1 /* 2 * Copyright (c) 1996 John Shifflett, GeoLog Consulting 3 * john@geolog.com 4 * jshiffle@netcom.com 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 as published by 8 * the Free Software Foundation; either version 2, or (at your option) 9 * any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 /* 18 * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC 19 * provided much of the inspiration and some of the code for this 20 * driver. Everything I know about Amiga DMA was gleaned from careful 21 * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I 22 * borrowed shamelessly from all over that source. Thanks Hamish! 23 * 24 * _This_ driver is (I feel) an improvement over the old one in 25 * several respects: 26 * 27 * - Target Disconnection/Reconnection is now supported. Any 28 * system with more than one device active on the SCSI bus 29 * will benefit from this. The driver defaults to what I 30 * call 'adaptive disconnect' - meaning that each command 31 * is evaluated individually as to whether or not it should 32 * be run with the option to disconnect/reselect (if the 33 * device chooses), or as a "SCSI-bus-hog". 34 * 35 * - Synchronous data transfers are now supported. Because of 36 * a few devices that choke after telling the driver that 37 * they can do sync transfers, we don't automatically use 38 * this faster protocol - it can be enabled via the command- 39 * line on a device-by-device basis. 40 * 41 * - Runtime operating parameters can now be specified through 42 * the 'amiboot' or the 'insmod' command line. For amiboot do: 43 * "amiboot [usual stuff] wd33c93=blah,blah,blah" 44 * The defaults should be good for most people. See the comment 45 * for 'setup_strings' below for more details. 46 * 47 * - The old driver relied exclusively on what the Western Digital 48 * docs call "Combination Level 2 Commands", which are a great 49 * idea in that the CPU is relieved of a lot of interrupt 50 * overhead. However, by accepting a certain (user-settable) 51 * amount of additional interrupts, this driver achieves 52 * better control over the SCSI bus, and data transfers are 53 * almost as fast while being much easier to define, track, 54 * and debug. 55 * 56 * 57 * TODO: 58 * more speed. linked commands. 59 * 60 * 61 * People with bug reports, wish-lists, complaints, comments, 62 * or improvements are asked to pah-leeez email me (John Shifflett) 63 * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get 64 * this thing into as good a shape as possible, and I'm positive 65 * there are lots of lurking bugs and "Stupid Places". 66 * 67 * Updates: 68 * 69 * Added support for pre -A chips, which don't have advanced features 70 * and will generate CSR_RESEL rather than CSR_RESEL_AM. 71 * Richard Hirst <richard@sleepie.demon.co.uk> August 2000 72 */ 73 74 #include <linux/config.h> 75 #include <linux/module.h> 76 77 #include <linux/sched.h> 78 #include <linux/string.h> 79 #include <linux/delay.h> 80 #include <linux/init.h> 81 #include <linux/interrupt.h> 82 #include <linux/blkdev.h> 83 84 #include <scsi/scsi.h> 85 #include <scsi/scsi_cmnd.h> 86 #include <scsi/scsi_device.h> 87 #include <scsi/scsi_host.h> 88 89 #include "wd33c93.h" 90 91 92 #define WD33C93_VERSION "1.26" 93 #define WD33C93_DATE "22/Feb/2003" 94 95 MODULE_AUTHOR("John Shifflett"); 96 MODULE_DESCRIPTION("Generic WD33C93 SCSI driver"); 97 MODULE_LICENSE("GPL"); 98 99 /* 100 * 'setup_strings' is a single string used to pass operating parameters and 101 * settings from the kernel/module command-line to the driver. 'setup_args[]' 102 * is an array of strings that define the compile-time default values for 103 * these settings. If Linux boots with an amiboot or insmod command-line, 104 * those settings are combined with 'setup_args[]'. Note that amiboot 105 * command-lines are prefixed with "wd33c93=" while insmod uses a 106 * "setup_strings=" prefix. The driver recognizes the following keywords 107 * (lower case required) and arguments: 108 * 109 * - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with 110 * the 7 possible SCSI devices. Set a bit to negotiate for 111 * asynchronous transfers on that device. To maintain 112 * backwards compatibility, a command-line such as 113 * "wd33c93=255" will be automatically translated to 114 * "wd33c93=nosync:0xff". 115 * - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is 116 * optional - if not present, same as "nodma:1". 117 * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer 118 * period. Default is 500; acceptable values are 250 - 1000. 119 * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them. 120 * x = 1 does 'adaptive' disconnects, which is the default 121 * and generally the best choice. 122 * - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes 123 * various types of debug output to printed - see the DB_xxx 124 * defines in wd33c93.h 125 * - clock:x -x = clock input in MHz for WD33c93 chip. Normal values 126 * would be from 8 through 20. Default is 8. 127 * - next -No argument. Used to separate blocks of keywords when 128 * there's more than one host adapter in the system. 129 * 130 * Syntax Notes: 131 * - Numeric arguments can be decimal or the '0x' form of hex notation. There 132 * _must_ be a colon between a keyword and its numeric argument, with no 133 * spaces. 134 * - Keywords are separated by commas, no spaces, in the standard kernel 135 * command-line manner. 136 * - A keyword in the 'nth' comma-separated command-line member will overwrite 137 * the 'nth' element of setup_args[]. A blank command-line member (in 138 * other words, a comma with no preceding keyword) will _not_ overwrite 139 * the corresponding setup_args[] element. 140 * - If a keyword is used more than once, the first one applies to the first 141 * SCSI host found, the second to the second card, etc, unless the 'next' 142 * keyword is used to change the order. 143 * 144 * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'): 145 * - wd33c93=nosync:255 146 * - wd33c93=nodma 147 * - wd33c93=nodma:1 148 * - wd33c93=disconnect:2,nosync:0x08,period:250 149 * - wd33c93=debug:0x1c 150 */ 151 152 /* Normally, no defaults are specified */ 153 static char *setup_args[] = { "", "", "", "", "", "", "", "", "" }; 154 155 static char *setup_strings; 156 module_param(setup_strings, charp, 0); 157 158 static void wd33c93_execute(struct Scsi_Host *instance); 159 160 #ifdef CONFIG_WD33C93_PIO 161 static inline uchar 162 read_wd33c93(const wd33c93_regs regs, uchar reg_num) 163 { 164 uchar data; 165 166 outb(reg_num, regs.SASR); 167 data = inb(regs.SCMD); 168 return data; 169 } 170 171 static inline unsigned long 172 read_wd33c93_count(const wd33c93_regs regs) 173 { 174 unsigned long value; 175 176 outb(WD_TRANSFER_COUNT_MSB, regs.SASR); 177 value = inb(regs.SCMD) << 16; 178 value |= inb(regs.SCMD) << 8; 179 value |= inb(regs.SCMD); 180 return value; 181 } 182 183 static inline uchar 184 read_aux_stat(const wd33c93_regs regs) 185 { 186 return inb(regs.SASR); 187 } 188 189 static inline void 190 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) 191 { 192 outb(reg_num, regs.SASR); 193 outb(value, regs.SCMD); 194 } 195 196 static inline void 197 write_wd33c93_count(const wd33c93_regs regs, unsigned long value) 198 { 199 outb(WD_TRANSFER_COUNT_MSB, regs.SASR); 200 outb((value >> 16) & 0xff, regs.SCMD); 201 outb((value >> 8) & 0xff, regs.SCMD); 202 outb( value & 0xff, regs.SCMD); 203 } 204 205 #define write_wd33c93_cmd(regs, cmd) \ 206 write_wd33c93((regs), WD_COMMAND, (cmd)) 207 208 static inline void 209 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) 210 { 211 int i; 212 213 outb(WD_CDB_1, regs.SASR); 214 for (i=0; i<len; i++) 215 outb(cmnd[i], regs.SCMD); 216 } 217 218 #else /* CONFIG_WD33C93_PIO */ 219 static inline uchar 220 read_wd33c93(const wd33c93_regs regs, uchar reg_num) 221 { 222 *regs.SASR = reg_num; 223 mb(); 224 return (*regs.SCMD); 225 } 226 227 static unsigned long 228 read_wd33c93_count(const wd33c93_regs regs) 229 { 230 unsigned long value; 231 232 *regs.SASR = WD_TRANSFER_COUNT_MSB; 233 mb(); 234 value = *regs.SCMD << 16; 235 value |= *regs.SCMD << 8; 236 value |= *regs.SCMD; 237 mb(); 238 return value; 239 } 240 241 static inline uchar 242 read_aux_stat(const wd33c93_regs regs) 243 { 244 return *regs.SASR; 245 } 246 247 static inline void 248 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) 249 { 250 *regs.SASR = reg_num; 251 mb(); 252 *regs.SCMD = value; 253 mb(); 254 } 255 256 static void 257 write_wd33c93_count(const wd33c93_regs regs, unsigned long value) 258 { 259 *regs.SASR = WD_TRANSFER_COUNT_MSB; 260 mb(); 261 *regs.SCMD = value >> 16; 262 *regs.SCMD = value >> 8; 263 *regs.SCMD = value; 264 mb(); 265 } 266 267 static inline void 268 write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd) 269 { 270 *regs.SASR = WD_COMMAND; 271 mb(); 272 *regs.SCMD = cmd; 273 mb(); 274 } 275 276 static inline void 277 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) 278 { 279 int i; 280 281 *regs.SASR = WD_CDB_1; 282 for (i = 0; i < len; i++) 283 *regs.SCMD = cmnd[i]; 284 } 285 #endif /* CONFIG_WD33C93_PIO */ 286 287 static inline uchar 288 read_1_byte(const wd33c93_regs regs) 289 { 290 uchar asr; 291 uchar x = 0; 292 293 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 294 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80); 295 do { 296 asr = read_aux_stat(regs); 297 if (asr & ASR_DBR) 298 x = read_wd33c93(regs, WD_DATA); 299 } while (!