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 * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of 74 * default_sx_per for asynchronous data transfers. Added adjustment 75 * of transfer periods in sx_table to the actual input-clock. 76 * peter fuerst <post@pfrst.de> February 2007 77 */ 78 79#include <linux/module.h> 80 81#include <linux/string.h> 82#include <linux/delay.h> 83#include <linux/init.h> 84#include <linux/interrupt.h> 85#include <linux/blkdev.h> 86 87#include <scsi/scsi.h> 88#include <scsi/scsi_cmnd.h> 89#include <scsi/scsi_device.h> 90#include <scsi/scsi_host.h> 91 92#include "wd33c93.h" 93 94#define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns 95 96 97#define WD33C93_VERSION "1.26++" 98#define WD33C93_DATE "10/Feb/2007" 99 100MODULE_AUTHOR("John Shifflett"); 101MODULE_DESCRIPTION("Generic WD33C93 SCSI driver"); 102MODULE_LICENSE("GPL"); 103 104/* 105 * 'setup_strings' is a single string used to pass operating parameters and 106 * settings from the kernel/module command-line to the driver. 'setup_args[]' 107 * is an array of strings that define the compile-time default values for 108 * these settings. If Linux boots with an amiboot or insmod command-line, 109 * those settings are combined with 'setup_args[]'. Note that amiboot 110 * command-lines are prefixed with "wd33c93=" while insmod uses a 111 * "setup_strings=" prefix. The driver recognizes the following keywords 112 * (lower case required) and arguments: 113 * 114 * - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with 115 * the 7 possible SCSI devices. Set a bit to negotiate for 116 * asynchronous transfers on that device. To maintain 117 * backwards compatibility, a command-line such as 118 * "wd33c93=255" will be automatically translated to 119 * "wd33c93=nosync:0xff". 120 * - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is 121 * optional - if not present, same as "nodma:1". 122 * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer 123 * period. Default is 500; acceptable values are 250 - 1000. 124 * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them. 125 * x = 1 does 'adaptive' disconnects, which is the default 126 * and generally the best choice. 127 * - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes 128 * various types of debug output to printed - see the DB_xxx 129 * defines in wd33c93.h 130 * - clock:x -x = clock input in MHz for WD33c93 chip. Normal values 131 * would be from 8 through 20. Default is 8. 132 * - burst:x -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use 133 * Single Byte DMA, which is the default. Argument is 134 * optional - if not present, same as "burst:1". 135 * - fast:x -x = 1 to enable Fast SCSI, which is only effective with 136 * input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable 137 * it, which is the default. Argument is optional - if not 138 * present, same as "fast:1". 139 * - next -No argument. Used to separate blocks of keywords when 140 * there's more than one host adapter in the system. 141 * 142 * Syntax Notes: 143 * - Numeric arguments can be decimal or the '0x' form of hex notation. There 144 * _must_ be a colon between a keyword and its numeric argument, with no 145 * spaces. 146 * - Keywords are separated by commas, no spaces, in the standard kernel 147 * command-line manner. 148 * - A keyword in the 'nth' comma-separated command-line member will overwrite 149 * the 'nth' element of setup_args[]. A blank command-line member (in 150 * other words, a comma with no preceding keyword) will _not_ overwrite 151 * the corresponding setup_args[] element. 152 * - If a keyword is used more than once, the first one applies to the first 153 * SCSI host found, the second to the second card, etc, unless the 'next' 154 * keyword is used to change the order. 155 * 156 * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'): 157 * - wd33c93=nosync:255 158 * - wd33c93=nodma 159 * - wd33c93=nodma:1 160 * - wd33c93=disconnect:2,nosync:0x08,period:250 161 * - wd33c93=debug:0x1c 162 */ 163 164/* Normally, no defaults are specified */ 165static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" }; 166 167static char *setup_strings; 168module_param(setup_strings, charp, 0); 169 170static void wd33c93_execute(struct Scsi_Host *instance); 171 172#ifdef CONFIG_WD33C93_PIO 173static inline uchar 174read_wd33c93(const wd33c93_regs regs, uchar reg_num) 175{ 176 uchar data; 177 178 outb(reg_num, regs.SASR); 179 data = inb(regs.SCMD); 180 return data; 181} 182 183static inline unsigned long 184read_wd33c93_count(const wd33c93_regs regs) 185{ 186 unsigned long value; 187 188 outb(WD_TRANSFER_COUNT_MSB, regs.SASR); 189 value = inb(regs.SCMD) << 16; 190 value |= inb(regs.SCMD) << 8; 191 value |= inb(regs.SCMD); 192 return value; 193} 194 195static inline uchar 196read_aux_stat(const wd33c93_regs regs) 197{ 198 return inb(regs.SASR); 199} 200 201static inline void 202write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) 203{ 204 outb(reg_num, regs.SASR); 205 outb(value, regs.SCMD); 206} 207 208static inline void 209write_wd33c93_count(const wd33c93_regs regs, unsigned long value) 210{ 211 outb(WD_TRANSFER_COUNT_MSB, regs.SASR); 212 outb((value >> 16) & 0xff, regs.SCMD); 213 outb((value >> 8) & 0xff, regs.SCMD); 214 outb( value & 0xff, regs.SCMD); 215} 216 217#define write_wd33c93_cmd(regs, cmd) \ 218 write_wd33c93((regs), WD_COMMAND, (cmd)) 219 220static inline void 221write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) 222{ 223 int i; 224 225 outb(WD_CDB_1, regs.SASR); 226 for (i=0; i<len; i++) 227 outb(cmnd[i], regs.SCMD); 228} 229 230#else /* CONFIG_WD33C93_PIO */ 231static inline uchar 232read_wd33c93(const wd33c93_regs regs, uchar reg_num) 233{ 234 *regs.SASR = reg_num; 235 mb(); 236 return (*regs.SCMD); 237} 238 239static unsigned long 240read_wd33c93_count(const wd33c93_regs regs) 241{ 242 unsigned long value; 243 244 *regs.SASR = WD_TRANSFER_COUNT_MSB; 245 mb(); 246 value = *regs.SCMD << 16; 247 value |= *regs.SCMD << 8; 248 value |= *regs.SCMD; 249 mb(); 250 return value; 251} 252 253static inline uchar 254read_aux_stat(const wd33c93_regs regs) 255{ 256 return *regs.SASR; 257} 258 259static inline void 260write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) 261{ 262 *regs.SASR = reg_num; 263 mb(); 264 *regs.SCMD = value; 265 mb(); 266} 267 268static void 269write_wd33c93_count(const wd33c93_regs regs, unsigned long value) 270{ 271 *regs.SASR = WD_TRANSFER_COUNT_MSB; 272 mb(); 273 *regs.SCMD = value >> 16; 274 *regs.SCMD = value >> 8; 275 *regs.SCMD = value; 276 mb(); 277} 278 279static inline void 280write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd) 281{ 282 *regs.SASR = WD_COMMAND; 283 mb(); 284 *regs.SCMD = cmd; 285 mb(); 286} 287 288static inline void 289write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) 290{ 291 int i; 292 293 *regs.SASR = WD_CDB_1; 294 for (i = 0; i < len; i++) 295 *regs.SCMD = cmnd[i]; 296} 297#endif /* CONFIG_WD33C93_PIO */ 298 299static inline uchar 300read_1_byte(const wd33c93_regs regs) 301{ 302 uchar asr; 303 uchar x = 0; 304 305 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 306 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80); 307 do { 308 asr = read_aux_stat(regs); 309 if (asr & ASR_DBR) 310 x = read_wd33c93(regs, WD_DATA); 311 } while (!(asr & ASR_INT)); 312 return x; 313} 314 315static int 316round_period(unsigned int period, const struct sx_period *sx_table) 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/* 330 * Calculate Synchronous Transfer Register value from SDTR code. 331 */ 332static uchar 333calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast, 334 const struct sx_period *sx_table) 335{ 336 /* When doing Fast SCSI synchronous data transfers, the corresponding 337 * value in 'sx_table' is two times the actually used transfer period. 338 */ 339 uchar result; 340 341 if (offset && fast) { 342 fast = STR_FSS; 343 period *= 2; 344 } else { 345 fast = 0; 346 } 347 period *= 4; /* convert SDTR code to ns */ 348 result = sx_table[round_period(period,sx_table)].reg_value; 349 result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF; 350 result |= fast; 351 return result; 352} 353 354/* 355 * Calculate SDTR code bytes [3],[4] from period and offset. 356 */ 357static inline void 358calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast, 359 uchar msg[2]) 360{ 361 /* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The 362 * actually used transfer period for Fast SCSI synchronous data 363 * transfers is half that value. 