atari_NCR5380.c revision c28bda25175913c88396b643813321ef9cffe663
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 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in 31 * this file, too: 32 * 33 * - Some of the debug statements were incorrect (undefined variables and the 34 * like). I fixed that. 35 * 36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the 37 * possible DMA transfer size should also happen for REAL_DMA. I added this 38 * in the #if statement. 39 * 40 * - When using real DMA, information_transfer() should return in a DATAOUT 41 * phase after starting the DMA. It has nothing more to do. 42 * 43 * - The interrupt service routine should run main after end of DMA, too (not 44 * only after RESELECTION interrupts). Additionally, it should _not_ test 45 * for more interrupts after running main, since a DMA process may have 46 * been started and interrupts are turned on now. The new int could happen 47 * inside the execution of NCR5380_intr(), leading to recursive 48 * calls. 49 * 50 * - I've added a function merge_contiguous_buffers() that tries to 51 * merge scatter-gather buffers that are located at contiguous 52 * physical addresses and can be processed with the same DMA setup. 53 * Since most scatter-gather operations work on a page (4K) of 54 * 4 buffers (1K), in more than 90% of all cases three interrupts and 55 * DMA setup actions are saved. 56 * 57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA 58 * and USLEEP, because these were messing up readability and will never be 59 * needed for Atari SCSI. 60 * 61 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' 62 * stuff), and 'main' is executed in a bottom half if awoken by an 63 * interrupt. 64 * 65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." 66 * constructs. In my eyes, this made the source rather unreadable, so I 67 * finally replaced that by the *_PRINTK() macros. 68 * 69 */ 70 71/* 72 * Further development / testing that should be done : 73 * 1. Test linked command handling code after Eric is ready with 74 * the high level code. 75 */ 76#include <scsi/scsi_dbg.h> 77#include <scsi/scsi_transport_spi.h> 78 79#if (NDEBUG & NDEBUG_LISTS) 80#define LIST(x, y) \ 81 do { \ 82 printk("LINE:%d Adding %p to %p\n", \ 83 __LINE__, (void*)(x), (void*)(y)); \ 84 if ((x) == (y)) \ 85 udelay(5); \ 86 } while (0) 87#define REMOVE(w, x, y, z) \ 88 do { \ 89 printk("LINE:%d Removing: %p->%p %p->%p \n", \ 90 __LINE__, (void*)(w), (void*)(x), \ 91 (void*)(y), (void*)(z)); \ 92 if ((x) == (y)) \ 93 udelay(5); \ 94 } while (0) 95#else 96#define LIST(x,y) 97#define REMOVE(w,x,y,z) 98#endif 99 100#ifndef notyet 101#undef LINKED 102#endif 103 104/* 105 * Design 106 * Issues : 107 * 108 * The other Linux SCSI drivers were written when Linux was Intel PC-only, 109 * and specifically for each board rather than each chip. This makes their 110 * adaptation to platforms like the Mac (Some of which use NCR5380's) 111 * more difficult than it has to be. 112 * 113 * Also, many of the SCSI drivers were written before the command queuing 114 * routines were implemented, meaning their implementations of queued 115 * commands were hacked on rather than designed in from the start. 116 * 117 * When I designed the Linux SCSI drivers I figured that 118 * while having two different SCSI boards in a system might be useful 119 * for debugging things, two of the same type wouldn't be used. 120 * Well, I was wrong and a number of users have mailed me about running 121 * multiple high-performance SCSI boards in a server. 122 * 123 * Finally, when I get questions from users, I have no idea what 124 * revision of my driver they are running. 125 * 126 * This driver attempts to address these problems : 127 * This is a generic 5380 driver. To use it on a different platform, 128 * one simply writes appropriate system specific macros (ie, data 129 * transfer - some PC's will use the I/O bus, 68K's must use 130 * memory mapped) and drops this file in their 'C' wrapper. 131 * 132 * As far as command queueing, two queues are maintained for 133 * each 5380 in the system - commands that haven't been issued yet, 134 * and commands that are currently executing. This means that an 135 * unlimited number of commands may be queued, letting 136 * more commands propagate from the higher driver levels giving higher 137 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, 138 * allowing multiple commands to propagate all the way to a SCSI-II device 139 * while a command is already executing. 140 * 141 * To solve the multiple-boards-in-the-same-system problem, 142 * there is a separate instance structure for each instance 143 * of a 5380 in the system. So, multiple NCR5380 drivers will 144 * be able to coexist with appropriate changes to the high level 145 * SCSI code. 146 * 147 * A NCR5380_PUBLIC_REVISION macro is provided, with the release 148 * number (updated for each public release) printed by the 149 * NCR5380_print_options command, which should be called from the 150 * wrapper detect function, so that I know what release of the driver 151 * users are using. 152 * 153 * Issues specific to the NCR5380 : 154 * 155 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 156 * piece of hardware that requires you to sit in a loop polling for 157 * the REQ signal as long as you are connected. Some devices are 158 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 159 * while doing long seek operations. 160 * 161 * The workaround for this is to keep track of devices that have 162 * disconnected. If the device hasn't disconnected, for commands that 163 * should disconnect, we do something like 164 * 165 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } 166 * 167 * Some tweaking of N and M needs to be done. An algorithm based 168 * on "time to data" would give the best results as long as short time 169 * to datas (ie, on the same track) were considered, however these 170 * broken devices are the exception rather than the rule and I'd rather 171 * spend my time optimizing for the normal case. 172 * 173 * Architecture : 174 * 175 * At the heart of the design is a coroutine, NCR5380_main, 176 * which is started when not running by the interrupt handler, 177 * timer, and queue command function. It attempts to establish 178 * I_T_L or I_T_L_Q nexuses by removing the commands from the 179 * issue queue and calling NCR5380_select() if a nexus 180 * is not established. 181 * 182 * Once a nexus is established, the NCR5380_information_transfer() 183 * phase goes through the various phases as instructed by the target. 184 * if the target goes into MSG IN and sends a DISCONNECT message, 185 * the command structure is placed into the per instance disconnected 186 * queue, and NCR5380_main tries to find more work. If USLEEP 187 * was defined, and the target is idle for too long, the system 188 * will try to sleep. 189 * 190 * If a command has disconnected, eventually an interrupt will trigger, 191 * calling NCR5380_intr() which will in turn call NCR5380_reselect 192 * to reestablish a nexus. This will run main if necessary. 193 * 194 * On command termination, the done function will be called as 195 * appropriate. 196 * 197 * SCSI pointers are maintained in the SCp field of SCSI command 198 * structures, being initialized after the command is connected 199 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. 200 * Note that in violation of the standard, an implicit SAVE POINTERS operation 201 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. 202 */ 203 204/* 205 * Using this file : 206 * This file a skeleton Linux SCSI driver for the NCR 5380 series 207 * of chips. To use it, you write an architecture specific functions 208 * and macros and include this file in your driver. 209 * 210 * These macros control options : 211 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically 212 * for commands that return with a CHECK CONDITION status. 213 * 214 * LINKED - if defined, linked commands are supported. 215 * 216 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. 217 * 218 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible 219 * 220 * These macros MUST be defined : 221 * 222 * NCR5380_read(register) - read from the specified register 223 * 224 * NCR5380_write(register, value) - write to the specific register 225 * 226 * Either real DMA *or* pseudo DMA may be implemented 227 * REAL functions : 228 * NCR5380_REAL_DMA should be defined if real DMA is to be used. 229 * Note that the DMA setup functions should return the number of bytes 230 * that they were able to program the controller for. 231 * 232 * Also note that generic i386/PC versions of these macros are 233 * available as NCR5380_i386_dma_write_setup, 234 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. 235 * 236 * NCR5380_dma_write_setup(instance, src, count) - initialize 237 * NCR5380_dma_read_setup(instance, dst, count) - initialize 238 * NCR5380_dma_residual(instance); - residual count 239 * 240 * PSEUDO functions : 241 * NCR5380_pwrite(instance, src, count) 242 * NCR5380_pread(instance, dst, count); 243 * 244 * If nothing specific to this implementation needs doing (ie, with external 245 * hardware), you must also define 246 * 247 * NCR5380_queue_command 248 * NCR5380_reset 249 * NCR5380_abort 250 * NCR5380_proc_info 251 * 252 * to be the global entry points into the specific driver, ie 253 * #define NCR5380_queue_command t128_queue_command. 254 * 255 * If this is not done, the routines will be defined as static functions 256 * with the NCR5380* names and the user must provide a globally 257 * accessible wrapper function. 258 * 259 * The generic driver is initialized by calling NCR5380_init(instance), 260 * after setting the appropriate host specific fields and ID. If the 261 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, 262 * possible) function may be used. Before the specific driver initialization 263 * code finishes, NCR5380_print_options should be called. 264 */ 265 266static struct Scsi_Host *first_instance = NULL; 267static struct scsi_host_template *the_template = NULL; 268 269/* Macros ease life... :-) */ 270#define SETUP_HOSTDATA(in) \ 271 struct NCR5380_hostdata *hostdata = \ 272 (struct NCR5380_hostdata *)(in)->hostdata 273#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) 274 275#define NEXT(cmd) ((cmd)->host_scribble) 276#define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble)) 277 278#define HOSTNO instance->host_no 279#define H_NO(cmd) (cmd)->device->host->host_no 280 281#ifdef SUPPORT_TAGS 282 283/* 284 * Functions for handling tagged queuing 285 * ===================================== 286 * 287 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: 288 * 289 * Using consecutive numbers for the tags is no good idea in my eyes. There 290 * could be wrong re-usings if the counter (8 bit!) wraps and some early 291 * command has been preempted for a long time. My solution: a bitfield for 292 * remembering used tags. 293 * 294 * There's also the problem that each target has a certain queue size, but we 295 * cannot know it in advance :-( We just see a QUEUE_FULL status being 296 * returned. So, in this case, the driver internal queue size assumption is 297 * reduced to the number of active tags if QUEUE_FULL is returned by the 298 * target. The command is returned to the mid-level, but with status changed 299 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL 300 * correctly. 301 * 302 * We're also not allowed running tagged commands as long as an untagged 303 * command is active. And REQUEST SENSE commands after a contingent allegiance 304 * condition _must_ be untagged. To keep track whether an untagged command has 305 * been issued, the host->busy array is still employed, as it is without 306 * support for tagged queuing. 307 * 308 * One could suspect that there are possible race conditions between 309 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the 310 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), 311 * which already guaranteed to be running at most once. It is also the only 312 * place where tags/LUNs are allocated. So no other allocation can slip 313 * between that pair, there could only happen a reselection, which can free a 314 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes 315 * important: the tag bit must be cleared before 'nr_allocated' is decreased. 