1/* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by 2 Sam Creasey. */ 3/* 4 * NCR 5380 generic driver routines. These should make it *trivial* 5 * to implement 5380 SCSI drivers under Linux with a non-trantor 6 * architecture. 7 * 8 * Note that these routines also work with NR53c400 family chips. 9 * 10 * Copyright 1993, Drew Eckhardt 11 * Visionary Computing 12 * (Unix and Linux consulting and custom programming) 13 * drew@colorado.edu 14 * +1 (303) 666-5836 15 * 16 * DISTRIBUTION RELEASE 6. 17 * 18 * For more information, please consult 19 * 20 * NCR 5380 Family 21 * SCSI Protocol Controller 22 * Databook 23 * 24 * NCR Microelectronics 25 * 1635 Aeroplaza Drive 26 * Colorado Springs, CO 80916 27 * 1+ (719) 578-3400 28 * 1+ (800) 334-5454 29 */ 30 31/* 32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in 33 * this file, too: 34 * 35 * - Some of the debug statements were incorrect (undefined variables and the 36 * like). I fixed that. 37 * 38 * - In information_transfer(), I think a #ifdef was wrong. Looking at the 39 * possible DMA transfer size should also happen for REAL_DMA. I added this 40 * in the #if statement. 41 * 42 * - When using real DMA, information_transfer() should return in a DATAOUT 43 * phase after starting the DMA. It has nothing more to do. 44 * 45 * - The interrupt service routine should run main after end of DMA, too (not 46 * only after RESELECTION interrupts). Additionally, it should _not_ test 47 * for more interrupts after running main, since a DMA process may have 48 * been started and interrupts are turned on now. The new int could happen 49 * inside the execution of NCR5380_intr(), leading to recursive 50 * calls. 51 * 52 * - I've added a function merge_contiguous_buffers() that tries to 53 * merge scatter-gather buffers that are located at contiguous 54 * physical addresses and can be processed with the same DMA setup. 55 * Since most scatter-gather operations work on a page (4K) of 56 * 4 buffers (1K), in more than 90% of all cases three interrupts and 57 * DMA setup actions are saved. 58 * 59 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA 60 * and USLEEP, because these were messing up readability and will never be 61 * needed for Atari SCSI. 62 * 63 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' 64 * stuff), and 'main' is executed in a bottom half if awoken by an 65 * interrupt. 66 * 67 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." 68 * constructs. In my eyes, this made the source rather unreadable, so I 69 * finally replaced that by the *_PRINTK() macros. 70 * 71 */ 72#include <scsi/scsi_dbg.h> 73#include <scsi/scsi_transport_spi.h> 74 75/* 76 * Further development / testing that should be done : 77 * 1. Test linked command handling code after Eric is ready with 78 * the high level code. 79 */ 80 81#if (NDEBUG & NDEBUG_LISTS) 82#define LIST(x,y) \ 83 { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \ 84 if ((x)==(y)) udelay(5); } 85#define REMOVE(w,x,y,z) \ 86 { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \ 87 (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \ 88 if ((x)==(y)) udelay(5); } 89#else 90#define LIST(x,y) 91#define REMOVE(w,x,y,z) 92#endif 93 94#ifndef notyet 95#undef LINKED 96#endif 97 98 99/* 100 * Using this file : 101 * This file a skeleton Linux SCSI driver for the NCR 5380 series 102 * of chips. To use it, you write an architecture specific functions 103 * and macros and include this file in your driver. 104 * 105 * These macros control options : 106 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 107 * for commands that return with a CHECK CONDITION status. 108 * 109 * LINKED - if defined, linked commands are supported. 110 * 111 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 112 * 113 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible 114 * 115 * These macros MUST be defined : 116 * 117 * NCR5380_read(register) - read from the specified register 118 * 119 * NCR5380_write(register, value) - write to the specific register 120 * 121 * Either real DMA *or* pseudo DMA may be implemented 122 * REAL functions : 123 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 124 * Note that the DMA setup functions should return the number of bytes 125 * that they were able to program the controller for. 126 * 127 * Also note that generic i386/PC versions of these macros are 128 * available as NCR5380_i386_dma_write_setup, 129 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 130 * 131 * NCR5380_dma_write_setup(instance, src, count) - initialize 132 * NCR5380_dma_read_setup(instance, dst, count) - initialize 133 * NCR5380_dma_residual(instance); - residual count 134 * 135 * PSEUDO functions : 136 * NCR5380_pwrite(instance, src, count) 137 * NCR5380_pread(instance, dst, count); 138 * 139 * If nothing specific to this implementation needs doing (ie, with external 140 * hardware), you must also define 141 * 142 * NCR5380_queue_command 143 * NCR5380_reset 144 * NCR5380_abort 145 * NCR5380_proc_info 146 * 147 * to be the global entry points into the specific driver, ie 148 * #define NCR5380_queue_command t128_queue_command. 149 * 150 * If this is not done, the routines will be defined as static functions 151 * with the NCR5380* names and the user must provide a globally 152 * accessible wrapper function. 153 * 154 * The generic driver is initialized by calling NCR5380_init(instance), 155 * after setting the appropriate host specific fields and ID. If the 156 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 157 * possible) function may be used. Before the specific driver initialization 158 * code finishes, NCR5380_print_options should be called. 159 */ 160 161static struct Scsi_Host *first_instance = NULL; 162static struct scsi_host_template *the_template = NULL; 163 164/* Macros ease life... :-) */ 165#define SETUP_HOSTDATA(in) \ 166 struct NCR5380_hostdata *hostdata = \ 167 (struct NCR5380_hostdata *)(in)->hostdata 168#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) 169 170#define NEXT(cmd) (*(struct scsi_cmnd **)&((cmd)->host_scribble)) 171#define NEXTADDR(cmd) ((struct scsi_cmnd **)&((cmd)->host_scribble)) 172 173#define HOSTNO instance->host_no 174#define H_NO(cmd) (cmd)->device->host->host_no 175 176#define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \ 177 (buffer)->offset) 178 179#ifdef SUPPORT_TAGS 180 181/* 182 * Functions for handling tagged queuing 183 * ===================================== 184 * 185 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: 186 * 187 * Using consecutive numbers for the tags is no good idea in my eyes. There 188 * could be wrong re-usings if the counter (8 bit!) wraps and some early 189 * command has been preempted for a long time. My solution: a bitfield for 190 * remembering used tags. 191 * 192 * There's also the problem that each target has a certain queue size, but we 193 * cannot know it in advance :-( We just see a QUEUE_FULL status being 194 * returned. So, in this case, the driver internal queue size assumption is 195 * reduced to the number of active tags if QUEUE_FULL is returned by the 196 * target. The command is returned to the mid-level, but with status changed 197 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL 198 * correctly. 199 * 200 * We're also not allowed running tagged commands as long as an untagged 201 * command is active. And REQUEST SENSE commands after a contingent allegiance 202 * condition _must_ be untagged. To keep track whether an untagged command has 203 * been issued, the host->busy array is still employed, as it is without 204 * support for tagged queuing. 205 * 206 * One could suspect that there are possible race conditions between 207 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the 208 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), 209 * which already guaranteed to be running at most once. It is also the only 210 * place where tags/LUNs are allocated. So no other allocation can slip 211 * between that pair, there could only happen a reselection, which can free a 212 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes 213 * important: the tag bit must be cleared before 'nr_allocated' is decreased. 214 */ 215 216/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ 217#undef TAG_NONE 218#define TAG_NONE 0xff 219 220/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */ 221#if (MAX_TAGS % 32) != 0 222#error "MAX_TAGS must be a multiple of 32!" 223#endif 224 225typedef struct { 226 char allocated[MAX_TAGS/8]; 227 int nr_allocated; 228 int queue_size; 229} TAG_ALLOC; 230 231static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ 232 233 234static void __init init_tags( void ) 235{ 236 int target, lun; 237 TAG_ALLOC *ta; 238 239 if (!setup_use_tagged_queuing) 240 return; 241 242 for( target = 0; target < 8; ++target ) { 243 for( lun = 0; lun < 8; ++lun ) { 244 ta = &TagAlloc[target][lun]; 245 memset( &ta->allocated, 0, MAX_TAGS/8 ); 246 ta->nr_allocated = 0; 247 /* At the beginning, assume the maximum queue size we could 248 * support (MAX_TAGS). This value will be decreased if the target 249 * returns QUEUE_FULL status. 250 */ 251 ta->queue_size = MAX_TAGS; 252 } 253 } 254} 255 256 257/* Check if we can issue a command to this LUN: First see if the LUN is marked 258 * busy by an untagged command. If the command should use tagged queuing, also 259 * check that there is a free tag and the target's queue won't overflow. This 260 * function should be called with interrupts disabled to avoid race 261 * conditions. 262 */ 263 264static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged) 265{ 266 SETUP_HOSTDATA(cmd->device->host); 267 268 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) 269 return( 1 ); 270 if (!should_be_tagged || 271 !setup_use_tagged_queuing || !cmd->device->tagged_supported) 272 return( 0 ); 273 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= 274 TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) { 275 TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n", 276 H_NO(cmd), cmd->device->id, cmd->device->lun ); 277 return( 1 ); 278 } 279 return( 0 ); 280} 281 282 283/* Allocate a tag for a command (there are no checks anymore, check_lun_busy() 284 * must be called before!), or reserve the LUN in 'busy' if the command is 285 * untagged. 286 */ 287 288static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged) 289{ 290 SETUP_HOSTDATA(cmd->device->host); 291 292 /* If we or the target don't support tagged queuing, allocate the LUN for 293 * an untagged command. 