues. Then it'll be possible to 36 * SMP thread this beast and improve life no end. 37 38 * Revision 1.9 1997/7/27 Ronald van Cuijlenborg 39 * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) 40 * (hopefully) fixed and enhanced USLEEP 41 * added support for DTC3181E card (for Mustek scanner) 42 * 43 44 * Revision 1.8 Ingmar Baumgart 45 * (ingmar@gonzo.schwaben.de) 46 * added support for NCR53C400a card 47 * 48 49 * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) 50 * added proc_info 51 * added support needed for DTC 3180/3280 52 * fixed a couple of bugs 53 * 54 55 * Revision 1.5 1994/01/19 09:14:57 drew 56 * Fixed udelay() hack that was being used on DATAOUT phases 57 * instead of a proper wait for the final handshake. 58 * 59 * Revision 1.4 1994/01/19 06:44:25 drew 60 * *** empty log message *** 61 * 62 * Revision 1.3 1994/01/19 05:24:40 drew 63 * Added support for TCR LAST_BYTE_SENT bit. 64 * 65 * Revision 1.2 1994/01/15 06:14:11 drew 66 * REAL DMA support, bug fixes. 67 * 68 * Revision 1.1 1994/01/15 06:00:54 drew 69 * Initial revision 70 * 71 */ 72 73 /* 74 * Further development / testing that should be done : 75 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete 76 * code so that everything does the same thing that's done at the 77 * end of a pseudo-DMA read operation. 78 * 79 * 2. Fix REAL_DMA (interrupt driven, polled works fine) - 80 * basically, transfer size needs to be reduced by one 81 * and the last byte read as is done with PSEUDO_DMA. 82 * 83 * 4. Test SCSI-II tagged queueing (I have no devices which support 84 * tagged queueing) 85 * 86 * 5. Test linked command handling code after Eric is ready with 87 * the high level code. 88 */ 89 #include <scsi/scsi_dbg.h> 90 #include <scsi/scsi_transport_spi.h> 91 92 #ifndef NDEBUG 93 #define NDEBUG 0 94 #endif 95 #ifndef NDEBUG_ABORT 96 #define NDEBUG_ABORT 0 97 #endif 98 99 #if (NDEBUG & NDEBUG_LISTS) 100 #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } 101 #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } 102 #else 103 #define LIST(x,y) 104 #define REMOVE(w,x,y,z) 105 #endif 106 107 #ifndef notyet 108 #undef LINKED 109 #undef REAL_DMA 110 #endif 111 112 #ifdef REAL_DMA_POLL 113 #undef READ_OVERRUNS 114 #define READ_OVERRUNS 115 #endif 116 117 #ifdef BOARD_REQUIRES_NO_DELAY 118 #define io_recovery_delay(x) 119 #else 120 #define io_recovery_delay(x) udelay(x) 121 #endif 122 123 /* 124 * Design 125 * 126 * This is a generic 5380 driver. To use it on a different platform, 127 * one simply writes appropriate system specific macros (ie, data 128 * transfer - some PC's will use the I/O bus, 68K's must use 129 * memory mapped) and drops this file in their 'C' wrapper. 130 * 131 * (Note from hch: unfortunately it was not enough for the different 132 * m68k folks and instead of improving this driver they copied it 133 * and hacked it up for their needs. As a consequence they lost 134 * most updates to this driver. Maybe someone will fix all these 135 * drivers to use a common core one day..) 136 * 137 * As far as command queueing, two queues are maintained for 138 * each 5380 in the system - commands that haven't been issued yet, 139 * and commands that are currently executing. This means that an 140 * unlimited number of commands may be queued, letting 141 * more commands propagate from the higher driver levels giving higher 142 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 143 * allowing multiple commands to propagate all the way to a SCSI-II device 144 * while a command is already executing. 145 * 146 * 147 * Issues specific to the NCR5380 : 148 * 149 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 150 * piece of hardware that requires you to sit in a loop polling for 151 * the REQ signal as long as you are connected. Some devices are 152 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 153 * while doing long seek operations. 154 * 155 * The workaround for this is to keep track of devices that have 156 * disconnected. If the device hasn't disconnected, for commands that 157 * should disconnect, we do something like 158 * 159 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } 160 * 161 * Some tweaking of N and M needs to be done. An algorithm based 162 * on "time to data" would give the best results as long as short time 163 * to datas (ie, on the same track) were considered, however these 164 * broken devices are the exception rather than the rule and I'd rather 165 * spend my time optimizing for the normal case. 166 * 167 * Architecture : 168 * 169 * At the heart of the design is a coroutine, NCR5380_main, 170 * which is started from a workqueue for each NCR5380 host in the 171 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by 172 * removing the commands from the issue queue and calling 173 * NCR5380_select() if a nexus is not established. 174 * 175 * Once a nexus is established, the NCR5380_information_transfer() 176 * phase goes through the various phases as instructed by the target. 177 * if the target goes into MSG IN and sends a DISCONNECT message, 178 * the command structure is placed into the per instance disconnected 179 * queue, and NCR5380_main tries to find more work. If the target is 180 * idle for too long, the system will try to sleep. 181 * 182 * If a command has disconnected, eventually an interrupt will trigger, 183 * calling NCR5380_intr() which will in turn call NCR5380_reselect 184 * to reestablish a nexus. This will run main if necessary. 185 * 186 * On command termination, the done function will be called as 187 * appropriate. 188 * 189 * SCSI pointers are maintained in the SCp field of SCSI command 190 * structures, being initialized after the command is connected 191 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 192 * Note that in violation of the standard, an implicit SAVE POINTERS operation 193 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 194 */ 195 196 /* 197 * Using this file : 198 * This file a skeleton Linux SCSI driver for the NCR 5380 series 199 * of chips. To use it, you write an architecture specific functions 200 * and macros and include this file in your driver. 201 * 202 * These macros control options : 203 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be 204 * defined. 205 * 206 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 207 * for commands that return with a CHECK CONDITION status. 208 * 209 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential 210 * transceivers. 211 * 212 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or 213 * override-configure an IRQ. 214 * 215 * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 216 * bytes at a time. Since interrupts are disabled by default during 217 * these transfers, we might need this to give reasonable interrupt 218 * service time if the transfer size gets too large. 219 * 220 * LINKED - if defined, linked commands are supported. 221 * 222 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. 223 * 224 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 225 * 226 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't 227 * rely on phase mismatch and EOP interrupts to determine end 228 * of phase. 229 * 230 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You 231 * only really want to use this if you're having a problem with 232 * dropped characters during high speed communications, and even 233 * then, you're going to be better off twiddling with transfersize 234 * in the high level code. 235 * 236 * Defaults for these will be provided although the user may want to adjust 237 * these to allocate CPU resources to the SCSI driver or "real" code. 238 * 239 * USLEEP_SLEEP - amount of time, in jiffies, to sleep 240 * 241 * USLEEP_POLL - amount of time, in jiffies, to poll 242 * 243 * These macros MUST be defined : 244 * NCR5380_local_declare() - declare any local variables needed for your 245 * transfer routines. 246 * 247 * NCR5380_setup(instance) - initialize any local variables needed from a given 248 * instance of the host adapter for NCR5380_{read,write,pread,pwrite} 249 * 250 * NCR5380_read(register) - read from the specified register 251 * 252 * NCR5380_write(register, value) - write to the specific register 253 * 254 * NCR5380_implementation_fields - additional fields needed for this 255 * specific implementation of the NCR5380 256 * 257 * Either real DMA *or* pseudo DMA may be implemented 258 * REAL functions : 259 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 260 * Note that the DMA setup functions should return the number of bytes 261 * that they were able to program the controller for. 262 * 263 * Also note that generic i386/PC versions of these macros are 264 * available as NCR5380_i386_dma_write_setup, 265 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 266 * 267 * NCR5380_dma_write_setup(instance, src, count) - initialize 268 * NCR5380_dma_read_setup(instance, dst, count) - initialize 269 * NCR5380_dma_residual(instance); - residual count 270 * 271 * PSEUDO functions : 272 * NCR5380_pwrite(instance, src, count) 273 * NCR5380_pread(instance, dst, count); 274 * 275 * The generic driver is initialized by calling NCR5380_init(instance), 276 * after setting the appropriate host specific fields and ID. If the 277 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 278 * possible) function may be used. 279 */ 280 281 static int do_abort(struct Scsi_Host *host); 282 static void do_reset(struct Scsi_Host *host); 283 284 /* 285 * initialize_SCp - init the scsi pointer field 286 * @cmd: command block to set up 287 * 288 * Set up the internal fields in the SCSI command. 289 */ 290 291 static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) 292 { 293 /* 294 * Initialize the Scsi Pointer field so that all of the commands in the 295 * various queues are valid. 