316 */ 317 318/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ 319#undef TAG_NONE 320#define TAG_NONE 0xff 321 322typedef struct { 323 DECLARE_BITMAP(allocated, MAX_TAGS); 324 int nr_allocated; 325 int queue_size; 326} TAG_ALLOC; 327 328static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ 329 330 331static void __init init_tags(void) 332{ 333 int target, lun; 334 TAG_ALLOC *ta; 335 336 if (!setup_use_tagged_queuing) 337 return; 338 339 for (target = 0; target < 8; ++target) { 340 for (lun = 0; lun < 8; ++lun) { 341 ta = &TagAlloc[target][lun]; 342 bitmap_zero(ta->allocated, MAX_TAGS); 343 ta->nr_allocated = 0; 344 /* At the beginning, assume the maximum queue size we could 345 * support (MAX_TAGS). This value will be decreased if the target 346 * returns QUEUE_FULL status. 347 */ 348 ta->queue_size = MAX_TAGS; 349 } 350 } 351} 352 353 354/* Check if we can issue a command to this LUN: First see if the LUN is marked 355 * busy by an untagged command. If the command should use tagged queuing, also 356 * check that there is a free tag and the target's queue won't overflow. This 357 * function should be called with interrupts disabled to avoid race 358 * conditions. 359 */ 360 361static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged) 362{ 363 SETUP_HOSTDATA(cmd->device->host); 364 365 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) 366 return 1; 367 if (!should_be_tagged || 368 !setup_use_tagged_queuing || !cmd->device->tagged_supported) 369 return 0; 370 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= 371 TagAlloc[cmd->device->id][cmd->device->lun].queue_size) { 372 TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n", 373 H_NO(cmd), cmd->device->id, cmd->device->lun); 374 return 1; 375 } 376 return 0; 377} 378 379 380/* Allocate a tag for a command (there are no checks anymore, check_lun_busy() 381 * must be called before!), or reserve the LUN in 'busy' if the command is 382 * untagged. 383 */ 384 385static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged) 386{ 387 SETUP_HOSTDATA(cmd->device->host); 388 389 /* If we or the target don't support tagged queuing, allocate the LUN for 390 * an untagged command. 391 */ 392 if (!should_be_tagged || 393 !setup_use_tagged_queuing || !cmd->device->tagged_supported) { 394 cmd->tag = TAG_NONE; 395 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 396 TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged " 397 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun); 398 } else { 399 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; 400 401 cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS); 402 set_bit(cmd->tag, ta->allocated); 403 ta->nr_allocated++; 404 TAG_PRINTK("scsi%d: using tag %d for target %d lun %d " 405 "(now %d tags in use)\n", 406 H_NO(cmd), cmd->tag, cmd->device->id, 407 cmd->device->lun, ta->nr_allocated); 408 } 409} 410 411 412/* Mark the tag of command 'cmd' as free, or in case of an untagged command, 413 * unlock the LUN. 414 */ 415 416static void cmd_free_tag(Scsi_Cmnd *cmd) 417{ 418 SETUP_HOSTDATA(cmd->device->host); 419 420 if (cmd->tag == TAG_NONE) { 421 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 422 TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n", 423 H_NO(cmd), cmd->device->id, cmd->device->lun); 424 } else if (cmd->tag >= MAX_TAGS) { 425 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", 426 H_NO(cmd), cmd->tag); 427 } else { 428 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; 429 clear_bit(cmd->tag, ta->allocated); 430 ta->nr_allocated--; 431 TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n", 432 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun); 433 } 434} 435 436 437static void free_all_tags(void) 438{ 439 int target, lun; 440 TAG_ALLOC *ta; 441 442 if (!setup_use_tagged_queuing) 443 return; 444 445 for (target = 0; target < 8; ++target) { 446 for (lun = 0; lun < 8; ++lun) { 447 ta = &TagAlloc[target][lun]; 448 bitmap_zero(ta->allocated, MAX_TAGS); 449 ta->nr_allocated = 0; 450 } 451 } 452} 453 454#endif /* SUPPORT_TAGS */ 455 456 457/* 458 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd ) 459 * 460 * Purpose: Try to merge several scatter-gather requests into one DMA 461 * transfer. This is possible if the scatter buffers lie on 462 * physical contiguous addresses. 463 * 464 * Parameters: Scsi_Cmnd *cmd 465 * The command to work on. The first scatter buffer's data are 466 * assumed to be already transfered into ptr/this_residual. 467 */ 468 469static void merge_contiguous_buffers(Scsi_Cmnd *cmd) 470{ 471 unsigned long endaddr; 472#if (NDEBUG & NDEBUG_MERGING) 473 unsigned long oldlen = cmd->SCp.this_residual; 474 int cnt = 1; 475#endif 476 477 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; 478 cmd->SCp.buffers_residual && 479 virt_to_phys(page_address(cmd->SCp.buffer[1].page) + 480 cmd->SCp.buffer[1].offset) == endaddr;) { 481 MER_PRINTK("VTOP(%p) == %08lx -> merging\n", 482 cmd->SCp.buffer[1].address, endaddr); 483#if (NDEBUG & NDEBUG_MERGING) 484 ++cnt; 485#endif 486 ++cmd->SCp.buffer; 487 --cmd->SCp.buffers_residual; 488 cmd->SCp.this_residual += cmd->SCp.buffer->length; 489 endaddr += cmd->SCp.buffer->length; 490 } 491#if (NDEBUG & NDEBUG_MERGING) 492 if (oldlen != cmd->SCp.this_residual) 493 MER_PRINTK("merged %d buffers from %p, new length %08x\n", 494 cnt, cmd->SCp.ptr, cmd->SCp.this_residual); 495#endif 496} 497 498/* 499 * Function : void initialize_SCp(Scsi_Cmnd *cmd) 500 * 501 * Purpose : initialize the saved data pointers for cmd to point to the 502 * start of the buffer. 503 * 504 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. 505 */ 506 507static inline void initialize_SCp(Scsi_Cmnd *cmd) 508{ 509 /* 510 * Initialize the Scsi Pointer field so that all of the commands in the 511 * various queues are valid. 512 */ 513 514 if (cmd->use_sg) { 515 cmd->SCp.buffer = (struct scatterlist *)cmd->request_buffer; 516 cmd->SCp.buffers_residual = cmd->use_sg - 1; 517 cmd->SCp.ptr = (char *)page_address(cmd->SCp.buffer->page) + 518 cmd->SCp.buffer->offset; 519 cmd->SCp.this_residual = cmd->SCp.buffer->length; 520 /* ++roman: Try to merge some scatter-buffers if they are at 521 * contiguous physical addresses. 522 */ 523 merge_contiguous_buffers(cmd); 524 } else { 525 cmd->SCp.buffer = NULL; 526 cmd->SCp.buffers_residual = 0; 527 cmd->SCp.ptr = (char *)cmd->request_buffer; 528 cmd->SCp.this_residual = cmd->request_bufflen; 529 } 530} 531 532#include <linux/delay.h> 533 534#if NDEBUG 535static struct { 536 unsigned char mask; 537 const char *name; 538} signals[] = { 539 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, 540 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, 541 { SR_SEL, "SEL" }, {0, NULL} 542}, basrs[] = { 543 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL} 544}, icrs[] = { 545 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, 546 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, 547 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, 548 {0, NULL} 549}, mrs[] = { 550 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, 551 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, 552 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, 553 {MR_MONITOR_BSY, "MODE MONITOR BSY"}, 554 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, 555 {0, NULL} 556}; 557 558/* 559 * Function : void NCR5380_print(struct Scsi_Host *instance) 560 * 561 * Purpose : print the SCSI bus signals for debugging purposes 562 * 563 * Input : instance - which NCR5380 564 */ 565 566static void NCR5380_print(struct Scsi_Host *instance) 567{ 568 unsigned char status, data, basr, mr, icr, i; 569 unsigned long flags; 570 571 local_irq_save(flags); 572 data = NCR5380_read(CURRENT_SCSI_DATA_REG); 573 status = NCR5380_read(STATUS_REG); 574 mr = NCR5380_read(MODE_REG); 575 icr = NCR5380_read(INITIATOR_COMMAND_REG); 576 basr = NCR5380_read(BUS_AND_STATUS_REG); 577 local_irq_restore(flags); 578 printk("STATUS_REG: %02x ", status); 579 for (i = 0; signals[i].mask; ++i) 580 if (status & signals[i].mask) 581 printk(",%s", signals[i].name); 582 printk("\nBASR: %02x ", basr); 583 for (i = 0; basrs[i].mask; ++i) 584 if (basr & basrs[i].mask) 585 printk(",%s", basrs[i].name); 586 printk("\nICR: %02x ", icr); 587 for (i = 0; icrs[i].mask; ++i) 588 if (icr & icrs[i].mask) 589 printk(",%s", icrs[i].name); 590 printk("\nMODE: %02x ", mr); 591 for (i = 0; mrs[i].mask; ++i) 592 if (mr & mrs[i].mask) 593 printk(",%s", mrs[i].name); 594 printk("\n"); 595} 596 597static struct { 598 unsigned char value; 599 const char *name; 600} phases[] = { 601 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, 602 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, 603 {PHASE_UNKNOWN, "UNKNOWN"} 604}; 605 606/* 607 * Function : void NCR5380_print_phase(struct Scsi_Host *instance) 608 * 609 * Purpose : print the current SCSI phase for debugging purposes 610 * 611 * Input : instance - which NCR5380 612 */ 613 614static void NCR5380_print_phase(struct Scsi_Host *instance) 615{ 616 unsigned char status; 617 int i; 618 619 status = NCR5380_read(STATUS_REG); 620 if (!(status & SR_REQ)) 621 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); 622 else { 623 for (i = 0; (phases[i].value != PHASE_UNKNOWN) && 624 (phases[i].value != (status & PHASE_MASK)); ++i) 625 ; 626 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); 627 } 628} 629 630#else /* !NDEBUG */ 631 632/* dummies... */ 633static inline void NCR5380_print(struct Scsi_Host *instance) 634{ 635}; 636static inline void NCR5380_print_phase(struct Scsi_Host *instance) 637{ 638}; 639 640#endif 641 642/* 643 * ++roman: New scheme of calling NCR5380_main() 644 * 645 * If we're not in an interrupt, we can call our main directly, it cannot be 646 * already running. Else, we queue it on a task queue, if not 'main_running' 647 * tells us that a lower level is already executing it. This way, 648 * 'main_running' needs not be protected in a special way. 649 * 650 * queue_main() is a utility function for putting our main onto the task 651 * queue, if main_running is false. It should be called only from a 652 * interrupt or bottom half. 653 */ 654 655#include <linux/workqueue.h> 656#include <linux/interrupt.h> 657 658static volatile int main_running; 659static DECLARE_WORK(NCR5380_tqueue, (void (*)(void *))NCR5380_main, NULL); 660 661static inline void queue_main(void) 662{ 663 if (!main_running) { 664 /* If in interrupt and NCR5380_main() not already running, 665 queue it on the 'immediate' task queue, to be processed 666 immediately after the current interrupt processing has 667 finished. */ 668 schedule_work(&NCR5380_tqueue); 669 } 670 /* else: nothing to do: the running NCR5380_main() will pick up 671 any newly queued command. */ 672} 673 674 675static inline void NCR5380_all_init(void) 676{ 677 static int done = 0; 678 if (!done) { 679 INI_PRINTK("scsi : NCR5380_all_init()\n"); 680 done = 1; 681 } 682} 683 684 685/* 686 * Function : void NCR58380_print_options (struct Scsi_Host *instance) 687 * 688 * Purpose : called by probe code indicating the NCR5380 driver 689 * options that were selected. 690 * 691 * Inputs : instance, pointer to this instance. Unused. 692 */ 693 694static void __init NCR5380_print_options(struct Scsi_Host *instance) 695{ 696 printk(" generic options" 697#ifdef AUTOSENSE 698 " AUTOSENSE" 699#endif 700#ifdef REAL_DMA 701 " REAL DMA" 702#endif 703#ifdef PARITY 704 " PARITY" 705#endif 706#ifdef SUPPORT_TAGS 707 " SCSI-2 TAGGED QUEUING" 708#endif 709 ); 710 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); 711} 712 713/* 714 * Function : void NCR5380_print_status (struct Scsi_Host *instance) 715 * 716 * Purpose : print commands in the various queues, called from 717 * NCR5380_abort and NCR5380_debug to aid debugging. 718 * 719 * Inputs : instance, pointer to this instance. 