1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 1996 John Shifflett, GeoLog Consulting 4 * john@geolog.com 5 * jshiffle@netcom.com 6 */ 7 8 /* 9 * Drew Eckhardt's excellent 'Generic NCR5380' sources from Linux-PC 10 * provided much of the inspiration and some of the code for this 11 * driver. Everything I know about Amiga DMA was gleaned from careful 12 * reading of Hamish Mcdonald's original wd33c93 driver; in fact, I 13 * borrowed shamelessly from all over that source. Thanks Hamish! 14 * 15 * _This_ driver is (I feel) an improvement over the old one in 16 * several respects: 17 * 18 * - Target Disconnection/Reconnection is now supported. Any 19 * system with more than one device active on the SCSI bus 20 * will benefit from this. The driver defaults to what I 21 * call 'adaptive disconnect' - meaning that each command 22 * is evaluated individually as to whether or not it should 23 * be run with the option to disconnect/reselect (if the 24 * device chooses), or as a "SCSI-bus-hog". 25 * 26 * - Synchronous data transfers are now supported. Because of 27 * a few devices that choke after telling the driver that 28 * they can do sync transfers, we don't automatically use 29 * this faster protocol - it can be enabled via the command- 30 * line on a device-by-device basis. 31 * 32 * - Runtime operating parameters can now be specified through 33 * the 'amiboot' or the 'insmod' command line. For amiboot do: 34 * "amiboot [usual stuff] wd33c93=blah,blah,blah" 35 * The defaults should be good for most people. See the comment 36 * for 'setup_strings' below for more details. 37 * 38 * - The old driver relied exclusively on what the Western Digital 39 * docs call "Combination Level 2 Commands", which are a great 40 * idea in that the CPU is relieved of a lot of interrupt 41 * overhead. However, by accepting a certain (user-settable) 42 * amount of additional interrupts, this driver achieves 43 * better control over the SCSI bus, and data transfers are 44 * almost as fast while being much easier to define, track, 45 * and debug. 46 * 47 * 48 * TODO: 49 * more speed. linked commands. 50 * 51 * 52 * People with bug reports, wish-lists, complaints, comments, 53 * or improvements are asked to pah-leeez email me (John Shifflett) 54 * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get 55 * this thing into as good a shape as possible, and I'm positive 56 * there are lots of lurking bugs and "Stupid Places". 57 * 58 * Updates: 59 * 60 * Added support for pre -A chips, which don't have advanced features 61 * and will generate CSR_RESEL rather than CSR_RESEL_AM. 62 * Richard Hirst <richard@sleepie.demon.co.uk> August 2000 63 * 64 * Added support for Burst Mode DMA and Fast SCSI. Enabled the use of 65 * default_sx_per for asynchronous data transfers. Added adjustment 66 * of transfer periods in sx_table to the actual input-clock. 67 * peter fuerst <post@pfrst.de> February 2007 68 */ 69 70 #include <linux/module.h> 71 72 #include <linux/string.h> 73 #include <linux/delay.h> 74 #include <linux/init.h> 75 #include <linux/interrupt.h> 76 #include <linux/blkdev.h> 77 78 #include <scsi/scsi.h> 79 #include <scsi/scsi_cmnd.h> 80 #include <scsi/scsi_device.h> 81 #include <scsi/scsi_host.h> 82 83 #include <asm/irq.h> 84 85 #include "wd33c93.h" 86 87 #define optimum_sx_per(hostdata) (hostdata)->sx_table[1].period_ns 88 89 90 #define WD33C93_VERSION "1.26++" 91 #define WD33C93_DATE "10/Feb/2007" 92 93 MODULE_AUTHOR("John Shifflett"); 94 MODULE_DESCRIPTION("Generic WD33C93 SCSI driver"); 95 MODULE_LICENSE("GPL"); 96 97 /* 98 * 'setup_strings' is a single string used to pass operating parameters and 99 * settings from the kernel/module command-line to the driver. 'setup_args[]' 100 * is an array of strings that define the compile-time default values for 101 * these settings. If Linux boots with an amiboot or insmod command-line, 102 * those settings are combined with 'setup_args[]'. Note that amiboot 103 * command-lines are prefixed with "wd33c93=" while insmod uses a 104 * "setup_strings=" prefix. The driver recognizes the following keywords 105 * (lower case required) and arguments: 106 * 107 * - nosync:bitmask -bitmask is a byte where the 1st 7 bits correspond with 108 * the 7 possible SCSI devices. Set a bit to negotiate for 109 * asynchronous transfers on that device. To maintain 110 * backwards compatibility, a command-line such as 111 * "wd33c93=255" will be automatically translated to 112 * "wd33c93=nosync:0xff". 113 * - nodma:x -x = 1 to disable DMA, x = 0 to enable it. Argument is 114 * optional - if not present, same as "nodma:1". 115 * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer 116 * period. Default is 500; acceptable values are 250 - 1000. 117 * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them. 118 * x = 1 does 'adaptive' disconnects, which is the default 119 * and generally the best choice. 120 * - debug:x -If 'DEBUGGING_ON' is defined, x is a bit mask that causes 121 * various types of debug output to printed - see the DB_xxx 122 * defines in wd33c93.h 123 * - clock:x -x = clock input in MHz for WD33c93 chip. Normal values 124 * would be from 8 through 20. Default is 8. 125 * - burst:x -x = 1 to use Burst Mode (or Demand-Mode) DMA, x = 0 to use 126 * Single Byte DMA, which is the default. Argument is 127 * optional - if not present, same as "burst:1". 128 * - fast:x -x = 1 to enable Fast SCSI, which is only effective with 129 * input-clock divisor 4 (WD33C93_FS_16_20), x = 0 to disable 130 * it, which is the default. Argument is optional - if not 131 * present, same as "fast:1". 132 * - next -No argument. Used to separate blocks of keywords when 133 * there's more than one host adapter in the system. 134 * 135 * Syntax Notes: 136 * - Numeric arguments can be decimal or the '0x' form of hex notation. There 137 * _must_ be a colon between a keyword and its numeric argument, with no 138 * spaces. 139 * - Keywords are separated by commas, no spaces, in the standard kernel 140 * command-line manner. 141 * - A keyword in the 'nth' comma-separated command-line member will overwrite 142 * the 'nth' element of setup_args[]. A blank command-line member (in 143 * other words, a comma with no preceding keyword) will _not_ overwrite 144 * the corresponding setup_args[] element. 145 * - If a keyword is used more than once, the first one applies to the first 146 * SCSI host found, the second to the second card, etc, unless the 'next' 147 * keyword is used to change the order. 148 * 149 * Some amiboot examples (for insmod, use 'setup_strings' instead of 'wd33c93'): 150 * - wd33c93=nosync:255 151 * - wd33c93=nodma 152 * - wd33c93=nodma:1 153 * - wd33c93=disconnect:2,nosync:0x08,period:250 154 * - wd33c93=debug:0x1c 155 */ 156 157 /* Normally, no defaults are specified */ 158 static char *setup_args[] = { "", "", "", "", "", "", "", "", "", "" }; 159 160 static char *setup_strings; 161 module_param(setup_strings, charp, 0); 162 163 static void wd33c93_execute(struct Scsi_Host *instance); 164 165 static inline uchar 166 read_wd33c93(const wd33c93_regs regs, uchar reg_num) 167 { 168 *regs.SASR = reg_num; 169 mb(); 170 return (*regs.SCMD); 171 } 172 173 static unsigned long 174 read_wd33c93_count(const wd33c93_regs regs) 175 { 176 unsigned long value; 177 178 *regs.SASR = WD_TRANSFER_COUNT_MSB; 179 mb(); 180 value = *regs.SCMD << 16; 181 value |= *regs.SCMD << 8; 182 value |= *regs.SCMD; 183 mb(); 184 return value; 185 } 186 187 static inline uchar 188 read_aux_stat(const wd33c93_regs regs) 189 { 190 return *regs.SASR; 191 } 192 193 static inline void 194 write_wd33c93(const wd33c93_regs regs, uchar reg_num, uchar value) 195 { 196 *regs.SASR = reg_num; 197 mb(); 198 *regs.SCMD = value; 199 mb(); 200 } 201 202 static void 203 write_wd33c93_count(const wd33c93_regs regs, unsigned long value) 204 { 205 *regs.SASR = WD_TRANSFER_COUNT_MSB; 206 mb(); 207 *regs.SCMD = value >> 16; 208 *regs.SCMD = value >> 8; 209 *regs.SCMD = value; 210 mb(); 211 } 212 213 static inline void 214 write_wd33c93_cmd(const wd33c93_regs regs, uchar cmd) 215 { 216 *regs.SASR = WD_COMMAND; 217 mb(); 218 *regs.SCMD = cmd; 219 mb(); 220 } 221 222 static inline void 223 write_wd33c93_cdb(const wd33c93_regs regs, uint len, uchar cmnd[]) 224 { 225 int i; 226 227 *regs.SASR = WD_CDB_1; 228 for (i = 0; i < len; i++) 229 *regs.SCMD = cmnd[i]; 230 } 231 232 static inline uchar 233 read_1_byte(const wd33c93_regs regs) 234 { 235 uchar asr; 236 uchar x = 0; 237 238 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 239 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO | 0x80); 240 do { 241 asr = read_aux_stat(regs); 242 if (asr & ASR_DBR) 243 x = read_wd33c93(regs, WD_DATA); 244 } while (!