(asr & ASR_INT)); 300 return x; 301 } 302 303 static struct sx_period sx_table[] = { 304 {1, 0x20}, 305 {252, 0x20}, 306 {376, 0x30}, 307 {500, 0x40}, 308 {624, 0x50}, 309 {752, 0x60}, 310 {876, 0x70}, 311 {1000, 0x00}, 312 {0, 0} 313 }; 314 315 static int 316 round_period(unsigned int period) 317 { 318 int x; 319 320 for (x = 1; sx_table[x].period_ns; x++) { 321 if ((period <= sx_table[x - 0].period_ns) && 322 (period > sx_table[x - 1].period_ns)) { 323 return x; 324 } 325 } 326 return 7; 327 } 328 329 static uchar 330 calc_sync_xfer(unsigned int period, unsigned int offset) 331 { 332 uchar result; 333 334 period *= 4; /* convert SDTR code to ns */ 335 result = sx_table[round_period(period)].reg_value; 336 result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF; 337 return result; 338 } 339 340 int 341 wd33c93_queuecommand(struct scsi_cmnd *cmd, 342 void (*done)(struct scsi_cmnd *)) 343 { 344 struct WD33C93_hostdata *hostdata; 345 struct scsi_cmnd *tmp; 346 347 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; 348 349 DB(DB_QUEUE_COMMAND, 350 printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->pid)) 351 352 /* Set up a few fields in the scsi_cmnd structure for our own use: 353 * - host_scribble is the pointer to the next cmd in the input queue 354 * - scsi_done points to the routine we call when a cmd is finished 355 * - result is what you'd expect 356 */ 357 cmd->host_scribble = NULL; 358 cmd->scsi_done = done; 359 cmd->result = 0; 360 361 /* We use the Scsi_Pointer structure that's included with each command 362 * as a scratchpad (as it's intended to be used!). The handy thing about 363 * the SCp.xxx fields is that they're always associated with a given 364 * cmd, and are preserved across disconnect-reselect. This means we 365 * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages 366 * if we keep all the critical pointers and counters in SCp: 367 * - SCp.ptr is the pointer into the RAM buffer 368 * - SCp.this_residual is the size of that buffer 369 * - SCp.buffer points to the current scatter-gather buffer 370 * - SCp.buffers_residual tells us how many S.G. buffers there are 371 * - SCp.have_data_in is not used 372 * - SCp.sent_command is not used 373 * - SCp.phase records this command's SRCID_ER bit setting 374 */ 375 376 if (cmd->use_sg) { 377 cmd->SCp.buffer = (struct scatterlist *) cmd->buffer; 378 cmd->SCp.buffers_residual = cmd->use_sg - 1; 379 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) + 380 cmd->SCp.buffer->offset; 381 cmd->SCp.this_residual = cmd->SCp.buffer->length; 382 } else { 383 cmd->SCp.buffer = NULL; 384 cmd->SCp.buffers_residual = 0; 385 cmd->SCp.ptr = (char *) cmd->request_buffer; 386 cmd->SCp.this_residual = cmd->request_bufflen; 387 } 388 389 /* WD docs state that at the conclusion of a "LEVEL2" command, the 390 * status byte can be retrieved from the LUN register. Apparently, 391 * this is the case only for *uninterrupted* LEVEL2 commands! If 392 * there are any unexpected phases entered, even if they are 100% 393 * legal (different devices may choose to do things differently), 394 * the LEVEL2 command sequence is exited. This often occurs prior 395 * to receiving the status byte, in which case the driver does a 396 * status phase interrupt and gets the status byte on its own. 397 * While such a command can then be "resumed" (ie restarted to 398 * finish up as a LEVEL2 command), the LUN register will NOT be 399 * a valid status byte at the command's conclusion, and we must 400 * use the byte obtained during the earlier interrupt. Here, we 401 * preset SCp.Status to an illegal value (0xff) so that when 402 * this command finally completes, we can tell where the actual 403 * status byte is stored. 404 */ 405 406 cmd->SCp.Status = ILLEGAL_STATUS_BYTE; 407 408 /* 409 * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE 410 * commands are added to the head of the queue so that the desired 411 * sense data is not lost before REQUEST_SENSE executes. 412 */ 413 414 spin_lock_irq(&hostdata->lock); 415 416 if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) { 417 cmd->host_scribble = (uchar *) hostdata->input_Q; 418 hostdata->input_Q = cmd; 419 } else { /* find the end of the queue */ 420 for (tmp = (struct scsi_cmnd *) hostdata->input_Q; 421 tmp->host_scribble; 422 tmp = (struct scsi_cmnd *) tmp->host_scribble) ; 423 tmp->host_scribble = (uchar *) cmd; 424 } 425 426 /* We know that there's at least one command in 'input_Q' now. 427 * Go see if any of them are runnable! 428 */ 429 430 wd33c93_execute(cmd->device->host); 431 432 DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->pid)) 433 434 spin_unlock_irq(&hostdata->lock); 435 return 0; 436 } 437 438 /* 439 * This routine attempts to start a scsi command. If the host_card is 440 * already connected, we give up immediately. Otherwise, look through 441 * the input_Q, using the first command we find that's intended 442 * for a currently non-busy target/lun. 443 * 444 * wd33c93_execute() is always called with interrupts disabled or from 445 * the wd33c93_intr itself, which means that a wd33c93 interrupt 446 * cannot occur while we are in here. 447 */ 448 static void 449 wd33c93_execute(struct Scsi_Host *instance) 450 { 451 struct WD33C93_hostdata *hostdata = 452 (struct WD33C93_hostdata *) instance->hostdata; 453 const wd33c93_regs regs = hostdata->regs; 454 struct scsi_cmnd *cmd, *prev; 455 456 DB(DB_EXECUTE, printk("EX(")) 457 if (hostdata->selecting || hostdata->connected) { 458 DB(DB_EXECUTE, printk(")EX-0 ")) 459 return; 460 } 461 462 /* 463 * Search through the input_Q for a command destined 464 * for an idle target/lun. 465 */ 466 467 cmd = (struct scsi_cmnd *) hostdata->input_Q; 468 prev = NULL; 469 while (cmd) { 470 if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))) 471 break; 472 prev = cmd; 473 cmd = (struct scsi_cmnd *) cmd->host_scribble; 474 } 475 476 /* quit if queue empty or all possible targets are busy */ 477 478 if (!cmd) { 479 DB(DB_EXECUTE, printk(")EX-1 ")) 480 return; 481 } 482 483 /* remove command from queue */ 484 485 if (prev) 486 prev->host_scribble = cmd->host_scribble; 487 else 488 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble; 489 490 #ifdef PROC_STATISTICS 491 hostdata->cmd_cnt[cmd->device->id]++; 492 #endif 493 494 /* 495 * Start the selection process 496 */ 497 498 if (cmd->sc_data_direction == DMA_TO_DEVICE) 499 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); 500 else 501 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD); 502 503 /* Now we need to figure out whether or not this command is a good 504 * candidate for disconnect/reselect. We guess to the best of our 505 * ability, based on a set of hierarchical rules. When several 506 * devices are operating simultaneously, disconnects are usually 507 * an advantage. In a single device system, or if only 1 device 508 * is being accessed, transfers usually go faster if disconnects 509 * are not allowed: 510 * 511 * + Commands should NEVER disconnect if hostdata->disconnect = 512 * DIS_NEVER (this holds for tape drives also), and ALWAYS 513 * disconnect if hostdata->disconnect = DIS_ALWAYS. 