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 97static int level_mask = LOG_ERROR; 98 99module_param(level_mask, int, 0644); 100 101static 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 142static 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 148static 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 154static 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 175static 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 182static void fas216_dumpinfo(FAS216_Info *info) 183{ 184 static int used = 0; 185 int i; 186 187 if (used++) 188 return; 189 190 printk("FAS216_Info=\n"); 191 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n", 192 info->magic_start, info->host, info->SCpnt, 193 info->origSCpnt); 194 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n", 195 info->scsi.io_shift, info->scsi.irq, 196 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2], 197 info->scsi.cfg[3]); 198 printk(" type=%p phase=%X\n", 199 info->scsi.type, info->scsi.phase); 200 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n"); 201 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n", 202 info->scsi.async_stp, 203 info->scsi.disconnectable, info->scsi.aborting); 204 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n" 205 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n", 206 info->stats.queues, info->stats.removes, info->stats.fins, 207 info->stats.reads, info->stats.writes, info->stats.miscs, 208 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets, 209 info->stats.host_resets); 210 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n", 211 info->ifcfg.clockrate, info->ifcfg.select_timeout, 212 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth); 213 for (i = 0; i < 8; i++) { 214 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n", 215 i, info->busyluns[i], i, 216 info->device[i].disconnect_ok, info->device[i].stp, 217 info->device[i].sof, info->device[i].sync_state); 218 } 219 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n", 220 info->dma.transfer_type, info->dma.setup, 221 info->dma.pseudo, info->dma.stop); 222 printk(" internal_done=%X magic_end=%lX }\n", 223 info->internal_done, info->magic_end); 224} 225 226#ifdef CHECK_STRUCTURE 227static 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), __FUNCTION__) 244#else 245#define fas216_checkmagic(info) 246#endif 247 248static 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 260static 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 282static 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 290static void 291fas216_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 299static 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 315static void 316fas216_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 335static 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 351static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE]; 352static int ph_ptr; 353 354static 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 364static struct { int command; void *from; } cmd_list[8]; 365static int cmd_ptr; 366 367static 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 377static 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 404static 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 */ 413static inline unsigned short 414fas216_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 */ 446static 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 */ 470static 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 */ 515static 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 */ 628static 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 */ 668static 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 683static 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 690static 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 */ 704static 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 */ 748static 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 */ 830static 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 863static 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 875static 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 */ 883static 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 */ 937static void 938fas216_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 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT); 1026 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1027 info->scsi.aborting = 1; 1028 } 1029 1030 fas216_cmd(info, CMD_MSGACCEPTED); 1031 return; 1032 1033 initiator_error: 1034 printk(KERN_ERR "scsi%d.H: error during reselection: bytes", 1035 info->host->host_no); 1036 for (i = 0; i < cfis; i++) 1037 printk(" %02x", msg[i]); 1038 printk("\n"); 1039 bad_message: 1040 fas216_cmd(info, CMD_SETATN); 1041 msgqueue_flush(&info->scsi.msgs); 1042 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1043 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1044 fas216_cmd(info, CMD_MSGACCEPTED); 1045} 1046 1047static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen) 1048{ 1049 int i; 1050 1051 switch (message[0]) { 1052 case COMMAND_COMPLETE: 1053 if (msglen != 1) 1054 goto unrecognised; 1055 1056 printk(KERN_ERR "scsi%d.%c: command complete with no " 1057 "status in MESSAGE_IN?\n", 1058 info->host->host_no, fas216_target(info)); 1059 break; 1060 1061 case SAVE_POINTERS: 1062 if (msglen != 1) 1063 goto unrecognised; 1064 1065 /* 1066 * Save current data pointer to SAVED data pointer 1067 * SCSI II standard says that we must not acknowledge 1068 * this until we have really saved pointers. 1069 * NOTE: we DO NOT save the command nor status pointers 1070 * as required by the SCSI II standard. These always 1071 * point to the start of their respective areas. 1072 */ 1073 info->SCpnt->SCp = info->scsi.SCp; 1074 info->SCpnt->SCp.sent_command = 0; 1075 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1076 "save data pointers: [%p, %X]", 1077 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1078 break; 1079 1080 case RESTORE_POINTERS: 1081 if (msglen != 1) 1082 goto unrecognised; 1083 1084 /* 1085 * Restore current data pointer from SAVED data pointer 1086 */ 1087 info->scsi.SCp = info->SCpnt->SCp; 1088 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1089 "restore data pointers: [%p, 0x%x]", 1090 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1091 break; 1092 1093 case DISCONNECT: 1094 if (msglen != 1) 1095 goto unrecognised; 1096 1097 info->scsi.phase = PHASE_MSGIN_DISCONNECT; 1098 break; 1099 1100 case MESSAGE_REJECT: 1101 if (msglen != 1) 1102 goto unrecognised; 1103 1104 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) { 1105 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8: 1106 fas216_handlesync(info, message); 1107 break; 1108 1109 default: 1110 fas216_log(info, 0, "reject, last message 0x%04x", 1111 fas216_get_last_msg(info, info->scsi.msgin_fifo)); 1112 } 1113 break; 1114 1115 case NOP: 1116 break; 1117 1118 case EXTENDED_MESSAGE: 1119 if (msglen < 3) 1120 goto unrecognised; 1121 1122 switch (message[2]) { 1123 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */ 1124 fas216_handlesync(info, message); 1125 break; 1126 1127 default: 1128 goto unrecognised; 1129 } 1130 break; 1131 1132 default: 1133 goto unrecognised; 1134 } 1135 return; 1136 1137unrecognised: 1138 fas216_log(info, 0, "unrecognised message, rejecting"); 1139 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info)); 1140 for (i = 0; i < msglen; i++) 1141 printk("%s%02X", i & 31 ? " " : "\n ", message[i]); 1142 printk("\n"); 1143 1144 /* 1145 * Something strange seems to be happening here - 1146 * I can't use SETATN since the chip gives me an 1147 * invalid command interrupt when I do. Weird. 