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