514 * + Tape drive commands should always be allowed to disconnect. 515 * + Disconnect should be allowed if disconnected_Q isn't empty. 516 * + Commands should NOT disconnect if input_Q is empty. 517 * + Disconnect should be allowed if there are commands in input_Q 518 * for a different target/lun. In this case, the other commands 519 * should be made disconnect-able, if not already. 520 * 521 * I know, I know - this code would flunk me out of any 522 * "C Programming 101" class ever offered. But it's easy 523 * to change around and experiment with for now. 524 */ 525 526 cmd->SCp.phase = 0; /* assume no disconnect */ 527 if (hostdata->disconnect == DIS_NEVER) 528 goto no; 529 if (hostdata->disconnect == DIS_ALWAYS) 530 goto yes; 531 if (cmd->device->type == 1) /* tape drive? */ 532 goto yes; 533 if (hostdata->disconnected_Q) /* other commands disconnected? */ 534 goto yes; 535 if (!(hostdata->input_Q)) /* input_Q empty? */ 536 goto no; 537 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; 538 prev = (struct scsi_cmnd *) prev->host_scribble) { 539 if ((prev->device->id != cmd->device->id) || 540 (prev->device->lun != cmd->device->lun)) { 541 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; 542 prev = (struct scsi_cmnd *) prev->host_scribble) 543 prev->SCp.phase = 1; 544 goto yes; 545 } 546 } 547 548 goto no; 549 550 yes: 551 cmd->SCp.phase = 1; 552 553 #ifdef PROC_STATISTICS 554 hostdata->disc_allowed_cnt[cmd->device->id]++; 555 #endif 556 557 no: 558 559 write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0)); 560 561 write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun); 562 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 563 hostdata->sync_xfer[cmd->device->id]); 564 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 565 566 if ((hostdata->level2 == L2_NONE) || 567 (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) { 568 569 /* 570 * Do a 'Select-With-ATN' command. This will end with 571 * one of the following interrupts: 572 * CSR_RESEL_AM: failure - can try again later. 573 * CSR_TIMEOUT: failure - give up. 574 * CSR_SELECT: success - proceed. 575 */ 576 577 hostdata->selecting = cmd; 578 579 /* Every target has its own synchronous transfer setting, kept in the 580 * sync_xfer array, and a corresponding status byte in sync_stat[]. 581 * Each target's sync_stat[] entry is initialized to SX_UNSET, and its 582 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET 583 * means that the parameters are undetermined as yet, and that we 584 * need to send an SDTR message to this device after selection is 585 * complete: We set SS_FIRST to tell the interrupt routine to do so. 586 * If we've been asked not to try synchronous transfers on this 587 * target (and _all_ luns within it), we'll still send the SDTR message 588 * later, but at that time we'll negotiate for async by specifying a 589 * sync fifo depth of 0. 590 */ 591 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET) 592 hostdata->sync_stat[cmd->device->id] = SS_FIRST; 593 hostdata->state = S_SELECTING; 594 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 595 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN); 596 } else { 597 598 /* 599 * Do a 'Select-With-ATN-Xfer' command. This will end with 600 * one of the following interrupts: 601 * CSR_RESEL_AM: failure - can try again later. 602 * CSR_TIMEOUT: failure - give up. 603 * anything else: success - proceed. 604 */ 605 606 hostdata->connected = cmd; 607 write_wd33c93(regs, WD_COMMAND_PHASE, 0); 608 609 /* copy command_descriptor_block into WD chip 610 * (take advantage of auto-incrementing) 611 */ 612 613 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd); 614 615 /* The wd33c93 only knows about Group 0, 1, and 5 commands when 616 * it's doing a 'select-and-transfer'. To be safe, we write the 617 * size of the CDB into the OWN_ID register for every case. This 618 * way there won't be problems with vendor-unique, audio, etc. 619 */ 620 621 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len); 622 623 /* When doing a non-disconnect command with DMA, we can save 624 * ourselves a DATA phase interrupt later by setting everything 625 * up ahead of time. 626 */ 627 628 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) { 629 if (hostdata->dma_setup(cmd, 630 (cmd->sc_data_direction == DMA_TO_DEVICE) ? 631 DATA_OUT_DIR : DATA_IN_DIR)) 632 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 633 else { 634 write_wd33c93_count(regs, 635 cmd->SCp.this_residual); 636 write_wd33c93(regs, WD_CONTROL, 637 CTRL_IDI | CTRL_EDI | CTRL_DMA); 638 hostdata->dma = D_DMA_RUNNING; 639 } 640 } else 641 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 642 643 hostdata->state = S_RUNNING_LEVEL2; 644 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 645 } 646 647 /* 648 * Since the SCSI bus can handle only 1 connection at a time, 649 * we get out of here now. If the selection fails, or when 650 * the command disconnects, we'll come back to this routine 651 * to search the input_Q again... 652 */ 653 654 DB(DB_EXECUTE, 655 printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid)) 656 } 657 658 static void 659 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt, 660 int data_in_dir, struct WD33C93_hostdata *hostdata) 661 { 662 uchar asr; 663 664 DB(DB_TRANSFER, 665 printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out")) 666 667 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 668 write_wd33c93_count(regs, cnt); 669 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); 670 if (data_in_dir) { 671 do { 672 asr = read_aux_stat(regs); 673 if (asr & ASR_DBR) 674 *buf++ = read_wd33c93(regs, WD_DATA); 675 } while (!(asr & ASR_INT)); 676 } else { 677 do { 678 asr = read_aux_stat(regs); 679 if (asr & ASR_DBR) 680 write_wd33c93(regs, WD_DATA, *buf++); 681 } while (!(asr & ASR_INT)); 682 } 683 684 /* Note: we are returning with the interrupt UN-cleared. 685 * Since (presumably) an entire I/O operation has 686 * completed, the bus phase is probably different, and 687 * the interrupt routine will discover this when it 688 * responds to the uncleared int. 689 */ 690 691 } 692 693 static void 694 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd, 695 int data_in_dir) 696 { 697 struct WD33C93_hostdata *hostdata; 698 unsigned long length; 699 700 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; 701 702 /* Normally, you'd expect 'this_residual' to be non-zero here. 703 * In a series of scatter-gather transfers, however, this 704 * routine will usually be called with 'this_residual' equal 705 * to 0 and 'buffers_residual' non-zero. This means that a 706 * previous transfer completed, clearing 'this_residual', and 707 * now we need to setup the next scatter-gather buffer as the 708 * source or destination for THIS transfer. 709 */ 710 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 711 ++cmd->SCp.buffer; 712 --cmd->SCp.buffers_residual; 713 cmd->SCp.this_residual = cmd->SCp.buffer->length; 714 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) + 715 cmd->SCp.buffer->offset; 716 } 717 718 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 719 hostdata->sync_xfer[cmd->device->id]); 720 721 /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA. 722 * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns. 723 */ 724 725 if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) { 726 #ifdef PROC_STATISTICS 727 hostdata->pio_cnt++; 728 #endif 729 transfer_pio(regs, (uchar *) cmd->SCp.ptr, 730 cmd->SCp.this_residual, data_in_dir, hostdata); 731 length = cmd->SCp.this_residual; 732 cmd->SCp.this_residual = read_wd33c93_count(regs); 733 cmd->SCp.ptr += (length - cmd->SCp.this_residual); 734 } 735 736 /* We are able to do DMA (in fact, the Amiga hardware is 737 * already going!), so start up the wd33c93 in DMA mode. 738 * We set 'hostdata->dma' = D_DMA_RUNNING so that when the 739 * transfer completes and causes an interrupt, we're 740 * reminded to tell the Amiga to shut down its end. We'll 741 * postpone the updating of 'this_residual' and 'ptr' 742 * until then. 743 */ 744 745 else { 746 #ifdef PROC_STATISTICS 747 hostdata->dma_cnt++; 748 #endif 749 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_DMA); 750 write_wd33c93_count(regs, cmd->SCp.this_residual); 751 752 if ((hostdata->level2 >= L2_DATA) || 753 (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) { 754 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 755 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 756 hostdata->state = S_RUNNING_LEVEL2; 757 } else 758 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); 759 760 hostdata->dma = D_DMA_RUNNING; 761 } 762 } 763 764 void 765 wd33c93_intr(struct Scsi_Host *instance) 766 { 767 struct WD33C93_hostdata *hostdata = 768 (struct WD33C93_hostdata *) instance->hostdata; 769 const wd33c93_regs regs = hostdata->regs; 770 struct scsi_cmnd *patch, *cmd; 771 uchar asr, sr, phs, id, lun, *ucp, msg; 772 unsigned long length, flags; 773 774 asr = read_aux_stat(regs); 775 if (!