1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/acorn/scsi/fas216.c 4 * 5 * Copyright (C) 1997-2003 Russell King 6 * 7 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and 8 * other sources, including: 9 * the AMD Am53CF94 data sheet 10 * the AMD Am53C94 data sheet 11 * 12 * This is a generic driver. To use it, have a look at cumana_2.c. You 13 * should define your own structure that overlays FAS216_Info, eg: 14 * struct my_host_data { 15 * FAS216_Info info; 16 * ... my host specific data ... 17 * }; 18 * 19 * Changelog: 20 * 30-08-1997 RMK Created 21 * 14-09-1997 RMK Started disconnect support 22 * 08-02-1998 RMK Corrected real DMA support 23 * 15-02-1998 RMK Started sync xfer support 24 * 06-04-1998 RMK Tightened conditions for printing incomplete 25 * transfers 26 * 02-05-1998 RMK Added extra checks in fas216_reset 27 * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns 28 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h 29 * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT 30 * 02-04-2000 RMK Converted to use the new error handling, and 31 * automatically request sense data upon check 32 * condition status from targets. 33 */ 34 #include <linux/module.h> 35 #include <linux/blkdev.h> 36 #include <linux/kernel.h> 37 #include <linux/string.h> 38 #include <linux/ioport.h> 39 #include <linux/proc_fs.h> 40 #include <linux/delay.h> 41 #include <linux/bitops.h> 42 #include <linux/init.h> 43 #include <linux/interrupt.h> 44 45 #include <asm/dma.h> 46 #include <asm/io.h> 47 #include <asm/irq.h> 48 #include <asm/ecard.h> 49 50 #include <scsi/scsi.h> 51 #include <scsi/scsi_cmnd.h> 52 #include <scsi/scsi_dbg.h> 53 #include <scsi/scsi_device.h> 54 #include <scsi/scsi_eh.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_tcq.h> 57 #include "fas216.h" 58 #include "arm_scsi.h" 59 60 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to 61 * the data sheet. This restriction is crazy, especially when 62 * you only want to send 16 bytes! What were the guys who 63 * designed this chip on at that time? Did they read the SCSI2 64 * spec at all? The following sections are taken from the SCSI2 65 * standard (s2r10) concerning this: 66 * 67 * > IMPLEMENTORS NOTES: 68 * > (1) Re-negotiation at every selection is not recommended, since a 69 * > significant performance impact is likely. 70 * 71 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE 72 * > RESET message is received, until a hard reset condition occurs, or until one 73 * > of the two SCSI devices elects to modify the agreement. The default data 74 * > transfer mode is asynchronous data transfer mode. The default data transfer 75 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard 76 * > reset condition. 77 * 78 * In total, this means that once you have elected to use synchronous 79 * transfers, you must always use DMA. 80 * 81 * I was thinking that this was a good chip until I found this restriction ;( 82 */ 83 #define SCSI2_SYNC 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 fas216_log_setup(char * str)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 fas216_readb(FAS216_Info * info,unsigned int reg)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 fas216_writeb(FAS216_Info * info,unsigned int reg,unsigned int val)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 fas216_dumpstate(FAS216_Info * info)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 print_SCp(struct scsi_pointer * SCp,const char * prefix,const char * suffix)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 fas216_dumpinfo(FAS216_Info * info)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 __fas216_checkmagic(FAS216_Info * info,const char * func)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 fas216_bus_phase(int stat)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 fas216_drv_phase(FAS216_Info * info)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 fas216_target(FAS216_Info * info)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 fas216_do_log(FAS216_Info * info,char target,char * fmt,va_list ap)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 fas216_log_command(FAS216_Info * info,int level,struct scsi_cmnd * SCpnt,char * fmt,...)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 fas216_log_target(FAS216_Info * info,int level,int target,char * fmt,...)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 fas216_log(FAS216_Info * info,int level,char * fmt,...)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 add_debug_list(int stat,int ssr,int isr,int ph)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 fas216_cmd(FAS216_Info * info,unsigned int command)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 print_debug_list(void)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 fas216_get_last_msg(FAS216_Info * info,int pos)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 */ fas216_syncperiod(FAS216_Info * info,int ns)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 */ fas216_set_sync(FAS216_Info * info,int target)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 */ fas216_handlesync(FAS216_Info * info,char * msg)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 fallthrough; 610 611 case async: 612 dev->period = info->ifcfg.asyncperiod / 4; 613 dev->sof = 0; 614 dev->stp = info->scsi.async_stp; 615 fas216_set_sync(info, info->SCpnt->device->id); 616 break; 617 618 case none: 619 break; 620 } 621 } 622 623 /** 624 * fas216_updateptrs - update data pointers after transfer suspended/paused 625 * @info: interface's local pointer to update 626 * @bytes_transferred: number of bytes transferred 627 * 628 * Update data pointers after transfer suspended/paused 629 */ fas216_updateptrs(FAS216_Info * info,int bytes_transferred)630 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred) 631 { 632 struct scsi_pointer *SCp = &info->scsi.SCp; 633 634 fas216_checkmagic(info); 635 636 BUG_ON(bytes_transferred < 0); 637 638 SCp->phase -= bytes_transferred; 639 640 while (bytes_transferred != 0) { 641 if (SCp->this_residual > bytes_transferred) 642 break; 643 /* 644 * We have used up this buffer. Move on to the 645 * next buffer. 646 */ 647 bytes_transferred -= SCp->this_residual; 648 if (!next_SCp(SCp) && bytes_transferred) { 649 printk(KERN_WARNING "scsi%d.%c: out of buffers\n", 650 info->host->host_no, '0' + info->SCpnt->device->id); 651 return; 652 } 653 } 654 655 SCp->this_residual -= bytes_transferred; 656 if (SCp->this_residual) 657 SCp->ptr += bytes_transferred; 658 else 659 SCp->ptr = NULL; 660 } 661 662 /** 663 * fas216_pio - transfer data off of/on to card using programmed IO 664 * @info: interface to transfer data to/from 665 * @direction: direction to transfer data (DMA_OUT/DMA_IN) 666 * 667 * Transfer data off of/on to card using programmed IO. 668 * Notes: this is incredibly slow. 669 */ fas216_pio(FAS216_Info * info,fasdmadir_t direction)670 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction) 671 { 672 struct scsi_pointer *SCp = &info->scsi.SCp; 673 674 fas216_checkmagic(info); 675 676 if (direction == DMA_OUT) 677 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp)); 678 else 679 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF)); 680 681 if (SCp->this_residual == 0) 682 next_SCp(SCp); 683 } 684 fas216_set_stc(FAS216_Info * info,unsigned int length)685 static void fas216_set_stc(FAS216_Info *info, unsigned int length) 686 { 687 fas216_writeb(info, REG_STCL, length); 688 fas216_writeb(info, REG_STCM, length >> 8); 689 fas216_writeb(info, REG_STCH, length >> 16); 690 } 691 fas216_get_ctc(FAS216_Info * info)692 static unsigned int fas216_get_ctc(FAS216_Info *info) 693 { 694 return fas216_readb(info, REG_CTCL) + 695 (fas216_readb(info, REG_CTCM) << 8) + 696 (fas216_readb(info, REG_CTCH) << 16); 697 } 698 699 /** 700 * fas216_cleanuptransfer - clean up after a transfer has completed. 701 * @info: interface to clean up 702 * 703 * Update the data pointers according to the number of bytes transferred 704 * on the SCSI bus. 705 */ fas216_cleanuptransfer(FAS216_Info * info)706 static void fas216_cleanuptransfer(FAS216_Info *info) 707 { 708 unsigned long total, residual, fifo; 709 fasdmatype_t dmatype = info->dma.transfer_type; 710 711 info->dma.transfer_type = fasdma_none; 712 713 /* 714 * PIO transfers do not need to be cleaned up. 715 */ 716 if (dmatype == fasdma_pio || dmatype == fasdma_none) 717 return; 718 719 if (dmatype == fasdma_real_all) 720 total = info->scsi.SCp.phase; 721 else 722 total = info->scsi.SCp.this_residual; 723 724 residual = fas216_get_ctc(info); 725 726 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 727 728 fas216_log(info, LOG_BUFFER, "cleaning up from previous " 729 "transfer: length 0x%06x, residual 0x%x, fifo %d", 730 total, residual, fifo); 731 732 /* 733 * If we were performing Data-Out, the transfer counter 734 * counts down each time a byte is transferred by the 735 * host to the FIFO. This means we must include the 736 * bytes left in the FIFO from the transfer counter. 