1148 */ 1149fas216_cmd(info, CMD_NOP); 1150fas216_dumpstate(info); 1151 fas216_cmd(info, CMD_SETATN); 1152 msgqueue_flush(&info->scsi.msgs); 1153 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 1154 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1155fas216_dumpstate(info); 1156} 1157 1158static int fas216_wait_cmd(FAS216_Info *info, int cmd) 1159{ 1160 int tout; 1161 int stat; 1162 1163 fas216_cmd(info, cmd); 1164 1165 for (tout = 1000; tout; tout -= 1) { 1166 stat = fas216_readb(info, REG_STAT); 1167 if (stat & (STAT_INT|STAT_PARITYERROR)) 1168 break; 1169 udelay(1); 1170 } 1171 1172 return stat; 1173} 1174 1175static int fas216_get_msg_byte(FAS216_Info *info) 1176{ 1177 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED); 1178 1179 if ((stat & STAT_INT) == 0) 1180 goto timedout; 1181 1182 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1183 goto unexpected_phase_change; 1184 1185 fas216_readb(info, REG_INST); 1186 1187 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO); 1188 1189 if ((stat & STAT_INT) == 0) 1190 goto timedout; 1191 1192 if (stat & STAT_PARITYERROR) 1193 goto parity_error; 1194 1195 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1196 goto unexpected_phase_change; 1197 1198 fas216_readb(info, REG_INST); 1199 1200 return fas216_readb(info, REG_FF); 1201 1202timedout: 1203 fas216_log(info, LOG_ERROR, "timed out waiting for message byte"); 1204 return -1; 1205 1206unexpected_phase_change: 1207 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat); 1208 return -2; 1209 1210parity_error: 1211 fas216_log(info, LOG_ERROR, "parity error during message in phase"); 1212 return -3; 1213} 1214 1215/** 1216 * fas216_message - handle a function done interrupt from FAS216 chip 1217 * @info: interface which caused function done interrupt 1218 * 1219 * Handle a function done interrupt from FAS216 chip 1220 */ 1221static void fas216_message(FAS216_Info *info) 1222{ 1223 unsigned char *message = info->scsi.message; 1224 unsigned int msglen = 1; 1225 int msgbyte = 0; 1226 1227 fas216_checkmagic(info); 1228 1229 message[0] = fas216_readb(info, REG_FF); 1230 1231 if (message[0] == EXTENDED_MESSAGE) { 1232 msgbyte = fas216_get_msg_byte(info); 1233 1234 if (msgbyte >= 0) { 1235 message[1] = msgbyte; 1236 1237 for (msglen = 2; msglen < message[1] + 2; msglen++) { 1238 msgbyte = fas216_get_msg_byte(info); 1239 1240 if (msgbyte >= 0) 1241 message[msglen] = msgbyte; 1242 else 1243 break; 1244 } 1245 } 1246 } 1247 1248 if (msgbyte == -3) 1249 goto parity_error; 1250 1251#ifdef DEBUG_MESSAGES 1252 { 1253 int i; 1254 1255 printk("scsi%d.%c: message in: ", 1256 info->host->host_no, fas216_target(info)); 1257 for (i = 0; i < msglen; i++) 1258 printk("%02X ", message[i]); 1259 printk("\n"); 1260 } 1261#endif 1262 1263 fas216_parse_message(info, message, msglen); 1264 fas216_cmd(info, CMD_MSGACCEPTED); 1265 return; 1266 1267parity_error: 1268 fas216_cmd(info, CMD_SETATN); 1269 msgqueue_flush(&info->scsi.msgs); 1270 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR); 1271 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1272 fas216_cmd(info, CMD_MSGACCEPTED); 1273 return; 1274} 1275 1276/** 1277 * fas216_send_command - send command after all message bytes have been sent 1278 * @info: interface which caused bus service 1279 * 1280 * Send a command to a target after all message bytes have been sent 1281 */ 1282static void fas216_send_command(FAS216_Info *info) 1283{ 1284 int i; 1285 1286 fas216_checkmagic(info); 1287 1288 fas216_cmd(info, CMD_NOP|CMD_WITHDMA); 1289 fas216_cmd(info, CMD_FLUSHFIFO); 1290 1291 /* load command */ 1292 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++) 1293 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]); 1294 1295 fas216_cmd(info, CMD_TRANSFERINFO); 1296 1297 info->scsi.phase = PHASE_COMMAND; 1298} 1299 1300/** 1301 * fas216_send_messageout - handle bus service to send a message 1302 * @info: interface which caused bus service 1303 * 1304 * Handle bus service to send a message. 1305 * Note: We do not allow the device to change the data direction! 1306 */ 1307static void fas216_send_messageout(FAS216_Info *info, int start) 1308{ 1309 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1310 1311 fas216_checkmagic(info); 1312 1313 fas216_cmd(info, CMD_FLUSHFIFO); 1314 1315 if (tot_msglen) { 1316 struct message *msg; 1317 int msgnr = 0; 1318 1319 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1320 int i; 1321 1322 for (i = start; i < msg->length; i++) 1323 fas216_writeb(info, REG_FF, msg->msg[i]); 1324 1325 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1326 start = 0; 1327 } 1328 } else 1329 fas216_writeb(info, REG_FF, NOP); 1330 1331 fas216_cmd(info, CMD_TRANSFERINFO); 1332 1333 info->scsi.phase = PHASE_MSGOUT; 1334} 1335 1336/** 1337 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip 1338 * @info: interface which caused bus service interrupt 1339 * @stat: Status register contents 1340 * @is: SCSI Status register contents 1341 * 1342 * Handle a bus service interrupt from FAS216 chip 1343 */ 1344static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1345{ 1346 fas216_checkmagic(info); 1347 1348 fas216_log(info, LOG_BUSSERVICE, 1349 "bus service: stat=%02x is=%02x phase=%02x", 1350 stat, is, info->scsi.phase); 1351 1352 switch (info->scsi.phase) { 1353 case PHASE_SELECTION: 1354 if ((is & IS_BITS) != IS_MSGBYTESENT) 1355 goto bad_is; 1356 break; 1357 1358 case PHASE_SELSTEPS: 1359 switch (is & IS_BITS) { 1360 case IS_SELARB: 1361 case IS_MSGBYTESENT: 1362 goto bad_is; 1363 1364 case IS_NOTCOMMAND: 1365 case IS_EARLYPHASE: 1366 if ((stat & STAT_BUSMASK) == STAT_MESGIN) 1367 break; 1368 goto bad_is; 1369 1370 case IS_COMPLETE: 1371 break; 1372 } 1373 1374 default: 1375 break; 1376 } 1377 1378 fas216_cmd(info, CMD_NOP); 1379 1380#define STATE(st,ph) ((ph) << 3 | (st)) 1381 /* This table describes the legal SCSI state transitions, 1382 * as described by the SCSI II spec. 1383 */ 1384 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) { 1385 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */ 1386 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */ 1387 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */ 1388 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */ 1389 info->scsi.phase = PHASE_DATAIN; 1390 fas216_transfer(info); 1391 return; 1392 1393 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */ 1394 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */ 1395 fas216_cleanuptransfer(info); 1396 fas216_transfer(info); 1397 return; 1398 1399 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */ 1400 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */ 1401 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */ 1402 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */ 1403 fas216_cmd(info, CMD_FLUSHFIFO); 1404 info->scsi.phase = PHASE_DATAOUT; 1405 fas216_transfer(info); 1406 return; 1407 1408 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */ 1409 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */ 1410 fas216_stoptransfer(info); 1411 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */ 1412 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */ 1413 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */ 1414 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */ 1415 fas216_cmd(info, CMD_INITCMDCOMPLETE); 1416 info->scsi.phase = PHASE_STATUS; 1417 return; 1418 1419 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */ 1420 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */ 1421 fas216_stoptransfer(info); 1422 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */ 1423 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */ 1424 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */ 1425 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1426 fas216_cmd(info, CMD_FLUSHFIFO); 1427 fas216_cmd(info, CMD_TRANSFERINFO); 1428 info->scsi.phase = PHASE_MSGIN; 1429 return; 1430 1431 case STATE(STAT_MESGIN, PHASE_MSGIN): 1432 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1433 fas216_cmd(info, CMD_TRANSFERINFO); 1434 return; 1435 1436 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */ 1437 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */ 1438 fas216_send_command(info); 1439 info->scsi.phase = PHASE_COMMAND; 1440 return; 1441 1442 1443 /* 1444 * Selection -> Message Out 1445 */ 1446 case STATE(STAT_MESGOUT, PHASE_SELECTION): 1447 fas216_send_messageout(info, 1); 1448 return; 1449 1450 /* 1451 * Message Out -> Message Out 1452 */ 1453 case STATE(STAT_MESGOUT, PHASE_SELSTEPS): 1454 case STATE(STAT_MESGOUT, PHASE_MSGOUT): 1455 /* 1456 * If we get another message out phase, this usually 1457 * means some parity error occurred. Resend complete 1458 * set of messages. If we have more than one byte to 1459 * send, we need to assert ATN again. 1460 */ 1461 if (info->device[info->SCpnt->device->id].parity_check) { 1462 /* 1463 * We were testing... good, the device 1464 * supports parity checking. 1465 */ 1466 info->device[info->SCpnt->device->id].parity_check = 0; 1467 info->device[info->SCpnt->device->id].parity_enabled = 1; 1468 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1469 } 1470 1471 if (msgqueue_msglength(&info->scsi.msgs) > 1) 1472 fas216_cmd(info, CMD_SETATN); 1473 /*FALLTHROUGH*/ 1474 1475 /* 1476 * Any -> Message Out 1477 */ 1478 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT): 1479 fas216_send_messageout(info, 0); 1480 return; 1481 1482 /* Error recovery rules. 1483 * These either attempt to abort or retry the operation. 1484 * TODO: we need more of these 1485 */ 1486 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */ 1487 /* error - we've sent out all the command bytes 1488 * we have. 1489 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS 1490 * to include the command bytes sent for this to work 1491 * correctly. 1492 */ 1493 printk(KERN_ERR "scsi%d.%c: " 1494 "target trying to receive more command bytes\n", 1495 info->host->host_no, fas216_target(info)); 1496 fas216_cmd(info, CMD_SETATN); 1497 fas216_set_stc(info, 15); 1498 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA); 1499 msgqueue_flush(&info->scsi.msgs); 1500 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1501 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1502 return; 1503 } 1504 1505 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) { 1506 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n", 1507 info->host->host_no, fas216_target(info), 1508 fas216_bus_phase(stat)); 1509 msgqueue_flush(&info->scsi.msgs); 1510 fas216_cmd(info, CMD_SETATN); 1511 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1512 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1513 info->scsi.aborting = 1; 1514 fas216_cmd(info, CMD_TRANSFERINFO); 1515 return; 1516 } 1517 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n", 1518 info->host->host_no, fas216_target(info), 1519 fas216_bus_phase(stat), 1520 fas216_drv_phase(info)); 1521 print_debug_list(); 1522 return; 1523 1524bad_is: 1525 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS); 1526 fas216_dumpstate(info); 1527 print_debug_list(); 1528 1529 fas216_done(info, DID_ERROR); 1530} 1531 1532/** 1533 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip 1534 * @info: interface which caused function done interrupt 1535 * @stat: Status register contents 1536 * @is: SCSI Status register contents 1537 * 1538 * Handle a function done interrupt from FAS216 chip 1539 */ 1540static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1541{ 1542 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF; 1543 1544 fas216_checkmagic(info); 1545 1546 fas216_log(info, LOG_FUNCTIONDONE, 1547 "function done: stat=%02x is=%02x phase=%02x", 1548 stat, is, info->scsi.phase); 1549 1550 switch (info->scsi.phase) { 1551 case PHASE_STATUS: /* status phase - read status and msg */ 1552 if (fifo_len != 2) { 1553 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len); 1554 } 1555 /* 1556 * Read status then message byte. 1557 */ 1558 info->scsi.SCp.Status = fas216_readb(info, REG_FF); 1559 info->scsi.SCp.Message = fas216_readb(info, REG_FF); 1560 info->scsi.phase = PHASE_DONE; 1561 fas216_cmd(info, CMD_MSGACCEPTED); 1562 break; 1563 1564 case PHASE_IDLE: 1565 case PHASE_SELECTION: 1566 case PHASE_SELSTEPS: 1567 break; 1568 1569 case PHASE_MSGIN: /* message in phase */ 1570 if ((stat & STAT_BUSMASK) == STAT_MESGIN) { 1571 info->scsi.msgin_fifo = fifo_len; 1572 fas216_message(info); 1573 break; 1574 } 1575 1576 default: 1577 fas216_log(info, 0, "internal phase %s for function done?" 1578 " What do I do with this?", 1579 fas216_target(info), fas216_drv_phase(info)); 1580 } 1581} 1582 1583static void fas216_bus_reset(FAS216_Info *info) 1584{ 1585 neg_t sync_state; 1586 int i; 1587 1588 msgqueue_flush(&info->scsi.msgs); 1589 1590 sync_state = neg_invalid; 1591 1592#ifdef SCSI2_SYNC 1593 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA)) 1594 sync_state = neg_wait; 1595#endif 1596 1597 info->scsi.phase = PHASE_IDLE; 1598 info->SCpnt = NULL; /* bug! */ 1599 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp)); 1600 1601 for (i = 0; i < 8; i++) { 1602 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok; 1603 info->device[i].sync_state = sync_state; 1604 info->device[i].period = info->ifcfg.asyncperiod / 4; 1605 info->device[i].stp = info->scsi.async_stp; 1606 info->device[i].sof = 0; 1607 info->device[i].wide_xfer = 0; 1608 } 1609 1610 info->rst_bus_status = 1; 1611 wake_up(&info->eh_wait); 1612} 1613 1614/** 1615 * fas216_intr - handle interrupts to progress a command 1616 * @info: interface to service 1617 * 1618 * Handle interrupts from the interface to progress a command 1619 */ 1620irqreturn_t fas216_intr(FAS216_Info *info) 1621{ 1622 unsigned char inst, is, stat; 1623 int handled = IRQ_NONE; 1624 1625 fas216_checkmagic(info); 1626 1627 stat = fas216_readb(info, REG_STAT); 1628 is = fas216_readb(info, REG_IS); 1629 inst = fas216_readb(info, REG_INST); 1630 1631 add_debug_list(stat, is, inst, info->scsi.phase); 1632 1633 if (stat & STAT_INT) { 1634 if (inst & INST_BUSRESET) { 1635 fas216_log(info, 0, "bus reset detected"); 1636 fas216_bus_reset(info); 1637 scsi_report_bus_reset(info->host, 0); 1638 } else if (inst & INST_ILLEGALCMD) { 1639 fas216_log(info, LOG_ERROR, "illegal command given\n"); 1640 fas216_dumpstate(info); 1641 print_debug_list(); 1642 } else if (inst & INST_DISCONNECT) 1643 fas216_disconnect_intr(info); 1644 else if (inst & INST_RESELECTED) /* reselected */ 1645 fas216_reselected_intr(info); 1646 else if (inst & INST_BUSSERVICE) /* bus service request */ 1647 fas216_busservice_intr(info, stat, is); 1648 else if (inst & INST_FUNCDONE) /* function done */ 1649 fas216_funcdone_intr(info, stat, is); 1650 else 1651 fas216_log(info, 0, "unknown interrupt received:" 1652 " phase %s inst %02X is %02X stat %02X", 1653 fas216_drv_phase(info), inst, is, stat); 1654 handled = IRQ_HANDLED; 1655 } 1656 return handled; 1657} 1658 1659static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1660{ 1661 int tot_msglen; 1662 1663 /* following what the ESP driver says */ 1664 fas216_set_stc(info, 0); 1665 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1666 1667 /* flush FIFO */ 1668 fas216_cmd(info, CMD_FLUSHFIFO); 1669 1670 /* load bus-id and timeout */ 1671 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1672 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1673 1674 /* synchronous transfers */ 1675 fas216_set_sync(info, SCpnt->device->id); 1676 1677 tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1678 1679#ifdef DEBUG_MESSAGES 1680 { 1681 struct message *msg; 1682 int msgnr = 0, i; 1683 1684 printk("scsi%d.