364 */ 365 period /= 4; 366 if (offset && fast) 367 period /= 2; 368 msg[0] = period; 369 msg[1] = offset; 370} 371 372int 373wd33c93_queuecommand(struct scsi_cmnd *cmd, 374 void (*done)(struct scsi_cmnd *)) 375{ 376 struct WD33C93_hostdata *hostdata; 377 struct scsi_cmnd *tmp; 378 379 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; 380 381 DB(DB_QUEUE_COMMAND, 382 printk("Q-%d-%02x-%ld( ", cmd->device->id, cmd->cmnd[0], cmd->pid)) 383 384/* Set up a few fields in the scsi_cmnd structure for our own use: 385 * - host_scribble is the pointer to the next cmd in the input queue 386 * - scsi_done points to the routine we call when a cmd is finished 387 * - result is what you'd expect 388 */ 389 cmd->host_scribble = NULL; 390 cmd->scsi_done = done; 391 cmd->result = 0; 392 393 394 if (cmd->use_sg) { 395 cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; 396 cmd->SCp.buffers_residual = cmd->use_sg - 1; 397 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) + 398 cmd->SCp.buffer->offset; 399 cmd->SCp.this_residual = cmd->SCp.buffer->length; 400 } else { 401 cmd->SCp.buffer = NULL; 402 cmd->SCp.buffers_residual = 0; 403 cmd->SCp.ptr = (char *) cmd->request_buffer; 404 cmd->SCp.this_residual = cmd->request_bufflen; 405 } 406 407/* WD docs state that at the conclusion of a "LEVEL2" command, the 408 * status byte can be retrieved from the LUN register. Apparently, 409 * this is the case only for *uninterrupted* LEVEL2 commands! If 410 * there are any unexpected phases entered, even if they are 100% 411 * legal (different devices may choose to do things differently), 412 * the LEVEL2 command sequence is exited. This often occurs prior 413 * to receiving the status byte, in which case the driver does a 414 * status phase interrupt and gets the status byte on its own. 415 * While such a command can then be "resumed" (ie restarted to 416 * finish up as a LEVEL2 command), the LUN register will NOT be 417 * a valid status byte at the command's conclusion, and we must 418 * use the byte obtained during the earlier interrupt. Here, we 419 * preset SCp.Status to an illegal value (0xff) so that when 420 * this command finally completes, we can tell where the actual 421 * status byte is stored. 422 */ 423 424 cmd->SCp.Status = ILLEGAL_STATUS_BYTE; 425 426 /* 427 * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE 428 * commands are added to the head of the queue so that the desired 429 * sense data is not lost before REQUEST_SENSE executes. 430 */ 431 432 spin_lock_irq(&hostdata->lock); 433 434 if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) { 435 cmd->host_scribble = (uchar *) hostdata->input_Q; 436 hostdata->input_Q = cmd; 437 } else { /* find the end of the queue */ 438 for (tmp = (struct scsi_cmnd *) hostdata->input_Q; 439 tmp->host_scribble; 440 tmp = (struct scsi_cmnd *) tmp->host_scribble) ; 441 tmp->host_scribble = (uchar *) cmd; 442 } 443 444/* We know that there's at least one command in 'input_Q' now. 445 * Go see if any of them are runnable! 446 */ 447 448 wd33c93_execute(cmd->device->host); 449 450 DB(DB_QUEUE_COMMAND, printk(")Q-%ld ", cmd->pid)) 451 452 spin_unlock_irq(&hostdata->lock); 453 return 0; 454} 455 456/* 457 * This routine attempts to start a scsi command. If the host_card is 458 * already connected, we give up immediately. Otherwise, look through 459 * the input_Q, using the first command we find that's intended 460 * for a currently non-busy target/lun. 461 * 462 * wd33c93_execute() is always called with interrupts disabled or from 463 * the wd33c93_intr itself, which means that a wd33c93 interrupt 464 * cannot occur while we are in here. 465 */ 466static void 467wd33c93_execute(struct Scsi_Host *instance) 468{ 469 struct WD33C93_hostdata *hostdata = 470 (struct WD33C93_hostdata *) instance->hostdata; 471 const wd33c93_regs regs = hostdata->regs; 472 struct scsi_cmnd *cmd, *prev; 473 474 DB(DB_EXECUTE, printk("EX(")) 475 if (hostdata->selecting || hostdata->connected) { 476 DB(DB_EXECUTE, printk(")EX-0 ")) 477 return; 478 } 479 480 /* 481 * Search through the input_Q for a command destined 482 * for an idle target/lun. 483 */ 484 485 cmd = (struct scsi_cmnd *) hostdata->input_Q; 486 prev = NULL; 487 while (cmd) { 488 if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))) 489 break; 490 prev = cmd; 491 cmd = (struct scsi_cmnd *) cmd->host_scribble; 492 } 493 494 /* quit if queue empty or all possible targets are busy */ 495 496 if (!cmd) { 497 DB(DB_EXECUTE, printk(")EX-1 ")) 498 return; 499 } 500 501 /* remove command from queue */ 502 503 if (prev) 504 prev->host_scribble = cmd->host_scribble; 505 else 506 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble; 507 508#ifdef PROC_STATISTICS 509 hostdata->cmd_cnt[cmd->device->id]++; 510#endif 511 512 /* 513 * Start the selection process 514 */ 515 516 if (cmd->sc_data_direction == DMA_TO_DEVICE) 517 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); 518 else 519 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD); 520 521/* Now we need to figure out whether or not this command is a good 522 * candidate for disconnect/reselect. We guess to the best of our 523 * ability, based on a set of hierarchical rules. When several 524 * devices are operating simultaneously, disconnects are usually 525 * an advantage. In a single device system, or if only 1 device 526 * is being accessed, transfers usually go faster if disconnects 527 * are not allowed: 528 * 529 * + Commands should NEVER disconnect if hostdata->disconnect = 530 * DIS_NEVER (this holds for tape drives also), and ALWAYS 531 * disconnect if hostdata->disconnect = DIS_ALWAYS. 532 * + Tape drive commands should always be allowed to disconnect. 533 * + Disconnect should be allowed if disconnected_Q isn't empty. 534 * + Commands should NOT disconnect if input_Q is empty. 535 * + Disconnect should be allowed if there are commands in input_Q 536 * for a different target/lun. In this case, the other commands 537 * should be made disconnect-able, if not already. 538 * 539 * I know, I know - this code would flunk me out of any 540 * "C Programming 101" class ever offered. But it's easy 541 * to change around and experiment with for now. 542 */ 543 544 cmd->SCp.phase = 0; /* assume no disconnect */ 545 if (hostdata->disconnect == DIS_NEVER) 546 goto no; 547 if (hostdata->disconnect == DIS_ALWAYS) 548 goto yes; 549 if (cmd->device->type == 1) /* tape drive? */ 550 goto yes; 551 if (hostdata->disconnected_Q) /* other commands disconnected? */ 552 goto yes; 553 if (!(hostdata->input_Q)) /* input_Q empty? */ 554 goto no; 555 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; 556 prev = (struct scsi_cmnd *) prev->host_scribble) { 557 if ((prev->device->id != cmd->device->id) || 558 (prev->device->lun != cmd->device->lun)) { 559 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; 560 prev = (struct scsi_cmnd *) prev->host_scribble) 561 prev->SCp.phase = 1; 562 goto yes; 563 } 564 } 565 566 goto no; 567 568 yes: 569 cmd->SCp.phase = 1; 570 571#ifdef PROC_STATISTICS 572 hostdata->disc_allowed_cnt[cmd->device->id]++; 573#endif 574 575 no: 576 577 write_wd33c93(regs, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0)); 578 579 write_wd33c93(regs, WD_TARGET_LUN, cmd->device->lun); 580 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 581 hostdata->sync_xfer[cmd->device->id]); 582 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); 583 584 if ((hostdata->level2 == L2_NONE) || 585 (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) { 586 587 /* 588 * Do a 'Select-With-ATN' command. This will end with 589 * one of the following interrupts: 590 * CSR_RESEL_AM: failure - can try again later. 591 * CSR_TIMEOUT: failure - give up. 592 * CSR_SELECT: success - proceed. 593 */ 594 595 hostdata->selecting = cmd; 596 597/* Every target has its own synchronous transfer setting, kept in the 598 * sync_xfer array, and a corresponding status byte in sync_stat[]. 599 * Each target's sync_stat[] entry is initialized to SX_UNSET, and its 600 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET 601 * means that the parameters are undetermined as yet, and that we 602 * need to send an SDTR message to this device after selection is 603 * complete: We set SS_FIRST to tell the interrupt routine to do so. 604 * If we've been asked not to try synchronous transfers on this 605 * target (and _all_ luns within it), we'll still send the SDTR message 606 * later, but at that time we'll negotiate for async by specifying a 607 * sync fifo depth of 0. 