296 */ 297 298 if (scsi_bufflen(cmd)) { 299 cmd->SCp.buffer = scsi_sglist(cmd); 300 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1; 301 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 302 cmd->SCp.this_residual = cmd->SCp.buffer->length; 303 } else { 304 cmd->SCp.buffer = NULL; 305 cmd->SCp.buffers_residual = 0; 306 cmd->SCp.ptr = NULL; 307 cmd->SCp.this_residual = 0; 308 } 309 } 310 311 /** 312 * NCR5380_poll_politely - wait for NCR5380 status bits 313 * @instance: controller to poll 314 * @reg: 5380 register to poll 315 * @bit: Bitmask to check 316 * @val: Value required to exit 317 * 318 * Polls the NCR5380 in a reasonably efficient manner waiting for 319 * an event to occur, after a short quick poll we begin giving the 320 * CPU back in non IRQ contexts 321 * 322 * Returns the value of the register or a negative error code. 323 */ 324 325 static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) 326 { 327 NCR5380_local_declare(); 328 int n = 500; /* At about 8uS a cycle for the cpu access */ 329 unsigned long end = jiffies + t; 330 int r; 331 332 NCR5380_setup(instance); 333 334 while( n-- > 0) 335 { 336 r = NCR5380_read(reg); 337 if((r & bit) == val) 338 return 0; 339 cpu_relax(); 340 } 341 342 /* t time yet ? */ 343 while(time_before(jiffies, end)) 344 { 345 r = NCR5380_read(reg); 346 if((r & bit) == val) 347 return 0; 348 if(!in_interrupt()) 349 cond_resched(); 350 else 351 cpu_relax(); 352 } 353 return -ETIMEDOUT; 354 } 355 356 static struct { 357 unsigned char value; 358 const char *name; 359 } phases[] __maybe_unused = { 360 {PHASE_DATAOUT, "DATAOUT"}, 361 {PHASE_DATAIN, "DATAIN"}, 362 {PHASE_CMDOUT, "CMDOUT"}, 363 {PHASE_STATIN, "STATIN"}, 364 {PHASE_MSGOUT, "MSGOUT"}, 365 {PHASE_MSGIN, "MSGIN"}, 366 {PHASE_UNKNOWN, "UNKNOWN"} 367 }; 368 369 #if NDEBUG 370 static struct { 371 unsigned char mask; 372 const char *name; 373 } signals[] = { 374 {SR_DBP, "PARITY"}, 375 {SR_RST, "RST"}, 376 {SR_BSY, "BSY"}, 377 {SR_REQ, "REQ"}, 378 {SR_MSG, "MSG"}, 379 {SR_CD, "CD"}, 380 {SR_IO, "IO"}, 381 {SR_SEL, "SEL"}, 382 {0, NULL} 383 }, 384 basrs[] = { 385 {BASR_ATN, "ATN"}, 386 {BASR_ACK, "ACK"}, 387 {0, NULL} 388 }, 389 icrs[] = { 390 {ICR_ASSERT_RST, "ASSERT RST"}, 391 {ICR_ASSERT_ACK, "ASSERT ACK"}, 392 {ICR_ASSERT_BSY, "ASSERT BSY"}, 393 {ICR_ASSERT_SEL, "ASSERT SEL"}, 394 {ICR_ASSERT_ATN, "ASSERT ATN"}, 395 {ICR_ASSERT_DATA, "ASSERT DATA"}, 396 {0, NULL} 397 }, 398 mrs[] = { 399 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, 400 {MR_TARGET, "MODE TARGET"}, 401 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, 402 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, 403 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 404 {MR_DMA_MODE, "MODE DMA"}, 405 {MR_ARBITRATE, "MODE ARBITRATION"}, 406 {0, NULL} 407 }; 408 409 /** 410 * NCR5380_print - print scsi bus signals 411 * @instance: adapter state to dump 412 * 413 * Print the SCSI bus signals for debugging purposes 414 * 415 * Locks: caller holds hostdata lock (not essential) 416 */ 417 418 static void NCR5380_print(struct Scsi_Host *instance) 419 { 420 NCR5380_local_declare(); 421 unsigned char status, data, basr, mr, icr, i; 422 NCR5380_setup(instance); 423 424 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 425 status = NCR5380_read(STATUS_REG); 426 mr = NCR5380_read(MODE_REG); 427 icr = NCR5380_read(INITIATOR_COMMAND_REG); 428 basr = NCR5380_read(BUS_AND_STATUS_REG); 429 430 printk("STATUS_REG: %02x ", status); 431 for (i = 0; signals[i].mask; ++i) 432 if (status & signals[i].mask) 433 printk(",%s", signals[i].name); 434 printk("\nBASR: %02x ", basr); 435 for (i = 0; basrs[i].mask; ++i) 436 if (basr & basrs[i].mask) 437 printk(",%s", basrs[i].name); 438 printk("\nICR: %02x ", icr); 439 for (i = 0; icrs[i].mask; ++i) 440 if (icr & icrs[i].mask) 441 printk(",%s", icrs[i].name); 442 printk("\nMODE: %02x ", mr); 443 for (i = 0; mrs[i].mask; ++i) 444 if (mr & mrs[i].mask) 445 printk(",%s", mrs[i].name); 446 printk("\n"); 447 } 448 449 450 /* 451 * NCR5380_print_phase - show SCSI phase 452 * @instance: adapter to dump 453 * 454 * Print the current SCSI phase for debugging purposes 455 * 456 * Locks: none 457 */ 458 459 static void NCR5380_print_phase(struct Scsi_Host *instance) 460 { 461 NCR5380_local_declare(); 462 unsigned char status; 463 int i; 464 NCR5380_setup(instance); 465 466 status = NCR5380_read(STATUS_REG); 467 if (!(status & SR_REQ)) 468 printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); 469 else { 470 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); 471 printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); 472 } 473 } 474 #endif 475 476 /* 477 * These need tweaking, and would probably work best as per-device 478 * flags initialized differently for disk, tape, cd, etc devices. 479 * People with broken devices are free to experiment as to what gives 480 * the best results for them. 481 * 482 * USLEEP_SLEEP should be a minimum seek time. 483 * 484 * USLEEP_POLL should be a maximum rotational latency. 485 */ 486 #ifndef USLEEP_SLEEP 487 /* 20 ms (reasonable hard disk speed) */ 488 #define USLEEP_SLEEP (20*HZ/1000) 489 #endif 490 /* 300 RPM (floppy speed) */ 491 #ifndef USLEEP_POLL 492 #define USLEEP_POLL (200*HZ/1000) 493 #endif 494 #ifndef USLEEP_WAITLONG 495 /* RvC: (reasonable time to wait on select error) */ 496 #define USLEEP_WAITLONG USLEEP_SLEEP 497 #endif 498 499 /* 500 * Function : int should_disconnect (unsigned char cmd) 501 * 502 * Purpose : decide whether a command would normally disconnect or 503 * not, since if it won't disconnect we should go to sleep. 504 * 505 * Input : cmd - opcode of SCSI command 506 * 507 * Returns : DISCONNECT_LONG if we should disconnect for a really long 508 * time (ie always, sleep, look for REQ active, sleep), 509 * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal 510 * time-to-data delay, DISCONNECT_NONE if this command would return 511 * immediately. 512 * 513 * Future sleep algorithms based on time to data can exploit 514 * something like this so they can differentiate between "normal" 515 * (ie, read, write, seek) and unusual commands (ie, * format). 516 * 517 * Note : We don't deal with commands that handle an immediate disconnect, 518 * 519 */ 520 521 static int should_disconnect(unsigned char cmd) 522 { 523 switch (cmd) { 524 case READ_6: 525 case WRITE_6: 526 case SEEK_6: 527 case READ_10: 528 case WRITE_10: 529 case SEEK_10: 530 return DISCONNECT_TIME_TO_DATA; 531 case FORMAT_UNIT: 532 case SEARCH_HIGH: 533 case SEARCH_LOW: 534 case SEARCH_EQUAL: 535 return DISCONNECT_LONG; 536 default: 537 return DISCONNECT_NONE; 538 } 539 } 540 541 static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) 542 { 543 hostdata->time_expires = jiffies + timeout; 544 schedule_delayed_work(&hostdata->coroutine, timeout); 545 } 546 547 548 static int probe_irq __initdata = 0; 549 550 /** 551 * probe_intr - helper for IRQ autoprobe 552 * @irq: interrupt number 553 * @dev_id: unused 554 * @regs: unused 555 * 556 * Set a flag to indicate the IRQ in question was received. This is 557 * used by the IRQ probe code. 558 */ 559 560 static irqreturn_t __init probe_intr(int irq, void *dev_id) 561 { 562 probe_irq = irq; 563 return IRQ_HANDLED; 564 } 565 566 /** 567 * NCR5380_probe_irq - find the IRQ of an NCR5380 568 * @instance: NCR5380 controller 569 * @possible: bitmask of ISA IRQ lines 570 * 571 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ 572 * and then looking to see what interrupt actually turned up. 573 * 574 * Locks: none, irqs must be enabled on entry 575 */ 576 577 static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance, 578 int possible) 579 { 580 NCR5380_local_declare(); 581 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 582 unsigned long timeout; 583 int trying_irqs, i, mask; 584 NCR5380_setup(instance); 585 586 for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) 587 if ((mask & possible) && (request_irq(i, &probe_intr, IRQF_DISABLED, "NCR-probe", NULL) == 0)) 588 trying_irqs |= mask; 589 590 timeout = jiffies + (250 * HZ / 1000); 591 probe_irq = SCSI_IRQ_NONE; 592 593 /* 594 * A interrupt is triggered whenever BSY = false, SEL = true 595 * and a bit set in the SELECT_ENABLE_REG is asserted on the 596 * SCSI bus. 597 * 598 * Note that the bus is only driven when the phase control signals 599 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that 600 * to zero. 601 */ 602 603 NCR5380_write(TARGET_COMMAND_REG, 0); 604 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 605 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 606 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); 607 608 while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) 609 schedule_timeout_uninterruptible(1); 610 611 NCR5380_write(SELECT_ENABLE_REG, 0); 612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 613 614 for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) 615 if (trying_irqs & mask) 616 free_irq(i, NULL); 617 618 return probe_irq; 619 } 620 621 /** 622 * NCR58380_print_options - show options 623 * @instance: unused for now 624 * 625 * Called by probe code indicating the NCR5380 driver options that 626 * were selected. At some point this will switch to runtime options 627 * read from the adapter in question 628 * 629 * Locks: none 630 */ 631 632 static void __init __maybe_unused 633 NCR5380_print_options(struct Scsi_Host *instance) 634 { 635 printk(" generic options" 636 #ifdef AUTOPROBE_IRQ 637 " AUTOPROBE_IRQ" 638 #endif 639 #ifdef AUTOSENSE 640 " AUTOSENSE" 641 #endif 642 #ifdef DIFFERENTIAL 643 " DIFFERENTIAL" 644 #endif 645 #ifdef REAL_DMA 646 " REAL DMA" 647 #endif 648 #ifdef REAL_DMA_POLL 649 " REAL DMA POLL" 650 #endif 651 #ifdef PARITY 652 " PARITY" 653 #endif 654 #ifdef PSEUDO_DMA 655 " PSEUDO DMA" 656 #endif 657 #ifdef UNSAFE 658 " UNSAFE " 659 #endif 660 ); 661 printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); 662 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 663 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { 664 printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); 665 } 666 } 667 668 /** 669 * NCR5380_print_status - dump controller info 670 * @instance: controller to dump 671 * 672 * Print commands in the various queues, called from NCR5380_abort 673 * and NCR5380_debug to aid debugging. 674 * 675 * Locks: called functions disable irqs 676 */ 677 678 static void NCR5380_print_status(struct Scsi_Host *instance) 679 { 680 NCR5380_dprint(NDEBUG_ANY, instance); 681 NCR5380_dprint_phase(NDEBUG_ANY, instance); 682 } 683 684 /******************************************/ 685 /* 686 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 687 * 688 * *buffer: I/O buffer 689 * **start: if inout == FALSE pointer into buffer where user read should start 690 * offset: current offset 691 * length: length of buffer 692 * hostno: Scsi_Host host_no 693 * inout: TRUE - user is writing; FALSE - user is reading 694 * 695 * Return the number of bytes read from or written 696 */ 697 698 static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance, 699 char *buffer, int length) 700 { 701 #ifdef DTC_PUBLIC_RELEASE 702 dtc_wmaxi = dtc_maxi = 0; 703 #endif 704 #ifdef PAS16_PUBLIC_RELEASE 705 pas_wmaxi = pas_maxi = 0; 706 #endif 707 return (-ENOSYS); /* Currently this is a no-op */ 708 } 709 710 #undef SPRINTF 711 #define SPRINTF(args...) seq_printf(m, ## args) 712 static 713 void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m); 714 static 715 void lprint_command(unsigned char *cmd, struct seq_file *m); 716 static 717 void lprint_opcode(int opcode, struct seq_file *m); 718 719 static int __maybe_unused NCR5380_show_info(struct seq_file *m, 720 struct Scsi_Host *instance) 721 { 722 struct NCR5380_hostdata *hostdata; 723 Scsi_Cmnd *ptr; 724 725 hostdata = (struct NCR5380_hostdata *) instance->hostdata; 726 727 SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); 728 if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) 729 SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); 730 #ifdef DTC_PUBLIC_RELEASE 731 SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); 732 #endif 733 #ifdef T128_PUBLIC_RELEASE 734 SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); 735 #endif 736 #ifdef GENERIC_NCR5380_PUBLIC_RELEASE 737 SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); 738 #endif 739 #ifdef PAS16_PUBLIC_RELEASE 740 SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); 741 #endif 742 743 SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); 744 SPRINTF("io_port: %04x ", (int) instance->io_port); 745 if (instance->irq == SCSI_IRQ_NONE) 746 SPRINTF("IRQ: None.\n"); 747 else 748 SPRINTF("IRQ: %d.