%c: message out: ", 1685 info->host->host_no, '0' + SCpnt->device->id); 1686 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1687 printk("{ "); 1688 for (i = 0; i < msg->length; i++) 1689 printk("%02x ", msg->msg[i]); 1690 printk("} "); 1691 } 1692 printk("\n"); 1693 } 1694#endif 1695 1696 if (tot_msglen == 1 || tot_msglen == 3) { 1697 /* 1698 * We have an easy message length to send... 1699 */ 1700 struct message *msg; 1701 int msgnr = 0, i; 1702 1703 info->scsi.phase = PHASE_SELSTEPS; 1704 1705 /* load message bytes */ 1706 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1707 for (i = 0; i < msg->length; i++) 1708 fas216_writeb(info, REG_FF, msg->msg[i]); 1709 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1710 } 1711 1712 /* load command */ 1713 for (i = 0; i < SCpnt->cmd_len; i++) 1714 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]); 1715 1716 if (tot_msglen == 1) 1717 fas216_cmd(info, CMD_SELECTATN); 1718 else 1719 fas216_cmd(info, CMD_SELECTATN3); 1720 } else { 1721 /* 1722 * We have an unusual number of message bytes to send. 1723 * Load first byte into fifo, and issue SELECT with ATN and 1724 * stop steps. 1725 */ 1726 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1727 1728 fas216_writeb(info, REG_FF, msg->msg[0]); 1729 msg->fifo = 1; 1730 1731 fas216_cmd(info, CMD_SELECTATNSTOP); 1732 } 1733} 1734 1735/* 1736 * Decide whether we need to perform a parity test on this device. 1737 * Can also be used to force parity error conditions during initial 1738 * information transfer phase (message out) for test purposes. 1739 */ 1740static int parity_test(FAS216_Info *info, int target) 1741{ 1742 return info->device[target].parity_check; 1743} 1744 1745static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1746{ 1747 int disconnect_ok; 1748 1749 /* 1750 * claim host busy 1751 */ 1752 info->scsi.phase = PHASE_SELECTION; 1753 info->scsi.SCp = SCpnt->SCp; 1754 info->SCpnt = SCpnt; 1755 info->dma.transfer_type = fasdma_none; 1756 1757 if (parity_test(info, SCpnt->device->id)) 1758 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE); 1759 else 1760 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1761 1762 /* 1763 * Don't allow request sense commands to disconnect. 1764 */ 1765 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE && 1766 info->device[SCpnt->device->id].disconnect_ok; 1767 1768 /* 1769 * build outgoing message bytes 1770 */ 1771 msgqueue_flush(&info->scsi.msgs); 1772 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun)); 1773 1774 /* 1775 * add tag message if required 1776 */ 1777 if (SCpnt->tag) 1778 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag); 1779 1780 do { 1781#ifdef SCSI2_SYNC 1782 if ((info->device[SCpnt->device->id].sync_state == neg_wait || 1783 info->device[SCpnt->device->id].sync_state == neg_complete) && 1784 (SCpnt->cmnd[0] == REQUEST_SENSE || 1785 SCpnt->cmnd[0] == INQUIRY)) { 1786 info->device[SCpnt->device->id].sync_state = neg_inprogress; 1787 msgqueue_addmsg(&info->scsi.msgs, 5, 1788 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1789 1000 / info->ifcfg.clockrate, 1790 info->ifcfg.sync_max_depth); 1791 break; 1792 } 1793#endif 1794 } while (0); 1795 1796 __fas216_start_command(info, SCpnt); 1797} 1798 1799static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1800{ 1801#ifdef SCSI2_TAG 1802 /* 1803 * tagged queuing - allocate a new tag to this command 1804 */ 1805 if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE && 1806 SCpnt->cmnd[0] != INQUIRY) { 1807 SCpnt->device->current_tag += 1; 1808 if (SCpnt->device->current_tag == 0) 1809 SCpnt->device->current_tag = 1; 1810 SCpnt->tag = SCpnt->device->current_tag; 1811 } else 1812#endif 1813 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns); 1814 1815 info->stats.removes += 1; 1816 switch (SCpnt->cmnd[0]) { 1817 case WRITE_6: 1818 case WRITE_10: 1819 case WRITE_12: 1820 info->stats.writes += 1; 1821 break; 1822 case READ_6: 1823 case READ_10: 1824 case READ_12: 1825 info->stats.reads += 1; 1826 break; 1827 default: 1828 info->stats.miscs += 1; 1829 break; 1830 } 1831} 1832 1833static void fas216_do_bus_device_reset(FAS216_Info *info, 1834 struct scsi_cmnd *SCpnt) 1835{ 1836 struct message *msg; 1837 1838 /* 1839 * claim host busy 1840 */ 1841 info->scsi.phase = PHASE_SELECTION; 1842 info->scsi.SCp = SCpnt->SCp; 1843 info->SCpnt = SCpnt; 1844 info->dma.transfer_type = fasdma_none; 1845 1846 fas216_log(info, LOG_ERROR, "sending bus device reset"); 1847 1848 msgqueue_flush(&info->scsi.msgs); 1849 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET); 1850 1851 /* following what the ESP driver says */ 1852 fas216_set_stc(info, 0); 1853 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1854 1855 /* flush FIFO */ 1856 fas216_cmd(info, CMD_FLUSHFIFO); 1857 1858 /* load bus-id and timeout */ 1859 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1860 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1861 1862 /* synchronous transfers */ 1863 fas216_set_sync(info, SCpnt->device->id); 1864 1865 msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1866 1867 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET); 1868 msg->fifo = 1; 1869 1870 fas216_cmd(info, CMD_SELECTATNSTOP); 1871} 1872 1873/** 1874 * fas216_kick - kick a command to the interface 1875 * @info: our host interface to kick 1876 * 1877 * Kick a command to the interface, interface should be idle. 1878 * Notes: Interrupts are always disabled! 1879 */ 1880static void fas216_kick(FAS216_Info *info) 1881{ 1882 struct scsi_cmnd *SCpnt = NULL; 1883#define TYPE_OTHER 0 1884#define TYPE_RESET 1 1885#define TYPE_QUEUE 2 1886 int where_from = TYPE_OTHER; 1887 1888 fas216_checkmagic(info); 1889 1890 /* 1891 * Obtain the next command to process. 1892 */ 1893 do { 1894 if (info->rstSCpnt) { 1895 SCpnt = info->rstSCpnt; 1896 /* don't remove it */ 1897 where_from = TYPE_RESET; 1898 break; 1899 } 1900 1901 if (info->reqSCpnt) { 1902 SCpnt = info->reqSCpnt; 1903 info->reqSCpnt = NULL; 1904 break; 1905 } 1906 1907 if (info->origSCpnt) { 1908 SCpnt = info->origSCpnt; 1909 info->origSCpnt = NULL; 1910 break; 1911 } 1912 1913 /* retrieve next command */ 1914 if (!SCpnt) { 1915 SCpnt = queue_remove_exclude(&info->queues.issue, 1916 info->busyluns); 1917 where_from = TYPE_QUEUE; 1918 break; 1919 } 1920 } while (0); 1921 1922 if (!SCpnt) { 1923 /* 1924 * no command pending, so enable reselection. 1925 */ 1926 fas216_cmd(info, CMD_ENABLESEL); 1927 return; 1928 } 1929 1930 /* 1931 * We're going to start a command, so disable reselection 1932 */ 1933 fas216_cmd(info, CMD_DISABLESEL); 1934 1935 if (info->scsi.disconnectable && info->SCpnt) { 1936 fas216_log(info, LOG_CONNECT, 1937 "moved command for %d to disconnected queue", 1938 info->SCpnt->device->id); 1939 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 1940 info->scsi.disconnectable = 0; 1941 info->SCpnt = NULL; 1942 } 1943 1944 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt, 1945 "starting"); 1946 1947 switch (where_from) { 1948 case TYPE_QUEUE: 1949 fas216_allocate_tag(info, SCpnt); 1950 case TYPE_OTHER: 1951 fas216_start_command(info, SCpnt); 1952 break; 1953 case TYPE_RESET: 1954 fas216_do_bus_device_reset(info, SCpnt); 1955 break; 1956 } 1957 1958 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]", 1959 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1960 1961 /* 1962 * should now get either DISCONNECT or 1963 * (FUNCTION DONE with BUS SERVICE) interrupt 1964 */ 1965} 1966 1967/* 1968 * Clean up from issuing a BUS DEVICE RESET message to a device. 