294 */ 295 if (!should_be_tagged || 296 !setup_use_tagged_queuing || !cmd->device->tagged_supported) { 297 cmd->tag = TAG_NONE; 298 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 299 TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged " 300 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); 301 } 302 else { 303 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; 304 305 cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS ); 306 set_bit( cmd->tag, &ta->allocated ); 307 ta->nr_allocated++; 308 TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d " 309 "(now %d tags in use)\n", 310 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun, 311 ta->nr_allocated ); 312 } 313} 314 315 316/* Mark the tag of command 'cmd' as free, or in case of an untagged command, 317 * unlock the LUN. 318 */ 319 320static void cmd_free_tag(struct scsi_cmnd *cmd) 321{ 322 SETUP_HOSTDATA(cmd->device->host); 323 324 if (cmd->tag == TAG_NONE) { 325 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 326 TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n", 327 H_NO(cmd), cmd->device->id, cmd->device->lun ); 328 } 329 else if (cmd->tag >= MAX_TAGS) { 330 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", 331 H_NO(cmd), cmd->tag ); 332 } 333 else { 334 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; 335 clear_bit( cmd->tag, &ta->allocated ); 336 ta->nr_allocated--; 337 TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n", 338 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun ); 339 } 340} 341 342 343static void free_all_tags( void ) 344{ 345 int target, lun; 346 TAG_ALLOC *ta; 347 348 if (!setup_use_tagged_queuing) 349 return; 350 351 for( target = 0; target < 8; ++target ) { 352 for( lun = 0; lun < 8; ++lun ) { 353 ta = &TagAlloc[target][lun]; 354 memset( &ta->allocated, 0, MAX_TAGS/8 ); 355 ta->nr_allocated = 0; 356 } 357 } 358} 359 360#endif /* SUPPORT_TAGS */ 361 362 363/* 364 * Function: void merge_contiguous_buffers(struct scsi_cmnd *cmd) 365 * 366 * Purpose: Try to merge several scatter-gather requests into one DMA 367 * transfer. This is possible if the scatter buffers lie on 368 * physical contiguous addresses. 369 * 370 * Parameters: struct scsi_cmnd *cmd 371 * The command to work on. The first scatter buffer's data are 372 * assumed to be already transfered into ptr/this_residual. 373 */ 374 375static void merge_contiguous_buffers(struct scsi_cmnd *cmd) 376{ 377 unsigned long endaddr; 378#if (NDEBUG & NDEBUG_MERGING) 379 unsigned long oldlen = cmd->SCp.this_residual; 380 int cnt = 1; 381#endif 382 383 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; 384 cmd->SCp.buffers_residual && 385 virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) { 386 387 MER_PRINTK("VTOP(%p) == %08lx -> merging\n", 388 SGADDR(&(cmd->SCp.buffer[1])), endaddr); 389#if (NDEBUG & NDEBUG_MERGING) 390 ++cnt; 391#endif 392 ++cmd->SCp.buffer; 393 --cmd->SCp.buffers_residual; 394 cmd->SCp.this_residual += cmd->SCp.buffer->length; 395 endaddr += cmd->SCp.buffer->length; 396 } 397#if (NDEBUG & NDEBUG_MERGING) 398 if (oldlen != cmd->SCp.this_residual) 399 MER_PRINTK("merged %d buffers from %p, new length %08x\n", 400 cnt, cmd->SCp.ptr, cmd->SCp.this_residual); 401#endif 402} 403 404/* 405 * Function : void initialize_SCp(struct scsi_cmnd *cmd) 406 * 407 * Purpose : initialize the saved data pointers for cmd to point to the 408 * start of the buffer. 409 * 410 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset. 411 */ 412 413static __inline__ void initialize_SCp(struct scsi_cmnd *cmd) 414{ 415 /* 416 * Initialize the Scsi Pointer field so that all of the commands in the 417 * various queues are valid. 418 */ 419 420 if (cmd->use_sg) { 421 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; 422 cmd->SCp.buffers_residual = cmd->use_sg - 1; 423 cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer); 424 cmd->SCp.this_residual = cmd->SCp.buffer->length; 425 426 /* ++roman: Try to merge some scatter-buffers if they are at 427 * contiguous physical addresses. 428 */ 429// merge_contiguous_buffers( cmd ); 430 } else { 431 cmd->SCp.buffer = NULL; 432 cmd->SCp.buffers_residual = 0; 433 cmd->SCp.ptr = (char *) cmd->request_buffer; 434 cmd->SCp.this_residual = cmd->request_bufflen; 435 } 436 437} 438 439#include <linux/delay.h> 440 441static struct { 442 unsigned char mask; 443 const char * name;} 444signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, 445 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, 446 { SR_SEL, "SEL" }, {0, NULL}}, 447basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}}, 448icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, 449 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, 450 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, 451 {0, NULL}}, 452mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, 453 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, 454 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, 455 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 456 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, 457 {0, NULL}}; 458 459/* 460 * Function : void NCR5380_print(struct Scsi_Host *instance) 461 * 462 * Purpose : print the SCSI bus signals for debugging purposes 463 * 464 * Input : instance - which NCR5380 465 */ 466 467static void NCR5380_print(struct Scsi_Host *instance) { 468 unsigned char status, data, basr, mr, icr, i; 469 unsigned long flags; 470 471 local_irq_save(flags); 472 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 473 status = NCR5380_read(STATUS_REG); 474 mr = NCR5380_read(MODE_REG); 475 icr = NCR5380_read(INITIATOR_COMMAND_REG); 476 basr = NCR5380_read(BUS_AND_STATUS_REG); 477 local_irq_restore(flags); 478 printk("STATUS_REG: %02x ", status); 479 for (i = 0; signals[i].mask ; ++i) 480 if (status & signals[i].mask) 481 printk(",%s", signals[i].name); 482 printk("\nBASR: %02x ", basr); 483 for (i = 0; basrs[i].mask ; ++i) 484 if (basr & basrs[i].mask) 485 printk(",%s", basrs[i].name); 486 printk("\nICR: %02x ", icr); 487 for (i = 0; icrs[i].mask; ++i) 488 if (icr & icrs[i].mask) 489 printk(",%s", icrs[i].name); 490 printk("\nMODE: %02x ", mr); 491 for (i = 0; mrs[i].mask; ++i) 492 if (mr & mrs[i].mask) 493 printk(",%s", mrs[i].name); 494 printk("\n"); 495} 496 497static struct { 498 unsigned char value; 499 const char *name; 500} phases[] = { 501 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, 502 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, 503 {PHASE_UNKNOWN, "UNKNOWN"}}; 504 505/* 506 * Function : void NCR5380_print_phase(struct Scsi_Host *instance) 507 * 508 * Purpose : print the current SCSI phase for debugging purposes 509 * 510 * Input : instance - which NCR5380 511 */ 512 513static void NCR5380_print_phase(struct Scsi_Host *instance) 514{ 515 unsigned char status; 516 int i; 517 518 status = NCR5380_read(STATUS_REG); 519 if (!(status & SR_REQ)) 520 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); 521 else { 522 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && 523 (phases[i].value != (status & PHASE_MASK)); ++i); 524 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); 525 } 526} 527 528 529/* 530 * ++roman: New scheme of calling NCR5380_main() 531 * 532 * If we're not in an interrupt, we can call our main directly, it cannot be 533 * already running. Else, we queue it on a task queue, if not 'main_running' 534 * tells us that a lower level is already executing it. This way, 535 * 'main_running' needs not be protected in a special way. 536 * 537 * queue_main() is a utility function for putting our main onto the task 538 * queue, if main_running is false. It should be called only from a 539 * interrupt or bottom half. 540 */ 541 542#include <linux/workqueue.h> 543#include <linux/interrupt.h> 544 545static volatile int main_running = 0; 546static DECLARE_WORK(NCR5380_tqueue, NCR5380_main); 547 548static __inline__ void queue_main(void) 549{ 550 if (!main_running) { 551 /* If in interrupt and NCR5380_main() not already running, 552 queue it on the 'immediate' task queue, to be processed 553 immediately after the current interrupt processing has 554 finished. */ 555 schedule_work(&NCR5380_tqueue); 556 } 557 /* else: nothing to do: the running NCR5380_main() will pick up 558 any newly queued command. */ 559} 560 561 562static inline void NCR5380_all_init (void) 563{ 564 static int done = 0; 565 if (!done) { 566 INI_PRINTK("scsi : NCR5380_all_init()\n"); 567 done = 1; 568 } 569} 570 571 572/* 573 * Function : void NCR58380_print_options (struct Scsi_Host *instance) 574 * 575 * Purpose : called by probe code indicating the NCR5380 driver 576 * options that were selected. 577 * 578 * Inputs : instance, pointer to this instance. Unused. 579 */ 580 581static void __init NCR5380_print_options (struct Scsi_Host *instance) 582{ 583 printk(" generic options" 584#ifdef AUTOSENSE 585 " AUTOSENSE" 586#endif 587#ifdef REAL_DMA 588 " REAL DMA" 589#endif 590#ifdef PARITY 591 " PARITY" 592#endif 593#ifdef SUPPORT_TAGS 594 " SCSI-2 TAGGED QUEUING" 595#endif 596 ); 597 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 598} 599 600/* 601 * Function : void NCR5380_print_status (struct Scsi_Host *instance) 602 * 603 * Purpose : print commands in the various queues, called from 604 * NCR5380_abort and NCR5380_debug to aid debugging. 605 * 606 * Inputs : instance, pointer to this instance. 607 */ 608 609static void NCR5380_print_status (struct Scsi_Host *instance) 610{ 611 char *pr_bfr; 612 char *start; 613 int len; 614 615 NCR_PRINT(NDEBUG_ANY); 616 NCR_PRINT_PHASE(NDEBUG_ANY); 617 618 pr_bfr = (char *) __get_free_page(GFP_ATOMIC); 619 if (!pr_bfr) { 620 printk("NCR5380_print_status: no memory for print buffer\n"); 621 return; 622 } 623 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0); 624 pr_bfr[len] = 0; 625 printk("\n%s\n", pr_bfr); 626 free_page((unsigned long) pr_bfr); 627} 628 629 630/******************************************/ 631/* 632 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 633 * 634 * *buffer: I/O buffer 635 * **start: if inout == FALSE pointer into buffer where user read should start 636 * offset: current offset 637 * length: length of buffer 638 * hostno: Scsi_Host host_no 639 * inout: TRUE - user is writing; FALSE - user is reading 640 * 641 * Return the number of bytes read from or written 642*/ 643 644#undef SPRINTF 645#define SPRINTF(fmt,args...) \ 646 do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \ 647 pos += sprintf(pos, fmt , ## args); } while(0) 648static 649char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer, 650 int length); 651 652static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, 653 char **start, off_t offset, int length, int inout) 654{ 655 char *pos = buffer; 656 struct NCR5380_hostdata *hostdata; 657 struct scsi_cmnd *ptr; 658 unsigned long flags; 659 off_t begin = 0; 660#define check_offset() \ 661 do { \ 662 if (pos - buffer < offset - begin) { \ 663 begin += pos - buffer; \ 664 pos = buffer; \ 665 } \ 666 } while (0) 667 668 hostdata = (struct NCR5380_hostdata *)instance->hostdata; 669 670 if (inout) { /* Has data been written to the file ? */ 671 return(-ENOSYS); /* Currently