737 */ 738 if (info->scsi.phase == PHASE_DATAOUT) 739 residual += fifo; 740 741 fas216_updateptrs(info, total - residual); 742 } 743 744 /** 745 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card 746 * @info: interface from which device disconnected from 747 * 748 * Start a DMA/PIO transfer off of/on to card 749 */ fas216_transfer(FAS216_Info * info)750 static void fas216_transfer(FAS216_Info *info) 751 { 752 fasdmadir_t direction; 753 fasdmatype_t dmatype; 754 755 fas216_log(info, LOG_BUFFER, 756 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x", 757 info->scsi.SCp.ptr, info->scsi.SCp.this_residual, 758 info->scsi.SCp.phase); 759 760 if (!info->scsi.SCp.ptr) { 761 fas216_log(info, LOG_ERROR, "null buffer passed to " 762 "fas216_starttransfer"); 763 print_SCp(&info->scsi.SCp, "SCp: ", "\n"); 764 print_SCp(arm_scsi_pointer(info->SCpnt), "Cmnd SCp: ", "\n"); 765 return; 766 } 767 768 /* 769 * If we have a synchronous transfer agreement in effect, we must 770 * use DMA mode. If we are using asynchronous transfers, we may 771 * use DMA mode or PIO mode. 772 */ 773 if (info->device[info->SCpnt->device->id].sof) 774 dmatype = fasdma_real_all; 775 else 776 dmatype = fasdma_pio; 777 778 if (info->scsi.phase == PHASE_DATAOUT) 779 direction = DMA_OUT; 780 else 781 direction = DMA_IN; 782 783 if (info->dma.setup) 784 dmatype = info->dma.setup(info->host, &info->scsi.SCp, 785 direction, dmatype); 786 info->dma.transfer_type = dmatype; 787 788 if (dmatype == fasdma_real_all) 789 fas216_set_stc(info, info->scsi.SCp.phase); 790 else 791 fas216_set_stc(info, info->scsi.SCp.this_residual); 792 793 switch (dmatype) { 794 case fasdma_pio: 795 fas216_log(info, LOG_BUFFER, "PIO transfer"); 796 fas216_writeb(info, REG_SOF, 0); 797 fas216_writeb(info, REG_STP, info->scsi.async_stp); 798 fas216_cmd(info, CMD_TRANSFERINFO); 799 fas216_pio(info, direction); 800 break; 801 802 case fasdma_pseudo: 803 fas216_log(info, LOG_BUFFER, "pseudo transfer"); 804 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 805 info->dma.pseudo(info->host, &info->scsi.SCp, 806 direction, info->SCpnt->transfersize); 807 break; 808 809 case fasdma_real_block: 810 fas216_log(info, LOG_BUFFER, "block dma transfer"); 811 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 812 break; 813 814 case fasdma_real_all: 815 fas216_log(info, LOG_BUFFER, "total dma transfer"); 816 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 817 break; 818 819 default: 820 fas216_log(info, LOG_BUFFER | LOG_ERROR, 821 "invalid FAS216 DMA type"); 822 break; 823 } 824 } 825 826 /** 827 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card 828 * @info: interface from which device disconnected from 829 * 830 * Called when we switch away from DATA IN or DATA OUT phases. 831 */ fas216_stoptransfer(FAS216_Info * info)832 static void fas216_stoptransfer(FAS216_Info *info) 833 { 834 fas216_checkmagic(info); 835 836 if (info->dma.transfer_type == fasdma_real_all || 837 info->dma.transfer_type == fasdma_real_block) 838 info->dma.stop(info->host, &info->scsi.SCp); 839 840 fas216_cleanuptransfer(info); 841 842 if (info->scsi.phase == PHASE_DATAIN) { 843 unsigned int fifo; 844 845 /* 846 * If we were performing Data-In, then the FIFO counter 847 * contains the number of bytes not transferred via DMA 848 * from the on-board FIFO. Read them manually. 849 */ 850 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 851 while (fifo && info->scsi.SCp.ptr) { 852 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF); 853 fas216_updateptrs(info, 1); 854 fifo--; 855 } 856 } else { 857 /* 858 * After a Data-Out phase, there may be unsent 859 * bytes left in the FIFO. Flush them out. 860 */ 861 fas216_cmd(info, CMD_FLUSHFIFO); 862 } 863 } 864 fas216_aborttransfer(FAS216_Info * info)865 static void fas216_aborttransfer(FAS216_Info *info) 866 { 867 fas216_checkmagic(info); 868 869 if (info->dma.transfer_type == fasdma_real_all || 870 info->dma.transfer_type == fasdma_real_block) 871 info->dma.stop(info->host, &info->scsi.SCp); 872 873 info->dma.transfer_type = fasdma_none; 874 fas216_cmd(info, CMD_FLUSHFIFO); 875 } 876 877 static void fas216_kick(FAS216_Info *info); 878 879 /** 880 * fas216_disconnected_intr - handle device disconnection 881 * @info: interface from which device disconnected from 882 * 883 * Handle device disconnection 884 */ fas216_disconnect_intr(FAS216_Info * info)885 static void fas216_disconnect_intr(FAS216_Info *info) 886 { 887 unsigned long flags; 888 889 fas216_checkmagic(info); 890 891 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x", 892 info->scsi.phase); 893 894 msgqueue_flush(&info->scsi.msgs); 895 896 switch (info->scsi.phase) { 897 case PHASE_SELECTION: /* while selecting - no target */ 898 case PHASE_SELSTEPS: 899 fas216_done(info, DID_NO_CONNECT); 900 break; 901 902 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */ 903 info->scsi.disconnectable = 1; 904 info->scsi.phase = PHASE_IDLE; 905 info->stats.disconnects += 1; 906 spin_lock_irqsave(&info->host_lock, flags); 907 if (info->scsi.phase == PHASE_IDLE) 908 fas216_kick(info); 909 spin_unlock_irqrestore(&info->host_lock, flags); 910 break; 911 912 case PHASE_DONE: /* at end of command - complete */ 913 fas216_done(info, DID_OK); 914 break; 915 916 case PHASE_MSGOUT: /* message out - possible ABORT message */ 917 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) { 918 info->scsi.aborting = 0; 919 fas216_done(info, DID_ABORT); 920 break; 921 } 922 fallthrough; 923 924 default: /* huh? */ 925 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n", 926 info->host->host_no, fas216_target(info), fas216_drv_phase(info)); 927 print_debug_list(); 928 fas216_stoptransfer(info); 929 fas216_done(info, DID_ERROR); 930 break; 931 } 932 } 933 934 /** 935 * fas216_reselected_intr - start reconnection of a device 936 * @info: interface which was reselected 937 * 938 * Start reconnection of a device 939 */ 940 static void fas216_reselected_intr(FAS216_Info * info)941 fas216_reselected_intr(FAS216_Info *info) 942 { 943 unsigned int cfis, i; 944 unsigned char msg[4]; 945 unsigned char target, lun, tag; 946 947 fas216_checkmagic(info); 948 949 WARN_ON(info->scsi.phase == PHASE_SELECTION || 950 info->scsi.phase == PHASE_SELSTEPS); 951 952 cfis = fas216_readb(info, REG_CFIS); 953 954 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x", 955 info->scsi.phase, cfis); 956 957 cfis &= CFIS_CF; 958 959 if (cfis < 2 || cfis > 4) { 960 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n", 961 info->host->host_no); 962 goto bad_message; 963 } 964 965 for (i = 0; i < cfis; i++) 966 msg[i] = fas216_readb(info, REG_FF); 967 968 if (!(msg[0] & (1 << info->host->this_id)) || 969 !(msg[1] & 0x80)) 970 goto initiator_error; 971 972 target = msg[0] & ~(1 << info->host->this_id); 973 target = ffs(target) - 1; 974 lun = msg[1] & 7; 975 tag = 0; 976 977 if (cfis >= 3) { 978 if (msg[2] != SIMPLE_QUEUE_TAG) 979 goto initiator_error; 980 981 tag = msg[3]; 982 } 983 984 /* set up for synchronous transfers */ 985 fas216_writeb(info, REG_SDID, target); 986 fas216_set_sync(info, target); 987 msgqueue_flush(&info->scsi.msgs); 988 989 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x", 990 target, lun, tag); 991 992 if (info->scsi.disconnectable && info->SCpnt) { 993 info->scsi.disconnectable = 0; 994 if (info->SCpnt->device->id == target && 995 info->SCpnt->device->lun == lun && 996 scsi_cmd_to_rq(info->SCpnt)->tag == tag) { 997 fas216_log(info, LOG_CONNECT, "reconnected previously executing command"); 998 } else { 999 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 1000 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue"); 1001 info->SCpnt = NULL; 1002 } 1003 } 1004 if (!info->SCpnt) { 1005 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected, 1006 target, lun, tag); 1007 fas216_log(info, LOG_CONNECT, "had to get command"); 1008 } 1009 1010 if (info->SCpnt) { 1011 /* 1012 * Restore data pointer from SAVED data pointer 1013 */ 1014 info->scsi.SCp = *arm_scsi_pointer(info->SCpnt); 1015 1016 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]", 1017 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1018 info->scsi.phase = PHASE_MSGIN; 1019 } else { 1020 /* 1021 * Our command structure not found - abort the 1022 * command on the target. Since we have no 1023 * record of this command, we can't send 1024 * an INITIATOR DETECTED ERROR message. 1025 */ 1026 fas216_cmd(info, CMD_SETATN); 1027 1028 #if 0 1029 if (tag) 1030 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag); 1031 else 1032 #endif 1033 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT); 1034 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1035 info->scsi.aborting = 1; 1036 } 1037 1038 fas216_cmd(info, CMD_MSGACCEPTED); 1039 return; 1040 1041 initiator_error: 1042 printk(KERN_ERR "scsi%d.H: error during reselection: bytes", 1043 info->host->host_no); 1044 for (i = 0; i < cfis; i++) 1045 printk(" %02x", msg[i]); 1046 printk("\n"); 1047 bad_message: 1048 fas216_cmd(info, CMD_SETATN); 1049 msgqueue_flush(&info->scsi.msgs); 1050 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1051 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1052 fas216_cmd(info, CMD_MSGACCEPTED); 1053 } 1054 fas216_parse_message(FAS216_Info * info,unsigned char * message,int msglen)1055 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen) 1056 { 1057 struct scsi_pointer *scsi_pointer; 1058 int i; 1059 1060 switch (message[0]) { 1061 case COMMAND_COMPLETE: 1062 if (msglen != 1) 1063 goto unrecognised; 1064 1065 printk(KERN_ERR "scsi%d.%c: command complete with no " 1066 "status in MESSAGE_IN?\n", 1067 info->host->host_no, fas216_target(info)); 1068 break; 1069 1070 case SAVE_POINTERS: 1071 if (msglen != 1) 1072 goto unrecognised; 1073 1074 /* 1075 * Save current data pointer to SAVED data pointer 1076 * SCSI II standard says that we must not acknowledge 1077 * this until we have really saved pointers. 