\n", instance->irq); 749 750 #ifdef DTC_PUBLIC_RELEASE 751 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); 752 #endif 753 #ifdef PAS16_PUBLIC_RELEASE 754 SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); 755 #endif 756 spin_lock_irq(instance->host_lock); 757 if (!hostdata->connected) 758 SPRINTF("scsi%d: no currently connected command\n", instance->host_no); 759 else 760 lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m); 761 SPRINTF("scsi%d: issue_queue\n", instance->host_no); 762 for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 763 lprint_Scsi_Cmnd(ptr, m); 764 765 SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); 766 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) 767 lprint_Scsi_Cmnd(ptr, m); 768 spin_unlock_irq(instance->host_lock); 769 return 0; 770 } 771 772 static void lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, struct seq_file *m) 773 { 774 SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); 775 SPRINTF(" command = "); 776 lprint_command(cmd->cmnd, m); 777 } 778 779 static void lprint_command(unsigned char *command, struct seq_file *m) 780 { 781 int i, s; 782 lprint_opcode(command[0], m); 783 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 784 SPRINTF("%02x ", command[i]); 785 SPRINTF("\n"); 786 } 787 788 static void lprint_opcode(int opcode, struct seq_file *m) 789 { 790 SPRINTF("%2d (0x%02x)", opcode, opcode); 791 } 792 793 794 /** 795 * NCR5380_init - initialise an NCR5380 796 * @instance: adapter to configure 797 * @flags: control flags 798 * 799 * Initializes *instance and corresponding 5380 chip, 800 * with flags OR'd into the initial flags value. 801 * 802 * Notes : I assume that the host, hostno, and id bits have been 803 * set correctly. I don't care about the irq and other fields. 804 * 805 * Returns 0 for success 806 * 807 * Locks: interrupts must be enabled when we are called 808 */ 809 810 static int NCR5380_init(struct Scsi_Host *instance, int flags) 811 { 812 NCR5380_local_declare(); 813 int i, pass; 814 unsigned long timeout; 815 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 816 817 if(in_interrupt()) 818 printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); 819 /* 820 * On NCR53C400 boards, NCR5380 registers are mapped 8 past 821 * the base address. 822 */ 823 824 #ifdef NCR53C400 825 if (flags & FLAG_NCR53C400) 826 instance->NCR5380_instance_name += NCR53C400_address_adjust; 827 #endif 828 829 NCR5380_setup(instance); 830 831 hostdata->aborted = 0; 832 hostdata->id_mask = 1 << instance->this_id; 833 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 834 if (i > hostdata->id_mask) 835 hostdata->id_higher_mask |= i; 836 for (i = 0; i < 8; ++i) 837 hostdata->busy[i] = 0; 838 #ifdef REAL_DMA 839 hostdata->dmalen = 0; 840 #endif 841 hostdata->targets_present = 0; 842 hostdata->connected = NULL; 843 hostdata->issue_queue = NULL; 844 hostdata->disconnected_queue = NULL; 845 846 INIT_DELAYED_WORK(&hostdata->coroutine, NCR5380_main); 847 848 #ifdef NCR5380_STATS 849 for (i = 0; i < 8; ++i) { 850 hostdata->time_read[i] = 0; 851 hostdata->time_write[i] = 0; 852 hostdata->bytes_read[i] = 0; 853 hostdata->bytes_write[i] = 0; 854 } 855 hostdata->timebase = 0; 856 hostdata->pendingw = 0; 857 hostdata->pendingr = 0; 858 #endif 859 860 /* The CHECK code seems to break the 53C400. Will check it later maybe */ 861 if (flags & FLAG_NCR53C400) 862 hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; 863 else 864 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; 865 866 hostdata->host = instance; 867 hostdata->time_expires = 0; 868 869 #ifndef AUTOSENSE 870 if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) 871 printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" 872 " be incorrectly cleared.\n", instance->host_no); 873 #endif /* def AUTOSENSE */ 874 875 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 876 NCR5380_write(MODE_REG, MR_BASE); 877 NCR5380_write(TARGET_COMMAND_REG, 0); 878 NCR5380_write(SELECT_ENABLE_REG, 0); 879 880 #ifdef NCR53C400 881 if (hostdata->flags & FLAG_NCR53C400) { 882 NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); 883 } 884 #endif 885 886 /* 887 * Detect and correct bus wedge problems. 888 * 889 * If the system crashed, it may have crashed in a state 890 * where a SCSI command was still executing, and the 891 * SCSI bus is not in a BUS FREE STATE. 892 * 893 * If this is the case, we'll try to abort the currently 894 * established nexus which we know nothing about, and that 895 * failing, do a hard reset of the SCSI bus 896 */ 897 898 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { 899 switch (pass) { 900 case 1: 901 case 3: 902 case 5: 903 printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); 904 timeout = jiffies + 5 * HZ; 905 NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); 906 break; 907 case 2: 908 printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); 909 do_abort(instance); 910 break; 911 case 4: 912 printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); 913 do_reset(instance); 914 break; 915 case 6: 916 printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); 917 return -ENXIO; 918 } 919 } 920 return 0; 921 } 922 923 /** 924 * NCR5380_exit - remove an NCR5380 925 * @instance: adapter to remove 926 */ 927 928 static void NCR5380_exit(struct Scsi_Host *instance) 929 { 930 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 931 932 cancel_delayed_work_sync(&hostdata->coroutine); 933 } 934 935 /** 936 * NCR5380_queue_command - queue a command 937 * @cmd: SCSI command 938 * @done: completion handler 939 * 940 * cmd is added to the per instance issue_queue, with minor 941 * twiddling done to the host specific fields of cmd. If the 942 * main coroutine is not running, it is restarted. 943 * 944 * Locks: host lock taken by caller 945 */ 946 947 static int NCR5380_queue_command_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) 948 { 949 struct Scsi_Host *instance = cmd->device->host; 950 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 951 Scsi_Cmnd *tmp; 952 953 #if (NDEBUG & NDEBUG_NO_WRITE) 954 switch (cmd->cmnd[0]) { 955 case WRITE_6: 956 case WRITE_10: 957 printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); 958 cmd->result = (DID_ERROR << 16); 959 done(cmd); 960 return 0; 961 } 962 #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 963 964 #ifdef NCR5380_STATS 965 switch (cmd->cmnd[0]) { 966 case WRITE: 967 case WRITE_6: 968 case WRITE_10: 969 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 970 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd); 971 hostdata->pendingw++; 972 break; 973 case READ: 974 case READ_6: 975 case READ_10: 976 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 977 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd); 978 hostdata->pendingr++; 979 break; 980 } 981 #endif 982 983 /* 984 * We use the host_scribble field as a pointer to the next command 985 * in a queue 986 */ 987 988 cmd->host_scribble = NULL; 989 cmd->scsi_done = done; 990 cmd->result = 0; 991 992 /* 993 * Insert the cmd into the issue queue. Note that REQUEST SENSE 994 * commands are added to the head of the queue since any command will 995 * clear the contingent allegiance condition that exists and the 996 * sense data is only guaranteed to be valid while the condition exists. 997 */ 998 999 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1000 LIST(cmd, hostdata->issue_queue); 1001 cmd->host_scribble = (unsigned char *) hostdata->issue_queue; 1002 hostdata->issue_queue = cmd; 1003 } else { 1004 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); 1005 LIST(cmd, tmp); 1006 tmp->host_scribble = (unsigned char *) cmd; 1007 } 1008 dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); 1009 1010 /* Run the coroutine if it isn't already running. */ 1011 /* Kick off command processing */ 1012 schedule_delayed_work(&hostdata->coroutine, 0); 1013 return 0; 1014 } 1015 1016 static DEF_SCSI_QCMD(NCR5380_queue_command) 1017 1018 /** 1019 * NCR5380_main - NCR state machines 1020 * 1021 * NCR5380_main is a coroutine that runs as long as more work can 1022 * be done on the NCR5380 host adapters in a system. Both 1023 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1024 * in case it is not running. 1025 * 1026 * Locks: called as its own thread with no locks held. Takes the 1027 * host lock and called routines may take the isa dma lock. 1028 */ 1029 1030 static void NCR5380_main(struct work_struct *work) 1031 { 1032 struct NCR5380_hostdata *hostdata = 1033 container_of(work, struct NCR5380_hostdata, coroutine.work); 1034 struct Scsi_Host *instance = hostdata->host; 1035 Scsi_Cmnd *tmp, *prev; 1036 int done; 1037 1038 spin_lock_irq(instance->host_lock); 1039 do { 1040 /* Lock held here */ 1041 done = 1; 1042 if (!hostdata->connected && !hostdata->selecting) { 1043 dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); 1044 /* 1045 * Search through the issue_queue for a command destined 1046 * for a target that's not busy. 1047 */ 1048 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 1049 { 1050 if (prev != tmp) 1051 dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); 1052 /* When we find one, remove it from the issue queue. */ 1053 if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { 1054 if (prev) { 1055 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 1056 prev->host_scribble = tmp->host_scribble; 1057 } else { 1058 REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); 1059 hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; 1060 } 1061 tmp->host_scribble = NULL; 1062 1063 /* 1064 * Attempt to establish an I_T_L nexus here. 1065 * On success, instance->hostdata->connected is set. 1066 * On failure, we must add the command back to the 1067 * issue queue so we can keep trying. 1068 */ 1069 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); 1070 1071 /* 1072 * A successful selection is defined as one that 1073 * leaves us with the command connected and 1074 * in hostdata->connected, OR has terminated the 1075 * command. 1076 * 1077 * With successful commands, we fall through 1078 * and see if we can do an information transfer, 1079 * with failures we will restart. 1080 */ 1081 hostdata->selecting = NULL; 1082 /* RvC: have to preset this to indicate a new command is being performed */ 1083 1084 if (!NCR5380_select(instance, tmp, 1085 /* 1086 * REQUEST SENSE commands are issued without tagged 1087 * queueing, even on SCSI-II devices because the 1088 * contingent allegiance condition exists for the 1089 * entire unit. 1090 */ 1091 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1092 break; 1093 } else { 1094 LIST(tmp, hostdata->issue_queue); 1095 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1096 hostdata->issue_queue = tmp; 1097 done = 0; 1098 dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); 1099 } 1100 /* lock held here still */ 1101 } /* if target/lun is not busy */ 1102 } /* for */ 1103 /* exited locked */ 1104 } /* if (!hostdata->connected) */ 1105 if (hostdata->selecting) { 1106 tmp = (Scsi_Cmnd *) hostdata->selecting; 1107 /* Selection will drop and retake the lock */ 1108 if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { 1109 /* Ok ?? */ 1110 } else { 1111 /* RvC: device failed, so we wait a long time 1112 this is needed for Mustek scanners, that 1113 do not respond to commands immediately 1114 after a scan */ 1115 printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); 1116 LIST(tmp, hostdata->issue_queue); 1117 tmp->host_scribble = (unsigned char *) hostdata->issue_queue; 1118 hostdata->issue_queue = tmp; 1119 NCR5380_set_timer(hostdata, USLEEP_WAITLONG); 1120 } 1121 } /* if hostdata->selecting */ 1122 if (hostdata->connected 1123 #ifdef REAL_DMA 1124 && !hostdata->dmalen 1125 #endif 1126 && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) 1127 ) { 1128 dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); 1129 NCR5380_information_transfer(instance); 1130 dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); 1131 done = 0; 1132 } else 1133 break; 1134 } while (!done); 1135 1136 spin_unlock_irq(instance->host_lock); 1137 } 1138 1139 #ifndef DONT_USE_INTR 1140 1141 /** 1142 * NCR5380_intr - generic NCR5380 irq handler 1143 * @irq: interrupt number 1144 * @dev_id: device info 1145 * 1146 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1147 * from the disconnected queue, and restarting NCR5380_main() 1148 * as required. 