this is a no-op */ 672 } 673 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); 674 check_offset(); 675 local_irq_save(flags); 676 SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't"); 677 check_offset(); 678 if (!hostdata->connected) 679 SPRINTF("scsi%d: no currently connected command\n", HOSTNO); 680 else 681 pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected, 682 pos, buffer, length); 683 SPRINTF("scsi%d: issue_queue\n", HOSTNO); 684 check_offset(); 685 for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) 686 { 687 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); 688 check_offset(); 689 } 690 691 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO); 692 check_offset(); 693 for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr; 694 ptr = NEXT(ptr)) { 695 pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); 696 check_offset(); 697 } 698 699 local_irq_restore(flags); 700 *start = buffer + (offset - begin); 701 if (pos - buffer < offset - begin) 702 return 0; 703 else if (pos - buffer - (offset - begin) < length) 704 return pos - buffer - (offset - begin); 705 return length; 706} 707 708static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer, 709 int length) 710{ 711 int i, s; 712 unsigned char *command; 713 SPRINTF("scsi%d: destination target %d, lun %d\n", 714 H_NO(cmd), cmd->device->id, cmd->device->lun); 715 SPRINTF(" command = "); 716 command = cmd->cmnd; 717 SPRINTF("%2d (0x%02x)", command[0], command[0]); 718 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 719 SPRINTF(" %02x", command[i]); 720 SPRINTF("\n"); 721 return pos; 722} 723 724 725/* 726 * Function : void NCR5380_init (struct Scsi_Host *instance) 727 * 728 * Purpose : initializes *instance and corresponding 5380 chip. 729 * 730 * Inputs : instance - instantiation of the 5380 driver. 731 * 732 * Notes : I assume that the host, hostno, and id bits have been 733 * set correctly. I don't care about the irq and other fields. 734 * 735 */ 736 737static int NCR5380_init (struct Scsi_Host *instance, int flags) 738{ 739 int i; 740 SETUP_HOSTDATA(instance); 741 742 NCR5380_all_init(); 743 744 hostdata->aborted = 0; 745 hostdata->id_mask = 1 << instance->this_id; 746 hostdata->id_higher_mask = 0; 747 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 748 if (i > hostdata->id_mask) 749 hostdata->id_higher_mask |= i; 750 for (i = 0; i < 8; ++i) 751 hostdata->busy[i] = 0; 752#ifdef SUPPORT_TAGS 753 init_tags(); 754#endif 755#if defined(REAL_DMA) 756 hostdata->dma_len = 0; 757#endif 758 hostdata->targets_present = 0; 759 hostdata->connected = NULL; 760 hostdata->issue_queue = NULL; 761 hostdata->disconnected_queue = NULL; 762 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; 763 764 if (!the_template) { 765 the_template = instance->hostt; 766 first_instance = instance; 767 } 768 769 770#ifndef AUTOSENSE 771 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) 772 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" 773 " without AUTOSENSE option, contingent allegiance conditions may\n" 774 " be incorrectly cleared.\n", HOSTNO); 775#endif /* def AUTOSENSE */ 776 777 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 778 NCR5380_write(MODE_REG, MR_BASE); 779 NCR5380_write(TARGET_COMMAND_REG, 0); 780 NCR5380_write(SELECT_ENABLE_REG, 0); 781 782 return 0; 783} 784 785/* 786 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd, 787 * void (*done)(struct scsi_cmnd *)) 788 * 789 * Purpose : enqueues a SCSI command 790 * 791 * Inputs : cmd - SCSI command, done - function called on completion, with 792 * a pointer to the command descriptor. 793 * 794 * Returns : 0 795 * 796 * Side effects : 797 * cmd is added to the per instance issue_queue, with minor 798 * twiddling done to the host specific fields of cmd. If the 799 * main coroutine is not running, it is restarted. 800 * 801 */ 802 803/* Only make static if a wrapper function is used */ 804static int NCR5380_queue_command(struct scsi_cmnd *cmd, 805 void (*done)(struct scsi_cmnd *)) 806{ 807 SETUP_HOSTDATA(cmd->device->host); 808 struct scsi_cmnd *tmp; 809 unsigned long flags; 810 811#if (NDEBUG & NDEBUG_NO_WRITE) 812 switch (cmd->cmnd[0]) { 813 case WRITE_6: 814 case WRITE_10: 815 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", 816 H_NO(cmd)); 817 cmd->result = (DID_ERROR << 16); 818 done(cmd); 819 return 0; 820 } 821#endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 822 823 824#ifdef NCR5380_STATS 825# ifdef NCR5380_STAT_LIMIT 826 if (cmd->request_bufflen > NCR5380_STAT_LIMIT) 827# endif 828 switch (cmd->cmnd[0]) 829 { 830 case WRITE: 831 case WRITE_6: 832 case WRITE_10: 833 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 834 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; 835 hostdata->pendingw++; 836 break; 837 case READ: 838 case READ_6: 839 case READ_10: 840 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 841 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; 842 hostdata->pendingr++; 843 break; 844 } 845#endif 846 847 /* 848 * We use the host_scribble field as a pointer to the next command 849 * in a queue 850 */ 851 852 NEXT(cmd) = NULL; 853 cmd->scsi_done = done; 854 855 cmd->result = 0; 856 857 858 /* 859 * Insert the cmd into the issue queue. Note that REQUEST SENSE 860 * commands are added to the head of the queue since any command will 861 * clear the contingent allegiance condition that exists and the 862 * sense data is only guaranteed to be valid while the condition exists. 863 */ 864 865 local_irq_save(flags); 866 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. 867 * Otherwise a running NCR5380_main may steal the lock. 868 * Lock before actually inserting due to fairness reasons explained in 869 * atari_scsi.c. If we insert first, then it's impossible for this driver 870 * to release the lock. 871 * Stop timer for this command while waiting for the lock, or timeouts 872 * may happen (and they really do), and it's no good if the command doesn't 873 * appear in any of the queues. 874 * ++roman: Just disabling the NCR interrupt isn't sufficient here, 875 * because also a timer int can trigger an abort or reset, which would 876 * alter queues and touch the lock. 877 */ 878 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 879 LIST(cmd, hostdata->issue_queue); 880 NEXT(cmd) = hostdata->issue_queue; 881 hostdata->issue_queue = cmd; 882 } else { 883 for (tmp = (struct scsi_cmnd *)hostdata->issue_queue; 884 NEXT(tmp); tmp = NEXT(tmp)) 885 ; 886 LIST(cmd, tmp); 887 NEXT(tmp) = cmd; 888 } 889 890 local_irq_restore(flags); 891 892 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd), 893 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); 894 895 /* If queue_command() is called from an interrupt (real one or bottom 896 * half), we let queue_main() do the job of taking care about main. If it 897 * is already running, this is a no-op, else main will be queued. 898 * 899 * If we're not in an interrupt, we can call NCR5380_main() 900 * unconditionally, because it cannot be already running. 901 */ 902 if (in_interrupt() || ((flags >> 8) & 7) >= 6) 903 queue_main(); 904 else 905 NCR5380_main(NULL); 906 return 0; 907} 908 909/* 910 * Function : NCR5380_main (void) 911 * 912 * Purpose : NCR5380_main is a coroutine that runs as long as more work can 913 * be done on the NCR5380 host adapters in a system. Both 914 * NCR5380_queue_command() and NCR5380_intr() will try to start it 915 * in case it is not running. 916 * 917 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should 918 * reenable them. This prevents reentrancy and kernel stack overflow. 919 */ 920 921static void NCR5380_main (struct work_struct *bl) 922{ 923 struct scsi_cmnd *tmp, *prev; 924 struct Scsi_Host *instance = first_instance; 925 struct NCR5380_hostdata *hostdata = HOSTDATA(instance); 926 int done; 927 unsigned long flags; 928 929 /* 930 * We run (with interrupts disabled) until we're sure that none of 931 * the host adapters have anything that can be done, at which point 932 * we set main_running to 0 and exit. 933 * 934 * Interrupts are enabled before doing various other internal 935 * instructions, after we've decided that we need to run through 936 * the loop again. 937 * 938 * this should prevent any race conditions. 939 * 940 * ++roman: Just disabling the NCR interrupt isn't sufficient here, 941 * because also a timer int can trigger an abort or reset, which can 942 * alter queues and touch the Falcon lock. 943 */ 944 945 /* Tell int handlers main() is now already executing. Note that 946 no races are possible here. If an int comes in before 947 'main_running' is set here, and queues/executes main via the 948 task queue, it doesn't do any harm, just this instance of main 949 won't find any work left to do. */ 950 if (main_running) 951 return; 952 main_running = 1; 953 954 local_save_flags(flags); 955 do { 956 local_irq_disable(); /* Freeze request queues */ 957 done = 1; 958 959 if (!hostdata->connected) { 960 MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO ); 961 /* 962 * Search through the issue_queue for a command destined 963 * for a target that's not busy. 964 */ 965#if (NDEBUG & NDEBUG_LISTS) 966 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL; 967 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) 968 ; 969 if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/ 970#endif 971 for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, 972 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) { 973 974#if (NDEBUG & NDEBUG_LISTS) 975 if (prev != tmp) 976 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", 977 tmp, tmp->target, hostdata->busy[tmp->target], 978 tmp->lun); 979#endif 980 /* When we find one, remove it from the issue queue. */ 981 /* ++guenther: possible race with Falcon locking */ 982 if ( 983#ifdef SUPPORT_TAGS 984 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) 985#else 986 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) 987#endif 988 ) { 989 /* ++guenther: just to be sure, this must be atomic */ 990 local_irq_disable(); 991 if (prev) { 992 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); 993 NEXT(prev) = NEXT(tmp); 994 } else { 995 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); 996 hostdata->issue_queue = NEXT(tmp); 997 } 998 NEXT(tmp) = NULL; 999 1000 /* reenable interrupts after finding one */ 1001 local_irq_restore(flags); 1002 1003 /* 1004 * Attempt to establish an I_T_L nexus here. 1005 * On success, instance->hostdata->connected is set. 1006 * On failure, we must add the command back to the 1007 * issue queue so we can keep trying. 1008 */ 1009 MAIN_PRINTK("scsi%d: main(): command for target %d " 1010 "lun %d removed from issue_queue\n", 1011 HOSTNO, tmp->target, tmp->lun); 1012 /* 1013 * REQUEST SENSE commands are issued without tagged 1014 * queueing, even on SCSI-II devices because the 1015 * contingent allegiance condition exists for the 1016 * entire unit. 1017 */ 1018 /* ++roman: ...and the standard also requires that 1019 * REQUEST SENSE command are untagged. 