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