1078 * NOTE: we DO NOT save the command nor status pointers 1079 * as required by the SCSI II standard. These always 1080 * point to the start of their respective areas. 1081 */ 1082 scsi_pointer = arm_scsi_pointer(info->SCpnt); 1083 *scsi_pointer = info->scsi.SCp; 1084 scsi_pointer->sent_command = 0; 1085 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1086 "save data pointers: [%p, %X]", 1087 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1088 break; 1089 1090 case RESTORE_POINTERS: 1091 if (msglen != 1) 1092 goto unrecognised; 1093 1094 /* 1095 * Restore current data pointer from SAVED data pointer 1096 */ 1097 info->scsi.SCp = *arm_scsi_pointer(info->SCpnt); 1098 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1099 "restore data pointers: [%p, 0x%x]", 1100 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1101 break; 1102 1103 case DISCONNECT: 1104 if (msglen != 1) 1105 goto unrecognised; 1106 1107 info->scsi.phase = PHASE_MSGIN_DISCONNECT; 1108 break; 1109 1110 case MESSAGE_REJECT: 1111 if (msglen != 1) 1112 goto unrecognised; 1113 1114 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) { 1115 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8: 1116 fas216_handlesync(info, message); 1117 break; 1118 1119 default: 1120 fas216_log(info, 0, "reject, last message 0x%04x", 1121 fas216_get_last_msg(info, info->scsi.msgin_fifo)); 1122 } 1123 break; 1124 1125 case NOP: 1126 break; 1127 1128 case EXTENDED_MESSAGE: 1129 if (msglen < 3) 1130 goto unrecognised; 1131 1132 switch (message[2]) { 1133 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */ 1134 fas216_handlesync(info, message); 1135 break; 1136 1137 default: 1138 goto unrecognised; 1139 } 1140 break; 1141 1142 default: 1143 goto unrecognised; 1144 } 1145 return; 1146 1147 unrecognised: 1148 fas216_log(info, 0, "unrecognised message, rejecting"); 1149 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info)); 1150 for (i = 0; i < msglen; i++) 1151 printk("%s%02X", i & 31 ? " " : "\n ", message[i]); 1152 printk("\n"); 1153 1154 /* 1155 * Something strange seems to be happening here - 1156 * I can't use SETATN since the chip gives me an 1157 * invalid command interrupt when I do. Weird. 1158 */ 1159 fas216_cmd(info, CMD_NOP); 1160 fas216_dumpstate(info); 1161 fas216_cmd(info, CMD_SETATN); 1162 msgqueue_flush(&info->scsi.msgs); 1163 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 1164 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1165 fas216_dumpstate(info); 1166 } 1167 fas216_wait_cmd(FAS216_Info * info,int cmd)1168 static int fas216_wait_cmd(FAS216_Info *info, int cmd) 1169 { 1170 int tout; 1171 int stat; 1172 1173 fas216_cmd(info, cmd); 1174 1175 for (tout = 1000; tout; tout -= 1) { 1176 stat = fas216_readb(info, REG_STAT); 1177 if (stat & (STAT_INT|STAT_PARITYERROR)) 1178 break; 1179 udelay(1); 1180 } 1181 1182 return stat; 1183 } 1184 fas216_get_msg_byte(FAS216_Info * info)1185 static int fas216_get_msg_byte(FAS216_Info *info) 1186 { 1187 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED); 1188 1189 if ((stat & STAT_INT) == 0) 1190 goto timedout; 1191 1192 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1193 goto unexpected_phase_change; 1194 1195 fas216_readb(info, REG_INST); 1196 1197 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO); 1198 1199 if ((stat & STAT_INT) == 0) 1200 goto timedout; 1201 1202 if (stat & STAT_PARITYERROR) 1203 goto parity_error; 1204 1205 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1206 goto unexpected_phase_change; 1207 1208 fas216_readb(info, REG_INST); 1209 1210 return fas216_readb(info, REG_FF); 1211 1212 timedout: 1213 fas216_log(info, LOG_ERROR, "timed out waiting for message byte"); 1214 return -1; 1215 1216 unexpected_phase_change: 1217 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat); 1218 return -2; 1219 1220 parity_error: 1221 fas216_log(info, LOG_ERROR, "parity error during message in phase"); 1222 return -3; 1223 } 1224 1225 /** 1226 * fas216_message - handle a function done interrupt from FAS216 chip 1227 * @info: interface which caused function done interrupt 1228 * 1229 * Handle a function done interrupt from FAS216 chip 1230 */ fas216_message(FAS216_Info * info)1231 static void fas216_message(FAS216_Info *info) 1232 { 1233 unsigned char *message = info->scsi.message; 1234 unsigned int msglen = 1; 1235 int msgbyte = 0; 1236 1237 fas216_checkmagic(info); 1238 1239 message[0] = fas216_readb(info, REG_FF); 1240 1241 if (message[0] == EXTENDED_MESSAGE) { 1242 msgbyte = fas216_get_msg_byte(info); 1243 1244 if (msgbyte >= 0) { 1245 message[1] = msgbyte; 1246 1247 for (msglen = 2; msglen < message[1] + 2; msglen++) { 1248 msgbyte = fas216_get_msg_byte(info); 1249 1250 if (msgbyte >= 0) 1251 message[msglen] = msgbyte; 1252 else 1253 break; 1254 } 1255 } 1256 } 1257 1258 if (msgbyte == -3) 1259 goto parity_error; 1260 1261 #ifdef DEBUG_MESSAGES 1262 { 1263 int i; 1264 1265 printk("scsi%d.%c: message in: ", 1266 info->host->host_no, fas216_target(info)); 1267 for (i = 0; i < msglen; i++) 1268 printk("%02X ", message[i]); 1269 printk("\n"); 1270 } 1271 #endif 1272 1273 fas216_parse_message(info, message, msglen); 1274 fas216_cmd(info, CMD_MSGACCEPTED); 1275 return; 1276 1277 parity_error: 1278 fas216_cmd(info, CMD_SETATN); 1279 msgqueue_flush(&info->scsi.msgs); 1280 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR); 1281 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1282 fas216_cmd(info, CMD_MSGACCEPTED); 1283 return; 1284 } 1285 1286 /** 1287 * fas216_send_command - send command after all message bytes have been sent 1288 * @info: interface which caused bus service 1289 * 1290 * Send a command to a target after all message bytes have been sent 1291 */ fas216_send_command(FAS216_Info * info)1292 static void fas216_send_command(FAS216_Info *info) 1293 { 1294 int i; 1295 1296 fas216_checkmagic(info); 1297 1298 fas216_cmd(info, CMD_NOP|CMD_WITHDMA); 1299 fas216_cmd(info, CMD_FLUSHFIFO); 1300 1301 /* load command */ 1302 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++) 1303 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]); 1304 1305 fas216_cmd(info, CMD_TRANSFERINFO); 1306 1307 info->scsi.phase = PHASE_COMMAND; 1308 } 1309 1310 /** 1311 * fas216_send_messageout - handle bus service to send a message 1312 * @info: interface which caused bus service 1313 * 1314 * Handle bus service to send a message. 1315 * Note: We do not allow the device to change the data direction! 1316 */ fas216_send_messageout(FAS216_Info * info,int start)1317 static void fas216_send_messageout(FAS216_Info *info, int start) 1318 { 1319 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1320 1321 fas216_checkmagic(info); 1322 1323 fas216_cmd(info, CMD_FLUSHFIFO); 1324 1325 if (tot_msglen) { 1326 struct message *msg; 1327 int msgnr = 0; 1328 1329 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1330 int i; 1331 1332 for (i = start; i < msg->length; i++) 1333 fas216_writeb(info, REG_FF, msg->msg[i]); 1334 1335 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1336 start = 0; 1337 } 1338 } else 1339 fas216_writeb(info, REG_FF, NOP); 1340 1341 fas216_cmd(info, CMD_TRANSFERINFO); 1342 1343 info->scsi.phase = PHASE_MSGOUT; 1344 } 1345 1346 /** 1347 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip 1348 * @info: interface which caused bus service interrupt 1349 * @stat: Status register contents 1350 * @is: SCSI Status register contents 1351 * 1352 * Handle a bus service interrupt from FAS216 chip 1353 */ fas216_busservice_intr(FAS216_Info * info,unsigned int stat,unsigned int is)1354 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1355 { 1356 fas216_checkmagic(info); 1357 1358 fas216_log(info, LOG_BUSSERVICE, 1359 "bus service: stat=%02x is=%02x phase=%02x", 1360 stat, is, info->scsi.phase); 1361 1362 switch (info->scsi.phase) { 1363 case PHASE_SELECTION: 1364 if ((is & IS_BITS) != IS_MSGBYTESENT) 1365 goto bad_is; 1366 break; 1367 1368 case PHASE_SELSTEPS: 1369 switch (is & IS_BITS) { 1370 case IS_SELARB: 1371 case IS_MSGBYTESENT: 1372 goto bad_is; 1373 1374 case IS_NOTCOMMAND: 1375 case IS_EARLYPHASE: 1376 if ((stat & STAT_BUSMASK) == STAT_MESGIN) 1377 break; 1378 goto bad_is; 1379 1380 case IS_COMPLETE: 1381 break; 1382 } 1383 break; 1384 1385 default: 1386 break; 1387 } 1388 1389 fas216_cmd(info, CMD_NOP); 1390 1391 #define STATE(st,ph) ((ph) << 3 | (st)) 1392 /* This table describes the legal SCSI state transitions, 1393 * as described by the SCSI II spec. 1394 */ 1395 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) { 1396 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */ 1397 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */ 1398 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */ 1399 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */ 1400 info->scsi.phase = PHASE_DATAIN; 1401 fas216_transfer(info); 1402 return; 1403 1404 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */ 1405 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */ 1406 fas216_cleanuptransfer(info); 1407 fas216_transfer(info); 1408 return; 1409 1410 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */ 1411 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */ 1412 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */ 1413 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */ 1414 fas216_cmd(info, CMD_FLUSHFIFO); 1415 info->scsi.phase = PHASE_DATAOUT; 1416 fas216_transfer(info); 1417 return; 