(asr & ASR_INT)); 245 return x; 246 } 247 248 static int 249 round_period(unsigned int period, const struct sx_period *sx_table) 250 { 251 int x; 252 253 for (x = 1; sx_table[x].period_ns; x++) { 254 if ((period <= sx_table[x - 0].period_ns) && 255 (period > sx_table[x - 1].period_ns)) { 256 return x; 257 } 258 } 259 return 7; 260 } 261 262 /* 263 * Calculate Synchronous Transfer Register value from SDTR code. 264 */ 265 static uchar 266 calc_sync_xfer(unsigned int period, unsigned int offset, unsigned int fast, 267 const struct sx_period *sx_table) 268 { 269 /* When doing Fast SCSI synchronous data transfers, the corresponding 270 * value in 'sx_table' is two times the actually used transfer period. 271 */ 272 uchar result; 273 274 if (offset && fast) { 275 fast = STR_FSS; 276 period *= 2; 277 } else { 278 fast = 0; 279 } 280 period *= 4; /* convert SDTR code to ns */ 281 result = sx_table[round_period(period,sx_table)].reg_value; 282 result |= (offset < OPTIMUM_SX_OFF) ? offset : OPTIMUM_SX_OFF; 283 result |= fast; 284 return result; 285 } 286 287 /* 288 * Calculate SDTR code bytes [3],[4] from period and offset. 289 */ 290 static inline void 291 calc_sync_msg(unsigned int period, unsigned int offset, unsigned int fast, 292 uchar msg[2]) 293 { 294 /* 'period' is a "normal"-mode value, like the ones in 'sx_table'. The 295 * actually used transfer period for Fast SCSI synchronous data 296 * transfers is half that value. 297 */ 298 period /= 4; 299 if (offset && fast) 300 period /= 2; 301 msg[0] = period; 302 msg[1] = offset; 303 } 304 305 static int wd33c93_queuecommand_lck(struct scsi_cmnd *cmd) 306 { 307 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); 308 struct WD33C93_hostdata *hostdata; 309 struct scsi_cmnd *tmp; 310 311 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; 312 313 DB(DB_QUEUE_COMMAND, 314 printk("Q-%d-%02x( ", cmd->device->id, cmd->cmnd[0])) 315 316 /* Set up a few fields in the scsi_cmnd structure for our own use: 317 * - host_scribble is the pointer to the next cmd in the input queue 318 * - result is what you'd expect 319 */ 320 cmd->host_scribble = NULL; 321 cmd->result = 0; 322 323 /* We use the Scsi_Pointer structure that's included with each command 324 * as a scratchpad (as it's intended to be used!). The handy thing about 325 * the SCp.xxx fields is that they're always associated with a given 326 * cmd, and are preserved across disconnect-reselect. This means we 327 * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages 328 * if we keep all the critical pointers and counters in SCp: 329 * - SCp.ptr is the pointer into the RAM buffer 330 * - SCp.this_residual is the size of that buffer 331 * - SCp.buffer points to the current scatter-gather buffer 332 * - SCp.buffers_residual tells us how many S.G. buffers there are 333 * - SCp.have_data_in is not used 334 * - SCp.sent_command is not used 335 * - SCp.phase records this command's SRCID_ER bit setting 336 */ 337 338 if (scsi_bufflen(cmd)) { 339 scsi_pointer->buffer = scsi_sglist(cmd); 340 scsi_pointer->buffers_residual = scsi_sg_count(cmd) - 1; 341 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); 342 scsi_pointer->this_residual = scsi_pointer->buffer->length; 343 } else { 344 scsi_pointer->buffer = NULL; 345 scsi_pointer->buffers_residual = 0; 346 scsi_pointer->ptr = NULL; 347 scsi_pointer->this_residual = 0; 348 } 349 350 /* WD docs state that at the conclusion of a "LEVEL2" command, the 351 * status byte can be retrieved from the LUN register. Apparently, 352 * this is the case only for *uninterrupted* LEVEL2 commands! If 353 * there are any unexpected phases entered, even if they are 100% 354 * legal (different devices may choose to do things differently), 355 * the LEVEL2 command sequence is exited. This often occurs prior 356 * to receiving the status byte, in which case the driver does a 357 * status phase interrupt and gets the status byte on its own. 358 * While such a command can then be "resumed" (ie restarted to 359 * finish up as a LEVEL2 command), the LUN register will NOT be 360 * a valid status byte at the command's conclusion, and we must 361 * use the byte obtained during the earlier interrupt. Here, we 362 * preset SCp.Status to an illegal value (0xff) so that when 363 * this command finally completes, we can tell where the actual 364 * status byte is stored. 365 */ 366 367 scsi_pointer->Status = ILLEGAL_STATUS_BYTE; 368 369 /* 370 * Add the cmd to the end of 'input_Q'. Note that REQUEST SENSE 371 * commands are added to the head of the queue so that the desired 372 * sense data is not lost before REQUEST_SENSE executes. 373 */ 374 375 spin_lock_irq(&hostdata->lock); 376 377 if (!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) { 378 cmd->host_scribble = (uchar *) hostdata->input_Q; 379 hostdata->input_Q = cmd; 380 } else { /* find the end of the queue */ 381 for (tmp = (struct scsi_cmnd *) hostdata->input_Q; 382 tmp->host_scribble; 383 tmp = (struct scsi_cmnd *) tmp->host_scribble) ; 384 tmp->host_scribble = (uchar *) cmd; 385 } 386 387 /* We know that there's at least one command in 'input_Q' now. 388 * Go see if any of them are runnable! 389 */ 390 391 wd33c93_execute(cmd->device->host); 392 393 DB(DB_QUEUE_COMMAND, printk(")Q ")) 394 395 spin_unlock_irq(&hostdata->lock); 396 return 0; 397 } 398 399 DEF_SCSI_QCMD(wd33c93_queuecommand) 400 401 /* 402 * This routine attempts to start a scsi command. If the host_card is 403 * already connected, we give up immediately. Otherwise, look through 404 * the input_Q, using the first command we find that's intended 405 * for a currently non-busy target/lun. 406 * 407 * wd33c93_execute() is always called with interrupts disabled or from 408 * the wd33c93_intr itself, which means that a wd33c93 interrupt 409 * cannot occur while we are in here. 410 */ 411 static void 412 wd33c93_execute(struct Scsi_Host *instance) 413 { 414 struct scsi_pointer *scsi_pointer; 415 struct WD33C93_hostdata *hostdata = 416 (struct WD33C93_hostdata *) instance->hostdata; 417 const wd33c93_regs regs = hostdata->regs; 418 struct scsi_cmnd *cmd, *prev; 419 420 DB(DB_EXECUTE, printk("EX(")) 421 if (hostdata->selecting || hostdata->connected) { 422 DB(DB_EXECUTE, printk(")EX-0 ")) 423 return; 424 } 425 426 /* 427 * Search through the input_Q for a command destined 428 * for an idle target/lun. 429 */ 430 431 cmd = (struct scsi_cmnd *) hostdata->input_Q; 432 prev = NULL; 433 while (cmd) { 434 if (!(hostdata->busy[cmd->device->id] & 435 (1 << (cmd->device->lun & 0xff)))) 436 break; 437 prev = cmd; 438 cmd = (struct scsi_cmnd *) cmd->host_scribble; 439 } 440 441 /* quit if queue empty or all possible targets are busy */ 442 443 if (!cmd) { 444 DB(DB_EXECUTE, printk(")EX-1 ")) 445 return; 446 } 447 448 /* remove command from queue */ 449 450 if (prev) 451 prev->host_scribble = cmd->host_scribble; 452 else 453 hostdata->input_Q = (struct scsi_cmnd *) cmd->host_scribble; 454 455 #ifdef PROC_STATISTICS 456 hostdata->cmd_cnt[cmd->device->id]++; 457 #endif 458 459 /* 460 * Start the selection process 461 */ 462 463 if (cmd->sc_data_direction == DMA_TO_DEVICE) 464 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); 465 else 466 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id | DSTID_DPD); 467 468 /* Now we need to figure out whether or not this command is a good 469 * candidate for disconnect/reselect. We guess to the best of our 470 * ability, based on a set of hierarchical rules. When several 471 * devices are operating simultaneously, disconnects are usually 472 * an advantage. In a single device system, or if only 1 device 473 * is being accessed, transfers usually go faster if disconnects 474 * are not allowed: 475 * 476 * + Commands should NEVER disconnect if hostdata->disconnect = 477 * DIS_NEVER (this holds for tape drives also), and ALWAYS 478 * disconnect if hostdata->disconnect = DIS_ALWAYS. 479 * + Tape drive commands should always be allowed to disconnect. 480 * + Disconnect should be allowed if disconnected_Q isn't empty. 481 * + Commands should NOT disconnect if input_Q is empty. 482 * + Disconnect should be allowed if there are commands in input_Q 483 * for a different target/lun. In this case, the other commands 484 * should be made disconnect-able, if not already. 485 * 486 * I know, I know - this code would flunk me out of any 487 * "C Programming 101" class ever offered. But it's easy 488 * to change around and experiment with for now. 489 */ 490 491 scsi_pointer = WD33C93_scsi_pointer(cmd); 492 scsi_pointer->phase = 0; /* assume no disconnect */ 493 if (hostdata->disconnect == DIS_NEVER) 494 goto no; 495 if (hostdata->disconnect == DIS_ALWAYS) 496 goto yes; 497 if (cmd->device->type == 1) /* tape drive? */ 498 goto yes; 499 if (hostdata->disconnected_Q) /* other commands disconnected? */ 500 goto yes; 501 if (!