1969 */ 1970static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 1971 unsigned int result) 1972{ 1973 fas216_log(info, LOG_ERROR, "fas216 device reset complete"); 1974 1975 info->rstSCpnt = NULL; 1976 info->rst_dev_status = 1; 1977 wake_up(&info->eh_wait); 1978} 1979 1980/** 1981 * fas216_rq_sns_done - Finish processing automatic request sense command 1982 * @info: interface that completed 1983 * @SCpnt: command that completed 1984 * @result: driver byte of result 1985 * 1986 * Finish processing automatic request sense command 1987 */ 1988static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 1989 unsigned int result) 1990{ 1991 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 1992 "request sense complete, result=0x%04x%02x%02x", 1993 result, SCpnt->SCp.Message, SCpnt->SCp.Status); 1994 1995 if (result != DID_OK || SCpnt->SCp.Status != GOOD) 1996 /* 1997 * Something went wrong. Make sure that we don't 1998 * have valid data in the sense buffer that could 1999 * confuse the higher levels. 2000 */ 2001 memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer)); 2002//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id); 2003//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); } 2004 /* 2005 * Note that we don't set SCpnt->result, since that should 2006 * reflect the status of the command that we were asked by 2007 * the upper layers to process. This would have been set 2008 * correctly by fas216_std_done. 2009 */ 2010 SCpnt->scsi_done(SCpnt); 2011} 2012 2013/** 2014 * fas216_std_done - finish processing of standard command 2015 * @info: interface that completed 2016 * @SCpnt: command that completed 2017 * @result: driver byte of result 2018 * 2019 * Finish processing of standard command 2020 */ 2021static void 2022fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) 2023{ 2024 info->stats.fins += 1; 2025 2026 SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 | 2027 info->scsi.SCp.Status; 2028 2029 fas216_log_command(info, LOG_CONNECT, SCpnt, 2030 "command complete, result=0x%08x", SCpnt->result); 2031 2032 /* 2033 * If the driver detected an error, we're all done. 2034 */ 2035 if (host_byte(SCpnt->result) != DID_OK || 2036 msg_byte(SCpnt->result) != COMMAND_COMPLETE) 2037 goto done; 2038 2039 /* 2040 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED 2041 * status, request the sense information. 2042 */ 2043 if (status_byte(SCpnt->result) == CHECK_CONDITION || 2044 status_byte(SCpnt->result) == COMMAND_TERMINATED) 2045 goto request_sense; 2046 2047 /* 2048 * If the command did not complete with GOOD status, 2049 * we are all done here. 2050 */ 2051 if (status_byte(SCpnt->result) != GOOD) 2052 goto done; 2053 2054 /* 2055 * We have successfully completed a command. Make sure that 2056 * we do not have any buffers left to transfer. The world 2057 * is not perfect, and we seem to occasionally hit this. 2058 * It can be indicative of a buggy driver, target or the upper 2059 * levels of the SCSI code. 2060 */ 2061 if (info->scsi.SCp.ptr) { 2062 switch (SCpnt->cmnd[0]) { 2063 case INQUIRY: 2064 case START_STOP: 2065 case MODE_SENSE: 2066 break; 2067 2068 default: 2069 printk(KERN_ERR "scsi%d.%c: incomplete data transfer " 2070 "detected: res=%08X ptr=%p len=%X CDB: ", 2071 info->host->host_no, '0' + SCpnt->device->id, 2072 SCpnt->result, info->scsi.SCp.ptr, 2073 info->scsi.SCp.this_residual); 2074 __scsi_print_command(SCpnt->cmnd); 2075 SCpnt->result &= ~(255 << 16); 2076 SCpnt->result |= DID_BAD_TARGET << 16; 2077 goto request_sense; 2078 } 2079 } 2080 2081done: 2082 if (SCpnt->scsi_done) { 2083 SCpnt->scsi_done(SCpnt); 2084 return; 2085 } 2086 2087 panic("scsi%d.H: null scsi_done function in fas216_done", 2088 info->host->host_no); 2089 2090 2091request_sense: 2092 if (SCpnt->cmnd[0] == REQUEST_SENSE) 2093 goto done; 2094 2095 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2096 "requesting sense"); 2097 memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd)); 2098 SCpnt->cmnd[0] = REQUEST_SENSE; 2099 SCpnt->cmnd[1] = SCpnt->device->lun << 5; 2100 SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer); 2101 SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]); 2102 SCpnt->SCp.buffer = NULL; 2103 SCpnt->SCp.buffers_residual = 0; 2104 SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer; 2105 SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer); 2106 SCpnt->SCp.phase = sizeof(SCpnt->sense_buffer); 2107 SCpnt->SCp.Message = 0; 2108 SCpnt->SCp.Status = 0; 2109 SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer); 2110 SCpnt->sc_data_direction = DMA_FROM_DEVICE; 2111 SCpnt->use_sg = 0; 2112 SCpnt->tag = 0; 2113 SCpnt->host_scribble = (void *)fas216_rq_sns_done; 2114 2115 /* 2116 * Place this command into the high priority "request 2117 * sense" slot. This will be the very next command 2118 * executed, unless a target connects to us. 2119 */ 2120 if (info->reqSCpnt) 2121 printk(KERN_WARNING "scsi%d.%c: loosing request command\n", 2122 info->host->host_no, '0' + SCpnt->device->id); 2123 info->reqSCpnt = SCpnt; 2124} 2125 2126/** 2127 * fas216_done - complete processing for current command 2128 * @info: interface that completed 2129 * @result: driver byte of result 2130 * 2131 * Complete processing for current command 2132 */ 2133static void fas216_done(FAS216_Info *info, unsigned int result) 2134{ 2135 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int); 2136 struct scsi_cmnd *SCpnt; 2137 unsigned long flags; 2138 2139 fas216_checkmagic(info); 2140 2141 if (!info->SCpnt) 2142 goto no_command; 2143 2144 SCpnt = info->SCpnt; 2145 info->SCpnt = NULL; 2146 info->scsi.phase = PHASE_IDLE; 2147 2148 if (info->scsi.aborting) { 2149 fas216_log(info, 0, "uncaught abort - returning DID_ABORT"); 2150 result = DID_ABORT; 2151 info->scsi.aborting = 0; 2152 } 2153 2154 /* 2155 * Sanity check the completion - if we have zero bytes left 2156 * to transfer, we should not have a valid pointer. 2157 */ 2158 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) { 2159 printk("scsi%d.%c: zero bytes left to transfer, but " 2160 "buffer pointer still valid: ptr=%p len=%08x CDB: ", 2161 info->host->host_no, '0' + SCpnt->device->id, 2162 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 2163 info->scsi.SCp.ptr = NULL; 2164 __scsi_print_command(SCpnt->cmnd); 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 + SCpnt->device->lun, info->busyluns); 2174 2175 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble; 2176 fn(info, SCpnt, result); 2177 2178 if (info->scsi.irq != NO_IRQ) { 2179 spin_lock_irqsave(&info->host_lock, flags); 2180 if (info->scsi.phase == PHASE_IDLE) 2181 fas216_kick(info); 2182 spin_unlock_irqrestore(&info->host_lock, flags); 2183 } 2184 return; 2185 2186no_command: 2187 panic("scsi%d.H: null command in fas216_done", 2188 info->host->host_no); 2189} 2190 2191/** 2192 * fas216_queue_command - queue a command for adapter to process. 2193 * @SCpnt: Command to queue 2194 * @done: done function to call once command is complete 2195 * 2196 * Queue a command for adapter to process. 2197 * Returns: 0 on success, else error. 2198 * Notes: io_request_lock is held, interrupts are disabled. 