1418 1419 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */ 1420 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */ 1421 fas216_stoptransfer(info); 1422 fallthrough; 1423 1424 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */ 1425 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */ 1426 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */ 1427 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */ 1428 fas216_cmd(info, CMD_INITCMDCOMPLETE); 1429 info->scsi.phase = PHASE_STATUS; 1430 return; 1431 1432 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */ 1433 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */ 1434 fas216_stoptransfer(info); 1435 fallthrough; 1436 1437 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */ 1438 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */ 1439 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */ 1440 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1441 fas216_cmd(info, CMD_FLUSHFIFO); 1442 fas216_cmd(info, CMD_TRANSFERINFO); 1443 info->scsi.phase = PHASE_MSGIN; 1444 return; 1445 1446 case STATE(STAT_MESGIN, PHASE_MSGIN): 1447 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1448 fas216_cmd(info, CMD_TRANSFERINFO); 1449 return; 1450 1451 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */ 1452 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */ 1453 fas216_send_command(info); 1454 info->scsi.phase = PHASE_COMMAND; 1455 return; 1456 1457 1458 /* 1459 * Selection -> Message Out 1460 */ 1461 case STATE(STAT_MESGOUT, PHASE_SELECTION): 1462 fas216_send_messageout(info, 1); 1463 return; 1464 1465 /* 1466 * Message Out -> Message Out 1467 */ 1468 case STATE(STAT_MESGOUT, PHASE_SELSTEPS): 1469 case STATE(STAT_MESGOUT, PHASE_MSGOUT): 1470 /* 1471 * If we get another message out phase, this usually 1472 * means some parity error occurred. Resend complete 1473 * set of messages. If we have more than one byte to 1474 * send, we need to assert ATN again. 1475 */ 1476 if (info->device[info->SCpnt->device->id].parity_check) { 1477 /* 1478 * We were testing... good, the device 1479 * supports parity checking. 1480 */ 1481 info->device[info->SCpnt->device->id].parity_check = 0; 1482 info->device[info->SCpnt->device->id].parity_enabled = 1; 1483 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1484 } 1485 1486 if (msgqueue_msglength(&info->scsi.msgs) > 1) 1487 fas216_cmd(info, CMD_SETATN); 1488 fallthrough; 1489 1490 /* 1491 * Any -> Message Out 1492 */ 1493 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT): 1494 fas216_send_messageout(info, 0); 1495 return; 1496 1497 /* Error recovery rules. 1498 * These either attempt to abort or retry the operation. 1499 * TODO: we need more of these 1500 */ 1501 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */ 1502 /* error - we've sent out all the command bytes 1503 * we have. 1504 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS 1505 * to include the command bytes sent for this to work 1506 * correctly. 1507 */ 1508 printk(KERN_ERR "scsi%d.%c: " 1509 "target trying to receive more command bytes\n", 1510 info->host->host_no, fas216_target(info)); 1511 fas216_cmd(info, CMD_SETATN); 1512 fas216_set_stc(info, 15); 1513 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA); 1514 msgqueue_flush(&info->scsi.msgs); 1515 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1516 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1517 return; 1518 } 1519 1520 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) { 1521 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n", 1522 info->host->host_no, fas216_target(info), 1523 fas216_bus_phase(stat)); 1524 msgqueue_flush(&info->scsi.msgs); 1525 fas216_cmd(info, CMD_SETATN); 1526 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1527 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1528 info->scsi.aborting = 1; 1529 fas216_cmd(info, CMD_TRANSFERINFO); 1530 return; 1531 } 1532 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n", 1533 info->host->host_no, fas216_target(info), 1534 fas216_bus_phase(stat), 1535 fas216_drv_phase(info)); 1536 print_debug_list(); 1537 return; 1538 1539 bad_is: 1540 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS); 1541 fas216_dumpstate(info); 1542 print_debug_list(); 1543 1544 fas216_done(info, DID_ERROR); 1545 } 1546 1547 /** 1548 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip 1549 * @info: interface which caused function done interrupt 1550 * @stat: Status register contents 1551 * @is: SCSI Status register contents 1552 * 1553 * Handle a function done interrupt from FAS216 chip 1554 */ fas216_funcdone_intr(FAS216_Info * info,unsigned int stat,unsigned int is)1555 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1556 { 1557 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF; 1558 1559 fas216_checkmagic(info); 1560 1561 fas216_log(info, LOG_FUNCTIONDONE, 1562 "function done: stat=%02x is=%02x phase=%02x", 1563 stat, is, info->scsi.phase); 1564 1565 switch (info->scsi.phase) { 1566 case PHASE_STATUS: /* status phase - read status and msg */ 1567 if (fifo_len != 2) { 1568 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len); 1569 } 1570 /* 1571 * Read status then message byte. 1572 */ 1573 info->scsi.SCp.Status = fas216_readb(info, REG_FF); 1574 info->scsi.SCp.Message = fas216_readb(info, REG_FF); 1575 info->scsi.phase = PHASE_DONE; 1576 fas216_cmd(info, CMD_MSGACCEPTED); 1577 break; 1578 1579 case PHASE_IDLE: 1580 case PHASE_SELECTION: 1581 case PHASE_SELSTEPS: 1582 break; 1583 1584 case PHASE_MSGIN: /* message in phase */ 1585 if ((stat & STAT_BUSMASK) == STAT_MESGIN) { 1586 info->scsi.msgin_fifo = fifo_len; 1587 fas216_message(info); 1588 break; 1589 } 1590 fallthrough; 1591 1592 default: 1593 fas216_log(info, 0, "internal phase %s for function done?" 1594 " What do I do with this?", 1595 fas216_target(info), fas216_drv_phase(info)); 1596 } 1597 } 1598 fas216_bus_reset(FAS216_Info * info)1599 static void fas216_bus_reset(FAS216_Info *info) 1600 { 1601 neg_t sync_state; 1602 int i; 1603 1604 msgqueue_flush(&info->scsi.msgs); 1605 1606 sync_state = neg_invalid; 1607 1608 #ifdef SCSI2_SYNC 1609 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA)) 1610 sync_state = neg_wait; 1611 #endif 1612 1613 info->scsi.phase = PHASE_IDLE; 1614 info->SCpnt = NULL; /* bug! */ 1615 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp)); 1616 1617 for (i = 0; i < 8; i++) { 1618 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok; 1619 info->device[i].sync_state = sync_state; 1620 info->device[i].period = info->ifcfg.asyncperiod / 4; 1621 info->device[i].stp = info->scsi.async_stp; 1622 info->device[i].sof = 0; 1623 info->device[i].wide_xfer = 0; 1624 } 1625 1626 info->rst_bus_status = 1; 1627 wake_up(&info->eh_wait); 1628 } 1629 1630 /** 1631 * fas216_intr - handle interrupts to progress a command 1632 * @info: interface to service 1633 * 1634 * Handle interrupts from the interface to progress a command 1635 */ fas216_intr(FAS216_Info * info)1636 irqreturn_t fas216_intr(FAS216_Info *info) 1637 { 1638 unsigned char inst, is, stat; 1639 int handled = IRQ_NONE; 1640 1641 fas216_checkmagic(info); 1642 1643 stat = fas216_readb(info, REG_STAT); 1644 is = fas216_readb(info, REG_IS); 1645 inst = fas216_readb(info, REG_INST); 1646 1647 add_debug_list(stat, is, inst, info->scsi.phase); 1648 1649 if (stat & STAT_INT) { 1650 if (inst & INST_BUSRESET) { 1651 fas216_log(info, 0, "bus reset detected"); 1652 fas216_bus_reset(info); 1653 scsi_report_bus_reset(info->host, 0); 1654 } else if (inst & INST_ILLEGALCMD) { 1655 fas216_log(info, LOG_ERROR, "illegal command given\n"); 1656 fas216_dumpstate(info); 1657 print_debug_list(); 1658 } else if (inst & INST_DISCONNECT) 1659 fas216_disconnect_intr(info); 1660 else if (inst & INST_RESELECTED) /* reselected */ 1661 fas216_reselected_intr(info); 1662 else if (inst & INST_BUSSERVICE) /* bus service request */ 1663 fas216_busservice_intr(info, stat, is); 1664 else if (inst & INST_FUNCDONE) /* function done */ 1665 fas216_funcdone_intr(info, stat, is); 1666 else 1667 fas216_log(info, 0, "unknown interrupt received:" 1668 " phase %s inst %02X is %02X stat %02X", 1669 fas216_drv_phase(info), inst, is, stat); 1670 handled = IRQ_HANDLED; 1671 } 1672 return handled; 1673 } 1674 __fas216_start_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)1675 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1676 { 1677 int tot_msglen; 1678 1679 /* following what the ESP driver says */ 1680 fas216_set_stc(info, 0); 1681 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1682 1683 /* flush FIFO */ 1684 fas216_cmd(info, CMD_FLUSHFIFO); 1685 1686 /* load bus-id and timeout */ 1687 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1688 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1689 1690 /* synchronous transfers */ 1691 fas216_set_sync(info, SCpnt->device->id); 1692 1693 tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1694 1695 #ifdef DEBUG_MESSAGES 1696 { 1697 struct message *msg; 1698 int msgnr = 0, i; 1699 1700 printk("scsi%d.