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 81 #undef DEBUG_CONNECT 82 #undef DEBUG_MESSAGES 83 84 #undef CHECK_STRUCTURE 85 86 #define LOG_CONNECT (1 << 0) 87 #define LOG_BUSSERVICE (1 << 1) 88 #define LOG_FUNCTIONDONE (1 << 2) 89 #define LOG_MESSAGES (1 << 3) 90 #define LOG_BUFFER (1 << 4) 91 #define LOG_ERROR (1 << 8) 92 93 static int level_mask = LOG_ERROR; 94 95 module_param(level_mask, int, 0644); 96 97 #ifndef MODULE 98 static int __init fas216_log_setup(char *str) 99 { 100 char *s; 101 102 level_mask = 0; 103 104 while ((s = strsep(&str, ",")) != NULL) { 105 switch (s[0]) { 106 case 'a': 107 if (strcmp(s, "all") == 0) 108 level_mask |= -1; 109 break; 110 case 'b': 111 if (strncmp(s, "bus", 3) == 0) 112 level_mask |= LOG_BUSSERVICE; 113 if (strncmp(s, "buf", 3) == 0) 114 level_mask |= LOG_BUFFER; 115 break; 116 case 'c': 117 level_mask |= LOG_CONNECT; 118 break; 119 case 'e': 120 level_mask |= LOG_ERROR; 121 break; 122 case 'm': 123 level_mask |= LOG_MESSAGES; 124 break; 125 case 'n': 126 if (strcmp(s, "none") == 0) 127 level_mask = 0; 128 break; 129 case 's': 130 level_mask |= LOG_FUNCTIONDONE; 131 break; 132 } 133 } 134 return 1; 135 } 136 137 __setup("fas216_logging=", fas216_log_setup); 138 #endif 139 140 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg) 141 { 142 unsigned int off = reg << info->scsi.io_shift; 143 return readb(info->scsi.io_base + off); 144 } 145 146 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val) 147 { 148 unsigned int off = reg << info->scsi.io_shift; 149 writeb(val, info->scsi.io_base + off); 150 } 151 152 static void fas216_dumpstate(FAS216_Info *info) 153 { 154 unsigned char is, stat, inst; 155 156 is = fas216_readb(info, REG_IS); 157 stat = fas216_readb(info, REG_STAT); 158 inst = fas216_readb(info, REG_INST); 159 160 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X" 161 " INST=%02X IS=%02X CFIS=%02X", 162 fas216_readb(info, REG_CTCL), 163 fas216_readb(info, REG_CTCM), 164 fas216_readb(info, REG_CMD), stat, inst, is, 165 fas216_readb(info, REG_CFIS)); 166 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n", 167 fas216_readb(info, REG_CNTL1), 168 fas216_readb(info, REG_CNTL2), 169 fas216_readb(info, REG_CNTL3), 170 fas216_readb(info, REG_CTCH)); 171 } 172 173 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix) 174 { 175 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s", 176 prefix, SCp->ptr, SCp->this_residual, SCp->buffer, 177 SCp->buffers_residual, suffix); 178 } 179 180 #ifdef CHECK_STRUCTURE 181 static void fas216_dumpinfo(FAS216_Info *info) 182 { 183 static int used = 0; 184 int i; 185 186 if (used++) 187 return; 188 189 printk("FAS216_Info=\n"); 190 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n", 191 info->magic_start, info->host, info->SCpnt, 192 info->origSCpnt); 193 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n", 194 info->scsi.io_shift, info->scsi.irq, 195 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2], 196 info->scsi.cfg[3]); 197 printk(" type=%p phase=%X\n", 198 info->scsi.type, info->scsi.phase); 199 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n"); 200 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n", 201 info->scsi.async_stp, 202 info->scsi.disconnectable, info->scsi.aborting); 203 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n" 204 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n", 205 info->stats.queues, info->stats.removes, info->stats.fins, 206 info->stats.reads, info->stats.writes, info->stats.miscs, 207 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets, 208 info->stats.host_resets); 209 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n", 210 info->ifcfg.clockrate, info->ifcfg.select_timeout, 211 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth); 212 for (i = 0; i < 8; i++) { 213 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n", 214 i, info->busyluns[i], i, 215 info->device[i].disconnect_ok, info->device[i].stp, 216 info->device[i].sof, info->device[i].sync_state); 217 } 218 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n", 219 info->dma.transfer_type, info->dma.setup, 220 info->dma.pseudo, info->dma.stop); 221 printk(" internal_done=%X magic_end=%lX }\n", 222 info->internal_done, info->magic_end); 223 } 224 225 static void __fas216_checkmagic(FAS216_Info *info, const char *func) 226 { 227 int corruption = 0; 228 if (info->magic_start != MAGIC) { 229 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n"); 230 corruption++; 231 } 232 if (info->magic_end != MAGIC) { 233 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n"); 234 corruption++; 235 } 236 if (corruption) { 237 fas216_dumpinfo(info); 238 panic("scsi memory space corrupted in %s", func); 239 } 240 } 241 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__) 242 #else 243 #define fas216_checkmagic(info) 244 #endif 245 246 static const char *fas216_bus_phase(int stat) 247 { 248 static const char *phases[] = { 249 "DATA OUT", "DATA IN", 250 "COMMAND", "STATUS", 251 "MISC OUT", "MISC IN", 252 "MESG OUT", "MESG IN" 253 }; 254 255 return phases[stat & STAT_BUSMASK]; 256 } 257 258 static const char *fas216_drv_phase(FAS216_Info *info) 259 { 260 static const char *phases[] = { 261 [PHASE_IDLE] = "idle", 262 [PHASE_SELECTION] = "selection", 263 [PHASE_COMMAND] = "command", 264 [PHASE_DATAOUT] = "data out", 265 [PHASE_DATAIN] = "data in", 266 [PHASE_MSGIN] = "message in", 267 [PHASE_MSGIN_DISCONNECT]= "disconnect", 268 [PHASE_MSGOUT_EXPECT] = "expect message out", 269 [PHASE_MSGOUT] = "message out", 270 [PHASE_STATUS] = "status", 271 [PHASE_DONE] = "done", 272 }; 273 274 if (info->scsi.phase < ARRAY_SIZE(phases) && 275 phases[info->scsi.phase]) 276 return phases[info->scsi.phase]; 277 return "???"; 278 } 279 280 static char fas216_target(FAS216_Info *info) 281 { 282 if (info->SCpnt) 283 return '0' + info->SCpnt->device->id; 284 else 285 return 'H'; 286 } 287 288 static void 289 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap) 290 { 291 static char buf[1024]; 292 293 vsnprintf(buf, sizeof(buf), fmt, ap); 294 printk("scsi%d.%c: %s", info->host->host_no, target, buf); 295 } 296 297 static void fas216_log_command(FAS216_Info *info, int level, 298 struct scsi_cmnd *SCpnt, char *fmt, ...) 299 { 300 va_list args; 301 302 if (level != 0 && !(level & level_mask)) 303 return; 304 305 va_start(args, fmt); 306 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args); 307 va_end(args); 308 309 scsi_print_command(SCpnt); 310 } 311 312 static void 313 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...) 314 { 315 va_list args; 316 317 if (level != 0 && !(level & level_mask)) 318 return; 319 320 if (target < 0) 321 target = 'H'; 322 else 323 target += '0'; 324 325 va_start(args, fmt); 326 fas216_do_log(info, target, fmt, args); 327 va_end(args); 328 329 printk("\n"); 330 } 331 332 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...) 333 { 334 va_list args; 335 336 if (level != 0 && !(level & level_mask)) 337 return; 338 339 va_start(args, fmt); 340 fas216_do_log(info, fas216_target(info), fmt, args); 341 va_end(args); 342 343 printk("\n"); 344 } 345 346 #define PH_SIZE 32 347 348 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE]; 349 static int ph_ptr; 350 351 static void add_debug_list(int stat, int ssr, int isr, int ph) 352 { 353 ph_list[ph_ptr].stat = stat; 354 ph_list[ph_ptr].ssr = ssr; 355 ph_list[ph_ptr].isr = isr; 356 ph_list[ph_ptr].ph = ph; 357 358 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1); 359 } 360 361 static struct { int command; void *from; } cmd_list[8]; 362 static int cmd_ptr; 363 364 static void fas216_cmd(FAS216_Info *info, unsigned int command) 365 { 366 cmd_list[cmd_ptr].command = command; 367 cmd_list[cmd_ptr].from = __builtin_return_address(0); 368 369 cmd_ptr = (cmd_ptr + 1) & 7; 370 371 fas216_writeb(info, REG_CMD, command); 372 } 373 374 static void print_debug_list(void) 375 { 376 int i; 377 378 i = ph_ptr; 379 380 printk(KERN_ERR "SCSI IRQ trail\n"); 381 do { 382 printk(" %02x:%02x:%02x:%1x", 383 ph_list[i].stat, ph_list[i].ssr, 384 ph_list[i].isr, ph_list[i].ph); 385 i = (i + 1) & (PH_SIZE - 1); 386 if (((i ^ ph_ptr) & 7) == 0) 387 printk("\n"); 388 } while (i != ph_ptr); 389 if ((i ^ ph_ptr) & 7) 390 printk("\n"); 391 392 i = cmd_ptr; 393 printk(KERN_ERR "FAS216 commands: "); 394 do { 395 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from); 396 i = (i + 1) & 7; 397 } while (i != cmd_ptr); 398 printk("\n"); 399 } 400 401 static void fas216_done(FAS216_Info *info, unsigned int result); 402 403 /** 404 * fas216_get_last_msg - retrive last message from the list 405 * @info: interface to search 406 * @pos: current fifo position 407 * 408 * Retrieve a last message from the list, using position in fifo. 409 */ 410 static inline unsigned short 411 fas216_get_last_msg(FAS216_Info *info, int pos) 412 { 413 unsigned short packed_msg = NOP; 414 struct message *msg; 415 int msgnr = 0; 416 417 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 418 if (pos >= msg->fifo) 419 break; 420 } 421 422 if (msg) { 423 if (msg->msg[0] == EXTENDED_MESSAGE) 424 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8; 425 else 426 packed_msg = msg->msg[0]; 427 } 428 429 fas216_log(info, LOG_MESSAGES, 430 "Message: %04x found at position %02x\n", packed_msg, pos); 431 432 return packed_msg; 433 } 434 435 /** 436 * fas216_syncperiod - calculate STP register value 437 * @info: state structure for interface connected to device 438 * @ns: period in ns (between subsequent bytes) 439 * 440 * Calculate value to be loaded into the STP register for a given period 441 * in ns. Returns a value suitable for REG_STP. 442 */ 443 static int fas216_syncperiod(FAS216_Info *info, int ns) 444 { 445 int value = (info->ifcfg.clockrate * ns) / 1000; 446 447 fas216_checkmagic(info); 448 449 if (value < 4) 450 value = 4; 451 else if (value > 35) 452 value = 35; 453 454 return value & 31; 455 } 456 457 /** 458 * fas216_set_sync - setup FAS216 chip for specified transfer period. 