608 */ 609 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET) 610 hostdata->sync_stat[cmd->device->id] = SS_FIRST; 611 hostdata->state = S_SELECTING; 612 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 613 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN); 614 } else { 615 616 /* 617 * Do a 'Select-With-ATN-Xfer' command. This will end with 618 * one of the following interrupts: 619 * CSR_RESEL_AM: failure - can try again later. 620 * CSR_TIMEOUT: failure - give up. 621 * anything else: success - proceed. 622 */ 623 624 hostdata->connected = cmd; 625 write_wd33c93(regs, WD_COMMAND_PHASE, 0); 626 627 /* copy command_descriptor_block into WD chip 628 * (take advantage of auto-incrementing) 629 */ 630 631 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd); 632 633 /* The wd33c93 only knows about Group 0, 1, and 5 commands when 634 * it's doing a 'select-and-transfer'. To be safe, we write the 635 * size of the CDB into the OWN_ID register for every case. This 636 * way there won't be problems with vendor-unique, audio, etc. 637 */ 638 639 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len); 640 641 /* When doing a non-disconnect command with DMA, we can save 642 * ourselves a DATA phase interrupt later by setting everything 643 * up ahead of time. 644 */ 645 646 if ((cmd->SCp.phase == 0) && (hostdata->no_dma == 0)) { 647 if (hostdata->dma_setup(cmd, 648 (cmd->sc_data_direction == DMA_TO_DEVICE) ? 649 DATA_OUT_DIR : DATA_IN_DIR)) 650 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 651 else { 652 write_wd33c93_count(regs, 653 cmd->SCp.this_residual); 654 write_wd33c93(regs, WD_CONTROL, 655 CTRL_IDI | CTRL_EDI | hostdata->dma_mode); 656 hostdata->dma = D_DMA_RUNNING; 657 } 658 } else 659 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 660 661 hostdata->state = S_RUNNING_LEVEL2; 662 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 663 } 664 665 /* 666 * Since the SCSI bus can handle only 1 connection at a time, 667 * we get out of here now. If the selection fails, or when 668 * the command disconnects, we'll come back to this routine 669 * to search the input_Q again... 670 */ 671 672 DB(DB_EXECUTE, 673 printk("%s%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid)) 674} 675 676static void 677transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt, 678 int data_in_dir, struct WD33C93_hostdata *hostdata) 679{ 680 uchar asr; 681 682 DB(DB_TRANSFER, 683 printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out")) 684 685 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 686 write_wd33c93_count(regs, cnt); 687 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); 688 if (data_in_dir) { 689 do { 690 asr = read_aux_stat(regs); 691 if (asr & ASR_DBR) 692 *buf++ = read_wd33c93(regs, WD_DATA); 693 } while (!(asr & ASR_INT)); 694 } else { 695 do { 696 asr = read_aux_stat(regs); 697 if (asr & ASR_DBR) 698 write_wd33c93(regs, WD_DATA, *buf++); 699 } while (!(asr & ASR_INT)); 700 } 701 702 /* Note: we are returning with the interrupt UN-cleared. 703 * Since (presumably) an entire I/O operation has 704 * completed, the bus phase is probably different, and 705 * the interrupt routine will discover this when it 706 * responds to the uncleared int. 707 */ 708 709} 710 711static void 712transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd, 713 int data_in_dir) 714{ 715 struct WD33C93_hostdata *hostdata; 716 unsigned long length; 717 718 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; 719 720/* Normally, you'd expect 'this_residual' to be non-zero here. 721 * In a series of scatter-gather transfers, however, this 722 * routine will usually be called with 'this_residual' equal 723 * to 0 and 'buffers_residual' non-zero. This means that a 724 * previous transfer completed, clearing 'this_residual', and 725 * now we need to setup the next scatter-gather buffer as the 726 * source or destination for THIS transfer. 727 */ 728 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { 729 ++cmd->SCp.buffer; 730 --cmd->SCp.buffers_residual; 731 cmd->SCp.this_residual = cmd->SCp.buffer->length; 732 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) + 733 cmd->SCp.buffer->offset; 734 } 735 if (!cmd->SCp.this_residual) /* avoid bogus setups */ 736 return; 737 738 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 739 hostdata->sync_xfer[cmd->device->id]); 740 741/* 'hostdata->no_dma' is TRUE if we don't even want to try DMA. 742 * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns. 743 */ 744 745 if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) { 746#ifdef PROC_STATISTICS 747 hostdata->pio_cnt++; 748#endif 749 transfer_pio(regs, (uchar *) cmd->SCp.ptr, 750 cmd->SCp.this_residual, data_in_dir, hostdata); 751 length = cmd->SCp.this_residual; 752 cmd->SCp.this_residual = read_wd33c93_count(regs); 753 cmd->SCp.ptr += (length - cmd->SCp.this_residual); 754 } 755 756/* We are able to do DMA (in fact, the Amiga hardware is 757 * already going!), so start up the wd33c93 in DMA mode. 758 * We set 'hostdata->dma' = D_DMA_RUNNING so that when the 759 * transfer completes and causes an interrupt, we're 760 * reminded to tell the Amiga to shut down its end. We'll 761 * postpone the updating of 'this_residual' and 'ptr' 762 * until then. 763 */ 764 765 else { 766#ifdef PROC_STATISTICS 767 hostdata->dma_cnt++; 768#endif 769 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode); 770 write_wd33c93_count(regs, cmd->SCp.this_residual); 771 772 if ((hostdata->level2 >= L2_DATA) || 773 (hostdata->level2 == L2_BASIC && cmd->SCp.phase == 0)) { 774 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 775 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 776 hostdata->state = S_RUNNING_LEVEL2; 777 } else 778 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); 779 780 hostdata->dma = D_DMA_RUNNING; 781 } 782} 783 784void 785wd33c93_intr(struct Scsi_Host *instance) 786{ 787 struct WD33C93_hostdata *hostdata = 788 (struct WD33C93_hostdata *) instance->hostdata; 789 const wd33c93_regs regs = hostdata->regs; 790 struct scsi_cmnd *patch, *cmd; 791 uchar asr, sr, phs, id, lun, *ucp, msg; 792 unsigned long length, flags; 793 794 asr = read_aux_stat(regs); 795 if (!(asr & ASR_INT) || (asr & ASR_BSY)) 796 return; 797 798 spin_lock_irqsave(&hostdata->lock, flags); 799 800#ifdef PROC_STATISTICS 801 hostdata->int_cnt++; 802#endif 803 804 cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */ 805 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */ 806 phs = read_wd33c93(regs, WD_COMMAND_PHASE); 807 808 DB(DB_INTR, printk("{%02x:%02x-", asr, sr)) 809 810/* After starting a DMA transfer, the next interrupt 811 * is guaranteed to be in response to completion of 812 * the transfer. Since the Amiga DMA hardware runs in 813 * in an open-ended fashion, it needs to be told when 814 * to stop; do that here if D_DMA_RUNNING is true. 815 * Also, we have to update 'this_residual' and 'ptr' 816 * based on the contents of the TRANSFER_COUNT register, 817 * in case the device decided to do an intermediate 818 * disconnect (a device may do this if it has to do a 819 * seek, or just to be nice and let other devices have 820 * some bus time during long transfers). After doing 821 * whatever is needed, we go on and service the WD3393 822 * interrupt normally. 823 */ 824 if (hostdata->dma == D_DMA_RUNNING) { 825 DB(DB_TRANSFER, 826 printk("[%p/%d:", cmd->SCp.ptr, cmd->SCp.this_residual)) 827 hostdata->dma_stop(cmd->device->host, cmd, 1); 828 hostdata->dma = D_DMA_OFF; 829 length = cmd->SCp.this_residual; 830 cmd->SCp.this_residual = read_wd33c93_count(regs); 831 cmd->SCp.ptr += (length - cmd->SCp.this_residual); 832 DB(DB_TRANSFER, 833 printk("%p/%d]", cmd->SCp.ptr, cmd->SCp.this_residual)) 834 } 835 836/* Respond to the specific WD3393 interrupt - there are quite a few! */ 837 switch (sr) { 838 case CSR_TIMEOUT: 839 DB(DB_INTR, printk("TIMEOUT")) 840 841 if (hostdata->state == S_RUNNING_LEVEL2) 842 hostdata->connected = NULL; 843 else { 844 cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */ 845 hostdata->selecting = NULL; 846 } 847 848 cmd->result = DID_NO_CONNECT << 16; 849 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 850 hostdata->state = S_UNCONNECTED; 851 cmd->scsi_done(cmd); 852 853 /* From esp.c: 854 * There is a window of time within the scsi_done() path 855 * of execution where interrupts are turned back on full 856 * blast and left that way. During that time we could 857 * reconnect to a disconnected command, then we'd bomb 858 * out below. We could also end up executing two commands 859 * at _once_. ...just so you know why the restore_flags() 860 * is here... 861 */ 862 863 spin_unlock_irqrestore(&hostdata->lock, flags); 864 865/* We are not connected to a target - check to see if there 866 * are commands waiting to be executed. 