1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/acorn/scsi/fas216.c 4 * 5 * Copyright (C) 1997-2003 Russell King 6 * 7 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and 8 * other sources, including: 9 * the AMD Am53CF94 data sheet 10 * the AMD Am53C94 data sheet 11 * 12 * This is a generic driver. To use it, have a look at cumana_2.c. You 13 * should define your own structure that overlays FAS216_Info, eg: 14 * struct my_host_data { 15 * FAS216_Info info; 16 * ... my host specific data ... 17 * }; 18 * 19 * Changelog: 20 * 30-08-1997 RMK Created 21 * 14-09-1997 RMK Started disconnect support 22 * 08-02-1998 RMK Corrected real DMA support 23 * 15-02-1998 RMK Started sync xfer support 24 * 06-04-1998 RMK Tightened conditions for printing incomplete 25 * transfers 26 * 02-05-1998 RMK Added extra checks in fas216_reset 27 * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns 28 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h 29 * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT 30 * 02-04-2000 RMK Converted to use the new error handling, and 31 * automatically request sense data upon check 32 * condition status from targets. 33 */ 34 #include <linux/module.h> 35 #include <linux/blkdev.h> 36 #include <linux/kernel.h> 37 #include <linux/string.h> 38 #include <linux/ioport.h> 39 #include <linux/proc_fs.h> 40 #include <linux/delay.h> 41 #include <linux/bitops.h> 42 #include <linux/init.h> 43 #include <linux/interrupt.h> 44 45 #include <asm/dma.h> 46 #include <asm/io.h> 47 #include <asm/irq.h> 48 #include <asm/ecard.h> 49 50 #include "../scsi.h" 51 #include <scsi/scsi_dbg.h> 52 #include <scsi/scsi_host.h> 53 #include "fas216.h" 54 #include "scsi.h" 55 56 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to 57 * the data sheet. This restriction is crazy, especially when 58 * you only want to send 16 bytes! What were the guys who 59 * designed this chip on at that time? Did they read the SCSI2 60 * spec at all? The following sections are taken from the SCSI2 61 * standard (s2r10) concerning this: 62 * 63 * > IMPLEMENTORS NOTES: 64 * > (1) Re-negotiation at every selection is not recommended, since a 65 * > significant performance impact is likely. 66 * 67 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE 68 * > RESET message is received, until a hard reset condition occurs, or until one 69 * > of the two SCSI devices elects to modify the agreement. The default data 70 * > transfer mode is asynchronous data transfer mode. The default data transfer 71 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard 72 * > reset condition. 73 * 74 * In total, this means that once you have elected to use synchronous 75 * transfers, you must always use DMA. 76 * 77 * I was thinking that this was a good chip until I found this restriction ;( 78 */ 79 #define SCSI2_SYNC 80 #undef SCSI2_TAG 81 82 #undef DEBUG_CONNECT 83 #undef DEBUG_MESSAGES 84 85 #undef CHECK_STRUCTURE 86 87 #define LOG_CONNECT (1 << 0) 88 #define LOG_BUSSERVICE (1 << 1) 89 #define LOG_FUNCTIONDONE (1 << 2) 90 #define LOG_MESSAGES (1 << 3) 91 #define LOG_BUFFER (1 << 4) 92 #define LOG_ERROR (1 << 8) 93 94 static int level_mask = LOG_ERROR; 95 96 module_param(level_mask, int, 0644); 97 98 #ifndef MODULE 99 static int __init fas216_log_setup(char *str) 100 { 101 char *s; 102 103 level_mask = 0; 104 105 while ((s = strsep(&str, ",")) != NULL) { 106 switch (s[0]) { 107 case 'a': 108 if (strcmp(s, "all") == 0) 109 level_mask |= -1; 110 break; 111 case 'b': 112 if (strncmp(s, "bus", 3) == 0) 113 level_mask |= LOG_BUSSERVICE; 114 if (strncmp(s, "buf", 3) == 0) 115 level_mask |= LOG_BUFFER; 116 break; 117 case 'c': 118 level_mask |= LOG_CONNECT; 119 break; 120 case 'e': 121 level_mask |= LOG_ERROR; 122 break; 123 case 'm': 124 level_mask |= LOG_MESSAGES; 125 break; 126 case 'n': 127 if (strcmp(s, "none") == 0) 128 level_mask = 0; 129 break; 130 case 's': 131 level_mask |= LOG_FUNCTIONDONE; 132 break; 133 } 134 } 135 return 1; 136 } 137 138 __setup("fas216_logging=", fas216_log_setup); 139 #endif 140 141 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg) 142 { 143 unsigned int off = reg << info->scsi.io_shift; 144 return readb(info->scsi.io_base + off); 145 } 146 147 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val) 148 { 149 unsigned int off = reg << info->scsi.io_shift; 150 writeb(val, info->scsi.io_base + off); 151 } 152 153 static void fas216_dumpstate(FAS216_Info *info) 154 { 155 unsigned char is, stat, inst; 156 157 is = fas216_readb(info, REG_IS); 158 stat = fas216_readb(info, REG_STAT); 159 inst = fas216_readb(info, REG_INST); 160 161 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X" 162 " INST=%02X IS=%02X CFIS=%02X", 163 fas216_readb(info, REG_CTCL), 164 fas216_readb(info, REG_CTCM), 165 fas216_readb(info, REG_CMD), stat, inst, is, 166 fas216_readb(info, REG_CFIS)); 167 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n", 168 fas216_readb(info, REG_CNTL1), 169 fas216_readb(info, REG_CNTL2), 170 fas216_readb(info, REG_CNTL3), 171 fas216_readb(info, REG_CTCH)); 172 } 173 174 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix) 175 { 176 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s", 177 prefix, SCp->ptr, SCp->this_residual, SCp->buffer, 178 SCp->buffers_residual, suffix); 179 } 180 181 #ifdef CHECK_STRUCTURE 182 static void fas216_dumpinfo(FAS216_Info *info) 183 { 184 static int used = 0; 185 int i; 186 187 if (used++) 188 return; 189 190 printk("FAS216_Info=\n"); 191 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n", 192 info->magic_start, info->host, info->SCpnt, 193 info->origSCpnt); 194 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n", 195 info->scsi.io_shift, info->scsi.irq, 196 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2], 197 info->scsi.cfg[3]); 198 printk(" type=%p phase=%X\n", 199 info->scsi.type, info->scsi.phase); 200 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n"); 201 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n", 202 info->scsi.async_stp, 203 info->scsi.disconnectable, info->scsi.aborting); 204 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n" 205 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n", 206 info->stats.queues, info->stats.removes, info->stats.fins, 207 info->stats.reads, info->stats.writes, info->stats.miscs, 208 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets, 209 info->stats.host_resets); 210 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n", 211 info->ifcfg.clockrate, info->ifcfg.select_timeout, 212 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth); 213 for (i = 0; i < 8; i++) { 214 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n", 215 i, info->busyluns[i], i, 216 info->device[i].disconnect_ok, info->device[i].stp, 217 info->device[i].sof, info->device[i].sync_state); 218 } 219 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n", 220 info->dma.transfer_type, info->dma.setup, 221 info->dma.pseudo, info->dma.stop); 222 printk(" internal_done=%X magic_end=%lX }\n", 223 info->internal_done, info->magic_end); 224 } 225 226 static void __fas216_checkmagic(FAS216_Info *info, const char *func) 227 { 228 int corruption = 0; 229 if (info->magic_start != MAGIC) { 230 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n"); 231 corruption++; 232 } 233 if (info->magic_end != MAGIC) { 234 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n"); 235 corruption++; 236 } 237 if (corruption) { 238 fas216_dumpinfo(info); 239 panic("scsi memory space corrupted in %s", func); 240 } 241 } 242 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__) 243 #else 244 #define fas216_checkmagic(info) 245 #endif 246 247 static const char *fas216_bus_phase(int stat) 248 { 249 static const char *phases[] = { 250 "DATA OUT", "DATA IN", 251 "COMMAND", "STATUS", 252 "MISC OUT", "MISC IN", 253 "MESG OUT", "MESG IN" 254 }; 255 256 return phases[stat & STAT_BUSMASK]; 257 } 258 259 static const char *fas216_drv_phase(FAS216_Info *info) 260 { 261 static const char *phases[] = { 262 [PHASE_IDLE] = "idle", 263 [PHASE_SELECTION] = "selection", 264 [PHASE_COMMAND] = "command", 265 [PHASE_DATAOUT] = "data out", 266 [PHASE_DATAIN] = "data in", 267 [PHASE_MSGIN] = "message in", 268 [PHASE_MSGIN_DISCONNECT]= "disconnect", 269 [PHASE_MSGOUT_EXPECT] = "expect message out", 270 [PHASE_MSGOUT] = "message out", 271 [PHASE_STATUS] = "status", 272 [PHASE_DONE] = "done", 273 }; 274 275 if (info->scsi.phase < ARRAY_SIZE(phases) && 276 phases[info->scsi.phase]) 277 return phases[info->scsi.phase]; 278 return "???"; 279 } 280 281 static char fas216_target(FAS216_Info *info) 282 { 283 if (info->SCpnt) 284 return '0' + info->SCpnt->device->id; 285 else 286 return 'H'; 287 } 288 289 static void 290 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap) 291 { 292 static char buf[1024]; 293 294 vsnprintf(buf, sizeof(buf), fmt, ap); 295 printk("scsi%d.%c: %s", info->host->host_no, target, buf); 296 } 297 298 static void fas216_log_command(FAS216_Info *info, int level, 299 struct scsi_cmnd *SCpnt, char *fmt, ...) 300 { 301 va_list args; 302 303 if (level != 0 && !(level & level_mask)) 304 return; 305 306 va_start(args, fmt); 307 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args); 308 va_end(args); 309 310 scsi_print_command(SCpnt); 311 } 312 313 static void 314 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...) 315 { 316 va_list args; 317 318 if (level != 0 && !(level & level_mask)) 319 return; 320 321 if (target < 0) 322 target = 'H'; 323 else 324 target += '0'; 325 326 va_start(args, fmt); 327 fas216_do_log(info, target, fmt, args); 328 va_end(args); 329 330 printk("\n"); 331 } 332 333 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...) 334 { 335 va_list args; 336 337 if (level != 0 && !