1020 */ 1021 1022#ifdef SUPPORT_TAGS 1023 cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE ); 1024#endif 1025 if (!NCR5380_select(instance, tmp, 1026 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : 1027 TAG_NEXT)) { 1028 break; 1029 } else { 1030 local_irq_disable(); 1031 LIST(tmp, hostdata->issue_queue); 1032 NEXT(tmp) = hostdata->issue_queue; 1033 hostdata->issue_queue = tmp; 1034#ifdef SUPPORT_TAGS 1035 cmd_free_tag( tmp ); 1036#endif 1037 local_irq_restore(flags); 1038 MAIN_PRINTK("scsi%d: main(): select() failed, " 1039 "returned to issue_queue\n", HOSTNO); 1040 if (hostdata->connected) 1041 break; 1042 } 1043 } /* if target/lun/target queue is not busy */ 1044 } /* for issue_queue */ 1045 } /* if (!hostdata->connected) */ 1046 if (hostdata->connected 1047#ifdef REAL_DMA 1048 && !hostdata->dma_len 1049#endif 1050 ) { 1051 local_irq_restore(flags); 1052 MAIN_PRINTK("scsi%d: main: performing information transfer\n", 1053 HOSTNO); 1054 NCR5380_information_transfer(instance); 1055 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO); 1056 done = 0; 1057 } 1058 } while (!done); 1059 1060 /* Better allow ints _after_ 'main_running' has been cleared, else 1061 an interrupt could believe we'll pick up the work it left for 1062 us, but we won't see it anymore here... */ 1063 main_running = 0; 1064 local_irq_restore(flags); 1065} 1066 1067 1068#ifdef REAL_DMA 1069/* 1070 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 1071 * 1072 * Purpose : Called by interrupt handler when DMA finishes or a phase 1073 * mismatch occurs (which would finish the DMA transfer). 1074 * 1075 * Inputs : instance - this instance of the NCR5380. 1076 * 1077 */ 1078 1079static void NCR5380_dma_complete( struct Scsi_Host *instance ) 1080{ 1081 SETUP_HOSTDATA(instance); 1082 int transfered; 1083 unsigned char **data; 1084 volatile int *count; 1085 1086 if (!hostdata->connected) { 1087 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " 1088 "no connected cmd\n", HOSTNO); 1089 return; 1090 } 1091 1092 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", 1093 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), 1094 NCR5380_read(STATUS_REG)); 1095 1096 if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { 1097 printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO); 1098 printk("please e-mail sammy@sammy.net with a description of how this\n"); 1099 printk("error was produced.\n"); 1100 BUG(); 1101 } 1102 1103 /* make sure we're not stuck in a data phase */ 1104 if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | 1105 BASR_ACK)) == 1106 (BASR_PHASE_MATCH | BASR_ACK)) { 1107 printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG)); 1108 printk("scsi%d: bus stuck in data phase -- probably a single byte " 1109 "overrun!\n", HOSTNO); 1110 printk("not prepared for this error!\n"); 1111 printk("please e-mail sammy@sammy.net with a description of how this\n"); 1112 printk("error was produced.\n"); 1113 BUG(); 1114 } 1115 1116 1117 1118 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1119 NCR5380_write(MODE_REG, MR_BASE); 1120 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1121 1122 transfered = hostdata->dma_len - NCR5380_dma_residual(instance); 1123 hostdata->dma_len = 0; 1124 1125 data = (unsigned char **) &(hostdata->connected->SCp.ptr); 1126 count = &(hostdata->connected->SCp.this_residual); 1127 *data += transfered; 1128 *count -= transfered; 1129 1130} 1131#endif /* REAL_DMA */ 1132 1133 1134/* 1135 * Function : void NCR5380_intr (int irq) 1136 * 1137 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1138 * from the disconnected queue, and restarting NCR5380_main() 1139 * as required. 1140 * 1141 * Inputs : int irq, irq that caused this interrupt. 1142 * 1143 */ 1144 1145static irqreturn_t NCR5380_intr (int irq, void *dev_id) 1146{ 1147 struct Scsi_Host *instance = first_instance; 1148 int done = 1, handled = 0; 1149 unsigned char basr; 1150 1151 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO); 1152 1153 /* Look for pending interrupts */ 1154 basr = NCR5380_read(BUS_AND_STATUS_REG); 1155 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr); 1156 /* dispatch to appropriate routine if found and done=0 */ 1157 if (basr & BASR_IRQ) { 1158 NCR_PRINT(NDEBUG_INTR); 1159 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { 1160 done = 0; 1161// ENABLE_IRQ(); 1162 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO); 1163 NCR5380_reselect(instance); 1164 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1165 } 1166 else if (basr & BASR_PARITY_ERROR) { 1167 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO); 1168 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1169 } 1170 else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1171 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO); 1172 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1173 } 1174 else { 1175 /* 1176 * The rest of the interrupt conditions can occur only during a 1177 * DMA transfer 1178 */ 1179 1180#if defined(REAL_DMA) 1181 /* 1182 * We should only get PHASE MISMATCH and EOP interrupts if we have 1183 * DMA enabled, so do a sanity check based on the current setting 1184 * of the MODE register. 1185 */ 1186 1187 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && 1188 ((basr & BASR_END_DMA_TRANSFER) || 1189 !(basr & BASR_PHASE_MATCH))) { 1190 1191 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); 1192 NCR5380_dma_complete( instance ); 1193 done = 0; 1194// ENABLE_IRQ(); 1195 } else 1196#endif /* REAL_DMA */ 1197 { 1198/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ 1199 if (basr & BASR_PHASE_MATCH) 1200 INT_PRINTK("scsi%d: unknown interrupt, " 1201 "BASR 0x%x, MR 0x%x, SR 0x%x\n", 1202 HOSTNO, basr, NCR5380_read(MODE_REG), 1203 NCR5380_read(STATUS_REG)); 1204 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1205#ifdef SUN3_SCSI_VME 1206 dregs->csr |= CSR_DMA_ENABLE; 1207#endif 1208 } 1209 } /* if !(SELECTION || PARITY) */ 1210 handled = 1; 1211 } /* BASR & IRQ */ 1212 else { 1213 1214 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " 1215 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, 1216 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); 1217 (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1218#ifdef SUN3_SCSI_VME 1219 dregs->csr |= CSR_DMA_ENABLE; 1220#endif 1221 } 1222 1223 if (!done) { 1224 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO); 1225 /* Put a call to NCR5380_main() on the queue... */ 1226 queue_main(); 1227 } 1228 return IRQ_RETVAL(handled); 1229} 1230 1231#ifdef NCR5380_STATS 1232static void collect_stats(struct NCR5380_hostdata *hostdata, 1233 struct scsi_cmnd *cmd) 1234{ 1235# ifdef NCR5380_STAT_LIMIT 1236 if (cmd->request_bufflen > NCR5380_STAT_LIMIT) 1237# endif 1238 switch (cmd->cmnd[0]) 1239 { 1240 case WRITE: 1241 case WRITE_6: 1242 case WRITE_10: 1243 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); 1244 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/ 1245 hostdata->pendingw--; 1246 break; 1247 case READ: 1248 case READ_6: 1249 case READ_10: 1250 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); 1251 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/ 1252 hostdata->pendingr--; 1253 break; 1254 } 1255} 1256#endif 1257 1258/* 1259 * Function : int NCR5380_select(struct Scsi_Host *instance, 1260 * struct scsi_cmnd *cmd, int tag); 1261 * 1262 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1263 * including ARBITRATION, SELECTION, and initial message out for 1264 * IDENTIFY and queue messages. 1265 * 1266 * Inputs : instance - instantiation of the 5380 driver on which this 1267 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1268 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1269 * the command that is presently connected. 1270 * 1271 * Returns : -1 if selection could not execute for some reason, 1272 * 0 if selection succeeded or failed because the target 1273 * did not respond. 1274 * 1275 * Side effects : 1276 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1277 * with registers as they should have been on entry - ie 1278 * SELECT_ENABLE will be set appropriately, the NCR5380 1279 * will cease to drive any SCSI bus signals. 1280 * 1281 * If successful : I_T_L or I_T_L_Q nexus will be established, 1282 * instance->connected will be set to cmd. 1283 * SELECT interrupt will be disabled. 1284 * 1285 * If failed (no target) : cmd->scsi_done() will be called, and the 1286 * cmd->result host byte set to DID_BAD_TARGET. 1287 */ 1288 1289static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd, 1290 int tag) 1291{ 1292 SETUP_HOSTDATA(instance); 1293 unsigned char tmp[3], phase; 1294 unsigned char *data; 1295 int len; 1296 unsigned long timeout; 1297 unsigned long flags; 1298 1299 hostdata->restart_select = 0; 1300 NCR_PRINT(NDEBUG_ARBITRATION); 1301 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO, 1302 instance->this_id); 1303 1304 /* 1305 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1306 * data bus during SELECTION. 1307 */ 1308 1309 local_irq_save(flags); 1310 if (hostdata->connected) { 1311 local_irq_restore(flags); 1312 return -1; 1313 } 1314 NCR5380_write(TARGET_COMMAND_REG, 0); 1315 1316 1317 /* 1318 * Start arbitration. 1319 */ 1320 1321 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1322 NCR5380_write(MODE_REG, MR_ARBITRATE); 1323 1324 local_irq_restore(flags); 1325 1326 /* Wait for arbitration logic to complete */ 1327#if NCR_TIMEOUT 1328 { 1329 unsigned long timeout = jiffies + 2*NCR_TIMEOUT; 1330 1331 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) 1332 && time_before(jiffies, timeout) && !hostdata->connected) 1333 ; 1334 if (time_after_eq(jiffies, timeout)) 1335 { 1336 printk("scsi : arbitration timeout at %d\n", __LINE__); 1337 NCR5380_write(MODE_REG, MR_BASE); 1338 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1339 return -1; 1340 } 1341 } 1342#else /* NCR_TIMEOUT */ 1343 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) 1344 && !hostdata->connected); 1345#endif 1346 1347 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO); 1348 1349 if (hostdata->connected) { 1350 NCR5380_write(MODE_REG, MR_BASE); 1351 return -1; 1352 } 1353 /* 1354 * The arbitration delay is 2.2us, but this is a minimum and there is 1355 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1356 * the integral nature of udelay(). 1357 * 1358 */ 1359 1360 udelay(3); 1361 1362 /* Check for lost arbitration */ 1363 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1364 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || 1365 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1366 hostdata->connected) { 1367 NCR5380_write(MODE_REG, MR_BASE); 1368 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", 1369 HOSTNO); 1370 return -1; 1371 } 1372 1373 /* after/during arbitration, BSY should be asserted. 