2199 */ 2200int fas216_queue_command(struct scsi_cmnd *SCpnt, 2201 void (*done)(struct scsi_cmnd *)) 2202{ 2203 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2204 int result; 2205 2206 fas216_checkmagic(info); 2207 2208 fas216_log_command(info, LOG_CONNECT, SCpnt, 2209 "received command (%p)", SCpnt); 2210 2211 SCpnt->scsi_done = done; 2212 SCpnt->host_scribble = (void *)fas216_std_done; 2213 SCpnt->result = 0; 2214 2215 init_SCp(SCpnt); 2216 2217 info->stats.queues += 1; 2218 SCpnt->tag = 0; 2219 2220 spin_lock(&info->host_lock); 2221 2222 /* 2223 * Add command into execute queue and let it complete under 2224 * whatever scheme we're using. 2225 */ 2226 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt); 2227 2228 /* 2229 * If we successfully added the command, 2230 * kick the interface to get it moving. 2231 */ 2232 if (result == 0 && info->scsi.phase == PHASE_IDLE) 2233 fas216_kick(info); 2234 spin_unlock(&info->host_lock); 2235 2236 fas216_log_target(info, LOG_CONNECT, -1, "queue %s", 2237 result ? "failure" : "success"); 2238 2239 return result; 2240} 2241 2242/** 2243 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command 2244 * @SCpnt: Command to wake 2245 * 2246 * Trigger restart of a waiting thread in fas216_command 2247 */ 2248static void fas216_internal_done(struct scsi_cmnd *SCpnt) 2249{ 2250 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2251 2252 fas216_checkmagic(info); 2253 2254 info->internal_done = 1; 2255} 2256 2257/** 2258 * fas216_noqueue_command - process a command for the adapter. 2259 * @SCpnt: Command to queue 2260 * 2261 * Queue a command for adapter to process. 2262 * Returns: scsi result code. 2263 * Notes: io_request_lock is held, interrupts are disabled. 2264 */ 2265int fas216_noqueue_command(struct scsi_cmnd *SCpnt, 2266 void (*done)(struct scsi_cmnd *)) 2267{ 2268 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2269 2270 fas216_checkmagic(info); 2271 2272 /* 2273 * We should only be using this if we don't have an interrupt. 2274 * Provide some "incentive" to use the queueing code. 2275 */ 2276 BUG_ON(info->scsi.irq != NO_IRQ); 2277 2278 info->internal_done = 0; 2279 fas216_queue_command(SCpnt, fas216_internal_done); 2280 2281 /* 2282 * This wastes time, since we can't return until the command is 2283 * complete. We can't sleep either since we may get re-entered! 2284 * However, we must re-enable interrupts, or else we'll be 2285 * waiting forever. 2286 */ 2287 spin_unlock_irq(info->host->host_lock); 2288 2289 while (!info->internal_done) { 2290 /* 2291 * If we don't have an IRQ, then we must poll the card for 2292 * it's interrupt, and use that to call this driver's 2293 * interrupt routine. That way, we keep the command 2294 * progressing. Maybe we can add some inteligence here 2295 * and go to sleep if we know that the device is going 2296 * to be some time (eg, disconnected). 2297 */ 2298 if (fas216_readb(info, REG_STAT) & STAT_INT) { 2299 spin_lock_irq(info->host->host_lock); 2300 fas216_intr(info); 2301 spin_unlock_irq(info->host->host_lock); 2302 } 2303 } 2304 2305 spin_lock_irq(info->host->host_lock); 2306 2307 done(SCpnt); 2308 2309 return 0; 2310} 2311 2312/* 2313 * Error handler timeout function. Indicate that we timed out, 2314 * and wake up any error handler process so it can continue. 2315 */ 2316static void fas216_eh_timer(unsigned long data) 2317{ 2318 FAS216_Info *info = (FAS216_Info *)data; 2319 2320 fas216_log(info, LOG_ERROR, "error handling timed out\n"); 2321 2322 del_timer(&info->eh_timer); 2323 2324 if (info->rst_bus_status == 0) 2325 info->rst_bus_status = -1; 2326 if (info->rst_dev_status == 0) 2327 info->rst_dev_status = -1; 2328 2329 wake_up(&info->eh_wait); 2330} 2331 2332enum res_find { 2333 res_failed, /* not found */ 2334 res_success, /* command on issue queue */ 2335 res_hw_abort /* command on disconnected dev */ 2336}; 2337 2338/** 2339 * fas216_do_abort - decide how to abort a command 2340 * @SCpnt: command to abort 2341 * 2342 * Decide how to abort a command. 2343 * Returns: abort status 2344 */ 2345static enum res_find fas216_find_command(FAS216_Info *info, 2346 struct scsi_cmnd *SCpnt) 2347{ 2348 enum res_find res = res_failed; 2349 2350 if (queue_remove_cmd(&info->queues.issue, SCpnt)) { 2351 /* 2352 * The command was on the issue queue, and has not been 2353 * issued yet. We can remove the command from the queue, 2354 * and acknowledge the abort. Neither the device nor the 2355 * interface know about the command. 2356 */ 2357 printk("on issue queue "); 2358 2359 res = res_success; 2360 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) { 2361 /* 2362 * The command was on the disconnected queue. We must 2363 * reconnect with the device if possible, and send it 2364 * an abort message. 2365 */ 2366 printk("on disconnected queue "); 2367 2368 res = res_hw_abort; 2369 } else if (info->SCpnt == SCpnt) { 2370 printk("executing "); 2371 2372 switch (info->scsi.phase) { 2373 /* 2374 * If the interface is idle, and the command is 'disconnectable', 2375 * then it is the same as on the disconnected queue. 2376 */ 2377 case PHASE_IDLE: 2378 if (info->scsi.disconnectable) { 2379 info->scsi.disconnectable = 0; 2380 info->SCpnt = NULL; 2381 res = res_hw_abort; 2382 } 2383 break; 2384 2385 default: 2386 break; 2387 } 2388 } else if (info->origSCpnt == SCpnt) { 2389 /* 2390 * The command will be executed next, but a command 2391 * is currently using the interface. This is similar to 2392 * being on the issue queue, except the busylun bit has 2393 * been set. 2394 */ 2395 info->origSCpnt = NULL; 2396 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns); 2397 printk("waiting for execution "); 2398 res = res_success; 2399 } else 2400 printk("unknown "); 2401 2402 return res; 2403} 2404 2405/** 2406 * fas216_eh_abort - abort this command 2407 * @SCpnt: command to abort 2408 * 2409 * Abort this command. 2410 * Returns: FAILED if unable to abort 2411 * Notes: io_request_lock is taken, and irqs are disabled 2412 */ 2413int fas216_eh_abort(struct scsi_cmnd *SCpnt) 2414{ 2415 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2416 int result = FAILED; 2417 2418 fas216_checkmagic(info); 2419 2420 info->stats.aborts += 1; 2421 2422 printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no); 2423 __scsi_print_command(SCpnt->cmnd); 2424 2425 print_debug_list(); 2426 fas216_dumpstate(info); 2427 2428 printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt); 2429 2430 switch (fas216_find_command(info, SCpnt)) { 2431 /* 2432 * We found the command, and cleared it out. Either 2433 * the command is still known to be executing on the 2434 * target, or the busylun bit is not set. 2435 */ 2436 case res_success: 2437 printk("success\n"); 2438 result = SUCCESS; 2439 break; 2440 2441 /* 2442 * We need to reconnect to the target and send it an 2443 * ABORT or ABORT_TAG message. We can only do this 2444 * if the bus is free. 2445 */ 2446 case res_hw_abort: 2447 2448 2449 /* 2450 * We are unable to abort the command for some reason. 2451 */ 2452 default: 2453 case res_failed: 2454 printk("failed\n"); 2455 break; 2456 } 2457 2458 return result; 2459} 2460 2461/** 2462 * fas216_eh_device_reset - Reset the device associated with this command 2463 * @SCpnt: command specifing device to reset 2464 * 2465 * Reset the device associated with this command. 2466 * Returns: FAILED if unable to reset. 2467 * Notes: We won't be re-entered, so we'll only have one device 2468 * reset on the go at one time. 2469 */ 2470int fas216_eh_device_reset(struct scsi_cmnd *SCpnt) 2471{ 2472 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2473 unsigned long flags; 2474 int i, res = FAILED, target = SCpnt->device->id; 2475 2476 fas216_log(info, LOG_ERROR, "device reset for target %d", target); 2477 2478 spin_lock_irqsave(&info->host_lock, flags); 2479 2480 do { 2481 /* 2482 * If we are currently connected to a device, and 2483 * it is the device we want to reset, there is 2484 * nothing we can do here. Chances are it is stuck, 2485 * and we need a bus reset. 