(level & level_mask)) 338 return; 339 340 va_start(args, fmt); 341 fas216_do_log(info, fas216_target(info), fmt, args); 342 va_end(args); 343 344 printk("\n"); 345 } 346 347 #define PH_SIZE 32 348 349 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE]; 350 static int ph_ptr; 351 352 static void add_debug_list(int stat, int ssr, int isr, int ph) 353 { 354 ph_list[ph_ptr].stat = stat; 355 ph_list[ph_ptr].ssr = ssr; 356 ph_list[ph_ptr].isr = isr; 357 ph_list[ph_ptr].ph = ph; 358 359 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1); 360 } 361 362 static struct { int command; void *from; } cmd_list[8]; 363 static int cmd_ptr; 364 365 static void fas216_cmd(FAS216_Info *info, unsigned int command) 366 { 367 cmd_list[cmd_ptr].command = command; 368 cmd_list[cmd_ptr].from = __builtin_return_address(0); 369 370 cmd_ptr = (cmd_ptr + 1) & 7; 371 372 fas216_writeb(info, REG_CMD, command); 373 } 374 375 static void print_debug_list(void) 376 { 377 int i; 378 379 i = ph_ptr; 380 381 printk(KERN_ERR "SCSI IRQ trail\n"); 382 do { 383 printk(" %02x:%02x:%02x:%1x", 384 ph_list[i].stat, ph_list[i].ssr, 385 ph_list[i].isr, ph_list[i].ph); 386 i = (i + 1) & (PH_SIZE - 1); 387 if (((i ^ ph_ptr) & 7) == 0) 388 printk("\n"); 389 } while (i != ph_ptr); 390 if ((i ^ ph_ptr) & 7) 391 printk("\n"); 392 393 i = cmd_ptr; 394 printk(KERN_ERR "FAS216 commands: "); 395 do { 396 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from); 397 i = (i + 1) & 7; 398 } while (i != cmd_ptr); 399 printk("\n"); 400 } 401 402 static void fas216_done(FAS216_Info *info, unsigned int result); 403 404 /** 405 * fas216_get_last_msg - retrive last message from the list 406 * @info: interface to search 407 * @pos: current fifo position 408 * 409 * Retrieve a last message from the list, using position in fifo. 410 */ 411 static inline unsigned short 412 fas216_get_last_msg(FAS216_Info *info, int pos) 413 { 414 unsigned short packed_msg = NOP; 415 struct message *msg; 416 int msgnr = 0; 417 418 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 419 if (pos >= msg->fifo) 420 break; 421 } 422 423 if (msg) { 424 if (msg->msg[0] == EXTENDED_MESSAGE) 425 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8; 426 else 427 packed_msg = msg->msg[0]; 428 } 429 430 fas216_log(info, LOG_MESSAGES, 431 "Message: %04x found at position %02x\n", packed_msg, pos); 432 433 return packed_msg; 434 } 435 436 /** 437 * fas216_syncperiod - calculate STP register value 438 * @info: state structure for interface connected to device 439 * @ns: period in ns (between subsequent bytes) 440 * 441 * Calculate value to be loaded into the STP register for a given period 442 * in ns. Returns a value suitable for REG_STP. 443 */ 444 static int fas216_syncperiod(FAS216_Info *info, int ns) 445 { 446 int value = (info->ifcfg.clockrate * ns) / 1000; 447 448 fas216_checkmagic(info); 449 450 if (value < 4) 451 value = 4; 452 else if (value > 35) 453 value = 35; 454 455 return value & 31; 456 } 457 458 /** 459 * fas216_set_sync - setup FAS216 chip for specified transfer period. 460 * @info: state structure for interface connected to device 461 * @target: target 462 * 463 * Correctly setup FAS216 chip for specified transfer period. 464 * Notes : we need to switch the chip out of FASTSCSI mode if we have 465 * a transfer period >= 200ns - otherwise the chip will violate 466 * the SCSI timings. 467 */ 468 static void fas216_set_sync(FAS216_Info *info, int target) 469 { 470 unsigned int cntl3; 471 472 fas216_writeb(info, REG_SOF, info->device[target].sof); 473 fas216_writeb(info, REG_STP, info->device[target].stp); 474 475 cntl3 = info->scsi.cfg[2]; 476 if (info->device[target].period >= (200 / 4)) 477 cntl3 = cntl3 & ~CNTL3_FASTSCSI; 478 479 fas216_writeb(info, REG_CNTL3, cntl3); 480 } 481 482 /* Synchronous transfer support 483 * 484 * Note: The SCSI II r10 spec says (5.6.12): 485 * 486 * (2) Due to historical problems with early host adapters that could 487 * not accept an SDTR message, some targets may not initiate synchronous 488 * negotiation after a power cycle as required by this standard. Host 489 * adapters that support synchronous mode may avoid the ensuing failure 490 * modes when the target is independently power cycled by initiating a 491 * synchronous negotiation on each REQUEST SENSE and INQUIRY command. 492 * This approach increases the SCSI bus overhead and is not recommended 493 * for new implementations. The correct method is to respond to an 494 * SDTR message with a MESSAGE REJECT message if the either the 495 * initiator or target devices does not support synchronous transfers 496 * or does not want to negotiate for synchronous transfers at the time. 497 * Using the correct method assures compatibility with wide data 498 * transfers and future enhancements. 499 * 500 * We will always initiate a synchronous transfer negotiation request on 501 * every INQUIRY or REQUEST SENSE message, unless the target itself has 502 * at some point performed a synchronous transfer negotiation request, or 503 * we have synchronous transfers disabled for this device. 504 */ 505 506 /** 507 * fas216_handlesync - Handle a synchronous transfer message 508 * @info: state structure for interface 509 * @msg: message from target 510 * 511 * Handle a synchronous transfer message from the target 512 */ 513 static void fas216_handlesync(FAS216_Info *info, char *msg) 514 { 515 struct fas216_device *dev = &info->device[info->SCpnt->device->id]; 516 enum { sync, async, none, reject } res = none; 517 518 #ifdef SCSI2_SYNC 519 switch (msg[0]) { 520 case MESSAGE_REJECT: 521 /* Synchronous transfer request failed. 522 * Note: SCSI II r10: 523 * 524 * SCSI devices that are capable of synchronous 525 * data transfers shall not respond to an SDTR 526 * message with a MESSAGE REJECT message. 527 * 528 * Hence, if we get this condition, we disable 529 * negotiation for this device. 530 */ 531 if (dev->sync_state == neg_inprogress) { 532 dev->sync_state = neg_invalid; 533 res = async; 534 } 535 break; 536 537 case EXTENDED_MESSAGE: 538 switch (dev->sync_state) { 539 /* We don't accept synchronous transfer requests. 540 * Respond with a MESSAGE_REJECT to prevent a 541 * synchronous transfer agreement from being reached. 542 */ 543 case neg_invalid: 544 res = reject; 545 break; 546 547 /* We were not negotiating a synchronous transfer, 548 * but the device sent us a negotiation request. 549 * Honour the request by sending back a SDTR 550 * message containing our capability, limited by 551 * the targets capability. 552 */ 553 default: 554 fas216_cmd(info, CMD_SETATN); 555 if (msg[4] > info->ifcfg.sync_max_depth) 556 msg[4] = info->ifcfg.sync_max_depth; 557 if (msg[3] < 1000 / info->ifcfg.clockrate) 558 msg[3] = 1000 / info->ifcfg.clockrate; 559 560 msgqueue_flush(&info->scsi.msgs); 561 msgqueue_addmsg(&info->scsi.msgs, 5, 562 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 563 msg[3], msg[4]); 564 info->scsi.phase = PHASE_MSGOUT_EXPECT; 565 566 /* This is wrong. The agreement is not in effect 567 * until this message is accepted by the device 568 */ 569 dev->sync_state = neg_targcomplete; 570 res = sync; 571 break; 572 573 /* We initiated the synchronous transfer negotiation, 574 * and have successfully received a response from the 575 * target. The synchronous transfer agreement has been 576 * reached. Note: if the values returned are out of our 577 * bounds, we must reject the message. 578 */ 579 case neg_inprogress: 580 res = reject; 581 if (msg[4] <= info->ifcfg.sync_max_depth && 582 msg[3] >= 1000 / info->ifcfg.clockrate) { 583 dev->sync_state = neg_complete; 584 res = sync; 585 } 586 break; 587 } 588 } 589 #else 590 res = reject; 591 #endif 592 593 switch (res) { 594 case sync: 595 dev->period = msg[3]; 596 dev->sof = msg[4]; 597 dev->stp = fas216_syncperiod(info, msg[3] * 4); 598 fas216_set_sync(info, info->SCpnt->device->id); 599 break; 600 601 case reject: 602 fas216_cmd(info, CMD_SETATN); 603 msgqueue_flush(&info->scsi.msgs); 604 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 605 info->scsi.phase = PHASE_MSGOUT_EXPECT; 606 fallthrough; 607 608 case async: 609 dev->period = info->ifcfg.asyncperiod / 4; 610 dev->sof = 0; 611 dev->stp = info->scsi.async_stp; 612 fas216_set_sync(info, info->SCpnt->device->id); 613 break; 614 615 case none: 616 break; 617 } 618 } 619 620 /** 621 * fas216_updateptrs - update data pointers after transfer suspended/paused 622 * @info: interface's local pointer to update 623 * @bytes_transferred: number of bytes transferred 624 * 625 * Update data pointers after transfer suspended/paused 626 */ 627 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred) 628 { 629 struct scsi_pointer *SCp = &info->scsi.SCp; 630 631 fas216_checkmagic(info); 632 633 BUG_ON(bytes_transferred < 0); 634 635 SCp->phase -= bytes_transferred; 636 637 while (bytes_transferred != 0) { 638 if (SCp->this_residual > bytes_transferred) 639 break; 640 /* 641 * We have used up this buffer. Move on to the 642 * next buffer. 643 */ 644 bytes_transferred -= SCp->this_residual; 645 if (!next_SCp(SCp) && bytes_transferred) { 646 printk(KERN_WARNING "scsi%d.%c: out of buffers\n", 647 info->host->host_no, '0' + info->SCpnt->device->id); 648 return; 649 } 650 } 651 652 SCp->this_residual -= bytes_transferred; 653 if (SCp->this_residual) 654 SCp->ptr += bytes_transferred; 655 else 656 SCp->ptr = NULL; 657 } 658 659 /** 660 * fas216_pio - transfer data off of/on to card using programmed IO 661 * @info: interface to transfer data to/from 662 * @direction: direction to transfer data (DMA_OUT/DMA_IN) 663 * 664 * Transfer data off of/on to card using programmed IO. 665 * Notes: this is incredibly slow. 666 */ 667 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction) 668 { 669 struct scsi_pointer *SCp = &info->scsi.SCp; 670 671 fas216_checkmagic(info); 672 673 if (direction == DMA_OUT) 674 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp)); 675 else 676 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF)); 677 678 if (SCp->this_residual == 0) 679 next_SCp(SCp); 680 } 681 682 static void fas216_set_stc(FAS216_Info *info, unsigned int length) 683 { 684 fas216_writeb(info, REG_STCL, length); 685 fas216_writeb(info, REG_STCM, length >> 8); 686 fas216_writeb(info, REG_STCH, length >> 16); 687 } 688 689 static unsigned int fas216_get_ctc(FAS216_Info *info) 690 { 691 return fas216_readb(info, REG_CTCL) + 692 (fas216_readb(info, REG_CTCM) << 8) + 693 (fas216_readb(info, REG_CTCH) << 16); 694 } 695 696 /** 697 * fas216_cleanuptransfer - clean up after a transfer has completed. 698 * @info: interface to clean up 699 * 700 * Update the data pointers according to the number of bytes transferred 701 * on the SCSI bus. 702 */ 703 static void fas216_cleanuptransfer(FAS216_Info *info) 704 { 705 unsigned long total, residual, fifo; 706 fasdmatype_t dmatype = info->dma.transfer_type; 707 708 info->dma.transfer_type = fasdma_none; 709 710 /* 711 * PIO transfers do not need to be cleaned up. 712 */ 713 if (dmatype == fasdma_pio || dmatype == fasdma_none) 714 return; 715 716 if (dmatype == fasdma_real_all) 717 total = info->scsi.SCp.phase; 718 else 719 total = info->scsi.SCp.this_residual; 720 721 residual = fas216_get_ctc(info); 722 723 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 724 725 fas216_log(info, LOG_BUFFER, "cleaning up from previous " 726 "transfer: length 0x%06x, residual 0x%x, fifo %d", 727 total, residual, fifo); 728 729 /* 730 * If we were performing Data-Out, the transfer counter 731 * counts down each time a byte is transferred by the 732 * host to the FIFO. This means we must include the 733 * bytes left in the FIFO from the transfer counter. 