(asr & ASR_INT) || (asr & ASR_BSY)) 776 return; 777 778 spin_lock_irqsave(&hostdata->lock, flags); 779 780 #ifdef PROC_STATISTICS 781 hostdata->int_cnt++; 782 #endif 783 784 cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */ 785 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */ 786 phs = read_wd33c93(regs, WD_COMMAND_PHASE); 787 788 DB(DB_INTR, printk("{%02x:%02x-", asr, sr)) 789 790 /* After starting a DMA transfer, the next interrupt 791 * is guaranteed to be in response to completion of 792 * the transfer. Since the Amiga DMA hardware runs in 793 * in an open-ended fashion, it needs to be told when 794 * to stop; do that here if D_DMA_RUNNING is true. 795 * Also, we have to update 'this_residual' and 'ptr' 796 * based on the contents of the TRANSFER_COUNT register, 797 * in case the device decided to do an intermediate 798 * disconnect (a device may do this if it has to do a 799 * seek, or just to be nice and let other devices have 800 * some bus time during long transfers). After doing 801 * whatever is needed, we go on and service the WD3393 802 * interrupt normally. 803 */ 804 if (hostdata->dma == D_DMA_RUNNING) { 805 DB(DB_TRANSFER, 806 printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual)) 807 hostdata->dma_stop(cmd->device->host, cmd, 1); 808 hostdata->dma = D_DMA_OFF; 809 length = cmd->SCp.this_residual; 810 cmd->SCp.this_residual = read_wd33c93_count(regs); 811 cmd->SCp.ptr += (length - cmd->SCp.this_residual); 812 DB(DB_TRANSFER, 813 printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual)) 814 } 815 816 /* Respond to the specific WD3393 interrupt - there are quite a few! */ 817 switch (sr) { 818 case CSR_TIMEOUT: 819 DB(DB_INTR, printk("TIMEOUT")) 820 821 if (hostdata->state == S_RUNNING_LEVEL2) 822 hostdata->connected = NULL; 823 else { 824 cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */ 825 hostdata->selecting = NULL; 826 } 827 828 cmd->result = DID_NO_CONNECT << 16; 829 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 830 hostdata->state = S_UNCONNECTED; 831 cmd->scsi_done(cmd); 832 833 /* From esp.c: 834 * There is a window of time within the scsi_done() path 835 * of execution where interrupts are turned back on full 836 * blast and left that way. During that time we could 837 * reconnect to a disconnected command, then we'd bomb 838 * out below. We could also end up executing two commands 839 * at _once_. ...just so you know why the restore_flags() 840 * is here... 841 */ 842 843 spin_unlock_irqrestore(&hostdata->lock, flags); 844 845 /* We are not connected to a target - check to see if there 846 * are commands waiting to be executed. 847 */ 848 849 wd33c93_execute(instance); 850 break; 851 852 /* Note: this interrupt should not occur in a LEVEL2 command */ 853 854 case CSR_SELECT: 855 DB(DB_INTR, printk("SELECT")) 856 hostdata->connected = cmd = 857 (struct scsi_cmnd *) hostdata->selecting; 858 hostdata->selecting = NULL; 859 860 /* construct an IDENTIFY message with correct disconnect bit */ 861 862 hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun); 863 if (cmd->SCp.phase) 864 hostdata->outgoing_msg[0] |= 0x40; 865 866 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) { 867 #ifdef SYNC_DEBUG 868 printk(" sending SDTR "); 869 #endif 870 871 hostdata->sync_stat[cmd->device->id] = SS_WAITING; 872 873 /* Tack on a 2nd message to ask about synchronous transfers. If we've 874 * been asked to do only asynchronous transfers on this device, we 875 * request a fifo depth of 0, which is equivalent to async - should 876 * solve the problems some people have had with GVP's Guru ROM. 877 */ 878 879 hostdata->outgoing_msg[1] = EXTENDED_MESSAGE; 880 hostdata->outgoing_msg[2] = 3; 881 hostdata->outgoing_msg[3] = EXTENDED_SDTR; 882 if (hostdata->no_sync & (1 << cmd->device->id)) { 883 hostdata->outgoing_msg[4] = 884 hostdata->default_sx_per / 4; 885 hostdata->outgoing_msg[5] = 0; 886 } else { 887 hostdata->outgoing_msg[4] = OPTIMUM_SX_PER / 4; 888 hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF; 889 } 890 hostdata->outgoing_len = 6; 891 } else 892 hostdata->outgoing_len = 1; 893 894 hostdata->state = S_CONNECTED; 895 spin_unlock_irqrestore(&hostdata->lock, flags); 896 break; 897 898 case CSR_XFER_DONE | PHS_DATA_IN: 899 case CSR_UNEXP | PHS_DATA_IN: 900 case CSR_SRV_REQ | PHS_DATA_IN: 901 DB(DB_INTR, 902 printk("IN-%d.%d", cmd->SCp.this_residual, 903 cmd->SCp.buffers_residual)) 904 transfer_bytes(regs, cmd, DATA_IN_DIR); 905 if (hostdata->state != S_RUNNING_LEVEL2) 906 hostdata->state = S_CONNECTED; 907 spin_unlock_irqrestore(&hostdata->lock, flags); 908 break; 909 910 case CSR_XFER_DONE | PHS_DATA_OUT: 911 case CSR_UNEXP | PHS_DATA_OUT: 912 case CSR_SRV_REQ | PHS_DATA_OUT: 913 DB(DB_INTR, 914 printk("OUT-%d.%d", cmd->SCp.this_residual, 915 cmd->SCp.buffers_residual)) 916 transfer_bytes(regs, cmd, DATA_OUT_DIR); 917 if (hostdata->state != S_RUNNING_LEVEL2) 918 hostdata->state = S_CONNECTED; 919 spin_unlock_irqrestore(&hostdata->lock, flags); 920 break; 921 922 /* Note: this interrupt should not occur in a LEVEL2 command */ 923 924 case CSR_XFER_DONE | PHS_COMMAND: 925 case CSR_UNEXP | PHS_COMMAND: 926 case CSR_SRV_REQ | PHS_COMMAND: 927 DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->pid)) 928 transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, 929 hostdata); 930 hostdata->state = S_CONNECTED; 931 spin_unlock_irqrestore(&hostdata->lock, flags); 932 break; 933 934 case CSR_XFER_DONE | PHS_STATUS: 935 case CSR_UNEXP | PHS_STATUS: 936 case CSR_SRV_REQ | PHS_STATUS: 937 DB(DB_INTR, printk("STATUS=")) 938 cmd->SCp.Status = read_1_byte(regs); 939 DB(DB_INTR, printk("%02x", cmd->SCp.Status)) 940 if (hostdata->level2 >= L2_BASIC) { 941 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ 942 udelay(7); 943 hostdata->state = S_RUNNING_LEVEL2; 944 write_wd33c93(regs, WD_COMMAND_PHASE, 0x50); 945 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 946 } else { 947 hostdata->state = S_CONNECTED; 948 } 949 spin_unlock_irqrestore(&hostdata->lock, flags); 950 break; 951 952 case CSR_XFER_DONE | PHS_MESS_IN: 953 case CSR_UNEXP | PHS_MESS_IN: 954 case CSR_SRV_REQ | PHS_MESS_IN: 955 DB(DB_INTR, printk("MSG_IN=")) 956 957 msg = read_1_byte(regs); 958 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ 959 udelay(7); 960 961 hostdata->incoming_msg[hostdata->incoming_ptr] = msg; 962 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE) 963 msg = EXTENDED_MESSAGE; 964 else 965 hostdata->incoming_ptr = 0; 966 967 cmd->SCp.Message = msg; 968 switch (msg) { 969 970 case COMMAND_COMPLETE: 971 DB(DB_INTR, printk("CCMP-%ld", cmd->pid)) 972 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 973 hostdata->state = S_PRE_CMP_DISC; 974 break; 975 976 case SAVE_POINTERS: 977 DB(DB_INTR, printk("SDP")) 978 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 979 hostdata->state = S_CONNECTED; 980 break; 981 982 case RESTORE_POINTERS: 983 DB(DB_INTR, printk("RDP")) 984 if (hostdata->level2 >= L2_BASIC) { 985 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 986 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 987 hostdata->state = S_RUNNING_LEVEL2; 988 } else { 989 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 990 hostdata->state = S_CONNECTED; 991 } 992 break; 993 994 case DISCONNECT: 995 DB(DB_INTR, printk("DIS")) 996 cmd->device->disconnect = 1; 997 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 998 hostdata->state = S_PRE_TMP_DISC; 999 break; 1000 1001 case MESSAGE_REJECT: 1002 DB(DB_INTR, printk("REJ")) 1003 #ifdef SYNC_DEBUG 1004 printk("-REJ-"); 1005 #endif 1006 if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) 1007 hostdata->sync_stat[cmd->device->id] = SS_SET; 1008 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1009 hostdata->state = S_CONNECTED; 1010 break; 1011 1012 case EXTENDED_MESSAGE: 1013 DB(DB_INTR, printk("EXT")) 1014 1015 ucp = hostdata->incoming_msg; 1016 1017 #ifdef SYNC_DEBUG 1018 printk("%02x", ucp[hostdata->incoming_ptr]); 1019 #endif 1020 /* Is this the last byte of the extended message? */ 1021 1022 if ((hostdata->incoming_ptr >= 2) && 1023 (hostdata->incoming_ptr == (ucp[1] + 1))) { 1024 1025 switch (ucp[2]) { /* what's the EXTENDED code? */ 1026 case EXTENDED_SDTR: 1027 id = calc_sync_xfer(ucp[3], ucp[4]); 1028 if (hostdata->sync_stat[cmd->device->id] != 1029 SS_WAITING) { 1030 1031 /* A device has sent an unsolicited SDTR message; rather than go 1032 * through the effort of decoding it and then figuring out what 1033 * our reply should be, we're just gonna say that we have a 1034 * synchronous fifo depth of 0. This will result in asynchronous 1035 * transfers - not ideal but so much easier. 