459 * @info: state structure for interface connected to device 460 * @target: target 461 * 462 * Correctly setup FAS216 chip for specified transfer period. 463 * Notes : we need to switch the chip out of FASTSCSI mode if we have 464 * a transfer period >= 200ns - otherwise the chip will violate 465 * the SCSI timings. 466 */ 467 static void fas216_set_sync(FAS216_Info *info, int target) 468 { 469 unsigned int cntl3; 470 471 fas216_writeb(info, REG_SOF, info->device[target].sof); 472 fas216_writeb(info, REG_STP, info->device[target].stp); 473 474 cntl3 = info->scsi.cfg[2]; 475 if (info->device[target].period >= (200 / 4)) 476 cntl3 = cntl3 & ~CNTL3_FASTSCSI; 477 478 fas216_writeb(info, REG_CNTL3, cntl3); 479 } 480 481 /* Synchronous transfer support 482 * 483 * Note: The SCSI II r10 spec says (5.6.12): 484 * 485 * (2) Due to historical problems with early host adapters that could 486 * not accept an SDTR message, some targets may not initiate synchronous 487 * negotiation after a power cycle as required by this standard. Host 488 * adapters that support synchronous mode may avoid the ensuing failure 489 * modes when the target is independently power cycled by initiating a 490 * synchronous negotiation on each REQUEST SENSE and INQUIRY command. 491 * This approach increases the SCSI bus overhead and is not recommended 492 * for new implementations. The correct method is to respond to an 493 * SDTR message with a MESSAGE REJECT message if the either the 494 * initiator or target devices does not support synchronous transfers 495 * or does not want to negotiate for synchronous transfers at the time. 496 * Using the correct method assures compatibility with wide data 497 * transfers and future enhancements. 498 * 499 * We will always initiate a synchronous transfer negotiation request on 500 * every INQUIRY or REQUEST SENSE message, unless the target itself has 501 * at some point performed a synchronous transfer negotiation request, or 502 * we have synchronous transfers disabled for this device. 503 */ 504 505 /** 506 * fas216_handlesync - Handle a synchronous transfer message 507 * @info: state structure for interface 508 * @msg: message from target 509 * 510 * Handle a synchronous transfer message from the target 511 */ 512 static void fas216_handlesync(FAS216_Info *info, char *msg) 513 { 514 struct fas216_device *dev = &info->device[info->SCpnt->device->id]; 515 enum { sync, async, none, reject } res = none; 516 517 #ifdef SCSI2_SYNC 518 switch (msg[0]) { 519 case MESSAGE_REJECT: 520 /* Synchronous transfer request failed. 521 * Note: SCSI II r10: 522 * 523 * SCSI devices that are capable of synchronous 524 * data transfers shall not respond to an SDTR 525 * message with a MESSAGE REJECT message. 526 * 527 * Hence, if we get this condition, we disable 528 * negotiation for this device. 529 */ 530 if (dev->sync_state == neg_inprogress) { 531 dev->sync_state = neg_invalid; 532 res = async; 533 } 534 break; 535 536 case EXTENDED_MESSAGE: 537 switch (dev->sync_state) { 538 /* We don't accept synchronous transfer requests. 539 * Respond with a MESSAGE_REJECT to prevent a 540 * synchronous transfer agreement from being reached. 541 */ 542 case neg_invalid: 543 res = reject; 544 break; 545 546 /* We were not negotiating a synchronous transfer, 547 * but the device sent us a negotiation request. 548 * Honour the request by sending back a SDTR 549 * message containing our capability, limited by 550 * the targets capability. 551 */ 552 default: 553 fas216_cmd(info, CMD_SETATN); 554 if (msg[4] > info->ifcfg.sync_max_depth) 555 msg[4] = info->ifcfg.sync_max_depth; 556 if (msg[3] < 1000 / info->ifcfg.clockrate) 557 msg[3] = 1000 / info->ifcfg.clockrate; 558 559 msgqueue_flush(&info->scsi.msgs); 560 msgqueue_addmsg(&info->scsi.msgs, 5, 561 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 562 msg[3], msg[4]); 563 info->scsi.phase = PHASE_MSGOUT_EXPECT; 564 565 /* This is wrong. The agreement is not in effect 566 * until this message is accepted by the device 567 */ 568 dev->sync_state = neg_targcomplete; 569 res = sync; 570 break; 571 572 /* We initiated the synchronous transfer negotiation, 573 * and have successfully received a response from the 574 * target. The synchronous transfer agreement has been 575 * reached. Note: if the values returned are out of our 576 * bounds, we must reject the message. 577 */ 578 case neg_inprogress: 579 res = reject; 580 if (msg[4] <= info->ifcfg.sync_max_depth && 581 msg[3] >= 1000 / info->ifcfg.clockrate) { 582 dev->sync_state = neg_complete; 583 res = sync; 584 } 585 break; 586 } 587 } 588 #else 589 res = reject; 590 #endif 591 592 switch (res) { 593 case sync: 594 dev->period = msg[3]; 595 dev->sof = msg[4]; 596 dev->stp = fas216_syncperiod(info, msg[3] * 4); 597 fas216_set_sync(info, info->SCpnt->device->id); 598 break; 599 600 case reject: 601 fas216_cmd(info, CMD_SETATN); 602 msgqueue_flush(&info->scsi.msgs); 603 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 604 info->scsi.phase = PHASE_MSGOUT_EXPECT; 605 fallthrough; 606 607 case async: 608 dev->period = info->ifcfg.asyncperiod / 4; 609 dev->sof = 0; 610 dev->stp = info->scsi.async_stp; 611 fas216_set_sync(info, info->SCpnt->device->id); 612 break; 613 614 case none: 615 break; 616 } 617 } 618 619 /** 620 * fas216_updateptrs - update data pointers after transfer suspended/paused 621 * @info: interface's local pointer to update 622 * @bytes_transferred: number of bytes transferred 623 * 624 * Update data pointers after transfer suspended/paused 625 */ 626 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred) 627 { 628 struct scsi_pointer *SCp = &info->scsi.SCp; 629 630 fas216_checkmagic(info); 631 632 BUG_ON(bytes_transferred < 0); 633 634 SCp->phase -= bytes_transferred; 635 636 while (bytes_transferred != 0) { 637 if (SCp->this_residual > bytes_transferred) 638 break; 639 /* 640 * We have used up this buffer. Move on to the 641 * next buffer. 642 */ 643 bytes_transferred -= SCp->this_residual; 644 if (!next_SCp(SCp) && bytes_transferred) { 645 printk(KERN_WARNING "scsi%d.%c: out of buffers\n", 646 info->host->host_no, '0' + info->SCpnt->device->id); 647 return; 648 } 649 } 650 651 SCp->this_residual -= bytes_transferred; 652 if (SCp->this_residual) 653 SCp->ptr += bytes_transferred; 654 else 655 SCp->ptr = NULL; 656 } 657 658 /** 659 * fas216_pio - transfer data off of/on to card using programmed IO 660 * @info: interface to transfer data to/from 661 * @direction: direction to transfer data (DMA_OUT/DMA_IN) 662 * 663 * Transfer data off of/on to card using programmed IO. 664 * Notes: this is incredibly slow. 665 */ 666 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction) 667 { 668 struct scsi_pointer *SCp = &info->scsi.SCp; 669 670 fas216_checkmagic(info); 671 672 if (direction == DMA_OUT) 673 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp)); 674 else 675 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF)); 676 677 if (SCp->this_residual == 0) 678 next_SCp(SCp); 679 } 680 681 static void fas216_set_stc(FAS216_Info *info, unsigned int length) 682 { 683 fas216_writeb(info, REG_STCL, length); 684 fas216_writeb(info, REG_STCM, length >> 8); 685 fas216_writeb(info, REG_STCH, length >> 16); 686 } 687 688 static unsigned int fas216_get_ctc(FAS216_Info *info) 689 { 690 return fas216_readb(info, REG_CTCL) + 691 (fas216_readb(info, REG_CTCM) << 8) + 692 (fas216_readb(info, REG_CTCH) << 16); 693 } 694 695 /** 696 * fas216_cleanuptransfer - clean up after a transfer has completed. 