1374 IBM DPES-31080 Version S31Q works now */ 1375 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ 1376 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL | 1377 ICR_ASSERT_BSY ) ; 1378 1379 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1380 hostdata->connected) { 1381 NCR5380_write(MODE_REG, MR_BASE); 1382 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1383 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", 1384 HOSTNO); 1385 return -1; 1386 } 1387 1388 /* 1389 * Again, bus clear + bus settle time is 1.2us, however, this is 1390 * a minimum so we'll udelay ceil(1.2) 1391 */ 1392 1393#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY 1394 /* ++roman: But some targets (see above :-) seem to need a bit more... */ 1395 udelay(15); 1396#else 1397 udelay(2); 1398#endif 1399 1400 if (hostdata->connected) { 1401 NCR5380_write(MODE_REG, MR_BASE); 1402 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1403 return -1; 1404 } 1405 1406 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO); 1407 1408 /* 1409 * Now that we have won arbitration, start Selection process, asserting 1410 * the host and target ID's on the SCSI bus. 1411 */ 1412 1413 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); 1414 1415 /* 1416 * Raise ATN while SEL is true before BSY goes false from arbitration, 1417 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1418 * phase immediately after selection. 1419 */ 1420 1421 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | 1422 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); 1423 NCR5380_write(MODE_REG, MR_BASE); 1424 1425 /* 1426 * Reselect interrupts must be turned off prior to the dropping of BSY, 1427 * otherwise we will trigger an interrupt. 1428 */ 1429 1430 if (hostdata->connected) { 1431 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1432 return -1; 1433 } 1434 1435 NCR5380_write(SELECT_ENABLE_REG, 0); 1436 1437 /* 1438 * The initiator shall then wait at least two deskew delays and release 1439 * the BSY signal. 1440 */ 1441 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1442 1443 /* Reset BSY */ 1444 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | 1445 ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1446 1447 /* 1448 * Something weird happens when we cease to drive BSY - looks 1449 * like the board/chip is letting us do another read before the 1450 * appropriate propagation delay has expired, and we're confusing 1451 * a BSY signal from ourselves as the target's response to SELECTION. 1452 * 1453 * A small delay (the 'C++' frontend breaks the pipeline with an 1454 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1455 * tighter 'C' code breaks and requires this) solves the problem - 1456 * the 1 us delay is arbitrary, and only used because this delay will 1457 * be the same on other platforms and since it works here, it should 1458 * work there. 1459 * 1460 * wingel suggests that this could be due to failing to wait 1461 * one deskew delay. 1462 */ 1463 1464 udelay(1); 1465 1466 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); 1467 1468 /* 1469 * The SCSI specification calls for a 250 ms timeout for the actual 1470 * selection. 1471 */ 1472 1473 timeout = jiffies + 25; 1474 1475 1476 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)); 1477 1478 /* 1479 * No less than two deskew delays after the initiator detects the 1480 * BSY signal is true, it shall release the SEL signal and may 1481 * change the DATA BUS. -wingel 1482 */ 1483 1484 udelay(1); 1485 1486 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1487 1488 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1489 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1490 if (hostdata->targets_present & (1 << cmd->device->id)) { 1491 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); 1492 if (hostdata->restart_select) 1493 printk(KERN_NOTICE "\trestart select\n"); 1494 NCR_PRINT(NDEBUG_ANY); 1495 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1496 return -1; 1497 } 1498 cmd->result = DID_BAD_TARGET << 16; 1499#ifdef NCR5380_STATS 1500 collect_stats(hostdata, cmd); 1501#endif 1502#ifdef SUPPORT_TAGS 1503 cmd_free_tag( cmd ); 1504#endif 1505 cmd->scsi_done(cmd); 1506 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1507 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO); 1508 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1509 return 0; 1510 } 1511 1512 hostdata->targets_present |= (1 << cmd->device->id); 1513 1514 1515 /* Wait for start of REQ/ACK handshake */ 1516 while (!(NCR5380_read(STATUS_REG) & SR_REQ)); 1517 1518 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n", 1519 HOSTNO, cmd->device->id); 1520 tmp[0] = IDENTIFY(1, cmd->device->lun); 1521 1522#ifdef SUPPORT_TAGS 1523 if (cmd->tag != TAG_NONE) { 1524 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; 1525 tmp[2] = cmd->tag; 1526 len = 3; 1527 } else 1528 len = 1; 1529#else 1530 len = 1; 1531 cmd->tag=0; 1532#endif /* SUPPORT_TAGS */ 1533 1534 /* Send message(s) */ 1535 data = tmp; 1536 phase = PHASE_MSGOUT; 1537 NCR5380_transfer_pio(instance, &phase, &len, &data); 1538 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO); 1539 hostdata->connected = cmd; 1540#ifndef SUPPORT_TAGS 1541 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1542#endif 1543#ifdef SUN3_SCSI_VME 1544 dregs->csr |= CSR_INTR; 1545#endif 1546 initialize_SCp(cmd); 1547 1548 1549 return 0; 1550} 1551 1552 1553/* 1554 * Note : this code is not as quick as it could be, however it 1555 * IS 100% reliable, and for the actual data transfer where speed 1556 * counts, we will always do a pseudo DMA or DMA transfer. 1557 */ 1558 1559static int NCR5380_transfer_pio( struct Scsi_Host *instance, 1560 unsigned char *phase, int *count, 1561 unsigned char **data) 1562{ 1563 register unsigned char p = *phase, tmp; 1564 register int c = *count; 1565 register unsigned char *d = *data; 1566 1567 /* 1568 * The NCR5380 chip will only drive the SCSI bus when the 1569 * phase specified in the appropriate bits of the TARGET COMMAND 1570 * REGISTER match the STATUS REGISTER 1571 */ 1572 1573 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1574 1575 do { 1576 /* 1577 * Wait for assertion of REQ, after which the phase bits will be 1578 * valid 1579 */ 1580 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)); 1581 1582 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO); 1583 1584 /* Check for phase mismatch */ 1585 if ((tmp & PHASE_MASK) != p) { 1586 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO); 1587 NCR_PRINT_PHASE(NDEBUG_PIO); 1588 break; 1589 } 1590 1591 /* Do actual transfer from SCSI bus to / from memory */ 1592 if (!(p & SR_IO)) 1593 NCR5380_write(OUTPUT_DATA_REG, *d); 1594 else 1595 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1596 1597 ++d; 1598 1599 /* 1600 * The SCSI standard suggests that in MSGOUT phase, the initiator 1601 * should drop ATN on the last byte of the message phase 1602 * after REQ has been asserted for the handshake but before 1603 * the initiator raises ACK. 1604 */ 1605 1606 if (!(p & SR_IO)) { 1607 if (!((p & SR_MSG) && c > 1)) { 1608 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1609 ICR_ASSERT_DATA); 1610 NCR_PRINT(NDEBUG_PIO); 1611 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1612 ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1613 } else { 1614 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1615 ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1616 NCR_PRINT(NDEBUG_PIO); 1617 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1618 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1619 } 1620 } else { 1621 NCR_PRINT(NDEBUG_PIO); 1622 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1623 } 1624 1625 while (NCR5380_read(STATUS_REG) & SR_REQ); 1626 1627 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO); 1628 1629/* 1630 * We have several special cases to consider during REQ/ACK handshaking : 1631 * 1. We were in MSGOUT phase, and we are on the last byte of the 1632 * message. ATN must be dropped as ACK is dropped. 1633 * 1634 * 2. We are in a MSGIN phase, and we are on the last byte of the 1635 * message. We must exit with ACK asserted, so that the calling 1636 * code may raise ATN before dropping ACK to reject the message. 1637 * 1638 * 3. ACK and ATN are clear and the target may proceed as normal. 1639 */ 1640 if (!(p == PHASE_MSGIN && c == 1)) { 1641 if (p == PHASE_MSGOUT && c > 1) 1642 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1643 else 1644 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1645 } 1646 } while (--c); 1647 1648 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c); 1649 1650 *count = c; 1651 *data = d; 1652 tmp = NCR5380_read(STATUS_REG); 1653 /* The phase read from the bus is valid if either REQ is (already) 1654 * asserted or if ACK hasn't been released yet. The latter is the case if 1655 * we're in MSGIN and all wanted bytes have been received. */ 1656 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) 1657 *phase = tmp & PHASE_MASK; 1658 else 1659 *phase = PHASE_UNKNOWN; 1660 1661 if (!c || (*phase == p)) 1662 return 0; 1663 else 1664 return -1; 1665} 1666 1667/* 1668 * Function : do_abort (Scsi_Host *host) 1669 * 1670 * Purpose : abort the currently established nexus. Should only be 1671 * called from a routine which can drop into a 1672 * 1673 * Returns : 0 on success, -1 on failure. 1674 */ 1675 1676static int do_abort (struct Scsi_Host *host) 1677{ 1678 unsigned char tmp, *msgptr, phase; 1679 int len; 1680 1681 /* Request message out phase */ 1682 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1683 1684 /* 1685 * Wait for the target to indicate a valid phase by asserting 1686 * REQ. Once this happens, we'll have either a MSGOUT phase 1687 * and can immediately send the ABORT message, or we'll have some 1688 * other phase and will have to source/sink data. 1689 * 1690 * We really don't care what value was on the bus or what value 1691 * the target sees, so we just handshake. 1692 */ 1693 1694 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ); 1695 1696 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1697 1698 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1699 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 1700 ICR_ASSERT_ACK); 1701 while (NCR5380_read(STATUS_REG) & SR_REQ); 1702 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1703 } 1704 1705 tmp = ABORT; 1706 msgptr = &tmp; 1707 len = 1; 1708 phase = PHASE_MSGOUT; 1709 NCR5380_transfer_pio (host, &phase, &len, &msgptr); 1710 1711 /* 1712 * If we got here, and the command completed successfully, 1713 * we're about to go into bus free state. 