867 */ 868 869 wd33c93_execute(instance); 870 break; 871 872/* Note: this interrupt should not occur in a LEVEL2 command */ 873 874 case CSR_SELECT: 875 DB(DB_INTR, printk("SELECT")) 876 hostdata->connected = cmd = 877 (struct scsi_cmnd *) hostdata->selecting; 878 hostdata->selecting = NULL; 879 880 /* construct an IDENTIFY message with correct disconnect bit */ 881 882 hostdata->outgoing_msg[0] = (0x80 | 0x00 | cmd->device->lun); 883 if (cmd->SCp.phase) 884 hostdata->outgoing_msg[0] |= 0x40; 885 886 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) { 887 888 hostdata->sync_stat[cmd->device->id] = SS_WAITING; 889 890/* Tack on a 2nd message to ask about synchronous transfers. If we've 891 * been asked to do only asynchronous transfers on this device, we 892 * request a fifo depth of 0, which is equivalent to async - should 893 * solve the problems some people have had with GVP's Guru ROM. 894 */ 895 896 hostdata->outgoing_msg[1] = EXTENDED_MESSAGE; 897 hostdata->outgoing_msg[2] = 3; 898 hostdata->outgoing_msg[3] = EXTENDED_SDTR; 899 if (hostdata->no_sync & (1 << cmd->device->id)) { 900 calc_sync_msg(hostdata->default_sx_per, 0, 901 0, hostdata->outgoing_msg + 4); 902 } else { 903 calc_sync_msg(optimum_sx_per(hostdata), 904 OPTIMUM_SX_OFF, 905 hostdata->fast, 906 hostdata->outgoing_msg + 4); 907 } 908 hostdata->outgoing_len = 6; 909#ifdef SYNC_DEBUG 910 ucp = hostdata->outgoing_msg + 1; 911 printk(" sending SDTR %02x03%02x%02x%02x ", 912 ucp[0], ucp[2], ucp[3], ucp[4]); 913#endif 914 } else 915 hostdata->outgoing_len = 1; 916 917 hostdata->state = S_CONNECTED; 918 spin_unlock_irqrestore(&hostdata->lock, flags); 919 break; 920 921 case CSR_XFER_DONE | PHS_DATA_IN: 922 case CSR_UNEXP | PHS_DATA_IN: 923 case CSR_SRV_REQ | PHS_DATA_IN: 924 DB(DB_INTR, 925 printk("IN-%d.%d", cmd->SCp.this_residual, 926 cmd->SCp.buffers_residual)) 927 transfer_bytes(regs, cmd, DATA_IN_DIR); 928 if (hostdata->state != S_RUNNING_LEVEL2) 929 hostdata->state = S_CONNECTED; 930 spin_unlock_irqrestore(&hostdata->lock, flags); 931 break; 932 933 case CSR_XFER_DONE | PHS_DATA_OUT: 934 case CSR_UNEXP | PHS_DATA_OUT: 935 case CSR_SRV_REQ | PHS_DATA_OUT: 936 DB(DB_INTR, 937 printk("OUT-%d.%d", cmd->SCp.this_residual, 938 cmd->SCp.buffers_residual)) 939 transfer_bytes(regs, cmd, DATA_OUT_DIR); 940 if (hostdata->state != S_RUNNING_LEVEL2) 941 hostdata->state = S_CONNECTED; 942 spin_unlock_irqrestore(&hostdata->lock, flags); 943 break; 944 945/* Note: this interrupt should not occur in a LEVEL2 command */ 946 947 case CSR_XFER_DONE | PHS_COMMAND: 948 case CSR_UNEXP | PHS_COMMAND: 949 case CSR_SRV_REQ | PHS_COMMAND: 950 DB(DB_INTR, printk("CMND-%02x,%ld", cmd->cmnd[0], cmd->pid)) 951 transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, 952 hostdata); 953 hostdata->state = S_CONNECTED; 954 spin_unlock_irqrestore(&hostdata->lock, flags); 955 break; 956 957 case CSR_XFER_DONE | PHS_STATUS: 958 case CSR_UNEXP | PHS_STATUS: 959 case CSR_SRV_REQ | PHS_STATUS: 960 DB(DB_INTR, printk("STATUS=")) 961 cmd->SCp.Status = read_1_byte(regs); 962 DB(DB_INTR, printk("%02x", cmd->SCp.Status)) 963 if (hostdata->level2 >= L2_BASIC) { 964 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ 965 udelay(7); 966 hostdata->state = S_RUNNING_LEVEL2; 967 write_wd33c93(regs, WD_COMMAND_PHASE, 0x50); 968 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 969 } else { 970 hostdata->state = S_CONNECTED; 971 } 972 spin_unlock_irqrestore(&hostdata->lock, flags); 973 break; 974 975 case CSR_XFER_DONE | PHS_MESS_IN: 976 case CSR_UNEXP | PHS_MESS_IN: 977 case CSR_SRV_REQ | PHS_MESS_IN: 978 DB(DB_INTR, printk("MSG_IN=")) 979 980 msg = read_1_byte(regs); 981 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ 982 udelay(7); 983 984 hostdata->incoming_msg[hostdata->incoming_ptr] = msg; 985 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE) 986 msg = EXTENDED_MESSAGE; 987 else 988 hostdata->incoming_ptr = 0; 989 990 cmd->SCp.Message = msg; 991 switch (msg) { 992 993 case COMMAND_COMPLETE: 994 DB(DB_INTR, printk("CCMP-%ld", cmd->pid)) 995 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 996 hostdata->state = S_PRE_CMP_DISC; 997 break; 998 999 case SAVE_POINTERS: 1000 DB(DB_INTR, printk("SDP")) 1001 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1002 hostdata->state = S_CONNECTED; 1003 break; 1004 1005 case RESTORE_POINTERS: 1006 DB(DB_INTR, printk("RDP")) 1007 if (hostdata->level2 >= L2_BASIC) { 1008 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 1009 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1010 hostdata->state = S_RUNNING_LEVEL2; 1011 } else { 1012 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1013 hostdata->state = S_CONNECTED; 1014 } 1015 break; 1016 1017 case DISCONNECT: 1018 DB(DB_INTR, printk("DIS")) 1019 cmd->device->disconnect = 1; 1020 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1021 hostdata->state = S_PRE_TMP_DISC; 1022 break; 1023 1024 case MESSAGE_REJECT: 1025 DB(DB_INTR, printk("REJ")) 1026#ifdef SYNC_DEBUG 1027 printk("-REJ-"); 1028#endif 1029 if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) { 1030 hostdata->sync_stat[cmd->device->id] = SS_SET; 1031 /* we want default_sx_per, not DEFAULT_SX_PER */ 1032 hostdata->sync_xfer[cmd->device->id] = 1033 calc_sync_xfer(hostdata->default_sx_per 1034 / 4, 0, 0, hostdata->sx_table); 1035 } 1036 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1037 hostdata->state = S_CONNECTED; 1038 break; 1039 1040 case EXTENDED_MESSAGE: 1041 DB(DB_INTR, printk("EXT")) 1042 1043 ucp = hostdata->incoming_msg; 1044 1045#ifdef SYNC_DEBUG 1046 printk("%02x", ucp[hostdata->incoming_ptr]); 1047#endif 1048 /* Is this the last byte of the extended message? */ 1049 1050 if ((hostdata->incoming_ptr >= 2) && 1051 (hostdata->incoming_ptr == (ucp[1] + 1))) { 1052 1053 switch (ucp[2]) { /* what's the EXTENDED code? */ 1054 case EXTENDED_SDTR: 1055 /* default to default async period */ 1056 id = calc_sync_xfer(hostdata-> 1057 default_sx_per / 4, 0, 1058 0, hostdata->sx_table); 1059 if (hostdata->sync_stat[cmd->device->id] != 1060 SS_WAITING) { 1061 1062/* A device has sent an unsolicited SDTR message; rather than go 1063 * through the effort of decoding it and then figuring out what 1064 * our reply should be, we're just gonna say that we have a 1065 * synchronous fifo depth of 0. This will result in asynchronous 1066 * transfers - not ideal but so much easier. 1067 * Actually, this is OK because it assures us that if we don't 1068 * specifically ask for sync transfers, we won't do any. 1069 */ 1070 1071 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1072 hostdata->outgoing_msg[0] = 1073 EXTENDED_MESSAGE; 1074 hostdata->outgoing_msg[1] = 3; 1075 hostdata->outgoing_msg[2] = 1076 EXTENDED_SDTR; 1077 calc_sync_msg(hostdata-> 1078 default_sx_per, 0, 1079 0, hostdata->outgoing_msg + 3); 1080 hostdata->outgoing_len = 5; 1081 } else { 1082 if (ucp[4]) /* well, sync transfer */ 1083 id = calc_sync_xfer(ucp[3], ucp[4], 1084 hostdata->fast, 1085 hostdata->sx_table); 1086 else if (ucp[3]) /* very unlikely... */ 1087 id = calc_sync_xfer(ucp[3], ucp[4], 1088 0, hostdata->sx_table); 1089 } 1090 hostdata->sync_xfer[cmd->device->id] = id; 1091#ifdef SYNC_DEBUG 1092 printk(" sync_xfer=%02x\n", 1093 hostdata->sync_xfer[cmd->device->id]); 1094#endif 1095 hostdata->sync_stat[cmd->device->id] = 1096 SS_SET; 1097 write_wd33c93_cmd(regs, 1098 WD_CMD_NEGATE_ACK); 1099 hostdata->state = S_CONNECTED; 1100 break; 1101 case EXTENDED_WDTR: 1102 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1103 printk("sending WDTR "); 1104 hostdata->outgoing_msg[0] = 1105 EXTENDED_MESSAGE; 1106 hostdata->outgoing_msg[1] = 2; 1107 hostdata->outgoing_msg[2] = 1108 EXTENDED_WDTR; 1109 hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */ 1110 hostdata->outgoing_len = 4; 1111 write_wd33c93_cmd(regs, 1112 WD_CMD_NEGATE_ACK); 1113 hostdata->state = S_CONNECTED; 1114 break; 1115 default: 1116 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1117 printk 1118 ("Rejecting Unknown Extended Message(%02x). ", 1119 ucp[2]); 1120 hostdata->outgoing_msg[0] = 1121 MESSAGE_REJECT; 1122 hostdata->outgoing_len = 1; 1123 write_wd33c93_cmd(regs, 1124 WD_CMD_NEGATE_ACK); 1125 hostdata->state = S_CONNECTED; 1126 break; 1127 } 1128 hostdata->incoming_ptr = 0; 1129 } 1130 1131 /* We need to read more MESS_IN bytes for the extended message */ 1132 1133 else { 1134 hostdata->incoming_ptr++; 1135 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1136 hostdata->state = S_CONNECTED; 1137 } 1138 break; 1139 1140 default: 1141 printk("Rejecting Unknown Message(%02x) ", msg); 1142 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1143 hostdata->outgoing_msg[0] = MESSAGE_REJECT; 1144 hostdata->outgoing_len = 1; 1145 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1146 hostdata->state = S_CONNECTED; 1147 } 1148 spin_unlock_irqrestore(&hostdata->lock, flags); 1149 break; 1150 1151/* Note: this interrupt will occur only after a LEVEL2 command */ 1152 1153 case CSR_SEL_XFER_DONE: 1154 1155/* Make sure that reselection is enabled at this point - it may 1156 * have been turned off for the command that just completed. 