697 * @info: interface to clean up 698 * 699 * Update the data pointers according to the number of bytes transferred 700 * on the SCSI bus. 701 */ 702 static void fas216_cleanuptransfer(FAS216_Info *info) 703 { 704 unsigned long total, residual, fifo; 705 fasdmatype_t dmatype = info->dma.transfer_type; 706 707 info->dma.transfer_type = fasdma_none; 708 709 /* 710 * PIO transfers do not need to be cleaned up. 711 */ 712 if (dmatype == fasdma_pio || dmatype == fasdma_none) 713 return; 714 715 if (dmatype == fasdma_real_all) 716 total = info->scsi.SCp.phase; 717 else 718 total = info->scsi.SCp.this_residual; 719 720 residual = fas216_get_ctc(info); 721 722 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 723 724 fas216_log(info, LOG_BUFFER, "cleaning up from previous " 725 "transfer: length 0x%06x, residual 0x%x, fifo %d", 726 total, residual, fifo); 727 728 /* 729 * If we were performing Data-Out, the transfer counter 730 * counts down each time a byte is transferred by the 731 * host to the FIFO. This means we must include the 732 * bytes left in the FIFO from the transfer counter. 733 */ 734 if (info->scsi.phase == PHASE_DATAOUT) 735 residual += fifo; 736 737 fas216_updateptrs(info, total - residual); 738 } 739 740 /** 741 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card 742 * @info: interface from which device disconnected from 743 * 744 * Start a DMA/PIO transfer off of/on to card 745 */ 746 static void fas216_transfer(FAS216_Info *info) 747 { 748 fasdmadir_t direction; 749 fasdmatype_t dmatype; 750 751 fas216_log(info, LOG_BUFFER, 752 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x", 753 info->scsi.SCp.ptr, info->scsi.SCp.this_residual, 754 info->scsi.SCp.phase); 755 756 if (!info->scsi.SCp.ptr) { 757 fas216_log(info, LOG_ERROR, "null buffer passed to " 758 "fas216_starttransfer"); 759 print_SCp(&info->scsi.SCp, "SCp: ", "\n"); 760 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n"); 761 return; 762 } 763 764 /* 765 * If we have a synchronous transfer agreement in effect, we must 766 * use DMA mode. If we are using asynchronous transfers, we may 767 * use DMA mode or PIO mode. 768 */ 769 if (info->device[info->SCpnt->device->id].sof) 770 dmatype = fasdma_real_all; 771 else 772 dmatype = fasdma_pio; 773 774 if (info->scsi.phase == PHASE_DATAOUT) 775 direction = DMA_OUT; 776 else 777 direction = DMA_IN; 778 779 if (info->dma.setup) 780 dmatype = info->dma.setup(info->host, &info->scsi.SCp, 781 direction, dmatype); 782 info->dma.transfer_type = dmatype; 783 784 if (dmatype == fasdma_real_all) 785 fas216_set_stc(info, info->scsi.SCp.phase); 786 else 787 fas216_set_stc(info, info->scsi.SCp.this_residual); 788 789 switch (dmatype) { 790 case fasdma_pio: 791 fas216_log(info, LOG_BUFFER, "PIO transfer"); 792 fas216_writeb(info, REG_SOF, 0); 793 fas216_writeb(info, REG_STP, info->scsi.async_stp); 794 fas216_cmd(info, CMD_TRANSFERINFO); 795 fas216_pio(info, direction); 796 break; 797 798 case fasdma_pseudo: 799 fas216_log(info, LOG_BUFFER, "pseudo transfer"); 800 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 801 info->dma.pseudo(info->host, &info->scsi.SCp, 802 direction, info->SCpnt->transfersize); 803 break; 804 805 case fasdma_real_block: 806 fas216_log(info, LOG_BUFFER, "block dma transfer"); 807 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 808 break; 809 810 case fasdma_real_all: 811 fas216_log(info, LOG_BUFFER, "total dma transfer"); 812 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 813 break; 814 815 default: 816 fas216_log(info, LOG_BUFFER | LOG_ERROR, 817 "invalid FAS216 DMA type"); 818 break; 819 } 820 } 821 822 /** 823 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card 824 * @info: interface from which device disconnected from 825 * 826 * Called when we switch away from DATA IN or DATA OUT phases. 827 */ 828 static void fas216_stoptransfer(FAS216_Info *info) 829 { 830 fas216_checkmagic(info); 831 832 if (info->dma.transfer_type == fasdma_real_all || 833 info->dma.transfer_type == fasdma_real_block) 834 info->dma.stop(info->host, &info->scsi.SCp); 835 836 fas216_cleanuptransfer(info); 837 838 if (info->scsi.phase == PHASE_DATAIN) { 839 unsigned int fifo; 840 841 /* 842 * If we were performing Data-In, then the FIFO counter 843 * contains the number of bytes not transferred via DMA 844 * from the on-board FIFO. Read them manually. 845 */ 846 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 847 while (fifo && info->scsi.SCp.ptr) { 848 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF); 849 fas216_updateptrs(info, 1); 850 fifo--; 851 } 852 } else { 853 /* 854 * After a Data-Out phase, there may be unsent 855 * bytes left in the FIFO. Flush them out. 856 */ 857 fas216_cmd(info, CMD_FLUSHFIFO); 858 } 859 } 860 861 static void fas216_aborttransfer(FAS216_Info *info) 862 { 863 fas216_checkmagic(info); 864 865 if (info->dma.transfer_type == fasdma_real_all || 866 info->dma.transfer_type == fasdma_real_block) 867 info->dma.stop(info->host, &info->scsi.SCp); 868 869 info->dma.transfer_type = fasdma_none; 870 fas216_cmd(info, CMD_FLUSHFIFO); 871 } 872 873 static void fas216_kick(FAS216_Info *info); 874 875 /** 876 * fas216_disconnected_intr - handle device disconnection 877 * @info: interface from which device disconnected from 878 * 879 * Handle device disconnection 880 */ 881 static void fas216_disconnect_intr(FAS216_Info *info) 882 { 883 unsigned long flags; 884 885 fas216_checkmagic(info); 886 887 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x", 888 info->scsi.phase); 889 890 msgqueue_flush(&info->scsi.msgs); 891 892 switch (info->scsi.phase) { 893 case PHASE_SELECTION: /* while selecting - no target */ 894 case PHASE_SELSTEPS: 895 fas216_done(info, DID_NO_CONNECT); 896 break; 897 898 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */ 899 info->scsi.disconnectable = 1; 900 info->scsi.phase = PHASE_IDLE; 901 info->stats.disconnects += 1; 902 spin_lock_irqsave(&info->host_lock, flags); 903 if (info->scsi.phase == PHASE_IDLE) 904 fas216_kick(info); 905 spin_unlock_irqrestore(&info->host_lock, flags); 906 break; 907 908 case PHASE_DONE: /* at end of command - complete */ 909 fas216_done(info, DID_OK); 910 break; 911 912 case PHASE_MSGOUT: /* message out - possible ABORT message */ 913 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) { 914 info->scsi.aborting = 0; 915 fas216_done(info, DID_ABORT); 916 break; 917 } 918 fallthrough; 919 920 default: /* huh? */ 921 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n", 922 info->host->host_no, fas216_target(info), fas216_drv_phase(info)); 923 print_debug_list(); 924 fas216_stoptransfer(info); 925 fas216_done(info, DID_ERROR); 926 break; 927 } 928 } 929 930 /** 931 * fas216_reselected_intr - start reconnection of a device 932 * @info: interface which was reselected 933 * 934 * Start reconnection of a device 935 */ 936 static void 937 fas216_reselected_intr(FAS216_Info *info) 938 { 939 unsigned int cfis, i; 940 unsigned char msg[4]; 941 unsigned char target, lun, tag; 942 943 fas216_checkmagic(info); 944 945 WARN_ON(info->scsi.phase == PHASE_SELECTION || 946 info->scsi.phase == PHASE_SELSTEPS); 947 948 cfis = fas216_readb(info, REG_CFIS); 949 950 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x", 951 info->scsi.phase, cfis); 952 953 cfis &= CFIS_CF; 954 955 if (cfis < 2 || cfis > 4) { 956 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n", 957 info->host->host_no); 958 goto bad_message; 959 } 960 961 for (i = 0; i < cfis; i++) 962 msg[i] = fas216_readb(info, REG_FF); 963 964 if (!(msg[0] & (1 << info->host->this_id)) || 965 !(msg[1] & 0x80)) 966 goto initiator_error; 967 968 target = msg[0] & ~(1 << info->host->this_id); 969 target = ffs(target) - 1; 970 lun = msg[1] & 7; 971 tag = 0; 972 973 if (cfis >= 3) { 974 if (msg[2] != SIMPLE_QUEUE_TAG) 975 goto initiator_error; 976 977 tag = msg[3]; 978 } 979 980 /* set up for synchronous transfers */ 981 fas216_writeb(info, REG_SDID, target); 982 fas216_set_sync(info, target); 983 msgqueue_flush(&info->scsi.msgs); 984 985 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x", 986 target, lun, tag); 987 988 if (info->scsi.disconnectable && info->SCpnt) { 989 info->scsi.disconnectable = 0; 990 if (info->SCpnt->device->id == target && 991 info->SCpnt->device->lun == lun && 992 scsi_cmd_to_rq(info->SCpnt)->tag == tag) { 993 fas216_log(info, LOG_CONNECT, "reconnected previously executing command"); 994 } else { 995 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 996 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue"); 997 info->SCpnt = NULL; 998 } 999 } 1000 if (!info->SCpnt) { 1001 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected, 1002 target, lun, tag); 1003 fas216_log(info, LOG_CONNECT, "had to get command"); 1004 } 1005 1006 if (info->SCpnt) { 1007 /* 1008 * Restore data pointer from SAVED data pointer 1009 */ 1010 info->scsi.SCp = info->SCpnt->SCp; 1011 1012 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]", 1013 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1014 info->scsi.phase = PHASE_MSGIN; 1015 } else { 1016 /* 1017 * Our command structure not found - abort the 1018 * command on the target. Since we have no 1019 * record of this command, we can't send 1020 * an INITIATOR DETECTED ERROR message. 