1714 */ 1715 1716 return len ? -1 : 0; 1717} 1718 1719#if defined(REAL_DMA) 1720/* 1721 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1722 * unsigned char *phase, int *count, unsigned char **data) 1723 * 1724 * Purpose : transfers data in given phase using either real 1725 * or pseudo DMA. 1726 * 1727 * Inputs : instance - instance of driver, *phase - pointer to 1728 * what phase is expected, *count - pointer to number of 1729 * bytes to transfer, **data - pointer to data pointer. 1730 * 1731 * Returns : -1 when different phase is entered without transferring 1732 * maximum number of bytes, 0 if all bytes or transfered or exit 1733 * is in same phase. 1734 * 1735 * Also, *phase, *count, *data are modified in place. 1736 * 1737 */ 1738 1739 1740static int NCR5380_transfer_dma( struct Scsi_Host *instance, 1741 unsigned char *phase, int *count, 1742 unsigned char **data) 1743{ 1744 SETUP_HOSTDATA(instance); 1745 register int c = *count; 1746 register unsigned char p = *phase; 1747 unsigned long flags; 1748 1749 /* sanity check */ 1750 if(!sun3_dma_setup_done) { 1751 printk("scsi%d: transfer_dma without setup!\n", HOSTNO); 1752 BUG(); 1753 } 1754 hostdata->dma_len = c; 1755 1756 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n", 1757 HOSTNO, (p & SR_IO) ? "reading" : "writing", 1758 c, (p & SR_IO) ? "to" : "from", *data); 1759 1760 /* netbsd turns off ints here, why not be safe and do it too */ 1761 local_irq_save(flags); 1762 1763 /* send start chain */ 1764 sun3scsi_dma_start(c, *data); 1765 1766 if (p & SR_IO) { 1767 NCR5380_write(TARGET_COMMAND_REG, 1); 1768 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1769 NCR5380_write(INITIATOR_COMMAND_REG, 0); 1770 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); 1771 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 1772 } else { 1773 NCR5380_write(TARGET_COMMAND_REG, 0); 1774 NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1775 NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); 1776 NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); 1777 NCR5380_write(START_DMA_SEND_REG, 0); 1778 } 1779 1780#ifdef SUN3_SCSI_VME 1781 dregs->csr |= CSR_DMA_ENABLE; 1782#endif 1783 1784 local_irq_restore(flags); 1785 1786 sun3_dma_active = 1; 1787 return 0; 1788} 1789#endif /* defined(REAL_DMA) */ 1790 1791 1792static void NCR5380_information_transfer (struct Scsi_Host *instance) 1793{ 1794 SETUP_HOSTDATA(instance); 1795 unsigned long flags; 1796 unsigned char msgout = NOP; 1797 int sink = 0; 1798 int len; 1799#if defined(REAL_DMA) 1800 int transfersize; 1801#endif 1802 unsigned char *data; 1803 unsigned char phase, tmp, extended_msg[10], old_phase=0xff; 1804 struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected; 1805 1806#ifdef SUN3_SCSI_VME 1807 dregs->csr |= CSR_INTR; 1808#endif 1809 1810 while (1) { 1811 tmp = NCR5380_read(STATUS_REG); 1812 /* We only have a valid SCSI phase when REQ is asserted */ 1813 if (tmp & SR_REQ) { 1814 phase = (tmp & PHASE_MASK); 1815 if (phase != old_phase) { 1816 old_phase = phase; 1817 NCR_PRINT_PHASE(NDEBUG_INFORMATION); 1818 } 1819 1820 if(phase == PHASE_CMDOUT) { 1821 void *d; 1822 unsigned long count; 1823 1824 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 1825 count = cmd->SCp.buffer->length; 1826 d = SGADDR(cmd->SCp.buffer); 1827 } else { 1828 count = cmd->SCp.this_residual; 1829 d = cmd->SCp.ptr; 1830 } 1831#ifdef REAL_DMA 1832 /* this command setup for dma yet? */ 1833 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done 1834 != cmd)) 1835 { 1836 if(blk_fs_request(cmd->request)) { 1837 sun3scsi_dma_setup(d, count, 1838 rq_data_dir(cmd->request)); 1839 sun3_dma_setup_done = cmd; 1840 } 1841 } 1842#endif 1843#ifdef SUN3_SCSI_VME 1844 dregs->csr |= CSR_INTR; 1845#endif 1846 } 1847 1848 1849 if (sink && (phase != PHASE_MSGOUT)) { 1850 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1851 1852 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 1853 ICR_ASSERT_ACK); 1854 while (NCR5380_read(STATUS_REG) & SR_REQ); 1855 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1856 ICR_ASSERT_ATN); 1857 sink = 0; 1858 continue; 1859 } 1860 1861 switch (phase) { 1862 case PHASE_DATAOUT: 1863#if (NDEBUG & NDEBUG_NO_DATAOUT) 1864 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " 1865 "aborted\n", HOSTNO); 1866 sink = 1; 1867 do_abort(instance); 1868 cmd->result = DID_ERROR << 16; 1869 cmd->done(cmd); 1870 return; 1871#endif 1872 case PHASE_DATAIN: 1873 /* 1874 * If there is no room left in the current buffer in the 1875 * scatter-gather list, move onto the next one. 1876 */ 1877 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 1878 ++cmd->SCp.buffer; 1879 --cmd->SCp.buffers_residual; 1880 cmd->SCp.this_residual = cmd->SCp.buffer->length; 1881 cmd->SCp.ptr = SGADDR(cmd->SCp.buffer); 1882 1883 /* ++roman: Try to merge some scatter-buffers if 1884 * they are at contiguous physical addresses. 1885 */ 1886// merge_contiguous_buffers( cmd ); 1887 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n", 1888 HOSTNO, cmd->SCp.this_residual, 1889 cmd->SCp.buffers_residual); 1890 } 1891 1892 /* 1893 * The preferred transfer method is going to be 1894 * PSEUDO-DMA for systems that are strictly PIO, 1895 * since we can let the hardware do the handshaking. 1896 * 1897 * For this to work, we need to know the transfersize 1898 * ahead of time, since the pseudo-DMA code will sit 1899 * in an unconditional loop. 1900 */ 1901 1902/* ++roman: I suggest, this should be 1903 * #if def(REAL_DMA) 1904 * instead of leaving REAL_DMA out. 1905 */ 1906 1907#if defined(REAL_DMA) 1908// if (!cmd->device->borken && 1909 if((transfersize = 1910 NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) { 1911 len = transfersize; 1912 cmd->SCp.phase = phase; 1913 1914 if (NCR5380_transfer_dma(instance, &phase, 1915 &len, (unsigned char **) &cmd->SCp.ptr)) { 1916 /* 1917 * If the watchdog timer fires, all future 1918 * accesses to this device will use the 1919 * polled-IO. */ 1920 printk(KERN_NOTICE "scsi%d: switching target %d " 1921 "lun %d to slow handshake\n", HOSTNO, 1922 cmd->device->id, cmd->device->lun); 1923 cmd->device->borken = 1; 1924 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1925 ICR_ASSERT_ATN); 1926 sink = 1; 1927 do_abort(instance); 1928 cmd->result = DID_ERROR << 16; 1929 cmd->done(cmd); 1930 } else { 1931#ifdef REAL_DMA 1932 /* ++roman: When using real DMA, 1933 * information_transfer() should return after 1934 * starting DMA since it has nothing more to 1935 * do. 1936 */ 1937 return; 1938#else 1939 cmd->SCp.this_residual -= transfersize - len; 1940#endif 1941 } 1942 } else 1943#endif /* defined(REAL_DMA) */ 1944 NCR5380_transfer_pio(instance, &phase, 1945 (int *) &cmd->SCp.this_residual, (unsigned char **) 1946 &cmd->SCp.ptr); 1947#ifdef REAL_DMA 1948 /* if we had intended to dma that command clear it */ 1949 if(sun3_dma_setup_done == cmd) 1950 sun3_dma_setup_done = NULL; 1951#endif 1952 1953 break; 1954 case PHASE_MSGIN: 1955 len = 1; 1956 data = &tmp; 1957 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ 1958 NCR5380_transfer_pio(instance, &phase, &len, &data); 1959 cmd->SCp.Message = tmp; 1960 1961 switch (tmp) { 1962 /* 1963 * Linking lets us reduce the time required to get the 1964 * next command out to the device, hopefully this will 1965 * mean we don't waste another revolution due to the delays 1966 * required by ARBITRATION and another SELECTION. 1967 * 1968 * In the current implementation proposal, low level drivers 1969 * merely have to start the next command, pointed to by 1970 * next_link, done() is called as with unlinked commands. 1971 */ 1972#ifdef LINKED 1973 case LINKED_CMD_COMPLETE: 1974 case LINKED_FLG_CMD_COMPLETE: 1975 /* Accept message by clearing ACK */ 1976 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1977 1978 LNK_PRINTK("scsi%d: target %d lun %d linked command " 1979 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); 1980 1981 /* Enable reselect interrupts */ 1982 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1983 /* 1984 * Sanity check : A linked command should only terminate 1985 * with one of these messages if there are more linked 1986 * commands available. 1987 */ 1988 1989 if (!cmd->next_link) { 1990 printk(KERN_NOTICE "scsi%d: target %d lun %d " 1991 "linked command complete, no next_link\n", 1992 HOSTNO, cmd->device->id, cmd->device->lun); 1993 sink = 1; 1994 do_abort (instance); 1995 return; 1996 } 1997 1998 initialize_SCp(cmd->next_link); 1999 /* The next command is still part of this process; copy it 2000 * and don't free it! */ 2001 cmd->next_link->tag = cmd->tag; 2002 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2003 LNK_PRINTK("scsi%d: target %d lun %d linked request " 2004 "done, calling scsi_done().\n", 2005 HOSTNO, cmd->device->id, cmd->device->lun); 2006#ifdef NCR5380_STATS 2007 collect_stats(hostdata, cmd); 2008#endif 2009 cmd->scsi_done(cmd); 2010 cmd = hostdata->connected; 2011 break; 2012#endif /* def LINKED */ 2013 case ABORT: 2014 case COMMAND_COMPLETE: 2015 /* Accept message by clearing ACK */ 2016 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2017 hostdata->connected = NULL; 2018 QU_PRINTK("scsi%d: command for target %d, lun %d " 2019 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); 2020#ifdef SUPPORT_TAGS 2021 cmd_free_tag( cmd ); 2022 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { 2023 /* Turn a QUEUE FULL status into BUSY, I think the 2024 * mid level cannot handle QUEUE FULL :-( (The 2025 * command is retried after BUSY). Also update our 2026 * queue size to the number of currently issued 2027 * commands now. 2028 */ 2029 /* ++Andreas: the mid level code knows about 2030 QUEUE_FULL now. */ 2031 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; 2032 TAG_PRINTK("scsi%d: target %d lun %d returned " 2033 "QUEUE_FULL after %d commands\n", 2034 HOSTNO, cmd->device->id, cmd->device->lun, 2035 ta->nr_allocated); 2036 if (ta->queue_size > ta->nr_allocated) 2037 ta->nr_allocated = ta->queue_size; 2038 } 2039#else 2040 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2041#endif 2042 /* Enable reselect interrupts */ 2043 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2044 2045 /* 2046 * I'm not sure what the correct thing to do here is : 2047 * 2048 * If the command that just executed is NOT a request 2049 * sense, the obvious thing to do is to set the result 2050 * code to the values of the stored parameters. 2051 * 2052 * If it was a REQUEST SENSE command, we need some way to 2053 * differentiate between the failure code of the original 2054 * and the failure code of the REQUEST sense - the obvious 2055 * case is success, where we fall through and leave the 2056 * result code unchanged. 