1157 */ 1158 1159 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1160 if (phs == 0x60) { 1161 DB(DB_INTR, printk("SX-DONE-%ld", cmd->pid)) 1162 cmd->SCp.Message = COMMAND_COMPLETE; 1163 lun = read_wd33c93(regs, WD_TARGET_LUN); 1164 DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun)) 1165 hostdata->connected = NULL; 1166 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1167 hostdata->state = S_UNCONNECTED; 1168 if (cmd->SCp.Status == ILLEGAL_STATUS_BYTE) 1169 cmd->SCp.Status = lun; 1170 if (cmd->cmnd[0] == REQUEST_SENSE 1171 && cmd->SCp.Status != GOOD) 1172 cmd->result = 1173 (cmd-> 1174 result & 0x00ffff) | (DID_ERROR << 16); 1175 else 1176 cmd->result = 1177 cmd->SCp.Status | (cmd->SCp.Message << 8); 1178 cmd->scsi_done(cmd); 1179 1180/* We are no longer connected to a target - check to see if 1181 * there are commands waiting to be executed. 1182 */ 1183 spin_unlock_irqrestore(&hostdata->lock, flags); 1184 wd33c93_execute(instance); 1185 } else { 1186 printk 1187 ("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---", 1188 asr, sr, phs, cmd->pid); 1189 spin_unlock_irqrestore(&hostdata->lock, flags); 1190 } 1191 break; 1192 1193/* Note: this interrupt will occur only after a LEVEL2 command */ 1194 1195 case CSR_SDP: 1196 DB(DB_INTR, printk("SDP")) 1197 hostdata->state = S_RUNNING_LEVEL2; 1198 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41); 1199 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1200 spin_unlock_irqrestore(&hostdata->lock, flags); 1201 break; 1202 1203 case CSR_XFER_DONE | PHS_MESS_OUT: 1204 case CSR_UNEXP | PHS_MESS_OUT: 1205 case CSR_SRV_REQ | PHS_MESS_OUT: 1206 DB(DB_INTR, printk("MSG_OUT=")) 1207 1208/* To get here, we've probably requested MESSAGE_OUT and have 1209 * already put the correct bytes in outgoing_msg[] and filled 1210 * in outgoing_len. We simply send them out to the SCSI bus. 1211 * Sometimes we get MESSAGE_OUT phase when we're not expecting 1212 * it - like when our SDTR message is rejected by a target. Some 1213 * targets send the REJECT before receiving all of the extended 1214 * message, and then seem to go back to MESSAGE_OUT for a byte 1215 * or two. Not sure why, or if I'm doing something wrong to 1216 * cause this to happen. Regardless, it seems that sending 1217 * NOP messages in these situations results in no harm and 1218 * makes everyone happy. 1219 */ 1220 if (hostdata->outgoing_len == 0) { 1221 hostdata->outgoing_len = 1; 1222 hostdata->outgoing_msg[0] = NOP; 1223 } 1224 transfer_pio(regs, hostdata->outgoing_msg, 1225 hostdata->outgoing_len, DATA_OUT_DIR, hostdata); 1226 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0])) 1227 hostdata->outgoing_len = 0; 1228 hostdata->state = S_CONNECTED; 1229 spin_unlock_irqrestore(&hostdata->lock, flags); 1230 break; 1231 1232 case CSR_UNEXP_DISC: 1233 1234/* I think I've seen this after a request-sense that was in response 1235 * to an error condition, but not sure. We certainly need to do 1236 * something when we get this interrupt - the question is 'what?'. 1237 * Let's think positively, and assume some command has finished 1238 * in a legal manner (like a command that provokes a request-sense), 1239 * so we treat it as a normal command-complete-disconnect. 1240 */ 1241 1242/* Make sure that reselection is enabled at this point - it may 1243 * have been turned off for the command that just completed. 1244 */ 1245 1246 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1247 if (cmd == NULL) { 1248 printk(" - Already disconnected! "); 1249 hostdata->state = S_UNCONNECTED; 1250 spin_unlock_irqrestore(&hostdata->lock, flags); 1251 return; 1252 } 1253 DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid)) 1254 hostdata->connected = NULL; 1255 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1256 hostdata->state = S_UNCONNECTED; 1257 if (cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD) 1258 cmd->result = 1259 (cmd->result & 0x00ffff) | (DID_ERROR << 16); 1260 else 1261 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 1262 cmd->scsi_done(cmd); 1263 1264/* We are no longer connected to a target - check to see if 1265 * there are commands waiting to be executed. 1266 */ 1267 /* look above for comments on scsi_done() */ 1268 spin_unlock_irqrestore(&hostdata->lock, flags); 1269 wd33c93_execute(instance); 1270 break; 1271 1272 case CSR_DISC: 1273 1274/* Make sure that reselection is enabled at this point - it may 1275 * have been turned off for the command that just completed. 1276 */ 1277 1278 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1279 DB(DB_INTR, printk("DISC-%ld", cmd->pid)) 1280 if (cmd == NULL) { 1281 printk(" - Already disconnected! "); 1282 hostdata->state = S_UNCONNECTED; 1283 } 1284 switch (hostdata->state) { 1285 case S_PRE_CMP_DISC: 1286 hostdata->connected = NULL; 1287 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1288 hostdata->state = S_UNCONNECTED; 1289 DB(DB_INTR, printk(":%d", cmd->SCp.Status)) 1290 if (cmd->cmnd[0] == REQUEST_SENSE 1291 && cmd->SCp.Status != GOOD) 1292 cmd->result = 1293 (cmd-> 1294 result & 0x00ffff) | (DID_ERROR << 16); 1295 else 1296 cmd->result = 1297 cmd->SCp.Status | (cmd->SCp.Message << 8); 1298 cmd->scsi_done(cmd); 1299 break; 1300 case S_PRE_TMP_DISC: 1301 case S_RUNNING_LEVEL2: 1302 cmd->host_scribble = (uchar *) hostdata->disconnected_Q; 1303 hostdata->disconnected_Q = cmd; 1304 hostdata->connected = NULL; 1305 hostdata->state = S_UNCONNECTED; 1306 1307#ifdef PROC_STATISTICS 1308 hostdata->disc_done_cnt[cmd->device->id]++; 1309#endif 1310 1311 break; 1312 default: 1313 printk("*** Unexpected DISCONNECT interrupt! ***"); 1314 hostdata->state = S_UNCONNECTED; 1315 } 1316 1317/* We are no longer connected to a target - check to see if 1318 * there are commands waiting to be executed. 1319 */ 1320 spin_unlock_irqrestore(&hostdata->lock, flags); 1321 wd33c93_execute(instance); 1322 break; 1323 1324 case CSR_RESEL_AM: 1325 case CSR_RESEL: 1326 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : "")) 1327 1328 /* Old chips (pre -A ???) don't have advanced features and will 1329 * generate CSR_RESEL. In that case we have to extract the LUN the 1330 * hard way (see below). 1331 * First we have to make sure this reselection didn't 1332 * happen during Arbitration/Selection of some other device. 1333 * If yes, put losing command back on top of input_Q. 1334 */ 1335 if (hostdata->level2 <= L2_NONE) { 1336 1337 if (hostdata->selecting) { 1338 cmd = (struct scsi_cmnd *) hostdata->selecting; 1339 hostdata->selecting = NULL; 1340 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1341 cmd->host_scribble = 1342 (uchar *) hostdata->input_Q; 1343 hostdata->input_Q = cmd; 1344 } 1345 } 1346 1347 else { 1348 1349 if (cmd) { 1350 if (phs == 0x00) { 1351 hostdata->busy[cmd->device->id] &= 1352 ~(1 << cmd->device->lun); 1353 cmd->host_scribble = 1354 (uchar *) hostdata->input_Q; 1355 hostdata->input_Q = cmd; 1356 } else { 1357 printk 1358 ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---", 1359 asr, sr, phs); 1360 while (1) 1361 printk("\r"); 1362 } 1363 } 1364 1365 } 1366 1367 /* OK - find out which device reselected us. */ 1368 1369 id = read_wd33c93(regs, WD_SOURCE_ID); 1370 id &= SRCID_MASK; 1371 1372 /* and extract the lun from the ID message. (Note that we don't 1373 * bother to check for a valid message here - I guess this is 1374 * not the right way to go, but...) 1375 */ 1376 1377 if (sr == CSR_RESEL_AM) { 1378 lun = read_wd33c93(regs, WD_DATA); 1379 if (hostdata->level2 < L2_RESELECT) 1380 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1381 lun &= 7; 1382 } else { 1383 /* Old chip; wait for msgin phase to pick up the LUN. */ 1384 for (lun = 255; lun; lun--) { 1385 if ((asr = read_aux_stat(regs)) & ASR_INT) 1386 break; 1387 udelay(10); 1388 } 1389 if (!