734 */ 735 if (info->scsi.phase == PHASE_DATAOUT) 736 residual += fifo; 737 738 fas216_updateptrs(info, total - residual); 739 } 740 741 /** 742 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card 743 * @info: interface from which device disconnected from 744 * 745 * Start a DMA/PIO transfer off of/on to card 746 */ 747 static void fas216_transfer(FAS216_Info *info) 748 { 749 fasdmadir_t direction; 750 fasdmatype_t dmatype; 751 752 fas216_log(info, LOG_BUFFER, 753 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x", 754 info->scsi.SCp.ptr, info->scsi.SCp.this_residual, 755 info->scsi.SCp.phase); 756 757 if (!info->scsi.SCp.ptr) { 758 fas216_log(info, LOG_ERROR, "null buffer passed to " 759 "fas216_starttransfer"); 760 print_SCp(&info->scsi.SCp, "SCp: ", "\n"); 761 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n"); 762 return; 763 } 764 765 /* 766 * If we have a synchronous transfer agreement in effect, we must 767 * use DMA mode. If we are using asynchronous transfers, we may 768 * use DMA mode or PIO mode. 769 */ 770 if (info->device[info->SCpnt->device->id].sof) 771 dmatype = fasdma_real_all; 772 else 773 dmatype = fasdma_pio; 774 775 if (info->scsi.phase == PHASE_DATAOUT) 776 direction = DMA_OUT; 777 else 778 direction = DMA_IN; 779 780 if (info->dma.setup) 781 dmatype = info->dma.setup(info->host, &info->scsi.SCp, 782 direction, dmatype); 783 info->dma.transfer_type = dmatype; 784 785 if (dmatype == fasdma_real_all) 786 fas216_set_stc(info, info->scsi.SCp.phase); 787 else 788 fas216_set_stc(info, info->scsi.SCp.this_residual); 789 790 switch (dmatype) { 791 case fasdma_pio: 792 fas216_log(info, LOG_BUFFER, "PIO transfer"); 793 fas216_writeb(info, REG_SOF, 0); 794 fas216_writeb(info, REG_STP, info->scsi.async_stp); 795 fas216_cmd(info, CMD_TRANSFERINFO); 796 fas216_pio(info, direction); 797 break; 798 799 case fasdma_pseudo: 800 fas216_log(info, LOG_BUFFER, "pseudo transfer"); 801 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 802 info->dma.pseudo(info->host, &info->scsi.SCp, 803 direction, info->SCpnt->transfersize); 804 break; 805 806 case fasdma_real_block: 807 fas216_log(info, LOG_BUFFER, "block dma transfer"); 808 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 809 break; 810 811 case fasdma_real_all: 812 fas216_log(info, LOG_BUFFER, "total dma transfer"); 813 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 814 break; 815 816 default: 817 fas216_log(info, LOG_BUFFER | LOG_ERROR, 818 "invalid FAS216 DMA type"); 819 break; 820 } 821 } 822 823 /** 824 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card 825 * @info: interface from which device disconnected from 826 * 827 * Called when we switch away from DATA IN or DATA OUT phases. 828 */ 829 static void fas216_stoptransfer(FAS216_Info *info) 830 { 831 fas216_checkmagic(info); 832 833 if (info->dma.transfer_type == fasdma_real_all || 834 info->dma.transfer_type == fasdma_real_block) 835 info->dma.stop(info->host, &info->scsi.SCp); 836 837 fas216_cleanuptransfer(info); 838 839 if (info->scsi.phase == PHASE_DATAIN) { 840 unsigned int fifo; 841 842 /* 843 * If we were performing Data-In, then the FIFO counter 844 * contains the number of bytes not transferred via DMA 845 * from the on-board FIFO. Read them manually. 846 */ 847 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 848 while (fifo && info->scsi.SCp.ptr) { 849 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF); 850 fas216_updateptrs(info, 1); 851 fifo--; 852 } 853 } else { 854 /* 855 * After a Data-Out phase, there may be unsent 856 * bytes left in the FIFO. Flush them out. 857 */ 858 fas216_cmd(info, CMD_FLUSHFIFO); 859 } 860 } 861 862 static void fas216_aborttransfer(FAS216_Info *info) 863 { 864 fas216_checkmagic(info); 865 866 if (info->dma.transfer_type == fasdma_real_all || 867 info->dma.transfer_type == fasdma_real_block) 868 info->dma.stop(info->host, &info->scsi.SCp); 869 870 info->dma.transfer_type = fasdma_none; 871 fas216_cmd(info, CMD_FLUSHFIFO); 872 } 873 874 static void fas216_kick(FAS216_Info *info); 875 876 /** 877 * fas216_disconnected_intr - handle device disconnection 878 * @info: interface from which device disconnected from 879 * 880 * Handle device disconnection 881 */ 882 static void fas216_disconnect_intr(FAS216_Info *info) 883 { 884 unsigned long flags; 885 886 fas216_checkmagic(info); 887 888 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x", 889 info->scsi.phase); 890 891 msgqueue_flush(&info->scsi.msgs); 892 893 switch (info->scsi.phase) { 894 case PHASE_SELECTION: /* while selecting - no target */ 895 case PHASE_SELSTEPS: 896 fas216_done(info, DID_NO_CONNECT); 897 break; 898 899 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */ 900 info->scsi.disconnectable = 1; 901 info->scsi.phase = PHASE_IDLE; 902 info->stats.disconnects += 1; 903 spin_lock_irqsave(&info->host_lock, flags); 904 if (info->scsi.phase == PHASE_IDLE) 905 fas216_kick(info); 906 spin_unlock_irqrestore(&info->host_lock, flags); 907 break; 908 909 case PHASE_DONE: /* at end of command - complete */ 910 fas216_done(info, DID_OK); 911 break; 912 913 case PHASE_MSGOUT: /* message out - possible ABORT message */ 914 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) { 915 info->scsi.aborting = 0; 916 fas216_done(info, DID_ABORT); 917 break; 918 } 919 fallthrough; 920 921 default: /* huh? */ 922 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n", 923 info->host->host_no, fas216_target(info), fas216_drv_phase(info)); 924 print_debug_list(); 925 fas216_stoptransfer(info); 926 fas216_done(info, DID_ERROR); 927 break; 928 } 929 } 930 931 /** 932 * fas216_reselected_intr - start reconnection of a device 933 * @info: interface which was reselected 934 * 935 * Start reconnection of a device 936 */ 937 static void 938 fas216_reselected_intr(FAS216_Info *info) 939 { 940 unsigned int cfis, i; 941 unsigned char msg[4]; 942 unsigned char target, lun, tag; 943 944 fas216_checkmagic(info); 945 946 WARN_ON(info->scsi.phase == PHASE_SELECTION || 947 info->scsi.phase == PHASE_SELSTEPS); 948 949 cfis = fas216_readb(info, REG_CFIS); 950 951 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x", 952 info->scsi.phase, cfis); 953 954 cfis &= CFIS_CF; 955 956 if (cfis < 2 || cfis > 4) { 957 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n", 958 info->host->host_no); 959 goto bad_message; 960 } 961 962 for (i = 0; i < cfis; i++) 963 msg[i] = fas216_readb(info, REG_FF); 964 965 if (!(msg[0] & (1 << info->host->this_id)) || 966 !(msg[1] & 0x80)) 967 goto initiator_error; 968 969 target = msg[0] & ~(1 << info->host->this_id); 970 target = ffs(target) - 1; 971 lun = msg[1] & 7; 972 tag = 0; 973 974 if (cfis >= 3) { 975 if (msg[2] != SIMPLE_QUEUE_TAG) 976 goto initiator_error; 977 978 tag = msg[3]; 979 } 980 981 /* set up for synchronous transfers */ 982 fas216_writeb(info, REG_SDID, target); 983 fas216_set_sync(info, target); 984 msgqueue_flush(&info->scsi.msgs); 985 986 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x", 987 target, lun, tag); 988 989 if (info->scsi.disconnectable && info->SCpnt) { 990 info->scsi.disconnectable = 0; 991 if (info->SCpnt->device->id == target && 992 info->SCpnt->device->lun == lun && 993 info->SCpnt->tag == tag) { 994 fas216_log(info, LOG_CONNECT, "reconnected previously executing command"); 995 } else { 996 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 997 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue"); 998 info->SCpnt = NULL; 999 } 1000 } 1001 if (!info->SCpnt) { 1002 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected, 1003 target, lun, tag); 1004 fas216_log(info, LOG_CONNECT, "had to get command"); 1005 } 1006 1007 if (info->SCpnt) { 1008 /* 1009 * Restore data pointer from SAVED data pointer 1010 */ 1011 info->scsi.SCp = info->SCpnt->SCp; 1012 1013 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]", 1014 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1015 info->scsi.phase = PHASE_MSGIN; 1016 } else { 1017 /* 1018 * Our command structure not found - abort the 1019 * command on the target. Since we have no 1020 * record of this command, we can't send 1021 * an INITIATOR DETECTED ERROR message. 1022 */ 1023 fas216_cmd(info, CMD_SETATN); 1024 1025 #if 0 1026 if (tag) 1027 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag); 1028 else 1029 #endif 1030 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT); 1031 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1032 info->scsi.aborting = 1; 1033 } 1034 1035 fas216_cmd(info, CMD_MSGACCEPTED); 1036 return; 1037 1038 initiator_error: 1039 printk(KERN_ERR "scsi%d.H: error during reselection: bytes", 1040 info->host->host_no); 1041 for (i = 0; i < cfis; i++) 1042 printk(" %02x", msg[i]); 1043 printk("\n"); 1044 bad_message: 1045 fas216_cmd(info, CMD_SETATN); 1046 msgqueue_flush(&info->scsi.msgs); 1047 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1048 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1049 fas216_cmd(info, CMD_MSGACCEPTED); 1050 } 1051 1052 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen) 1053 { 1054 int i; 1055 1056 switch (message[0]) { 1057 case COMMAND_COMPLETE: 1058 if (msglen != 1) 1059 goto unrecognised; 1060 1061 printk(KERN_ERR "scsi%d.%c: command complete with no " 1062 "status in MESSAGE_IN?\n", 1063 info->host->host_no, fas216_target(info)); 1064 break; 1065 1066 case SAVE_POINTERS: 1067 if (msglen != 1) 1068 goto unrecognised; 1069 1070 /* 1071 * Save current data pointer to SAVED data pointer 1072 * SCSI II standard says that we must not acknowledge 1073 * this until we have really saved pointers. 1074 * NOTE: we DO NOT save the command nor status pointers 1075 * as required by the SCSI II standard. These always 1076 * point to the start of their respective areas. 1077 */ 1078 info->SCpnt->SCp = info->scsi.SCp; 1079 info->SCpnt->SCp.sent_command = 0; 1080 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1081 "save data pointers: [%p, %X]", 1082 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1083 break; 1084 1085 case RESTORE_POINTERS: 1086 if (msglen != 1) 1087 goto unrecognised; 1088 1089 /* 1090 * Restore current data pointer from SAVED data pointer 1091 */ 1092 info->scsi.SCp = info->SCpnt->SCp; 1093 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1094 "restore data pointers: [%p, 0x%x]", 1095 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1096 break; 1097 1098 case DISCONNECT: 1099 if (msglen != 1) 1100 goto unrecognised; 1101 1102 info->scsi.phase = PHASE_MSGIN_DISCONNECT; 1103 break; 1104 1105 case MESSAGE_REJECT: 1106 if (msglen != 1) 1107 goto unrecognised; 1108 1109 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) { 1110 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8: 1111 fas216_handlesync(info, message); 1112 break; 1113 1114 default: 1115 fas216_log(info, 0, "reject, last message 0x%04x", 1116 fas216_get_last_msg(info, info->scsi.msgin_fifo)); 1117 } 1118 break; 1119 1120 case NOP: 1121 break; 1122 1123 case EXTENDED_MESSAGE: 1124 if (msglen < 3) 1125 goto unrecognised; 1126 1127 switch (message[2]) { 1128 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */ 1129 fas216_handlesync(info, message); 1130 break; 1131 1132 default: 1133 goto unrecognised; 1134 } 1135 break; 1136 1137 default: 1138 goto unrecognised; 1139 } 1140 return; 1141 1142 unrecognised: 1143 fas216_log(info, 0, "unrecognised message, rejecting"); 1144 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info)); 1145 for (i = 0; i < msglen; i++) 1146 printk("%s%02X", i & 31 ? " " : "\n ", message[i]); 1147 printk("\n"); 1148 1149 /* 1150 * Something strange seems to be happening here - 1151 * I can't use SETATN since the chip gives me an 1152 * invalid command interrupt when I do. Weird. 