720 */ 721 722static void NCR5380_print_status(struct Scsi_Host *instance) 723{ 724 char *pr_bfr; 725 char *start; 726 int len; 727 728 NCR_PRINT(NDEBUG_ANY); 729 NCR_PRINT_PHASE(NDEBUG_ANY); 730 731 pr_bfr = (char *)__get_free_page(GFP_ATOMIC); 732 if (!pr_bfr) { 733 printk("NCR5380_print_status: no memory for print buffer\n"); 734 return; 735 } 736 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0); 737 pr_bfr[len] = 0; 738 printk("\n%s\n", pr_bfr); 739 free_page((unsigned long)pr_bfr); 740} 741 742 743/******************************************/ 744/* 745 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] 746 * 747 * *buffer: I/O buffer 748 * **start: if inout == FALSE pointer into buffer where user read should start 749 * offset: current offset 750 * length: length of buffer 751 * hostno: Scsi_Host host_no 752 * inout: TRUE - user is writing; FALSE - user is reading 753 * 754 * Return the number of bytes read from or written 755*/ 756 757#undef SPRINTF 758#define SPRINTF(fmt,args...) \ 759 do { \ 760 if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \ 761 pos += sprintf(pos, fmt , ## args); \ 762 } while(0) 763static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length); 764 765static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, 766 char **start, off_t offset, int length, int inout) 767{ 768 char *pos = buffer; 769 struct NCR5380_hostdata *hostdata; 770 Scsi_Cmnd *ptr; 771 unsigned long flags; 772 off_t begin = 0; 773#define check_offset() \ 774 do { \ 775 if (pos - buffer < offset - begin) { \ 776 begin += pos - buffer; \ 777 pos = buffer; \ 778 } \ 779 } while (0) 780 781 hostdata = (struct NCR5380_hostdata *)instance->hostdata; 782 783 if (inout) /* Has data been written to the file ? */ 784 return -ENOSYS; /* Currently this is a no-op */ 785 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); 786 check_offset(); 787 local_irq_save(flags); 788 SPRINTF("NCR5380: coroutine is%s running.\n", 789 main_running ? "" : "n't"); 790 check_offset(); 791 if (!hostdata->connected) 792 SPRINTF("scsi%d: no currently connected command\n", HOSTNO); 793 else 794 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, 795 pos, buffer, length); 796 SPRINTF("scsi%d: issue_queue\n", HOSTNO); 797 check_offset(); 798 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) { 799 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 800 check_offset(); 801 } 802 803 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO); 804 check_offset(); 805 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; 806 ptr = NEXT(ptr)) { 807 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); 808 check_offset(); 809 } 810 811 local_irq_restore(flags); 812 *start = buffer + (offset - begin); 813 if (pos - buffer < offset - begin) 814 return 0; 815 else if (pos - buffer - (offset - begin) < length) 816 return pos - buffer - (offset - begin); 817 return length; 818} 819 820static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length) 821{ 822 int i, s; 823 unsigned char *command; 824 SPRINTF("scsi%d: destination target %d, lun %d\n", 825 H_NO(cmd), cmd->device->id, cmd->device->lun); 826 SPRINTF(" command = "); 827 command = cmd->cmnd; 828 SPRINTF("%2d (0x%02x)", command[0], command[0]); 829 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) 830 SPRINTF(" %02x", command[i]); 831 SPRINTF("\n"); 832 return pos; 833} 834 835 836/* 837 * Function : void NCR5380_init (struct Scsi_Host *instance) 838 * 839 * Purpose : initializes *instance and corresponding 5380 chip. 840 * 841 * Inputs : instance - instantiation of the 5380 driver. 842 * 843 * Notes : I assume that the host, hostno, and id bits have been 844 * set correctly. I don't care about the irq and other fields. 845 * 846 */ 847 848static int NCR5380_init(struct Scsi_Host *instance, int flags) 849{ 850 int i; 851 SETUP_HOSTDATA(instance); 852 853 NCR5380_all_init(); 854 855 hostdata->aborted = 0; 856 hostdata->id_mask = 1 << instance->this_id; 857 hostdata->id_higher_mask = 0; 858 for (i = hostdata->id_mask; i <= 0x80; i <<= 1) 859 if (i > hostdata->id_mask) 860 hostdata->id_higher_mask |= i; 861 for (i = 0; i < 8; ++i) 862 hostdata->busy[i] = 0; 863#ifdef SUPPORT_TAGS 864 init_tags(); 865#endif 866#if defined (REAL_DMA) 867 hostdata->dma_len = 0; 868#endif 869 hostdata->targets_present = 0; 870 hostdata->connected = NULL; 871 hostdata->issue_queue = NULL; 872 hostdata->disconnected_queue = NULL; 873 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; 874 875 if (!the_template) { 876 the_template = instance->hostt; 877 first_instance = instance; 878 } 879 880#ifndef AUTOSENSE 881 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) 882 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" 883 " without AUTOSENSE option, contingent allegiance conditions may\n" 884 " be incorrectly cleared.\n", HOSTNO); 885#endif /* def AUTOSENSE */ 886 887 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 888 NCR5380_write(MODE_REG, MR_BASE); 889 NCR5380_write(TARGET_COMMAND_REG, 0); 890 NCR5380_write(SELECT_ENABLE_REG, 0); 891 892 return 0; 893} 894 895/* 896 * our own old-style timeout update 897 */ 898/* 899 * The strategy is to cause the timer code to call scsi_times_out() 900 * when the soonest timeout is pending. 901 * The arguments are used when we are queueing a new command, because 902 * we do not want to subtract the time used from this time, but when we 903 * set the timer, we want to take this value into account. 904 */ 905 906int atari_scsi_update_timeout(Scsi_Cmnd * SCset, int timeout) 907{ 908 int rtn; 909 910 /* 911 * We are using the new error handling code to actually register/deregister 912 * timers for timeout. 913 */ 914 915 if (!timer_pending(&SCset->eh_timeout)) 916 rtn = 0; 917 else 918 rtn = SCset->eh_timeout.expires - jiffies; 919 920 if (timeout == 0) { 921 del_timer(&SCset->eh_timeout); 922 SCset->eh_timeout.data = (unsigned long)NULL; 923 SCset->eh_timeout.expires = 0; 924 } else { 925 if (SCset->eh_timeout.data != (unsigned long)NULL) 926 del_timer(&SCset->eh_timeout); 927 SCset->eh_timeout.data = (unsigned long)SCset; 928 SCset->eh_timeout.expires = jiffies + timeout; 929 add_timer(&SCset->eh_timeout); 930 } 931 return rtn; 932} 933 934/* 935 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, 936 * void (*done)(Scsi_Cmnd *)) 937 * 938 * Purpose : enqueues a SCSI command 939 * 940 * Inputs : cmd - SCSI command, done - function called on completion, with 941 * a pointer to the command descriptor. 942 * 943 * Returns : 0 944 * 945 * Side effects : 946 * cmd is added to the per instance issue_queue, with minor 947 * twiddling done to the host specific fields of cmd. If the 948 * main coroutine is not running, it is restarted. 949 * 950 */ 951 952static int NCR5380_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) 953{ 954 SETUP_HOSTDATA(cmd->device->host); 955 Scsi_Cmnd *tmp; 956 int oldto; 957 unsigned long flags; 958 // extern int update_timeout(Scsi_Cmnd * SCset, int timeout); 959 960#if (NDEBUG & NDEBUG_NO_WRITE) 961 switch (cmd->cmnd[0]) { 962 case WRITE_6: 963 case WRITE_10: 964 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", 965 H_NO(cmd)); 966 cmd->result = (DID_ERROR << 16); 967 done(cmd); 968 return 0; 969 } 970#endif /* (NDEBUG & NDEBUG_NO_WRITE) */ 971 972#ifdef NCR5380_STATS 973# if 0 974 if (!hostdata->connected && !hostdata->issue_queue && 975 !hostdata->disconnected_queue) { 976 hostdata->timebase = jiffies; 977 } 978# endif 979# ifdef NCR5380_STAT_LIMIT 980 if (cmd->request_bufflen > NCR5380_STAT_LIMIT) 981# endif 982 switch (cmd->cmnd[0]) { 983 case WRITE: 984 case WRITE_6: 985 case WRITE_10: 986 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); 987 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; 988 hostdata->pendingw++; 989 break; 990 case READ: 991 case READ_6: 992 case READ_10: 993 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); 994 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; 995 hostdata->pendingr++; 996 break; 997 } 998#endif 999 1000 /* 1001 * We use the host_scribble field as a pointer to the next command 1002 * in a queue 1003 */ 1004 1005 NEXT(cmd) = NULL; 1006 cmd->scsi_done = done; 1007 1008 cmd->result = 0; 1009 1010 /* 1011 * Insert the cmd into the issue queue. Note that REQUEST SENSE 1012 * commands are added to the head of the queue since any command will 1013 * clear the contingent allegiance condition that exists and the 1014 * sense data is only guaranteed to be valid while the condition exists. 1015 */ 1016 1017 local_irq_save(flags); 1018 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. 1019 * Otherwise a running NCR5380_main may steal the lock. 1020 * Lock before actually inserting due to fairness reasons explained in 1021 * atari_scsi.c. If we insert first, then it's impossible for this driver 1022 * to release the lock. 1023 * Stop timer for this command while waiting for the lock, or timeouts 1024 * may happen (and they really do), and it's no good if the command doesn't 1025 * appear in any of the queues. 1026 * ++roman: Just disabling the NCR interrupt isn't sufficient here, 1027 * because also a timer int can trigger an abort or reset, which would 1028 * alter queues and touch the lock. 1029 */ 1030 if (!IS_A_TT()) { 1031 oldto = atari_scsi_update_timeout(cmd, 0); 1032 falcon_get_lock(); 1033 atari_scsi_update_timeout(cmd, oldto); 1034 } 1035 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { 1036 LIST(cmd, hostdata->issue_queue); 1037 NEXT(cmd) = hostdata->issue_queue; 1038 hostdata->issue_queue = cmd; 1039 } else { 1040 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue; 1041 NEXT(tmp); tmp = NEXT(tmp)) 1042 ; 1043 LIST(cmd, tmp); 1044 NEXT(tmp) = cmd; 1045 } 1046 local_irq_restore(flags); 1047 1048 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd), 1049 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); 1050 1051 /* If queue_command() is called from an interrupt (real one or bottom 1052 * half), we let queue_main() do the job of taking care about main. If it 1053 * is already running, this is a no-op, else main will be queued. 1054 * 1055 * If we're not in an interrupt, we can call NCR5380_main() 1056 * unconditionally, because it cannot be already running. 1057 */ 1058 if (in_interrupt() || ((flags >> 8) & 7) >= 6) 1059 queue_main(); 1060 else 1061 NCR5380_main(NULL); 1062 return 0; 1063} 1064 1065/* 1066 * Function : NCR5380_main (void) 1067 * 1068 * Purpose : NCR5380_main is a coroutine that runs as long as more work can 1069 * be done on the NCR5380 host adapters in a system. Both 1070 * NCR5380_queue_command() and NCR5380_intr() will try to start it 1071 * in case it is not running. 1072 * 1073 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should 1074 * reenable them. This prevents reentrancy and kernel stack overflow. 1075 */ 1076 1077static void NCR5380_main(void *bl) 1078{ 1079 Scsi_Cmnd *tmp, *prev; 1080 struct Scsi_Host *instance = first_instance; 1081 struct NCR5380_hostdata *hostdata = HOSTDATA(instance); 1082 int done; 1083 unsigned long flags; 1084 1085 /* 1086 * We run (with interrupts disabled) until we're sure that none of 1087 * the host adapters have anything that can be done, at which point 1088 * we set main_running to 0 and exit. 1089 * 1090 * Interrupts are enabled before doing various other internal 1091 * instructions, after we've decided that we need to run through 1092 * the loop again. 1093 * 1094 * this should prevent any race conditions. 