(hostdata->input_Q)) /* input_Q empty? */ 502 goto no; 503 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; 504 prev = (struct scsi_cmnd *) prev->host_scribble) { 505 if ((prev->device->id != cmd->device->id) || 506 (prev->device->lun != cmd->device->lun)) { 507 for (prev = (struct scsi_cmnd *) hostdata->input_Q; prev; 508 prev = (struct scsi_cmnd *) prev->host_scribble) 509 WD33C93_scsi_pointer(prev)->phase = 1; 510 goto yes; 511 } 512 } 513 514 goto no; 515 516 yes: 517 scsi_pointer->phase = 1; 518 519 #ifdef PROC_STATISTICS 520 hostdata->disc_allowed_cnt[cmd->device->id]++; 521 #endif 522 523 no: 524 525 write_wd33c93(regs, WD_SOURCE_ID, scsi_pointer->phase ? SRCID_ER : 0); 526 527 write_wd33c93(regs, WD_TARGET_LUN, (u8)cmd->device->lun); 528 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 529 hostdata->sync_xfer[cmd->device->id]); 530 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF)); 531 532 if ((hostdata->level2 == L2_NONE) || 533 (hostdata->sync_stat[cmd->device->id] == SS_UNSET)) { 534 535 /* 536 * Do a 'Select-With-ATN' command. This will end with 537 * one of the following interrupts: 538 * CSR_RESEL_AM: failure - can try again later. 539 * CSR_TIMEOUT: failure - give up. 540 * CSR_SELECT: success - proceed. 541 */ 542 543 hostdata->selecting = cmd; 544 545 /* Every target has its own synchronous transfer setting, kept in the 546 * sync_xfer array, and a corresponding status byte in sync_stat[]. 547 * Each target's sync_stat[] entry is initialized to SX_UNSET, and its 548 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET 549 * means that the parameters are undetermined as yet, and that we 550 * need to send an SDTR message to this device after selection is 551 * complete: We set SS_FIRST to tell the interrupt routine to do so. 552 * If we've been asked not to try synchronous transfers on this 553 * target (and _all_ luns within it), we'll still send the SDTR message 554 * later, but at that time we'll negotiate for async by specifying a 555 * sync fifo depth of 0. 556 */ 557 if (hostdata->sync_stat[cmd->device->id] == SS_UNSET) 558 hostdata->sync_stat[cmd->device->id] = SS_FIRST; 559 hostdata->state = S_SELECTING; 560 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 561 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN); 562 } else { 563 564 /* 565 * Do a 'Select-With-ATN-Xfer' command. This will end with 566 * one of the following interrupts: 567 * CSR_RESEL_AM: failure - can try again later. 568 * CSR_TIMEOUT: failure - give up. 569 * anything else: success - proceed. 570 */ 571 572 hostdata->connected = cmd; 573 write_wd33c93(regs, WD_COMMAND_PHASE, 0); 574 575 /* copy command_descriptor_block into WD chip 576 * (take advantage of auto-incrementing) 577 */ 578 579 write_wd33c93_cdb(regs, cmd->cmd_len, cmd->cmnd); 580 581 /* The wd33c93 only knows about Group 0, 1, and 5 commands when 582 * it's doing a 'select-and-transfer'. To be safe, we write the 583 * size of the CDB into the OWN_ID register for every case. This 584 * way there won't be problems with vendor-unique, audio, etc. 585 */ 586 587 write_wd33c93(regs, WD_OWN_ID, cmd->cmd_len); 588 589 /* When doing a non-disconnect command with DMA, we can save 590 * ourselves a DATA phase interrupt later by setting everything 591 * up ahead of time. 592 */ 593 594 if (scsi_pointer->phase == 0 && hostdata->no_dma == 0) { 595 if (hostdata->dma_setup(cmd, 596 (cmd->sc_data_direction == DMA_TO_DEVICE) ? 597 DATA_OUT_DIR : DATA_IN_DIR)) 598 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 599 else { 600 write_wd33c93_count(regs, 601 scsi_pointer->this_residual); 602 write_wd33c93(regs, WD_CONTROL, 603 CTRL_IDI | CTRL_EDI | hostdata->dma_mode); 604 hostdata->dma = D_DMA_RUNNING; 605 } 606 } else 607 write_wd33c93_count(regs, 0); /* guarantee a DATA_PHASE interrupt */ 608 609 hostdata->state = S_RUNNING_LEVEL2; 610 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 611 } 612 613 /* 614 * Since the SCSI bus can handle only 1 connection at a time, 615 * we get out of here now. If the selection fails, or when 616 * the command disconnects, we'll come back to this routine 617 * to search the input_Q again... 618 */ 619 620 DB(DB_EXECUTE, 621 printk("%s)EX-2 ", scsi_pointer->phase ? "d:" : "")) 622 } 623 624 static void 625 transfer_pio(const wd33c93_regs regs, uchar * buf, int cnt, 626 int data_in_dir, struct WD33C93_hostdata *hostdata) 627 { 628 uchar asr; 629 630 DB(DB_TRANSFER, 631 printk("(%p,%d,%s:", buf, cnt, data_in_dir ? "in" : "out")) 632 633 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 634 write_wd33c93_count(regs, cnt); 635 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); 636 if (data_in_dir) { 637 do { 638 asr = read_aux_stat(regs); 639 if (asr & ASR_DBR) 640 *buf++ = read_wd33c93(regs, WD_DATA); 641 } while (!(asr & ASR_INT)); 642 } else { 643 do { 644 asr = read_aux_stat(regs); 645 if (asr & ASR_DBR) 646 write_wd33c93(regs, WD_DATA, *buf++); 647 } while (!(asr & ASR_INT)); 648 } 649 650 /* Note: we are returning with the interrupt UN-cleared. 651 * Since (presumably) an entire I/O operation has 652 * completed, the bus phase is probably different, and 653 * the interrupt routine will discover this when it 654 * responds to the uncleared int. 655 */ 656 657 } 658 659 static void 660 transfer_bytes(const wd33c93_regs regs, struct scsi_cmnd *cmd, 661 int data_in_dir) 662 { 663 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); 664 struct WD33C93_hostdata *hostdata; 665 unsigned long length; 666 667 hostdata = (struct WD33C93_hostdata *) cmd->device->host->hostdata; 668 669 /* Normally, you'd expect 'this_residual' to be non-zero here. 670 * In a series of scatter-gather transfers, however, this 671 * routine will usually be called with 'this_residual' equal 672 * to 0 and 'buffers_residual' non-zero. This means that a 673 * previous transfer completed, clearing 'this_residual', and 674 * now we need to setup the next scatter-gather buffer as the 675 * source or destination for THIS transfer. 676 */ 677 if (!scsi_pointer->this_residual && scsi_pointer->buffers_residual) { 678 scsi_pointer->buffer = sg_next(scsi_pointer->buffer); 679 --scsi_pointer->buffers_residual; 680 scsi_pointer->this_residual = scsi_pointer->buffer->length; 681 scsi_pointer->ptr = sg_virt(scsi_pointer->buffer); 682 } 683 if (!scsi_pointer->this_residual) /* avoid bogus setups */ 684 return; 685 686 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 687 hostdata->sync_xfer[cmd->device->id]); 688 689 /* 'hostdata->no_dma' is TRUE if we don't even want to try DMA. 690 * Update 'this_residual' and 'ptr' after 'transfer_pio()' returns. 691 */ 692 693 if (hostdata->no_dma || hostdata->dma_setup(cmd, data_in_dir)) { 694 #ifdef PROC_STATISTICS 695 hostdata->pio_cnt++; 696 #endif 697 transfer_pio(regs, (uchar *) scsi_pointer->ptr, 698 scsi_pointer->this_residual, data_in_dir, 699 hostdata); 700 length = scsi_pointer->this_residual; 701 scsi_pointer->this_residual = read_wd33c93_count(regs); 702 scsi_pointer->ptr += length - scsi_pointer->this_residual; 703 } 704 705 /* We are able to do DMA (in fact, the Amiga hardware is 706 * already going!), so start up the wd33c93 in DMA mode. 707 * We set 'hostdata->dma' = D_DMA_RUNNING so that when the 708 * transfer completes and causes an interrupt, we're 709 * reminded to tell the Amiga to shut down its end. We'll 710 * postpone the updating of 'this_residual' and 'ptr' 711 * until then. 712 */ 713 714 else { 715 #ifdef PROC_STATISTICS 716 hostdata->dma_cnt++; 717 #endif 718 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | hostdata->dma_mode); 719 write_wd33c93_count(regs, scsi_pointer->this_residual); 720 721 if ((hostdata->level2 >= L2_DATA) || 722 (hostdata->level2 == L2_BASIC && scsi_pointer->phase == 0)) { 723 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 724 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 725 hostdata->state = S_RUNNING_LEVEL2; 726 } else 727 write_wd33c93_cmd(regs, WD_CMD_TRANS_INFO); 728 729 hostdata->dma = D_DMA_RUNNING; 730 } 731 } 732 733 void 734 wd33c93_intr(struct Scsi_Host *instance) 735 { 736 struct scsi_pointer *scsi_pointer; 737 struct WD33C93_hostdata *hostdata = 738 (struct WD33C93_hostdata *) instance->hostdata; 739 const wd33c93_regs regs = hostdata->regs; 740 struct scsi_cmnd *patch, *cmd; 741 uchar asr, sr, phs, id, lun, *ucp, msg; 742 unsigned long length, flags; 743 744 asr = read_aux_stat(regs); 745 if (!