1149 * 1150 * Locks: takes the needed instance locks 1151 */ 1152 1153 static irqreturn_t NCR5380_intr(int dummy, void *dev_id) 1154 { 1155 NCR5380_local_declare(); 1156 struct Scsi_Host *instance = dev_id; 1157 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1158 int done; 1159 unsigned char basr; 1160 unsigned long flags; 1161 1162 dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", 1163 instance->irq)); 1164 1165 do { 1166 done = 1; 1167 spin_lock_irqsave(instance->host_lock, flags); 1168 /* Look for pending interrupts */ 1169 NCR5380_setup(instance); 1170 basr = NCR5380_read(BUS_AND_STATUS_REG); 1171 /* XXX dispatch to appropriate routine if found and done=0 */ 1172 if (basr & BASR_IRQ) { 1173 NCR5380_dprint(NDEBUG_INTR, instance); 1174 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1175 done = 0; 1176 dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); 1177 NCR5380_reselect(instance); 1178 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1179 } else if (basr & BASR_PARITY_ERROR) { 1180 dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); 1181 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1182 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1183 dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); 1184 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1185 } else { 1186 #if defined(REAL_DMA) 1187 /* 1188 * We should only get PHASE MISMATCH and EOP interrupts 1189 * if we have DMA enabled, so do a sanity check based on 1190 * the current setting of the MODE register. 1191 */ 1192 1193 if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { 1194 int transferred; 1195 1196 if (!hostdata->connected) 1197 panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); 1198 1199 transferred = (hostdata->dmalen - NCR5380_dma_residual(instance)); 1200 hostdata->connected->SCp.this_residual -= transferred; 1201 hostdata->connected->SCp.ptr += transferred; 1202 hostdata->dmalen = 0; 1203 1204 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1205 1206 /* FIXME: we need to poll briefly then defer a workqueue task ! */ 1207 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); 1208 1209 NCR5380_write(MODE_REG, MR_BASE); 1210 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1211 } 1212 #else 1213 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))); 1214 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1215 #endif 1216 } 1217 } /* if BASR_IRQ */ 1218 spin_unlock_irqrestore(instance->host_lock, flags); 1219 if(!done) 1220 schedule_delayed_work(&hostdata->coroutine, 0); 1221 } while (!done); 1222 return IRQ_HANDLED; 1223 } 1224 1225 #endif 1226 1227 /** 1228 * collect_stats - collect stats on a scsi command 1229 * @hostdata: adapter 1230 * @cmd: command being issued 1231 * 1232 * Update the statistical data by parsing the command in question 1233 */ 1234 1235 static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) 1236 { 1237 #ifdef NCR5380_STATS 1238 switch (cmd->cmnd[0]) { 1239 case WRITE: 1240 case WRITE_6: 1241 case WRITE_10: 1242 hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1243 hostdata->pendingw--; 1244 break; 1245 case READ: 1246 case READ_6: 1247 case READ_10: 1248 hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); 1249 hostdata->pendingr--; 1250 break; 1251 } 1252 #endif 1253 } 1254 1255 1256 /* 1257 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1258 * int tag); 1259 * 1260 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1261 * including ARBITRATION, SELECTION, and initial message out for 1262 * IDENTIFY and queue messages. 1263 * 1264 * Inputs : instance - instantiation of the 5380 driver on which this 1265 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1266 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1267 * the command that is presently connected. 1268 * 1269 * Returns : -1 if selection could not execute for some reason, 1270 * 0 if selection succeeded or failed because the target 1271 * did not respond. 1272 * 1273 * Side effects : 1274 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1275 * with registers as they should have been on entry - ie 1276 * SELECT_ENABLE will be set appropriately, the NCR5380 1277 * will cease to drive any SCSI bus signals. 1278 * 1279 * If successful : I_T_L or I_T_L_Q nexus will be established, 1280 * instance->connected will be set to cmd. 1281 * SELECT interrupt will be disabled. 1282 * 1283 * If failed (no target) : cmd->scsi_done() will be called, and the 1284 * cmd->result host byte set to DID_BAD_TARGET. 1285 * 1286 * Locks: caller holds hostdata lock in IRQ mode 1287 */ 1288 1289 static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) 1290 { 1291 NCR5380_local_declare(); 1292 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1293 unsigned char tmp[3], phase; 1294 unsigned char *data; 1295 int len; 1296 unsigned long timeout; 1297 unsigned char value; 1298 int err; 1299 NCR5380_setup(instance); 1300 1301 if (hostdata->selecting) 1302 goto part2; 1303 1304 hostdata->restart_select = 0; 1305 1306 NCR5380_dprint(NDEBUG_ARBITRATION, instance); 1307 dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); 1308 1309 /* 1310 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1311 * data bus during SELECTION. 1312 */ 1313 1314 NCR5380_write(TARGET_COMMAND_REG, 0); 1315 1316 /* 1317 * Start arbitration. 1318 */ 1319 1320 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1321 NCR5380_write(MODE_REG, MR_ARBITRATE); 1322 1323 1324 /* We can be relaxed here, interrupts are on, we are 1325 in workqueue context, the birds are singing in the trees */ 1326 spin_unlock_irq(instance->host_lock); 1327 err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); 1328 spin_lock_irq(instance->host_lock); 1329 if (err < 0) { 1330 printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); 1331 NCR5380_write(MODE_REG, MR_BASE); 1332 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1333 goto failed; 1334 } 1335 1336 dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); 1337 1338 /* 1339 * The arbitration delay is 2.2us, but this is a minimum and there is 1340 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1341 * the integral nature of udelay(). 1342 * 1343 */ 1344 1345 udelay(3); 1346 1347 /* Check for lost arbitration */ 1348 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)) { 1349 NCR5380_write(MODE_REG, MR_BASE); 1350 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); 1351 goto failed; 1352 } 1353 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); 1354 1355 if (!(hostdata->flags & FLAG_DTC3181E) && 1356 /* RvC: DTC3181E has some trouble with this 1357 * so we simply removed it. Seems to work with 1358 * only Mustek scanner attached 1359 */ 1360 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { 1361 NCR5380_write(MODE_REG, MR_BASE); 1362 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1363 dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); 1364 goto failed; 1365 } 1366 /* 1367 * Again, bus clear + bus settle time is 1.2us, however, this is 1368 * a minimum so we'll udelay ceil(1.2) 1369 */ 1370 1371 udelay(2); 1372 1373 dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); 1374 1375 /* 1376 * Now that we have won arbitration, start Selection process, asserting 1377 * the host and target ID's on the SCSI bus. 1378 */ 1379 1380 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); 1381 1382 /* 1383 * Raise ATN while SEL is true before BSY goes false from arbitration, 1384 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1385 * phase immediately after selection. 1386 */ 1387 1388 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1389 NCR5380_write(MODE_REG, MR_BASE); 1390 1391 /* 1392 * Reselect interrupts must be turned off prior to the dropping of BSY, 1393 * otherwise we will trigger an interrupt. 1394 */ 1395 NCR5380_write(SELECT_ENABLE_REG, 0); 1396 1397 /* 1398 * The initiator shall then wait at least two deskew delays and release 1399 * the BSY signal. 1400 */ 1401 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1402 1403 /* Reset BSY */ 1404 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1405 1406 /* 1407 * Something weird happens when we cease to drive BSY - looks 1408 * like the board/chip is letting us do another read before the 1409 * appropriate propagation delay has expired, and we're confusing 1410 * a BSY signal from ourselves as the target's response to SELECTION. 1411 * 1412 * A small delay (the 'C++' frontend breaks the pipeline with an 1413 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1414 * tighter 'C' code breaks and requires this) solves the problem - 1415 * the 1 us delay is arbitrary, and only used because this delay will 1416 * be the same on other platforms and since it works here, it should 1417 * work there. 1418 * 1419 * wingel suggests that this could be due to failing to wait 1420 * one deskew delay. 1421 */ 1422 1423 udelay(1); 1424 1425 dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); 1426 1427 /* 1428 * The SCSI specification calls for a 250 ms timeout for the actual 1429 * selection. 1430 */ 1431 1432 timeout = jiffies + (250 * HZ / 1000); 1433 1434 /* 1435 * XXX very interesting - we're seeing a bounce where the BSY we 1436 * asserted is being reflected / still asserted (propagation delay?) 1437 * and it's detecting as true. Sigh. 1438 */ 1439 1440 hostdata->select_time = 0; /* we count the clock ticks at which we polled */ 1441 hostdata->selecting = cmd; 1442 1443 part2: 1444 /* RvC: here we enter after a sleeping period, or immediately after 1445 execution of part 1 1446 we poll only once ech clock tick */ 1447 value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); 1448 1449 if (!value && (hostdata->select_time < HZ/4)) { 1450 /* RvC: we still must wait for a device response */ 1451 hostdata->select_time++; /* after 25 ticks the device has failed */ 1452 NCR5380_set_timer(hostdata, 1); 1453 return 0; /* RvC: we return here with hostdata->selecting set, 1454 to go to sleep */ 1455 } 1456 1457 hostdata->selecting = NULL;/* clear this pointer, because we passed the 1458 waiting period */ 1459 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1460 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1461 NCR5380_reselect(instance); 1462 printk("scsi%d : reselection after won arbitration?