1153 */ 1154 fas216_cmd(info, CMD_NOP); 1155 fas216_dumpstate(info); 1156 fas216_cmd(info, CMD_SETATN); 1157 msgqueue_flush(&info->scsi.msgs); 1158 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 1159 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1160 fas216_dumpstate(info); 1161 } 1162 1163 static int fas216_wait_cmd(FAS216_Info *info, int cmd) 1164 { 1165 int tout; 1166 int stat; 1167 1168 fas216_cmd(info, cmd); 1169 1170 for (tout = 1000; tout; tout -= 1) { 1171 stat = fas216_readb(info, REG_STAT); 1172 if (stat & (STAT_INT|STAT_PARITYERROR)) 1173 break; 1174 udelay(1); 1175 } 1176 1177 return stat; 1178 } 1179 1180 static int fas216_get_msg_byte(FAS216_Info *info) 1181 { 1182 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED); 1183 1184 if ((stat & STAT_INT) == 0) 1185 goto timedout; 1186 1187 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1188 goto unexpected_phase_change; 1189 1190 fas216_readb(info, REG_INST); 1191 1192 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO); 1193 1194 if ((stat & STAT_INT) == 0) 1195 goto timedout; 1196 1197 if (stat & STAT_PARITYERROR) 1198 goto parity_error; 1199 1200 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1201 goto unexpected_phase_change; 1202 1203 fas216_readb(info, REG_INST); 1204 1205 return fas216_readb(info, REG_FF); 1206 1207 timedout: 1208 fas216_log(info, LOG_ERROR, "timed out waiting for message byte"); 1209 return -1; 1210 1211 unexpected_phase_change: 1212 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat); 1213 return -2; 1214 1215 parity_error: 1216 fas216_log(info, LOG_ERROR, "parity error during message in phase"); 1217 return -3; 1218 } 1219 1220 /** 1221 * fas216_message - handle a function done interrupt from FAS216 chip 1222 * @info: interface which caused function done interrupt 1223 * 1224 * Handle a function done interrupt from FAS216 chip 1225 */ 1226 static void fas216_message(FAS216_Info *info) 1227 { 1228 unsigned char *message = info->scsi.message; 1229 unsigned int msglen = 1; 1230 int msgbyte = 0; 1231 1232 fas216_checkmagic(info); 1233 1234 message[0] = fas216_readb(info, REG_FF); 1235 1236 if (message[0] == EXTENDED_MESSAGE) { 1237 msgbyte = fas216_get_msg_byte(info); 1238 1239 if (msgbyte >= 0) { 1240 message[1] = msgbyte; 1241 1242 for (msglen = 2; msglen < message[1] + 2; msglen++) { 1243 msgbyte = fas216_get_msg_byte(info); 1244 1245 if (msgbyte >= 0) 1246 message[msglen] = msgbyte; 1247 else 1248 break; 1249 } 1250 } 1251 } 1252 1253 if (msgbyte == -3) 1254 goto parity_error; 1255 1256 #ifdef DEBUG_MESSAGES 1257 { 1258 int i; 1259 1260 printk("scsi%d.%c: message in: ", 1261 info->host->host_no, fas216_target(info)); 1262 for (i = 0; i < msglen; i++) 1263 printk("%02X ", message[i]); 1264 printk("\n"); 1265 } 1266 #endif 1267 1268 fas216_parse_message(info, message, msglen); 1269 fas216_cmd(info, CMD_MSGACCEPTED); 1270 return; 1271 1272 parity_error: 1273 fas216_cmd(info, CMD_SETATN); 1274 msgqueue_flush(&info->scsi.msgs); 1275 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR); 1276 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1277 fas216_cmd(info, CMD_MSGACCEPTED); 1278 return; 1279 } 1280 1281 /** 1282 * fas216_send_command - send command after all message bytes have been sent 1283 * @info: interface which caused bus service 1284 * 1285 * Send a command to a target after all message bytes have been sent 1286 */ 1287 static void fas216_send_command(FAS216_Info *info) 1288 { 1289 int i; 1290 1291 fas216_checkmagic(info); 1292 1293 fas216_cmd(info, CMD_NOP|CMD_WITHDMA); 1294 fas216_cmd(info, CMD_FLUSHFIFO); 1295 1296 /* load command */ 1297 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++) 1298 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]); 1299 1300 fas216_cmd(info, CMD_TRANSFERINFO); 1301 1302 info->scsi.phase = PHASE_COMMAND; 1303 } 1304 1305 /** 1306 * fas216_send_messageout - handle bus service to send a message 1307 * @info: interface which caused bus service 1308 * 1309 * Handle bus service to send a message. 1310 * Note: We do not allow the device to change the data direction! 1311 */ 1312 static void fas216_send_messageout(FAS216_Info *info, int start) 1313 { 1314 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1315 1316 fas216_checkmagic(info); 1317 1318 fas216_cmd(info, CMD_FLUSHFIFO); 1319 1320 if (tot_msglen) { 1321 struct message *msg; 1322 int msgnr = 0; 1323 1324 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1325 int i; 1326 1327 for (i = start; i < msg->length; i++) 1328 fas216_writeb(info, REG_FF, msg->msg[i]); 1329 1330 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1331 start = 0; 1332 } 1333 } else 1334 fas216_writeb(info, REG_FF, NOP); 1335 1336 fas216_cmd(info, CMD_TRANSFERINFO); 1337 1338 info->scsi.phase = PHASE_MSGOUT; 1339 } 1340 1341 /** 1342 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip 1343 * @info: interface which caused bus service interrupt 1344 * @stat: Status register contents 1345 * @is: SCSI Status register contents 1346 * 1347 * Handle a bus service interrupt from FAS216 chip 1348 */ 1349 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1350 { 1351 fas216_checkmagic(info); 1352 1353 fas216_log(info, LOG_BUSSERVICE, 1354 "bus service: stat=%02x is=%02x phase=%02x", 1355 stat, is, info->scsi.phase); 1356 1357 switch (info->scsi.phase) { 1358 case PHASE_SELECTION: 1359 if ((is & IS_BITS) != IS_MSGBYTESENT) 1360 goto bad_is; 1361 break; 1362 1363 case PHASE_SELSTEPS: 1364 switch (is & IS_BITS) { 1365 case IS_SELARB: 1366 case IS_MSGBYTESENT: 1367 goto bad_is; 1368 1369 case IS_NOTCOMMAND: 1370 case IS_EARLYPHASE: 1371 if ((stat & STAT_BUSMASK) == STAT_MESGIN) 1372 break; 1373 goto bad_is; 1374 1375 case IS_COMPLETE: 1376 break; 1377 } 1378 1379 default: 1380 break; 1381 } 1382 1383 fas216_cmd(info, CMD_NOP); 1384 1385 #define STATE(st,ph) ((ph) << 3 | (st)) 1386 /* This table describes the legal SCSI state transitions, 1387 * as described by the SCSI II spec. 1388 */ 1389 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) { 1390 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */ 1391 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */ 1392 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */ 1393 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */ 1394 info->scsi.phase = PHASE_DATAIN; 1395 fas216_transfer(info); 1396 return; 1397 1398 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */ 1399 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */ 1400 fas216_cleanuptransfer(info); 1401 fas216_transfer(info); 1402 return; 1403 1404 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */ 1405 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */ 1406 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */ 1407 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */ 1408 fas216_cmd(info, CMD_FLUSHFIFO); 1409 info->scsi.phase = PHASE_DATAOUT; 1410 fas216_transfer(info); 1411 return; 1412 1413 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */ 1414 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */ 1415 fas216_stoptransfer(info); 1416 fallthrough; 1417 1418 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */ 1419 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */ 1420 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */ 1421 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */ 1422 fas216_cmd(info, CMD_INITCMDCOMPLETE); 1423 info->scsi.phase = PHASE_STATUS; 1424 return; 1425 1426 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */ 1427 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */ 1428 fas216_stoptransfer(info); 1429 fallthrough; 1430 1431 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */ 1432 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */ 1433 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */ 1434 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1435 fas216_cmd(info, CMD_FLUSHFIFO); 1436 fas216_cmd(info, CMD_TRANSFERINFO); 1437 info->scsi.phase = PHASE_MSGIN; 1438 return; 1439 1440 case STATE(STAT_MESGIN, PHASE_MSGIN): 1441 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1442 fas216_cmd(info, CMD_TRANSFERINFO); 1443 return; 1444 1445 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */ 1446 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */ 1447 fas216_send_command(info); 1448 info->scsi.phase = PHASE_COMMAND; 1449 return; 1450 1451 1452 /* 1453 * Selection -> Message Out 1454 */ 1455 case STATE(STAT_MESGOUT, PHASE_SELECTION): 1456 fas216_send_messageout(info, 1); 1457 return; 1458 1459 /* 1460 * Message Out -> Message Out 1461 */ 1462 case STATE(STAT_MESGOUT, PHASE_SELSTEPS): 1463 case STATE(STAT_MESGOUT, PHASE_MSGOUT): 1464 /* 1465 * If we get another message out phase, this usually 1466 * means some parity error occurred. Resend complete 1467 * set of messages. If we have more than one byte to 1468 * send, we need to assert ATN again. 1469 */ 1470 if (info->device[info->SCpnt->device->id].parity_check) { 1471 /* 1472 * We were testing... good, the device 1473 * supports parity checking. 1474 */ 1475 info->device[info->SCpnt->device->id].parity_check = 0; 1476 info->device[info->SCpnt->device->id].parity_enabled = 1; 1477 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1478 } 1479 1480 if (msgqueue_msglength(&info->scsi.msgs) > 1) 1481 fas216_cmd(info, CMD_SETATN); 1482 fallthrough; 1483 1484 /* 1485 * Any -> Message Out 1486 */ 1487 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT): 1488 fas216_send_messageout(info, 0); 1489 return; 1490 1491 /* Error recovery rules. 1492 * These either attempt to abort or retry the operation. 1493 * TODO: we need more of these 1494 */ 1495 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */ 1496 /* error - we've sent out all the command bytes 1497 * we have. 1498 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS 1499 * to include the command bytes sent for this to work 1500 * correctly. 1501 */ 1502 printk(KERN_ERR "scsi%d.