1036 * Actually, this is OK because it assures us that if we don't 1037 * specifically ask for sync transfers, we won't do any. 1038 */ 1039 1040 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1041 hostdata->outgoing_msg[0] = 1042 EXTENDED_MESSAGE; 1043 hostdata->outgoing_msg[1] = 3; 1044 hostdata->outgoing_msg[2] = 1045 EXTENDED_SDTR; 1046 hostdata->outgoing_msg[3] = 1047 hostdata->default_sx_per / 1048 4; 1049 hostdata->outgoing_msg[4] = 0; 1050 hostdata->outgoing_len = 5; 1051 hostdata->sync_xfer[cmd->device->id] = 1052 calc_sync_xfer(hostdata-> 1053 default_sx_per 1054 / 4, 0); 1055 } else { 1056 hostdata->sync_xfer[cmd->device->id] = id; 1057 } 1058 #ifdef SYNC_DEBUG 1059 printk("sync_xfer=%02x", 1060 hostdata->sync_xfer[cmd->device->id]); 1061 #endif 1062 hostdata->sync_stat[cmd->device->id] = 1063 SS_SET; 1064 write_wd33c93_cmd(regs, 1065 WD_CMD_NEGATE_ACK); 1066 hostdata->state = S_CONNECTED; 1067 break; 1068 case EXTENDED_WDTR: 1069 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1070 printk("sending WDTR "); 1071 hostdata->outgoing_msg[0] = 1072 EXTENDED_MESSAGE; 1073 hostdata->outgoing_msg[1] = 2; 1074 hostdata->outgoing_msg[2] = 1075 EXTENDED_WDTR; 1076 hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */ 1077 hostdata->outgoing_len = 4; 1078 write_wd33c93_cmd(regs, 1079 WD_CMD_NEGATE_ACK); 1080 hostdata->state = S_CONNECTED; 1081 break; 1082 default: 1083 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1084 printk 1085 ("Rejecting Unknown Extended Message(%02x). ", 1086 ucp[2]); 1087 hostdata->outgoing_msg[0] = 1088 MESSAGE_REJECT; 1089 hostdata->outgoing_len = 1; 1090 write_wd33c93_cmd(regs, 1091 WD_CMD_NEGATE_ACK); 1092 hostdata->state = S_CONNECTED; 1093 break; 1094 } 1095 hostdata->incoming_ptr = 0; 1096 } 1097 1098 /* We need to read more MESS_IN bytes for the extended message */ 1099 1100 else { 1101 hostdata->incoming_ptr++; 1102 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1103 hostdata->state = S_CONNECTED; 1104 } 1105 break; 1106 1107 default: 1108 printk("Rejecting Unknown Message(%02x) ", msg); 1109 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1110 hostdata->outgoing_msg[0] = MESSAGE_REJECT; 1111 hostdata->outgoing_len = 1; 1112 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1113 hostdata->state = S_CONNECTED; 1114 } 1115 spin_unlock_irqrestore(&hostdata->lock, flags); 1116 break; 1117 1118 /* Note: this interrupt will occur only after a LEVEL2 command */ 1119 1120 case CSR_SEL_XFER_DONE: 1121 1122 /* Make sure that reselection is enabled at this point - it may 1123 * have been turned off for the command that just completed. 1124 */ 1125 1126 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1127 if (phs == 0x60) { 1128 DB(DB_INTR, printk("SX-DONE-%ld", cmd->pid)) 1129 cmd->SCp.Message = COMMAND_COMPLETE; 1130 lun = read_wd33c93(regs, WD_TARGET_LUN); 1131 DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun)) 1132 hostdata->connected = NULL; 1133 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1134 hostdata->state = S_UNCONNECTED; 1135 if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE) 1136 cmd->SCp.Status = lun; 1137 if (cmd->cmnd[0] == REQUEST_SENSE 1138 && cmd->SCp.Status != GOOD) 1139 cmd->result = 1140 (cmd-> 1141 result & 0x00ffff) | (DID_ERROR << 16); 1142 else 1143 cmd->result = 1144 cmd->SCp.Status | (cmd->SCp.Message << 8); 1145 cmd->scsi_done(cmd); 1146 1147 /* We are no longer connected to a target - check to see if 1148 * there are commands waiting to be executed. 1149 */ 1150 spin_unlock_irqrestore(&hostdata->lock, flags); 1151 wd33c93_execute(instance); 1152 } else { 1153 printk 1154 ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---", 1155 asr, sr, phs, cmd->pid); 1156 spin_unlock_irqrestore(&hostdata->lock, flags); 1157 } 1158 break; 1159 1160 /* Note: this interrupt will occur only after a LEVEL2 command */ 1161 1162 case CSR_SDP: 1163 DB(DB_INTR, printk("SDP")) 1164 hostdata->state = S_RUNNING_LEVEL2; 1165 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41); 1166 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1167 spin_unlock_irqrestore(&hostdata->lock, flags); 1168 break; 1169 1170 case CSR_XFER_DONE | PHS_MESS_OUT: 1171 case CSR_UNEXP | PHS_MESS_OUT: 1172 case CSR_SRV_REQ | PHS_MESS_OUT: 1173 DB(DB_INTR, printk("MSG_OUT=")) 1174 1175 /* To get here, we've probably requested MESSAGE_OUT and have 1176 * already put the correct bytes in outgoing_msg[] and filled 1177 * in outgoing_len. We simply send them out to the SCSI bus. 1178 * Sometimes we get MESSAGE_OUT phase when we're not expecting 1179 * it - like when our SDTR message is rejected by a target. Some 1180 * targets send the REJECT before receiving all of the extended 1181 * message, and then seem to go back to MESSAGE_OUT for a byte 1182 * or two. Not sure why, or if I'm doing something wrong to 1183 * cause this to happen. Regardless, it seems that sending 1184 * NOP messages in these situations results in no harm and 1185 * makes everyone happy. 1186 */ 1187 if (hostdata->outgoing_len == 0) { 1188 hostdata->outgoing_len = 1; 1189 hostdata->outgoing_msg[0] = NOP; 1190 } 1191 transfer_pio(regs, hostdata->outgoing_msg, 1192 hostdata->outgoing_len, DATA_OUT_DIR, hostdata); 1193 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0])) 1194 hostdata->outgoing_len = 0; 1195 hostdata->state = S_CONNECTED; 1196 spin_unlock_irqrestore(&hostdata->lock, flags); 1197 break; 1198 1199 case CSR_UNEXP_DISC: 1200 1201 /* I think I've seen this after a request-sense that was in response 1202 * to an error condition, but not sure. We certainly need to do 1203 * something when we get this interrupt - the question is 'what?'. 1204 * Let's think positively, and assume some command has finished 1205 * in a legal manner (like a command that provokes a request-sense), 1206 * so we treat it as a normal command-complete-disconnect. 1207 */ 1208 1209 /* Make sure that reselection is enabled at this point - it may 1210 * have been turned off for the command that just completed. 1211 */ 1212 1213 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1214 if (cmd == NULL) { 1215 printk(" - Already disconnected! "); 1216 hostdata->state = S_UNCONNECTED; 1217 spin_unlock_irqrestore(&hostdata->lock, flags); 1218 return; 1219 } 1220 DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid)) 1221 hostdata->connected = NULL; 1222 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1223 hostdata->state = S_UNCONNECTED; 1224 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD) 1225 cmd->result = 1226 (cmd->result & 0x00ffff) | (DID_ERROR << 16); 1227 else 1228 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 1229 cmd->scsi_done(cmd); 1230 1231 /* We are no longer connected to a target - check to see if 1232 * there are commands waiting to be executed. 1233 */ 1234 /* look above for comments on scsi_done() */ 1235 spin_unlock_irqrestore(&hostdata->lock, flags); 1236 wd33c93_execute(instance); 1237 break; 1238 1239 case CSR_DISC: 1240 1241 /* Make sure that reselection is enabled at this point - it may 1242 * have been turned off for the command that just completed. 