1095 * 1096 * ++roman: Just disabling the NCR interrupt isn't sufficient here, 1097 * because also a timer int can trigger an abort or reset, which can 1098 * alter queues and touch the Falcon lock. 1099 */ 1100 1101 /* Tell int handlers main() is now already executing. Note that 1102 no races are possible here. If an int comes in before 1103 'main_running' is set here, and queues/executes main via the 1104 task queue, it doesn't do any harm, just this instance of main 1105 won't find any work left to do. */ 1106 if (main_running) 1107 return; 1108 main_running = 1; 1109 1110 local_save_flags(flags); 1111 do { 1112 local_irq_disable(); /* Freeze request queues */ 1113 done = 1; 1114 1115 if (!hostdata->connected) { 1116 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO); 1117 /* 1118 * Search through the issue_queue for a command destined 1119 * for a target that's not busy. 1120 */ 1121#if (NDEBUG & NDEBUG_LISTS) 1122 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; 1123 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) 1124 ; 1125 /*printk("%p ", tmp);*/ 1126 if ((tmp == prev) && tmp) 1127 printk(" LOOP\n"); 1128 /* else printk("\n"); */ 1129#endif 1130 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, 1131 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) { 1132 1133#if (NDEBUG & NDEBUG_LISTS) 1134 if (prev != tmp) 1135 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", 1136 tmp, tmp->device->id, hostdata->busy[tmp->device->id], 1137 tmp->device->lun); 1138#endif 1139 /* When we find one, remove it from the issue queue. */ 1140 /* ++guenther: possible race with Falcon locking */ 1141 if ( 1142#ifdef SUPPORT_TAGS 1143 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) 1144#else 1145 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) 1146#endif 1147 ) { 1148 /* ++guenther: just to be sure, this must be atomic */ 1149 local_irq_disable(); 1150 if (prev) { 1151 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); 1152 NEXT(prev) = NEXT(tmp); 1153 } else { 1154 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); 1155 hostdata->issue_queue = NEXT(tmp); 1156 } 1157 NEXT(tmp) = NULL; 1158 falcon_dont_release++; 1159 1160 /* reenable interrupts after finding one */ 1161 local_irq_restore(flags); 1162 1163 /* 1164 * Attempt to establish an I_T_L nexus here. 1165 * On success, instance->hostdata->connected is set. 1166 * On failure, we must add the command back to the 1167 * issue queue so we can keep trying. 1168 */ 1169 MAIN_PRINTK("scsi%d: main(): command for target %d " 1170 "lun %d removed from issue_queue\n", 1171 HOSTNO, tmp->device->id, tmp->device->lun); 1172 /* 1173 * REQUEST SENSE commands are issued without tagged 1174 * queueing, even on SCSI-II devices because the 1175 * contingent allegiance condition exists for the 1176 * entire unit. 1177 */ 1178 /* ++roman: ...and the standard also requires that 1179 * REQUEST SENSE command are untagged. 1180 */ 1181 1182#ifdef SUPPORT_TAGS 1183 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE); 1184#endif 1185 if (!NCR5380_select(instance, tmp, 1186 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : 1187 TAG_NEXT)) { 1188 falcon_dont_release--; 1189 /* release if target did not response! */ 1190 falcon_release_lock_if_possible(hostdata); 1191 break; 1192 } else { 1193 local_irq_disable(); 1194 LIST(tmp, hostdata->issue_queue); 1195 NEXT(tmp) = hostdata->issue_queue; 1196 hostdata->issue_queue = tmp; 1197#ifdef SUPPORT_TAGS 1198 cmd_free_tag(tmp); 1199#endif 1200 falcon_dont_release--; 1201 local_irq_restore(flags); 1202 MAIN_PRINTK("scsi%d: main(): select() failed, " 1203 "returned to issue_queue\n", HOSTNO); 1204 if (hostdata->connected) 1205 break; 1206 } 1207 } /* if target/lun/target queue is not busy */ 1208 } /* for issue_queue */ 1209 } /* if (!hostdata->connected) */ 1210 1211 if (hostdata->connected 1212#ifdef REAL_DMA 1213 && !hostdata->dma_len 1214#endif 1215 ) { 1216 local_irq_restore(flags); 1217 MAIN_PRINTK("scsi%d: main: performing information transfer\n", 1218 HOSTNO); 1219 NCR5380_information_transfer(instance); 1220 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO); 1221 done = 0; 1222 } 1223 } while (!done); 1224 1225 /* Better allow ints _after_ 'main_running' has been cleared, else 1226 an interrupt could believe we'll pick up the work it left for 1227 us, but we won't see it anymore here... */ 1228 main_running = 0; 1229 local_irq_restore(flags); 1230} 1231 1232 1233#ifdef REAL_DMA 1234/* 1235 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) 1236 * 1237 * Purpose : Called by interrupt handler when DMA finishes or a phase 1238 * mismatch occurs (which would finish the DMA transfer). 1239 * 1240 * Inputs : instance - this instance of the NCR5380. 1241 * 1242 */ 1243 1244static void NCR5380_dma_complete(struct Scsi_Host *instance) 1245{ 1246 SETUP_HOSTDATA(instance); 1247 int transfered, saved_data = 0, overrun = 0, cnt, toPIO; 1248 unsigned char **data, p; 1249 volatile int *count; 1250 1251 if (!hostdata->connected) { 1252 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " 1253 "no connected cmd\n", HOSTNO); 1254 return; 1255 } 1256 1257 if (atari_read_overruns) { 1258 p = hostdata->connected->SCp.phase; 1259 if (p & SR_IO) { 1260 udelay(10); 1261 if ((NCR5380_read(BUS_AND_STATUS_REG) & 1262 (BASR_PHASE_MATCH|BASR_ACK)) == 1263 (BASR_PHASE_MATCH|BASR_ACK)) { 1264 saved_data = NCR5380_read(INPUT_DATA_REG); 1265 overrun = 1; 1266 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO); 1267 } 1268 } 1269 } 1270 1271 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", 1272 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), 1273 NCR5380_read(STATUS_REG)); 1274 1275 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1276 NCR5380_write(MODE_REG, MR_BASE); 1277 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1278 1279 transfered = hostdata->dma_len - NCR5380_dma_residual(instance); 1280 hostdata->dma_len = 0; 1281 1282 data = (unsigned char **)&hostdata->connected->SCp.ptr; 1283 count = &hostdata->connected->SCp.this_residual; 1284 *data += transfered; 1285 *count -= transfered; 1286 1287 if (atari_read_overruns) { 1288 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) { 1289 cnt = toPIO = atari_read_overruns; 1290 if (overrun) { 1291 DMA_PRINTK("Got an input overrun, using saved byte\n"); 1292 *(*data)++ = saved_data; 1293 (*count)--; 1294 cnt--; 1295 toPIO--; 1296 } 1297 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data); 1298 NCR5380_transfer_pio(instance, &p, &cnt, data); 1299 *count -= toPIO - cnt; 1300 } 1301 } 1302} 1303#endif /* REAL_DMA */ 1304 1305 1306/* 1307 * Function : void NCR5380_intr (int irq) 1308 * 1309 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses 1310 * from the disconnected queue, and restarting NCR5380_main() 1311 * as required. 1312 * 1313 * Inputs : int irq, irq that caused this interrupt. 1314 * 1315 */ 1316 1317static irqreturn_t NCR5380_intr(int irq, void *dev_id) 1318{ 1319 struct Scsi_Host *instance = first_instance; 1320 int done = 1, handled = 0; 1321 unsigned char basr; 1322 1323 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO); 1324 1325 /* Look for pending interrupts */ 1326 basr = NCR5380_read(BUS_AND_STATUS_REG); 1327 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr); 1328 /* dispatch to appropriate routine if found and done=0 */ 1329 if (basr & BASR_IRQ) { 1330 NCR_PRINT(NDEBUG_INTR); 1331 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { 1332 done = 0; 1333 ENABLE_IRQ(); 1334 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO); 1335 NCR5380_reselect(instance); 1336 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1337 } else if (basr & BASR_PARITY_ERROR) { 1338 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO); 1339 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1340 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { 1341 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO); 1342 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1343 } else { 1344 /* 1345 * The rest of the interrupt conditions can occur only during a 1346 * DMA transfer 1347 */ 1348 1349#if defined(REAL_DMA) 1350 /* 1351 * We should only get PHASE MISMATCH and EOP interrupts if we have 1352 * DMA enabled, so do a sanity check based on the current setting 1353 * of the MODE register. 1354 */ 1355 1356 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && 1357 ((basr & BASR_END_DMA_TRANSFER) || 1358 !(basr & BASR_PHASE_MATCH))) { 1359 1360 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); 1361 NCR5380_dma_complete( instance ); 1362 done = 0; 1363 ENABLE_IRQ(); 1364 } else 1365#endif /* REAL_DMA */ 1366 { 1367/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ 1368 if (basr & BASR_PHASE_MATCH) 1369 printk(KERN_NOTICE "scsi%d: unknown interrupt, " 1370 "BASR 0x%x, MR 0x%x, SR 0x%x\n", 1371 HOSTNO, basr, NCR5380_read(MODE_REG), 1372 NCR5380_read(STATUS_REG)); 1373 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1374 } 1375 } /* if !(SELECTION || PARITY) */ 1376 handled = 1; 1377 } /* BASR & IRQ */ else { 1378 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " 1379 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, 1380 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); 1381 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 1382 } 1383 1384 if (!done) { 1385 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO); 1386 /* Put a call to NCR5380_main() on the queue... */ 1387 queue_main(); 1388 } 1389 return IRQ_RETVAL(handled); 1390} 1391 1392#ifdef NCR5380_STATS 1393static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd) 1394{ 1395# ifdef NCR5380_STAT_LIMIT 1396 if (cmd->request_bufflen > NCR5380_STAT_LIMIT) 1397# endif 1398 switch (cmd->cmnd[0]) { 1399 case WRITE: 1400 case WRITE_6: 1401 case WRITE_10: 1402 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); 1403 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/ 1404 hostdata->pendingw--; 1405 break; 1406 case READ: 1407 case READ_6: 1408 case READ_10: 1409 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); 1410 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/ 1411 hostdata->pendingr--; 1412 break; 1413 } 1414} 1415#endif 1416 1417/* 1418 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, 1419 * int tag); 1420 * 1421 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, 1422 * including ARBITRATION, SELECTION, and initial message out for 1423 * IDENTIFY and queue messages. 1424 * 1425 * Inputs : instance - instantiation of the 5380 driver on which this 1426 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 1427 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 1428 * the command that is presently connected. 1429 * 1430 * Returns : -1 if selection could not execute for some reason, 1431 * 0 if selection succeeded or failed because the target 1432 * did not respond. 1433 * 1434 * Side effects : 1435 * If bus busy, arbitration failed, etc, NCR5380_select() will exit 1436 * with registers as they should have been on entry - ie 1437 * SELECT_ENABLE will be set appropriately, the NCR5380 1438 * will cease to drive any SCSI bus signals. 1439 * 1440 * If successful : I_T_L or I_T_L_Q nexus will be established, 1441 * instance->connected will be set to cmd. 1442 * SELECT interrupt will be disabled. 1443 * 1444 * If failed (no target) : cmd->scsi_done() will be called, and the 1445 * cmd->result host byte set to DID_BAD_TARGET. 1446 */ 1447 1448static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag) 1449{ 1450 SETUP_HOSTDATA(instance); 1451 unsigned char tmp[3], phase; 1452 unsigned char *data; 1453 int len; 1454 unsigned long timeout; 1455 unsigned long flags; 1456 1457 hostdata->restart_select = 0; 1458 NCR_PRINT(NDEBUG_ARBITRATION); 1459 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO, 1460 instance->this_id); 1461 1462 /* 1463 * Set the phase bits to 0, otherwise the NCR5380 won't drive the 1464 * data bus during SELECTION. 1465 */ 1466 1467 local_irq_save(flags); 1468 if (hostdata->connected) { 1469 local_irq_restore(flags); 1470 return -1; 1471 } 1472 NCR5380_write(TARGET_COMMAND_REG, 0); 1473 1474 /* 1475 * Start arbitration. 1476 */ 1477 1478 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); 1479 NCR5380_write(MODE_REG, MR_ARBITRATE); 1480 1481 local_irq_restore(flags); 1482 1483 /* Wait for arbitration logic to complete */ 1484#if defined(NCR_TIMEOUT) 1485 { 1486 unsigned long timeout = jiffies + 2*NCR_TIMEOUT; 1487 1488 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && 1489 time_before(jiffies, timeout) && !hostdata->connected) 1490 ; 1491 if (time_after_eq(jiffies, timeout)) { 1492 printk("scsi : arbitration timeout at %d\n", __LINE__); 1493 NCR5380_write(MODE_REG, MR_BASE); 1494 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1495 return -1; 1496 } 1497 } 1498#else /* NCR_TIMEOUT */ 1499 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) && 1500 !hostdata->connected) 1501 ; 1502#endif 1503 1504 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO); 1505 1506 if (hostdata->connected) { 1507 NCR5380_write(MODE_REG, MR_BASE); 1508 return -1; 1509 } 1510 /* 1511 * The arbitration delay is 2.2us, but this is a minimum and there is 1512 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate 1513 * the integral nature of udelay(). 