%c: " 1503 "target trying to receive more command bytes\n", 1504 info->host->host_no, fas216_target(info)); 1505 fas216_cmd(info, CMD_SETATN); 1506 fas216_set_stc(info, 15); 1507 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA); 1508 msgqueue_flush(&info->scsi.msgs); 1509 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1510 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1511 return; 1512 } 1513 1514 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) { 1515 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n", 1516 info->host->host_no, fas216_target(info), 1517 fas216_bus_phase(stat)); 1518 msgqueue_flush(&info->scsi.msgs); 1519 fas216_cmd(info, CMD_SETATN); 1520 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1521 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1522 info->scsi.aborting = 1; 1523 fas216_cmd(info, CMD_TRANSFERINFO); 1524 return; 1525 } 1526 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n", 1527 info->host->host_no, fas216_target(info), 1528 fas216_bus_phase(stat), 1529 fas216_drv_phase(info)); 1530 print_debug_list(); 1531 return; 1532 1533 bad_is: 1534 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS); 1535 fas216_dumpstate(info); 1536 print_debug_list(); 1537 1538 fas216_done(info, DID_ERROR); 1539 } 1540 1541 /** 1542 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip 1543 * @info: interface which caused function done interrupt 1544 * @stat: Status register contents 1545 * @is: SCSI Status register contents 1546 * 1547 * Handle a function done interrupt from FAS216 chip 1548 */ 1549 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1550 { 1551 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF; 1552 1553 fas216_checkmagic(info); 1554 1555 fas216_log(info, LOG_FUNCTIONDONE, 1556 "function done: stat=%02x is=%02x phase=%02x", 1557 stat, is, info->scsi.phase); 1558 1559 switch (info->scsi.phase) { 1560 case PHASE_STATUS: /* status phase - read status and msg */ 1561 if (fifo_len != 2) { 1562 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len); 1563 } 1564 /* 1565 * Read status then message byte. 1566 */ 1567 info->scsi.SCp.Status = fas216_readb(info, REG_FF); 1568 info->scsi.SCp.Message = fas216_readb(info, REG_FF); 1569 info->scsi.phase = PHASE_DONE; 1570 fas216_cmd(info, CMD_MSGACCEPTED); 1571 break; 1572 1573 case PHASE_IDLE: 1574 case PHASE_SELECTION: 1575 case PHASE_SELSTEPS: 1576 break; 1577 1578 case PHASE_MSGIN: /* message in phase */ 1579 if ((stat & STAT_BUSMASK) == STAT_MESGIN) { 1580 info->scsi.msgin_fifo = fifo_len; 1581 fas216_message(info); 1582 break; 1583 } 1584 fallthrough; 1585 1586 default: 1587 fas216_log(info, 0, "internal phase %s for function done?" 1588 " What do I do with this?", 1589 fas216_target(info), fas216_drv_phase(info)); 1590 } 1591 } 1592 1593 static void fas216_bus_reset(FAS216_Info *info) 1594 { 1595 neg_t sync_state; 1596 int i; 1597 1598 msgqueue_flush(&info->scsi.msgs); 1599 1600 sync_state = neg_invalid; 1601 1602 #ifdef SCSI2_SYNC 1603 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA)) 1604 sync_state = neg_wait; 1605 #endif 1606 1607 info->scsi.phase = PHASE_IDLE; 1608 info->SCpnt = NULL; /* bug! */ 1609 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp)); 1610 1611 for (i = 0; i < 8; i++) { 1612 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok; 1613 info->device[i].sync_state = sync_state; 1614 info->device[i].period = info->ifcfg.asyncperiod / 4; 1615 info->device[i].stp = info->scsi.async_stp; 1616 info->device[i].sof = 0; 1617 info->device[i].wide_xfer = 0; 1618 } 1619 1620 info->rst_bus_status = 1; 1621 wake_up(&info->eh_wait); 1622 } 1623 1624 /** 1625 * fas216_intr - handle interrupts to progress a command 1626 * @info: interface to service 1627 * 1628 * Handle interrupts from the interface to progress a command 1629 */ 1630 irqreturn_t fas216_intr(FAS216_Info *info) 1631 { 1632 unsigned char inst, is, stat; 1633 int handled = IRQ_NONE; 1634 1635 fas216_checkmagic(info); 1636 1637 stat = fas216_readb(info, REG_STAT); 1638 is = fas216_readb(info, REG_IS); 1639 inst = fas216_readb(info, REG_INST); 1640 1641 add_debug_list(stat, is, inst, info->scsi.phase); 1642 1643 if (stat & STAT_INT) { 1644 if (inst & INST_BUSRESET) { 1645 fas216_log(info, 0, "bus reset detected"); 1646 fas216_bus_reset(info); 1647 scsi_report_bus_reset(info->host, 0); 1648 } else if (inst & INST_ILLEGALCMD) { 1649 fas216_log(info, LOG_ERROR, "illegal command given\n"); 1650 fas216_dumpstate(info); 1651 print_debug_list(); 1652 } else if (inst & INST_DISCONNECT) 1653 fas216_disconnect_intr(info); 1654 else if (inst & INST_RESELECTED) /* reselected */ 1655 fas216_reselected_intr(info); 1656 else if (inst & INST_BUSSERVICE) /* bus service request */ 1657 fas216_busservice_intr(info, stat, is); 1658 else if (inst & INST_FUNCDONE) /* function done */ 1659 fas216_funcdone_intr(info, stat, is); 1660 else 1661 fas216_log(info, 0, "unknown interrupt received:" 1662 " phase %s inst %02X is %02X stat %02X", 1663 fas216_drv_phase(info), inst, is, stat); 1664 handled = IRQ_HANDLED; 1665 } 1666 return handled; 1667 } 1668 1669 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1670 { 1671 int tot_msglen; 1672 1673 /* following what the ESP driver says */ 1674 fas216_set_stc(info, 0); 1675 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1676 1677 /* flush FIFO */ 1678 fas216_cmd(info, CMD_FLUSHFIFO); 1679 1680 /* load bus-id and timeout */ 1681 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1682 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1683 1684 /* synchronous transfers */ 1685 fas216_set_sync(info, SCpnt->device->id); 1686 1687 tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1688 1689 #ifdef DEBUG_MESSAGES 1690 { 1691 struct message *msg; 1692 int msgnr = 0, i; 1693 1694 printk("scsi%d.%c: message out: ", 1695 info->host->host_no, '0' + SCpnt->device->id); 1696 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1697 printk("{ "); 1698 for (i = 0; i < msg->length; i++) 1699 printk("%02x ", msg->msg[i]); 1700 printk("} "); 1701 } 1702 printk("\n"); 1703 } 1704 #endif 1705 1706 if (tot_msglen == 1 || tot_msglen == 3) { 1707 /* 1708 * We have an easy message length to send... 1709 */ 1710 struct message *msg; 1711 int msgnr = 0, i; 1712 1713 info->scsi.phase = PHASE_SELSTEPS; 1714 1715 /* load message bytes */ 1716 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1717 for (i = 0; i < msg->length; i++) 1718 fas216_writeb(info, REG_FF, msg->msg[i]); 1719 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1720 } 1721 1722 /* load command */ 1723 for (i = 0; i < SCpnt->cmd_len; i++) 1724 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]); 1725 1726 if (tot_msglen == 1) 1727 fas216_cmd(info, CMD_SELECTATN); 1728 else 1729 fas216_cmd(info, CMD_SELECTATN3); 1730 } else { 1731 /* 1732 * We have an unusual number of message bytes to send. 1733 * Load first byte into fifo, and issue SELECT with ATN and 1734 * stop steps. 1735 */ 1736 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1737 1738 fas216_writeb(info, REG_FF, msg->msg[0]); 1739 msg->fifo = 1; 1740 1741 fas216_cmd(info, CMD_SELECTATNSTOP); 1742 } 1743 } 1744 1745 /* 1746 * Decide whether we need to perform a parity test on this device. 1747 * Can also be used to force parity error conditions during initial 1748 * information transfer phase (message out) for test purposes. 1749 */ 1750 static int parity_test(FAS216_Info *info, int target) 1751 { 1752 #if 0 1753 if (target == 3) { 1754 info->device[target].parity_check = 0; 1755 return 1; 1756 } 1757 #endif 1758 return info->device[target].parity_check; 1759 } 1760 1761 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1762 { 1763 int disconnect_ok; 1764 1765 /* 1766 * claim host busy 1767 */ 1768 info->scsi.phase = PHASE_SELECTION; 1769 info->scsi.SCp = SCpnt->SCp; 1770 info->SCpnt = SCpnt; 1771 info->dma.transfer_type = fasdma_none; 1772 1773 if (parity_test(info, SCpnt->device->id)) 1774 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE); 1775 else 1776 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1777 1778 /* 1779 * Don't allow request sense commands to disconnect. 1780 */ 1781 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE && 1782 info->device[SCpnt->device->id].disconnect_ok; 1783 1784 /* 1785 * build outgoing message bytes 1786 */ 1787 msgqueue_flush(&info->scsi.msgs); 1788 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun)); 1789 1790 /* 1791 * add tag message if required 1792 */ 1793 if (SCpnt->tag) 1794 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag); 1795 1796 do { 1797 #ifdef SCSI2_SYNC 1798 if ((info->device[SCpnt->device->id].sync_state == neg_wait || 1799 info->device[SCpnt->device->id].sync_state == neg_complete) && 1800 (SCpnt->cmnd[0] == REQUEST_SENSE || 1801 SCpnt->cmnd[0] == INQUIRY)) { 1802 info->device[SCpnt->device->id].sync_state = neg_inprogress; 1803 msgqueue_addmsg(&info->scsi.msgs, 5, 1804 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1805 1000 / info->ifcfg.clockrate, 1806 info->ifcfg.sync_max_depth); 1807 break; 1808 } 1809 #endif 1810 } while (0); 1811 1812 __fas216_start_command(info, SCpnt); 1813 } 1814 1815 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1816 { 1817 #ifdef SCSI2_TAG 1818 /* 1819 * tagged queuing - allocate a new tag to this command 1820 */ 1821 if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE && 1822 SCpnt->cmnd[0] != INQUIRY) { 1823 SCpnt->device->current_tag += 1; 1824 if (SCpnt->device->current_tag == 0) 1825 SCpnt->device->current_tag = 1; 1826 SCpnt->tag = SCpnt->device->current_tag; 1827 } else 1828 #endif 1829 set_bit(SCpnt->device->id * 8 + 1830 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 1831 1832 info->stats.removes += 1; 1833 switch (SCpnt->cmnd[0]) { 1834 case WRITE_6: 1835 case WRITE_10: 1836 case WRITE_12: 1837 info->stats.writes += 1; 1838 break; 1839 case READ_6: 1840 case READ_10: 1841 case READ_12: 1842 info->stats.reads += 1; 1843 break; 1844 default: 1845 info->stats.miscs += 1; 1846 break; 1847 } 1848 } 1849 1850 static void fas216_do_bus_device_reset(FAS216_Info *info, 1851 struct scsi_cmnd *SCpnt) 1852 { 1853 struct message *msg; 1854 1855 /* 1856 * claim host busy 1857 */ 1858 info->scsi.phase = PHASE_SELECTION; 1859 info->scsi.SCp = SCpnt->SCp; 1860 info->SCpnt = SCpnt; 1861 info->dma.transfer_type = fasdma_none; 1862 1863 fas216_log(info, LOG_ERROR, "sending bus device reset"); 1864 1865 msgqueue_flush(&info->scsi.msgs); 1866 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET); 1867 1868 /* following what the ESP driver says */ 1869 fas216_set_stc(info, 0); 1870 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1871 1872 /* flush FIFO */ 1873 fas216_cmd(info, CMD_FLUSHFIFO); 1874 1875 /* load bus-id and timeout */ 1876 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1877 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1878 1879 /* synchronous transfers */ 1880 fas216_set_sync(info, SCpnt->device->id); 1881 1882 msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1883 1884 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET); 1885 msg->fifo = 1; 1886 1887 fas216_cmd(info, CMD_SELECTATNSTOP); 1888 } 1889 1890 /** 1891 * fas216_kick - kick a command to the interface 1892 * @info: our host interface to kick 1893 * 1894 * Kick a command to the interface, interface should be idle. 1895 * Notes: Interrupts are always disabled! 