1243 */ 1244 1245 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1246 DB(DB_INTR, printk("DISC-%ld", cmd->pid)) 1247 if (cmd == NULL) { 1248 printk(" - Already disconnected! "); 1249 hostdata->state = S_UNCONNECTED; 1250 } 1251 switch (hostdata->state) { 1252 case S_PRE_CMP_DISC: 1253 hostdata->connected = NULL; 1254 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1255 hostdata->state = S_UNCONNECTED; 1256 DB(DB_INTR, printk(":%d", cmd->SCp.Status)) 1257 if (cmd->cmnd[0] == REQUEST_SENSE 1258 && cmd->SCp.Status != GOOD) 1259 cmd->result = 1260 (cmd-> 1261 result & 0x00ffff) | (DID_ERROR << 16); 1262 else 1263 cmd->result = 1264 cmd->SCp.Status | (cmd->SCp.Message << 8); 1265 cmd->scsi_done(cmd); 1266 break; 1267 case S_PRE_TMP_DISC: 1268 case S_RUNNING_LEVEL2: 1269 cmd->host_scribble = (uchar *) hostdata->disconnected_Q; 1270 hostdata->disconnected_Q = cmd; 1271 hostdata->connected = NULL; 1272 hostdata->state = S_UNCONNECTED; 1273 1274 #ifdef PROC_STATISTICS 1275 hostdata->disc_done_cnt[cmd->device->id]++; 1276 #endif 1277 1278 break; 1279 default: 1280 printk("*** Unexpected DISCONNECT interrupt! ***"); 1281 hostdata->state = S_UNCONNECTED; 1282 } 1283 1284 /* We are no longer connected to a target - check to see if 1285 * there are commands waiting to be executed. 1286 */ 1287 spin_unlock_irqrestore(&hostdata->lock, flags); 1288 wd33c93_execute(instance); 1289 break; 1290 1291 case CSR_RESEL_AM: 1292 case CSR_RESEL: 1293 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : "")) 1294 1295 /* Old chips (pre -A ???) don't have advanced features and will 1296 * generate CSR_RESEL. In that case we have to extract the LUN the 1297 * hard way (see below). 1298 * First we have to make sure this reselection didn't 1299 * happen during Arbitration/Selection of some other device. 1300 * If yes, put losing command back on top of input_Q. 1301 */ 1302 if (hostdata->level2 <= L2_NONE) { 1303 1304 if (hostdata->selecting) { 1305 cmd = (struct scsi_cmnd *) hostdata->selecting; 1306 hostdata->selecting = NULL; 1307 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1308 cmd->host_scribble = 1309 (uchar *) hostdata->input_Q; 1310 hostdata->input_Q = cmd; 1311 } 1312 } 1313 1314 else { 1315 1316 if (cmd) { 1317 if (phs == 0x00) { 1318 hostdata->busy[cmd->device->id] &= 1319 ~(1 << cmd->device->lun); 1320 cmd->host_scribble = 1321 (uchar *) hostdata->input_Q; 1322 hostdata->input_Q = cmd; 1323 } else { 1324 printk 1325 ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---", 1326 asr, sr, phs); 1327 while (1) 1328 printk("\r"); 1329 } 1330 } 1331 1332 } 1333 1334 /* OK - find out which device reselected us. */ 1335 1336 id = read_wd33c93(regs, WD_SOURCE_ID); 1337 id &= SRCID_MASK; 1338 1339 /* and extract the lun from the ID message. (Note that we don't 1340 * bother to check for a valid message here - I guess this is 1341 * not the right way to go, but...) 1342 */ 1343 1344 if (sr == CSR_RESEL_AM) { 1345 lun = read_wd33c93(regs, WD_DATA); 1346 if (hostdata->level2 < L2_RESELECT) 1347 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1348 lun &= 7; 1349 } else { 1350 /* Old chip; wait for msgin phase to pick up the LUN. */ 1351 for (lun = 255; lun; lun--) { 1352 if ((asr = read_aux_stat(regs)) & ASR_INT) 1353 break; 1354 udelay(10); 1355 } 1356 if (!(asr & ASR_INT)) { 1357 printk 1358 ("wd33c93: Reselected without IDENTIFY\n"); 1359 lun = 0; 1360 } else { 1361 /* Verify this is a change to MSG_IN and read the message */ 1362 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1363 udelay(7); 1364 if (sr == (CSR_ABORT | PHS_MESS_IN) || 1365 sr == (CSR_UNEXP | PHS_MESS_IN) || 1366 sr == (CSR_SRV_REQ | PHS_MESS_IN)) { 1367 /* Got MSG_IN, grab target LUN */ 1368 lun = read_1_byte(regs); 1369 /* Now we expect a 'paused with ACK asserted' int.. */ 1370 asr = read_aux_stat(regs); 1371 if (!(asr & ASR_INT)) { 1372 udelay(10); 1373 asr = read_aux_stat(regs); 1374 if (!(asr & ASR_INT)) 1375 printk 1376 ("wd33c93: No int after LUN on RESEL (%02x)\n", 1377 asr); 1378 } 1379 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1380 udelay(7); 1381 if (sr != CSR_MSGIN) 1382 printk 1383 ("wd33c93: Not paused with ACK on RESEL (%02x)\n", 1384 sr); 1385 lun &= 7; 1386 write_wd33c93_cmd(regs, 1387 WD_CMD_NEGATE_ACK); 1388 } else { 1389 printk 1390 ("wd33c93: Not MSG_IN on reselect (%02x)\n", 1391 sr); 1392 lun = 0; 1393 } 1394 } 1395 } 1396 1397 /* Now we look for the command that's reconnecting. */ 1398 1399 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q; 1400 patch = NULL; 1401 while (cmd) { 1402 if (id == cmd->device->id && lun == cmd->device->lun) 1403 break; 1404 patch = cmd; 1405 cmd = (struct scsi_cmnd *) cmd->host_scribble; 1406 } 1407 1408 /* Hmm. Couldn't find a valid command.... What to do? */ 1409 1410 if (!cmd) { 1411 printk 1412 ("---TROUBLE: target %d.%d not in disconnect queue---", 1413 id, lun); 1414 spin_unlock_irqrestore(&hostdata->lock, flags); 1415 return; 1416 } 1417 1418 /* Ok, found the command - now start it up again. */ 1419 1420 if (patch) 1421 patch->host_scribble = cmd->host_scribble; 1422 else 1423 hostdata->disconnected_Q = 1424 (struct scsi_cmnd *) cmd->host_scribble; 1425 hostdata->connected = cmd; 1426 1427 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]' 1428 * because these things are preserved over a disconnect. 1429 * But we DO need to fix the DPD bit so it's correct for this command. 1430 */ 1431 1432 if (cmd->sc_data_direction == DMA_TO_DEVICE) 1433 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); 1434 else 1435 write_wd33c93(regs, WD_DESTINATION_ID, 1436 cmd->device->id | DSTID_DPD); 1437 if (hostdata->level2 >= L2_RESELECT) { 1438 write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */ 1439 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 1440 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1441 hostdata->state = S_RUNNING_LEVEL2; 1442 } else 1443 hostdata->state = S_CONNECTED; 1444 1445 DB(DB_INTR, printk("-%ld", cmd->pid)) 1446 spin_unlock_irqrestore(&hostdata->lock, flags); 1447 break; 1448 1449 default: 1450 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs); 1451 spin_unlock_irqrestore(&hostdata->lock, flags); 1452 } 1453 1454 DB(DB_INTR, printk("} ")) 1455 1456 } 1457 1458 static void 1459 reset_wd33c93(struct Scsi_Host *instance) 1460 { 1461 struct WD33C93_hostdata *hostdata = 1462 (struct WD33C93_hostdata *) instance->hostdata; 1463 const wd33c93_regs regs = hostdata->regs; 1464 uchar sr; 1465 1466 #ifdef CONFIG_SGI_IP22 1467 { 1468 int busycount = 0; 1469 extern void sgiwd93_reset(unsigned long); 1470 /* wait 'til the chip gets some time for us */ 1471 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100) 1472 udelay (10); 1473 /* 1474 * there are scsi devices out there, which manage to lock up 1475 * the wd33c93 in a busy condition. In this state it won't 1476 * accept the reset command. The only way to solve this is to 1477 * give the chip a hardware reset (if possible). The code below 1478 * does this for the SGI Indy, where this is possible 1479 */ 1480 /* still busy ? */ 1481 if (read_aux_stat(regs) & ASR_BSY) 1482 sgiwd93_reset(instance->base); /* yeah, give it the hard one */ 1483 } 1484 #endif 1485 1486 write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF | 1487 instance->this_id | hostdata->clock_freq); 1488 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1489 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 1490 calc_sync_xfer(hostdata->default_sx_per / 4, 1491 DEFAULT_SX_OFF)); 1492 write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET); 1493 1494 1495 #ifdef CONFIG_MVME147_SCSI 1496 udelay(25); /* The old wd33c93 on MVME147 needs this, at least */ 1497 #endif 1498 1499 while (!