1514 * 1515 */ 1516 1517 udelay(3); 1518 1519 /* Check for lost arbitration */ 1520 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1521 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || 1522 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1523 hostdata->connected) { 1524 NCR5380_write(MODE_REG, MR_BASE); 1525 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", 1526 HOSTNO); 1527 return -1; 1528 } 1529 1530 /* after/during arbitration, BSY should be asserted. 1531 IBM DPES-31080 Version S31Q works now */ 1532 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ 1533 NCR5380_write(INITIATOR_COMMAND_REG, 1534 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY); 1535 1536 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || 1537 hostdata->connected) { 1538 NCR5380_write(MODE_REG, MR_BASE); 1539 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1540 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", 1541 HOSTNO); 1542 return -1; 1543 } 1544 1545 /* 1546 * Again, bus clear + bus settle time is 1.2us, however, this is 1547 * a minimum so we'll udelay ceil(1.2) 1548 */ 1549 1550#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY 1551 /* ++roman: But some targets (see above :-) seem to need a bit more... */ 1552 udelay(15); 1553#else 1554 udelay(2); 1555#endif 1556 1557 if (hostdata->connected) { 1558 NCR5380_write(MODE_REG, MR_BASE); 1559 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1560 return -1; 1561 } 1562 1563 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO); 1564 1565 /* 1566 * Now that we have won arbitration, start Selection process, asserting 1567 * the host and target ID's on the SCSI bus. 1568 */ 1569 1570 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); 1571 1572 /* 1573 * Raise ATN while SEL is true before BSY goes false from arbitration, 1574 * since this is the only way to guarantee that we'll get a MESSAGE OUT 1575 * phase immediately after selection. 1576 */ 1577 1578 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | 1579 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); 1580 NCR5380_write(MODE_REG, MR_BASE); 1581 1582 /* 1583 * Reselect interrupts must be turned off prior to the dropping of BSY, 1584 * otherwise we will trigger an interrupt. 1585 */ 1586 1587 if (hostdata->connected) { 1588 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1589 return -1; 1590 } 1591 1592 NCR5380_write(SELECT_ENABLE_REG, 0); 1593 1594 /* 1595 * The initiator shall then wait at least two deskew delays and release 1596 * the BSY signal. 1597 */ 1598 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ 1599 1600 /* Reset BSY */ 1601 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | 1602 ICR_ASSERT_ATN | ICR_ASSERT_SEL)); 1603 1604 /* 1605 * Something weird happens when we cease to drive BSY - looks 1606 * like the board/chip is letting us do another read before the 1607 * appropriate propagation delay has expired, and we're confusing 1608 * a BSY signal from ourselves as the target's response to SELECTION. 1609 * 1610 * A small delay (the 'C++' frontend breaks the pipeline with an 1611 * unnecessary jump, making it work on my 386-33/Trantor T128, the 1612 * tighter 'C' code breaks and requires this) solves the problem - 1613 * the 1 us delay is arbitrary, and only used because this delay will 1614 * be the same on other platforms and since it works here, it should 1615 * work there. 1616 * 1617 * wingel suggests that this could be due to failing to wait 1618 * one deskew delay. 1619 */ 1620 1621 udelay(1); 1622 1623 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); 1624 1625 /* 1626 * The SCSI specification calls for a 250 ms timeout for the actual 1627 * selection. 1628 */ 1629 1630 timeout = jiffies + 25; 1631 1632 /* 1633 * XXX very interesting - we're seeing a bounce where the BSY we 1634 * asserted is being reflected / still asserted (propagation delay?) 1635 * and it's detecting as true. Sigh. 1636 */ 1637 1638#if 0 1639 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert 1640 * IO while SEL is true. But again, there are some disks out the in the 1641 * world that do that nevertheless. (Somebody claimed that this announces 1642 * reselection capability of the target.) So we better skip that test and 1643 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) 1644 */ 1645 1646 while (time_before(jiffies, timeout) && 1647 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO))) 1648 ; 1649 1650 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { 1651 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1652 NCR5380_reselect(instance); 1653 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n", 1654 HOSTNO); 1655 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1656 return -1; 1657 } 1658#else 1659 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)) 1660 ; 1661#endif 1662 1663 /* 1664 * No less than two deskew delays after the initiator detects the 1665 * BSY signal is true, it shall release the SEL signal and may 1666 * change the DATA BUS. -wingel 1667 */ 1668 1669 udelay(1); 1670 1671 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1672 1673 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { 1674 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1675 if (hostdata->targets_present & (1 << cmd->device->id)) { 1676 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); 1677 if (hostdata->restart_select) 1678 printk(KERN_NOTICE "\trestart select\n"); 1679 NCR_PRINT(NDEBUG_ANY); 1680 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1681 return -1; 1682 } 1683 cmd->result = DID_BAD_TARGET << 16; 1684#ifdef NCR5380_STATS 1685 collect_stats(hostdata, cmd); 1686#endif 1687#ifdef SUPPORT_TAGS 1688 cmd_free_tag(cmd); 1689#endif 1690 cmd->scsi_done(cmd); 1691 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1692 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO); 1693 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 1694 return 0; 1695 } 1696 1697 hostdata->targets_present |= (1 << cmd->device->id); 1698 1699 /* 1700 * Since we followed the SCSI spec, and raised ATN while SEL 1701 * was true but before BSY was false during selection, the information 1702 * transfer phase should be a MESSAGE OUT phase so that we can send the 1703 * IDENTIFY message. 1704 * 1705 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG 1706 * message (2 bytes) with a tag ID that we increment with every command 1707 * until it wraps back to 0. 1708 * 1709 * XXX - it turns out that there are some broken SCSI-II devices, 1710 * which claim to support tagged queuing but fail when more than 1711 * some number of commands are issued at once. 1712 */ 1713 1714 /* Wait for start of REQ/ACK handshake */ 1715 while (!(NCR5380_read(STATUS_REG) & SR_REQ)) 1716 ; 1717 1718 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n", 1719 HOSTNO, cmd->device->id); 1720 tmp[0] = IDENTIFY(1, cmd->device->lun); 1721 1722#ifdef SUPPORT_TAGS 1723 if (cmd->tag != TAG_NONE) { 1724 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; 1725 tmp[2] = cmd->tag; 1726 len = 3; 1727 } else 1728 len = 1; 1729#else 1730 len = 1; 1731 cmd->tag = 0; 1732#endif /* SUPPORT_TAGS */ 1733 1734 /* Send message(s) */ 1735 data = tmp; 1736 phase = PHASE_MSGOUT; 1737 NCR5380_transfer_pio(instance, &phase, &len, &data); 1738 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO); 1739 /* XXX need to handle errors here */ 1740 hostdata->connected = cmd; 1741#ifndef SUPPORT_TAGS 1742 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 1743#endif 1744 1745 initialize_SCp(cmd); 1746 1747 return 0; 1748} 1749 1750/* 1751 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 1752 * unsigned char *phase, int *count, unsigned char **data) 1753 * 1754 * Purpose : transfers data in given phase using polled I/O 1755 * 1756 * Inputs : instance - instance of driver, *phase - pointer to 1757 * what phase is expected, *count - pointer to number of 1758 * bytes to transfer, **data - pointer to data pointer. 1759 * 1760 * Returns : -1 when different phase is entered without transferring 1761 * maximum number of bytes, 0 if all bytes are transfered or exit 1762 * is in same phase. 1763 * 1764 * Also, *phase, *count, *data are modified in place. 1765 * 1766 * XXX Note : handling for bus free may be useful. 1767 */ 1768 1769/* 1770 * Note : this code is not as quick as it could be, however it 1771 * IS 100% reliable, and for the actual data transfer where speed 1772 * counts, we will always do a pseudo DMA or DMA transfer. 1773 */ 1774 1775static int NCR5380_transfer_pio(struct Scsi_Host *instance, 1776 unsigned char *phase, int *count, 1777 unsigned char **data) 1778{ 1779 register unsigned char p = *phase, tmp; 1780 register int c = *count; 1781 register unsigned char *d = *data; 1782 1783 /* 1784 * The NCR5380 chip will only drive the SCSI bus when the 1785 * phase specified in the appropriate bits of the TARGET COMMAND 1786 * REGISTER match the STATUS REGISTER 1787 */ 1788 1789 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1790 1791 do { 1792 /* 1793 * Wait for assertion of REQ, after which the phase bits will be 1794 * valid 1795 */ 1796 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)) 1797 ; 1798 1799 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO); 1800 1801 /* Check for phase mismatch */ 1802 if ((tmp & PHASE_MASK) != p) { 1803 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO); 1804 NCR_PRINT_PHASE(NDEBUG_PIO); 1805 break; 1806 } 1807 1808 /* Do actual transfer from SCSI bus to / from memory */ 1809 if (!(p & SR_IO)) 1810 NCR5380_write(OUTPUT_DATA_REG, *d); 1811 else 1812 *d = NCR5380_read(CURRENT_SCSI_DATA_REG); 1813 1814 ++d; 1815 1816 /* 1817 * The SCSI standard suggests that in MSGOUT phase, the initiator 1818 * should drop ATN on the last byte of the message phase 1819 * after REQ has been asserted for the handshake but before 1820 * the initiator raises ACK. 1821 */ 1822 1823 if (!(p & SR_IO)) { 1824 if (!((p & SR_MSG) && c > 1)) { 1825 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 1826 NCR_PRINT(NDEBUG_PIO); 1827 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1828 ICR_ASSERT_DATA | ICR_ASSERT_ACK); 1829 } else { 1830 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1831 ICR_ASSERT_DATA | ICR_ASSERT_ATN); 1832 NCR_PRINT(NDEBUG_PIO); 1833 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 1834 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); 1835 } 1836 } else { 1837 NCR_PRINT(NDEBUG_PIO); 1838 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); 1839 } 1840 1841 while (NCR5380_read(STATUS_REG) & SR_REQ) 1842 ; 1843 1844 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO); 1845 1846 /* 1847 * We have several special cases to consider during REQ/ACK handshaking : 1848 * 1. We were in MSGOUT phase, and we are on the last byte of the 1849 * message. ATN must be dropped as ACK is dropped. 1850 * 1851 * 2. We are in a MSGIN phase, and we are on the last byte of the 1852 * message. We must exit with ACK asserted, so that the calling 1853 * code may raise ATN before dropping ACK to reject the message. 1854 * 1855 * 3. ACK and ATN are clear and the target may proceed as normal. 1856 */ 1857 if (!(p == PHASE_MSGIN && c == 1)) { 1858 if (p == PHASE_MSGOUT && c > 1) 1859 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1860 else 1861 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 1862 } 1863 } while (--c); 1864 1865 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c); 1866 1867 *count = c; 1868 *data = d; 1869 tmp = NCR5380_read(STATUS_REG); 1870 /* The phase read from the bus is valid if either REQ is (already) 1871 * asserted or if ACK hasn't been released yet. The latter is the case if 1872 * we're in MSGIN and all wanted bytes have been received. 1873 */ 1874 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) 1875 *phase = tmp & PHASE_MASK; 1876 else 1877 *phase = PHASE_UNKNOWN; 1878 1879 if (!c || (*phase == p)) 1880 return 0; 1881 else 1882 return -1; 1883} 1884 1885/* 1886 * Function : do_abort (Scsi_Host *host) 1887 * 1888 * Purpose : abort the currently established nexus. Should only be 1889 * called from a routine which can drop into a 1890 * 1891 * Returns : 0 on success, -1 on failure. 