(asr & ASR_INT)) { 1390 printk 1391 ("wd33c93: Reselected without IDENTIFY\n"); 1392 lun = 0; 1393 } else { 1394 /* Verify this is a change to MSG_IN and read the message */ 1395 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1396 udelay(7); 1397 if (sr == (CSR_ABORT | PHS_MESS_IN) || 1398 sr == (CSR_UNEXP | PHS_MESS_IN) || 1399 sr == (CSR_SRV_REQ | PHS_MESS_IN)) { 1400 /* Got MSG_IN, grab target LUN */ 1401 lun = read_1_byte(regs); 1402 /* Now we expect a 'paused with ACK asserted' int.. */ 1403 asr = read_aux_stat(regs); 1404 if (!(asr & ASR_INT)) { 1405 udelay(10); 1406 asr = read_aux_stat(regs); 1407 if (!(asr & ASR_INT)) 1408 printk 1409 ("wd33c93: No int after LUN on RESEL (%02x)\n", 1410 asr); 1411 } 1412 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1413 udelay(7); 1414 if (sr != CSR_MSGIN) 1415 printk 1416 ("wd33c93: Not paused with ACK on RESEL (%02x)\n", 1417 sr); 1418 lun &= 7; 1419 write_wd33c93_cmd(regs, 1420 WD_CMD_NEGATE_ACK); 1421 } else { 1422 printk 1423 ("wd33c93: Not MSG_IN on reselect (%02x)\n", 1424 sr); 1425 lun = 0; 1426 } 1427 } 1428 } 1429 1430 /* Now we look for the command that's reconnecting. */ 1431 1432 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q; 1433 patch = NULL; 1434 while (cmd) { 1435 if (id == cmd->device->id && lun == cmd->device->lun) 1436 break; 1437 patch = cmd; 1438 cmd = (struct scsi_cmnd *) cmd->host_scribble; 1439 } 1440 1441 /* Hmm. Couldn't find a valid command.... What to do? */ 1442 1443 if (!cmd) { 1444 printk 1445 ("---TROUBLE: target %d.%d not in disconnect queue---", 1446 id, lun); 1447 spin_unlock_irqrestore(&hostdata->lock, flags); 1448 return; 1449 } 1450 1451 /* Ok, found the command - now start it up again. */ 1452 1453 if (patch) 1454 patch->host_scribble = cmd->host_scribble; 1455 else 1456 hostdata->disconnected_Q = 1457 (struct scsi_cmnd *) cmd->host_scribble; 1458 hostdata->connected = cmd; 1459 1460 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]' 1461 * because these things are preserved over a disconnect. 1462 * But we DO need to fix the DPD bit so it's correct for this command. 1463 */ 1464 1465 if (cmd->sc_data_direction == DMA_TO_DEVICE) 1466 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); 1467 else 1468 write_wd33c93(regs, WD_DESTINATION_ID, 1469 cmd->device->id | DSTID_DPD); 1470 if (hostdata->level2 >= L2_RESELECT) { 1471 write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */ 1472 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 1473 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1474 hostdata->state = S_RUNNING_LEVEL2; 1475 } else 1476 hostdata->state = S_CONNECTED; 1477 1478 DB(DB_INTR, printk("-%ld", cmd->pid)) 1479 spin_unlock_irqrestore(&hostdata->lock, flags); 1480 break; 1481 1482 default: 1483 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs); 1484 spin_unlock_irqrestore(&hostdata->lock, flags); 1485 } 1486 1487 DB(DB_INTR, printk("} ")) 1488 1489} 1490 1491static void 1492reset_wd33c93(struct Scsi_Host *instance) 1493{ 1494 struct WD33C93_hostdata *hostdata = 1495 (struct WD33C93_hostdata *) instance->hostdata; 1496 const wd33c93_regs regs = hostdata->regs; 1497 uchar sr; 1498 1499#ifdef CONFIG_SGI_IP22 1500 { 1501 int busycount = 0; 1502 extern void sgiwd93_reset(unsigned long); 1503 /* wait 'til the chip gets some time for us */ 1504 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100) 1505 udelay (10); 1506 /* 1507 * there are scsi devices out there, which manage to lock up 1508 * the wd33c93 in a busy condition. In this state it won't 1509 * accept the reset command. The only way to solve this is to 1510 * give the chip a hardware reset (if possible). The code below 1511 * does this for the SGI Indy, where this is possible 1512 */ 1513 /* still busy ? */ 1514 if (read_aux_stat(regs) & ASR_BSY) 1515 sgiwd93_reset(instance->base); /* yeah, give it the hard one */ 1516 } 1517#endif 1518 1519 write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF | 1520 instance->this_id | hostdata->clock_freq); 1521 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1522 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 1523 calc_sync_xfer(hostdata->default_sx_per / 4, 1524 DEFAULT_SX_OFF, 0, hostdata->sx_table)); 1525 write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET); 1526 1527 1528#ifdef CONFIG_MVME147_SCSI 1529 udelay(25); /* The old wd33c93 on MVME147 needs this, at least */ 1530#endif 1531 1532 while (!(read_aux_stat(regs) & ASR_INT)) 1533 ; 1534 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1535 1536 hostdata->microcode = read_wd33c93(regs, WD_CDB_1); 1537 if (sr == 0x00) 1538 hostdata->chip = C_WD33C93; 1539 else if (sr == 0x01) { 1540 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */ 1541 sr = read_wd33c93(regs, WD_QUEUE_TAG); 1542 if (sr == 0xa5) { 1543 hostdata->chip = C_WD33C93B; 1544 write_wd33c93(regs, WD_QUEUE_TAG, 0); 1545 } else 1546 hostdata->chip = C_WD33C93A; 1547 } else 1548 hostdata->chip = C_UNKNOWN_CHIP; 1549 1550 if (hostdata->chip != C_WD33C93B) /* Fast SCSI unavailable */ 1551 hostdata->fast = 0; 1552 1553 write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE); 1554 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1555} 1556 1557int 1558wd33c93_host_reset(struct scsi_cmnd * SCpnt) 1559{ 1560 struct Scsi_Host *instance; 1561 struct WD33C93_hostdata *hostdata; 1562 int i; 1563 1564 instance = SCpnt->device->host; 1565 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1566 1567 printk("scsi%d: reset. ", instance->host_no); 1568 disable_irq(instance->irq); 1569 1570 hostdata->dma_stop(instance, NULL, 0); 1571 for (i = 0; i < 8; i++) { 1572 hostdata->busy[i] = 0; 1573 hostdata->sync_xfer[i] = 1574 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF, 1575 0, hostdata->sx_table); 1576 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ 1577 } 1578 hostdata->input_Q = NULL; 1579 hostdata->selecting = NULL; 1580 hostdata->connected = NULL; 1581 hostdata->disconnected_Q = NULL; 1582 hostdata->state = S_UNCONNECTED; 1583 hostdata->dma = D_DMA_OFF; 1584 hostdata->incoming_ptr = 0; 1585 hostdata->outgoing_len = 0; 1586 1587 reset_wd33c93(instance); 1588 SCpnt->result = DID_RESET << 16; 1589 enable_irq(instance->irq); 1590 return SUCCESS; 1591} 1592 1593int 1594wd33c93_abort(struct scsi_cmnd * cmd) 1595{ 1596 struct Scsi_Host *instance; 1597 struct WD33C93_hostdata *hostdata; 1598 wd33c93_regs regs; 1599 struct scsi_cmnd *tmp, *prev; 1600 1601 disable_irq(cmd->device->host->irq); 1602 1603 instance = cmd->device->host; 1604 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1605 regs = hostdata->regs; 1606 1607/* 1608 * Case 1 : If the command hasn't been issued yet, we simply remove it 1609 * from the input_Q. 1610 */ 1611 1612 tmp = (struct scsi_cmnd *) hostdata->input_Q; 1613 prev = NULL; 1614 while (tmp) { 1615 if (tmp == cmd) { 1616 if (prev) 1617 prev->host_scribble = cmd->host_scribble; 1618 else 1619 hostdata->input_Q = 1620 (struct scsi_cmnd *) cmd->host_scribble; 1621 cmd->host_scribble = NULL; 1622 cmd->result = DID_ABORT << 16; 1623 printk 1624 ("scsi%d: Abort - removing command %ld from input_Q. ", 1625 instance->host_no, cmd->pid); 1626 enable_irq(cmd->device->host->irq); 1627 cmd->scsi_done(cmd); 1628 return SUCCESS; 1629 } 1630 prev = tmp; 1631 tmp = (struct scsi_cmnd *) tmp->host_scribble; 1632 } 1633 1634/* 1635 * Case 2 : If the command is connected, we're going to fail the abort 1636 * and let the high level SCSI driver retry at a later time or 1637 * issue a reset. 1638 * 1639 * Timeouts, and therefore aborted commands, will be highly unlikely 1640 * and handling them cleanly in this situation would make the common 1641 * case of noresets less efficient, and would pollute our code. So, 1642 * we fail. 1643 */ 1644 1645 if (hostdata->connected == cmd) { 1646 uchar sr, asr; 1647 unsigned long timeout; 1648 1649 printk("scsi%d: Aborting connected command %ld - ", 1650 instance->host_no, cmd->pid); 1651 1652 printk("stopping DMA - "); 1653 if (hostdata->dma == D_DMA_RUNNING) { 1654 hostdata->dma_stop(instance, cmd, 0); 1655 hostdata->dma = D_DMA_OFF; 1656 } 1657 1658 printk("sending wd33c93 ABORT command - "); 1659 write_wd33c93(regs, WD_CONTROL, 1660 CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1661 write_wd33c93_cmd(regs, WD_CMD_ABORT); 1662 1663/* Now we have to attempt to flush out the FIFO... */ 1664 1665 printk("flushing fifo - "); 1666 timeout = 1000000; 1667 do { 1668 asr = read_aux_stat(regs); 1669 if (asr & ASR_DBR) 1670 read_wd33c93(regs, WD_DATA); 1671 } while (!