1021 */ 1022 fas216_cmd(info, CMD_SETATN); 1023 1024 #if 0 1025 if (tag) 1026 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag); 1027 else 1028 #endif 1029 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT); 1030 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1031 info->scsi.aborting = 1; 1032 } 1033 1034 fas216_cmd(info, CMD_MSGACCEPTED); 1035 return; 1036 1037 initiator_error: 1038 printk(KERN_ERR "scsi%d.H: error during reselection: bytes", 1039 info->host->host_no); 1040 for (i = 0; i < cfis; i++) 1041 printk(" %02x", msg[i]); 1042 printk("\n"); 1043 bad_message: 1044 fas216_cmd(info, CMD_SETATN); 1045 msgqueue_flush(&info->scsi.msgs); 1046 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1047 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1048 fas216_cmd(info, CMD_MSGACCEPTED); 1049 } 1050 1051 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen) 1052 { 1053 int i; 1054 1055 switch (message[0]) { 1056 case COMMAND_COMPLETE: 1057 if (msglen != 1) 1058 goto unrecognised; 1059 1060 printk(KERN_ERR "scsi%d.%c: command complete with no " 1061 "status in MESSAGE_IN?\n", 1062 info->host->host_no, fas216_target(info)); 1063 break; 1064 1065 case SAVE_POINTERS: 1066 if (msglen != 1) 1067 goto unrecognised; 1068 1069 /* 1070 * Save current data pointer to SAVED data pointer 1071 * SCSI II standard says that we must not acknowledge 1072 * this until we have really saved pointers. 1073 * NOTE: we DO NOT save the command nor status pointers 1074 * as required by the SCSI II standard. These always 1075 * point to the start of their respective areas. 1076 */ 1077 info->SCpnt->SCp = info->scsi.SCp; 1078 info->SCpnt->SCp.sent_command = 0; 1079 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1080 "save data pointers: [%p, %X]", 1081 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1082 break; 1083 1084 case RESTORE_POINTERS: 1085 if (msglen != 1) 1086 goto unrecognised; 1087 1088 /* 1089 * Restore current data pointer from SAVED data pointer 1090 */ 1091 info->scsi.SCp = info->SCpnt->SCp; 1092 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1093 "restore data pointers: [%p, 0x%x]", 1094 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1095 break; 1096 1097 case DISCONNECT: 1098 if (msglen != 1) 1099 goto unrecognised; 1100 1101 info->scsi.phase = PHASE_MSGIN_DISCONNECT; 1102 break; 1103 1104 case MESSAGE_REJECT: 1105 if (msglen != 1) 1106 goto unrecognised; 1107 1108 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) { 1109 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8: 1110 fas216_handlesync(info, message); 1111 break; 1112 1113 default: 1114 fas216_log(info, 0, "reject, last message 0x%04x", 1115 fas216_get_last_msg(info, info->scsi.msgin_fifo)); 1116 } 1117 break; 1118 1119 case NOP: 1120 break; 1121 1122 case EXTENDED_MESSAGE: 1123 if (msglen < 3) 1124 goto unrecognised; 1125 1126 switch (message[2]) { 1127 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */ 1128 fas216_handlesync(info, message); 1129 break; 1130 1131 default: 1132 goto unrecognised; 1133 } 1134 break; 1135 1136 default: 1137 goto unrecognised; 1138 } 1139 return; 1140 1141 unrecognised: 1142 fas216_log(info, 0, "unrecognised message, rejecting"); 1143 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info)); 1144 for (i = 0; i < msglen; i++) 1145 printk("%s%02X", i & 31 ? " " : "\n ", message[i]); 1146 printk("\n"); 1147 1148 /* 1149 * Something strange seems to be happening here - 1150 * I can't use SETATN since the chip gives me an 1151 * invalid command interrupt when I do. Weird. 1152 */ 1153 fas216_cmd(info, CMD_NOP); 1154 fas216_dumpstate(info); 1155 fas216_cmd(info, CMD_SETATN); 1156 msgqueue_flush(&info->scsi.msgs); 1157 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 1158 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1159 fas216_dumpstate(info); 1160 } 1161 1162 static int fas216_wait_cmd(FAS216_Info *info, int cmd) 1163 { 1164 int tout; 1165 int stat; 1166 1167 fas216_cmd(info, cmd); 1168 1169 for (tout = 1000; tout; tout -= 1) { 1170 stat = fas216_readb(info, REG_STAT); 1171 if (stat & (STAT_INT|STAT_PARITYERROR)) 1172 break; 1173 udelay(1); 1174 } 1175 1176 return stat; 1177 } 1178 1179 static int fas216_get_msg_byte(FAS216_Info *info) 1180 { 1181 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED); 1182 1183 if ((stat & STAT_INT) == 0) 1184 goto timedout; 1185 1186 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1187 goto unexpected_phase_change; 1188 1189 fas216_readb(info, REG_INST); 1190 1191 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO); 1192 1193 if ((stat & STAT_INT) == 0) 1194 goto timedout; 1195 1196 if (stat & STAT_PARITYERROR) 1197 goto parity_error; 1198 1199 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1200 goto unexpected_phase_change; 1201 1202 fas216_readb(info, REG_INST); 1203 1204 return fas216_readb(info, REG_FF); 1205 1206 timedout: 1207 fas216_log(info, LOG_ERROR, "timed out waiting for message byte"); 1208 return -1; 1209 1210 unexpected_phase_change: 1211 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat); 1212 return -2; 1213 1214 parity_error: 1215 fas216_log(info, LOG_ERROR, "parity error during message in phase"); 1216 return -3; 1217 } 1218 1219 /** 1220 * fas216_message - handle a function done interrupt from FAS216 chip 1221 * @info: interface which caused function done interrupt 1222 * 1223 * Handle a function done interrupt from FAS216 chip 1224 */ 1225 static void fas216_message(FAS216_Info *info) 1226 { 1227 unsigned char *message = info->scsi.message; 1228 unsigned int msglen = 1; 1229 int msgbyte = 0; 1230 1231 fas216_checkmagic(info); 1232 1233 message[0] = fas216_readb(info, REG_FF); 1234 1235 if (message[0] == EXTENDED_MESSAGE) { 1236 msgbyte = fas216_get_msg_byte(info); 1237 1238 if (msgbyte >= 0) { 1239 message[1] = msgbyte; 1240 1241 for (msglen = 2; msglen < message[1] + 2; msglen++) { 1242 msgbyte = fas216_get_msg_byte(info); 1243 1244 if (msgbyte >= 0) 1245 message[msglen] = msgbyte; 1246 else 1247 break; 1248 } 1249 } 1250 } 1251 1252 if (msgbyte == -3) 1253 goto parity_error; 1254 1255 #ifdef DEBUG_MESSAGES 1256 { 1257 int i; 1258 1259 printk("scsi%d.%c: message in: ", 1260 info->host->host_no, fas216_target(info)); 1261 for (i = 0; i < msglen; i++) 1262 printk("%02X ", message[i]); 1263 printk("\n"); 1264 } 1265 #endif 1266 1267 fas216_parse_message(info, message, msglen); 1268 fas216_cmd(info, CMD_MSGACCEPTED); 1269 return; 1270 1271 parity_error: 1272 fas216_cmd(info, CMD_SETATN); 1273 msgqueue_flush(&info->scsi.msgs); 1274 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR); 1275 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1276 fas216_cmd(info, CMD_MSGACCEPTED); 1277 return; 1278 } 1279 1280 /** 1281 * fas216_send_command - send command after all message bytes have been sent 1282 * @info: interface which caused bus service 1283 * 1284 * Send a command to a target after all message bytes have been sent 1285 */ 1286 static void fas216_send_command(FAS216_Info *info) 1287 { 1288 int i; 1289 1290 fas216_checkmagic(info); 1291 1292 fas216_cmd(info, CMD_NOP|CMD_WITHDMA); 1293 fas216_cmd(info, CMD_FLUSHFIFO); 1294 1295 /* load command */ 1296 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++) 1297 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]); 1298 1299 fas216_cmd(info, CMD_TRANSFERINFO); 1300 1301 info->scsi.phase = PHASE_COMMAND; 1302 } 1303 1304 /** 1305 * fas216_send_messageout - handle bus service to send a message 1306 * @info: interface which caused bus service 1307 * 1308 * Handle bus service to send a message. 1309 * Note: We do not allow the device to change the data direction! 