1892 */ 1893 1894static int do_abort(struct Scsi_Host *host) 1895{ 1896 unsigned char tmp, *msgptr, phase; 1897 int len; 1898 1899 /* Request message out phase */ 1900 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1901 1902 /* 1903 * Wait for the target to indicate a valid phase by asserting 1904 * REQ. Once this happens, we'll have either a MSGOUT phase 1905 * and can immediately send the ABORT message, or we'll have some 1906 * other phase and will have to source/sink data. 1907 * 1908 * We really don't care what value was on the bus or what value 1909 * the target sees, so we just handshake. 1910 */ 1911 1912 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ) 1913 ; 1914 1915 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 1916 1917 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { 1918 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 1919 ICR_ASSERT_ACK); 1920 while (NCR5380_read(STATUS_REG) & SR_REQ) 1921 ; 1922 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 1923 } 1924 1925 tmp = ABORT; 1926 msgptr = &tmp; 1927 len = 1; 1928 phase = PHASE_MSGOUT; 1929 NCR5380_transfer_pio(host, &phase, &len, &msgptr); 1930 1931 /* 1932 * If we got here, and the command completed successfully, 1933 * we're about to go into bus free state. 1934 */ 1935 1936 return len ? -1 : 0; 1937} 1938 1939#if defined(REAL_DMA) 1940/* 1941 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 1942 * unsigned char *phase, int *count, unsigned char **data) 1943 * 1944 * Purpose : transfers data in given phase using either real 1945 * or pseudo DMA. 1946 * 1947 * Inputs : instance - instance of driver, *phase - pointer to 1948 * what phase is expected, *count - pointer to number of 1949 * bytes to transfer, **data - pointer to data pointer. 1950 * 1951 * Returns : -1 when different phase is entered without transferring 1952 * maximum number of bytes, 0 if all bytes or transfered or exit 1953 * is in same phase. 1954 * 1955 * Also, *phase, *count, *data are modified in place. 1956 * 1957 */ 1958 1959 1960static int NCR5380_transfer_dma(struct Scsi_Host *instance, 1961 unsigned char *phase, int *count, 1962 unsigned char **data) 1963{ 1964 SETUP_HOSTDATA(instance); 1965 register int c = *count; 1966 register unsigned char p = *phase; 1967 register unsigned char *d = *data; 1968 unsigned char tmp; 1969 unsigned long flags; 1970 1971 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { 1972 *phase = tmp; 1973 return -1; 1974 } 1975 1976 if (atari_read_overruns && (p & SR_IO)) 1977 c -= atari_read_overruns; 1978 1979 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n", 1980 HOSTNO, (p & SR_IO) ? "reading" : "writing", 1981 c, (p & SR_IO) ? "to" : "from", d); 1982 1983 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); 1984 1985#ifdef REAL_DMA 1986 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); 1987#endif /* def REAL_DMA */ 1988 1989 if (IS_A_TT()) { 1990 /* On the Medusa, it is a must to initialize the DMA before 1991 * starting the NCR. This is also the cleaner way for the TT. 1992 */ 1993 local_irq_save(flags); 1994 hostdata->dma_len = (p & SR_IO) ? 1995 NCR5380_dma_read_setup(instance, d, c) : 1996 NCR5380_dma_write_setup(instance, d, c); 1997 local_irq_restore(flags); 1998 } 1999 2000 if (p & SR_IO) 2001 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); 2002 else { 2003 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); 2004 NCR5380_write(START_DMA_SEND_REG, 0); 2005 } 2006 2007 if (!IS_A_TT()) { 2008 /* On the Falcon, the DMA setup must be done after the last */ 2009 /* NCR access, else the DMA setup gets trashed! 2010 */ 2011 local_irq_save(flags); 2012 hostdata->dma_len = (p & SR_IO) ? 2013 NCR5380_dma_read_setup(instance, d, c) : 2014 NCR5380_dma_write_setup(instance, d, c); 2015 local_irq_restore(flags); 2016 } 2017 return 0; 2018} 2019#endif /* defined(REAL_DMA) */ 2020 2021/* 2022 * Function : NCR5380_information_transfer (struct Scsi_Host *instance) 2023 * 2024 * Purpose : run through the various SCSI phases and do as the target 2025 * directs us to. Operates on the currently connected command, 2026 * instance->connected. 2027 * 2028 * Inputs : instance, instance for which we are doing commands 2029 * 2030 * Side effects : SCSI things happen, the disconnected queue will be 2031 * modified if a command disconnects, *instance->connected will 2032 * change. 2033 * 2034 * XXX Note : we need to watch for bus free or a reset condition here 2035 * to recover from an unexpected bus free condition. 2036 */ 2037 2038static void NCR5380_information_transfer(struct Scsi_Host *instance) 2039{ 2040 SETUP_HOSTDATA(instance); 2041 unsigned long flags; 2042 unsigned char msgout = NOP; 2043 int sink = 0; 2044 int len; 2045#if defined(REAL_DMA) 2046 int transfersize; 2047#endif 2048 unsigned char *data; 2049 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; 2050 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; 2051 2052 while (1) { 2053 tmp = NCR5380_read(STATUS_REG); 2054 /* We only have a valid SCSI phase when REQ is asserted */ 2055 if (tmp & SR_REQ) { 2056 phase = (tmp & PHASE_MASK); 2057 if (phase != old_phase) { 2058 old_phase = phase; 2059 NCR_PRINT_PHASE(NDEBUG_INFORMATION); 2060 } 2061 2062 if (sink && (phase != PHASE_MSGOUT)) { 2063 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); 2064 2065 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 2066 ICR_ASSERT_ACK); 2067 while (NCR5380_read(STATUS_REG) & SR_REQ) 2068 ; 2069 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 2070 ICR_ASSERT_ATN); 2071 sink = 0; 2072 continue; 2073 } 2074 2075 switch (phase) { 2076 case PHASE_DATAOUT: 2077#if (NDEBUG & NDEBUG_NO_DATAOUT) 2078 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " 2079 "aborted\n", HOSTNO); 2080 sink = 1; 2081 do_abort(instance); 2082 cmd->result = DID_ERROR << 16; 2083 cmd->done(cmd); 2084 return; 2085#endif 2086 case PHASE_DATAIN: 2087 /* 2088 * If there is no room left in the current buffer in the 2089 * scatter-gather list, move onto the next one. 2090 */ 2091 2092 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 2093 ++cmd->SCp.buffer; 2094 --cmd->SCp.buffers_residual; 2095 cmd->SCp.this_residual = cmd->SCp.buffer->length; 2096 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) + 2097 cmd->SCp.buffer->offset; 2098 /* ++roman: Try to merge some scatter-buffers if 2099 * they are at contiguous physical addresses. 2100 */ 2101 merge_contiguous_buffers(cmd); 2102 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n", 2103 HOSTNO, cmd->SCp.this_residual, 2104 cmd->SCp.buffers_residual); 2105 } 2106 2107 /* 2108 * The preferred transfer method is going to be 2109 * PSEUDO-DMA for systems that are strictly PIO, 2110 * since we can let the hardware do the handshaking. 2111 * 2112 * For this to work, we need to know the transfersize 2113 * ahead of time, since the pseudo-DMA code will sit 2114 * in an unconditional loop. 2115 */ 2116 2117 /* ++roman: I suggest, this should be 2118 * #if def(REAL_DMA) 2119 * instead of leaving REAL_DMA out. 2120 */ 2121 2122#if defined(REAL_DMA) 2123 if (!cmd->device->borken && 2124 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) { 2125 len = transfersize; 2126 cmd->SCp.phase = phase; 2127 if (NCR5380_transfer_dma(instance, &phase, 2128 &len, (unsigned char **)&cmd->SCp.ptr)) { 2129 /* 2130 * If the watchdog timer fires, all future 2131 * accesses to this device will use the 2132 * polled-IO. */ 2133 printk(KERN_NOTICE "scsi%d: switching target %d " 2134 "lun %d to slow handshake\n", HOSTNO, 2135 cmd->device->id, cmd->device->lun); 2136 cmd->device->borken = 1; 2137 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 2138 ICR_ASSERT_ATN); 2139 sink = 1; 2140 do_abort(instance); 2141 cmd->result = DID_ERROR << 16; 2142 cmd->done(cmd); 2143 /* XXX - need to source or sink data here, as appropriate */ 2144 } else { 2145#ifdef REAL_DMA 2146 /* ++roman: When using real DMA, 2147 * information_transfer() should return after 2148 * starting DMA since it has nothing more to 2149 * do. 2150 */ 2151 return; 2152#else 2153 cmd->SCp.this_residual -= transfersize - len; 2154#endif 2155 } 2156 } else 2157#endif /* defined(REAL_DMA) */ 2158 NCR5380_transfer_pio(instance, &phase, 2159 (int *)&cmd->SCp.this_residual, 2160 (unsigned char **)&cmd->SCp.ptr); 2161 break; 2162 case PHASE_MSGIN: 2163 len = 1; 2164 data = &tmp; 2165 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ 2166 NCR5380_transfer_pio(instance, &phase, &len, &data); 2167 cmd->SCp.Message = tmp; 2168 2169 switch (tmp) { 2170 /* 2171 * Linking lets us reduce the time required to get the 2172 * next command out to the device, hopefully this will 2173 * mean we don't waste another revolution due to the delays 2174 * required by ARBITRATION and another SELECTION. 2175 * 2176 * In the current implementation proposal, low level drivers 2177 * merely have to start the next command, pointed to by 2178 * next_link, done() is called as with unlinked commands. 2179 */ 2180#ifdef LINKED 2181 case LINKED_CMD_COMPLETE: 2182 case LINKED_FLG_CMD_COMPLETE: 2183 /* Accept message by clearing ACK */ 2184 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2185 2186 LNK_PRINTK("scsi%d: target %d lun %d linked command " 2187 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); 2188 2189 /* Enable reselect interrupts */ 2190 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2191 /* 2192 * Sanity check : A linked command should only terminate 2193 * with one of these messages if there are more linked 2194 * commands available. 2195 */ 2196 2197 if (!cmd->next_link) { 2198 printk(KERN_NOTICE "scsi%d: target %d lun %d " 2199 "linked command complete, no next_link\n", 2200 HOSTNO, cmd->device->id, cmd->device->lun); 2201 sink = 1; 2202 do_abort(instance); 2203 return; 2204 } 2205 2206 initialize_SCp(cmd->next_link); 2207 /* The next command is still part of this process; copy it 2208 * and don't free it! */ 2209 cmd->next_link->tag = cmd->tag; 2210 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2211 LNK_PRINTK("scsi%d: target %d lun %d linked request " 2212 "done, calling scsi_done().\n", 2213 HOSTNO, cmd->device->id, cmd->device->lun); 2214#ifdef NCR5380_STATS 2215 collect_stats(hostdata, cmd); 2216#endif 2217 cmd->scsi_done(cmd); 2218 cmd = hostdata->connected; 2219 break; 2220#endif /* def LINKED */ 2221 case ABORT: 2222 case COMMAND_COMPLETE: 2223 /* Accept message by clearing ACK */ 2224 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2225 /* ++guenther: possible race with Falcon locking */ 2226 falcon_dont_release++; 2227 hostdata->connected = NULL; 2228 QU_PRINTK("scsi%d: command for target %d, lun %d " 2229 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); 2230#ifdef SUPPORT_TAGS 2231 cmd_free_tag(cmd); 2232 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { 2233 /* Turn a QUEUE FULL status into BUSY, I think the 2234 * mid level cannot handle QUEUE FULL :-( (The 2235 * command is retried after BUSY). Also update our 2236 * queue size to the number of currently issued 2237 * commands now. 2238 */ 2239 /* ++Andreas: the mid level code knows about 2240 QUEUE_FULL now. */ 2241 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; 2242 TAG_PRINTK("scsi%d: target %d lun %d returned " 2243 "QUEUE_FULL after %d commands\n", 2244 HOSTNO, cmd->device->id, cmd->device->lun, 2245 ta->nr_allocated); 2246 if (ta->queue_size > ta->nr_allocated) 2247 ta->nr_allocated = ta->queue_size; 2248 } 2249#else 2250 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2251#endif 2252 /* Enable reselect interrupts */ 2253 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2254 2255 /* 2256 * I'm not sure what the correct thing to do here is : 2257 * 2258 * If the command that just executed is NOT a request 2259 * sense, the obvious thing to do is to set the result 2260 * code to the values of the stored parameters. 2261 * 2262 * If it was a REQUEST SENSE command, we need some way to 2263 * differentiate between the failure code of the original 2264 * and the failure code of the REQUEST sense - the obvious 2265 * case is success, where we fall through and leave the 2266 * result code unchanged. 