(read_aux_stat(regs) & ASR_INT)) 1500 ; 1501 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1502 1503 hostdata->microcode = read_wd33c93(regs, WD_CDB_1); 1504 if (sr == 0x00) 1505 hostdata->chip = C_WD33C93; 1506 else if (sr == 0x01) { 1507 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */ 1508 sr = read_wd33c93(regs, WD_QUEUE_TAG); 1509 if (sr == 0xa5) { 1510 hostdata->chip = C_WD33C93B; 1511 write_wd33c93(regs, WD_QUEUE_TAG, 0); 1512 } else 1513 hostdata->chip = C_WD33C93A; 1514 } else 1515 hostdata->chip = C_UNKNOWN_CHIP; 1516 1517 write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE); 1518 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1519 } 1520 1521 int 1522 wd33c93_host_reset(struct scsi_cmnd * SCpnt) 1523 { 1524 struct Scsi_Host *instance; 1525 struct WD33C93_hostdata *hostdata; 1526 int i; 1527 1528 instance = SCpnt->device->host; 1529 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1530 1531 printk("scsi%d: reset. ", instance->host_no); 1532 disable_irq(instance->irq); 1533 1534 hostdata->dma_stop(instance, NULL, 0); 1535 for (i = 0; i < 8; i++) { 1536 hostdata->busy[i] = 0; 1537 hostdata->sync_xfer[i] = 1538 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF); 1539 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ 1540 } 1541 hostdata->input_Q = NULL; 1542 hostdata->selecting = NULL; 1543 hostdata->connected = NULL; 1544 hostdata->disconnected_Q = NULL; 1545 hostdata->state = S_UNCONNECTED; 1546 hostdata->dma = D_DMA_OFF; 1547 hostdata->incoming_ptr = 0; 1548 hostdata->outgoing_len = 0; 1549 1550 reset_wd33c93(instance); 1551 SCpnt->result = DID_RESET << 16; 1552 enable_irq(instance->irq); 1553 return SUCCESS; 1554 } 1555 1556 int 1557 wd33c93_abort(struct scsi_cmnd * cmd) 1558 { 1559 struct Scsi_Host *instance; 1560 struct WD33C93_hostdata *hostdata; 1561 wd33c93_regs regs; 1562 struct scsi_cmnd *tmp, *prev; 1563 1564 disable_irq(cmd->device->host->irq); 1565 1566 instance = cmd->device->host; 1567 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1568 regs = hostdata->regs; 1569 1570 /* 1571 * Case 1 : If the command hasn't been issued yet, we simply remove it 1572 * from the input_Q. 1573 */ 1574 1575 tmp = (struct scsi_cmnd *) hostdata->input_Q; 1576 prev = NULL; 1577 while (tmp) { 1578 if (tmp == cmd) { 1579 if (prev) 1580 prev->host_scribble = cmd->host_scribble; 1581 else 1582 hostdata->input_Q = 1583 (struct scsi_cmnd *) cmd->host_scribble; 1584 cmd->host_scribble = NULL; 1585 cmd->result = DID_ABORT << 16; 1586 printk 1587 ("scsi%d: Abort - removing command %ld from input_Q. ", 1588 instance->host_no, cmd->pid); 1589 enable_irq(cmd->device->host->irq); 1590 cmd->scsi_done(cmd); 1591 return SUCCESS; 1592 } 1593 prev = tmp; 1594 tmp = (struct scsi_cmnd *) tmp->host_scribble; 1595 } 1596 1597 /* 1598 * Case 2 : If the command is connected, we're going to fail the abort 1599 * and let the high level SCSI driver retry at a later time or 1600 * issue a reset. 1601 * 1602 * Timeouts, and therefore aborted commands, will be highly unlikely 1603 * and handling them cleanly in this situation would make the common 1604 * case of noresets less efficient, and would pollute our code. So, 1605 * we fail. 1606 */ 1607 1608 if (hostdata->connected == cmd) { 1609 uchar sr, asr; 1610 unsigned long timeout; 1611 1612 printk("scsi%d: Aborting connected command %ld - ", 1613 instance->host_no, cmd->pid); 1614 1615 printk("stopping DMA - "); 1616 if (hostdata->dma == D_DMA_RUNNING) { 1617 hostdata->dma_stop(instance, cmd, 0); 1618 hostdata->dma = D_DMA_OFF; 1619 } 1620 1621 printk("sending wd33c93 ABORT command - "); 1622 write_wd33c93(regs, WD_CONTROL, 1623 CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1624 write_wd33c93_cmd(regs, WD_CMD_ABORT); 1625 1626 /* Now we have to attempt to flush out the FIFO... */ 1627 1628 printk("flushing fifo - "); 1629 timeout = 1000000; 1630 do { 1631 asr = read_aux_stat(regs); 1632 if (asr & ASR_DBR) 1633 read_wd33c93(regs, WD_DATA); 1634 } while (!(asr & ASR_INT) && timeout-- > 0); 1635 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1636 printk 1637 ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ", 1638 asr, sr, read_wd33c93_count(regs), timeout); 1639 1640 /* 1641 * Abort command processed. 1642 * Still connected. 1643 * We must disconnect. 1644 */ 1645 1646 printk("sending wd33c93 DISCONNECT command - "); 1647 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT); 1648 1649 timeout = 1000000; 1650 asr = read_aux_stat(regs); 1651 while ((asr & ASR_CIP) && timeout-- > 0) 1652 asr = read_aux_stat(regs); 1653 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1654 printk("asr=%02x, sr=%02x.", asr, sr); 1655 1656 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1657 hostdata->connected = NULL; 1658 hostdata->state = S_UNCONNECTED; 1659 cmd->result = DID_ABORT << 16; 1660 1661 /* sti();*/ 1662 wd33c93_execute(instance); 1663 1664 enable_irq(cmd->device->host->irq); 1665 cmd->scsi_done(cmd); 1666 return SUCCESS; 1667 } 1668 1669 /* 1670 * Case 3: If the command is currently disconnected from the bus, 1671 * we're not going to expend much effort here: Let's just return 1672 * an ABORT_SNOOZE and hope for the best... 1673 */ 1674 1675 tmp = (struct scsi_cmnd *) hostdata->disconnected_Q; 1676 while (tmp) { 1677 if (tmp == cmd) { 1678 printk 1679 ("scsi%d: Abort - command %ld found on disconnected_Q - ", 1680 instance->host_no, cmd->pid); 1681 printk("Abort SNOOZE. "); 1682 enable_irq(cmd->device->host->irq); 1683 return FAILED; 1684 } 1685 tmp = (struct scsi_cmnd *) tmp->host_scribble; 1686 } 1687 1688 /* 1689 * Case 4 : If we reached this point, the command was not found in any of 1690 * the queues. 1691 * 1692 * We probably reached this point because of an unlikely race condition 1693 * between the command completing successfully and the abortion code, 1694 * so we won't panic, but we will notify the user in case something really 1695 * broke. 1696 */ 1697 1698 /* sti();*/ 1699 wd33c93_execute(instance); 1700 1701 enable_irq(cmd->device->host->irq); 1702 printk("scsi%d: warning : SCSI command probably completed successfully" 1703 " before abortion. ", instance->host_no); 1704 return FAILED; 1705 } 1706 1707 #define MAX_WD33C93_HOSTS 4 1708 #define MAX_SETUP_ARGS ARRAY_SIZE(setup_args) 1709 #define SETUP_BUFFER_SIZE 200 1710 static char setup_buffer[SETUP_BUFFER_SIZE]; 1711 static char setup_used[MAX_SETUP_ARGS]; 1712 static int done_setup = 0; 1713 1714 int 1715 wd33c93_setup(char *str) 1716 { 1717 int i; 1718 char *p1, *p2; 1719 1720 /* The kernel does some processing of the command-line before calling 1721 * this function: If it begins with any decimal or hex number arguments, 1722 * ints[0] = how many numbers found and ints[1] through [n] are the values 1723 * themselves. str points to where the non-numeric arguments (if any) 1724 * start: We do our own parsing of those. We construct synthetic 'nosync' 1725 * keywords out of numeric args (to maintain compatibility with older 1726 * versions) and then add the rest of the arguments. 1727 */ 1728 1729 p1 = setup_buffer; 1730 *p1 = '\0'; 1731 if (str) 1732 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer)); 1733 setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0'; 1734 p1 = setup_buffer; 1735 i = 0; 1736 while (*p1 && (i < MAX_SETUP_ARGS)) { 1737 p2 = strchr(p1, ','); 1738 if (p2) { 1739 *p2 = '\0'; 1740 if (p1 != p2) 1741 setup_args[i] = p1; 1742 p1 = p2 + 1; 1743 i++; 1744 } else { 1745 setup_args[i] = p1; 1746 break; 1747 } 1748 } 1749 for (i = 0; i < MAX_SETUP_ARGS; i++) 1750 setup_used[i] = 0; 1751 done_setup = 1; 1752 1753 return 1; 1754 } 1755 __setup("wd33c93=", wd33c93_setup); 1756 1757 /* check_setup_args() returns index if key found, 0 if not 1758 */ 1759 static int 1760 check_setup_args(char *key, int *flags, int *val, char *buf) 1761 { 1762 int x; 1763 char *cp; 1764 1765 for (x = 0; x < MAX_SETUP_ARGS; x++) { 1766 if (setup_used[x]) 1767 continue; 1768 if (!strncmp(setup_args[x], key, strlen(key))) 1769 break; 1770 if (!strncmp(setup_args[x], "next", strlen("next"))) 1771 return 0; 1772 } 1773 if (x == MAX_SETUP_ARGS) 1774 return 0; 1775 setup_used[x] = 1; 1776 cp = setup_args[x] + strlen(key); 1777 *val = -1; 1778 if (*cp != ':') 1779 return ++x; 1780 cp++; 1781 if ((*cp >= '0') && (*cp <= '9')) { 1782 *val = simple_strtoul(cp, NULL, 0); 1783 } 1784 return ++x; 1785 } 1786 1787 void 1788 wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs, 1789 dma_setup_t setup, dma_stop_t stop, int clock_freq) 1790 { 1791 struct WD33C93_hostdata *hostdata; 1792 int i; 1793 int flags; 1794 int val; 1795 char buf[32]; 1796 1797 if (!done_setup && setup_strings) 1798 wd33c93_setup(setup_strings); 1799 1800 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1801 1802 hostdata->regs = regs; 