1310 */ 1311 static void fas216_send_messageout(FAS216_Info *info, int start) 1312 { 1313 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1314 1315 fas216_checkmagic(info); 1316 1317 fas216_cmd(info, CMD_FLUSHFIFO); 1318 1319 if (tot_msglen) { 1320 struct message *msg; 1321 int msgnr = 0; 1322 1323 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1324 int i; 1325 1326 for (i = start; i < msg->length; i++) 1327 fas216_writeb(info, REG_FF, msg->msg[i]); 1328 1329 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1330 start = 0; 1331 } 1332 } else 1333 fas216_writeb(info, REG_FF, NOP); 1334 1335 fas216_cmd(info, CMD_TRANSFERINFO); 1336 1337 info->scsi.phase = PHASE_MSGOUT; 1338 } 1339 1340 /** 1341 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip 1342 * @info: interface which caused bus service interrupt 1343 * @stat: Status register contents 1344 * @is: SCSI Status register contents 1345 * 1346 * Handle a bus service interrupt from FAS216 chip 1347 */ 1348 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1349 { 1350 fas216_checkmagic(info); 1351 1352 fas216_log(info, LOG_BUSSERVICE, 1353 "bus service: stat=%02x is=%02x phase=%02x", 1354 stat, is, info->scsi.phase); 1355 1356 switch (info->scsi.phase) { 1357 case PHASE_SELECTION: 1358 if ((is & IS_BITS) != IS_MSGBYTESENT) 1359 goto bad_is; 1360 break; 1361 1362 case PHASE_SELSTEPS: 1363 switch (is & IS_BITS) { 1364 case IS_SELARB: 1365 case IS_MSGBYTESENT: 1366 goto bad_is; 1367 1368 case IS_NOTCOMMAND: 1369 case IS_EARLYPHASE: 1370 if ((stat & STAT_BUSMASK) == STAT_MESGIN) 1371 break; 1372 goto bad_is; 1373 1374 case IS_COMPLETE: 1375 break; 1376 } 1377 break; 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->device->simple_tags) 1794 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, 1795 scsi_cmd_to_rq(SCpnt)->tag); 1796 1797 do { 1798 #ifdef SCSI2_SYNC 1799 if ((info->device[SCpnt->device->id].sync_state == neg_wait || 1800 info->device[SCpnt->device->id].sync_state == neg_complete) && 1801 (SCpnt->cmnd[0] == REQUEST_SENSE || 1802 SCpnt->cmnd[0] == INQUIRY)) { 1803 info->device[SCpnt->device->id].sync_state = neg_inprogress; 1804 msgqueue_addmsg(&info->scsi.msgs, 5, 1805 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1806 1000 / info->ifcfg.clockrate, 1807 info->ifcfg.sync_max_depth); 1808 break; 1809 } 1810 #endif 1811 } while (0); 1812 1813 __fas216_start_command(info, SCpnt); 1814 } 1815 1816 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1817 { 1818 set_bit(SCpnt->device->id * 8 + 1819 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 1820 1821 info->stats.removes += 1; 1822 switch (SCpnt->cmnd[0]) { 1823 case WRITE_6: 1824 case WRITE_10: 1825 case WRITE_12: 1826 info->stats.writes += 1; 1827 break; 1828 case READ_6: 1829 case READ_10: 1830 case READ_12: 1831 info->stats.reads += 1; 1832 break; 1833 default: 1834 info->stats.miscs += 1; 1835 break; 1836 } 1837 } 1838 1839 static void fas216_do_bus_device_reset(FAS216_Info *info, 1840 struct scsi_cmnd *SCpnt) 1841 { 1842 struct message *msg; 1843 1844 /* 1845 * claim host busy 1846 */ 1847 info->scsi.phase = PHASE_SELECTION; 1848 info->scsi.SCp = SCpnt->SCp; 1849 info->SCpnt = SCpnt; 1850 info->dma.transfer_type = fasdma_none; 1851 1852 fas216_log(info, LOG_ERROR, "sending bus device reset"); 1853 1854 msgqueue_flush(&info->scsi.msgs); 1855 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET); 1856 1857 /* following what the ESP driver says */ 1858 fas216_set_stc(info, 0); 1859 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1860 1861 /* flush FIFO */ 1862 fas216_cmd(info, CMD_FLUSHFIFO); 1863 1864 /* load bus-id and timeout */ 1865 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1866 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1867 1868 /* synchronous transfers */ 1869 fas216_set_sync(info, SCpnt->device->id); 1870 1871 msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1872 1873 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET); 1874 msg->fifo = 1; 1875 1876 fas216_cmd(info, CMD_SELECTATNSTOP); 1877 } 1878 1879 /** 1880 * fas216_kick - kick a command to the interface 1881 * @info: our host interface to kick 1882 * 1883 * Kick a command to the interface, interface should be idle. 1884 * Notes: Interrupts are always disabled! 1885 */ 1886 static void fas216_kick(FAS216_Info *info) 1887 { 1888 struct scsi_cmnd *SCpnt = NULL; 1889 #define TYPE_OTHER 0 1890 #define TYPE_RESET 1 1891 #define TYPE_QUEUE 2 1892 int where_from = TYPE_OTHER; 1893 1894 fas216_checkmagic(info); 1895 1896 /* 1897 * Obtain the next command to process. 1898 */ 1899 do { 1900 if (info->rstSCpnt) { 1901 SCpnt = info->rstSCpnt; 1902 /* don't remove it */ 1903 where_from = TYPE_RESET; 1904 break; 1905 } 1906 1907 if (info->reqSCpnt) { 1908 SCpnt = info->reqSCpnt; 1909 info->reqSCpnt = NULL; 1910 break; 1911 } 1912 1913 if (info->origSCpnt) { 1914 SCpnt = info->origSCpnt; 1915 info->origSCpnt = NULL; 1916 break; 1917 } 1918 1919 /* retrieve next command */ 1920 if (!SCpnt) { 1921 SCpnt = queue_remove_exclude(&info->queues.issue, 1922 info->busyluns); 1923 where_from = TYPE_QUEUE; 1924 break; 1925 } 1926 } while (0); 1927 1928 if (!SCpnt) { 1929 /* 1930 * no command pending, so enable reselection. 1931 */ 1932 fas216_cmd(info, CMD_ENABLESEL); 1933 return; 1934 } 1935 1936 /* 1937 * We're going to start a command, so disable reselection 1938 */ 1939 fas216_cmd(info, CMD_DISABLESEL); 1940 1941 if (info->scsi.disconnectable && info->SCpnt) { 1942 fas216_log(info, LOG_CONNECT, 1943 "moved command for %d to disconnected queue", 1944 info->SCpnt->device->id); 1945 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 1946 info->scsi.disconnectable = 0; 1947 info->SCpnt = NULL; 1948 } 1949 1950 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt, 1951 "starting"); 1952 1953 switch (where_from) { 1954 case TYPE_QUEUE: 1955 fas216_allocate_tag(info, SCpnt); 1956 fallthrough; 1957 case TYPE_OTHER: 1958 fas216_start_command(info, SCpnt); 1959 break; 1960 case TYPE_RESET: 1961 fas216_do_bus_device_reset(info, SCpnt); 1962 break; 1963 } 1964 1965 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]", 1966 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1967 1968 /* 1969 * should now get either DISCONNECT or 1970 * (FUNCTION DONE with BUS SERVICE) interrupt 1971 */ 1972 } 1973 1974 /* 1975 * Clean up from issuing a BUS DEVICE RESET message to a device. 1976 */ 1977 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 1978 unsigned int result) 1979 { 1980 fas216_log(info, LOG_ERROR, "fas216 device reset complete"); 1981 1982 info->rstSCpnt = NULL; 1983 info->rst_dev_status = 1; 1984 wake_up(&info->eh_wait); 1985 } 1986 1987 /** 1988 * fas216_rq_sns_done - Finish processing automatic request sense command 1989 * @info: interface that completed 1990 * @SCpnt: command that completed 1991 * @result: driver byte of result 1992 * 1993 * Finish processing automatic request sense command 1994 */ 1995 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 1996 unsigned int result) 1997 { 1998 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 1999 "request sense complete, result=0x%04x%02x%02x", 2000 result, SCpnt->SCp.Message, SCpnt->SCp.Status); 2001 2002 if (result != DID_OK || SCpnt->SCp.Status != SAM_STAT_GOOD) 2003 /* 2004 * Something went wrong. Make sure that we don't 2005 * have valid data in the sense buffer that could 2006 * confuse the higher levels. 2007 */ 2008 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2009 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id); 2010 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); } 2011 /* 2012 * Note that we don't set SCpnt->result, since that should 2013 * reflect the status of the command that we were asked by 2014 * the upper layers to process. This would have been set 2015 * correctly by fas216_std_done. 2016 */ 2017 scsi_eh_restore_cmnd(SCpnt, &info->ses); 2018 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt); 2019 } 2020 2021 /** 2022 * fas216_std_done - finish processing of standard command 2023 * @info: interface that completed 2024 * @SCpnt: command that completed 2025 * @result: driver byte of result 2026 * 2027 * Finish processing of standard command 2028 */ 2029 static void 2030 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) 2031 { 2032 info->stats.fins += 1; 2033 2034 set_host_byte(SCpnt, result); 2035 if (result == DID_OK) 2036 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message); 2037 set_status_byte(SCpnt, info->scsi.SCp.Status); 2038 2039 fas216_log_command(info, LOG_CONNECT, SCpnt, 2040 "command complete, result=0x%08x", SCpnt->result); 2041 2042 /* 2043 * If the driver detected an error, we're all done. 2044 */ 2045 if (get_host_byte(SCpnt) != DID_OK) 2046 goto done; 2047 2048 /* 2049 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED 2050 * status, request the sense information. 2051 */ 2052 if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION || 2053 get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED) 2054 goto request_sense; 2055 2056 /* 2057 * If the command did not complete with GOOD status, 2058 * we are all done here. 2059 */ 2060 if (get_status_byte(SCpnt) != SAM_STAT_GOOD) 2061 goto done; 2062 2063 /* 2064 * We have successfully completed a command. Make sure that 2065 * we do not have any buffers left to transfer. The world 2066 * is not perfect, and we seem to occasionally hit this. 2067 * It can be indicative of a buggy driver, target or the upper 2068 * levels of the SCSI code. 2069 */ 2070 if (info->scsi.SCp.ptr) { 2071 switch (SCpnt->cmnd[0]) { 2072 case INQUIRY: 2073 case START_STOP: 2074 case MODE_SENSE: 2075 break; 2076 2077 default: 2078 scmd_printk(KERN_ERR, SCpnt, 2079 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n", 2080 SCpnt->result, info->scsi.SCp.ptr, 2081 info->scsi.SCp.this_residual); 2082 scsi_print_command(SCpnt); 2083 set_host_byte(SCpnt, DID_ERROR); 2084 goto request_sense; 2085 } 2086 } 2087 2088 done: 2089 if (fas216_cmd_priv(SCpnt)->scsi_done) { 2090 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt); 2091 return; 2092 } 2093 2094 panic("scsi%d.H: null scsi_done function in fas216_done", 2095 info->host->host_no); 2096 2097 2098 request_sense: 2099 if (SCpnt->cmnd[0] == REQUEST_SENSE) 2100 goto done; 2101 2102 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0); 2103 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2104 "requesting sense"); 2105 init_SCp(SCpnt); 2106 SCpnt->SCp.Message = 0; 2107 SCpnt->SCp.Status = 0; 2108 SCpnt->host_scribble = (void *)fas216_rq_sns_done; 2109 2110 /* 2111 * Place this command into the high priority "request 2112 * sense" slot. This will be the very next command 2113 * executed, unless a target connects to us. 2114 */ 2115 if (info->reqSCpnt) 2116 printk(KERN_WARNING "scsi%d.