1896 */ 1897 static void fas216_kick(FAS216_Info *info) 1898 { 1899 struct scsi_cmnd *SCpnt = NULL; 1900 #define TYPE_OTHER 0 1901 #define TYPE_RESET 1 1902 #define TYPE_QUEUE 2 1903 int where_from = TYPE_OTHER; 1904 1905 fas216_checkmagic(info); 1906 1907 /* 1908 * Obtain the next command to process. 1909 */ 1910 do { 1911 if (info->rstSCpnt) { 1912 SCpnt = info->rstSCpnt; 1913 /* don't remove it */ 1914 where_from = TYPE_RESET; 1915 break; 1916 } 1917 1918 if (info->reqSCpnt) { 1919 SCpnt = info->reqSCpnt; 1920 info->reqSCpnt = NULL; 1921 break; 1922 } 1923 1924 if (info->origSCpnt) { 1925 SCpnt = info->origSCpnt; 1926 info->origSCpnt = NULL; 1927 break; 1928 } 1929 1930 /* retrieve next command */ 1931 if (!SCpnt) { 1932 SCpnt = queue_remove_exclude(&info->queues.issue, 1933 info->busyluns); 1934 where_from = TYPE_QUEUE; 1935 break; 1936 } 1937 } while (0); 1938 1939 if (!SCpnt) { 1940 /* 1941 * no command pending, so enable reselection. 1942 */ 1943 fas216_cmd(info, CMD_ENABLESEL); 1944 return; 1945 } 1946 1947 /* 1948 * We're going to start a command, so disable reselection 1949 */ 1950 fas216_cmd(info, CMD_DISABLESEL); 1951 1952 if (info->scsi.disconnectable && info->SCpnt) { 1953 fas216_log(info, LOG_CONNECT, 1954 "moved command for %d to disconnected queue", 1955 info->SCpnt->device->id); 1956 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 1957 info->scsi.disconnectable = 0; 1958 info->SCpnt = NULL; 1959 } 1960 1961 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt, 1962 "starting"); 1963 1964 switch (where_from) { 1965 case TYPE_QUEUE: 1966 fas216_allocate_tag(info, SCpnt); 1967 fallthrough; 1968 case TYPE_OTHER: 1969 fas216_start_command(info, SCpnt); 1970 break; 1971 case TYPE_RESET: 1972 fas216_do_bus_device_reset(info, SCpnt); 1973 break; 1974 } 1975 1976 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]", 1977 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1978 1979 /* 1980 * should now get either DISCONNECT or 1981 * (FUNCTION DONE with BUS SERVICE) interrupt 1982 */ 1983 } 1984 1985 /* 1986 * Clean up from issuing a BUS DEVICE RESET message to a device. 1987 */ 1988 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 1989 unsigned int result) 1990 { 1991 fas216_log(info, LOG_ERROR, "fas216 device reset complete"); 1992 1993 info->rstSCpnt = NULL; 1994 info->rst_dev_status = 1; 1995 wake_up(&info->eh_wait); 1996 } 1997 1998 /** 1999 * fas216_rq_sns_done - Finish processing automatic request sense command 2000 * @info: interface that completed 2001 * @SCpnt: command that completed 2002 * @result: driver byte of result 2003 * 2004 * Finish processing automatic request sense command 2005 */ 2006 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 2007 unsigned int result) 2008 { 2009 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2010 "request sense complete, result=0x%04x%02x%02x", 2011 result, SCpnt->SCp.Message, SCpnt->SCp.Status); 2012 2013 if (result != DID_OK || SCpnt->SCp.Status != SAM_STAT_GOOD) 2014 /* 2015 * Something went wrong. Make sure that we don't 2016 * have valid data in the sense buffer that could 2017 * confuse the higher levels. 2018 */ 2019 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2020 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id); 2021 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); } 2022 /* 2023 * Note that we don't set SCpnt->result, since that should 2024 * reflect the status of the command that we were asked by 2025 * the upper layers to process. This would have been set 2026 * correctly by fas216_std_done. 2027 */ 2028 scsi_eh_restore_cmnd(SCpnt, &info->ses); 2029 SCpnt->scsi_done(SCpnt); 2030 } 2031 2032 /** 2033 * fas216_std_done - finish processing of standard command 2034 * @info: interface that completed 2035 * @SCpnt: command that completed 2036 * @result: driver byte of result 2037 * 2038 * Finish processing of standard command 2039 */ 2040 static void 2041 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) 2042 { 2043 info->stats.fins += 1; 2044 2045 set_host_byte(SCpnt, result); 2046 if (result == DID_OK) 2047 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message); 2048 set_status_byte(SCpnt, info->scsi.SCp.Status); 2049 2050 fas216_log_command(info, LOG_CONNECT, SCpnt, 2051 "command complete, result=0x%08x", SCpnt->result); 2052 2053 /* 2054 * If the driver detected an error, we're all done. 2055 */ 2056 if (get_host_byte(SCpnt) != DID_OK) 2057 goto done; 2058 2059 /* 2060 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED 2061 * status, request the sense information. 2062 */ 2063 if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION || 2064 get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED) 2065 goto request_sense; 2066 2067 /* 2068 * If the command did not complete with GOOD status, 2069 * we are all done here. 2070 */ 2071 if (get_status_byte(SCpnt) != SAM_STAT_GOOD) 2072 goto done; 2073 2074 /* 2075 * We have successfully completed a command. Make sure that 2076 * we do not have any buffers left to transfer. The world 2077 * is not perfect, and we seem to occasionally hit this. 2078 * It can be indicative of a buggy driver, target or the upper 2079 * levels of the SCSI code. 2080 */ 2081 if (info->scsi.SCp.ptr) { 2082 switch (SCpnt->cmnd[0]) { 2083 case INQUIRY: 2084 case START_STOP: 2085 case MODE_SENSE: 2086 break; 2087 2088 default: 2089 scmd_printk(KERN_ERR, SCpnt, 2090 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n", 2091 SCpnt->result, info->scsi.SCp.ptr, 2092 info->scsi.SCp.this_residual); 2093 scsi_print_command(SCpnt); 2094 set_host_byte(SCpnt, DID_ERROR); 2095 goto request_sense; 2096 } 2097 } 2098 2099 done: 2100 if (SCpnt->scsi_done) { 2101 SCpnt->scsi_done(SCpnt); 2102 return; 2103 } 2104 2105 panic("scsi%d.H: null scsi_done function in fas216_done", 2106 info->host->host_no); 2107 2108 2109 request_sense: 2110 if (SCpnt->cmnd[0] == REQUEST_SENSE) 2111 goto done; 2112 2113 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0); 2114 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2115 "requesting sense"); 2116 init_SCp(SCpnt); 2117 SCpnt->SCp.Message = 0; 2118 SCpnt->SCp.Status = 0; 2119 SCpnt->tag = 0; 2120 SCpnt->host_scribble = (void *)fas216_rq_sns_done; 2121 2122 /* 2123 * Place this command into the high priority "request 2124 * sense" slot. This will be the very next command 2125 * executed, unless a target connects to us. 2126 */ 2127 if (info->reqSCpnt) 2128 printk(KERN_WARNING "scsi%d.%c: losing request command\n", 2129 info->host->host_no, '0' + SCpnt->device->id); 2130 info->reqSCpnt = SCpnt; 2131 } 2132 2133 /** 2134 * fas216_done - complete processing for current command 2135 * @info: interface that completed 2136 * @result: driver byte of result 2137 * 2138 * Complete processing for current command 2139 */ 2140 static void fas216_done(FAS216_Info *info, unsigned int result) 2141 { 2142 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int); 2143 struct scsi_cmnd *SCpnt; 2144 unsigned long flags; 2145 2146 fas216_checkmagic(info); 2147 2148 if (!info->SCpnt) 2149 goto no_command; 2150 2151 SCpnt = info->SCpnt; 2152 info->SCpnt = NULL; 2153 info->scsi.phase = PHASE_IDLE; 2154 2155 if (info->scsi.aborting) { 2156 fas216_log(info, 0, "uncaught abort - returning DID_ABORT"); 2157 result = DID_ABORT; 2158 info->scsi.aborting = 0; 2159 } 2160 2161 /* 2162 * Sanity check the completion - if we have zero bytes left 2163 * to transfer, we should not have a valid pointer. 2164 */ 2165 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) { 2166 scmd_printk(KERN_INFO, SCpnt, 2167 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n", 2168 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 2169 info->scsi.SCp.ptr = NULL; 2170 scsi_print_command(SCpnt); 2171 } 2172 2173 /* 2174 * Clear down this command as completed. If we need to request 2175 * the sense information, fas216_kick will re-assert the busy 2176 * status. 2177 */ 2178 info->device[SCpnt->device->id].parity_check = 0; 2179 clear_bit(SCpnt->device->id * 8 + 2180 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2181 2182 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble; 2183 fn(info, SCpnt, result); 2184 2185 if (info->scsi.irq) { 2186 spin_lock_irqsave(&info->host_lock, flags); 2187 if (info->scsi.phase == PHASE_IDLE) 2188 fas216_kick(info); 2189 spin_unlock_irqrestore(&info->host_lock, flags); 2190 } 2191 return; 2192 2193 no_command: 2194 panic("scsi%d.H: null command in fas216_done", 2195 info->host->host_no); 2196 } 2197 2198 /** 2199 * fas216_queue_command - queue a command for adapter to process. 2200 * @SCpnt: Command to queue 2201 * @done: done function to call once command is complete 2202 * 2203 * Queue a command for adapter to process. 2204 * Returns: 0 on success, else error. 2205 * Notes: io_request_lock is held, interrupts are disabled. 2206 */ 2207 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt, 2208 void (*done)(struct scsi_cmnd *)) 2209 { 2210 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2211 int result; 2212 2213 fas216_checkmagic(info); 2214 2215 fas216_log_command(info, LOG_CONNECT, SCpnt, 2216 "received command (%p)", SCpnt); 2217 2218 SCpnt->scsi_done = done; 2219 SCpnt->host_scribble = (void *)fas216_std_done; 2220 SCpnt->result = 0; 2221 2222 init_SCp(SCpnt); 2223 2224 info->stats.queues += 1; 2225 SCpnt->tag = 0; 2226 2227 spin_lock(&info->host_lock); 2228 2229 /* 2230 * Add command into execute queue and let it complete under 2231 * whatever scheme we're using. 2232 */ 2233 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt); 2234 2235 /* 2236 * If we successfully added the command, 2237 * kick the interface to get it moving. 2238 */ 2239 if (result == 0 && info->scsi.phase == PHASE_IDLE) 2240 fas216_kick(info); 2241 spin_unlock(&info->host_lock); 2242 2243 fas216_log_target(info, LOG_CONNECT, -1, "queue %s", 2244 result ? "failure" : "success"); 2245 2246 return result; 2247 } 2248 2249 DEF_SCSI_QCMD(fas216_queue_command) 2250 2251 /** 2252 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command 2253 * @SCpnt: Command to wake 2254 * 2255 * Trigger restart of a waiting thread in fas216_command 2256 */ 2257 static void fas216_internal_done(struct scsi_cmnd *SCpnt) 2258 { 2259 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2260 2261 fas216_checkmagic(info); 2262 2263 info->internal_done = 1; 2264 } 2265 2266 /** 2267 * fas216_noqueue_command - process a command for the adapter. 