2486 */ 2487 if (info->SCpnt && !info->scsi.disconnectable && 2488 info->SCpnt->device->id == SCpnt->device->id) 2489 break; 2490 2491 /* 2492 * We're going to be resetting this device. Remove 2493 * all pending commands from the driver. By doing 2494 * so, we guarantee that we won't touch the command 2495 * structures except to process the reset request. 2496 */ 2497 queue_remove_all_target(&info->queues.issue, target); 2498 queue_remove_all_target(&info->queues.disconnected, target); 2499 if (info->origSCpnt && info->origSCpnt->device->id == target) 2500 info->origSCpnt = NULL; 2501 if (info->reqSCpnt && info->reqSCpnt->device->id == target) 2502 info->reqSCpnt = NULL; 2503 for (i = 0; i < 8; i++) 2504 clear_bit(target * 8 + i, info->busyluns); 2505 2506 /* 2507 * Hijack this SCSI command structure to send 2508 * a bus device reset message to this device. 2509 */ 2510 SCpnt->host_scribble = (void *)fas216_devicereset_done; 2511 2512 info->rst_dev_status = 0; 2513 info->rstSCpnt = SCpnt; 2514 2515 if (info->scsi.phase == PHASE_IDLE) 2516 fas216_kick(info); 2517 2518 mod_timer(&info->eh_timer, 30 * HZ); 2519 spin_unlock_irqrestore(&info->host_lock, flags); 2520 2521 /* 2522 * Wait up to 30 seconds for the reset to complete. 2523 */ 2524 wait_event(info->eh_wait, info->rst_dev_status); 2525 2526 del_timer_sync(&info->eh_timer); 2527 spin_lock_irqsave(&info->host_lock, flags); 2528 info->rstSCpnt = NULL; 2529 2530 if (info->rst_dev_status == 1) 2531 res = SUCCESS; 2532 } while (0); 2533 2534 SCpnt->host_scribble = NULL; 2535 spin_unlock_irqrestore(&info->host_lock, flags); 2536 2537 fas216_log(info, LOG_ERROR, "device reset complete: %s\n", 2538 res == SUCCESS ? "success" : "failed"); 2539 2540 return res; 2541} 2542 2543/** 2544 * fas216_eh_bus_reset - Reset the bus associated with the command 2545 * @SCpnt: command specifing bus to reset 2546 * 2547 * Reset the bus associated with the command. 2548 * Returns: FAILED if unable to reset. 2549 * Notes: Further commands are blocked. 2550 */ 2551int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt) 2552{ 2553 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2554 unsigned long flags; 2555 struct scsi_device *SDpnt; 2556 2557 fas216_checkmagic(info); 2558 fas216_log(info, LOG_ERROR, "resetting bus"); 2559 2560 info->stats.bus_resets += 1; 2561 2562 spin_lock_irqsave(&info->host_lock, flags); 2563 2564 /* 2565 * Stop all activity on this interface. 2566 */ 2567 fas216_aborttransfer(info); 2568 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2569 2570 /* 2571 * Clear any pending interrupts. 2572 */ 2573 while (fas216_readb(info, REG_STAT) & STAT_INT) 2574 fas216_readb(info, REG_INST); 2575 2576 info->rst_bus_status = 0; 2577 2578 /* 2579 * For each attached hard-reset device, clear out 2580 * all command structures. Leave the running 2581 * command in place. 2582 */ 2583 shost_for_each_device(SDpnt, info->host) { 2584 int i; 2585 2586 if (SDpnt->soft_reset) 2587 continue; 2588 2589 queue_remove_all_target(&info->queues.issue, SDpnt->id); 2590 queue_remove_all_target(&info->queues.disconnected, SDpnt->id); 2591 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id) 2592 info->origSCpnt = NULL; 2593 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id) 2594 info->reqSCpnt = NULL; 2595 info->SCpnt = NULL; 2596 2597 for (i = 0; i < 8; i++) 2598 clear_bit(SDpnt->id * 8 + i, info->busyluns); 2599 } 2600 2601 info->scsi.phase = PHASE_IDLE; 2602 2603 /* 2604 * Reset the SCSI bus. Device cleanup happens in 2605 * the interrupt handler. 2606 */ 2607 fas216_cmd(info, CMD_RESETSCSI); 2608 2609 mod_timer(&info->eh_timer, jiffies + HZ); 2610 spin_unlock_irqrestore(&info->host_lock, flags); 2611 2612 /* 2613 * Wait one second for the interrupt. 2614 */ 2615 wait_event(info->eh_wait, info->rst_bus_status); 2616 del_timer_sync(&info->eh_timer); 2617 2618 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n", 2619 info->rst_bus_status == 1 ? "success" : "failed"); 2620 2621 return info->rst_bus_status == 1 ? SUCCESS : FAILED; 2622} 2623 2624/** 2625 * fas216_init_chip - Initialise FAS216 state after reset 2626 * @info: state structure for interface 2627 * 2628 * Initialise FAS216 state after reset 2629 */ 2630static void fas216_init_chip(FAS216_Info *info) 2631{ 2632 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7; 2633 fas216_writeb(info, REG_CLKF, clock); 2634 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2635 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]); 2636 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2637 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 2638 fas216_writeb(info, REG_SOF, 0); 2639 fas216_writeb(info, REG_STP, info->scsi.async_stp); 2640 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2641} 2642 2643/** 2644 * fas216_eh_host_reset - Reset the host associated with this command 2645 * @SCpnt: command specifing host to reset 2646 * 2647 * Reset the host associated with this command. 2648 * Returns: FAILED if unable to reset. 2649 * Notes: io_request_lock is taken, and irqs are disabled 2650 */ 2651int fas216_eh_host_reset(struct scsi_cmnd *SCpnt) 2652{ 2653 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2654 2655 spin_lock_irq(info->host->host_lock); 2656 2657 fas216_checkmagic(info); 2658 2659 printk("scsi%d.%c: %s: resetting host\n", 2660 info->host->host_no, '0' + SCpnt->device->id, __FUNCTION__); 2661 2662 /* 2663 * Reset the SCSI chip. 2664 */ 2665 fas216_cmd(info, CMD_RESETCHIP); 2666 2667 /* 2668 * Ugly ugly ugly! 2669 * We need to release the host_lock and enable 2670 * IRQs if we sleep, but we must relock and disable 2671 * IRQs after the sleep. 2672 */ 2673 spin_unlock_irq(info->host->host_lock); 2674 msleep(50 * 1000/100); 2675 spin_lock_irq(info->host->host_lock); 2676 2677 /* 2678 * Release the SCSI reset. 2679 */ 2680 fas216_cmd(info, CMD_NOP); 2681 2682 fas216_init_chip(info); 2683 2684 spin_unlock_irq(info->host->host_lock); 2685 return SUCCESS; 2686} 2687 2688#define TYPE_UNKNOWN 0 2689#define TYPE_NCR53C90 1 2690#define TYPE_NCR53C90A 2 2691#define TYPE_NCR53C9x 3 2692#define TYPE_Am53CF94 4 2693#define TYPE_EmFAS216 5 2694#define TYPE_QLFAS216 6 2695 2696static char *chip_types[] = { 2697 "unknown", 2698 "NS NCR53C90", 2699 "NS NCR53C90A", 2700 "NS NCR53C9x", 2701 "AMD Am53CF94", 2702 "Emulex FAS216", 2703 "QLogic FAS216" 2704}; 2705 2706static int fas216_detect_type(FAS216_Info *info) 2707{ 2708 int family, rev; 2709 2710 /* 2711 * Reset the chip. 2712 */ 2713 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2714 udelay(50); 2715 fas216_writeb(info, REG_CMD, CMD_NOP); 2716 2717 /* 2718 * Check to see if control reg 2 is present. 2719 */ 2720 fas216_writeb(info, REG_CNTL3, 0); 2721 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE); 2722 2723 /* 2724 * If we are unable to read back control reg 2 2725 * correctly, it is not present, and we have a 2726 * NCR53C90. 