1803 hostdata->clock_freq = clock_freq; 1804 hostdata->dma_setup = setup; 1805 hostdata->dma_stop = stop; 1806 hostdata->dma_bounce_buffer = NULL; 1807 hostdata->dma_bounce_len = 0; 1808 for (i = 0; i < 8; i++) { 1809 hostdata->busy[i] = 0; 1810 hostdata->sync_xfer[i] = 1811 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF); 1812 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ 1813 #ifdef PROC_STATISTICS 1814 hostdata->cmd_cnt[i] = 0; 1815 hostdata->disc_allowed_cnt[i] = 0; 1816 hostdata->disc_done_cnt[i] = 0; 1817 #endif 1818 } 1819 hostdata->input_Q = NULL; 1820 hostdata->selecting = NULL; 1821 hostdata->connected = NULL; 1822 hostdata->disconnected_Q = NULL; 1823 hostdata->state = S_UNCONNECTED; 1824 hostdata->dma = D_DMA_OFF; 1825 hostdata->level2 = L2_BASIC; 1826 hostdata->disconnect = DIS_ADAPTIVE; 1827 hostdata->args = DEBUG_DEFAULTS; 1828 hostdata->incoming_ptr = 0; 1829 hostdata->outgoing_len = 0; 1830 hostdata->default_sx_per = DEFAULT_SX_PER; 1831 hostdata->no_sync = 0xff; /* sync defaults to off */ 1832 hostdata->no_dma = 0; /* default is DMA enabled */ 1833 1834 #ifdef PROC_INTERFACE 1835 hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS | 1836 PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP; 1837 #ifdef PROC_STATISTICS 1838 hostdata->dma_cnt = 0; 1839 hostdata->pio_cnt = 0; 1840 hostdata->int_cnt = 0; 1841 #endif 1842 #endif 1843 1844 if (check_setup_args("nosync", &flags, &val, buf)) 1845 hostdata->no_sync = val; 1846 1847 if (check_setup_args("nodma", &flags, &val, buf)) 1848 hostdata->no_dma = (val == -1) ? 1 : val; 1849 1850 if (check_setup_args("period", &flags, &val, buf)) 1851 hostdata->default_sx_per = 1852 sx_table[round_period((unsigned int) val)].period_ns; 1853 1854 if (check_setup_args("disconnect", &flags, &val, buf)) { 1855 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS)) 1856 hostdata->disconnect = val; 1857 else 1858 hostdata->disconnect = DIS_ADAPTIVE; 1859 } 1860 1861 if (check_setup_args("level2", &flags, &val, buf)) 1862 hostdata->level2 = val; 1863 1864 if (check_setup_args("debug", &flags, &val, buf)) 1865 hostdata->args = val & DB_MASK; 1866 1867 if (check_setup_args("clock", &flags, &val, buf)) { 1868 if (val > 7 && val < 11) 1869 val = WD33C93_FS_8_10; 1870 else if (val > 11 && val < 16) 1871 val = WD33C93_FS_12_15; 1872 else if (val > 15 && val < 21) 1873 val = WD33C93_FS_16_20; 1874 else 1875 val = WD33C93_FS_8_10; 1876 hostdata->clock_freq = val; 1877 } 1878 1879 if ((i = check_setup_args("next", &flags, &val, buf))) { 1880 while (i) 1881 setup_used[--i] = 1; 1882 } 1883 #ifdef PROC_INTERFACE 1884 if (check_setup_args("proc", &flags, &val, buf)) 1885 hostdata->proc = val; 1886 #endif 1887 1888 spin_lock_irq(&hostdata->lock); 1889 reset_wd33c93(instance); 1890 spin_unlock_irq(&hostdata->lock); 1891 1892 printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d", 1893 instance->host_no, 1894 (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip == 1895 C_WD33C93A) ? 1896 "WD33c93A" : (hostdata->chip == 1897 C_WD33C93B) ? "WD33c93B" : "unknown", 1898 hostdata->microcode, hostdata->no_sync, hostdata->no_dma); 1899 #ifdef DEBUGGING_ON 1900 printk(" debug_flags=0x%02x\n", hostdata->args); 1901 #else 1902 printk(" debugging=OFF\n"); 1903 #endif 1904 printk(" setup_args="); 1905 for (i = 0; i < MAX_SETUP_ARGS; i++) 1906 printk("%s,", setup_args[i]); 1907 printk("\n"); 1908 printk(" Version %s - %s, Compiled %s at %s\n", 1909 WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__); 1910 } 1911 1912 int 1913 wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in) 1914 { 1915 1916 #ifdef PROC_INTERFACE 1917 1918 char *bp; 1919 char tbuf[128]; 1920 struct WD33C93_hostdata *hd; 1921 struct scsi_cmnd *cmd; 1922 int x, i; 1923 static int stop = 0; 1924 1925 hd = (struct WD33C93_hostdata *) instance->hostdata; 1926 1927 /* If 'in' is TRUE we need to _read_ the proc file. We accept the following 1928 * keywords (same format as command-line, but only ONE per read): 1929 * debug 1930 * disconnect 1931 * period 1932 * resync 1933 * proc 1934 * nodma 1935 */ 1936 1937 if (in) { 1938 buf[len] = '\0'; 1939 bp = buf; 1940 if (!strncmp(bp, "debug:", 6)) { 1941 bp += 6; 1942 hd->args = simple_strtoul(bp, NULL, 0) & DB_MASK; 1943 } else if (!strncmp(bp, "disconnect:", 11)) { 1944 bp += 11; 1945 x = simple_strtoul(bp, NULL, 0); 1946 if (x < DIS_NEVER || x > DIS_ALWAYS) 1947 x = DIS_ADAPTIVE; 1948 hd->disconnect = x; 1949 } else if (!strncmp(bp, "period:", 7)) { 1950 bp += 7; 1951 x = simple_strtoul(bp, NULL, 0); 1952 hd->default_sx_per = 1953 sx_table[round_period((unsigned int) x)].period_ns; 1954 } else if (!strncmp(bp, "resync:", 7)) { 1955 bp += 7; 1956 x = simple_strtoul(bp, NULL, 0); 1957 for (i = 0; i < 7; i++) 1958 if (x & (1 << i)) 1959 hd->sync_stat[i] = SS_UNSET; 1960 } else if (!strncmp(bp, "proc:", 5)) { 1961 bp += 5; 1962 hd->proc = simple_strtoul(bp, NULL, 0); 1963 } else if (!strncmp(bp, "nodma:", 6)) { 1964 bp += 6; 1965 hd->no_dma = simple_strtoul(bp, NULL, 0); 1966 } else if (!strncmp(bp, "level2:", 7)) { 1967 bp += 7; 1968 hd->level2 = simple_strtoul(bp, NULL, 0); 1969 } 1970 return len; 1971 } 1972 1973 spin_lock_irq(&hd->lock); 1974 bp = buf; 1975 *bp = '\0'; 1976 if (hd->proc & PR_VERSION) { 1977 sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s", 1978 WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__); 1979 strcat(bp, tbuf); 1980 } 1981 if (hd->proc & PR_INFO) { 1982 sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d", 1983 hd->clock_freq, hd->no_sync, hd->no_dma); 1984 strcat(bp, tbuf); 1985 strcat(bp, "\nsync_xfer[] = "); 1986 for (x = 0; x < 7; x++) { 1987 sprintf(tbuf, "\t%02x", hd->sync_xfer[x]); 1988 strcat(bp, tbuf); 1989 } 1990 strcat(bp, "\nsync_stat[] = "); 1991 for (x = 0; x < 7; x++) { 1992 sprintf(tbuf, "\t%02x", hd->sync_stat[x]); 1993 strcat(bp, tbuf); 1994 } 1995 } 1996 #ifdef PROC_STATISTICS 1997 if (hd->proc & PR_STATISTICS) { 1998 strcat(bp, "\ncommands issued: "); 1999 for (x = 0; x < 7; x++) { 2000 sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]); 2001 strcat(bp, tbuf); 2002 } 2003 strcat(bp, "\ndisconnects allowed:"); 2004 for (x = 0; x < 7; x++) { 2005 sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]); 2006 strcat(bp, tbuf); 2007 } 2008 strcat(bp, "\ndisconnects done: "); 2009 for (x = 0; x < 7; x++) { 2010 sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]); 2011 strcat(bp, tbuf); 2012 } 2013 sprintf(tbuf, 2014 "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO", 2015 hd->int_cnt, hd->dma_cnt, hd->pio_cnt); 2016 strcat(bp, tbuf); 2017 } 2018 #endif 2019 if (hd->proc & PR_CONNECTED) { 2020 strcat(bp, "\nconnected: "); 2021 if (hd->connected) { 2022 cmd = (struct scsi_cmnd *) hd->connected; 2023 sprintf(tbuf, " %ld-%d:%d(%02x)", 2024 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2025 strcat(bp, tbuf); 2026 } 2027 } 2028 if (hd->proc & PR_INPUTQ) { 2029 strcat(bp, "\ninput_Q: "); 2030 cmd = (struct scsi_cmnd *) hd->input_Q; 2031 while (cmd) { 2032 sprintf(tbuf, " %ld-%d:%d(%02x)", 2033 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2034 strcat(bp, tbuf); 2035 cmd = (struct scsi_cmnd *) cmd->host_scribble; 2036 } 2037 } 2038 if (hd->proc & PR_DISCQ) { 2039 strcat(bp, "\ndisconnected_Q:"); 2040 cmd = (struct scsi_cmnd *) hd->disconnected_Q; 2041 while (cmd) { 2042 sprintf(tbuf, " %ld-%d:%d(%02x)", 2043 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2044 strcat(bp, tbuf); 2045 cmd = (struct scsi_cmnd *) cmd->host_scribble; 2046 } 2047 } 2048 strcat(bp, "\n"); 2049 spin_unlock_irq(&hd->lock); 2050 *start = buf; 2051 if (stop) { 2052 stop = 0; 2053 return 0; 2054 } 2055 if (off > 0x40000) /* ALWAYS stop after 256k bytes have been read */ 2056 stop = 1; 2057 if (hd->proc & PR_STOP) /* stop every other time */ 2058 stop = 1; 2059 return strlen(bp); 2060 2061 #else /* PROC_INTERFACE */ 2062 2063 return 0; 2064 2065 #endif /* PROC_INTERFACE */ 2066 2067 } 2068 2069 void 2070 wd33c93_release(void) 2071 { 2072 } 2073 2074 EXPORT_SYMBOL(wd33c93_host_reset); 2075 EXPORT_SYMBOL(wd33c93_init); 2076 EXPORT_SYMBOL(wd33c93_release); 2077 EXPORT_SYMBOL(wd33c93_abort); 2078 EXPORT_SYMBOL(wd33c93_queuecommand); 2079 EXPORT_SYMBOL(wd33c93_intr); 2080 EXPORT_SYMBOL(wd33c93_proc_info); 2081