%c: message out: ", 1701 info->host->host_no, '0' + SCpnt->device->id); 1702 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1703 printk("{ "); 1704 for (i = 0; i < msg->length; i++) 1705 printk("%02x ", msg->msg[i]); 1706 printk("} "); 1707 } 1708 printk("\n"); 1709 } 1710 #endif 1711 1712 if (tot_msglen == 1 || tot_msglen == 3) { 1713 /* 1714 * We have an easy message length to send... 1715 */ 1716 struct message *msg; 1717 int msgnr = 0, i; 1718 1719 info->scsi.phase = PHASE_SELSTEPS; 1720 1721 /* load message bytes */ 1722 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1723 for (i = 0; i < msg->length; i++) 1724 fas216_writeb(info, REG_FF, msg->msg[i]); 1725 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1726 } 1727 1728 /* load command */ 1729 for (i = 0; i < SCpnt->cmd_len; i++) 1730 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]); 1731 1732 if (tot_msglen == 1) 1733 fas216_cmd(info, CMD_SELECTATN); 1734 else 1735 fas216_cmd(info, CMD_SELECTATN3); 1736 } else { 1737 /* 1738 * We have an unusual number of message bytes to send. 1739 * Load first byte into fifo, and issue SELECT with ATN and 1740 * stop steps. 1741 */ 1742 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1743 1744 fas216_writeb(info, REG_FF, msg->msg[0]); 1745 msg->fifo = 1; 1746 1747 fas216_cmd(info, CMD_SELECTATNSTOP); 1748 } 1749 } 1750 1751 /* 1752 * Decide whether we need to perform a parity test on this device. 1753 * Can also be used to force parity error conditions during initial 1754 * information transfer phase (message out) for test purposes. 1755 */ parity_test(FAS216_Info * info,int target)1756 static int parity_test(FAS216_Info *info, int target) 1757 { 1758 #if 0 1759 if (target == 3) { 1760 info->device[target].parity_check = 0; 1761 return 1; 1762 } 1763 #endif 1764 return info->device[target].parity_check; 1765 } 1766 fas216_start_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)1767 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1768 { 1769 int disconnect_ok; 1770 1771 /* 1772 * claim host busy 1773 */ 1774 info->scsi.phase = PHASE_SELECTION; 1775 info->scsi.SCp = *arm_scsi_pointer(SCpnt); 1776 info->SCpnt = SCpnt; 1777 info->dma.transfer_type = fasdma_none; 1778 1779 if (parity_test(info, SCpnt->device->id)) 1780 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE); 1781 else 1782 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1783 1784 /* 1785 * Don't allow request sense commands to disconnect. 1786 */ 1787 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE && 1788 info->device[SCpnt->device->id].disconnect_ok; 1789 1790 /* 1791 * build outgoing message bytes 1792 */ 1793 msgqueue_flush(&info->scsi.msgs); 1794 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun)); 1795 1796 /* 1797 * add tag message if required 1798 */ 1799 if (SCpnt->device->simple_tags) 1800 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, 1801 scsi_cmd_to_rq(SCpnt)->tag); 1802 1803 do { 1804 #ifdef SCSI2_SYNC 1805 if ((info->device[SCpnt->device->id].sync_state == neg_wait || 1806 info->device[SCpnt->device->id].sync_state == neg_complete) && 1807 (SCpnt->cmnd[0] == REQUEST_SENSE || 1808 SCpnt->cmnd[0] == INQUIRY)) { 1809 info->device[SCpnt->device->id].sync_state = neg_inprogress; 1810 msgqueue_addmsg(&info->scsi.msgs, 5, 1811 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1812 1000 / info->ifcfg.clockrate, 1813 info->ifcfg.sync_max_depth); 1814 break; 1815 } 1816 #endif 1817 } while (0); 1818 1819 __fas216_start_command(info, SCpnt); 1820 } 1821 fas216_allocate_tag(FAS216_Info * info,struct scsi_cmnd * SCpnt)1822 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1823 { 1824 set_bit(SCpnt->device->id * 8 + 1825 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 1826 1827 info->stats.removes += 1; 1828 switch (SCpnt->cmnd[0]) { 1829 case WRITE_6: 1830 case WRITE_10: 1831 case WRITE_12: 1832 info->stats.writes += 1; 1833 break; 1834 case READ_6: 1835 case READ_10: 1836 case READ_12: 1837 info->stats.reads += 1; 1838 break; 1839 default: 1840 info->stats.miscs += 1; 1841 break; 1842 } 1843 } 1844 fas216_do_bus_device_reset(FAS216_Info * info,struct scsi_cmnd * SCpnt)1845 static void fas216_do_bus_device_reset(FAS216_Info *info, 1846 struct scsi_cmnd *SCpnt) 1847 { 1848 struct message *msg; 1849 1850 /* 1851 * claim host busy 1852 */ 1853 info->scsi.phase = PHASE_SELECTION; 1854 info->scsi.SCp = *arm_scsi_pointer(SCpnt); 1855 info->SCpnt = SCpnt; 1856 info->dma.transfer_type = fasdma_none; 1857 1858 fas216_log(info, LOG_ERROR, "sending bus device reset"); 1859 1860 msgqueue_flush(&info->scsi.msgs); 1861 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET); 1862 1863 /* following what the ESP driver says */ 1864 fas216_set_stc(info, 0); 1865 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1866 1867 /* flush FIFO */ 1868 fas216_cmd(info, CMD_FLUSHFIFO); 1869 1870 /* load bus-id and timeout */ 1871 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1872 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1873 1874 /* synchronous transfers */ 1875 fas216_set_sync(info, SCpnt->device->id); 1876 1877 msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1878 1879 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET); 1880 msg->fifo = 1; 1881 1882 fas216_cmd(info, CMD_SELECTATNSTOP); 1883 } 1884 1885 /** 1886 * fas216_kick - kick a command to the interface 1887 * @info: our host interface to kick 1888 * 1889 * Kick a command to the interface, interface should be idle. 1890 * Notes: Interrupts are always disabled! 1891 */ fas216_kick(FAS216_Info * info)1892 static void fas216_kick(FAS216_Info *info) 1893 { 1894 struct scsi_cmnd *SCpnt = NULL; 1895 #define TYPE_OTHER 0 1896 #define TYPE_RESET 1 1897 #define TYPE_QUEUE 2 1898 int where_from = TYPE_OTHER; 1899 1900 fas216_checkmagic(info); 1901 1902 /* 1903 * Obtain the next command to process. 1904 */ 1905 do { 1906 if (info->rstSCpnt) { 1907 SCpnt = info->rstSCpnt; 1908 /* don't remove it */ 1909 where_from = TYPE_RESET; 1910 break; 1911 } 1912 1913 if (info->reqSCpnt) { 1914 SCpnt = info->reqSCpnt; 1915 info->reqSCpnt = NULL; 1916 break; 1917 } 1918 1919 if (info->origSCpnt) { 1920 SCpnt = info->origSCpnt; 1921 info->origSCpnt = NULL; 1922 break; 1923 } 1924 1925 /* retrieve next command */ 1926 if (!SCpnt) { 1927 SCpnt = queue_remove_exclude(&info->queues.issue, 1928 info->busyluns); 1929 where_from = TYPE_QUEUE; 1930 break; 1931 } 1932 } while (0); 1933 1934 if (!SCpnt) { 1935 /* 1936 * no command pending, so enable reselection. 1937 */ 1938 fas216_cmd(info, CMD_ENABLESEL); 1939 return; 1940 } 1941 1942 /* 1943 * We're going to start a command, so disable reselection 1944 */ 1945 fas216_cmd(info, CMD_DISABLESEL); 1946 1947 if (info->scsi.disconnectable && info->SCpnt) { 1948 fas216_log(info, LOG_CONNECT, 1949 "moved command for %d to disconnected queue", 1950 info->SCpnt->device->id); 1951 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 1952 info->scsi.disconnectable = 0; 1953 info->SCpnt = NULL; 1954 } 1955 1956 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt, 1957 "starting"); 1958 1959 switch (where_from) { 1960 case TYPE_QUEUE: 1961 fas216_allocate_tag(info, SCpnt); 1962 fallthrough; 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 */ fas216_devicereset_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)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 */ fas216_rq_sns_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)2001 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 2002 unsigned int result) 2003 { 2004 struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt); 2005 2006 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2007 "request sense complete, result=0x%04x%02x%02x", 2008 result, scsi_pointer->Message, scsi_pointer->Status); 2009 2010 if (result != DID_OK || scsi_pointer->Status != SAM_STAT_GOOD) 2011 /* 2012 * Something went wrong. Make sure that we don't 2013 * have valid data in the sense buffer that could 2014 * confuse the higher levels. 2015 */ 2016 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); 2017 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id); 2018 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); } 2019 /* 2020 * Note that we don't set SCpnt->result, since that should 2021 * reflect the status of the command that we were asked by 2022 * the upper layers to process. This would have been set 2023 * correctly by fas216_std_done. 2024 */ 2025 scsi_eh_restore_cmnd(SCpnt, &info->ses); 2026 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt); 2027 } 2028 2029 /** 2030 * fas216_std_done - finish processing of standard command 2031 * @info: interface that completed 2032 * @SCpnt: command that completed 2033 * @result: driver byte of result 2034 * 2035 * Finish processing of standard command 2036 */ 2037 static void fas216_std_done(FAS216_Info * info,struct scsi_cmnd * SCpnt,unsigned int result)2038 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) 2039 { 2040 struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt); 2041 2042 info->stats.fins += 1; 2043 2044 set_host_byte(SCpnt, result); 2045 if (result == DID_OK) 2046 scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message); 2047 set_status_byte(SCpnt, info->scsi.SCp.Status); 2048 2049 fas216_log_command(info, LOG_CONNECT, SCpnt, 2050 "command complete, result=0x%08x", SCpnt->result); 2051 2052 /* 2053 * If the driver detected an error, we're all done. 2054 */ 2055 if (get_host_byte(SCpnt) != DID_OK) 2056 goto done; 2057 2058 /* 2059 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED 2060 * status, request the sense information. 