(asr & ASR_INT) || (asr & ASR_BSY)) 746 return; 747 748 spin_lock_irqsave(&hostdata->lock, flags); 749 750 #ifdef PROC_STATISTICS 751 hostdata->int_cnt++; 752 #endif 753 754 cmd = (struct scsi_cmnd *) hostdata->connected; /* assume we're connected */ 755 scsi_pointer = WD33C93_scsi_pointer(cmd); 756 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear the interrupt */ 757 phs = read_wd33c93(regs, WD_COMMAND_PHASE); 758 759 DB(DB_INTR, printk("{%02x:%02x-", asr, sr)) 760 761 /* After starting a DMA transfer, the next interrupt 762 * is guaranteed to be in response to completion of 763 * the transfer. Since the Amiga DMA hardware runs in 764 * in an open-ended fashion, it needs to be told when 765 * to stop; do that here if D_DMA_RUNNING is true. 766 * Also, we have to update 'this_residual' and 'ptr' 767 * based on the contents of the TRANSFER_COUNT register, 768 * in case the device decided to do an intermediate 769 * disconnect (a device may do this if it has to do a 770 * seek, or just to be nice and let other devices have 771 * some bus time during long transfers). After doing 772 * whatever is needed, we go on and service the WD3393 773 * interrupt normally. 774 */ 775 if (hostdata->dma == D_DMA_RUNNING) { 776 DB(DB_TRANSFER, 777 printk("[%p/%d:", scsi_pointer->ptr, scsi_pointer->this_residual)) 778 hostdata->dma_stop(cmd->device->host, cmd, 1); 779 hostdata->dma = D_DMA_OFF; 780 length = scsi_pointer->this_residual; 781 scsi_pointer->this_residual = read_wd33c93_count(regs); 782 scsi_pointer->ptr += length - scsi_pointer->this_residual; 783 DB(DB_TRANSFER, 784 printk("%p/%d]", scsi_pointer->ptr, scsi_pointer->this_residual)) 785 } 786 787 /* Respond to the specific WD3393 interrupt - there are quite a few! */ 788 switch (sr) { 789 case CSR_TIMEOUT: 790 DB(DB_INTR, printk("TIMEOUT")) 791 792 if (hostdata->state == S_RUNNING_LEVEL2) 793 hostdata->connected = NULL; 794 else { 795 cmd = (struct scsi_cmnd *) hostdata->selecting; /* get a valid cmd */ 796 hostdata->selecting = NULL; 797 } 798 799 cmd->result = DID_NO_CONNECT << 16; 800 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); 801 hostdata->state = S_UNCONNECTED; 802 scsi_done(cmd); 803 804 /* From esp.c: 805 * There is a window of time within the scsi_done() path 806 * of execution where interrupts are turned back on full 807 * blast and left that way. During that time we could 808 * reconnect to a disconnected command, then we'd bomb 809 * out below. We could also end up executing two commands 810 * at _once_. ...just so you know why the restore_flags() 811 * is here... 812 */ 813 814 spin_unlock_irqrestore(&hostdata->lock, flags); 815 816 /* We are not connected to a target - check to see if there 817 * are commands waiting to be executed. 818 */ 819 820 wd33c93_execute(instance); 821 break; 822 823 /* Note: this interrupt should not occur in a LEVEL2 command */ 824 825 case CSR_SELECT: 826 DB(DB_INTR, printk("SELECT")) 827 hostdata->connected = cmd = 828 (struct scsi_cmnd *) hostdata->selecting; 829 hostdata->selecting = NULL; 830 831 /* construct an IDENTIFY message with correct disconnect bit */ 832 833 hostdata->outgoing_msg[0] = IDENTIFY(0, cmd->device->lun); 834 if (scsi_pointer->phase) 835 hostdata->outgoing_msg[0] |= 0x40; 836 837 if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) { 838 839 hostdata->sync_stat[cmd->device->id] = SS_WAITING; 840 841 /* Tack on a 2nd message to ask about synchronous transfers. If we've 842 * been asked to do only asynchronous transfers on this device, we 843 * request a fifo depth of 0, which is equivalent to async - should 844 * solve the problems some people have had with GVP's Guru ROM. 845 */ 846 847 hostdata->outgoing_msg[1] = EXTENDED_MESSAGE; 848 hostdata->outgoing_msg[2] = 3; 849 hostdata->outgoing_msg[3] = EXTENDED_SDTR; 850 if (hostdata->no_sync & (1 << cmd->device->id)) { 851 calc_sync_msg(hostdata->default_sx_per, 0, 852 0, hostdata->outgoing_msg + 4); 853 } else { 854 calc_sync_msg(optimum_sx_per(hostdata), 855 OPTIMUM_SX_OFF, 856 hostdata->fast, 857 hostdata->outgoing_msg + 4); 858 } 859 hostdata->outgoing_len = 6; 860 #ifdef SYNC_DEBUG 861 ucp = hostdata->outgoing_msg + 1; 862 printk(" sending SDTR %02x03%02x%02x%02x ", 863 ucp[0], ucp[2], ucp[3], ucp[4]); 864 #endif 865 } else 866 hostdata->outgoing_len = 1; 867 868 hostdata->state = S_CONNECTED; 869 spin_unlock_irqrestore(&hostdata->lock, flags); 870 break; 871 872 case CSR_XFER_DONE | PHS_DATA_IN: 873 case CSR_UNEXP | PHS_DATA_IN: 874 case CSR_SRV_REQ | PHS_DATA_IN: 875 DB(DB_INTR, 876 printk("IN-%d.%d", scsi_pointer->this_residual, 877 scsi_pointer->buffers_residual)) 878 transfer_bytes(regs, cmd, DATA_IN_DIR); 879 if (hostdata->state != S_RUNNING_LEVEL2) 880 hostdata->state = S_CONNECTED; 881 spin_unlock_irqrestore(&hostdata->lock, flags); 882 break; 883 884 case CSR_XFER_DONE | PHS_DATA_OUT: 885 case CSR_UNEXP | PHS_DATA_OUT: 886 case CSR_SRV_REQ | PHS_DATA_OUT: 887 DB(DB_INTR, 888 printk("OUT-%d.%d", scsi_pointer->this_residual, 889 scsi_pointer->buffers_residual)) 890 transfer_bytes(regs, cmd, DATA_OUT_DIR); 891 if (hostdata->state != S_RUNNING_LEVEL2) 892 hostdata->state = S_CONNECTED; 893 spin_unlock_irqrestore(&hostdata->lock, flags); 894 break; 895 896 /* Note: this interrupt should not occur in a LEVEL2 command */ 897 898 case CSR_XFER_DONE | PHS_COMMAND: 899 case CSR_UNEXP | PHS_COMMAND: 900 case CSR_SRV_REQ | PHS_COMMAND: 901 DB(DB_INTR, printk("CMND-%02x", cmd->cmnd[0])) 902 transfer_pio(regs, cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, 903 hostdata); 904 hostdata->state = S_CONNECTED; 905 spin_unlock_irqrestore(&hostdata->lock, flags); 906 break; 907 908 case CSR_XFER_DONE | PHS_STATUS: 909 case CSR_UNEXP | PHS_STATUS: 910 case CSR_SRV_REQ | PHS_STATUS: 911 DB(DB_INTR, printk("STATUS=")) 912 scsi_pointer->Status = read_1_byte(regs); 913 DB(DB_INTR, printk("%02x", scsi_pointer->Status)) 914 if (hostdata->level2 >= L2_BASIC) { 915 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ 916 udelay(7); 917 hostdata->state = S_RUNNING_LEVEL2; 918 write_wd33c93(regs, WD_COMMAND_PHASE, 0x50); 919 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 920 } else { 921 hostdata->state = S_CONNECTED; 922 } 923 spin_unlock_irqrestore(&hostdata->lock, flags); 924 break; 925 926 case CSR_XFER_DONE | PHS_MESS_IN: 927 case CSR_UNEXP | PHS_MESS_IN: 928 case CSR_SRV_REQ | PHS_MESS_IN: 929 DB(DB_INTR, printk("MSG_IN=")) 930 931 msg = read_1_byte(regs); 932 sr = read_wd33c93(regs, WD_SCSI_STATUS); /* clear interrupt */ 933 udelay(7); 934 935 hostdata->incoming_msg[hostdata->incoming_ptr] = msg; 936 if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE) 937 msg = EXTENDED_MESSAGE; 938 else 939 hostdata->incoming_ptr = 0; 940 941 scsi_pointer->Message = msg; 942 switch (msg) { 943 944 case COMMAND_COMPLETE: 945 DB(DB_INTR, printk("CCMP")) 946 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 947 hostdata->state = S_PRE_CMP_DISC; 948 break; 949 950 case SAVE_POINTERS: 951 DB(DB_INTR, printk("SDP")) 952 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 953 hostdata->state = S_CONNECTED; 954 break; 955 956 case RESTORE_POINTERS: 957 DB(DB_INTR, printk("RDP")) 958 if (hostdata->level2 >= L2_BASIC) { 959 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 960 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 961 hostdata->state = S_RUNNING_LEVEL2; 962 } else { 963 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 964 hostdata->state = S_CONNECTED; 965 } 966 break; 967 968 case DISCONNECT: 969 DB(DB_INTR, printk("DIS")) 970 cmd->device->disconnect = 1; 971 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 972 hostdata->state = S_PRE_TMP_DISC; 973 break; 974 975 case MESSAGE_REJECT: 976 DB(DB_INTR, printk("REJ")) 977 #ifdef SYNC_DEBUG 978 printk("-REJ-"); 979 #endif 980 if (hostdata->sync_stat[cmd->device->id] == SS_WAITING) { 981 hostdata->sync_stat[cmd->device->id] = SS_SET; 982 /* we want default_sx_per, not DEFAULT_SX_PER */ 983 hostdata->sync_xfer[cmd->device->id] = 984 calc_sync_xfer(hostdata->default_sx_per 985 / 4, 0, 0, hostdata->sx_table); 986 } 987 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 988 hostdata->state = S_CONNECTED; 989 break; 990 991 case EXTENDED_MESSAGE: 992 DB(DB_INTR, printk("EXT")) 993 994 ucp = hostdata->incoming_msg; 995 996 #ifdef SYNC_DEBUG 997 printk("%02x", ucp[hostdata->incoming_ptr]); 998 #endif 999 /* Is this the last byte of the extended message? */ 1000 1001 if ((hostdata->incoming_ptr >= 2) && 1002 (hostdata->incoming_ptr == (ucp[1] + 1))) { 1003 1004 switch (ucp[2]) { /* what's the EXTENDED code? */ 1005 case EXTENDED_SDTR: 1006 /* default to default async period */ 1007 id = calc_sync_xfer(hostdata-> 1008 default_sx_per / 4, 0, 1009 0, hostdata->sx_table); 1010 if (hostdata->sync_stat[cmd->device->id] != 1011 SS_WAITING) { 1012 1013 /* A device has sent an unsolicited SDTR message; rather than go 1014 * through the effort of decoding it and then figuring out what 1015 * our reply should be, we're just gonna say that we have a 1016 * synchronous fifo depth of 0. This will result in asynchronous 1017 * transfers - not ideal but so much easier. 