\n", instance->host_no); 1463 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1464 return -1; 1465 } 1466 /* 1467 * No less than two deskew delays after the initiator detects the 1468 * BSY signal is true, it shall release the SEL signal and may 1469 * change the DATA BUS. -wingel 1470 */ 1471 1472 udelay(1); 1473 1474 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1475 1476 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1477 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1478 if (hostdata->targets_present & (1 << scmd_id(cmd))) { 1479 printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); 1480 if (hostdata->restart_select) 1481 printk(KERN_DEBUG "\trestart select\n"); 1482 NCR5380_dprint(NDEBUG_SELECTION, instance); 1483 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1484 return -1; 1485 } 1486 cmd->result = DID_BAD_TARGET << 16; 1487 collect_stats(hostdata, cmd); 1488 cmd->scsi_done(cmd); 1489 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1490 dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); 1491 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1492 return 0; 1493 } 1494 hostdata->targets_present |= (1 << scmd_id(cmd)); 1495 1496 /* 1497 * Since we followed the SCSI spec, and raised ATN while SEL 1498 * was true but before BSY was false during selection, the information 1499 * transfer phase should be a MESSAGE OUT phase so that we can send the 1500 * IDENTIFY message. 1501 * 1502 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1503 * message (2 bytes) with a tag ID that we increment with every command 1504 * until it wraps back to 0. 1505 * 1506 * XXX - it turns out that there are some broken SCSI-II devices, 1507 * which claim to support tagged queuing but fail when more than 1508 * some number of commands are issued at once. 1509 */ 1510 1511 /* Wait for start of REQ/ACK handshake */ 1512 1513 spin_unlock_irq(instance->host_lock); 1514 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); 1515 spin_lock_irq(instance->host_lock); 1516 1517 if(err) { 1518 printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); 1519 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1520 goto failed; 1521 } 1522 1523 dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); 1524 tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); 1525 1526 len = 1; 1527 cmd->tag = 0; 1528 1529 /* Send message(s) */ 1530 data = tmp; 1531 phase = PHASE_MSGOUT; 1532 NCR5380_transfer_pio(instance, &phase, &len, &data); 1533 dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); 1534 /* XXX need to handle errors here */ 1535 hostdata->connected = cmd; 1536 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1537 1538 initialize_SCp(cmd); 1539 1540 return 0; 1541 1542 /* Selection failed */ 1543 failed: 1544 return -1; 1545 1546 } 1547 1548 /* 1549 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1550 * unsigned char *phase, int *count, unsigned char **data) 1551 * 1552 * Purpose : transfers data in given phase using polled I/O 1553 * 1554 * Inputs : instance - instance of driver, *phase - pointer to 1555 * what phase is expected, *count - pointer to number of 1556 * bytes to transfer, **data - pointer to data pointer. 1557 * 1558 * Returns : -1 when different phase is entered without transferring 1559 * maximum number of bytes, 0 if all bytes or transferred or exit 1560 * is in same phase. 1561 * 1562 * Also, *phase, *count, *data are modified in place. 1563 * 1564 * XXX Note : handling for bus free may be useful. 1565 */ 1566 1567 /* 1568 * Note : this code is not as quick as it could be, however it 1569 * IS 100% reliable, and for the actual data transfer where speed 1570 * counts, we will always do a pseudo DMA or DMA transfer. 1571 */ 1572 1573 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1574 NCR5380_local_declare(); 1575 unsigned char p = *phase, tmp; 1576 int c = *count; 1577 unsigned char *d = *data; 1578 /* 1579 * RvC: some administrative data to process polling time 1580 */ 1581 int break_allowed = 0; 1582 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1583 NCR5380_setup(instance); 1584 1585 if (!(p & SR_IO)) 1586 dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); 1587 else 1588 dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); 1589 1590 /* 1591 * The NCR5380 chip will only drive the SCSI bus when the 1592 * phase specified in the appropriate bits of the TARGET COMMAND 1593 * REGISTER match the STATUS REGISTER 1594 */ 1595 1596 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1597 1598 /* RvC: don't know if this is necessary, but other SCSI I/O is short 1599 * so breaks are not necessary there 1600 */ 1601 if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { 1602 break_allowed = 1; 1603 } 1604 do { 1605 /* 1606 * Wait for assertion of REQ, after which the phase bits will be 1607 * valid 1608 */ 1609 1610 /* RvC: we simply poll once, after that we stop temporarily 1611 * and let the device buffer fill up 1612 * if breaking is not allowed, we keep polling as long as needed 1613 */ 1614 1615 /* FIXME */ 1616 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); 1617 if (!(tmp & SR_REQ)) { 1618 /* timeout condition */ 1619 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 1620 break; 1621 } 1622 1623 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); 1624 1625 /* Check for phase mismatch */ 1626 if ((tmp & PHASE_MASK) != p) { 1627 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); 1628 NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); 1629 break; 1630 } 1631 /* Do actual transfer from SCSI bus to / from memory */ 1632 if (!(p & SR_IO)) 1633 NCR5380_write(OUTPUT_DATA_REG, *d); 1634 else 1635 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1636 1637 ++d; 1638 1639 /* 1640 * The SCSI standard suggests that in MSGOUT phase, the initiator 1641 * should drop ATN on the last byte of the message phase 1642 * after REQ has been asserted for the handshake but before 1643 * the initiator raises ACK. 1644 */ 1645 1646 if (!(p & SR_IO)) { 1647 if (!((p & SR_MSG) && c > 1)) { 1648 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1649 NCR5380_dprint(NDEBUG_PIO, instance); 1650 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1651 } else { 1652 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1653 NCR5380_dprint(NDEBUG_PIO, instance); 1654 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1655 } 1656 } else { 1657 NCR5380_dprint(NDEBUG_PIO, instance); 1658 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1659 } 1660 1661 /* FIXME - if this fails bus reset ?? */ 1662 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); 1663 dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); 1664 1665 /* 1666 * We have several special cases to consider during REQ/ACK handshaking : 1667 * 1. We were in MSGOUT phase, and we are on the last byte of the 1668 * message. ATN must be dropped as ACK is dropped. 1669 * 1670 * 2. We are in a MSGIN phase, and we are on the last byte of the 1671 * message. We must exit with ACK asserted, so that the calling 1672 * code may raise ATN before dropping ACK to reject the message. 1673 * 1674 * 3. ACK and ATN are clear and the target may proceed as normal. 1675 */ 1676 if (!(p == PHASE_MSGIN && c == 1)) { 1677 if (p == PHASE_MSGOUT && c > 1) 1678 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1679 else 1680 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1681 } 1682 } while (--c); 1683 1684 dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); 1685 1686 *count = c; 1687 *data = d; 1688 tmp = NCR5380_read(STATUS_REG); 1689 if (tmp & SR_REQ) 1690 *phase = tmp & PHASE_MASK; 1691 else 1692 *phase = PHASE_UNKNOWN; 1693 1694 if (!c || (*phase == p)) 1695 return 0; 1696 else 1697 return -1; 1698 } 1699 1700 /** 1701 * do_reset - issue a reset command 1702 * @host: adapter to reset 1703 * 1704 * Issue a reset sequence to the NCR5380 and try and get the bus 1705 * back into sane shape. 1706 * 1707 * Locks: caller holds queue lock 1708 */ 1709 1710 static void do_reset(struct Scsi_Host *host) { 1711 NCR5380_local_declare(); 1712 NCR5380_setup(host); 1713 1714 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); 1715 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 1716 udelay(25); 1717 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1718 } 1719 1720 /* 1721 * Function : do_abort (Scsi_Host *host) 1722 * 1723 * Purpose : abort the currently established nexus. Should only be 1724 * called from a routine which can drop into a 1725 * 1726 * Returns : 0 on success, -1 on failure. 1727 * 1728 * Locks: queue lock held by caller 1729 * FIXME: sort this out and get new_eh running 1730 */ 1731 1732 static int do_abort(struct Scsi_Host *host) { 1733 NCR5380_local_declare(); 1734 unsigned char *msgptr, phase, tmp; 1735 int len; 1736 int rc; 1737 NCR5380_setup(host); 1738 1739 1740 /* Request message out phase */ 1741 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1742 1743 /* 1744 * Wait for the target to indicate a valid phase by asserting 1745 * REQ. Once this happens, we'll have either a MSGOUT phase 1746 * and can immediately send the ABORT message, or we'll have some 1747 * other phase and will have to source/sink data. 1748 * 1749 * We really don't care what value was on the bus or what value 1750 * the target sees, so we just handshake. 1751 */ 1752 1753 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); 1754 1755 if(rc < 0) 1756 return -1; 1757 1758 tmp = (unsigned char)rc; 1759 1760 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1761 1762 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1763 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1764 rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); 1765 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1766 if(rc == -1) 1767 return -1; 1768 } 1769 tmp = ABORT; 1770 msgptr = &tmp; 1771 len = 1; 1772 phase = PHASE_MSGOUT; 1773 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1774 1775 /* 1776 * If we got here, and the command completed successfully, 1777 * we're about to go into bus free state. 1778 */ 1779 1780 return len ? -1 : 0; 1781 } 1782 1783 #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) 1784 /* 1785 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1786 * unsigned char *phase, int *count, unsigned char **data) 1787 * 1788 * Purpose : transfers data in given phase using either real 1789 * or pseudo DMA. 1790 * 1791 * Inputs : instance - instance of driver, *phase - pointer to 1792 * what phase is expected, *count - pointer to number of 1793 * bytes to transfer, **data - pointer to data pointer. 1794 * 1795 * Returns : -1 when different phase is entered without transferring 1796 * maximum number of bytes, 0 if all bytes or transferred or exit 1797 * is in same phase. 1798 * 1799 * Also, *phase, *count, *data are modified in place. 