(asr & ASR_INT) && timeout-- > 0); 1672 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1673 printk 1674 ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ", 1675 asr, sr, read_wd33c93_count(regs), timeout); 1676 1677 /* 1678 * Abort command processed. 1679 * Still connected. 1680 * We must disconnect. 1681 */ 1682 1683 printk("sending wd33c93 DISCONNECT command - "); 1684 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT); 1685 1686 timeout = 1000000; 1687 asr = read_aux_stat(regs); 1688 while ((asr & ASR_CIP) && timeout-- > 0) 1689 asr = read_aux_stat(regs); 1690 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1691 printk("asr=%02x, sr=%02x.", asr, sr); 1692 1693 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); 1694 hostdata->connected = NULL; 1695 hostdata->state = S_UNCONNECTED; 1696 cmd->result = DID_ABORT << 16; 1697 1698/* sti();*/ 1699 wd33c93_execute(instance); 1700 1701 enable_irq(cmd->device->host->irq); 1702 cmd->scsi_done(cmd); 1703 return SUCCESS; 1704 } 1705 1706/* 1707 * Case 3: If the command is currently disconnected from the bus, 1708 * we're not going to expend much effort here: Let's just return 1709 * an ABORT_SNOOZE and hope for the best... 1710 */ 1711 1712 tmp = (struct scsi_cmnd *) hostdata->disconnected_Q; 1713 while (tmp) { 1714 if (tmp == cmd) { 1715 printk 1716 ("scsi%d: Abort - command %ld found on disconnected_Q - ", 1717 instance->host_no, cmd->pid); 1718 printk("Abort SNOOZE. "); 1719 enable_irq(cmd->device->host->irq); 1720 return FAILED; 1721 } 1722 tmp = (struct scsi_cmnd *) tmp->host_scribble; 1723 } 1724 1725/* 1726 * Case 4 : If we reached this point, the command was not found in any of 1727 * the queues. 1728 * 1729 * We probably reached this point because of an unlikely race condition 1730 * between the command completing successfully and the abortion code, 1731 * so we won't panic, but we will notify the user in case something really 1732 * broke. 1733 */ 1734 1735/* sti();*/ 1736 wd33c93_execute(instance); 1737 1738 enable_irq(cmd->device->host->irq); 1739 printk("scsi%d: warning : SCSI command probably completed successfully" 1740 " before abortion. ", instance->host_no); 1741 return FAILED; 1742} 1743 1744#define MAX_WD33C93_HOSTS 4 1745#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args) 1746#define SETUP_BUFFER_SIZE 200 1747static char setup_buffer[SETUP_BUFFER_SIZE]; 1748static char setup_used[MAX_SETUP_ARGS]; 1749static int done_setup = 0; 1750 1751int 1752wd33c93_setup(char *str) 1753{ 1754 int i; 1755 char *p1, *p2; 1756 1757 /* The kernel does some processing of the command-line before calling 1758 * this function: If it begins with any decimal or hex number arguments, 1759 * ints[0] = how many numbers found and ints[1] through [n] are the values 1760 * themselves. str points to where the non-numeric arguments (if any) 1761 * start: We do our own parsing of those. We construct synthetic 'nosync' 1762 * keywords out of numeric args (to maintain compatibility with older 1763 * versions) and then add the rest of the arguments. 1764 */ 1765 1766 p1 = setup_buffer; 1767 *p1 = '\0'; 1768 if (str) 1769 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer)); 1770 setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0'; 1771 p1 = setup_buffer; 1772 i = 0; 1773 while (*p1 && (i < MAX_SETUP_ARGS)) { 1774 p2 = strchr(p1, ','); 1775 if (p2) { 1776 *p2 = '\0'; 1777 if (p1 != p2) 1778 setup_args[i] = p1; 1779 p1 = p2 + 1; 1780 i++; 1781 } else { 1782 setup_args[i] = p1; 1783 break; 1784 } 1785 } 1786 for (i = 0; i < MAX_SETUP_ARGS; i++) 1787 setup_used[i] = 0; 1788 done_setup = 1; 1789 1790 return 1; 1791} 1792__setup("wd33c93=", wd33c93_setup); 1793 1794/* check_setup_args() returns index if key found, 0 if not 1795 */ 1796static int 1797check_setup_args(char *key, int *flags, int *val, char *buf) 1798{ 1799 int x; 1800 char *cp; 1801 1802 for (x = 0; x < MAX_SETUP_ARGS; x++) { 1803 if (setup_used[x]) 1804 continue; 1805 if (!strncmp(setup_args[x], key, strlen(key))) 1806 break; 1807 if (!strncmp(setup_args[x], "next", strlen("next"))) 1808 return 0; 1809 } 1810 if (x == MAX_SETUP_ARGS) 1811 return 0; 1812 setup_used[x] = 1; 1813 cp = setup_args[x] + strlen(key); 1814 *val = -1; 1815 if (*cp != ':') 1816 return ++x; 1817 cp++; 1818 if ((*cp >= '0') && (*cp <= '9')) { 1819 *val = simple_strtoul(cp, NULL, 0); 1820 } 1821 return ++x; 1822} 1823 1824/* 1825 * Calculate internal data-transfer-clock cycle from input-clock 1826 * frequency (/MHz) and fill 'sx_table'. 1827 * 1828 * The original driver used to rely on a fixed sx_table, containing periods 1829 * for (only) the lower limits of the respective input-clock-frequency ranges 1830 * (8-10/12-15/16-20 MHz). Although it seems, that no problems ocurred with 1831 * this setting so far, it might be desirable to adjust the transfer periods 1832 * closer to the really attached, possibly 25% higher, input-clock, since 1833 * - the wd33c93 may really use a significant shorter period, than it has 1834 * negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz 1835 * instead). 1836 * - the wd33c93 may ask the target for a lower transfer rate, than the target 1837 * is capable of (eg. negotiating for an assumed minimum of 252ns instead of 1838 * possible 200ns, which indeed shows up in tests as an approx. 10% lower 1839 * transfer rate). 1840 */ 1841static inline unsigned int 1842round_4(unsigned int x) 1843{ 1844 switch (x & 3) { 1845 case 1: --x; 1846 break; 1847 case 2: ++x; 1848 case 3: ++x; 1849 } 1850 return x; 1851} 1852 1853static void 1854calc_sx_table(unsigned int mhz, struct sx_period sx_table[9]) 1855{ 1856 unsigned int d, i; 1857 if (mhz < 11) 1858 d = 2; /* divisor for 8-10 MHz input-clock */ 1859 else if (mhz < 16) 1860 d = 3; /* divisor for 12-15 MHz input-clock */ 1861 else 1862 d = 4; /* divisor for 16-20 MHz input-clock */ 1863 1864 d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */ 1865 1866 sx_table[0].period_ns = 1; 1867 sx_table[0].reg_value = 0x20; 1868 for (i = 1; i < 8; i++) { 1869 sx_table[i].period_ns = round_4((i+1)*d / 100); 1870 sx_table[i].reg_value = (i+1)*0x10; 1871 } 1872 sx_table[7].reg_value = 0; 1873 sx_table[8].period_ns = 0; 1874 sx_table[8].reg_value = 0; 1875} 1876 1877/* 1878 * check and, maybe, map an init- or "clock:"- argument. 1879 */ 1880static uchar 1881set_clk_freq(int freq, int *mhz) 1882{ 1883 int x = freq; 1884 if (WD33C93_FS_8_10 == freq) 1885 freq = 8; 1886 else if (WD33C93_FS_12_15 == freq) 1887 freq = 12; 1888 else if (WD33C93_FS_16_20 == freq) 1889 freq = 16; 1890 else if (freq > 7 && freq < 11) 1891 x = WD33C93_FS_8_10; 1892 else if (freq > 11 && freq < 16) 1893 x = WD33C93_FS_12_15; 1894 else if (freq > 15 && freq < 21) 1895 x = WD33C93_FS_16_20; 1896 else { 1897 /* Hmm, wouldn't it be safer to assume highest freq here? */ 1898 x = WD33C93_FS_8_10; 1899 freq = 8; 1900 } 1901 *mhz = freq; 1902 return x; 1903} 1904 1905/* 1906 * to be used with the resync: fast: ... options 1907 */ 1908static inline void set_resync ( struct WD33C93_hostdata *hd, int mask ) 1909{ 1910 int i; 1911 for (i = 0; i < 8; i++) 1912 if (mask & (1 << i)) 1913 hd->sync_stat[i] = SS_UNSET; 1914} 1915 1916void 1917wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs, 1918 dma_setup_t setup, dma_stop_t stop, int clock_freq) 1919{ 1920 struct WD33C93_hostdata *hostdata; 1921 int i; 1922 int flags; 1923 int val; 1924 char buf[32]; 1925 1926 if (!done_setup && setup_strings) 1927 wd33c93_setup(setup_strings); 1928 1929 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1930 1931 hostdata->regs = regs; 1932 hostdata->clock_freq = set_clk_freq(clock_freq, &i); 1933 calc_sx_table(i, hostdata->sx_table); 1934 hostdata->dma_setup = setup; 1935 hostdata->dma_stop = stop; 1936 hostdata->dma_bounce_buffer = NULL; 1937 hostdata->dma_bounce_len = 0; 1938 for (i = 0; i < 8; i++) { 1939 hostdata->busy[i] = 0; 1940 hostdata->sync_xfer[i] = 1941 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF, 1942 0, hostdata->sx_table); 1943 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ 1944#ifdef PROC_STATISTICS 1945 hostdata->cmd_cnt[i] = 0; 1946 hostdata->disc_allowed_cnt[i] = 0; 1947 hostdata->disc_done_cnt[i] = 0; 1948#endif 1949 } 1950 