1018 * Actually, this is OK because it assures us that if we don't 1019 * specifically ask for sync transfers, we won't do any. 1020 */ 1021 1022 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1023 hostdata->outgoing_msg[0] = 1024 EXTENDED_MESSAGE; 1025 hostdata->outgoing_msg[1] = 3; 1026 hostdata->outgoing_msg[2] = 1027 EXTENDED_SDTR; 1028 calc_sync_msg(hostdata-> 1029 default_sx_per, 0, 1030 0, hostdata->outgoing_msg + 3); 1031 hostdata->outgoing_len = 5; 1032 } else { 1033 if (ucp[4]) /* well, sync transfer */ 1034 id = calc_sync_xfer(ucp[3], ucp[4], 1035 hostdata->fast, 1036 hostdata->sx_table); 1037 else if (ucp[3]) /* very unlikely... */ 1038 id = calc_sync_xfer(ucp[3], ucp[4], 1039 0, hostdata->sx_table); 1040 } 1041 hostdata->sync_xfer[cmd->device->id] = id; 1042 #ifdef SYNC_DEBUG 1043 printk(" sync_xfer=%02x\n", 1044 hostdata->sync_xfer[cmd->device->id]); 1045 #endif 1046 hostdata->sync_stat[cmd->device->id] = 1047 SS_SET; 1048 write_wd33c93_cmd(regs, 1049 WD_CMD_NEGATE_ACK); 1050 hostdata->state = S_CONNECTED; 1051 break; 1052 case EXTENDED_WDTR: 1053 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1054 printk("sending WDTR "); 1055 hostdata->outgoing_msg[0] = 1056 EXTENDED_MESSAGE; 1057 hostdata->outgoing_msg[1] = 2; 1058 hostdata->outgoing_msg[2] = 1059 EXTENDED_WDTR; 1060 hostdata->outgoing_msg[3] = 0; /* 8 bit transfer width */ 1061 hostdata->outgoing_len = 4; 1062 write_wd33c93_cmd(regs, 1063 WD_CMD_NEGATE_ACK); 1064 hostdata->state = S_CONNECTED; 1065 break; 1066 default: 1067 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1068 printk 1069 ("Rejecting Unknown Extended Message(%02x). ", 1070 ucp[2]); 1071 hostdata->outgoing_msg[0] = 1072 MESSAGE_REJECT; 1073 hostdata->outgoing_len = 1; 1074 write_wd33c93_cmd(regs, 1075 WD_CMD_NEGATE_ACK); 1076 hostdata->state = S_CONNECTED; 1077 break; 1078 } 1079 hostdata->incoming_ptr = 0; 1080 } 1081 1082 /* We need to read more MESS_IN bytes for the extended message */ 1083 1084 else { 1085 hostdata->incoming_ptr++; 1086 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1087 hostdata->state = S_CONNECTED; 1088 } 1089 break; 1090 1091 default: 1092 printk("Rejecting Unknown Message(%02x) ", msg); 1093 write_wd33c93_cmd(regs, WD_CMD_ASSERT_ATN); /* want MESS_OUT */ 1094 hostdata->outgoing_msg[0] = MESSAGE_REJECT; 1095 hostdata->outgoing_len = 1; 1096 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1097 hostdata->state = S_CONNECTED; 1098 } 1099 spin_unlock_irqrestore(&hostdata->lock, flags); 1100 break; 1101 1102 /* Note: this interrupt will occur only after a LEVEL2 command */ 1103 1104 case CSR_SEL_XFER_DONE: 1105 1106 /* Make sure that reselection is enabled at this point - it may 1107 * have been turned off for the command that just completed. 1108 */ 1109 1110 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1111 if (phs == 0x60) { 1112 DB(DB_INTR, printk("SX-DONE")) 1113 scsi_pointer->Message = COMMAND_COMPLETE; 1114 lun = read_wd33c93(regs, WD_TARGET_LUN); 1115 DB(DB_INTR, printk(":%d.%d", scsi_pointer->Status, lun)) 1116 hostdata->connected = NULL; 1117 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); 1118 hostdata->state = S_UNCONNECTED; 1119 if (scsi_pointer->Status == ILLEGAL_STATUS_BYTE) 1120 scsi_pointer->Status = lun; 1121 if (cmd->cmnd[0] == REQUEST_SENSE 1122 && scsi_pointer->Status != SAM_STAT_GOOD) { 1123 set_host_byte(cmd, DID_ERROR); 1124 } else { 1125 set_host_byte(cmd, DID_OK); 1126 scsi_msg_to_host_byte(cmd, scsi_pointer->Message); 1127 set_status_byte(cmd, scsi_pointer->Status); 1128 } 1129 scsi_done(cmd); 1130 1131 /* We are no longer connected to a target - check to see if 1132 * there are commands waiting to be executed. 1133 */ 1134 spin_unlock_irqrestore(&hostdata->lock, flags); 1135 wd33c93_execute(instance); 1136 } else { 1137 printk 1138 ("%02x:%02x:%02x: Unknown SEL_XFER_DONE phase!!---", 1139 asr, sr, phs); 1140 spin_unlock_irqrestore(&hostdata->lock, flags); 1141 } 1142 break; 1143 1144 /* Note: this interrupt will occur only after a LEVEL2 command */ 1145 1146 case CSR_SDP: 1147 DB(DB_INTR, printk("SDP")) 1148 hostdata->state = S_RUNNING_LEVEL2; 1149 write_wd33c93(regs, WD_COMMAND_PHASE, 0x41); 1150 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1151 spin_unlock_irqrestore(&hostdata->lock, flags); 1152 break; 1153 1154 case CSR_XFER_DONE | PHS_MESS_OUT: 1155 case CSR_UNEXP | PHS_MESS_OUT: 1156 case CSR_SRV_REQ | PHS_MESS_OUT: 1157 DB(DB_INTR, printk("MSG_OUT=")) 1158 1159 /* To get here, we've probably requested MESSAGE_OUT and have 1160 * already put the correct bytes in outgoing_msg[] and filled 1161 * in outgoing_len. We simply send them out to the SCSI bus. 1162 * Sometimes we get MESSAGE_OUT phase when we're not expecting 1163 * it - like when our SDTR message is rejected by a target. Some 1164 * targets send the REJECT before receiving all of the extended 1165 * message, and then seem to go back to MESSAGE_OUT for a byte 1166 * or two. Not sure why, or if I'm doing something wrong to 1167 * cause this to happen. Regardless, it seems that sending 1168 * NOP messages in these situations results in no harm and 1169 * makes everyone happy. 1170 */ 1171 if (hostdata->outgoing_len == 0) { 1172 hostdata->outgoing_len = 1; 1173 hostdata->outgoing_msg[0] = NOP; 1174 } 1175 transfer_pio(regs, hostdata->outgoing_msg, 1176 hostdata->outgoing_len, DATA_OUT_DIR, hostdata); 1177 DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0])) 1178 hostdata->outgoing_len = 0; 1179 hostdata->state = S_CONNECTED; 1180 spin_unlock_irqrestore(&hostdata->lock, flags); 1181 break; 1182 1183 case CSR_UNEXP_DISC: 1184 1185 /* I think I've seen this after a request-sense that was in response 1186 * to an error condition, but not sure. We certainly need to do 1187 * something when we get this interrupt - the question is 'what?'. 1188 * Let's think positively, and assume some command has finished 1189 * in a legal manner (like a command that provokes a request-sense), 1190 * so we treat it as a normal command-complete-disconnect. 1191 */ 1192 1193 /* Make sure that reselection is enabled at this point - it may 1194 * have been turned off for the command that just completed. 1195 */ 1196 1197 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1198 if (cmd == NULL) { 1199 printk(" - Already disconnected! "); 1200 hostdata->state = S_UNCONNECTED; 1201 spin_unlock_irqrestore(&hostdata->lock, flags); 1202 return; 1203 } 1204 DB(DB_INTR, printk("UNEXP_DISC")) 1205 hostdata->connected = NULL; 1206 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); 1207 hostdata->state = S_UNCONNECTED; 1208 if (cmd->cmnd[0] == REQUEST_SENSE && 1209 scsi_pointer->Status != SAM_STAT_GOOD) { 1210 set_host_byte(cmd, DID_ERROR); 1211 } else { 1212 set_host_byte(cmd, DID_OK); 1213 scsi_msg_to_host_byte(cmd, scsi_pointer->Message); 1214 set_status_byte(cmd, scsi_pointer->Status); 1215 } 1216 scsi_done(cmd); 1217 1218 /* We are no longer connected to a target - check to see if 1219 * there are commands waiting to be executed. 1220 */ 1221 /* look above for comments on scsi_done() */ 1222 spin_unlock_irqrestore(&hostdata->lock, flags); 1223 wd33c93_execute(instance); 1224 break; 1225 1226 case CSR_DISC: 1227 1228 /* Make sure that reselection is enabled at this point - it may 1229 * have been turned off for the command that just completed. 1230 */ 1231 1232 write_wd33c93(regs, WD_SOURCE_ID, SRCID_ER); 1233 DB(DB_INTR, printk("DISC")) 1234 if (cmd == NULL) { 1235 printk(" - Already disconnected! "); 1236 hostdata->state = S_UNCONNECTED; 1237 } 1238 switch (hostdata->state) { 1239 case S_PRE_CMP_DISC: 1240 hostdata->connected = NULL; 1241 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); 1242 hostdata->state = S_UNCONNECTED; 1243 DB(DB_INTR, printk(":%d", scsi_pointer->Status)) 1244 if (cmd->cmnd[0] == REQUEST_SENSE 1245 && scsi_pointer->Status != SAM_STAT_GOOD) { 1246 set_host_byte(cmd, DID_ERROR); 1247 } else { 1248 set_host_byte(cmd, DID_OK); 1249 scsi_msg_to_host_byte(cmd, scsi_pointer->Message); 1250 set_status_byte(cmd, scsi_pointer->Status); 1251 } 1252 scsi_done(cmd); 1253 break; 1254 case S_PRE_TMP_DISC: 1255 case S_RUNNING_LEVEL2: 1256 cmd->host_scribble = (uchar *) hostdata->disconnected_Q; 1257 hostdata->disconnected_Q = cmd; 1258 hostdata->connected = NULL; 1259 hostdata->state = S_UNCONNECTED; 1260 1261 #ifdef PROC_STATISTICS 1262 hostdata->disc_done_cnt[cmd->device->id]++; 1263 #endif 1264 1265 break; 1266 default: 1267 printk("*** Unexpected DISCONNECT interrupt! ***"); 1268 hostdata->state = S_UNCONNECTED; 1269 } 1270 1271 /* We are no longer connected to a target - check to see if 1272 * there are commands waiting to be executed. 