%c: losing request command\n", 2117 info->host->host_no, '0' + SCpnt->device->id); 2118 info->reqSCpnt = SCpnt; 2119 } 2120 2121 /** 2122 * fas216_done - complete processing for current command 2123 * @info: interface that completed 2124 * @result: driver byte of result 2125 * 2126 * Complete processing for current command 2127 */ 2128 static void fas216_done(FAS216_Info *info, unsigned int result) 2129 { 2130 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int); 2131 struct scsi_cmnd *SCpnt; 2132 unsigned long flags; 2133 2134 fas216_checkmagic(info); 2135 2136 if (!info->SCpnt) 2137 goto no_command; 2138 2139 SCpnt = info->SCpnt; 2140 info->SCpnt = NULL; 2141 info->scsi.phase = PHASE_IDLE; 2142 2143 if (info->scsi.aborting) { 2144 fas216_log(info, 0, "uncaught abort - returning DID_ABORT"); 2145 result = DID_ABORT; 2146 info->scsi.aborting = 0; 2147 } 2148 2149 /* 2150 * Sanity check the completion - if we have zero bytes left 2151 * to transfer, we should not have a valid pointer. 2152 */ 2153 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) { 2154 scmd_printk(KERN_INFO, SCpnt, 2155 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n", 2156 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 2157 info->scsi.SCp.ptr = NULL; 2158 scsi_print_command(SCpnt); 2159 } 2160 2161 /* 2162 * Clear down this command as completed. If we need to request 2163 * the sense information, fas216_kick will re-assert the busy 2164 * status. 2165 */ 2166 info->device[SCpnt->device->id].parity_check = 0; 2167 clear_bit(SCpnt->device->id * 8 + 2168 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2169 2170 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble; 2171 fn(info, SCpnt, result); 2172 2173 if (info->scsi.irq) { 2174 spin_lock_irqsave(&info->host_lock, flags); 2175 if (info->scsi.phase == PHASE_IDLE) 2176 fas216_kick(info); 2177 spin_unlock_irqrestore(&info->host_lock, flags); 2178 } 2179 return; 2180 2181 no_command: 2182 panic("scsi%d.H: null command in fas216_done", 2183 info->host->host_no); 2184 } 2185 2186 /** 2187 * fas216_queue_command_internal - queue a command for the adapter to process 2188 * @SCpnt: Command to queue 2189 * @done: done function to call once command is complete 2190 * 2191 * Queue a command for adapter to process. 2192 * Returns: 0 on success, else error. 2193 * Notes: io_request_lock is held, interrupts are disabled. 2194 */ 2195 static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt, 2196 void (*done)(struct scsi_cmnd *)) 2197 { 2198 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2199 int result; 2200 2201 fas216_checkmagic(info); 2202 2203 fas216_log_command(info, LOG_CONNECT, SCpnt, 2204 "received command (%p)", SCpnt); 2205 2206 fas216_cmd_priv(SCpnt)->scsi_done = done; 2207 SCpnt->host_scribble = (void *)fas216_std_done; 2208 SCpnt->result = 0; 2209 2210 init_SCp(SCpnt); 2211 2212 info->stats.queues += 1; 2213 2214 spin_lock(&info->host_lock); 2215 2216 /* 2217 * Add command into execute queue and let it complete under 2218 * whatever scheme we're using. 2219 */ 2220 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt); 2221 2222 /* 2223 * If we successfully added the command, 2224 * kick the interface to get it moving. 2225 */ 2226 if (result == 0 && info->scsi.phase == PHASE_IDLE) 2227 fas216_kick(info); 2228 spin_unlock(&info->host_lock); 2229 2230 fas216_log_target(info, LOG_CONNECT, -1, "queue %s", 2231 result ? "failure" : "success"); 2232 2233 return result; 2234 } 2235 2236 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt) 2237 { 2238 return fas216_queue_command_internal(SCpnt, scsi_done); 2239 } 2240 2241 DEF_SCSI_QCMD(fas216_queue_command) 2242 2243 /** 2244 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command 2245 * @SCpnt: Command to wake 2246 * 2247 * Trigger restart of a waiting thread in fas216_command 2248 */ 2249 static void fas216_internal_done(struct scsi_cmnd *SCpnt) 2250 { 2251 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2252 2253 fas216_checkmagic(info); 2254 2255 info->internal_done = 1; 2256 } 2257 2258 /** 2259 * fas216_noqueue_command - process a command for the adapter. 2260 * @SCpnt: Command to queue 2261 * 2262 * Queue a command for adapter to process. 2263 * Returns: scsi result code. 2264 * Notes: io_request_lock is held, interrupts are disabled. 2265 */ 2266 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt) 2267 { 2268 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2269 2270 fas216_checkmagic(info); 2271 2272 /* 2273 * We should only be using this if we don't have an interrupt. 2274 * Provide some "incentive" to use the queueing code. 2275 */ 2276 BUG_ON(info->scsi.irq); 2277 2278 info->internal_done = 0; 2279 fas216_queue_command_internal(SCpnt, fas216_internal_done); 2280 2281 /* 2282 * This wastes time, since we can't return until the command is 2283 * complete. We can't sleep either since we may get re-entered! 2284 * However, we must re-enable interrupts, or else we'll be 2285 * waiting forever. 2286 */ 2287 spin_unlock_irq(info->host->host_lock); 2288 2289 while (!info->internal_done) { 2290 /* 2291 * If we don't have an IRQ, then we must poll the card for 2292 * it's interrupt, and use that to call this driver's 2293 * interrupt routine. That way, we keep the command 2294 * progressing. Maybe we can add some intelligence here 2295 * and go to sleep if we know that the device is going 2296 * to be some time (eg, disconnected). 2297 */ 2298 if (fas216_readb(info, REG_STAT) & STAT_INT) { 2299 spin_lock_irq(info->host->host_lock); 2300 fas216_intr(info); 2301 spin_unlock_irq(info->host->host_lock); 2302 } 2303 } 2304 2305 spin_lock_irq(info->host->host_lock); 2306 2307 scsi_done(SCpnt); 2308 2309 return 0; 2310 } 2311 2312 DEF_SCSI_QCMD(fas216_noqueue_command) 2313 2314 /* 2315 * Error handler timeout function. Indicate that we timed out, 2316 * and wake up any error handler process so it can continue. 2317 */ 2318 static void fas216_eh_timer(struct timer_list *t) 2319 { 2320 FAS216_Info *info = from_timer(info, t, eh_timer); 2321 2322 fas216_log(info, LOG_ERROR, "error handling timed out\n"); 2323 2324 del_timer(&info->eh_timer); 2325 2326 if (info->rst_bus_status == 0) 2327 info->rst_bus_status = -1; 2328 if (info->rst_dev_status == 0) 2329 info->rst_dev_status = -1; 2330 2331 wake_up(&info->eh_wait); 2332 } 2333 2334 enum res_find { 2335 res_failed, /* not found */ 2336 res_success, /* command on issue queue */ 2337 res_hw_abort /* command on disconnected dev */ 2338 }; 2339 2340 /** 2341 * fas216_do_abort - decide how to abort a command 2342 * @SCpnt: command to abort 2343 * 2344 * Decide how to abort a command. 2345 * Returns: abort status 2346 */ 2347 static enum res_find fas216_find_command(FAS216_Info *info, 2348 struct scsi_cmnd *SCpnt) 2349 { 2350 enum res_find res = res_failed; 2351 2352 if (queue_remove_cmd(&info->queues.issue, SCpnt)) { 2353 /* 2354 * The command was on the issue queue, and has not been 2355 * issued yet. We can remove the command from the queue, 2356 * and acknowledge the abort. Neither the device nor the 2357 * interface know about the command. 2358 */ 2359 printk("on issue queue "); 2360 2361 res = res_success; 2362 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) { 2363 /* 2364 * The command was on the disconnected queue. We must 2365 * reconnect with the device if possible, and send it 2366 * an abort message. 2367 */ 2368 printk("on disconnected queue "); 2369 2370 res = res_hw_abort; 2371 } else if (info->SCpnt == SCpnt) { 2372 printk("executing "); 2373 2374 switch (info->scsi.phase) { 2375 /* 2376 * If the interface is idle, and the command is 'disconnectable', 2377 * then it is the same as on the disconnected queue. 