1800 * 1801 * Locks: io_request lock held by caller 1802 */ 1803 1804 1805 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { 1806 NCR5380_local_declare(); 1807 register int c = *count; 1808 register unsigned char p = *phase; 1809 register unsigned char *d = *data; 1810 unsigned char tmp; 1811 int foo; 1812 #if defined(REAL_DMA_POLL) 1813 int cnt, toPIO; 1814 unsigned char saved_data = 0, overrun = 0, residue; 1815 #endif 1816 1817 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 1818 1819 NCR5380_setup(instance); 1820 1821 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1822 *phase = tmp; 1823 return -1; 1824 } 1825 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 1826 #ifdef READ_OVERRUNS 1827 if (p & SR_IO) { 1828 c -= 2; 1829 } 1830 #endif 1831 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)); 1832 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); 1833 #endif 1834 1835 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1836 1837 #ifdef REAL_DMA 1838 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1839 #elif defined(REAL_DMA_POLL) 1840 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1841 #else 1842 /* 1843 * Note : on my sample board, watch-dog timeouts occurred when interrupts 1844 * were not disabled for the duration of a single DMA transfer, from 1845 * before the setting of DMA mode to after transfer of the last byte. 1846 */ 1847 1848 #if defined(PSEUDO_DMA) && defined(UNSAFE) 1849 spin_unlock_irq(instance->host_lock); 1850 #endif 1851 /* KLL May need eop and parity in 53c400 */ 1852 if (hostdata->flags & FLAG_NCR53C400) 1853 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | 1854 MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | 1855 MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1856 else 1857 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); 1858 #endif /* def REAL_DMA */ 1859 1860 dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); 1861 1862 /* 1863 * On the PAS16 at least I/O recovery delays are not needed here. 1864 * Everyone else seems to want them. 1865 */ 1866 1867 if (p & SR_IO) { 1868 io_recovery_delay(1); 1869 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1870 } else { 1871 io_recovery_delay(1); 1872 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1873 io_recovery_delay(1); 1874 NCR5380_write(START_DMA_SEND_REG, 0); 1875 io_recovery_delay(1); 1876 } 1877 1878 #if defined(REAL_DMA_POLL) 1879 do { 1880 tmp = NCR5380_read(BUS_AND_STATUS_REG); 1881 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); 1882 1883 /* 1884 At this point, either we've completed DMA, or we have a phase mismatch, 1885 or we've unexpectedly lost BUSY (which is a real error). 1886 1887 For write DMAs, we want to wait until the last byte has been 1888 transferred out over the bus before we turn off DMA mode. Alas, there 1889 seems to be no terribly good way of doing this on a 5380 under all 1890 conditions. For non-scatter-gather operations, we can wait until REQ 1891 and ACK both go false, or until a phase mismatch occurs. Gather-writes 1892 are nastier, since the device will be expecting more data than we 1893 are prepared to send it, and REQ will remain asserted. On a 53C8[01] we 1894 could test LAST BIT SENT to assure transfer (I imagine this is precisely 1895 why this signal was added to the newer chips) but on the older 538[01] 1896 this signal does not exist. The workaround for this lack is a watchdog; 1897 we bail out of the wait-loop after a modest amount of wait-time if 1898 the usual exit conditions are not met. Not a terribly clean or 1899 correct solution :-% 1900 1901 Reads are equally tricky due to a nasty characteristic of the NCR5380. 1902 If the chip is in DMA mode for an READ, it will respond to a target's 1903 REQ by latching the SCSI data into the INPUT DATA register and asserting 1904 ACK, even if it has _already_ been notified by the DMA controller that 1905 the current DMA transfer has completed! If the NCR5380 is then taken 1906 out of DMA mode, this already-acknowledged byte is lost. 1907 1908 This is not a problem for "one DMA transfer per command" reads, because 1909 the situation will never arise... either all of the data is DMA'ed 1910 properly, or the target switches to MESSAGE IN phase to signal a 1911 disconnection (either operation bringing the DMA to a clean halt). 1912 However, in order to handle scatter-reads, we must work around the 1913 problem. The chosen fix is to DMA N-2 bytes, then check for the 1914 condition before taking the NCR5380 out of DMA mode. One or two extra 1915 bytes are transferred via PIO as necessary to fill out the original 1916 request. 1917 */ 1918 1919 if (p & SR_IO) { 1920 #ifdef READ_OVERRUNS 1921 udelay(10); 1922 if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { 1923 saved_data = NCR5380_read(INPUT_DATA_REGISTER); 1924 overrun = 1; 1925 } 1926 #endif 1927 } else { 1928 int limit = 100; 1929 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { 1930 if (!(tmp & BASR_PHASE_MATCH)) 1931 break; 1932 if (--limit < 0) 1933 break; 1934 } 1935 } 1936 1937 dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); 1938 1939 NCR5380_write(MODE_REG, MR_BASE); 1940 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1941 1942 residue = NCR5380_dma_residual(instance); 1943 c -= residue; 1944 *count -= c; 1945 *data += c; 1946 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 1947 1948 #ifdef READ_OVERRUNS 1949 if (*phase == p && (p & SR_IO) && residue == 0) { 1950 if (overrun) { 1951 dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); 1952 **data = saved_data; 1953 *data += 1; 1954 *count -= 1; 1955 cnt = toPIO = 1; 1956 } else { 1957 printk("No overrun??\n"); 1958 cnt = toPIO = 2; 1959 } 1960 dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); 1961 NCR5380_transfer_pio(instance, phase, &cnt, data); 1962 *count -= toPIO - cnt; 1963 } 1964 #endif 1965 1966 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))); 1967 return 0; 1968 1969 #elif defined(REAL_DMA) 1970 return 0; 1971 #else /* defined(REAL_DMA_POLL) */ 1972 if (p & SR_IO) { 1973 #ifdef DMA_WORKS_RIGHT 1974 foo = NCR5380_pread(instance, d, c); 1975 #else 1976 int diff = 1; 1977 if (hostdata->flags & FLAG_NCR53C400) { 1978 diff = 0; 1979 } 1980 if (!(foo = NCR5380_pread(instance, d, c - diff))) { 1981 /* 1982 * We can't disable DMA mode after successfully transferring 1983 * what we plan to be the last byte, since that would open up 1984 * a race condition where if the target asserted REQ before 1985 * we got the DMA mode reset, the NCR5380 would have latched 1986 * an additional byte into the INPUT DATA register and we'd 1987 * have dropped it. 1988 * 1989 * The workaround was to transfer one fewer bytes than we 1990 * intended to with the pseudo-DMA read function, wait for 1991 * the chip to latch the last byte, read it, and then disable 1992 * pseudo-DMA mode. 1993 * 1994 * After REQ is asserted, the NCR5380 asserts DRQ and ACK. 1995 * REQ is deasserted when ACK is asserted, and not reasserted 1996 * until ACK goes false. Since the NCR5380 won't lower ACK 1997 * until DACK is asserted, which won't happen unless we twiddle 1998 * the DMA port or we take the NCR5380 out of DMA mode, we 1999 * can guarantee that we won't handshake another extra 2000 * byte. 2001 */ 2002 2003 if (!(hostdata->flags & FLAG_NCR53C400)) { 2004 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); 2005 /* Wait for clean handshake */ 2006 while (NCR5380_read(STATUS_REG) & SR_REQ); 2007 d[c - 1] = NCR5380_read(INPUT_DATA_REG); 2008 } 2009 } 2010 #endif 2011 } else { 2012 #ifdef DMA_WORKS_RIGHT 2013 foo = NCR5380_pwrite(instance, d, c); 2014 #else 2015 int timeout; 2016 dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); 2017 if (!(foo = NCR5380_pwrite(instance, d, c))) { 2018 /* 2019 * Wait for the last byte to be sent. If REQ is being asserted for 2020 * the byte we're interested, we'll ACK it and it will go false. 2021 */ 2022 if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { 2023 timeout = 20000; 2024 while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); 2025 2026 if (!timeout) 2027 dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); 2028 2029 if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { 2030 hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; 2031 if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { 2032 hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; 2033 dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); 2034 } 2035 } 2036 } else { 2037 dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); 2038 while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); 2039 dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); 2040 } 2041 } 2042 #endif 2043 } 2044 NCR5380_write(MODE_REG, MR_BASE); 2045 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2046 2047 if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { 2048 dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); 2049 if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { 2050 dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); 2051 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2052 } else { 2053 printk("53C400w: IRQ NOT THERE!\n"); 2054 } 2055 } 2056 *data = d + c; 2057 *count = 0; 2058 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; 2059 #if defined(PSEUDO_DMA) && defined(UNSAFE) 2060 spin_lock_irq(instance->host_lock); 2061 #endif /* defined(REAL_DMA_POLL) */ 2062 return foo; 2063 #endif /* def REAL_DMA */ 2064 } 2065 #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ 2066 2067 /* 2068 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2069 * 2070 * Purpose : run through the various SCSI phases and do as the target 2071 * directs us to. Operates on the currently connected command, 2072 * instance->connected. 2073 * 2074 * Inputs : instance, instance for which we are doing commands 2075 * 2076 * Side effects : SCSI things happen, the disconnected queue will be 2077 * modified if a command disconnects, *instance->connected will 2078 * change. 2079 * 2080 * XXX Note : we need to watch for bus free or a reset condition here 2081 * to recover from an unexpected bus free condition. 2082 * 2083 * Locks: io_request_lock held by caller in IRQ mode 2084 */ 2085 2086 static void NCR5380_information_transfer(struct Scsi_Host *instance) { 2087 NCR5380_local_declare(); 2088 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; 2089 unsigned char msgout = NOP; 2090 int sink = 0; 2091 int len; 2092 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2093 int transfersize; 2094 #endif 2095 unsigned char *data; 2096 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2097 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2098 /* RvC: we need to set the end of the polling time */ 2099 unsigned long poll_time = jiffies + USLEEP_POLL; 2100 2101 NCR5380_setup(instance); 2102 2103 while (1) { 2104 tmp = NCR5380_read(STATUS_REG); 2105 /* We only have a valid SCSI phase when REQ is asserted */ 2106 if (tmp & SR_REQ) { 2107 phase = (tmp & PHASE_MASK); 2108 if (phase != old_phase) { 2109 old_phase = phase; 2110 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); 2111 } 2112 if (sink && (phase != PHASE_MSGOUT)) { 2113 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2114 2115 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 2116 while (NCR5380_read(STATUS_REG) & SR_REQ); 2117 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2118 sink = 0; 2119 continue; 2120 } 2121 switch (phase) { 2122 case PHASE_DATAIN: 2123 case PHASE_DATAOUT: 2124 #if (NDEBUG & NDEBUG_NO_DATAOUT) 2125 printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); 2126 sink = 1; 2127 do_abort(instance); 2128 cmd->result = DID_ERROR << 16; 2129 cmd->scsi_done(cmd); 2130 return; 2131 #endif 2132 /* 2133 * If there is no room left in the current buffer in the 2134 * scatter-gather list, move onto the next one. 2135 */ 2136 2137 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2138 ++cmd->SCp.buffer; 2139 --cmd->SCp.buffers_residual; 2140 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2141 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer); 2142 dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); 2143 } 2144 /* 2145 * The preferred transfer method is going to be 2146 * PSEUDO-DMA for systems that are strictly PIO, 2147 * since we can let the hardware do the handshaking. 