2268 * @SCpnt: Command to queue 2269 * 2270 * Queue a command for adapter to process. 2271 * Returns: scsi result code. 2272 * Notes: io_request_lock is held, interrupts are disabled. 2273 */ 2274 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt, 2275 void (*done)(struct scsi_cmnd *)) 2276 { 2277 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2278 2279 fas216_checkmagic(info); 2280 2281 /* 2282 * We should only be using this if we don't have an interrupt. 2283 * Provide some "incentive" to use the queueing code. 2284 */ 2285 BUG_ON(info->scsi.irq); 2286 2287 info->internal_done = 0; 2288 fas216_queue_command_lck(SCpnt, fas216_internal_done); 2289 2290 /* 2291 * This wastes time, since we can't return until the command is 2292 * complete. We can't sleep either since we may get re-entered! 2293 * However, we must re-enable interrupts, or else we'll be 2294 * waiting forever. 2295 */ 2296 spin_unlock_irq(info->host->host_lock); 2297 2298 while (!info->internal_done) { 2299 /* 2300 * If we don't have an IRQ, then we must poll the card for 2301 * it's interrupt, and use that to call this driver's 2302 * interrupt routine. That way, we keep the command 2303 * progressing. Maybe we can add some intelligence here 2304 * and go to sleep if we know that the device is going 2305 * to be some time (eg, disconnected). 2306 */ 2307 if (fas216_readb(info, REG_STAT) & STAT_INT) { 2308 spin_lock_irq(info->host->host_lock); 2309 fas216_intr(info); 2310 spin_unlock_irq(info->host->host_lock); 2311 } 2312 } 2313 2314 spin_lock_irq(info->host->host_lock); 2315 2316 done(SCpnt); 2317 2318 return 0; 2319 } 2320 2321 DEF_SCSI_QCMD(fas216_noqueue_command) 2322 2323 /* 2324 * Error handler timeout function. Indicate that we timed out, 2325 * and wake up any error handler process so it can continue. 2326 */ 2327 static void fas216_eh_timer(struct timer_list *t) 2328 { 2329 FAS216_Info *info = from_timer(info, t, eh_timer); 2330 2331 fas216_log(info, LOG_ERROR, "error handling timed out\n"); 2332 2333 del_timer(&info->eh_timer); 2334 2335 if (info->rst_bus_status == 0) 2336 info->rst_bus_status = -1; 2337 if (info->rst_dev_status == 0) 2338 info->rst_dev_status = -1; 2339 2340 wake_up(&info->eh_wait); 2341 } 2342 2343 enum res_find { 2344 res_failed, /* not found */ 2345 res_success, /* command on issue queue */ 2346 res_hw_abort /* command on disconnected dev */ 2347 }; 2348 2349 /** 2350 * fas216_do_abort - decide how to abort a command 2351 * @SCpnt: command to abort 2352 * 2353 * Decide how to abort a command. 2354 * Returns: abort status 2355 */ 2356 static enum res_find fas216_find_command(FAS216_Info *info, 2357 struct scsi_cmnd *SCpnt) 2358 { 2359 enum res_find res = res_failed; 2360 2361 if (queue_remove_cmd(&info->queues.issue, SCpnt)) { 2362 /* 2363 * The command was on the issue queue, and has not been 2364 * issued yet. We can remove the command from the queue, 2365 * and acknowledge the abort. Neither the device nor the 2366 * interface know about the command. 2367 */ 2368 printk("on issue queue "); 2369 2370 res = res_success; 2371 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) { 2372 /* 2373 * The command was on the disconnected queue. We must 2374 * reconnect with the device if possible, and send it 2375 * an abort message. 2376 */ 2377 printk("on disconnected queue "); 2378 2379 res = res_hw_abort; 2380 } else if (info->SCpnt == SCpnt) { 2381 printk("executing "); 2382 2383 switch (info->scsi.phase) { 2384 /* 2385 * If the interface is idle, and the command is 'disconnectable', 2386 * then it is the same as on the disconnected queue. 2387 */ 2388 case PHASE_IDLE: 2389 if (info->scsi.disconnectable) { 2390 info->scsi.disconnectable = 0; 2391 info->SCpnt = NULL; 2392 res = res_hw_abort; 2393 } 2394 break; 2395 2396 default: 2397 break; 2398 } 2399 } else if (info->origSCpnt == SCpnt) { 2400 /* 2401 * The command will be executed next, but a command 2402 * is currently using the interface. This is similar to 2403 * being on the issue queue, except the busylun bit has 2404 * been set. 2405 */ 2406 info->origSCpnt = NULL; 2407 clear_bit(SCpnt->device->id * 8 + 2408 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2409 printk("waiting for execution "); 2410 res = res_success; 2411 } else 2412 printk("unknown "); 2413 2414 return res; 2415 } 2416 2417 /** 2418 * fas216_eh_abort - abort this command 2419 * @SCpnt: command to abort 2420 * 2421 * Abort this command. 2422 * Returns: FAILED if unable to abort 2423 * Notes: io_request_lock is taken, and irqs are disabled 2424 */ 2425 int fas216_eh_abort(struct scsi_cmnd *SCpnt) 2426 { 2427 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2428 int result = FAILED; 2429 2430 fas216_checkmagic(info); 2431 2432 info->stats.aborts += 1; 2433 2434 scmd_printk(KERN_WARNING, SCpnt, "abort command\n"); 2435 2436 print_debug_list(); 2437 fas216_dumpstate(info); 2438 2439 switch (fas216_find_command(info, SCpnt)) { 2440 /* 2441 * We found the command, and cleared it out. Either 2442 * the command is still known to be executing on the 2443 * target, or the busylun bit is not set. 2444 */ 2445 case res_success: 2446 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt); 2447 result = SUCCESS; 2448 break; 2449 2450 /* 2451 * We need to reconnect to the target and send it an 2452 * ABORT or ABORT_TAG message. We can only do this 2453 * if the bus is free. 2454 */ 2455 case res_hw_abort: 2456 2457 /* 2458 * We are unable to abort the command for some reason. 2459 */ 2460 default: 2461 case res_failed: 2462 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt); 2463 break; 2464 } 2465 2466 return result; 2467 } 2468 2469 /** 2470 * fas216_eh_device_reset - Reset the device associated with this command 2471 * @SCpnt: command specifing device to reset 2472 * 2473 * Reset the device associated with this command. 2474 * Returns: FAILED if unable to reset. 2475 * Notes: We won't be re-entered, so we'll only have one device 2476 * reset on the go at one time. 2477 */ 2478 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt) 2479 { 2480 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2481 unsigned long flags; 2482 int i, res = FAILED, target = SCpnt->device->id; 2483 2484 fas216_log(info, LOG_ERROR, "device reset for target %d", target); 2485 2486 spin_lock_irqsave(&info->host_lock, flags); 2487 2488 do { 2489 /* 2490 * If we are currently connected to a device, and 2491 * it is the device we want to reset, there is 2492 * nothing we can do here. Chances are it is stuck, 2493 * and we need a bus reset. 2494 */ 2495 if (info->SCpnt && !info->scsi.disconnectable && 2496 info->SCpnt->device->id == SCpnt->device->id) 2497 break; 2498 2499 /* 2500 * We're going to be resetting this device. Remove 2501 * all pending commands from the driver. By doing 2502 * so, we guarantee that we won't touch the command 2503 * structures except to process the reset request. 2504 */ 2505 queue_remove_all_target(&info->queues.issue, target); 2506 queue_remove_all_target(&info->queues.disconnected, target); 2507 if (info->origSCpnt && info->origSCpnt->device->id == target) 2508 info->origSCpnt = NULL; 2509 if (info->reqSCpnt && info->reqSCpnt->device->id == target) 2510 info->reqSCpnt = NULL; 2511 for (i = 0; i < 8; i++) 2512 clear_bit(target * 8 + i, info->busyluns); 2513 2514 /* 2515 * Hijack this SCSI command structure to send 2516 * a bus device reset message to this device. 2517 */ 2518 SCpnt->host_scribble = (void *)fas216_devicereset_done; 2519 2520 info->rst_dev_status = 0; 2521 info->rstSCpnt = SCpnt; 2522 2523 if (info->scsi.phase == PHASE_IDLE) 2524 fas216_kick(info); 2525 2526 mod_timer(&info->eh_timer, jiffies + 30 * HZ); 2527 spin_unlock_irqrestore(&info->host_lock, flags); 2528 2529 /* 2530 * Wait up to 30 seconds for the reset to complete. 2531 */ 2532 wait_event(info->eh_wait, info->rst_dev_status); 2533 2534 del_timer_sync(&info->eh_timer); 2535 spin_lock_irqsave(&info->host_lock, flags); 2536 info->rstSCpnt = NULL; 2537 2538 if (info->rst_dev_status == 1) 2539 res = SUCCESS; 2540 } while (0); 2541 2542 SCpnt->host_scribble = NULL; 2543 spin_unlock_irqrestore(&info->host_lock, flags); 2544 2545 fas216_log(info, LOG_ERROR, "device reset complete: %s\n", 2546 res == SUCCESS ? "success" : "failed"); 2547 2548 return res; 2549 } 2550 2551 /** 2552 * fas216_eh_bus_reset - Reset the bus associated with the command 2553 * @SCpnt: command specifing bus to reset 2554 * 2555 * Reset the bus associated with the command. 2556 * Returns: FAILED if unable to reset. 2557 * Notes: Further commands are blocked. 2558 */ 2559 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt) 2560 { 2561 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2562 unsigned long flags; 2563 struct scsi_device *SDpnt; 2564 2565 fas216_checkmagic(info); 2566 fas216_log(info, LOG_ERROR, "resetting bus"); 2567 2568 info->stats.bus_resets += 1; 2569 2570 spin_lock_irqsave(&info->host_lock, flags); 2571 2572 /* 2573 * Stop all activity on this interface. 2574 */ 2575 fas216_aborttransfer(info); 2576 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2577 2578 /* 2579 * Clear any pending interrupts. 2580 */ 2581 while (fas216_readb(info, REG_STAT) & STAT_INT) 2582 fas216_readb(info, REG_INST); 2583 2584 info->rst_bus_status = 0; 2585 2586 /* 2587 * For each attached hard-reset device, clear out 2588 * all command structures. Leave the running 2589 * command in place. 2590 */ 2591 shost_for_each_device(SDpnt, info->host) { 2592 int i; 2593 2594 if (SDpnt->soft_reset) 2595 continue; 2596 2597 queue_remove_all_target(&info->queues.issue, SDpnt->id); 2598 queue_remove_all_target(&info->queues.disconnected, SDpnt->id); 2599 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id) 2600 info->origSCpnt = NULL; 2601 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id) 2602 info->reqSCpnt = NULL; 2603 info->SCpnt = NULL; 2604 2605 for (i = 0; i < 8; i++) 2606 clear_bit(SDpnt->id * 8 + i, info->busyluns); 2607 } 2608 2609 info->scsi.phase = PHASE_IDLE; 2610 2611 /* 2612 * Reset the SCSI bus. Device cleanup happens in 2613 * the interrupt handler. 2614 */ 2615 fas216_cmd(info, CMD_RESETSCSI); 2616 2617 mod_timer(&info->eh_timer, jiffies + HZ); 2618 spin_unlock_irqrestore(&info->host_lock, flags); 2619 2620 /* 2621 * Wait one second for the interrupt. 