2378 */ 2379 case PHASE_IDLE: 2380 if (info->scsi.disconnectable) { 2381 info->scsi.disconnectable = 0; 2382 info->SCpnt = NULL; 2383 res = res_hw_abort; 2384 } 2385 break; 2386 2387 default: 2388 break; 2389 } 2390 } else if (info->origSCpnt == SCpnt) { 2391 /* 2392 * The command will be executed next, but a command 2393 * is currently using the interface. This is similar to 2394 * being on the issue queue, except the busylun bit has 2395 * been set. 2396 */ 2397 info->origSCpnt = NULL; 2398 clear_bit(SCpnt->device->id * 8 + 2399 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2400 printk("waiting for execution "); 2401 res = res_success; 2402 } else 2403 printk("unknown "); 2404 2405 return res; 2406 } 2407 2408 /** 2409 * fas216_eh_abort - abort this command 2410 * @SCpnt: command to abort 2411 * 2412 * Abort this command. 2413 * Returns: FAILED if unable to abort 2414 * Notes: io_request_lock is taken, and irqs are disabled 2415 */ 2416 int fas216_eh_abort(struct scsi_cmnd *SCpnt) 2417 { 2418 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2419 int result = FAILED; 2420 2421 fas216_checkmagic(info); 2422 2423 info->stats.aborts += 1; 2424 2425 scmd_printk(KERN_WARNING, SCpnt, "abort command\n"); 2426 2427 print_debug_list(); 2428 fas216_dumpstate(info); 2429 2430 switch (fas216_find_command(info, SCpnt)) { 2431 /* 2432 * We found the command, and cleared it out. Either 2433 * the command is still known to be executing on the 2434 * target, or the busylun bit is not set. 2435 */ 2436 case res_success: 2437 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt); 2438 result = SUCCESS; 2439 break; 2440 2441 /* 2442 * We need to reconnect to the target and send it an 2443 * ABORT or ABORT_TAG message. We can only do this 2444 * if the bus is free. 2445 */ 2446 case res_hw_abort: 2447 2448 /* 2449 * We are unable to abort the command for some reason. 2450 */ 2451 default: 2452 case res_failed: 2453 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt); 2454 break; 2455 } 2456 2457 return result; 2458 } 2459 2460 /** 2461 * fas216_eh_device_reset - Reset the device associated with this command 2462 * @SCpnt: command specifing device to reset 2463 * 2464 * Reset the device associated with this command. 2465 * Returns: FAILED if unable to reset. 2466 * Notes: We won't be re-entered, so we'll only have one device 2467 * reset on the go at one time. 2468 */ 2469 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt) 2470 { 2471 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2472 unsigned long flags; 2473 int i, res = FAILED, target = SCpnt->device->id; 2474 2475 fas216_log(info, LOG_ERROR, "device reset for target %d", target); 2476 2477 spin_lock_irqsave(&info->host_lock, flags); 2478 2479 do { 2480 /* 2481 * If we are currently connected to a device, and 2482 * it is the device we want to reset, there is 2483 * nothing we can do here. Chances are it is stuck, 2484 * and we need a bus reset. 2485 */ 2486 if (info->SCpnt && !info->scsi.disconnectable && 2487 info->SCpnt->device->id == SCpnt->device->id) 2488 break; 2489 2490 /* 2491 * We're going to be resetting this device. Remove 2492 * all pending commands from the driver. By doing 2493 * so, we guarantee that we won't touch the command 2494 * structures except to process the reset request. 2495 */ 2496 queue_remove_all_target(&info->queues.issue, target); 2497 queue_remove_all_target(&info->queues.disconnected, target); 2498 if (info->origSCpnt && info->origSCpnt->device->id == target) 2499 info->origSCpnt = NULL; 2500 if (info->reqSCpnt && info->reqSCpnt->device->id == target) 2501 info->reqSCpnt = NULL; 2502 for (i = 0; i < 8; i++) 2503 clear_bit(target * 8 + i, info->busyluns); 2504 2505 /* 2506 * Hijack this SCSI command structure to send 2507 * a bus device reset message to this device. 2508 */ 2509 SCpnt->host_scribble = (void *)fas216_devicereset_done; 2510 2511 info->rst_dev_status = 0; 2512 info->rstSCpnt = SCpnt; 2513 2514 if (info->scsi.phase == PHASE_IDLE) 2515 fas216_kick(info); 2516 2517 mod_timer(&info->eh_timer, jiffies + 30 * HZ); 2518 spin_unlock_irqrestore(&info->host_lock, flags); 2519 2520 /* 2521 * Wait up to 30 seconds for the reset to complete. 2522 */ 2523 wait_event(info->eh_wait, info->rst_dev_status); 2524 2525 del_timer_sync(&info->eh_timer); 2526 spin_lock_irqsave(&info->host_lock, flags); 2527 info->rstSCpnt = NULL; 2528 2529 if (info->rst_dev_status == 1) 2530 res = SUCCESS; 2531 } while (0); 2532 2533 SCpnt->host_scribble = NULL; 2534 spin_unlock_irqrestore(&info->host_lock, flags); 2535 2536 fas216_log(info, LOG_ERROR, "device reset complete: %s\n", 2537 res == SUCCESS ? "success" : "failed"); 2538 2539 return res; 2540 } 2541 2542 /** 2543 * fas216_eh_bus_reset - Reset the bus associated with the command 2544 * @SCpnt: command specifing bus to reset 2545 * 2546 * Reset the bus associated with the command. 2547 * Returns: FAILED if unable to reset. 2548 * Notes: Further commands are blocked. 2549 */ 2550 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt) 2551 { 2552 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2553 unsigned long flags; 2554 struct scsi_device *SDpnt; 2555 2556 fas216_checkmagic(info); 2557 fas216_log(info, LOG_ERROR, "resetting bus"); 2558 2559 info->stats.bus_resets += 1; 2560 2561 spin_lock_irqsave(&info->host_lock, flags); 2562 2563 /* 2564 * Stop all activity on this interface. 2565 */ 2566 fas216_aborttransfer(info); 2567 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2568 2569 /* 2570 * Clear any pending interrupts. 2571 */ 2572 while (fas216_readb(info, REG_STAT) & STAT_INT) 2573 fas216_readb(info, REG_INST); 2574 2575 info->rst_bus_status = 0; 2576 2577 /* 2578 * For each attached hard-reset device, clear out 2579 * all command structures. Leave the running 2580 * command in place. 2581 */ 2582 shost_for_each_device(SDpnt, info->host) { 2583 int i; 2584 2585 if (SDpnt->soft_reset) 2586 continue; 2587 2588 queue_remove_all_target(&info->queues.issue, SDpnt->id); 2589 queue_remove_all_target(&info->queues.disconnected, SDpnt->id); 2590 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id) 2591 info->origSCpnt = NULL; 2592 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id) 2593 info->reqSCpnt = NULL; 2594 info->SCpnt = NULL; 2595 2596 for (i = 0; i < 8; i++) 2597 clear_bit(SDpnt->id * 8 + i, info->busyluns); 2598 } 2599 2600 info->scsi.phase = PHASE_IDLE; 2601 2602 /* 2603 * Reset the SCSI bus. Device cleanup happens in 2604 * the interrupt handler. 2605 */ 2606 fas216_cmd(info, CMD_RESETSCSI); 2607 2608 mod_timer(&info->eh_timer, jiffies + HZ); 2609 spin_unlock_irqrestore(&info->host_lock, flags); 2610 2611 /* 2612 * Wait one second for the interrupt. 2613 */ 2614 wait_event(info->eh_wait, info->rst_bus_status); 2615 del_timer_sync(&info->eh_timer); 2616 2617 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n", 2618 info->rst_bus_status == 1 ? "success" : "failed"); 2619 2620 return info->rst_bus_status == 1 ? SUCCESS : FAILED; 2621 } 2622 2623 /** 2624 * fas216_init_chip - Initialise FAS216 state after reset 2625 * @info: state structure for interface 2626 * 2627 * Initialise FAS216 state after reset 2628 */ 2629 static void fas216_init_chip(FAS216_Info *info) 2630 { 2631 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7; 2632 fas216_writeb(info, REG_CLKF, clock); 2633 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2634 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]); 2635 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2636 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 2637 fas216_writeb(info, REG_SOF, 0); 2638 fas216_writeb(info, REG_STP, info->scsi.async_stp); 2639 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2640 } 2641 2642 /** 2643 * fas216_eh_host_reset - Reset the host associated with this command 2644 * @SCpnt: command specifing host to reset 2645 * 2646 * Reset the host associated with this command. 2647 * Returns: FAILED if unable to reset. 2648 * Notes: io_request_lock is taken, and irqs are disabled 2649 */ 2650 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt) 2651 { 2652 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2653 2654 spin_lock_irq(info->host->host_lock); 2655 2656 fas216_checkmagic(info); 2657 2658 fas216_log(info, LOG_ERROR, "resetting host"); 2659 2660 /* 2661 * Reset the SCSI chip. 2662 */ 2663 fas216_cmd(info, CMD_RESETCHIP); 2664 2665 /* 2666 * Ugly ugly ugly! 2667 * We need to release the host_lock and enable 2668 * IRQs if we sleep, but we must relock and disable 2669 * IRQs after the sleep. 2670 */ 2671 spin_unlock_irq(info->host->host_lock); 2672 msleep(50 * 1000/100); 2673 spin_lock_irq(info->host->host_lock); 2674 2675 /* 2676 * Release the SCSI reset. 