2727 */ 2728 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE) 2729 return TYPE_NCR53C90; 2730 2731 /* 2732 * Now, check control register 3 2733 */ 2734 fas216_writeb(info, REG_CNTL2, 0); 2735 fas216_writeb(info, REG_CNTL3, 0); 2736 fas216_writeb(info, REG_CNTL3, 5); 2737 2738 /* 2739 * If we are unable to read the register back 2740 * correctly, we have a NCR53C90A 2741 */ 2742 if (fas216_readb(info, REG_CNTL3) != 5) 2743 return TYPE_NCR53C90A; 2744 2745 /* 2746 * Now read the ID from the chip. 2747 */ 2748 fas216_writeb(info, REG_CNTL3, 0); 2749 2750 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK); 2751 fas216_writeb(info, REG_CNTL3, 0); 2752 2753 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2754 udelay(50); 2755 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP); 2756 2757 fas216_writeb(info, REG_CNTL2, CNTL2_ENF); 2758 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2759 udelay(50); 2760 fas216_writeb(info, REG_CMD, CMD_NOP); 2761 2762 rev = fas216_readb(info, REG_ID); 2763 family = rev >> 3; 2764 rev &= 7; 2765 2766 switch (family) { 2767 case 0x01: 2768 if (rev == 4) 2769 return TYPE_Am53CF94; 2770 break; 2771 2772 case 0x02: 2773 switch (rev) { 2774 case 2: 2775 return TYPE_EmFAS216; 2776 case 3: 2777 return TYPE_QLFAS216; 2778 } 2779 break; 2780 2781 default: 2782 break; 2783 } 2784 printk("family %x rev %x\n", family, rev); 2785 return TYPE_NCR53C9x; 2786} 2787 2788/** 2789 * fas216_reset_state - Initialise driver internal state 2790 * @info: state to initialise 2791 * 2792 * Initialise driver internal state 2793 */ 2794static void fas216_reset_state(FAS216_Info *info) 2795{ 2796 int i; 2797 2798 fas216_checkmagic(info); 2799 2800 fas216_bus_reset(info); 2801 2802 /* 2803 * Clear out all stale info in our state structure 2804 */ 2805 memset(info->busyluns, 0, sizeof(info->busyluns)); 2806 info->scsi.disconnectable = 0; 2807 info->scsi.aborting = 0; 2808 2809 for (i = 0; i < 8; i++) { 2810 info->device[i].parity_enabled = 0; 2811 info->device[i].parity_check = 1; 2812 } 2813 2814 /* 2815 * Drain all commands on disconnected queue 2816 */ 2817 while (queue_remove(&info->queues.disconnected) != NULL); 2818 2819 /* 2820 * Remove executing commands. 2821 */ 2822 info->SCpnt = NULL; 2823 info->reqSCpnt = NULL; 2824 info->rstSCpnt = NULL; 2825 info->origSCpnt = NULL; 2826} 2827 2828/** 2829 * fas216_init - initialise FAS/NCR/AMD SCSI structures. 2830 * @host: a driver-specific filled-out structure 2831 * 2832 * Initialise FAS/NCR/AMD SCSI structures. 2833 * Returns: 0 on success 2834 */ 2835int fas216_init(struct Scsi_Host *host) 2836{ 2837 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2838 2839 info->magic_start = MAGIC; 2840 info->magic_end = MAGIC; 2841 info->host = host; 2842 info->scsi.cfg[0] = host->this_id | CNTL1_PERE; 2843 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE; 2844 info->scsi.cfg[2] = info->ifcfg.cntl3 | 2845 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM; 2846 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod); 2847 2848 info->rst_dev_status = -1; 2849 info->rst_bus_status = -1; 2850 init_waitqueue_head(&info->eh_wait); 2851 init_timer(&info->eh_timer); 2852 info->eh_timer.data = (unsigned long)info; 2853 info->eh_timer.function = fas216_eh_timer; 2854 2855 spin_lock_init(&info->host_lock); 2856 2857 memset(&info->stats, 0, sizeof(info->stats)); 2858 2859 msgqueue_initialise(&info->scsi.msgs); 2860 2861 if (!queue_initialise(&info->queues.issue)) 2862 return -ENOMEM; 2863 2864 if (!queue_initialise(&info->queues.disconnected)) { 2865 queue_free(&info->queues.issue); 2866 return -ENOMEM; 2867 } 2868 2869 return 0; 2870} 2871 2872/** 2873 * fas216_add - initialise FAS/NCR/AMD SCSI ic. 2874 * @host: a driver-specific filled-out structure 2875 * @dev: parent device 2876 * 2877 * Initialise FAS/NCR/AMD SCSI ic. 2878 * Returns: 0 on success 2879 */ 2880int fas216_add(struct Scsi_Host *host, struct device *dev) 2881{ 2882 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2883 int type, ret; 2884 2885 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) { 2886 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n", 2887 info->ifcfg.clockrate); 2888 return -EINVAL; 2889 } 2890 2891 fas216_reset_state(info); 2892 type = fas216_detect_type(info); 2893 info->scsi.type = chip_types[type]; 2894 2895 udelay(300); 2896 2897 /* 2898 * Initialise the chip correctly. 2899 */ 2900 fas216_init_chip(info); 2901 2902 /* 2903 * Reset the SCSI bus. We don't want to see 2904 * the resulting reset interrupt, so mask it 2905 * out. 2906 */ 2907 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR); 2908 fas216_writeb(info, REG_CMD, CMD_RESETSCSI); 2909 2910 /* 2911 * scsi standard says wait 250ms 2912 */ 2913 spin_unlock_irq(info->host->host_lock); 2914 msleep(100*1000/100); 2915 spin_lock_irq(info->host->host_lock); 2916 2917 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2918 fas216_readb(info, REG_INST); 2919 2920 fas216_checkmagic(info); 2921 2922 ret = scsi_add_host(host, dev); 2923 if (ret) 2924 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2925 else 2926 scsi_scan_host(host); 2927 2928 return ret; 2929} 2930 2931void fas216_remove(struct Scsi_Host *host) 2932{ 2933 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2934 2935 fas216_checkmagic(info); 2936 scsi_remove_host(host); 2937 2938 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2939 scsi_host_put(host); 2940} 2941 2942/** 2943 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic. 2944 * @host: a driver-specific filled-out structure 2945 * 2946 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic. 2947 */ 2948void fas216_release(struct Scsi_Host *host) 2949{ 2950 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2951 2952 queue_free(&info->queues.disconnected); 2953 queue_free(&info->queues.issue); 2954} 2955 2956int fas216_print_host(FAS216_Info *info, char *buffer) 2957{ 2958 return sprintf(buffer, 2959 "\n" 2960 "Chip : %s\n" 2961 " Address: 0x%p\n" 2962 " IRQ : %d\n" 2963 " DMA : %d\n", 2964 info->scsi.type, info->scsi.io_base, 2965 info->scsi.irq, info->scsi.dma); 2966} 2967 2968int fas216_print_stats(FAS216_Info *info, char *buffer) 2969{ 2970 char *p = buffer; 2971 2972 p += sprintf(p, "\n" 2973 "Command Statistics:\n" 2974 " Queued : %u\n" 2975 " Issued : %u\n" 2976 " Completed : %u\n" 2977 " Reads : %u\n" 2978 " Writes : %u\n" 2979 " Others : %u\n" 2980 " Disconnects: %u\n" 2981 " Aborts : %u\n" 2982 " Bus resets : %u\n" 2983 " Host resets: %u\n", 2984 info->stats.queues, info->stats.removes, 2985 info->stats.fins, info->stats.reads, 2986 info->stats.writes, info->stats.miscs, 2987 info->stats.disconnects, info->stats.aborts, 2988 info->stats.bus_resets, info->stats.host_resets); 2989 2990 return p - buffer; 2991} 2992 2993int fas216_print_devices(FAS216_Info *info, char *buffer) 2994{ 2995 struct fas216_device *dev; 2996 struct scsi_device *scd; 2997 char *p = buffer; 2998 2999 p += sprintf(p, "Device/Lun TaggedQ Parity Sync\n"); 3000 3001 shost_for_each_device(scd, info->host) { 3002 dev = &info->device[scd->id]; 3003 p += sprintf(p, " %d/%d ", scd->id, scd->lun); 3004 if (scd->tagged_supported) 3005 p += sprintf(p, "%3sabled(%3d) ", 3006 scd->simple_tags ? "en" : "dis", 3007 scd->current_tag); 3008 else 3009 p += sprintf(p, "unsupported "); 3010 3011 p += sprintf(p, "%3sabled ", dev->parity_enabled ? "en" : "dis"); 3012 3013 if (dev->sof) 3014 p += sprintf(p, "offset %d, %d ns\n", 3015 dev->sof, dev->period * 4); 3016 else 3017 p += sprintf(p, "async\n"); 3018 } 3019 3020 return p - buffer; 3021} 3022 3023EXPORT_SYMBOL(fas216_init); 3024EXPORT_SYMBOL(fas216_add); 3025EXPORT_SYMBOL(fas216_queue_command); 3026EXPORT_SYMBOL(fas216_noqueue_command); 3027EXPORT_SYMBOL(fas216_intr); 3028EXPORT_SYMBOL(fas216_remove); 3029EXPORT_SYMBOL(fas216_release); 3030EXPORT_SYMBOL(fas216_eh_abort); 3031EXPORT_SYMBOL(fas216_eh_device_reset); 3032EXPORT_SYMBOL(fas216_eh_bus_reset); 3033EXPORT_SYMBOL(fas216_eh_host_reset); 3034EXPORT_SYMBOL(fas216_print_host); 3035EXPORT_SYMBOL(fas216_print_stats); 3036EXPORT_SYMBOL(fas216_print_devices); 3037 3038MODULE_AUTHOR("Russell King"); 3039MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core"); 3040MODULE_LICENSE("GPL"); 3041