2057 * 2058 * The non-obvious place is where the REQUEST SENSE failed 2059 */ 2060 2061 if (cmd->cmnd[0] != REQUEST_SENSE) 2062 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2063 else if (status_byte(cmd->SCp.Status) != GOOD) 2064 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2065 2066#ifdef AUTOSENSE 2067 if ((cmd->cmnd[0] != REQUEST_SENSE) && 2068 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2069 ASEN_PRINTK("scsi%d: performing request sense\n", 2070 HOSTNO); 2071 cmd->cmnd[0] = REQUEST_SENSE; 2072 cmd->cmnd[1] &= 0xe0; 2073 cmd->cmnd[2] = 0; 2074 cmd->cmnd[3] = 0; 2075 cmd->cmnd[4] = sizeof(cmd->sense_buffer); 2076 cmd->cmnd[5] = 0; 2077 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]); 2078 2079 cmd->use_sg = 0; 2080 /* this is initialized from initialize_SCp 2081 cmd->SCp.buffer = NULL; 2082 cmd->SCp.buffers_residual = 0; 2083 */ 2084 cmd->request_buffer = (char *) cmd->sense_buffer; 2085 cmd->request_bufflen = sizeof(cmd->sense_buffer); 2086 2087 local_irq_save(flags); 2088 LIST(cmd,hostdata->issue_queue); 2089 NEXT(cmd) = hostdata->issue_queue; 2090 hostdata->issue_queue = (struct scsi_cmnd *) cmd; 2091 local_irq_restore(flags); 2092 QU_PRINTK("scsi%d: REQUEST SENSE added to head of " 2093 "issue queue\n", H_NO(cmd)); 2094 } else 2095#endif /* def AUTOSENSE */ 2096 { 2097#ifdef NCR5380_STATS 2098 collect_stats(hostdata, cmd); 2099#endif 2100 cmd->scsi_done(cmd); 2101 } 2102 2103 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2104 /* 2105 * Restore phase bits to 0 so an interrupted selection, 2106 * arbitration can resume. 2107 */ 2108 NCR5380_write(TARGET_COMMAND_REG, 0); 2109 2110 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2111 barrier(); 2112 2113 return; 2114 case MESSAGE_REJECT: 2115 /* Accept message by clearing ACK */ 2116 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2117 /* Enable reselect interrupts */ 2118 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2119 switch (hostdata->last_message) { 2120 case HEAD_OF_QUEUE_TAG: 2121 case ORDERED_QUEUE_TAG: 2122 case SIMPLE_QUEUE_TAG: 2123 /* The target obviously doesn't support tagged 2124 * queuing, even though it announced this ability in 2125 * its INQUIRY data ?!? (maybe only this LUN?) Ok, 2126 * clear 'tagged_supported' and lock the LUN, since 2127 * the command is treated as untagged further on. 2128 */ 2129 cmd->device->tagged_supported = 0; 2130 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2131 cmd->tag = TAG_NONE; 2132 TAG_PRINTK("scsi%d: target %d lun %d rejected " 2133 "QUEUE_TAG message; tagged queuing " 2134 "disabled\n", 2135 HOSTNO, cmd->device->id, cmd->device->lun); 2136 break; 2137 } 2138 break; 2139 case DISCONNECT: 2140 /* Accept message by clearing ACK */ 2141 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2142 local_irq_save(flags); 2143 cmd->device->disconnect = 1; 2144 LIST(cmd,hostdata->disconnected_queue); 2145 NEXT(cmd) = hostdata->disconnected_queue; 2146 hostdata->connected = NULL; 2147 hostdata->disconnected_queue = cmd; 2148 local_irq_restore(flags); 2149 QU_PRINTK("scsi%d: command for target %d lun %d was " 2150 "moved from connected to the " 2151 "disconnected_queue\n", HOSTNO, 2152 cmd->device->id, cmd->device->lun); 2153 /* 2154 * Restore phase bits to 0 so an interrupted selection, 2155 * arbitration can resume. 2156 */ 2157 NCR5380_write(TARGET_COMMAND_REG, 0); 2158 2159 /* Enable reselect interrupts */ 2160 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2161 /* Wait for bus free to avoid nasty timeouts */ 2162 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2163 barrier(); 2164#ifdef SUN3_SCSI_VME 2165 dregs->csr |= CSR_DMA_ENABLE; 2166#endif 2167 return; 2168 /* 2169 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2170 * operation, in violation of the SCSI spec so we can safely 2171 * ignore SAVE/RESTORE pointers calls. 2172 * 2173 * Unfortunately, some disks violate the SCSI spec and 2174 * don't issue the required SAVE_POINTERS message before 2175 * disconnecting, and we have to break spec to remain 2176 * compatible. 2177 */ 2178 case SAVE_POINTERS: 2179 case RESTORE_POINTERS: 2180 /* Accept message by clearing ACK */ 2181 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2182 /* Enable reselect interrupts */ 2183 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2184 break; 2185 case EXTENDED_MESSAGE: 2186/* 2187 * Extended messages are sent in the following format : 2188 * Byte 2189 * 0 EXTENDED_MESSAGE == 1 2190 * 1 length (includes one byte for code, doesn't 2191 * include first two bytes) 2192 * 2 code 2193 * 3..length+1 arguments 2194 * 2195 * Start the extended message buffer with the EXTENDED_MESSAGE 2196 * byte, since spi_print_msg() wants the whole thing. 2197 */ 2198 extended_msg[0] = EXTENDED_MESSAGE; 2199 /* Accept first byte by clearing ACK */ 2200 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2201 2202 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO); 2203 2204 len = 2; 2205 data = extended_msg + 1; 2206 phase = PHASE_MSGIN; 2207 NCR5380_transfer_pio(instance, &phase, &len, &data); 2208 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO, 2209 (int)extended_msg[1], (int)extended_msg[2]); 2210 2211 if (!len && extended_msg[1] <= 2212 (sizeof (extended_msg) - 1)) { 2213 /* Accept third byte by clearing ACK */ 2214 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2215 len = extended_msg[1] - 1; 2216 data = extended_msg + 3; 2217 phase = PHASE_MSGIN; 2218 2219 NCR5380_transfer_pio(instance, &phase, &len, &data); 2220 EXT_PRINTK("scsi%d: message received, residual %d\n", 2221 HOSTNO, len); 2222 2223 switch (extended_msg[2]) { 2224 case EXTENDED_SDTR: 2225 case EXTENDED_WDTR: 2226 case EXTENDED_MODIFY_DATA_POINTER: 2227 case EXTENDED_EXTENDED_IDENTIFY: 2228 tmp = 0; 2229 } 2230 } else if (len) { 2231 printk(KERN_NOTICE "scsi%d: error receiving " 2232 "extended message\n", HOSTNO); 2233 tmp = 0; 2234 } else { 2235 printk(KERN_NOTICE "scsi%d: extended message " 2236 "code %02x length %d is too long\n", 2237 HOSTNO, extended_msg[2], extended_msg[1]); 2238 tmp = 0; 2239 } 2240 /* Fall through to reject message */ 2241 2242 /* 2243 * If we get something weird that we aren't expecting, 2244 * reject it. 2245 */ 2246 default: 2247 if (!tmp) { 2248 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); 2249 spi_print_msg(extended_msg); 2250 printk("\n"); 2251 } else if (tmp != EXTENDED_MESSAGE) 2252 printk(KERN_DEBUG "scsi%d: rejecting unknown " 2253 "message %02x from target %d, lun %d\n", 2254 HOSTNO, tmp, cmd->device->id, cmd->device->lun); 2255 else 2256 printk(KERN_DEBUG "scsi%d: rejecting unknown " 2257 "extended message " 2258 "code %02x, length %d from target %d, lun %d\n", 2259 HOSTNO, extended_msg[1], extended_msg[0], 2260 cmd->device->id, cmd->device->lun); 2261 2262 2263 msgout = MESSAGE_REJECT; 2264 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 2265 ICR_ASSERT_ATN); 2266 break; 2267 } /* switch (tmp) */ 2268 break; 2269 case PHASE_MSGOUT: 2270 len = 1; 2271 data = &msgout; 2272 hostdata->last_message = msgout; 2273 NCR5380_transfer_pio(instance, &phase, &len, &data); 2274 if (msgout == ABORT) { 2275#ifdef SUPPORT_TAGS 2276 cmd_free_tag( cmd ); 2277#else 2278 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2279#endif 2280 hostdata->connected = NULL; 2281 cmd->result = DID_ERROR << 16; 2282#ifdef NCR5380_STATS 2283 collect_stats(hostdata, cmd); 2284#endif 2285 cmd->scsi_done(cmd); 2286 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2287 return; 2288 } 2289 msgout = NOP; 2290 break; 2291 case PHASE_CMDOUT: 2292 len = cmd->cmd_len; 2293 data = cmd->cmnd; 2294 NCR5380_transfer_pio(instance, &phase, &len, 2295 &data); 2296 break; 2297 case PHASE_STATIN: 2298 len = 1; 2299 data = &tmp; 2300 NCR5380_transfer_pio(instance, &phase, &len, &data); 2301 cmd->SCp.Status = tmp; 2302 break; 2303 default: 2304 printk("scsi%d: unknown phase\n", HOSTNO); 2305 NCR_PRINT(NDEBUG_ANY); 2306 } /* switch(phase) */ 2307 } /* if (tmp * SR_REQ) */ 2308 } /* while (1) */ 2309} 2310 2311/* 2312 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2313 * 2314 * Purpose : does reselection, initializing the instance->connected 2315 * field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q 2316 * nexus has been reestablished, 2317 * 2318 * Inputs : instance - this instance of the NCR5380. 2319 * 2320 */ 2321 2322/* it might eventually prove necessary to do a dma setup on 2323 reselection, but it doesn't seem to be needed now -- sam */ 2324 2325static void NCR5380_reselect (struct Scsi_Host *instance) 2326{ 2327 SETUP_HOSTDATA(instance); 2328 unsigned char target_mask; 2329 unsigned char lun; 2330#ifdef SUPPORT_TAGS 2331 unsigned char tag; 2332#endif 2333 unsigned char msg[3]; 2334 struct scsi_cmnd *tmp = NULL, *prev; 2335/* unsigned long flags; */ 2336 2337 /* 2338 * Disable arbitration, etc. since the host adapter obviously 2339 * lost, and tell an interrupted NCR5380_select() to restart. 2340 */ 2341 2342 NCR5380_write(MODE_REG, MR_BASE); 2343 hostdata->restart_select = 1; 2344 2345 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2346 2347 RSL_PRINTK("scsi%d: reselect\n", HOSTNO); 2348 2349 /* 2350 * At this point, we have detected that our SCSI ID is on the bus, 2351 * SEL is true and BSY was false for at least one bus settle delay 2352 * (400 ns). 2353 * 2354 * We must assert BSY ourselves, until the target drops the SEL 2355 * signal. 2356 */ 2357 2358 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2359 2360 while (NCR5380_read(STATUS_REG) & SR_SEL); 2361 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2362 2363 /* 2364 * Wait for target to go into MSGIN. 2365 */ 2366 2367 while (!(NCR5380_read(STATUS_REG) & SR_REQ)); 2368 2369 // acknowledge toggle to MSGIN 2370 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); 2371 2372 // peek at the byte without really hitting the bus 2373 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); 2374 2375 if (!(msg[0] & 0x80)) { 2376 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); 2377 spi_print_msg(msg); 2378 do_abort(instance); 2379 return; 2380 } 2381 lun = (msg[0] & 0x07); 2382 2383 /* 2384 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2385 * just reestablished, and remove it from the disconnected queue. 2386 */ 2387 2388 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL; 2389 tmp; prev = tmp, tmp = NEXT(tmp) ) { 2390 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2391#ifdef SUPPORT_TAGS 2392 && (tag == tmp->tag) 2393#endif 2394 ) { 2395 if (prev) { 2396 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); 2397 NEXT(prev) = NEXT(tmp); 2398 } else { 2399 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); 2400 hostdata->disconnected_queue = NEXT(tmp); 2401 } 2402 NEXT(tmp) = NULL; 2403 break; 2404 } 2405 } 2406 2407 if (!tmp) { 2408 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " 2409#ifdef SUPPORT_TAGS 2410 "tag %d " 2411#endif 2412 "not in disconnected_queue.