2267 * 2268 * The non-obvious place is where the REQUEST SENSE failed 2269 */ 2270 2271 if (cmd->cmnd[0] != REQUEST_SENSE) 2272 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 2273 else if (status_byte(cmd->SCp.Status) != GOOD) 2274 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); 2275 2276#ifdef AUTOSENSE 2277 if ((cmd->cmnd[0] != REQUEST_SENSE) && 2278 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { 2279 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO); 2280 cmd->cmnd[0] = REQUEST_SENSE; 2281 cmd->cmnd[1] &= 0xe0; 2282 cmd->cmnd[2] = 0; 2283 cmd->cmnd[3] = 0; 2284 cmd->cmnd[4] = sizeof(cmd->sense_buffer); 2285 cmd->cmnd[5] = 0; 2286 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]); 2287 2288 cmd->use_sg = 0; 2289 /* this is initialized from initialize_SCp 2290 cmd->SCp.buffer = NULL; 2291 cmd->SCp.buffers_residual = 0; 2292 */ 2293 cmd->request_buffer = (char *) cmd->sense_buffer; 2294 cmd->request_bufflen = sizeof(cmd->sense_buffer); 2295 2296 local_irq_save(flags); 2297 LIST(cmd,hostdata->issue_queue); 2298 NEXT(cmd) = hostdata->issue_queue; 2299 hostdata->issue_queue = (Scsi_Cmnd *) cmd; 2300 local_irq_restore(flags); 2301 QU_PRINTK("scsi%d: REQUEST SENSE added to head of " 2302 "issue queue\n", H_NO(cmd)); 2303 } else 2304#endif /* def AUTOSENSE */ 2305 { 2306#ifdef NCR5380_STATS 2307 collect_stats(hostdata, cmd); 2308#endif 2309 cmd->scsi_done(cmd); 2310 } 2311 2312 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2313 /* 2314 * Restore phase bits to 0 so an interrupted selection, 2315 * arbitration can resume. 2316 */ 2317 NCR5380_write(TARGET_COMMAND_REG, 0); 2318 2319 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2320 barrier(); 2321 2322 falcon_dont_release--; 2323 /* ++roman: For Falcon SCSI, release the lock on the 2324 * ST-DMA here if no other commands are waiting on the 2325 * disconnected queue. 2326 */ 2327 falcon_release_lock_if_possible(hostdata); 2328 return; 2329 case MESSAGE_REJECT: 2330 /* Accept message by clearing ACK */ 2331 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2332 /* Enable reselect interrupts */ 2333 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2334 switch (hostdata->last_message) { 2335 case HEAD_OF_QUEUE_TAG: 2336 case ORDERED_QUEUE_TAG: 2337 case SIMPLE_QUEUE_TAG: 2338 /* The target obviously doesn't support tagged 2339 * queuing, even though it announced this ability in 2340 * its INQUIRY data ?!? (maybe only this LUN?) Ok, 2341 * clear 'tagged_supported' and lock the LUN, since 2342 * the command is treated as untagged further on. 2343 */ 2344 cmd->device->tagged_supported = 0; 2345 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 2346 cmd->tag = TAG_NONE; 2347 TAG_PRINTK("scsi%d: target %d lun %d rejected " 2348 "QUEUE_TAG message; tagged queuing " 2349 "disabled\n", 2350 HOSTNO, cmd->device->id, cmd->device->lun); 2351 break; 2352 } 2353 break; 2354 case DISCONNECT: 2355 /* Accept message by clearing ACK */ 2356 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2357 local_irq_save(flags); 2358 cmd->device->disconnect = 1; 2359 LIST(cmd,hostdata->disconnected_queue); 2360 NEXT(cmd) = hostdata->disconnected_queue; 2361 hostdata->connected = NULL; 2362 hostdata->disconnected_queue = cmd; 2363 local_irq_restore(flags); 2364 QU_PRINTK("scsi%d: command for target %d lun %d was " 2365 "moved from connected to the " 2366 "disconnected_queue\n", HOSTNO, 2367 cmd->device->id, cmd->device->lun); 2368 /* 2369 * Restore phase bits to 0 so an interrupted selection, 2370 * arbitration can resume. 2371 */ 2372 NCR5380_write(TARGET_COMMAND_REG, 0); 2373 2374 /* Enable reselect interrupts */ 2375 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2376 /* Wait for bus free to avoid nasty timeouts */ 2377 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) 2378 barrier(); 2379 return; 2380 /* 2381 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect 2382 * operation, in violation of the SCSI spec so we can safely 2383 * ignore SAVE/RESTORE pointers calls. 2384 * 2385 * Unfortunately, some disks violate the SCSI spec and 2386 * don't issue the required SAVE_POINTERS message before 2387 * disconnecting, and we have to break spec to remain 2388 * compatible. 2389 */ 2390 case SAVE_POINTERS: 2391 case RESTORE_POINTERS: 2392 /* Accept message by clearing ACK */ 2393 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2394 /* Enable reselect interrupts */ 2395 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2396 break; 2397 case EXTENDED_MESSAGE: 2398 /* 2399 * Extended messages are sent in the following format : 2400 * Byte 2401 * 0 EXTENDED_MESSAGE == 1 2402 * 1 length (includes one byte for code, doesn't 2403 * include first two bytes) 2404 * 2 code 2405 * 3..length+1 arguments 2406 * 2407 * Start the extended message buffer with the EXTENDED_MESSAGE 2408 * byte, since spi_print_msg() wants the whole thing. 2409 */ 2410 extended_msg[0] = EXTENDED_MESSAGE; 2411 /* Accept first byte by clearing ACK */ 2412 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2413 2414 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO); 2415 2416 len = 2; 2417 data = extended_msg + 1; 2418 phase = PHASE_MSGIN; 2419 NCR5380_transfer_pio(instance, &phase, &len, &data); 2420 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO, 2421 (int)extended_msg[1], (int)extended_msg[2]); 2422 2423 if (!len && extended_msg[1] <= 2424 (sizeof(extended_msg) - 1)) { 2425 /* Accept third byte by clearing ACK */ 2426 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2427 len = extended_msg[1] - 1; 2428 data = extended_msg + 3; 2429 phase = PHASE_MSGIN; 2430 2431 NCR5380_transfer_pio(instance, &phase, &len, &data); 2432 EXT_PRINTK("scsi%d: message received, residual %d\n", 2433 HOSTNO, len); 2434 2435 switch (extended_msg[2]) { 2436 case EXTENDED_SDTR: 2437 case EXTENDED_WDTR: 2438 case EXTENDED_MODIFY_DATA_POINTER: 2439 case EXTENDED_EXTENDED_IDENTIFY: 2440 tmp = 0; 2441 } 2442 } else if (len) { 2443 printk(KERN_NOTICE "scsi%d: error receiving " 2444 "extended message\n", HOSTNO); 2445 tmp = 0; 2446 } else { 2447 printk(KERN_NOTICE "scsi%d: extended message " 2448 "code %02x length %d is too long\n", 2449 HOSTNO, extended_msg[2], extended_msg[1]); 2450 tmp = 0; 2451 } 2452 /* Fall through to reject message */ 2453 2454 /* 2455 * If we get something weird that we aren't expecting, 2456 * reject it. 2457 */ 2458 default: 2459 if (!tmp) { 2460 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); 2461 spi_print_msg(extended_msg); 2462 printk("\n"); 2463 } else if (tmp != EXTENDED_MESSAGE) 2464 printk(KERN_DEBUG "scsi%d: rejecting unknown " 2465 "message %02x from target %d, lun %d\n", 2466 HOSTNO, tmp, cmd->device->id, cmd->device->lun); 2467 else 2468 printk(KERN_DEBUG "scsi%d: rejecting unknown " 2469 "extended message " 2470 "code %02x, length %d from target %d, lun %d\n", 2471 HOSTNO, extended_msg[1], extended_msg[0], 2472 cmd->device->id, cmd->device->lun); 2473 2474 2475 msgout = MESSAGE_REJECT; 2476 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); 2477 break; 2478 } /* switch (tmp) */ 2479 break; 2480 case PHASE_MSGOUT: 2481 len = 1; 2482 data = &msgout; 2483 hostdata->last_message = msgout; 2484 NCR5380_transfer_pio(instance, &phase, &len, &data); 2485 if (msgout == ABORT) { 2486#ifdef SUPPORT_TAGS 2487 cmd_free_tag(cmd); 2488#else 2489 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2490#endif 2491 hostdata->connected = NULL; 2492 cmd->result = DID_ERROR << 16; 2493#ifdef NCR5380_STATS 2494 collect_stats(hostdata, cmd); 2495#endif 2496 cmd->scsi_done(cmd); 2497 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); 2498 falcon_release_lock_if_possible(hostdata); 2499 return; 2500 } 2501 msgout = NOP; 2502 break; 2503 case PHASE_CMDOUT: 2504 len = cmd->cmd_len; 2505 data = cmd->cmnd; 2506 /* 2507 * XXX for performance reasons, on machines with a 2508 * PSEUDO-DMA architecture we should probably 2509 * use the dma transfer function. 2510 */ 2511 NCR5380_transfer_pio(instance, &phase, &len, &data); 2512 break; 2513 case PHASE_STATIN: 2514 len = 1; 2515 data = &tmp; 2516 NCR5380_transfer_pio(instance, &phase, &len, &data); 2517 cmd->SCp.Status = tmp; 2518 break; 2519 default: 2520 printk("scsi%d: unknown phase\n", HOSTNO); 2521 NCR_PRINT(NDEBUG_ANY); 2522 } /* switch(phase) */ 2523 } /* if (tmp * SR_REQ) */ 2524 } /* while (1) */ 2525} 2526 2527/* 2528 * Function : void NCR5380_reselect (struct Scsi_Host *instance) 2529 * 2530 * Purpose : does reselection, initializing the instance->connected 2531 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q 2532 * nexus has been reestablished, 2533 * 2534 * Inputs : instance - this instance of the NCR5380. 2535 * 2536 */ 2537 2538 2539static void NCR5380_reselect(struct Scsi_Host *instance) 2540{ 2541 SETUP_HOSTDATA(instance); 2542 unsigned char target_mask; 2543 unsigned char lun, phase; 2544 int len; 2545#ifdef SUPPORT_TAGS 2546 unsigned char tag; 2547#endif 2548 unsigned char msg[3]; 2549 unsigned char *data; 2550 Scsi_Cmnd *tmp = NULL, *prev; 2551/* unsigned long flags; */ 2552 2553 /* 2554 * Disable arbitration, etc. since the host adapter obviously 2555 * lost, and tell an interrupted NCR5380_select() to restart. 2556 */ 2557 2558 NCR5380_write(MODE_REG, MR_BASE); 2559 hostdata->restart_select = 1; 2560 2561 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); 2562 2563 RSL_PRINTK("scsi%d: reselect\n", HOSTNO); 2564 2565 /* 2566 * At this point, we have detected that our SCSI ID is on the bus, 2567 * SEL is true and BSY was false for at least one bus settle delay 2568 * (400 ns). 2569 * 2570 * We must assert BSY ourselves, until the target drops the SEL 2571 * signal. 2572 */ 2573 2574 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); 2575 2576 while (NCR5380_read(STATUS_REG) & SR_SEL) 2577 ; 2578 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2579 2580 /* 2581 * Wait for target to go into MSGIN. 2582 */ 2583 2584 while (!(NCR5380_read(STATUS_REG) & SR_REQ)) 2585 ; 2586 2587 len = 1; 2588 data = msg; 2589 phase = PHASE_MSGIN; 2590 NCR5380_transfer_pio(instance, &phase, &len, &data); 2591 2592 if (!(msg[0] & 0x80)) { 2593 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); 2594 spi_print_msg(msg); 2595 do_abort(instance); 2596 return; 2597 } 2598 lun = (msg[0] & 0x07); 2599 2600#ifdef SUPPORT_TAGS 2601 /* If the phase is still MSGIN, the target wants to send some more 2602 * messages. In case it supports tagged queuing, this is probably a 2603 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. 2604 */ 2605 tag = TAG_NONE; 2606 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { 2607 /* Accept previous IDENTIFY message by clearing ACK */ 2608 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2609 len = 2; 2610 data = msg + 1; 2611 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && 2612 msg[1] == SIMPLE_QUEUE_TAG) 2613 tag = msg[2]; 2614 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at " 2615 "reselection\n", HOSTNO, target_mask, lun, tag); 2616 } 2617#endif 2618 2619 /* 2620 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we 2621 * just reestablished, and remove it from the disconnected queue. 2622 */ 2623 2624 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; 2625 tmp; prev = tmp, tmp = NEXT(tmp)) { 2626 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) 2627#ifdef SUPPORT_TAGS 2628 && (tag == tmp->tag) 2629#endif 2630 ) { 2631 /* ++guenther: prevent race with falcon_release_lock */ 2632 falcon_dont_release++; 2633 if (prev) { 2634 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); 2635 NEXT(prev) = NEXT(tmp); 2636 } else { 2637 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); 2638 hostdata->disconnected_queue = NEXT(tmp); 2639 } 2640 NEXT(tmp) = NULL; 2641 break; 2642 } 2643 } 2644 2645 if (!tmp) { 2646 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " 2647#ifdef SUPPORT_TAGS 2648 "tag %d " 2649#endif 2650 "not in disconnected_queue.\n", 2651 HOSTNO, target_mask, lun 2652#ifdef SUPPORT_TAGS 2653 , tag 2654#endif 2655 ); 2656 /* 2657 * Since we have an established nexus that we can't do anything 2658 * with, we must abort it. 2659 */ 2660 do_abort(instance); 2661 return; 2662 } 2663 2664 /* Accept message by clearing ACK */ 2665 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2666 2667 hostdata->connected = tmp; 2668 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", 2669 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag); 2670 falcon_dont_release--; 2671} 2672 2673 2674/* 2675 * Function : int NCR5380_abort (Scsi_Cmnd *cmd) 2676 * 2677 * Purpose : abort a command 2678 * 2679 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the 2680 * host byte of the result field to, if zero DID_ABORTED is 2681 * used. 2682 * 2683 * Returns : 0 - success, -1 on failure. 