1273 */ 1274 spin_unlock_irqrestore(&hostdata->lock, flags); 1275 wd33c93_execute(instance); 1276 break; 1277 1278 case CSR_RESEL_AM: 1279 case CSR_RESEL: 1280 DB(DB_INTR, printk("RESEL%s", sr == CSR_RESEL_AM ? "_AM" : "")) 1281 1282 /* Old chips (pre -A ???) don't have advanced features and will 1283 * generate CSR_RESEL. In that case we have to extract the LUN the 1284 * hard way (see below). 1285 * First we have to make sure this reselection didn't 1286 * happen during Arbitration/Selection of some other device. 1287 * If yes, put losing command back on top of input_Q. 1288 */ 1289 if (hostdata->level2 <= L2_NONE) { 1290 1291 if (hostdata->selecting) { 1292 cmd = (struct scsi_cmnd *) hostdata->selecting; 1293 hostdata->selecting = NULL; 1294 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); 1295 cmd->host_scribble = 1296 (uchar *) hostdata->input_Q; 1297 hostdata->input_Q = cmd; 1298 } 1299 } 1300 1301 else { 1302 1303 if (cmd) { 1304 if (phs == 0x00) { 1305 hostdata->busy[cmd->device->id] &= 1306 ~(1 << (cmd->device->lun & 0xff)); 1307 cmd->host_scribble = 1308 (uchar *) hostdata->input_Q; 1309 hostdata->input_Q = cmd; 1310 } else { 1311 printk 1312 ("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---", 1313 asr, sr, phs); 1314 while (1) 1315 printk("\r"); 1316 } 1317 } 1318 1319 } 1320 1321 /* OK - find out which device reselected us. */ 1322 1323 id = read_wd33c93(regs, WD_SOURCE_ID); 1324 id &= SRCID_MASK; 1325 1326 /* and extract the lun from the ID message. (Note that we don't 1327 * bother to check for a valid message here - I guess this is 1328 * not the right way to go, but...) 1329 */ 1330 1331 if (sr == CSR_RESEL_AM) { 1332 lun = read_wd33c93(regs, WD_DATA); 1333 if (hostdata->level2 < L2_RESELECT) 1334 write_wd33c93_cmd(regs, WD_CMD_NEGATE_ACK); 1335 lun &= 7; 1336 } else { 1337 /* Old chip; wait for msgin phase to pick up the LUN. */ 1338 for (lun = 255; lun; lun--) { 1339 if ((asr = read_aux_stat(regs)) & ASR_INT) 1340 break; 1341 udelay(10); 1342 } 1343 if (!(asr & ASR_INT)) { 1344 printk 1345 ("wd33c93: Reselected without IDENTIFY\n"); 1346 lun = 0; 1347 } else { 1348 /* Verify this is a change to MSG_IN and read the message */ 1349 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1350 udelay(7); 1351 if (sr == (CSR_ABORT | PHS_MESS_IN) || 1352 sr == (CSR_UNEXP | PHS_MESS_IN) || 1353 sr == (CSR_SRV_REQ | PHS_MESS_IN)) { 1354 /* Got MSG_IN, grab target LUN */ 1355 lun = read_1_byte(regs); 1356 /* Now we expect a 'paused with ACK asserted' int.. */ 1357 asr = read_aux_stat(regs); 1358 if (!(asr & ASR_INT)) { 1359 udelay(10); 1360 asr = read_aux_stat(regs); 1361 if (!(asr & ASR_INT)) 1362 printk 1363 ("wd33c93: No int after LUN on RESEL (%02x)\n", 1364 asr); 1365 } 1366 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1367 udelay(7); 1368 if (sr != CSR_MSGIN) 1369 printk 1370 ("wd33c93: Not paused with ACK on RESEL (%02x)\n", 1371 sr); 1372 lun &= 7; 1373 write_wd33c93_cmd(regs, 1374 WD_CMD_NEGATE_ACK); 1375 } else { 1376 printk 1377 ("wd33c93: Not MSG_IN on reselect (%02x)\n", 1378 sr); 1379 lun = 0; 1380 } 1381 } 1382 } 1383 1384 /* Now we look for the command that's reconnecting. */ 1385 1386 cmd = (struct scsi_cmnd *) hostdata->disconnected_Q; 1387 patch = NULL; 1388 while (cmd) { 1389 if (id == cmd->device->id && lun == (u8)cmd->device->lun) 1390 break; 1391 patch = cmd; 1392 cmd = (struct scsi_cmnd *) cmd->host_scribble; 1393 } 1394 1395 /* Hmm. Couldn't find a valid command.... What to do? */ 1396 1397 if (!cmd) { 1398 printk 1399 ("---TROUBLE: target %d.%d not in disconnect queue---", 1400 id, (u8)lun); 1401 spin_unlock_irqrestore(&hostdata->lock, flags); 1402 return; 1403 } 1404 1405 /* Ok, found the command - now start it up again. */ 1406 1407 if (patch) 1408 patch->host_scribble = cmd->host_scribble; 1409 else 1410 hostdata->disconnected_Q = 1411 (struct scsi_cmnd *) cmd->host_scribble; 1412 hostdata->connected = cmd; 1413 1414 /* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]' 1415 * because these things are preserved over a disconnect. 1416 * But we DO need to fix the DPD bit so it's correct for this command. 1417 */ 1418 1419 if (cmd->sc_data_direction == DMA_TO_DEVICE) 1420 write_wd33c93(regs, WD_DESTINATION_ID, cmd->device->id); 1421 else 1422 write_wd33c93(regs, WD_DESTINATION_ID, 1423 cmd->device->id | DSTID_DPD); 1424 if (hostdata->level2 >= L2_RESELECT) { 1425 write_wd33c93_count(regs, 0); /* we want a DATA_PHASE interrupt */ 1426 write_wd33c93(regs, WD_COMMAND_PHASE, 0x45); 1427 write_wd33c93_cmd(regs, WD_CMD_SEL_ATN_XFER); 1428 hostdata->state = S_RUNNING_LEVEL2; 1429 } else 1430 hostdata->state = S_CONNECTED; 1431 1432 spin_unlock_irqrestore(&hostdata->lock, flags); 1433 break; 1434 1435 default: 1436 printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs); 1437 spin_unlock_irqrestore(&hostdata->lock, flags); 1438 } 1439 1440 DB(DB_INTR, printk("} ")) 1441 1442 } 1443 1444 static void 1445 reset_wd33c93(struct Scsi_Host *instance) 1446 { 1447 struct WD33C93_hostdata *hostdata = 1448 (struct WD33C93_hostdata *) instance->hostdata; 1449 const wd33c93_regs regs = hostdata->regs; 1450 uchar sr; 1451 1452 #ifdef CONFIG_SGI_IP22 1453 { 1454 int busycount = 0; 1455 extern void sgiwd93_reset(unsigned long); 1456 /* wait 'til the chip gets some time for us */ 1457 while ((read_aux_stat(regs) & ASR_BSY) && busycount++ < 100) 1458 udelay (10); 1459 /* 1460 * there are scsi devices out there, which manage to lock up 1461 * the wd33c93 in a busy condition. In this state it won't 1462 * accept the reset command. The only way to solve this is to 1463 * give the chip a hardware reset (if possible). The code below 1464 * does this for the SGI Indy, where this is possible 1465 */ 1466 /* still busy ? */ 1467 if (read_aux_stat(regs) & ASR_BSY) 1468 sgiwd93_reset(instance->base); /* yeah, give it the hard one */ 1469 } 1470 #endif 1471 1472 write_wd33c93(regs, WD_OWN_ID, OWNID_EAF | OWNID_RAF | 1473 instance->this_id | hostdata->clock_freq); 1474 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1475 write_wd33c93(regs, WD_SYNCHRONOUS_TRANSFER, 1476 calc_sync_xfer(hostdata->default_sx_per / 4, 1477 DEFAULT_SX_OFF, 0, hostdata->sx_table)); 1478 write_wd33c93(regs, WD_COMMAND, WD_CMD_RESET); 1479 1480 1481 #ifdef CONFIG_MVME147_SCSI 1482 udelay(25); /* The old wd33c93 on MVME147 needs this, at least */ 1483 #endif 1484 1485 while (!(read_aux_stat(regs) & ASR_INT)) 1486 ; 1487 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1488 1489 hostdata->microcode = read_wd33c93(regs, WD_CDB_1); 1490 if (sr == 0x00) 1491 hostdata->chip = C_WD33C93; 1492 else if (sr == 0x01) { 1493 write_wd33c93(regs, WD_QUEUE_TAG, 0xa5); /* any random number */ 1494 sr = read_wd33c93(regs, WD_QUEUE_TAG); 1495 if (sr == 0xa5) { 1496 hostdata->chip = C_WD33C93B; 1497 write_wd33c93(regs, WD_QUEUE_TAG, 0); 1498 } else 1499 hostdata->chip = C_WD33C93A; 1500 } else 1501 hostdata->chip = C_UNKNOWN_CHIP; 1502 1503 if (hostdata->chip != C_WD33C93B) /* Fast SCSI unavailable */ 1504 hostdata->fast = 0; 1505 1506 write_wd33c93(regs, WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE); 1507 write_wd33c93(regs, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1508 } 1509 1510 int 1511 wd33c93_host_reset(struct scsi_cmnd * SCpnt) 1512 { 1513 struct Scsi_Host *instance; 1514 struct WD33C93_hostdata *hostdata; 1515 int i; 1516 1517 instance = SCpnt->device->host; 1518 spin_lock_irq(instance->host_lock); 1519 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1520 1521 printk("scsi%d: reset. ", instance->host_no); 1522 disable_irq(instance->irq); 1523 1524 hostdata->dma_stop(instance, NULL, 0); 1525 for (i = 0; i < 8; i++) { 1526 hostdata->busy[i] = 0; 1527 hostdata->sync_xfer[i] = 1528 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF, 1529 0, hostdata->sx_table); 1530 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ 1531 } 1532 hostdata->input_Q = NULL; 1533 hostdata->selecting = NULL; 1534 hostdata->connected = NULL; 1535 hostdata->disconnected_Q = NULL; 1536 hostdata->state = S_UNCONNECTED; 1537 hostdata->dma = D_DMA_OFF; 1538 hostdata->incoming_ptr = 0; 1539 hostdata->outgoing_len = 0; 1540 1541 reset_wd33c93(instance); 1542 SCpnt->result = DID_RESET << 16; 1543 enable_irq(instance->irq); 1544 spin_unlock_irq(instance->host_lock); 1545 return SUCCESS; 1546 } 1547 1548 int 1549 wd33c93_abort(struct scsi_cmnd * cmd) 1550 { 1551 struct Scsi_Host *instance; 1552 struct WD33C93_hostdata *hostdata; 1553 wd33c93_regs regs; 1554 struct scsi_cmnd *tmp, *prev; 1555 1556 disable_irq(cmd->device->host->irq); 1557 1558 instance = cmd->device->host; 1559 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1560 regs = hostdata->regs; 1561 1562 /* 1563 * Case 1 : If the command hasn't been issued yet, we simply remove it 1564 * from the input_Q. 1565 */ 1566 1567 tmp = (struct scsi_cmnd *) hostdata->input_Q; 1568 prev = NULL; 1569 while (tmp) { 1570 if (tmp == cmd) { 1571 if (prev) 1572 prev->host_scribble = cmd->host_scribble; 1573 else 1574 hostdata->input_Q = 1575 (struct scsi_cmnd *) cmd->host_scribble; 1576 cmd->host_scribble = NULL; 1577 cmd->result = DID_ABORT << 16; 1578 printk 1579 ("scsi%d: Abort - removing command from input_Q. ", 1580 instance->host_no); 1581 enable_irq(cmd->device->host->irq); 1582 scsi_done(cmd); 1583 return SUCCESS; 1584 } 1585 prev = tmp; 1586 tmp = (struct scsi_cmnd *) tmp->host_scribble; 1587 } 1588 1589 /* 1590 * Case 2 : If the command is connected, we're going to fail the abort 1591 * and let the high level SCSI driver retry at a later time or 1592 * issue a reset. 