hostdata->input_Q = NULL; 1951 hostdata->selecting = NULL; 1952 hostdata->connected = NULL; 1953 hostdata->disconnected_Q = NULL; 1954 hostdata->state = S_UNCONNECTED; 1955 hostdata->dma = D_DMA_OFF; 1956 hostdata->level2 = L2_BASIC; 1957 hostdata->disconnect = DIS_ADAPTIVE; 1958 hostdata->args = DEBUG_DEFAULTS; 1959 hostdata->incoming_ptr = 0; 1960 hostdata->outgoing_len = 0; 1961 hostdata->default_sx_per = DEFAULT_SX_PER; 1962 hostdata->no_sync = 0xff; /* sync defaults to off */ 1963 hostdata->no_dma = 0; /* default is DMA enabled */ 1964 hostdata->fast = 0; /* default is Fast SCSI transfers disabled */ 1965 hostdata->dma_mode = CTRL_DMA; /* default is Single Byte DMA */ 1966 1967#ifdef PROC_INTERFACE 1968 hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS | 1969 PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP; 1970#ifdef PROC_STATISTICS 1971 hostdata->dma_cnt = 0; 1972 hostdata->pio_cnt = 0; 1973 hostdata->int_cnt = 0; 1974#endif 1975#endif 1976 1977 if (check_setup_args("clock", &flags, &val, buf)) { 1978 hostdata->clock_freq = set_clk_freq(val, &val); 1979 calc_sx_table(val, hostdata->sx_table); 1980 } 1981 1982 if (check_setup_args("nosync", &flags, &val, buf)) 1983 hostdata->no_sync = val; 1984 1985 if (check_setup_args("nodma", &flags, &val, buf)) 1986 hostdata->no_dma = (val == -1) ? 1 : val; 1987 1988 if (check_setup_args("period", &flags, &val, buf)) 1989 hostdata->default_sx_per = 1990 hostdata->sx_table[round_period((unsigned int) val, 1991 hostdata->sx_table)].period_ns; 1992 1993 if (check_setup_args("disconnect", &flags, &val, buf)) { 1994 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS)) 1995 hostdata->disconnect = val; 1996 else 1997 hostdata->disconnect = DIS_ADAPTIVE; 1998 } 1999 2000 if (check_setup_args("level2", &flags, &val, buf)) 2001 hostdata->level2 = val; 2002 2003 if (check_setup_args("debug", &flags, &val, buf)) 2004 hostdata->args = val & DB_MASK; 2005 2006 if (check_setup_args("burst", &flags, &val, buf)) 2007 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA; 2008 2009 if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */ 2010 && check_setup_args("fast", &flags, &val, buf)) 2011 hostdata->fast = !!val; 2012 2013 if ((i = check_setup_args("next", &flags, &val, buf))) { 2014 while (i) 2015 setup_used[--i] = 1; 2016 } 2017#ifdef PROC_INTERFACE 2018 if (check_setup_args("proc", &flags, &val, buf)) 2019 hostdata->proc = val; 2020#endif 2021 2022 spin_lock_irq(&hostdata->lock); 2023 reset_wd33c93(instance); 2024 spin_unlock_irq(&hostdata->lock); 2025 2026 printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d", 2027 instance->host_no, 2028 (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip == 2029 C_WD33C93A) ? 2030 "WD33c93A" : (hostdata->chip == 2031 C_WD33C93B) ? "WD33c93B" : "unknown", 2032 hostdata->microcode, hostdata->no_sync, hostdata->no_dma); 2033#ifdef DEBUGGING_ON 2034 printk(" debug_flags=0x%02x\n", hostdata->args); 2035#else 2036 printk(" debugging=OFF\n"); 2037#endif 2038 printk(" setup_args="); 2039 for (i = 0; i < MAX_SETUP_ARGS; i++) 2040 printk("%s,", setup_args[i]); 2041 printk("\n"); 2042 printk(" Version %s - %s, Compiled %s at %s\n", 2043 WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__); 2044} 2045 2046int 2047wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in) 2048{ 2049 2050#ifdef PROC_INTERFACE 2051 2052 char *bp; 2053 char tbuf[128]; 2054 struct WD33C93_hostdata *hd; 2055 struct scsi_cmnd *cmd; 2056 int x; 2057 static int stop = 0; 2058 2059 hd = (struct WD33C93_hostdata *) instance->hostdata; 2060 2061/* If 'in' is TRUE we need to _read_ the proc file. We accept the following 2062 * keywords (same format as command-line, but arguments are not optional): 2063 * debug 2064 * disconnect 2065 * period 2066 * resync 2067 * proc 2068 * nodma 2069 * level2 2070 * burst 2071 * fast 2072 * nosync 2073 */ 2074 2075 if (in) { 2076 buf[len] = '\0'; 2077 for (bp = buf; *bp; ) { 2078 while (',' == *bp || ' ' == *bp) 2079 ++bp; 2080 if (!strncmp(bp, "debug:", 6)) { 2081 hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK; 2082 } else if (!strncmp(bp, "disconnect:", 11)) { 2083 x = simple_strtoul(bp+11, &bp, 0); 2084 if (x < DIS_NEVER || x > DIS_ALWAYS) 2085 x = DIS_ADAPTIVE; 2086 hd->disconnect = x; 2087 } else if (!strncmp(bp, "period:", 7)) { 2088 x = simple_strtoul(bp+7, &bp, 0); 2089 hd->default_sx_per = 2090 hd->sx_table[round_period((unsigned int) x, 2091 hd->sx_table)].period_ns; 2092 } else if (!strncmp(bp, "resync:", 7)) { 2093 set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0)); 2094 } else if (!strncmp(bp, "proc:", 5)) { 2095 hd->proc = simple_strtoul(bp+5, &bp, 0); 2096 } else if (!strncmp(bp, "nodma:", 6)) { 2097 hd->no_dma = simple_strtoul(bp+6, &bp, 0); 2098 } else if (!strncmp(bp, "level2:", 7)) { 2099 hd->level2 = simple_strtoul(bp+7, &bp, 0); 2100 } else if (!strncmp(bp, "burst:", 6)) { 2101 hd->dma_mode = 2102 simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA; 2103 } else if (!strncmp(bp, "fast:", 5)) { 2104 x = !!simple_strtol(bp+5, &bp, 0); 2105 if (x != hd->fast) 2106 set_resync(hd, 0xff); 2107 hd->fast = x; 2108 } else if (!strncmp(bp, "nosync:", 7)) { 2109 x = simple_strtoul(bp+7, &bp, 0); 2110 set_resync(hd, x ^ hd->no_sync); 2111 hd->no_sync = x; 2112 } else { 2113 break; /* unknown keyword,syntax-error,... */ 2114 } 2115 } 2116 return len; 2117 } 2118 2119 spin_lock_irq(&hd->lock); 2120 bp = buf; 2121 *bp = '\0'; 2122 if (hd->proc & PR_VERSION) { 2123 sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s", 2124 WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__); 2125 strcat(bp, tbuf); 2126 } 2127 if (hd->proc & PR_INFO) { 2128 sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d" 2129 " dma_mode=%02x fast=%d", 2130 hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast); 2131 strcat(bp, tbuf); 2132 strcat(bp, "\nsync_xfer[] = "); 2133 for (x = 0; x < 7; x++) { 2134 sprintf(tbuf, "\t%02x", hd->sync_xfer[x]); 2135 strcat(bp, tbuf); 2136 } 2137 strcat(bp, "\nsync_stat[] = "); 2138 for (x = 0; x < 7; x++) { 2139 sprintf(tbuf, "\t%02x", hd->sync_stat[x]); 2140 strcat(bp, tbuf); 2141 } 2142 } 2143#ifdef PROC_STATISTICS 2144 if (hd->proc & PR_STATISTICS) { 2145 strcat(bp, "\ncommands issued: "); 2146 for (x = 0; x < 7; x++) { 2147 sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]); 2148 strcat(bp, tbuf); 2149 } 2150 strcat(bp, "\ndisconnects allowed:"); 2151 for (x = 0; x < 7; x++) { 2152 sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]); 2153 strcat(bp, tbuf); 2154 } 2155 strcat(bp, "\ndisconnects done: "); 2156 for (x = 0; x < 7; x++) { 2157 sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]); 2158 strcat(bp, tbuf); 2159 } 2160 sprintf(tbuf, 2161 "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO", 2162 hd->int_cnt, hd->dma_cnt, hd->pio_cnt); 2163 strcat(bp, tbuf); 2164 } 2165#endif 2166 if (hd->proc & PR_CONNECTED) { 2167 strcat(bp, "\nconnected: "); 2168 if (hd->connected) { 2169 cmd = (struct scsi_cmnd *) hd->connected; 2170 sprintf(tbuf, " %ld-%d:%d(%02x)", 2171 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2172 strcat(bp, tbuf); 2173 } 2174 } 2175 if (hd->proc & PR_INPUTQ) { 2176 strcat(bp, "\ninput_Q: "); 2177 cmd = (struct scsi_cmnd *) hd->input_Q; 2178 while (cmd) { 2179 sprintf(tbuf, " %ld-%d:%d(%02x)", 2180 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2181 strcat(bp, tbuf); 2182 cmd = (struct scsi_cmnd *) cmd->host_scribble; 2183 } 2184 } 2185 if (hd->proc & PR_DISCQ) { 2186 strcat(bp, "\ndisconnected_Q:"); 2187 cmd = (struct scsi_cmnd *) hd->disconnected_Q; 2188 while (cmd) { 2189 sprintf(tbuf, " %ld-%d:%d(%02x)", 2190 cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2191 strcat(bp, tbuf); 2192 cmd = (struct scsi_cmnd *) cmd->host_scribble; 2193 } 2194 } 2195 strcat(bp, "\n"); 2196 spin_unlock_irq(&hd->lock); 2197 *start = buf; 2198 if (stop) { 2199 stop = 0; 2200 return 0; 2201 } 2202 if (off > 0x40000) /* ALWAYS stop after 256k bytes have been read */ 2203 stop = 1; 2204 if (hd->proc & PR_STOP) /* stop every other time */ 2205 stop = 1; 2206 return strlen(bp); 2207 2208#else /* PROC_INTERFACE */ 2209 2210 return 0; 2211 2212#endif /* PROC_INTERFACE */ 2213 2214} 2215 2216void 2217wd33c93_release(void) 2218{ 2219} 2220 2221EXPORT_SYMBOL(wd33c93_host_reset); 2222EXPORT_SYMBOL(wd33c93_init); 2223EXPORT_SYMBOL(wd33c93_release); 2224EXPORT_SYMBOL(wd33c93_abort); 2225EXPORT_SYMBOL(wd33c93_queuecommand); 2226EXPORT_SYMBOL(wd33c93_intr); 2227EXPORT_SYMBOL(wd33c93_proc_info); 2228