2061 */ 2062 if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION || 2063 get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED) 2064 goto request_sense; 2065 2066 /* 2067 * If the command did not complete with GOOD status, 2068 * we are all done here. 2069 */ 2070 if (get_status_byte(SCpnt) != SAM_STAT_GOOD) 2071 goto done; 2072 2073 /* 2074 * We have successfully completed a command. Make sure that 2075 * we do not have any buffers left to transfer. The world 2076 * is not perfect, and we seem to occasionally hit this. 2077 * It can be indicative of a buggy driver, target or the upper 2078 * levels of the SCSI code. 2079 */ 2080 if (info->scsi.SCp.ptr) { 2081 switch (SCpnt->cmnd[0]) { 2082 case INQUIRY: 2083 case START_STOP: 2084 case MODE_SENSE: 2085 break; 2086 2087 default: 2088 scmd_printk(KERN_ERR, SCpnt, 2089 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n", 2090 SCpnt->result, info->scsi.SCp.ptr, 2091 info->scsi.SCp.this_residual); 2092 scsi_print_command(SCpnt); 2093 set_host_byte(SCpnt, DID_ERROR); 2094 goto request_sense; 2095 } 2096 } 2097 2098 done: 2099 if (fas216_cmd_priv(SCpnt)->scsi_done) { 2100 fas216_cmd_priv(SCpnt)->scsi_done(SCpnt); 2101 return; 2102 } 2103 2104 panic("scsi%d.H: null scsi_done function in fas216_done", 2105 info->host->host_no); 2106 2107 2108 request_sense: 2109 if (SCpnt->cmnd[0] == REQUEST_SENSE) 2110 goto done; 2111 2112 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0); 2113 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2114 "requesting sense"); 2115 init_SCp(SCpnt); 2116 scsi_pointer->Message = 0; 2117 scsi_pointer->Status = 0; 2118 SCpnt->host_scribble = (void *)fas216_rq_sns_done; 2119 2120 /* 2121 * Place this command into the high priority "request 2122 * sense" slot. This will be the very next command 2123 * executed, unless a target connects to us. 2124 */ 2125 if (info->reqSCpnt) 2126 printk(KERN_WARNING "scsi%d.%c: losing request command\n", 2127 info->host->host_no, '0' + SCpnt->device->id); 2128 info->reqSCpnt = SCpnt; 2129 } 2130 2131 /** 2132 * fas216_done - complete processing for current command 2133 * @info: interface that completed 2134 * @result: driver byte of result 2135 * 2136 * Complete processing for current command 2137 */ fas216_done(FAS216_Info * info,unsigned int result)2138 static void fas216_done(FAS216_Info *info, unsigned int result) 2139 { 2140 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int); 2141 struct scsi_cmnd *SCpnt; 2142 unsigned long flags; 2143 2144 fas216_checkmagic(info); 2145 2146 if (!info->SCpnt) 2147 goto no_command; 2148 2149 SCpnt = info->SCpnt; 2150 info->SCpnt = NULL; 2151 info->scsi.phase = PHASE_IDLE; 2152 2153 if (info->scsi.aborting) { 2154 fas216_log(info, 0, "uncaught abort - returning DID_ABORT"); 2155 result = DID_ABORT; 2156 info->scsi.aborting = 0; 2157 } 2158 2159 /* 2160 * Sanity check the completion - if we have zero bytes left 2161 * to transfer, we should not have a valid pointer. 2162 */ 2163 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) { 2164 scmd_printk(KERN_INFO, SCpnt, 2165 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n", 2166 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 2167 info->scsi.SCp.ptr = NULL; 2168 scsi_print_command(SCpnt); 2169 } 2170 2171 /* 2172 * Clear down this command as completed. If we need to request 2173 * the sense information, fas216_kick will re-assert the busy 2174 * status. 2175 */ 2176 info->device[SCpnt->device->id].parity_check = 0; 2177 clear_bit(SCpnt->device->id * 8 + 2178 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2179 2180 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble; 2181 fn(info, SCpnt, result); 2182 2183 if (info->scsi.irq) { 2184 spin_lock_irqsave(&info->host_lock, flags); 2185 if (info->scsi.phase == PHASE_IDLE) 2186 fas216_kick(info); 2187 spin_unlock_irqrestore(&info->host_lock, flags); 2188 } 2189 return; 2190 2191 no_command: 2192 panic("scsi%d.H: null command in fas216_done", 2193 info->host->host_no); 2194 } 2195 2196 /** 2197 * fas216_queue_command_internal - queue a command for the adapter to process 2198 * @SCpnt: Command to queue 2199 * @done: done function to call once command is complete 2200 * 2201 * Queue a command for adapter to process. 2202 * Returns: 0 on success, else error. 2203 * Notes: io_request_lock is held, interrupts are disabled. 2204 */ fas216_queue_command_internal(struct scsi_cmnd * SCpnt,void (* done)(struct scsi_cmnd *))2205 static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt, 2206 void (*done)(struct scsi_cmnd *)) 2207 { 2208 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2209 int result; 2210 2211 fas216_checkmagic(info); 2212 2213 fas216_log_command(info, LOG_CONNECT, SCpnt, 2214 "received command (%p)", SCpnt); 2215 2216 fas216_cmd_priv(SCpnt)->scsi_done = done; 2217 SCpnt->host_scribble = (void *)fas216_std_done; 2218 SCpnt->result = 0; 2219 2220 init_SCp(SCpnt); 2221 2222 info->stats.queues += 1; 2223 2224 spin_lock(&info->host_lock); 2225 2226 /* 2227 * Add command into execute queue and let it complete under 2228 * whatever scheme we're using. 2229 */ 2230 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt); 2231 2232 /* 2233 * If we successfully added the command, 2234 * kick the interface to get it moving. 2235 */ 2236 if (result == 0 && info->scsi.phase == PHASE_IDLE) 2237 fas216_kick(info); 2238 spin_unlock(&info->host_lock); 2239 2240 fas216_log_target(info, LOG_CONNECT, -1, "queue %s", 2241 result ? "failure" : "success"); 2242 2243 return result; 2244 } 2245 fas216_queue_command_lck(struct scsi_cmnd * SCpnt)2246 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt) 2247 { 2248 return fas216_queue_command_internal(SCpnt, scsi_done); 2249 } 2250 DEF_SCSI_QCMD(fas216_queue_command)2251 DEF_SCSI_QCMD(fas216_queue_command) 2252 2253 /** 2254 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command 2255 * @SCpnt: Command to wake 2256 * 2257 * Trigger restart of a waiting thread in fas216_command 2258 */ 2259 static void fas216_internal_done(struct scsi_cmnd *SCpnt) 2260 { 2261 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2262 2263 fas216_checkmagic(info); 2264 2265 info->internal_done = 1; 2266 } 2267 2268 /** 2269 * fas216_noqueue_command - process a command for the adapter. 2270 * @SCpnt: Command to queue 2271 * 2272 * Queue a command for adapter to process. 2273 * Returns: scsi result code. 2274 * Notes: io_request_lock is held, interrupts are disabled. 2275 */ fas216_noqueue_command_lck(struct scsi_cmnd * SCpnt)2276 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt) 2277 { 2278 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2279 2280 fas216_checkmagic(info); 2281 2282 /* 2283 * We should only be using this if we don't have an interrupt. 2284 * Provide some "incentive" to use the queueing code. 2285 */ 2286 BUG_ON(info->scsi.irq); 2287 2288 info->internal_done = 0; 2289 fas216_queue_command_internal(SCpnt, fas216_internal_done); 2290 2291 /* 2292 * This wastes time, since we can't return until the command is 2293 * complete. We can't sleep either since we may get re-entered! 2294 * However, we must re-enable interrupts, or else we'll be 2295 * waiting forever. 2296 */ 2297 spin_unlock_irq(info->host->host_lock); 2298 2299 while (!info->internal_done) { 2300 /* 2301 * If we don't have an IRQ, then we must poll the card for 2302 * it's interrupt, and use that to call this driver's 2303 * interrupt routine. That way, we keep the command 2304 * progressing. Maybe we can add some intelligence here 2305 * and go to sleep if we know that the device is going 2306 * to be some time (eg, disconnected). 2307 */ 2308 if (fas216_readb(info, REG_STAT) & STAT_INT) { 2309 spin_lock_irq(info->host->host_lock); 2310 fas216_intr(info); 2311 spin_unlock_irq(info->host->host_lock); 2312 } 2313 } 2314 2315 spin_lock_irq(info->host->host_lock); 2316 2317 scsi_done(SCpnt); 2318 2319 return 0; 2320 } 2321 DEF_SCSI_QCMD(fas216_noqueue_command)2322 DEF_SCSI_QCMD(fas216_noqueue_command) 2323 2324 /* 2325 * Error handler timeout function. Indicate that we timed out, 2326 * and wake up any error handler process so it can continue. 2327 */ 2328 static void fas216_eh_timer(struct timer_list *t) 2329 { 2330 FAS216_Info *info = from_timer(info, t, eh_timer); 2331 2332 fas216_log(info, LOG_ERROR, "error handling timed out\n"); 2333 2334 del_timer(&info->eh_timer); 2335 2336 if (info->rst_bus_status == 0) 2337 info->rst_bus_status = -1; 2338 if (info->rst_dev_status == 0) 2339 info->rst_dev_status = -1; 2340 2341 wake_up(&info->eh_wait); 2342 } 2343 2344 enum res_find { 2345 res_failed, /* not found */ 2346 res_success, /* command on issue queue */ 2347 res_hw_abort /* command on disconnected dev */ 2348 }; 2349 2350 /** 2351 * fas216_do_abort - decide how to abort a command 2352 * @SCpnt: command to abort 2353 * 2354 * Decide how to abort a command. 2355 * Returns: abort status 2356 */ fas216_find_command(FAS216_Info * info,struct scsi_cmnd * SCpnt)2357 static enum res_find fas216_find_command(FAS216_Info *info, 2358 struct scsi_cmnd *SCpnt) 2359 { 2360 enum res_find res = res_failed; 2361 2362 if (queue_remove_cmd(&info->queues.issue, SCpnt)) { 2363 /* 2364 * The command was on the issue queue, and has not been 2365 * issued yet. We can remove the command from the queue, 2366 * and acknowledge the abort. Neither the device nor the 2367 * interface know about the command. 2368 */ 2369 printk("on issue queue "); 2370 2371 res = res_success; 2372 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) { 2373 /* 2374 * The command was on the disconnected queue. We must 2375 * reconnect with the device if possible, and send it 2376 * an abort message. 