1593 * 1594 * Timeouts, and therefore aborted commands, will be highly unlikely 1595 * and handling them cleanly in this situation would make the common 1596 * case of noresets less efficient, and would pollute our code. So, 1597 * we fail. 1598 */ 1599 1600 if (hostdata->connected == cmd) { 1601 uchar sr, asr; 1602 unsigned long timeout; 1603 1604 printk("scsi%d: Aborting connected command - ", 1605 instance->host_no); 1606 1607 printk("stopping DMA - "); 1608 if (hostdata->dma == D_DMA_RUNNING) { 1609 hostdata->dma_stop(instance, cmd, 0); 1610 hostdata->dma = D_DMA_OFF; 1611 } 1612 1613 printk("sending wd33c93 ABORT command - "); 1614 write_wd33c93(regs, WD_CONTROL, 1615 CTRL_IDI | CTRL_EDI | CTRL_POLLED); 1616 write_wd33c93_cmd(regs, WD_CMD_ABORT); 1617 1618 /* Now we have to attempt to flush out the FIFO... */ 1619 1620 printk("flushing fifo - "); 1621 timeout = 1000000; 1622 do { 1623 asr = read_aux_stat(regs); 1624 if (asr & ASR_DBR) 1625 read_wd33c93(regs, WD_DATA); 1626 } while (!(asr & ASR_INT) && timeout-- > 0); 1627 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1628 printk 1629 ("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ", 1630 asr, sr, read_wd33c93_count(regs), timeout); 1631 1632 /* 1633 * Abort command processed. 1634 * Still connected. 1635 * We must disconnect. 1636 */ 1637 1638 printk("sending wd33c93 DISCONNECT command - "); 1639 write_wd33c93_cmd(regs, WD_CMD_DISCONNECT); 1640 1641 timeout = 1000000; 1642 asr = read_aux_stat(regs); 1643 while ((asr & ASR_CIP) && timeout-- > 0) 1644 asr = read_aux_stat(regs); 1645 sr = read_wd33c93(regs, WD_SCSI_STATUS); 1646 printk("asr=%02x, sr=%02x.", asr, sr); 1647 1648 hostdata->busy[cmd->device->id] &= ~(1 << (cmd->device->lun & 0xff)); 1649 hostdata->connected = NULL; 1650 hostdata->state = S_UNCONNECTED; 1651 cmd->result = DID_ABORT << 16; 1652 1653 /* sti();*/ 1654 wd33c93_execute(instance); 1655 1656 enable_irq(cmd->device->host->irq); 1657 scsi_done(cmd); 1658 return SUCCESS; 1659 } 1660 1661 /* 1662 * Case 3: If the command is currently disconnected from the bus, 1663 * we're not going to expend much effort here: Let's just return 1664 * an ABORT_SNOOZE and hope for the best... 1665 */ 1666 1667 tmp = (struct scsi_cmnd *) hostdata->disconnected_Q; 1668 while (tmp) { 1669 if (tmp == cmd) { 1670 printk 1671 ("scsi%d: Abort - command found on disconnected_Q - ", 1672 instance->host_no); 1673 printk("Abort SNOOZE. "); 1674 enable_irq(cmd->device->host->irq); 1675 return FAILED; 1676 } 1677 tmp = (struct scsi_cmnd *) tmp->host_scribble; 1678 } 1679 1680 /* 1681 * Case 4 : If we reached this point, the command was not found in any of 1682 * the queues. 1683 * 1684 * We probably reached this point because of an unlikely race condition 1685 * between the command completing successfully and the abortion code, 1686 * so we won't panic, but we will notify the user in case something really 1687 * broke. 1688 */ 1689 1690 /* sti();*/ 1691 wd33c93_execute(instance); 1692 1693 enable_irq(cmd->device->host->irq); 1694 printk("scsi%d: warning : SCSI command probably completed successfully" 1695 " before abortion. ", instance->host_no); 1696 return FAILED; 1697 } 1698 1699 #define MAX_WD33C93_HOSTS 4 1700 #define MAX_SETUP_ARGS ARRAY_SIZE(setup_args) 1701 #define SETUP_BUFFER_SIZE 200 1702 static char setup_buffer[SETUP_BUFFER_SIZE]; 1703 static char setup_used[MAX_SETUP_ARGS]; 1704 static int done_setup = 0; 1705 1706 static int 1707 wd33c93_setup(char *str) 1708 { 1709 int i; 1710 char *p1, *p2; 1711 1712 /* The kernel does some processing of the command-line before calling 1713 * this function: If it begins with any decimal or hex number arguments, 1714 * ints[0] = how many numbers found and ints[1] through [n] are the values 1715 * themselves. str points to where the non-numeric arguments (if any) 1716 * start: We do our own parsing of those. We construct synthetic 'nosync' 1717 * keywords out of numeric args (to maintain compatibility with older 1718 * versions) and then add the rest of the arguments. 1719 */ 1720 1721 p1 = setup_buffer; 1722 *p1 = '\0'; 1723 if (str) 1724 strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer)); 1725 setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0'; 1726 p1 = setup_buffer; 1727 i = 0; 1728 while (*p1 && (i < MAX_SETUP_ARGS)) { 1729 p2 = strchr(p1, ','); 1730 if (p2) { 1731 *p2 = '\0'; 1732 if (p1 != p2) 1733 setup_args[i] = p1; 1734 p1 = p2 + 1; 1735 i++; 1736 } else { 1737 setup_args[i] = p1; 1738 break; 1739 } 1740 } 1741 for (i = 0; i < MAX_SETUP_ARGS; i++) 1742 setup_used[i] = 0; 1743 done_setup = 1; 1744 1745 return 1; 1746 } 1747 __setup("wd33c93=", wd33c93_setup); 1748 1749 /* check_setup_args() returns index if key found, 0 if not 1750 */ 1751 static int 1752 check_setup_args(char *key, int *flags, int *val, char *buf) 1753 { 1754 int x; 1755 char *cp; 1756 1757 for (x = 0; x < MAX_SETUP_ARGS; x++) { 1758 if (setup_used[x]) 1759 continue; 1760 if (!strncmp(setup_args[x], key, strlen(key))) 1761 break; 1762 if (!strncmp(setup_args[x], "next", strlen("next"))) 1763 return 0; 1764 } 1765 if (x == MAX_SETUP_ARGS) 1766 return 0; 1767 setup_used[x] = 1; 1768 cp = setup_args[x] + strlen(key); 1769 *val = -1; 1770 if (*cp != ':') 1771 return ++x; 1772 cp++; 1773 if ((*cp >= '0') && (*cp <= '9')) { 1774 *val = simple_strtoul(cp, NULL, 0); 1775 } 1776 return ++x; 1777 } 1778 1779 /* 1780 * Calculate internal data-transfer-clock cycle from input-clock 1781 * frequency (/MHz) and fill 'sx_table'. 1782 * 1783 * The original driver used to rely on a fixed sx_table, containing periods 1784 * for (only) the lower limits of the respective input-clock-frequency ranges 1785 * (8-10/12-15/16-20 MHz). Although it seems, that no problems occurred with 1786 * this setting so far, it might be desirable to adjust the transfer periods 1787 * closer to the really attached, possibly 25% higher, input-clock, since 1788 * - the wd33c93 may really use a significant shorter period, than it has 1789 * negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz 1790 * instead). 1791 * - the wd33c93 may ask the target for a lower transfer rate, than the target 1792 * is capable of (eg. negotiating for an assumed minimum of 252ns instead of 1793 * possible 200ns, which indeed shows up in tests as an approx. 10% lower 1794 * transfer rate). 1795 */ 1796 static inline unsigned int 1797 round_4(unsigned int x) 1798 { 1799 switch (x & 3) { 1800 case 1: --x; 1801 break; 1802 case 2: ++x; 1803 fallthrough; 1804 case 3: ++x; 1805 } 1806 return x; 1807 } 1808 1809 static void 1810 calc_sx_table(unsigned int mhz, struct sx_period sx_table[9]) 1811 { 1812 unsigned int d, i; 1813 if (mhz < 11) 1814 d = 2; /* divisor for 8-10 MHz input-clock */ 1815 else if (mhz < 16) 1816 d = 3; /* divisor for 12-15 MHz input-clock */ 1817 else 1818 d = 4; /* divisor for 16-20 MHz input-clock */ 1819 1820 d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */ 1821 1822 sx_table[0].period_ns = 1; 1823 sx_table[0].reg_value = 0x20; 1824 for (i = 1; i < 8; i++) { 1825 sx_table[i].period_ns = round_4((i+1)*d / 100); 1826 sx_table[i].reg_value = (i+1)*0x10; 1827 } 1828 sx_table[7].reg_value = 0; 1829 sx_table[8].period_ns = 0; 1830 sx_table[8].reg_value = 0; 1831 } 1832 1833 /* 1834 * check and, maybe, map an init- or "clock:"- argument. 