2622 */ 2623 wait_event(info->eh_wait, info->rst_bus_status); 2624 del_timer_sync(&info->eh_timer); 2625 2626 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n", 2627 info->rst_bus_status == 1 ? "success" : "failed"); 2628 2629 return info->rst_bus_status == 1 ? SUCCESS : FAILED; 2630 } 2631 2632 /** 2633 * fas216_init_chip - Initialise FAS216 state after reset 2634 * @info: state structure for interface 2635 * 2636 * Initialise FAS216 state after reset 2637 */ 2638 static void fas216_init_chip(FAS216_Info *info) 2639 { 2640 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7; 2641 fas216_writeb(info, REG_CLKF, clock); 2642 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2643 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]); 2644 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2645 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 2646 fas216_writeb(info, REG_SOF, 0); 2647 fas216_writeb(info, REG_STP, info->scsi.async_stp); 2648 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2649 } 2650 2651 /** 2652 * fas216_eh_host_reset - Reset the host associated with this command 2653 * @SCpnt: command specifing host to reset 2654 * 2655 * Reset the host associated with this command. 2656 * Returns: FAILED if unable to reset. 2657 * Notes: io_request_lock is taken, and irqs are disabled 2658 */ 2659 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt) 2660 { 2661 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2662 2663 spin_lock_irq(info->host->host_lock); 2664 2665 fas216_checkmagic(info); 2666 2667 fas216_log(info, LOG_ERROR, "resetting host"); 2668 2669 /* 2670 * Reset the SCSI chip. 2671 */ 2672 fas216_cmd(info, CMD_RESETCHIP); 2673 2674 /* 2675 * Ugly ugly ugly! 2676 * We need to release the host_lock and enable 2677 * IRQs if we sleep, but we must relock and disable 2678 * IRQs after the sleep. 2679 */ 2680 spin_unlock_irq(info->host->host_lock); 2681 msleep(50 * 1000/100); 2682 spin_lock_irq(info->host->host_lock); 2683 2684 /* 2685 * Release the SCSI reset. 2686 */ 2687 fas216_cmd(info, CMD_NOP); 2688 2689 fas216_init_chip(info); 2690 2691 spin_unlock_irq(info->host->host_lock); 2692 return SUCCESS; 2693 } 2694 2695 #define TYPE_UNKNOWN 0 2696 #define TYPE_NCR53C90 1 2697 #define TYPE_NCR53C90A 2 2698 #define TYPE_NCR53C9x 3 2699 #define TYPE_Am53CF94 4 2700 #define TYPE_EmFAS216 5 2701 #define TYPE_QLFAS216 6 2702 2703 static char *chip_types[] = { 2704 "unknown", 2705 "NS NCR53C90", 2706 "NS NCR53C90A", 2707 "NS NCR53C9x", 2708 "AMD Am53CF94", 2709 "Emulex FAS216", 2710 "QLogic FAS216" 2711 }; 2712 2713 static int fas216_detect_type(FAS216_Info *info) 2714 { 2715 int family, rev; 2716 2717 /* 2718 * Reset the chip. 2719 */ 2720 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2721 udelay(50); 2722 fas216_writeb(info, REG_CMD, CMD_NOP); 2723 2724 /* 2725 * Check to see if control reg 2 is present. 2726 */ 2727 fas216_writeb(info, REG_CNTL3, 0); 2728 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE); 2729 2730 /* 2731 * If we are unable to read back control reg 2 2732 * correctly, it is not present, and we have a 2733 * NCR53C90. 2734 */ 2735 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE) 2736 return TYPE_NCR53C90; 2737 2738 /* 2739 * Now, check control register 3 2740 */ 2741 fas216_writeb(info, REG_CNTL2, 0); 2742 fas216_writeb(info, REG_CNTL3, 0); 2743 fas216_writeb(info, REG_CNTL3, 5); 2744 2745 /* 2746 * If we are unable to read the register back 2747 * correctly, we have a NCR53C90A 2748 */ 2749 if (fas216_readb(info, REG_CNTL3) != 5) 2750 return TYPE_NCR53C90A; 2751 2752 /* 2753 * Now read the ID from the chip. 2754 */ 2755 fas216_writeb(info, REG_CNTL3, 0); 2756 2757 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK); 2758 fas216_writeb(info, REG_CNTL3, 0); 2759 2760 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2761 udelay(50); 2762 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP); 2763 2764 fas216_writeb(info, REG_CNTL2, CNTL2_ENF); 2765 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2766 udelay(50); 2767 fas216_writeb(info, REG_CMD, CMD_NOP); 2768 2769 rev = fas216_readb(info, REG_ID); 2770 family = rev >> 3; 2771 rev &= 7; 2772 2773 switch (family) { 2774 case 0x01: 2775 if (rev == 4) 2776 return TYPE_Am53CF94; 2777 break; 2778 2779 case 0x02: 2780 switch (rev) { 2781 case 2: 2782 return TYPE_EmFAS216; 2783 case 3: 2784 return TYPE_QLFAS216; 2785 } 2786 break; 2787 2788 default: 2789 break; 2790 } 2791 printk("family %x rev %x\n", family, rev); 2792 return TYPE_NCR53C9x; 2793 } 2794 2795 /** 2796 * fas216_reset_state - Initialise driver internal state 2797 * @info: state to initialise 2798 * 2799 * Initialise driver internal state 2800 */ 2801 static void fas216_reset_state(FAS216_Info *info) 2802 { 2803 int i; 2804 2805 fas216_checkmagic(info); 2806 2807 fas216_bus_reset(info); 2808 2809 /* 2810 * Clear out all stale info in our state structure 2811 */ 2812 memset(info->busyluns, 0, sizeof(info->busyluns)); 2813 info->scsi.disconnectable = 0; 2814 info->scsi.aborting = 0; 2815 2816 for (i = 0; i < 8; i++) { 2817 info->device[i].parity_enabled = 0; 2818 info->device[i].parity_check = 1; 2819 } 2820 2821 /* 2822 * Drain all commands on disconnected queue 2823 */ 2824 while (queue_remove(&info->queues.disconnected) != NULL); 2825 2826 /* 2827 * Remove executing commands. 2828 */ 2829 info->SCpnt = NULL; 2830 info->reqSCpnt = NULL; 2831 info->rstSCpnt = NULL; 2832 info->origSCpnt = NULL; 2833 } 2834 2835 /** 2836 * fas216_init - initialise FAS/NCR/AMD SCSI structures. 2837 * @host: a driver-specific filled-out structure 2838 * 2839 * Initialise FAS/NCR/AMD SCSI structures. 2840 * Returns: 0 on success 2841 */ 2842 int fas216_init(struct Scsi_Host *host) 2843 { 2844 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2845 2846 info->magic_start = MAGIC; 2847 info->magic_end = MAGIC; 2848 info->host = host; 2849 info->scsi.cfg[0] = host->this_id | CNTL1_PERE; 2850 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE; 2851 info->scsi.cfg[2] = info->ifcfg.cntl3 | 2852 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM; 2853 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod); 2854 2855 info->rst_dev_status = -1; 2856 info->rst_bus_status = -1; 2857 init_waitqueue_head(&info->eh_wait); 2858 timer_setup(&info->eh_timer, fas216_eh_timer, 0); 2859 2860 spin_lock_init(&info->host_lock); 2861 2862 memset(&info->stats, 0, sizeof(info->stats)); 2863 2864 msgqueue_initialise(&info->scsi.msgs); 2865 2866 if (!queue_initialise(&info->queues.issue)) 2867 return -ENOMEM; 2868 2869 if (!queue_initialise(&info->queues.disconnected)) { 2870 queue_free(&info->queues.issue); 2871 return -ENOMEM; 2872 } 2873 2874 return 0; 2875 } 2876 2877 /** 2878 * fas216_add - initialise FAS/NCR/AMD SCSI ic. 2879 * @host: a driver-specific filled-out structure 2880 * @dev: parent device 2881 * 2882 * Initialise FAS/NCR/AMD SCSI ic. 2883 * Returns: 0 on success 2884 */ 2885 int fas216_add(struct Scsi_Host *host, struct device *dev) 2886 { 2887 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2888 int type, ret; 2889 2890 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) { 2891 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n", 2892 info->ifcfg.clockrate); 2893 return -EINVAL; 2894 } 2895 2896 fas216_reset_state(info); 2897 type = fas216_detect_type(info); 2898 info->scsi.type = chip_types[type]; 2899 2900 udelay(300); 2901 2902 /* 2903 * Initialise the chip correctly. 2904 */ 2905 fas216_init_chip(info); 2906 2907 /* 2908 * Reset the SCSI bus. We don't want to see 2909 * the resulting reset interrupt, so mask it 2910 * out. 2911 */ 2912 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR); 2913 fas216_writeb(info, REG_CMD, CMD_RESETSCSI); 2914 2915 /* 2916 * scsi standard says wait 250ms 2917 */ 2918 spin_unlock_irq(info->host->host_lock); 2919 msleep(100*1000/100); 2920 spin_lock_irq(info->host->host_lock); 2921 2922 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2923 fas216_readb(info, REG_INST); 2924 2925 fas216_checkmagic(info); 2926 2927 ret = scsi_add_host(host, dev); 2928 if (ret) 2929 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2930 else 2931 scsi_scan_host(host); 2932 2933 return ret; 2934 } 2935 2936 void fas216_remove(struct Scsi_Host *host) 2937 { 2938 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2939 2940 fas216_checkmagic(info); 2941 scsi_remove_host(host); 2942 2943 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2944 scsi_host_put(host); 2945 } 2946 2947 /** 2948 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic. 2949 * @host: a driver-specific filled-out structure 2950 * 2951 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic. 2952 */ 2953 void fas216_release(struct Scsi_Host *host) 2954 { 2955 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2956 2957 queue_free(&info->queues.disconnected); 2958 queue_free(&info->queues.issue); 2959 } 2960 2961 void fas216_print_host(FAS216_Info *info, struct seq_file *m) 2962 { 2963 seq_printf(m, 2964 "\n" 2965 "Chip : %s\n" 2966 " Address: 0x%p\n" 2967 " IRQ : %d\n" 2968 " DMA : %d\n", 2969 info->scsi.type, info->scsi.io_base, 2970 info->scsi.irq, info->scsi.dma); 2971 } 2972 2973 void fas216_print_stats(FAS216_Info *info, struct seq_file *m) 2974 { 2975 seq_printf(m, "\n" 2976 "Command Statistics:\n" 2977 " Queued : %u\n" 2978 " Issued : %u\n" 2979 " Completed : %u\n" 2980 " Reads : %u\n" 2981 " Writes : %u\n" 2982 " Others : %u\n" 2983 " Disconnects: %u\n" 2984 " Aborts : %u\n" 2985 " Bus resets : %u\n" 2986 " Host resets: %u\n", 2987 info->stats.queues, info->stats.removes, 2988 info->stats.fins, info->stats.reads, 2989 info->stats.writes, info->stats.miscs, 2990 info->stats.disconnects, info->stats.aborts, 2991 info->stats.bus_resets, info->stats.host_resets); 2992 } 2993 2994 void fas216_print_devices(FAS216_Info *info, struct seq_file *m) 2995 { 2996 struct fas216_device *dev; 2997 struct scsi_device *scd; 2998 2999 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n"); 3000 3001 shost_for_each_device(scd, info->host) { 3002 dev = &info->device[scd->id]; 3003 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 3004 if (scd->tagged_supported) 3005 seq_printf(m, "%3sabled(%3d) ", 3006 scd->simple_tags ? "en" : "dis", 3007 scd->current_tag); 3008 else 3009 seq_puts(m, "unsupported "); 3010 3011 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis"); 3012 3013 if (dev->sof) 3014 seq_printf(m, "offset %d, %d ns\n", 3015 dev->sof, dev->period * 4); 3016 else 3017 seq_puts(m, "async\n"); 3018 } 3019 } 3020 3021 EXPORT_SYMBOL(fas216_init); 3022 EXPORT_SYMBOL(fas216_add); 3023 EXPORT_SYMBOL(fas216_queue_command); 3024 EXPORT_SYMBOL(fas216_noqueue_command); 3025 EXPORT_SYMBOL(fas216_intr); 3026 EXPORT_SYMBOL(fas216_remove); 3027 EXPORT_SYMBOL(fas216_release); 3028 EXPORT_SYMBOL(fas216_eh_abort); 3029 EXPORT_SYMBOL(fas216_eh_device_reset); 3030 EXPORT_SYMBOL(fas216_eh_bus_reset); 3031 EXPORT_SYMBOL(fas216_eh_host_reset); 3032 EXPORT_SYMBOL(fas216_print_host); 3033 EXPORT_SYMBOL(fas216_print_stats); 3034 EXPORT_SYMBOL(fas216_print_devices); 3035 3036 MODULE_AUTHOR("Russell King"); 3037 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core"); 3038 MODULE_LICENSE("GPL"); 3039