2377 */ 2378 printk("on disconnected queue "); 2379 2380 res = res_hw_abort; 2381 } else if (info->SCpnt == SCpnt) { 2382 printk("executing "); 2383 2384 switch (info->scsi.phase) { 2385 /* 2386 * If the interface is idle, and the command is 'disconnectable', 2387 * then it is the same as on the disconnected queue. 2388 */ 2389 case PHASE_IDLE: 2390 if (info->scsi.disconnectable) { 2391 info->scsi.disconnectable = 0; 2392 info->SCpnt = NULL; 2393 res = res_hw_abort; 2394 } 2395 break; 2396 2397 default: 2398 break; 2399 } 2400 } else if (info->origSCpnt == SCpnt) { 2401 /* 2402 * The command will be executed next, but a command 2403 * is currently using the interface. This is similar to 2404 * being on the issue queue, except the busylun bit has 2405 * been set. 2406 */ 2407 info->origSCpnt = NULL; 2408 clear_bit(SCpnt->device->id * 8 + 2409 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2410 printk("waiting for execution "); 2411 res = res_success; 2412 } else 2413 printk("unknown "); 2414 2415 return res; 2416 } 2417 2418 /** 2419 * fas216_eh_abort - abort this command 2420 * @SCpnt: command to abort 2421 * 2422 * Abort this command. 2423 * Returns: FAILED if unable to abort 2424 * Notes: io_request_lock is taken, and irqs are disabled 2425 */ fas216_eh_abort(struct scsi_cmnd * SCpnt)2426 int fas216_eh_abort(struct scsi_cmnd *SCpnt) 2427 { 2428 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2429 int result = FAILED; 2430 2431 fas216_checkmagic(info); 2432 2433 info->stats.aborts += 1; 2434 2435 scmd_printk(KERN_WARNING, SCpnt, "abort command\n"); 2436 2437 print_debug_list(); 2438 fas216_dumpstate(info); 2439 2440 switch (fas216_find_command(info, SCpnt)) { 2441 /* 2442 * We found the command, and cleared it out. Either 2443 * the command is still known to be executing on the 2444 * target, or the busylun bit is not set. 2445 */ 2446 case res_success: 2447 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt); 2448 result = SUCCESS; 2449 break; 2450 2451 /* 2452 * We need to reconnect to the target and send it an 2453 * ABORT or ABORT_TAG message. We can only do this 2454 * if the bus is free. 2455 */ 2456 case res_hw_abort: 2457 2458 /* 2459 * We are unable to abort the command for some reason. 2460 */ 2461 default: 2462 case res_failed: 2463 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt); 2464 break; 2465 } 2466 2467 return result; 2468 } 2469 2470 /** 2471 * fas216_eh_device_reset - Reset the device associated with this command 2472 * @SCpnt: command specifing device to reset 2473 * 2474 * Reset the device associated with this command. 2475 * Returns: FAILED if unable to reset. 2476 * Notes: We won't be re-entered, so we'll only have one device 2477 * reset on the go at one time. 2478 */ fas216_eh_device_reset(struct scsi_cmnd * SCpnt)2479 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt) 2480 { 2481 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2482 unsigned long flags; 2483 int i, res = FAILED, target = SCpnt->device->id; 2484 2485 fas216_log(info, LOG_ERROR, "device reset for target %d", target); 2486 2487 spin_lock_irqsave(&info->host_lock, flags); 2488 2489 do { 2490 /* 2491 * If we are currently connected to a device, and 2492 * it is the device we want to reset, there is 2493 * nothing we can do here. Chances are it is stuck, 2494 * and we need a bus reset. 2495 */ 2496 if (info->SCpnt && !info->scsi.disconnectable && 2497 info->SCpnt->device->id == SCpnt->device->id) 2498 break; 2499 2500 /* 2501 * We're going to be resetting this device. Remove 2502 * all pending commands from the driver. By doing 2503 * so, we guarantee that we won't touch the command 2504 * structures except to process the reset request. 2505 */ 2506 queue_remove_all_target(&info->queues.issue, target); 2507 queue_remove_all_target(&info->queues.disconnected, target); 2508 if (info->origSCpnt && info->origSCpnt->device->id == target) 2509 info->origSCpnt = NULL; 2510 if (info->reqSCpnt && info->reqSCpnt->device->id == target) 2511 info->reqSCpnt = NULL; 2512 for (i = 0; i < 8; i++) 2513 clear_bit(target * 8 + i, info->busyluns); 2514 2515 /* 2516 * Hijack this SCSI command structure to send 2517 * a bus device reset message to this device. 2518 */ 2519 SCpnt->host_scribble = (void *)fas216_devicereset_done; 2520 2521 info->rst_dev_status = 0; 2522 info->rstSCpnt = SCpnt; 2523 2524 if (info->scsi.phase == PHASE_IDLE) 2525 fas216_kick(info); 2526 2527 mod_timer(&info->eh_timer, jiffies + 30 * HZ); 2528 spin_unlock_irqrestore(&info->host_lock, flags); 2529 2530 /* 2531 * Wait up to 30 seconds for the reset to complete. 2532 */ 2533 wait_event(info->eh_wait, info->rst_dev_status); 2534 2535 del_timer_sync(&info->eh_timer); 2536 spin_lock_irqsave(&info->host_lock, flags); 2537 info->rstSCpnt = NULL; 2538 2539 if (info->rst_dev_status == 1) 2540 res = SUCCESS; 2541 } while (0); 2542 2543 SCpnt->host_scribble = NULL; 2544 spin_unlock_irqrestore(&info->host_lock, flags); 2545 2546 fas216_log(info, LOG_ERROR, "device reset complete: %s\n", 2547 res == SUCCESS ? "success" : "failed"); 2548 2549 return res; 2550 } 2551 2552 /** 2553 * fas216_eh_bus_reset - Reset the bus associated with the command 2554 * @SCpnt: command specifing bus to reset 2555 * 2556 * Reset the bus associated with the command. 2557 * Returns: FAILED if unable to reset. 2558 * Notes: Further commands are blocked. 2559 */ fas216_eh_bus_reset(struct scsi_cmnd * SCpnt)2560 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt) 2561 { 2562 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2563 unsigned long flags; 2564 struct scsi_device *SDpnt; 2565 2566 fas216_checkmagic(info); 2567 fas216_log(info, LOG_ERROR, "resetting bus"); 2568 2569 info->stats.bus_resets += 1; 2570 2571 spin_lock_irqsave(&info->host_lock, flags); 2572 2573 /* 2574 * Stop all activity on this interface. 2575 */ 2576 fas216_aborttransfer(info); 2577 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2578 2579 /* 2580 * Clear any pending interrupts. 2581 */ 2582 while (fas216_readb(info, REG_STAT) & STAT_INT) 2583 fas216_readb(info, REG_INST); 2584 2585 info->rst_bus_status = 0; 2586 2587 /* 2588 * For each attached hard-reset device, clear out 2589 * all command structures. Leave the running 2590 * command in place. 2591 */ 2592 shost_for_each_device(SDpnt, info->host) { 2593 int i; 2594 2595 if (SDpnt->soft_reset) 2596 continue; 2597 2598 queue_remove_all_target(&info->queues.issue, SDpnt->id); 2599 queue_remove_all_target(&info->queues.disconnected, SDpnt->id); 2600 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id) 2601 info->origSCpnt = NULL; 2602 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id) 2603 info->reqSCpnt = NULL; 2604 info->SCpnt = NULL; 2605 2606 for (i = 0; i < 8; i++) 2607 clear_bit(SDpnt->id * 8 + i, info->busyluns); 2608 } 2609 2610 info->scsi.phase = PHASE_IDLE; 2611 2612 /* 2613 * Reset the SCSI bus. Device cleanup happens in 2614 * the interrupt handler. 2615 */ 2616 fas216_cmd(info, CMD_RESETSCSI); 2617 2618 mod_timer(&info->eh_timer, jiffies + HZ); 2619 spin_unlock_irqrestore(&info->host_lock, flags); 2620 2621 /* 2622 * Wait one second for the interrupt. 2623 */ 2624 wait_event(info->eh_wait, info->rst_bus_status); 2625 del_timer_sync(&info->eh_timer); 2626 2627 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n", 2628 info->rst_bus_status == 1 ? "success" : "failed"); 2629 2630 return info->rst_bus_status == 1 ? SUCCESS : FAILED; 2631 } 2632 2633 /** 2634 * fas216_init_chip - Initialise FAS216 state after reset 2635 * @info: state structure for interface 2636 * 2637 * Initialise FAS216 state after reset 2638 */ fas216_init_chip(FAS216_Info * info)2639 static void fas216_init_chip(FAS216_Info *info) 2640 { 2641 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7; 2642 fas216_writeb(info, REG_CLKF, clock); 2643 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2644 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]); 2645 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2646 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 2647 fas216_writeb(info, REG_SOF, 0); 2648 fas216_writeb(info, REG_STP, info->scsi.async_stp); 2649 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2650 } 2651 2652 /** 2653 * fas216_eh_host_reset - Reset the host associated with this command 2654 * @SCpnt: command specifing host to reset 2655 * 2656 * Reset the host associated with this command. 2657 * Returns: FAILED if unable to reset. 2658 * Notes: io_request_lock is taken, and irqs are disabled 2659 */ fas216_eh_host_reset(struct scsi_cmnd * SCpnt)2660 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt) 2661 { 2662 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2663 2664 spin_lock_irq(info->host->host_lock); 2665 2666 fas216_checkmagic(info); 2667 2668 fas216_log(info, LOG_ERROR, "resetting host"); 2669 2670 /* 2671 * Reset the SCSI chip. 2672 */ 2673 fas216_cmd(info, CMD_RESETCHIP); 2674 2675 /* 2676 * Ugly ugly ugly! 2677 * We need to release the host_lock and enable 2678 * IRQs if we sleep, but we must relock and disable 2679 * IRQs after the sleep. 2680 */ 2681 spin_unlock_irq(info->host->host_lock); 2682 msleep(50 * 1000/100); 2683 spin_lock_irq(info->host->host_lock); 2684 2685 /* 2686 * Release the SCSI reset. 