2148 * 2149 * For this to work, we need to know the transfersize 2150 * ahead of time, since the pseudo-DMA code will sit 2151 * in an unconditional loop. 2152 */ 2153 2154 #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) 2155 /* KLL 2156 * PSEUDO_DMA is defined here. If this is the g_NCR5380 2157 * driver then it will always be defined, so the 2158 * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base 2159 * NCR5380 case. I think this is a fairly clean solution. 2160 * We supplement these 2 if's with the flag. 2161 */ 2162 #ifdef NCR5380_dma_xfer_len 2163 if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { 2164 #else 2165 transfersize = cmd->transfersize; 2166 2167 #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ 2168 if (transfersize > 512) 2169 transfersize = 512; 2170 #endif /* LIMIT_TRANSFERSIZE */ 2171 2172 if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { 2173 /* Limit transfers to 32K, for xx400 & xx406 2174 * pseudoDMA that transfers in 128 bytes blocks. */ 2175 if (transfersize > 32 * 1024) 2176 transfersize = 32 * 1024; 2177 #endif 2178 len = transfersize; 2179 if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { 2180 /* 2181 * If the watchdog timer fires, all future accesses to this 2182 * device will use the polled-IO. 2183 */ 2184 scmd_printk(KERN_INFO, cmd, 2185 "switching to slow handshake\n"); 2186 cmd->device->borken = 1; 2187 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2188 sink = 1; 2189 do_abort(instance); 2190 cmd->result = DID_ERROR << 16; 2191 cmd->scsi_done(cmd); 2192 /* XXX - need to source or sink data here, as appropriate */ 2193 } else 2194 cmd->SCp.this_residual -= transfersize - len; 2195 } else 2196 #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ 2197 NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) 2198 &cmd->SCp.ptr); 2199 break; 2200 case PHASE_MSGIN: 2201 len = 1; 2202 data = &tmp; 2203 NCR5380_transfer_pio(instance, &phase, &len, &data); 2204 cmd->SCp.Message = tmp; 2205 2206 switch (tmp) { 2207 /* 2208 * Linking lets us reduce the time required to get the 2209 * next command out to the device, hopefully this will 2210 * mean we don't waste another revolution due to the delays 2211 * required by ARBITRATION and another SELECTION. 2212 * 2213 * In the current implementation proposal, low level drivers 2214 * merely have to start the next command, pointed to by 2215 * next_link, done() is called as with unlinked commands. 2216 */ 2217 #ifdef LINKED 2218 case LINKED_CMD_COMPLETE: 2219 case LINKED_FLG_CMD_COMPLETE: 2220 /* Accept message by clearing ACK */ 2221 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2222 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2223 /* 2224 * Sanity check : A linked command should only terminate with 2225 * one of these messages if there are more linked commands 2226 * available. 2227 */ 2228 if (!cmd->next_link) { 2229 printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); 2230 sink = 1; 2231 do_abort(instance); 2232 return; 2233 } 2234 initialize_SCp(cmd->next_link); 2235 /* The next command is still part of this process */ 2236 cmd->next_link->tag = cmd->tag; 2237 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2238 dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2239 collect_stats(hostdata, cmd); 2240 cmd->scsi_done(cmd); 2241 cmd = hostdata->connected; 2242 break; 2243 #endif /* def LINKED */ 2244 case ABORT: 2245 case COMMAND_COMPLETE: 2246 /* Accept message by clearing ACK */ 2247 sink = 1; 2248 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2249 hostdata->connected = NULL; 2250 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2251 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2252 2253 /* 2254 * I'm not sure what the correct thing to do here is : 2255 * 2256 * If the command that just executed is NOT a request 2257 * sense, the obvious thing to do is to set the result 2258 * code to the values of the stored parameters. 2259 * 2260 * If it was a REQUEST SENSE command, we need some way 2261 * to differentiate between the failure code of the original 2262 * and the failure code of the REQUEST sense - the obvious 2263 * case is success, where we fall through and leave the result 2264 * code unchanged. 2265 * 2266 * The non-obvious place is where the REQUEST SENSE failed 2267 */ 2268 2269 if (cmd->cmnd[0] != REQUEST_SENSE) 2270 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2271 else if (status_byte(cmd->SCp.Status) != GOOD) 2272 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2273 2274 #ifdef AUTOSENSE 2275 if ((cmd->cmnd[0] == REQUEST_SENSE) && 2276 hostdata->ses.cmd_len) { 2277 scsi_eh_restore_cmnd(cmd, &hostdata->ses); 2278 hostdata->ses.cmd_len = 0 ; 2279 } 2280 2281 if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2282 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0); 2283 2284 dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); 2285 2286 LIST(cmd, hostdata->issue_queue); 2287 cmd->host_scribble = (unsigned char *) 2288 hostdata->issue_queue; 2289 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2290 dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); 2291 } else 2292 #endif /* def AUTOSENSE */ 2293 { 2294 collect_stats(hostdata, cmd); 2295 cmd->scsi_done(cmd); 2296 } 2297 2298 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2299 /* 2300 * Restore phase bits to 0 so an interrupted selection, 2301 * arbitration can resume. 2302 */ 2303 NCR5380_write(TARGET_COMMAND_REG, 0); 2304 2305 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2306 barrier(); 2307 return; 2308 case MESSAGE_REJECT: 2309 /* Accept message by clearing ACK */ 2310 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2311 switch (hostdata->last_message) { 2312 case HEAD_OF_QUEUE_TAG: 2313 case ORDERED_QUEUE_TAG: 2314 case SIMPLE_QUEUE_TAG: 2315 cmd->device->simple_tags = 0; 2316 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2317 break; 2318 default: 2319 break; 2320 } 2321 case DISCONNECT:{ 2322 /* Accept message by clearing ACK */ 2323 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2324 cmd->device->disconnect = 1; 2325 LIST(cmd, hostdata->disconnected_queue); 2326 cmd->host_scribble = (unsigned char *) 2327 hostdata->disconnected_queue; 2328 hostdata->connected = NULL; 2329 hostdata->disconnected_queue = cmd; 2330 dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); 2331 /* 2332 * Restore phase bits to 0 so an interrupted selection, 2333 * arbitration can resume. 2334 */ 2335 NCR5380_write(TARGET_COMMAND_REG, 0); 2336 2337 /* Enable reselect interrupts */ 2338 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2339 /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ 2340 /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ 2341 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2342 barrier(); 2343 return; 2344 } 2345 /* 2346 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2347 * operation, in violation of the SCSI spec so we can safely 2348 * ignore SAVE/RESTORE pointers calls. 2349 * 2350 * Unfortunately, some disks violate the SCSI spec and 2351 * don't issue the required SAVE_POINTERS message before 2352 * disconnecting, and we have to break spec to remain 2353 * compatible. 2354 */ 2355 case SAVE_POINTERS: 2356 case RESTORE_POINTERS: 2357 /* Accept message by clearing ACK */ 2358 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2359 break; 2360 case EXTENDED_MESSAGE: 2361 /* 2362 * Extended messages are sent in the following format : 2363 * Byte 2364 * 0 EXTENDED_MESSAGE == 1 2365 * 1 length (includes one byte for code, doesn't 2366 * include first two bytes) 2367 * 2 code 2368 * 3..length+1 arguments 2369 * 2370 * Start the extended message buffer with the EXTENDED_MESSAGE 2371 * byte, since spi_print_msg() wants the whole thing. 2372 */ 2373 extended_msg[0] = EXTENDED_MESSAGE; 2374 /* Accept first byte by clearing ACK */ 2375 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2376 dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); 2377 2378 len = 2; 2379 data = extended_msg + 1; 2380 phase = PHASE_MSGIN; 2381 NCR5380_transfer_pio(instance, &phase, &len, &data); 2382 2383 dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); 2384 2385 if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { 2386 /* Accept third byte by clearing ACK */ 2387 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2388 len = extended_msg[1] - 1; 2389 data = extended_msg + 3; 2390 phase = PHASE_MSGIN; 2391 2392 NCR5380_transfer_pio(instance, &phase, &len, &data); 2393 dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); 2394 2395 switch (extended_msg[2]) { 2396 case EXTENDED_SDTR: 2397 case EXTENDED_WDTR: 2398 case EXTENDED_MODIFY_DATA_POINTER: 2399 case EXTENDED_EXTENDED_IDENTIFY: 2400 tmp = 0; 2401 } 2402 } else if (len) { 2403 printk("scsi%d: error receiving extended message\n", instance->host_no); 2404 tmp = 0; 2405 } else { 2406 printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); 2407 tmp = 0; 2408 } 2409 /* Fall through to reject message */ 2410 2411 /* 2412 * If we get something weird that we aren't expecting, 2413 * reject it. 2414 */ 2415 default: 2416 if (!tmp) { 2417 printk("scsi%d: rejecting message ", instance->host_no); 2418 spi_print_msg(extended_msg); 2419 printk("\n"); 2420 } else if (tmp != EXTENDED_MESSAGE) 2421 scmd_printk(KERN_INFO, cmd, 2422 "rejecting unknown message %02x\n",tmp); 2423 else 2424 scmd_printk(KERN_INFO, cmd, 2425 "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); 2426 2427 msgout = MESSAGE_REJECT; 2428 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2429 break; 2430 } /* switch (tmp) */ 2431 break; 2432 case PHASE_MSGOUT: 2433 len = 1; 2434 data = &msgout; 2435 hostdata->last_message = msgout; 2436 NCR5380_transfer_pio(instance, &phase, &len, &data); 2437 if (msgout == ABORT) { 2438 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2439 hostdata->connected = NULL; 2440 cmd->result = DID_ERROR << 16; 2441 collect_stats(hostdata, cmd); 2442 cmd->scsi_done(cmd); 2443 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2444 return; 2445 } 2446 msgout = NOP; 2447 break; 2448 case PHASE_CMDOUT: 2449 len = cmd->cmd_len; 2450 data = cmd->cmnd; 2451 /* 2452 * XXX for performance reasons, on machines with a 2453 * PSEUDO-DMA architecture we should probably 2454 * use the dma transfer function. 2455 */ 2456 NCR5380_transfer_pio(instance, &phase, &len, &data); 2457 if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { 2458 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2459 dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2460 return; 2461 } 2462 break; 2463 case PHASE_STATIN: 2464 len = 1; 2465 data = &tmp; 2466 NCR5380_transfer_pio(instance, &phase, &len, &data); 2467 cmd->SCp.Status = tmp; 2468 break; 2469 default: 2470 printk("scsi%d : unknown phase\n", instance->host_no); 2471 NCR5380_dprint(NDEBUG_ALL, instance); 2472 } /* switch(phase) */ 2473 } /* if (tmp * SR_REQ) */ 2474 else { 2475 /* RvC: go to sleep if polling time expired 2476 */ 2477 if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { 2478 NCR5380_set_timer(hostdata, USLEEP_SLEEP); 2479 dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); 2480 return; 2481 } 2482 } 2483 } /* while (1) */ 2484 } 2485 2486 /* 2487 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2488 * 2489 * Purpose : does reselection, initializing the instance->connected 2490 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2491 * nexus has been reestablished, 2492 * 2493 * Inputs : instance - this instance of the NCR5380. 