\n", 2413 HOSTNO, target_mask, lun 2414#ifdef SUPPORT_TAGS 2415 , tag 2416#endif 2417 ); 2418 /* 2419 * Since we have an established nexus that we can't do anything 2420 * with, we must abort it. 2421 */ 2422 do_abort(instance); 2423 return; 2424 } 2425 /* engage dma setup for the command we just saw */ 2426 { 2427 void *d; 2428 unsigned long count; 2429 2430 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { 2431 count = tmp->SCp.buffer->length; 2432 d = SGADDR(tmp->SCp.buffer); 2433 } else { 2434 count = tmp->SCp.this_residual; 2435 d = tmp->SCp.ptr; 2436 } 2437#ifdef REAL_DMA 2438 /* setup this command for dma if not already */ 2439 if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp)) 2440 { 2441 sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); 2442 sun3_dma_setup_done = tmp; 2443 } 2444#endif 2445 } 2446 2447 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 2448 /* Accept message by clearing ACK */ 2449 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2450 2451#ifdef SUPPORT_TAGS 2452 /* If the phase is still MSGIN, the target wants to send some more 2453 * messages. In case it supports tagged queuing, this is probably a 2454 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. 2455 */ 2456 tag = TAG_NONE; 2457 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { 2458 /* Accept previous IDENTIFY message by clearing ACK */ 2459 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); 2460 len = 2; 2461 data = msg+1; 2462 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && 2463 msg[1] == SIMPLE_QUEUE_TAG) 2464 tag = msg[2]; 2465 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at " 2466 "reselection\n", HOSTNO, target_mask, lun, tag); 2467 } 2468#endif 2469 2470 hostdata->connected = tmp; 2471 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", 2472 HOSTNO, tmp->target, tmp->lun, tmp->tag); 2473} 2474 2475 2476 2477static int NCR5380_abort(struct scsi_cmnd *cmd) 2478{ 2479 struct Scsi_Host *instance = cmd->device->host; 2480 SETUP_HOSTDATA(instance); 2481 struct scsi_cmnd *tmp, **prev; 2482 unsigned long flags; 2483 2484 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); 2485 scsi_print_command(cmd); 2486 2487 NCR5380_print_status (instance); 2488 2489 local_irq_save(flags); 2490 2491 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, 2492 NCR5380_read(BUS_AND_STATUS_REG), 2493 NCR5380_read(STATUS_REG)); 2494 2495/* 2496 * Case 1 : If the command is the currently executing command, 2497 * we'll set the aborted flag and return control so that 2498 * information transfer routine can exit cleanly. 2499 */ 2500 2501 if (hostdata->connected == cmd) { 2502 2503 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO); 2504/* 2505 * We should perform BSY checking, and make sure we haven't slipped 2506 * into BUS FREE. 2507 */ 2508 2509/* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ 2510/* 2511 * Since we can't change phases until we've completed the current 2512 * handshake, we have to source or sink a byte of data if the current 2513 * phase is not MSGOUT. 2514 */ 2515 2516/* 2517 * Return control to the executing NCR drive so we can clear the 2518 * aborted flag and get back into our main loop. 2519 */ 2520 2521 if (do_abort(instance) == 0) { 2522 hostdata->aborted = 1; 2523 hostdata->connected = NULL; 2524 cmd->result = DID_ABORT << 16; 2525#ifdef SUPPORT_TAGS 2526 cmd_free_tag( cmd ); 2527#else 2528 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2529#endif 2530 local_irq_restore(flags); 2531 cmd->scsi_done(cmd); 2532 return SCSI_ABORT_SUCCESS; 2533 } else { 2534/* local_irq_restore(flags); */ 2535 printk("scsi%d: abort of connected command failed!\n", HOSTNO); 2536 return SCSI_ABORT_ERROR; 2537 } 2538 } 2539 2540/* 2541 * Case 2 : If the command hasn't been issued yet, we simply remove it 2542 * from the issue queue. 2543 */ 2544 for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue), 2545 tmp = (struct scsi_cmnd *) hostdata->issue_queue; 2546 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) 2547 if (cmd == tmp) { 2548 REMOVE(5, *prev, tmp, NEXT(tmp)); 2549 (*prev) = NEXT(tmp); 2550 NEXT(tmp) = NULL; 2551 tmp->result = DID_ABORT << 16; 2552 local_irq_restore(flags); 2553 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n", 2554 HOSTNO); 2555 /* Tagged queuing note: no tag to free here, hasn't been assigned 2556 * yet... */ 2557 tmp->scsi_done(tmp); 2558 return SCSI_ABORT_SUCCESS; 2559 } 2560 2561/* 2562 * Case 3 : If any commands are connected, we're going to fail the abort 2563 * and let the high level SCSI driver retry at a later time or 2564 * issue a reset. 2565 * 2566 * Timeouts, and therefore aborted commands, will be highly unlikely 2567 * and handling them cleanly in this situation would make the common 2568 * case of noresets less efficient, and would pollute our code. So, 2569 * we fail. 2570 */ 2571 2572 if (hostdata->connected) { 2573 local_irq_restore(flags); 2574 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO); 2575 return SCSI_ABORT_SNOOZE; 2576 } 2577 2578/* 2579 * Case 4: If the command is currently disconnected from the bus, and 2580 * there are no connected commands, we reconnect the I_T_L or 2581 * I_T_L_Q nexus associated with it, go into message out, and send 2582 * an abort message. 2583 * 2584 * This case is especially ugly. In order to reestablish the nexus, we 2585 * need to call NCR5380_select(). The easiest way to implement this 2586 * function was to abort if the bus was busy, and let the interrupt 2587 * handler triggered on the SEL for reselect take care of lost arbitrations 2588 * where necessary, meaning interrupts need to be enabled. 2589 * 2590 * When interrupts are enabled, the queues may change - so we 2591 * can't remove it from the disconnected queue before selecting it 2592 * because that could cause a failure in hashing the nexus if that 2593 * device reselected. 2594 * 2595 * Since the queues may change, we can't use the pointers from when we 2596 * first locate it. 2597 * 2598 * So, we must first locate the command, and if NCR5380_select() 2599 * succeeds, then issue the abort, relocate the command and remove 2600 * it from the disconnected queue. 2601 */ 2602 2603 for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp; 2604 tmp = NEXT(tmp)) 2605 if (cmd == tmp) { 2606 local_irq_restore(flags); 2607 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO); 2608 2609 if (NCR5380_select (instance, cmd, (int) cmd->tag)) 2610 return SCSI_ABORT_BUSY; 2611 2612 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO); 2613 2614 do_abort (instance); 2615 2616 local_irq_save(flags); 2617 for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue), 2618 tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; 2619 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) ) 2620 if (cmd == tmp) { 2621 REMOVE(5, *prev, tmp, NEXT(tmp)); 2622 *prev = NEXT(tmp); 2623 NEXT(tmp) = NULL; 2624 tmp->result = DID_ABORT << 16; 2625 /* We must unlock the tag/LUN immediately here, since the 2626 * target goes to BUS FREE and doesn't send us another 2627 * message (COMMAND_COMPLETE or the like) 2628 */ 2629#ifdef SUPPORT_TAGS 2630 cmd_free_tag( tmp ); 2631#else 2632 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2633#endif 2634 local_irq_restore(flags); 2635 tmp->scsi_done(tmp); 2636 return SCSI_ABORT_SUCCESS; 2637 } 2638 } 2639 2640/* 2641 * Case 5 : If we reached this point, the command was not found in any of 2642 * the queues. 2643 * 2644 * We probably reached this point because of an unlikely race condition 2645 * between the command completing successfully and the abortion code, 2646 * so we won't panic, but we will notify the user in case something really 2647 * broke. 2648 */ 2649 2650 local_irq_restore(flags); 2651 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n" 2652 KERN_INFO " before abortion\n", HOSTNO); 2653 2654 return SCSI_ABORT_NOT_RUNNING; 2655} 2656 2657 2658/* 2659 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd) 2660 * 2661 * Purpose : reset the SCSI bus. 2662 * 2663 * Returns : SCSI_RESET_WAKEUP 2664 * 2665 */ 2666 2667static int NCR5380_bus_reset(struct scsi_cmnd *cmd) 2668{ 2669 SETUP_HOSTDATA(cmd->device->host); 2670 int i; 2671 unsigned long flags; 2672 struct scsi_cmnd *connected, *disconnected_queue; 2673 2674 2675 NCR5380_print_status (cmd->device->host); 2676 2677 /* get in phase */ 2678 NCR5380_write( TARGET_COMMAND_REG, 2679 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); 2680 /* assert RST */ 2681 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); 2682 udelay (40); 2683 /* reset NCR registers */ 2684 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); 2685 NCR5380_write( MODE_REG, MR_BASE ); 2686 NCR5380_write( TARGET_COMMAND_REG, 0 ); 2687 NCR5380_write( SELECT_ENABLE_REG, 0 ); 2688 /* ++roman: reset interrupt condition! otherwise no interrupts don't get 2689 * through anymore ... */ 2690 (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG ); 2691 2692 2693 /* MSch: old-style reset: actually abort all command processing here */ 2694 2695 /* After the reset, there are no more connected or disconnected commands 2696 * and no busy units; to avoid problems with re-inserting the commands 2697 * into the issue_queue (via scsi_done()), the aborted commands are 2698 * remembered in local variables first. 2699 */ 2700 local_irq_save(flags); 2701 connected = (struct scsi_cmnd *)hostdata->connected; 2702 hostdata->connected = NULL; 2703 disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue; 2704 hostdata->disconnected_queue = NULL; 2705#ifdef SUPPORT_TAGS 2706 free_all_tags(); 2707#endif 2708 for( i = 0; i < 8; ++i ) 2709 hostdata->busy[i] = 0; 2710#ifdef REAL_DMA 2711 hostdata->dma_len = 0; 2712#endif 2713 local_irq_restore(flags); 2714 2715 /* In order to tell the mid-level code which commands were aborted, 2716 * set the command status to DID_RESET and call scsi_done() !!! 2717 * This ultimately aborts processing of these commands in the mid-level. 2718 */ 2719 2720 if ((cmd = connected)) { 2721 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); 2722 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); 2723 cmd->scsi_done( cmd ); 2724 } 2725 2726 for (i = 0; (cmd = disconnected_queue); ++i) { 2727 disconnected_queue = NEXT(cmd); 2728 NEXT(cmd) = NULL; 2729 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); 2730 cmd->scsi_done( cmd ); 2731 } 2732 if (i > 0) 2733 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i); 2734 2735 2736 /* since all commands have been explicitly terminated, we need to tell 2737 * the midlevel code that the reset was SUCCESSFUL, and there is no 2738 * need to 'wake up' the commands by a request_sense 2739 */ 2740 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET; 2741} 2742 2743/* Local Variables: */ 2744/* tab-width: 8 */ 2745/* End: */ 2746