2684 * 2685 * XXX - there is no way to abort the command that is currently 2686 * connected, you have to wait for it to complete. If this is 2687 * a problem, we could implement longjmp() / setjmp(), setjmp() 2688 * called where the loop started in NCR5380_main(). 2689 */ 2690 2691static 2692int NCR5380_abort(Scsi_Cmnd *cmd) 2693{ 2694 struct Scsi_Host *instance = cmd->device->host; 2695 SETUP_HOSTDATA(instance); 2696 Scsi_Cmnd *tmp, **prev; 2697 unsigned long flags; 2698 2699 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); 2700 scsi_print_command(cmd); 2701 2702 NCR5380_print_status(instance); 2703 2704 local_irq_save(flags); 2705 2706 if (!IS_A_TT() && !falcon_got_lock) 2707 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n", 2708 HOSTNO); 2709 2710 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, 2711 NCR5380_read(BUS_AND_STATUS_REG), 2712 NCR5380_read(STATUS_REG)); 2713 2714#if 1 2715 /* 2716 * Case 1 : If the command is the currently executing command, 2717 * we'll set the aborted flag and return control so that 2718 * information transfer routine can exit cleanly. 2719 */ 2720 2721 if (hostdata->connected == cmd) { 2722 2723 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO); 2724 /* 2725 * We should perform BSY checking, and make sure we haven't slipped 2726 * into BUS FREE. 2727 */ 2728 2729 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ 2730 /* 2731 * Since we can't change phases until we've completed the current 2732 * handshake, we have to source or sink a byte of data if the current 2733 * phase is not MSGOUT. 2734 */ 2735 2736 /* 2737 * Return control to the executing NCR drive so we can clear the 2738 * aborted flag and get back into our main loop. 2739 */ 2740 2741 if (do_abort(instance) == 0) { 2742 hostdata->aborted = 1; 2743 hostdata->connected = NULL; 2744 cmd->result = DID_ABORT << 16; 2745#ifdef SUPPORT_TAGS 2746 cmd_free_tag(cmd); 2747#else 2748 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2749#endif 2750 local_irq_restore(flags); 2751 cmd->scsi_done(cmd); 2752 falcon_release_lock_if_possible(hostdata); 2753 return SCSI_ABORT_SUCCESS; 2754 } else { 2755/* local_irq_restore(flags); */ 2756 printk("scsi%d: abort of connected command failed!\n", HOSTNO); 2757 return SCSI_ABORT_ERROR; 2758 } 2759 } 2760#endif 2761 2762 /* 2763 * Case 2 : If the command hasn't been issued yet, we simply remove it 2764 * from the issue queue. 2765 */ 2766 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue), 2767 tmp = (Scsi_Cmnd *)hostdata->issue_queue; 2768 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { 2769 if (cmd == tmp) { 2770 REMOVE(5, *prev, tmp, NEXT(tmp)); 2771 (*prev) = NEXT(tmp); 2772 NEXT(tmp) = NULL; 2773 tmp->result = DID_ABORT << 16; 2774 local_irq_restore(flags); 2775 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n", 2776 HOSTNO); 2777 /* Tagged queuing note: no tag to free here, hasn't been assigned 2778 * yet... */ 2779 tmp->scsi_done(tmp); 2780 falcon_release_lock_if_possible(hostdata); 2781 return SCSI_ABORT_SUCCESS; 2782 } 2783 } 2784 2785 /* 2786 * Case 3 : If any commands are connected, we're going to fail the abort 2787 * and let the high level SCSI driver retry at a later time or 2788 * issue a reset. 2789 * 2790 * Timeouts, and therefore aborted commands, will be highly unlikely 2791 * and handling them cleanly in this situation would make the common 2792 * case of noresets less efficient, and would pollute our code. So, 2793 * we fail. 2794 */ 2795 2796 if (hostdata->connected) { 2797 local_irq_restore(flags); 2798 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO); 2799 return SCSI_ABORT_SNOOZE; 2800 } 2801 2802 /* 2803 * Case 4: If the command is currently disconnected from the bus, and 2804 * there are no connected commands, we reconnect the I_T_L or 2805 * I_T_L_Q nexus associated with it, go into message out, and send 2806 * an abort message. 2807 * 2808 * This case is especially ugly. In order to reestablish the nexus, we 2809 * need to call NCR5380_select(). The easiest way to implement this 2810 * function was to abort if the bus was busy, and let the interrupt 2811 * handler triggered on the SEL for reselect take care of lost arbitrations 2812 * where necessary, meaning interrupts need to be enabled. 2813 * 2814 * When interrupts are enabled, the queues may change - so we 2815 * can't remove it from the disconnected queue before selecting it 2816 * because that could cause a failure in hashing the nexus if that 2817 * device reselected. 2818 * 2819 * Since the queues may change, we can't use the pointers from when we 2820 * first locate it. 2821 * 2822 * So, we must first locate the command, and if NCR5380_select() 2823 * succeeds, then issue the abort, relocate the command and remove 2824 * it from the disconnected queue. 2825 */ 2826 2827 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; 2828 tmp = NEXT(tmp)) { 2829 if (cmd == tmp) { 2830 local_irq_restore(flags); 2831 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO); 2832 2833 if (NCR5380_select(instance, cmd, (int)cmd->tag)) 2834 return SCSI_ABORT_BUSY; 2835 2836 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO); 2837 2838 do_abort(instance); 2839 2840 local_irq_save(flags); 2841 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue), 2842 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue; 2843 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) { 2844 if (cmd == tmp) { 2845 REMOVE(5, *prev, tmp, NEXT(tmp)); 2846 *prev = NEXT(tmp); 2847 NEXT(tmp) = NULL; 2848 tmp->result = DID_ABORT << 16; 2849 /* We must unlock the tag/LUN immediately here, since the 2850 * target goes to BUS FREE and doesn't send us another 2851 * message (COMMAND_COMPLETE or the like) 2852 */ 2853#ifdef SUPPORT_TAGS 2854 cmd_free_tag(tmp); 2855#else 2856 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 2857#endif 2858 local_irq_restore(flags); 2859 tmp->scsi_done(tmp); 2860 falcon_release_lock_if_possible(hostdata); 2861 return SCSI_ABORT_SUCCESS; 2862 } 2863 } 2864 } 2865 } 2866 2867 /* 2868 * Case 5 : If we reached this point, the command was not found in any of 2869 * the queues. 2870 * 2871 * We probably reached this point because of an unlikely race condition 2872 * between the command completing successfully and the abortion code, 2873 * so we won't panic, but we will notify the user in case something really 2874 * broke. 2875 */ 2876 2877 local_irq_restore(flags); 2878 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n" 2879 KERN_INFO " before abortion\n", HOSTNO); 2880 2881 /* Maybe it is sufficient just to release the ST-DMA lock... (if 2882 * possible at all) At least, we should check if the lock could be 2883 * released after the abort, in case it is kept due to some bug. 2884 */ 2885 falcon_release_lock_if_possible(hostdata); 2886 2887 return SCSI_ABORT_NOT_RUNNING; 2888} 2889 2890 2891/* 2892 * Function : int NCR5380_reset (Scsi_Cmnd *cmd) 2893 * 2894 * Purpose : reset the SCSI bus. 2895 * 2896 * Returns : SCSI_RESET_WAKEUP 2897 * 2898 */ 2899 2900static int NCR5380_bus_reset(Scsi_Cmnd *cmd) 2901{ 2902 SETUP_HOSTDATA(cmd->device->host); 2903 int i; 2904 unsigned long flags; 2905#if 1 2906 Scsi_Cmnd *connected, *disconnected_queue; 2907#endif 2908 2909 if (!IS_A_TT() && !falcon_got_lock) 2910 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n", 2911 H_NO(cmd)); 2912 2913 NCR5380_print_status(cmd->device->host); 2914 2915 /* get in phase */ 2916 NCR5380_write(TARGET_COMMAND_REG, 2917 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG))); 2918 /* assert RST */ 2919 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); 2920 udelay(40); 2921 /* reset NCR registers */ 2922 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); 2923 NCR5380_write(MODE_REG, MR_BASE); 2924 NCR5380_write(TARGET_COMMAND_REG, 0); 2925 NCR5380_write(SELECT_ENABLE_REG, 0); 2926 /* ++roman: reset interrupt condition! otherwise no interrupts don't get 2927 * through anymore ... */ 2928 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); 2929 2930#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */ 2931 /* XXX see below XXX */ 2932 2933 /* MSch: old-style reset: actually abort all command processing here */ 2934 2935 /* After the reset, there are no more connected or disconnected commands 2936 * and no busy units; to avoid problems with re-inserting the commands 2937 * into the issue_queue (via scsi_done()), the aborted commands are 2938 * remembered in local variables first. 2939 */ 2940 local_irq_save(flags); 2941 connected = (Scsi_Cmnd *)hostdata->connected; 2942 hostdata->connected = NULL; 2943 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue; 2944 hostdata->disconnected_queue = NULL; 2945#ifdef SUPPORT_TAGS 2946 free_all_tags(); 2947#endif 2948 for (i = 0; i < 8; ++i) 2949 hostdata->busy[i] = 0; 2950#ifdef REAL_DMA 2951 hostdata->dma_len = 0; 2952#endif 2953 local_irq_restore(flags); 2954 2955 /* In order to tell the mid-level code which commands were aborted, 2956 * set the command status to DID_RESET and call scsi_done() !!! 2957 * This ultimately aborts processing of these commands in the mid-level. 2958 */ 2959 2960 if ((cmd = connected)) { 2961 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); 2962 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); 2963 cmd->scsi_done(cmd); 2964 } 2965 2966 for (i = 0; (cmd = disconnected_queue); ++i) { 2967 disconnected_queue = NEXT(cmd); 2968 NEXT(cmd) = NULL; 2969 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); 2970 cmd->scsi_done(cmd); 2971 } 2972 if (i > 0) 2973 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i); 2974 2975 /* The Falcon lock should be released after a reset... 2976 */ 2977 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between 2978 * unlocking and enabling dma interrupt. 2979 */ 2980/* falcon_release_lock_if_possible( hostdata );*/ 2981 2982 /* since all commands have been explicitly terminated, we need to tell 2983 * the midlevel code that the reset was SUCCESSFUL, and there is no 2984 * need to 'wake up' the commands by a request_sense 2985 */ 2986 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET; 2987#else /* 1 */ 2988 2989 /* MSch: new-style reset handling: let the mid-level do what it can */ 2990 2991 /* ++guenther: MID-LEVEL IS STILL BROKEN. 2992 * Mid-level is supposed to requeue all commands that were active on the 2993 * various low-level queues. In fact it does this, but that's not enough 2994 * because all these commands are subject to timeout. And if a timeout 2995 * happens for any removed command, *_abort() is called but all queues 2996 * are now empty. Abort then gives up the falcon lock, which is fatal, 2997 * since the mid-level will queue more commands and must have the lock 2998 * (it's all happening inside timer interrupt handler!!). 2999 * Even worse, abort will return NOT_RUNNING for all those commands not 3000 * on any queue, so they won't be retried ... 3001 * 3002 * Conclusion: either scsi.c disables timeout for all resetted commands 3003 * immediately, or we lose! As of linux-2.0.20 it doesn't. 3004 */ 3005 3006 /* After the reset, there are no more connected or disconnected commands 3007 * and no busy units; so clear the low-level status here to avoid 3008 * conflicts when the mid-level code tries to wake up the affected 3009 * commands! 3010 */ 3011 3012 if (hostdata->issue_queue) 3013 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); 3014 if (hostdata->connected) 3015 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); 3016 if (hostdata->disconnected_queue) 3017 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); 3018 3019 local_irq_save(flags); 3020 hostdata->issue_queue = NULL; 3021 hostdata->connected = NULL; 3022 hostdata->disconnected_queue = NULL; 3023#ifdef SUPPORT_TAGS 3024 free_all_tags(); 3025#endif 3026 for (i = 0; i < 8; ++i) 3027 hostdata->busy[i] = 0; 3028#ifdef REAL_DMA 3029 hostdata->dma_len = 0; 3030#endif 3031 local_irq_restore(flags); 3032 3033 /* we did no complete reset of all commands, so a wakeup is required */ 3034 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET; 3035#endif /* 1 */ 3036} 3037