1835 */ 1836 static uchar 1837 set_clk_freq(int freq, int *mhz) 1838 { 1839 int x = freq; 1840 if (WD33C93_FS_8_10 == freq) 1841 freq = 8; 1842 else if (WD33C93_FS_12_15 == freq) 1843 freq = 12; 1844 else if (WD33C93_FS_16_20 == freq) 1845 freq = 16; 1846 else if (freq > 7 && freq < 11) 1847 x = WD33C93_FS_8_10; 1848 else if (freq > 11 && freq < 16) 1849 x = WD33C93_FS_12_15; 1850 else if (freq > 15 && freq < 21) 1851 x = WD33C93_FS_16_20; 1852 else { 1853 /* Hmm, wouldn't it be safer to assume highest freq here? */ 1854 x = WD33C93_FS_8_10; 1855 freq = 8; 1856 } 1857 *mhz = freq; 1858 return x; 1859 } 1860 1861 /* 1862 * to be used with the resync: fast: ... options 1863 */ 1864 static inline void set_resync ( struct WD33C93_hostdata *hd, int mask ) 1865 { 1866 int i; 1867 for (i = 0; i < 8; i++) 1868 if (mask & (1 << i)) 1869 hd->sync_stat[i] = SS_UNSET; 1870 } 1871 1872 void 1873 wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs, 1874 dma_setup_t setup, dma_stop_t stop, int clock_freq) 1875 { 1876 struct WD33C93_hostdata *hostdata; 1877 int i; 1878 int flags; 1879 int val; 1880 char buf[32]; 1881 1882 if (!done_setup && setup_strings) 1883 wd33c93_setup(setup_strings); 1884 1885 hostdata = (struct WD33C93_hostdata *) instance->hostdata; 1886 1887 hostdata->regs = regs; 1888 hostdata->clock_freq = set_clk_freq(clock_freq, &i); 1889 calc_sx_table(i, hostdata->sx_table); 1890 hostdata->dma_setup = setup; 1891 hostdata->dma_stop = stop; 1892 hostdata->dma_bounce_buffer = NULL; 1893 hostdata->dma_bounce_len = 0; 1894 for (i = 0; i < 8; i++) { 1895 hostdata->busy[i] = 0; 1896 hostdata->sync_xfer[i] = 1897 calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF, 1898 0, hostdata->sx_table); 1899 hostdata->sync_stat[i] = SS_UNSET; /* using default sync values */ 1900 #ifdef PROC_STATISTICS 1901 hostdata->cmd_cnt[i] = 0; 1902 hostdata->disc_allowed_cnt[i] = 0; 1903 hostdata->disc_done_cnt[i] = 0; 1904 #endif 1905 } 1906 hostdata->input_Q = NULL; 1907 hostdata->selecting = NULL; 1908 hostdata->connected = NULL; 1909 hostdata->disconnected_Q = NULL; 1910 hostdata->state = S_UNCONNECTED; 1911 hostdata->dma = D_DMA_OFF; 1912 hostdata->level2 = L2_BASIC; 1913 hostdata->disconnect = DIS_ADAPTIVE; 1914 hostdata->args = DEBUG_DEFAULTS; 1915 hostdata->incoming_ptr = 0; 1916 hostdata->outgoing_len = 0; 1917 hostdata->default_sx_per = DEFAULT_SX_PER; 1918 hostdata->no_dma = 0; /* default is DMA enabled */ 1919 1920 #ifdef PROC_INTERFACE 1921 hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS | 1922 PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP; 1923 #ifdef PROC_STATISTICS 1924 hostdata->dma_cnt = 0; 1925 hostdata->pio_cnt = 0; 1926 hostdata->int_cnt = 0; 1927 #endif 1928 #endif 1929 1930 if (check_setup_args("clock", &flags, &val, buf)) { 1931 hostdata->clock_freq = set_clk_freq(val, &val); 1932 calc_sx_table(val, hostdata->sx_table); 1933 } 1934 1935 if (check_setup_args("nosync", &flags, &val, buf)) 1936 hostdata->no_sync = val; 1937 1938 if (check_setup_args("nodma", &flags, &val, buf)) 1939 hostdata->no_dma = (val == -1) ? 1 : val; 1940 1941 if (check_setup_args("period", &flags, &val, buf)) 1942 hostdata->default_sx_per = 1943 hostdata->sx_table[round_period((unsigned int) val, 1944 hostdata->sx_table)].period_ns; 1945 1946 if (check_setup_args("disconnect", &flags, &val, buf)) { 1947 if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS)) 1948 hostdata->disconnect = val; 1949 else 1950 hostdata->disconnect = DIS_ADAPTIVE; 1951 } 1952 1953 if (check_setup_args("level2", &flags, &val, buf)) 1954 hostdata->level2 = val; 1955 1956 if (check_setup_args("debug", &flags, &val, buf)) 1957 hostdata->args = val & DB_MASK; 1958 1959 if (check_setup_args("burst", &flags, &val, buf)) 1960 hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA; 1961 1962 if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */ 1963 && check_setup_args("fast", &flags, &val, buf)) 1964 hostdata->fast = !!val; 1965 1966 if ((i = check_setup_args("next", &flags, &val, buf))) { 1967 while (i) 1968 setup_used[--i] = 1; 1969 } 1970 #ifdef PROC_INTERFACE 1971 if (check_setup_args("proc", &flags, &val, buf)) 1972 hostdata->proc = val; 1973 #endif 1974 1975 spin_lock_irq(&hostdata->lock); 1976 reset_wd33c93(instance); 1977 spin_unlock_irq(&hostdata->lock); 1978 1979 printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d", 1980 instance->host_no, 1981 (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip == 1982 C_WD33C93A) ? 1983 "WD33c93A" : (hostdata->chip == 1984 C_WD33C93B) ? "WD33c93B" : "unknown", 1985 hostdata->microcode, hostdata->no_sync, hostdata->no_dma); 1986 #ifdef DEBUGGING_ON 1987 printk(" debug_flags=0x%02x\n", hostdata->args); 1988 #else 1989 printk(" debugging=OFF\n"); 1990 #endif 1991 printk(" setup_args="); 1992 for (i = 0; i < MAX_SETUP_ARGS; i++) 1993 printk("%s,", setup_args[i]); 1994 printk("\n"); 1995 printk(" Version %s - %s\n", WD33C93_VERSION, WD33C93_DATE); 1996 } 1997 1998 int wd33c93_write_info(struct Scsi_Host *instance, char *buf, int len) 1999 { 2000 #ifdef PROC_INTERFACE 2001 char *bp; 2002 struct WD33C93_hostdata *hd; 2003 int x; 2004 2005 hd = (struct WD33C93_hostdata *) instance->hostdata; 2006 2007 /* We accept the following 2008 * keywords (same format as command-line, but arguments are not optional): 2009 * debug 2010 * disconnect 2011 * period 2012 * resync 2013 * proc 2014 * nodma 2015 * level2 2016 * burst 2017 * fast 2018 * nosync 2019 */ 2020 2021 buf[len] = '\0'; 2022 for (bp = buf; *bp; ) { 2023 while (',' == *bp || ' ' == *bp) 2024 ++bp; 2025 if (!strncmp(bp, "debug:", 6)) { 2026 hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK; 2027 } else if (!strncmp(bp, "disconnect:", 11)) { 2028 x = simple_strtoul(bp+11, &bp, 0); 2029 if (x < DIS_NEVER || x > DIS_ALWAYS) 2030 x = DIS_ADAPTIVE; 2031 hd->disconnect = x; 2032 } else if (!strncmp(bp, "period:", 7)) { 2033 x = simple_strtoul(bp+7, &bp, 0); 2034 hd->default_sx_per = 2035 hd->sx_table[round_period((unsigned int) x, 2036 hd->sx_table)].period_ns; 2037 } else if (!strncmp(bp, "resync:", 7)) { 2038 set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0)); 2039 } else if (!strncmp(bp, "proc:", 5)) { 2040 hd->proc = simple_strtoul(bp+5, &bp, 0); 2041 } else if (!strncmp(bp, "nodma:", 6)) { 2042 hd->no_dma = simple_strtoul(bp+6, &bp, 0); 2043 } else if (!strncmp(bp, "level2:", 7)) { 2044 hd->level2 = simple_strtoul(bp+7, &bp, 0); 2045 } else if (!strncmp(bp, "burst:", 6)) { 2046 hd->dma_mode = 2047 simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA; 2048 } else if (!strncmp(bp, "fast:", 5)) { 2049 x = !!simple_strtol(bp+5, &bp, 0); 2050 if (x != hd->fast) 2051 set_resync(hd, 0xff); 2052 hd->fast = x; 2053 } else if (!strncmp(bp, "nosync:", 7)) { 2054 x = simple_strtoul(bp+7, &bp, 0); 2055 set_resync(hd, x ^ hd->no_sync); 2056 hd->no_sync = x; 2057 } else { 2058 break; /* unknown keyword,syntax-error,... */ 2059 } 2060 } 2061 return len; 2062 #else 2063 return 0; 2064 #endif 2065 } 2066 2067 int 2068 wd33c93_show_info(struct seq_file *m, struct Scsi_Host *instance) 2069 { 2070 #ifdef PROC_INTERFACE 2071 struct WD33C93_hostdata *hd; 2072 struct scsi_cmnd *cmd; 2073 int x; 2074 2075 hd = (struct WD33C93_hostdata *) instance->hostdata; 2076 2077 spin_lock_irq(&hd->lock); 2078 if (hd->proc & PR_VERSION) 2079 seq_printf(m, "\nVersion %s - %s.", 2080 WD33C93_VERSION, WD33C93_DATE); 2081 2082 if (hd->proc & PR_INFO) { 2083 seq_printf(m, "\nclock_freq=%02x no_sync=%02x no_dma=%d" 2084 " dma_mode=%02x fast=%d", 2085 hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast); 2086 seq_puts(m, "\nsync_xfer[] = "); 2087 for (x = 0; x < 7; x++) 2088 seq_printf(m, "\t%02x", hd->sync_xfer[x]); 2089 seq_puts(m, "\nsync_stat[] = "); 2090 for (x = 0; x < 7; x++) 2091 seq_printf(m, "\t%02x", hd->sync_stat[x]); 2092 } 2093 #ifdef PROC_STATISTICS 2094 if (hd->proc & PR_STATISTICS) { 2095 seq_puts(m, "\ncommands issued: "); 2096 for (x = 0; x < 7; x++) 2097 seq_printf(m, "\t%ld", hd->cmd_cnt[x]); 2098 seq_puts(m, "\ndisconnects allowed:"); 2099 for (x = 0; x < 7; x++) 2100 seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]); 2101 seq_puts(m, "\ndisconnects done: "); 2102 for (x = 0; x < 7; x++) 2103 seq_printf(m, "\t%ld", hd->disc_done_cnt[x]); 2104 seq_printf(m, 2105 "\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO", 2106 hd->int_cnt, hd->dma_cnt, hd->pio_cnt); 2107 } 2108 #endif 2109 if (hd->proc & PR_CONNECTED) { 2110 seq_puts(m, "\nconnected: "); 2111 if (hd->connected) { 2112 cmd = (struct scsi_cmnd *) hd->connected; 2113 seq_printf(m, " %d:%llu(%02x)", 2114 cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2115 } 2116 } 2117 if (hd->proc & PR_INPUTQ) { 2118 seq_puts(m, "\ninput_Q: "); 2119 cmd = (struct scsi_cmnd *) hd->input_Q; 2120 while (cmd) { 2121 seq_printf(m, " %d:%llu(%02x)", 2122 cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2123 cmd = (struct scsi_cmnd *) cmd->host_scribble; 2124 } 2125 } 2126 if (hd->proc & PR_DISCQ) { 2127 seq_puts(m, "\ndisconnected_Q:"); 2128 cmd = (struct scsi_cmnd *) hd->disconnected_Q; 2129 while (cmd) { 2130 seq_printf(m, " %d:%llu(%02x)", 2131 cmd->device->id, cmd->device->lun, cmd->cmnd[0]); 2132 cmd = (struct scsi_cmnd *) cmd->host_scribble; 2133 } 2134 } 2135 seq_putc(m, '\n'); 2136 spin_unlock_irq(&hd->lock); 2137 #endif /* PROC_INTERFACE */ 2138 return 0; 2139 } 2140 2141 EXPORT_SYMBOL(wd33c93_host_reset); 2142 EXPORT_SYMBOL(wd33c93_init); 2143 EXPORT_SYMBOL(wd33c93_abort); 2144 EXPORT_SYMBOL(wd33c93_queuecommand); 2145 EXPORT_SYMBOL(wd33c93_intr); 2146 EXPORT_SYMBOL(wd33c93_show_info); 2147 EXPORT_SYMBOL(wd33c93_write_info); 2148