2687 */ 2688 fas216_cmd(info, CMD_NOP); 2689 2690 fas216_init_chip(info); 2691 2692 spin_unlock_irq(info->host->host_lock); 2693 return SUCCESS; 2694 } 2695 2696 #define TYPE_UNKNOWN 0 2697 #define TYPE_NCR53C90 1 2698 #define TYPE_NCR53C90A 2 2699 #define TYPE_NCR53C9x 3 2700 #define TYPE_Am53CF94 4 2701 #define TYPE_EmFAS216 5 2702 #define TYPE_QLFAS216 6 2703 2704 static char *chip_types[] = { 2705 "unknown", 2706 "NS NCR53C90", 2707 "NS NCR53C90A", 2708 "NS NCR53C9x", 2709 "AMD Am53CF94", 2710 "Emulex FAS216", 2711 "QLogic FAS216" 2712 }; 2713 fas216_detect_type(FAS216_Info * info)2714 static int fas216_detect_type(FAS216_Info *info) 2715 { 2716 int family, rev; 2717 2718 /* 2719 * Reset the chip. 2720 */ 2721 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2722 udelay(50); 2723 fas216_writeb(info, REG_CMD, CMD_NOP); 2724 2725 /* 2726 * Check to see if control reg 2 is present. 2727 */ 2728 fas216_writeb(info, REG_CNTL3, 0); 2729 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE); 2730 2731 /* 2732 * If we are unable to read back control reg 2 2733 * correctly, it is not present, and we have a 2734 * NCR53C90. 2735 */ 2736 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE) 2737 return TYPE_NCR53C90; 2738 2739 /* 2740 * Now, check control register 3 2741 */ 2742 fas216_writeb(info, REG_CNTL2, 0); 2743 fas216_writeb(info, REG_CNTL3, 0); 2744 fas216_writeb(info, REG_CNTL3, 5); 2745 2746 /* 2747 * If we are unable to read the register back 2748 * correctly, we have a NCR53C90A 2749 */ 2750 if (fas216_readb(info, REG_CNTL3) != 5) 2751 return TYPE_NCR53C90A; 2752 2753 /* 2754 * Now read the ID from the chip. 2755 */ 2756 fas216_writeb(info, REG_CNTL3, 0); 2757 2758 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK); 2759 fas216_writeb(info, REG_CNTL3, 0); 2760 2761 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2762 udelay(50); 2763 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP); 2764 2765 fas216_writeb(info, REG_CNTL2, CNTL2_ENF); 2766 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2767 udelay(50); 2768 fas216_writeb(info, REG_CMD, CMD_NOP); 2769 2770 rev = fas216_readb(info, REG_ID); 2771 family = rev >> 3; 2772 rev &= 7; 2773 2774 switch (family) { 2775 case 0x01: 2776 if (rev == 4) 2777 return TYPE_Am53CF94; 2778 break; 2779 2780 case 0x02: 2781 switch (rev) { 2782 case 2: 2783 return TYPE_EmFAS216; 2784 case 3: 2785 return TYPE_QLFAS216; 2786 } 2787 break; 2788 2789 default: 2790 break; 2791 } 2792 printk("family %x rev %x\n", family, rev); 2793 return TYPE_NCR53C9x; 2794 } 2795 2796 /** 2797 * fas216_reset_state - Initialise driver internal state 2798 * @info: state to initialise 2799 * 2800 * Initialise driver internal state 2801 */ fas216_reset_state(FAS216_Info * info)2802 static void fas216_reset_state(FAS216_Info *info) 2803 { 2804 int i; 2805 2806 fas216_checkmagic(info); 2807 2808 fas216_bus_reset(info); 2809 2810 /* 2811 * Clear out all stale info in our state structure 2812 */ 2813 memset(info->busyluns, 0, sizeof(info->busyluns)); 2814 info->scsi.disconnectable = 0; 2815 info->scsi.aborting = 0; 2816 2817 for (i = 0; i < 8; i++) { 2818 info->device[i].parity_enabled = 0; 2819 info->device[i].parity_check = 1; 2820 } 2821 2822 /* 2823 * Drain all commands on disconnected queue 2824 */ 2825 while (queue_remove(&info->queues.disconnected) != NULL); 2826 2827 /* 2828 * Remove executing commands. 2829 */ 2830 info->SCpnt = NULL; 2831 info->reqSCpnt = NULL; 2832 info->rstSCpnt = NULL; 2833 info->origSCpnt = NULL; 2834 } 2835 2836 /** 2837 * fas216_init - initialise FAS/NCR/AMD SCSI structures. 2838 * @host: a driver-specific filled-out structure 2839 * 2840 * Initialise FAS/NCR/AMD SCSI structures. 2841 * Returns: 0 on success 2842 */ fas216_init(struct Scsi_Host * host)2843 int fas216_init(struct Scsi_Host *host) 2844 { 2845 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2846 2847 info->magic_start = MAGIC; 2848 info->magic_end = MAGIC; 2849 info->host = host; 2850 info->scsi.cfg[0] = host->this_id | CNTL1_PERE; 2851 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE; 2852 info->scsi.cfg[2] = info->ifcfg.cntl3 | 2853 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM; 2854 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod); 2855 2856 info->rst_dev_status = -1; 2857 info->rst_bus_status = -1; 2858 init_waitqueue_head(&info->eh_wait); 2859 timer_setup(&info->eh_timer, fas216_eh_timer, 0); 2860 2861 spin_lock_init(&info->host_lock); 2862 2863 memset(&info->stats, 0, sizeof(info->stats)); 2864 2865 msgqueue_initialise(&info->scsi.msgs); 2866 2867 if (!queue_initialise(&info->queues.issue)) 2868 return -ENOMEM; 2869 2870 if (!queue_initialise(&info->queues.disconnected)) { 2871 queue_free(&info->queues.issue); 2872 return -ENOMEM; 2873 } 2874 2875 return 0; 2876 } 2877 2878 /** 2879 * fas216_add - initialise FAS/NCR/AMD SCSI ic. 2880 * @host: a driver-specific filled-out structure 2881 * @dev: parent device 2882 * 2883 * Initialise FAS/NCR/AMD SCSI ic. 2884 * Returns: 0 on success 2885 */ fas216_add(struct Scsi_Host * host,struct device * dev)2886 int fas216_add(struct Scsi_Host *host, struct device *dev) 2887 { 2888 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2889 int type, ret; 2890 2891 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) { 2892 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n", 2893 info->ifcfg.clockrate); 2894 return -EINVAL; 2895 } 2896 2897 fas216_reset_state(info); 2898 type = fas216_detect_type(info); 2899 info->scsi.type = chip_types[type]; 2900 2901 udelay(300); 2902 2903 /* 2904 * Initialise the chip correctly. 2905 */ 2906 fas216_init_chip(info); 2907 2908 /* 2909 * Reset the SCSI bus. We don't want to see 2910 * the resulting reset interrupt, so mask it 2911 * out. 2912 */ 2913 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR); 2914 fas216_writeb(info, REG_CMD, CMD_RESETSCSI); 2915 2916 /* 2917 * scsi standard says wait 250ms 2918 */ 2919 spin_unlock_irq(info->host->host_lock); 2920 msleep(100*1000/100); 2921 spin_lock_irq(info->host->host_lock); 2922 2923 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2924 fas216_readb(info, REG_INST); 2925 2926 fas216_checkmagic(info); 2927 2928 ret = scsi_add_host(host, dev); 2929 if (ret) 2930 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2931 else 2932 scsi_scan_host(host); 2933 2934 return ret; 2935 } 2936 fas216_remove(struct Scsi_Host * host)2937 void fas216_remove(struct Scsi_Host *host) 2938 { 2939 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2940 2941 fas216_checkmagic(info); 2942 scsi_remove_host(host); 2943 2944 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2945 scsi_host_put(host); 2946 } 2947 2948 /** 2949 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic. 2950 * @host: a driver-specific filled-out structure 2951 * 2952 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic. 2953 */ fas216_release(struct Scsi_Host * host)2954 void fas216_release(struct Scsi_Host *host) 2955 { 2956 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2957 2958 queue_free(&info->queues.disconnected); 2959 queue_free(&info->queues.issue); 2960 } 2961 fas216_print_host(FAS216_Info * info,struct seq_file * m)2962 void fas216_print_host(FAS216_Info *info, struct seq_file *m) 2963 { 2964 seq_printf(m, 2965 "\n" 2966 "Chip : %s\n" 2967 " Address: 0x%p\n" 2968 " IRQ : %d\n" 2969 " DMA : %d\n", 2970 info->scsi.type, info->scsi.io_base, 2971 info->scsi.irq, info->scsi.dma); 2972 } 2973 fas216_print_stats(FAS216_Info * info,struct seq_file * m)2974 void fas216_print_stats(FAS216_Info *info, struct seq_file *m) 2975 { 2976 seq_printf(m, "\n" 2977 "Command Statistics:\n" 2978 " Queued : %u\n" 2979 " Issued : %u\n" 2980 " Completed : %u\n" 2981 " Reads : %u\n" 2982 " Writes : %u\n" 2983 " Others : %u\n" 2984 " Disconnects: %u\n" 2985 " Aborts : %u\n" 2986 " Bus resets : %u\n" 2987 " Host resets: %u\n", 2988 info->stats.queues, info->stats.removes, 2989 info->stats.fins, info->stats.reads, 2990 info->stats.writes, info->stats.miscs, 2991 info->stats.disconnects, info->stats.aborts, 2992 info->stats.bus_resets, info->stats.host_resets); 2993 } 2994 fas216_print_devices(FAS216_Info * info,struct seq_file * m)2995 void fas216_print_devices(FAS216_Info *info, struct seq_file *m) 2996 { 2997 struct fas216_device *dev; 2998 struct scsi_device *scd; 2999 3000 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n"); 3001 3002 shost_for_each_device(scd, info->host) { 3003 dev = &info->device[scd->id]; 3004 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 3005 if (scd->tagged_supported) 3006 seq_printf(m, "%3sabled ", 3007 scd->simple_tags ? "en" : "dis"); 3008 else 3009 seq_puts(m, "unsupported "); 3010 3011 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis"); 3012 3013 if (dev->sof) 3014 seq_printf(m, "offset %d, %d ns\n", 3015 dev->sof, dev->period * 4); 3016 else 3017 seq_puts(m, "async\n"); 3018 } 3019 } 3020 3021 EXPORT_SYMBOL(fas216_init); 3022 EXPORT_SYMBOL(fas216_add); 3023 EXPORT_SYMBOL(fas216_queue_command); 3024 EXPORT_SYMBOL(fas216_noqueue_command); 3025 EXPORT_SYMBOL(fas216_intr); 3026 EXPORT_SYMBOL(fas216_remove); 3027 EXPORT_SYMBOL(fas216_release); 3028 EXPORT_SYMBOL(fas216_eh_abort); 3029 EXPORT_SYMBOL(fas216_eh_device_reset); 3030 EXPORT_SYMBOL(fas216_eh_bus_reset); 3031 EXPORT_SYMBOL(fas216_eh_host_reset); 3032 EXPORT_SYMBOL(fas216_print_host); 3033 EXPORT_SYMBOL(fas216_print_stats); 3034 EXPORT_SYMBOL(fas216_print_devices); 3035 3036 MODULE_AUTHOR("Russell King"); 3037 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core"); 3038 MODULE_LICENSE("GPL"); 3039