2677 */ 2678 fas216_cmd(info, CMD_NOP); 2679 2680 fas216_init_chip(info); 2681 2682 spin_unlock_irq(info->host->host_lock); 2683 return SUCCESS; 2684 } 2685 2686 #define TYPE_UNKNOWN 0 2687 #define TYPE_NCR53C90 1 2688 #define TYPE_NCR53C90A 2 2689 #define TYPE_NCR53C9x 3 2690 #define TYPE_Am53CF94 4 2691 #define TYPE_EmFAS216 5 2692 #define TYPE_QLFAS216 6 2693 2694 static char *chip_types[] = { 2695 "unknown", 2696 "NS NCR53C90", 2697 "NS NCR53C90A", 2698 "NS NCR53C9x", 2699 "AMD Am53CF94", 2700 "Emulex FAS216", 2701 "QLogic FAS216" 2702 }; 2703 2704 static int fas216_detect_type(FAS216_Info *info) 2705 { 2706 int family, rev; 2707 2708 /* 2709 * Reset the chip. 2710 */ 2711 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2712 udelay(50); 2713 fas216_writeb(info, REG_CMD, CMD_NOP); 2714 2715 /* 2716 * Check to see if control reg 2 is present. 2717 */ 2718 fas216_writeb(info, REG_CNTL3, 0); 2719 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE); 2720 2721 /* 2722 * If we are unable to read back control reg 2 2723 * correctly, it is not present, and we have a 2724 * NCR53C90. 2725 */ 2726 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE) 2727 return TYPE_NCR53C90; 2728 2729 /* 2730 * Now, check control register 3 2731 */ 2732 fas216_writeb(info, REG_CNTL2, 0); 2733 fas216_writeb(info, REG_CNTL3, 0); 2734 fas216_writeb(info, REG_CNTL3, 5); 2735 2736 /* 2737 * If we are unable to read the register back 2738 * correctly, we have a NCR53C90A 2739 */ 2740 if (fas216_readb(info, REG_CNTL3) != 5) 2741 return TYPE_NCR53C90A; 2742 2743 /* 2744 * Now read the ID from the chip. 2745 */ 2746 fas216_writeb(info, REG_CNTL3, 0); 2747 2748 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK); 2749 fas216_writeb(info, REG_CNTL3, 0); 2750 2751 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2752 udelay(50); 2753 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP); 2754 2755 fas216_writeb(info, REG_CNTL2, CNTL2_ENF); 2756 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2757 udelay(50); 2758 fas216_writeb(info, REG_CMD, CMD_NOP); 2759 2760 rev = fas216_readb(info, REG_ID); 2761 family = rev >> 3; 2762 rev &= 7; 2763 2764 switch (family) { 2765 case 0x01: 2766 if (rev == 4) 2767 return TYPE_Am53CF94; 2768 break; 2769 2770 case 0x02: 2771 switch (rev) { 2772 case 2: 2773 return TYPE_EmFAS216; 2774 case 3: 2775 return TYPE_QLFAS216; 2776 } 2777 break; 2778 2779 default: 2780 break; 2781 } 2782 printk("family %x rev %x\n", family, rev); 2783 return TYPE_NCR53C9x; 2784 } 2785 2786 /** 2787 * fas216_reset_state - Initialise driver internal state 2788 * @info: state to initialise 2789 * 2790 * Initialise driver internal state 2791 */ 2792 static void fas216_reset_state(FAS216_Info *info) 2793 { 2794 int i; 2795 2796 fas216_checkmagic(info); 2797 2798 fas216_bus_reset(info); 2799 2800 /* 2801 * Clear out all stale info in our state structure 2802 */ 2803 memset(info->busyluns, 0, sizeof(info->busyluns)); 2804 info->scsi.disconnectable = 0; 2805 info->scsi.aborting = 0; 2806 2807 for (i = 0; i < 8; i++) { 2808 info->device[i].parity_enabled = 0; 2809 info->device[i].parity_check = 1; 2810 } 2811 2812 /* 2813 * Drain all commands on disconnected queue 2814 */ 2815 while (queue_remove(&info->queues.disconnected) != NULL); 2816 2817 /* 2818 * Remove executing commands. 2819 */ 2820 info->SCpnt = NULL; 2821 info->reqSCpnt = NULL; 2822 info->rstSCpnt = NULL; 2823 info->origSCpnt = NULL; 2824 } 2825 2826 /** 2827 * fas216_init - initialise FAS/NCR/AMD SCSI structures. 2828 * @host: a driver-specific filled-out structure 2829 * 2830 * Initialise FAS/NCR/AMD SCSI structures. 2831 * Returns: 0 on success 2832 */ 2833 int fas216_init(struct Scsi_Host *host) 2834 { 2835 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2836 2837 info->magic_start = MAGIC; 2838 info->magic_end = MAGIC; 2839 info->host = host; 2840 info->scsi.cfg[0] = host->this_id | CNTL1_PERE; 2841 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE; 2842 info->scsi.cfg[2] = info->ifcfg.cntl3 | 2843 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM; 2844 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod); 2845 2846 info->rst_dev_status = -1; 2847 info->rst_bus_status = -1; 2848 init_waitqueue_head(&info->eh_wait); 2849 timer_setup(&info->eh_timer, fas216_eh_timer, 0); 2850 2851 spin_lock_init(&info->host_lock); 2852 2853 memset(&info->stats, 0, sizeof(info->stats)); 2854 2855 msgqueue_initialise(&info->scsi.msgs); 2856 2857 if (!queue_initialise(&info->queues.issue)) 2858 return -ENOMEM; 2859 2860 if (!queue_initialise(&info->queues.disconnected)) { 2861 queue_free(&info->queues.issue); 2862 return -ENOMEM; 2863 } 2864 2865 return 0; 2866 } 2867 2868 /** 2869 * fas216_add - initialise FAS/NCR/AMD SCSI ic. 2870 * @host: a driver-specific filled-out structure 2871 * @dev: parent device 2872 * 2873 * Initialise FAS/NCR/AMD SCSI ic. 2874 * Returns: 0 on success 2875 */ 2876 int fas216_add(struct Scsi_Host *host, struct device *dev) 2877 { 2878 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2879 int type, ret; 2880 2881 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) { 2882 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n", 2883 info->ifcfg.clockrate); 2884 return -EINVAL; 2885 } 2886 2887 fas216_reset_state(info); 2888 type = fas216_detect_type(info); 2889 info->scsi.type = chip_types[type]; 2890 2891 udelay(300); 2892 2893 /* 2894 * Initialise the chip correctly. 2895 */ 2896 fas216_init_chip(info); 2897 2898 /* 2899 * Reset the SCSI bus. We don't want to see 2900 * the resulting reset interrupt, so mask it 2901 * out. 2902 */ 2903 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR); 2904 fas216_writeb(info, REG_CMD, CMD_RESETSCSI); 2905 2906 /* 2907 * scsi standard says wait 250ms 2908 */ 2909 spin_unlock_irq(info->host->host_lock); 2910 msleep(100*1000/100); 2911 spin_lock_irq(info->host->host_lock); 2912 2913 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2914 fas216_readb(info, REG_INST); 2915 2916 fas216_checkmagic(info); 2917 2918 ret = scsi_add_host(host, dev); 2919 if (ret) 2920 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2921 else 2922 scsi_scan_host(host); 2923 2924 return ret; 2925 } 2926 2927 void fas216_remove(struct Scsi_Host *host) 2928 { 2929 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2930 2931 fas216_checkmagic(info); 2932 scsi_remove_host(host); 2933 2934 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2935 scsi_host_put(host); 2936 } 2937 2938 /** 2939 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic. 2940 * @host: a driver-specific filled-out structure 2941 * 2942 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic. 2943 */ 2944 void fas216_release(struct Scsi_Host *host) 2945 { 2946 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2947 2948 queue_free(&info->queues.disconnected); 2949 queue_free(&info->queues.issue); 2950 } 2951 2952 void fas216_print_host(FAS216_Info *info, struct seq_file *m) 2953 { 2954 seq_printf(m, 2955 "\n" 2956 "Chip : %s\n" 2957 " Address: 0x%p\n" 2958 " IRQ : %d\n" 2959 " DMA : %d\n", 2960 info->scsi.type, info->scsi.io_base, 2961 info->scsi.irq, info->scsi.dma); 2962 } 2963 2964 void fas216_print_stats(FAS216_Info *info, struct seq_file *m) 2965 { 2966 seq_printf(m, "\n" 2967 "Command Statistics:\n" 2968 " Queued : %u\n" 2969 " Issued : %u\n" 2970 " Completed : %u\n" 2971 " Reads : %u\n" 2972 " Writes : %u\n" 2973 " Others : %u\n" 2974 " Disconnects: %u\n" 2975 " Aborts : %u\n" 2976 " Bus resets : %u\n" 2977 " Host resets: %u\n", 2978 info->stats.queues, info->stats.removes, 2979 info->stats.fins, info->stats.reads, 2980 info->stats.writes, info->stats.miscs, 2981 info->stats.disconnects, info->stats.aborts, 2982 info->stats.bus_resets, info->stats.host_resets); 2983 } 2984 2985 void fas216_print_devices(FAS216_Info *info, struct seq_file *m) 2986 { 2987 struct fas216_device *dev; 2988 struct scsi_device *scd; 2989 2990 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n"); 2991 2992 shost_for_each_device(scd, info->host) { 2993 dev = &info->device[scd->id]; 2994 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 2995 if (scd->tagged_supported) 2996 seq_printf(m, "%3sabled ", 2997 scd->simple_tags ? "en" : "dis"); 2998 else 2999 seq_puts(m, "unsupported "); 3000 3001 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis"); 3002 3003 if (dev->sof) 3004 seq_printf(m, "offset %d, %d ns\n", 3005 dev->sof, dev->period * 4); 3006 else 3007 seq_puts(m, "async\n"); 3008 } 3009 } 3010 3011 EXPORT_SYMBOL(fas216_init); 3012 EXPORT_SYMBOL(fas216_add); 3013 EXPORT_SYMBOL(fas216_queue_command); 3014 EXPORT_SYMBOL(fas216_noqueue_command); 3015 EXPORT_SYMBOL(fas216_intr); 3016 EXPORT_SYMBOL(fas216_remove); 3017 EXPORT_SYMBOL(fas216_release); 3018 EXPORT_SYMBOL(fas216_eh_abort); 3019 EXPORT_SYMBOL(fas216_eh_device_reset); 3020 EXPORT_SYMBOL(fas216_eh_bus_reset); 3021 EXPORT_SYMBOL(fas216_eh_host_reset); 3022 EXPORT_SYMBOL(fas216_print_host); 3023 EXPORT_SYMBOL(fas216_print_stats); 3024 EXPORT_SYMBOL(fas216_print_devices); 3025 3026 MODULE_AUTHOR("Russell King"); 3027 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core"); 3028 MODULE_LICENSE("GPL"); 3029