2494 * 2495 * Locks: io_request_lock held by caller if IRQ driven 2496 */ 2497 2498 static void NCR5380_reselect(struct Scsi_Host *instance) { 2499 NCR5380_local_declare(); 2500 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) 2501 instance->hostdata; 2502 unsigned char target_mask; 2503 unsigned char lun, phase; 2504 int len; 2505 unsigned char msg[3]; 2506 unsigned char *data; 2507 Scsi_Cmnd *tmp = NULL, *prev; 2508 int abort = 0; 2509 NCR5380_setup(instance); 2510 2511 /* 2512 * Disable arbitration, etc. since the host adapter obviously 2513 * lost, and tell an interrupted NCR5380_select() to restart. 2514 */ 2515 2516 NCR5380_write(MODE_REG, MR_BASE); 2517 hostdata->restart_select = 1; 2518 2519 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2520 dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); 2521 2522 /* 2523 * At this point, we have detected that our SCSI ID is on the bus, 2524 * SEL is true and BSY was false for at least one bus settle delay 2525 * (400 ns). 2526 * 2527 * We must assert BSY ourselves, until the target drops the SEL 2528 * signal. 2529 */ 2530 2531 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2532 2533 /* FIXME: timeout too long, must fail to workqueue */ 2534 if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) 2535 abort = 1; 2536 2537 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2538 2539 /* 2540 * Wait for target to go into MSGIN. 2541 * FIXME: timeout needed and fail to work queeu 2542 */ 2543 2544 if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) 2545 abort = 1; 2546 2547 len = 1; 2548 data = msg; 2549 phase = PHASE_MSGIN; 2550 NCR5380_transfer_pio(instance, &phase, &len, &data); 2551 2552 if (!(msg[0] & 0x80)) { 2553 printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); 2554 spi_print_msg(msg); 2555 abort = 1; 2556 } else { 2557 /* Accept message by clearing ACK */ 2558 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2559 lun = (msg[0] & 0x07); 2560 2561 /* 2562 * We need to add code for SCSI-II to track which devices have 2563 * I_T_L_Q nexuses established, and which have simple I_T_L 2564 * nexuses so we can chose to do additional data transfer. 2565 */ 2566 2567 /* 2568 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2569 * just reestablished, and remove it from the disconnected queue. 2570 */ 2571 2572 2573 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) 2574 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2575 ) { 2576 if (prev) { 2577 REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); 2578 prev->host_scribble = tmp->host_scribble; 2579 } else { 2580 REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); 2581 hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; 2582 } 2583 tmp->host_scribble = NULL; 2584 break; 2585 } 2586 if (!tmp) { 2587 printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); 2588 /* 2589 * Since we have an established nexus that we can't do anything with, 2590 * we must abort it. 2591 */ 2592 abort = 1; 2593 } 2594 } 2595 2596 if (abort) { 2597 do_abort(instance); 2598 } else { 2599 hostdata->connected = tmp; 2600 dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); 2601 } 2602 } 2603 2604 /* 2605 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 2606 * 2607 * Purpose : called by interrupt handler when DMA finishes or a phase 2608 * mismatch occurs (which would finish the DMA transfer). 2609 * 2610 * Inputs : instance - this instance of the NCR5380. 2611 * 2612 * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L 2613 * nexus has been reestablished, on failure NULL is returned. 2614 */ 2615 2616 #ifdef REAL_DMA 2617 static void NCR5380_dma_complete(NCR5380_instance * instance) { 2618 NCR5380_local_declare(); 2619 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2620 int transferred; 2621 NCR5380_setup(instance); 2622 2623 /* 2624 * XXX this might not be right. 2625 * 2626 * Wait for final byte to transfer, ie wait for ACK to go false. 2627 * 2628 * We should use the Last Byte Sent bit, unfortunately this is 2629 * not available on the 5380/5381 (only the various CMOS chips) 2630 * 2631 * FIXME: timeout, and need to handle long timeout/irq case 2632 */ 2633 2634 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); 2635 2636 NCR5380_write(MODE_REG, MR_BASE); 2637 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2638 2639 /* 2640 * The only places we should see a phase mismatch and have to send 2641 * data from the same set of pointers will be the data transfer 2642 * phases. So, residual, requested length are only important here. 2643 */ 2644 2645 if (!(hostdata->connected->SCp.phase & SR_CD)) { 2646 transferred = instance->dmalen - NCR5380_dma_residual(); 2647 hostdata->connected->SCp.this_residual -= transferred; 2648 hostdata->connected->SCp.ptr += transferred; 2649 } 2650 } 2651 #endif /* def REAL_DMA */ 2652 2653 /* 2654 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2655 * 2656 * Purpose : abort a command 2657 * 2658 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2659 * host byte of the result field to, if zero DID_ABORTED is 2660 * used. 2661 * 2662 * Returns : 0 - success, -1 on failure. 2663 * 2664 * XXX - there is no way to abort the command that is currently 2665 * connected, you have to wait for it to complete. If this is 2666 * a problem, we could implement longjmp() / setjmp(), setjmp() 2667 * called where the loop started in NCR5380_main(). 2668 * 2669 * Locks: host lock taken by caller 2670 */ 2671 2672 static int NCR5380_abort(Scsi_Cmnd * cmd) { 2673 NCR5380_local_declare(); 2674 struct Scsi_Host *instance = cmd->device->host; 2675 struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; 2676 Scsi_Cmnd *tmp, **prev; 2677 2678 printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); 2679 scsi_print_command(cmd); 2680 2681 NCR5380_print_status(instance); 2682 2683 NCR5380_setup(instance); 2684 2685 dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); 2686 dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); 2687 2688 #if 0 2689 /* 2690 * Case 1 : If the command is the currently executing command, 2691 * we'll set the aborted flag and return control so that 2692 * information transfer routine can exit cleanly. 2693 */ 2694 2695 if (hostdata->connected == cmd) { 2696 dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); 2697 hostdata->aborted = 1; 2698 /* 2699 * We should perform BSY checking, and make sure we haven't slipped 2700 * into BUS FREE. 2701 */ 2702 2703 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); 2704 /* 2705 * Since we can't change phases until we've completed the current 2706 * handshake, we have to source or sink a byte of data if the current 2707 * phase is not MSGOUT. 2708 */ 2709 2710 /* 2711 * Return control to the executing NCR drive so we can clear the 2712 * aborted flag and get back into our main loop. 2713 */ 2714 2715 return 0; 2716 } 2717 #endif 2718 2719 /* 2720 * Case 2 : If the command hasn't been issued yet, we simply remove it 2721 * from the issue queue. 2722 */ 2723 2724 dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); 2725 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) 2726 if (cmd == tmp) { 2727 REMOVE(5, *prev, tmp, tmp->host_scribble); 2728 (*prev) = (Scsi_Cmnd *) tmp->host_scribble; 2729 tmp->host_scribble = NULL; 2730 tmp->result = DID_ABORT << 16; 2731 dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); 2732 tmp->scsi_done(tmp); 2733 return SUCCESS; 2734 } 2735 #if (NDEBUG & NDEBUG_ABORT) 2736 /* KLL */ 2737 else if (prev == tmp) 2738 printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); 2739 #endif 2740 2741 /* 2742 * Case 3 : If any commands are connected, we're going to fail the abort 2743 * and let the high level SCSI driver retry at a later time or 2744 * issue a reset. 2745 * 2746 * Timeouts, and therefore aborted commands, will be highly unlikely 2747 * and handling them cleanly in this situation would make the common 2748 * case of noresets less efficient, and would pollute our code. So, 2749 * we fail. 2750 */ 2751 2752 if (hostdata->connected) { 2753 dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); 2754 return FAILED; 2755 } 2756 /* 2757 * Case 4: If the command is currently disconnected from the bus, and 2758 * there are no connected commands, we reconnect the I_T_L or 2759 * I_T_L_Q nexus associated with it, go into message out, and send 2760 * an abort message. 2761 * 2762 * This case is especially ugly. In order to reestablish the nexus, we 2763 * need to call NCR5380_select(). The easiest way to implement this 2764 * function was to abort if the bus was busy, and let the interrupt 2765 * handler triggered on the SEL for reselect take care of lost arbitrations 2766 * where necessary, meaning interrupts need to be enabled. 2767 * 2768 * When interrupts are enabled, the queues may change - so we 2769 * can't remove it from the disconnected queue before selecting it 2770 * because that could cause a failure in hashing the nexus if that 2771 * device reselected. 2772 * 2773 * Since the queues may change, we can't use the pointers from when we 2774 * first locate it. 2775 * 2776 * So, we must first locate the command, and if NCR5380_select() 2777 * succeeds, then issue the abort, relocate the command and remove 2778 * it from the disconnected queue. 2779 */ 2780 2781 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) 2782 if (cmd == tmp) { 2783 dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); 2784 2785 if (NCR5380_select(instance, cmd, (int) cmd->tag)) 2786 return FAILED; 2787 dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); 2788 2789 do_abort(instance); 2790 2791 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) 2792 if (cmd == tmp) { 2793 REMOVE(5, *prev, tmp, tmp->host_scribble); 2794 *prev = (Scsi_Cmnd *) tmp->host_scribble; 2795 tmp->host_scribble = NULL; 2796 tmp->result = DID_ABORT << 16; 2797 tmp->scsi_done(tmp); 2798 return SUCCESS; 2799 } 2800 } 2801 /* 2802 * Case 5 : If we reached this point, the command was not found in any of 2803 * the queues. 2804 * 2805 * We probably reached this point because of an unlikely race condition 2806 * between the command completing successfully and the abortion code, 2807 * so we won't panic, but we will notify the user in case something really 2808 * broke. 2809 */ 2810 printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" 2811 " before abortion\n", instance->host_no); 2812 return FAILED; 2813 } 2814 2815 2816 /* 2817 * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) 2818 * 2819 * Purpose : reset the SCSI bus. 2820 * 2821 * Returns : SUCCESS 2822 * 2823 * Locks: host lock taken by caller 2824 */ 2825 2826 static int NCR5380_bus_reset(Scsi_Cmnd * cmd) 2827 { 2828 struct Scsi_Host *instance = cmd->device->host; 2829 2830 NCR5380_local_declare(); 2831 NCR5380_setup(instance); 2832 NCR5380_print_status(instance); 2833 2834 spin_lock_irq(instance->host_lock); 2835 do_reset(instance); 2836 spin_unlock_irq(instance->host_lock); 2837 2838 return SUCCESS; 2839 } 2840