ncr53c9x.c revision 1.13
1 /* $NetBSD: ncr53c9x.c,v 1.13 1997/07/20 16:46:17 pk Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Charles M. Hannum. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Charles M. Hannum. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1994 Peter Galbavy 34 * Copyright (c) 1995 Paul Kranenburg 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by Peter Galbavy 48 * 4. The name of the author may not be used to endorse or promote products 49 * derived from this software without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 53 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 54 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 55 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 56 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 57 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 60 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 61 * POSSIBILITY OF SUCH DAMAGE. 62 */ 63 64 /* 65 * Based on aic6360 by Jarle Greipsland 66 * 67 * Acknowledgements: Many of the algorithms used in this driver are 68 * inspired by the work of Julian Elischer (julian (at) tfs.com) and 69 * Charles Hannum (mycroft (at) duality.gnu.ai.mit.edu). Thanks a million! 70 */ 71 72 #include <sys/types.h> 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/kernel.h> 76 #include <sys/errno.h> 77 #include <sys/ioctl.h> 78 #include <sys/device.h> 79 #include <sys/buf.h> 80 #include <sys/proc.h> 81 #include <sys/user.h> 82 #include <sys/queue.h> 83 84 #include <scsi/scsi_all.h> 85 #include <scsi/scsiconf.h> 86 #include <scsi/scsi_message.h> 87 88 #include <machine/cpu.h> 89 90 #include <dev/ic/ncr53c9xreg.h> 91 #include <dev/ic/ncr53c9xvar.h> 92 93 int ncr53c9x_debug = 0; /*NCR_SHOWPHASE|NCR_SHOWMISC|NCR_SHOWTRAC|NCR_SHOWCMDS;*/ 94 95 /*static*/ void ncr53c9x_readregs __P((struct ncr53c9x_softc *)); 96 /*static*/ void ncr53c9x_select __P((struct ncr53c9x_softc *, 97 struct ncr53c9x_ecb *)); 98 /*static*/ int ncr53c9x_reselect __P((struct ncr53c9x_softc *, int)); 99 /*static*/ void ncr53c9x_scsi_reset __P((struct ncr53c9x_softc *)); 100 /*static*/ void ncr53c9x_init __P((struct ncr53c9x_softc *, int)); 101 /*static*/ int ncr53c9x_poll __P((struct ncr53c9x_softc *, 102 struct scsi_xfer *, int)); 103 /*static*/ void ncr53c9x_sched __P((struct ncr53c9x_softc *)); 104 /*static*/ void ncr53c9x_done __P((struct ncr53c9x_softc *, 105 struct ncr53c9x_ecb *)); 106 /*static*/ void ncr53c9x_msgin __P((struct ncr53c9x_softc *)); 107 /*static*/ void ncr53c9x_msgout __P((struct ncr53c9x_softc *)); 108 /*static*/ void ncr53c9x_timeout __P((void *arg)); 109 /*static*/ void ncr53c9x_abort __P((struct ncr53c9x_softc *, 110 struct ncr53c9x_ecb *)); 111 /*static*/ void ncr53c9x_dequeue __P((struct ncr53c9x_softc *, 112 struct ncr53c9x_ecb *)); 113 114 void ncr53c9x_sense __P((struct ncr53c9x_softc *, 115 struct ncr53c9x_ecb *)); 116 void ncr53c9x_free_ecb __P((struct ncr53c9x_softc *, 117 struct ncr53c9x_ecb *, int)); 118 struct ncr53c9x_ecb *ncr53c9x_get_ecb __P((struct ncr53c9x_softc *, int)); 119 120 static inline int ncr53c9x_stp2cpb __P((struct ncr53c9x_softc *, int)); 121 static inline void ncr53c9x_setsync __P((struct ncr53c9x_softc *, 122 struct ncr53c9x_tinfo *)); 123 124 /* 125 * Names for the NCR53c9x variants, correspnding to the variant tags 126 * in ncr53c9xvar.h. 127 */ 128 const char *ncr53c9x_variant_names[] = { 129 "ESP100", 130 "ESP100A", 131 "ESP200", 132 "NCR53C94", 133 "NCR53C96", 134 "ESP406", 135 "FAS408", 136 }; 137 138 /* 139 * Attach this instance, and then all the sub-devices 140 */ 141 void 142 ncr53c9x_attach(sc, adapter, dev) 143 struct ncr53c9x_softc *sc; 144 struct scsi_adapter *adapter; 145 struct scsi_device *dev; 146 { 147 148 /* 149 * Note, the front-end has set us up to print the chip variation. 150 */ 151 152 if (sc->sc_rev >= NCR_VARIANT_MAX) { 153 printf("\n%s: unknown variant %d, devices not attached\n", 154 sc->sc_dev.dv_xname, sc->sc_rev); 155 return; 156 } 157 158 printf(": %s, %dMHz, SCSI ID %d\n", 159 ncr53c9x_variant_names[sc->sc_rev], sc->sc_freq, sc->sc_id); 160 161 sc->sc_ccf = FREQTOCCF(sc->sc_freq); 162 163 /* The value *must not* be == 1. Make it 2 */ 164 if (sc->sc_ccf == 1) 165 sc->sc_ccf = 2; 166 167 /* 168 * The recommended timeout is 250ms. This register is loaded 169 * with a value calculated as follows, from the docs: 170 * 171 * (timout period) x (CLK frequency) 172 * reg = ------------------------------------- 173 * 8192 x (Clock Conversion Factor) 174 * 175 * Since CCF has a linear relation to CLK, this generally computes 176 * to the constant of 153. 177 */ 178 sc->sc_timeout = ((250 * 1000) * sc->sc_freq) / (8192 * sc->sc_ccf); 179 180 /* CCF register only has 3 bits; 0 is actually 8 */ 181 sc->sc_ccf &= 7; 182 183 /* Reset state & bus */ 184 sc->sc_state = 0; 185 ncr53c9x_init(sc, 1); 186 187 /* 188 * fill in the prototype scsi_link. 189 */ 190 sc->sc_link.channel = SCSI_CHANNEL_ONLY_ONE; 191 sc->sc_link.adapter_softc = sc; 192 sc->sc_link.adapter_target = sc->sc_id; 193 sc->sc_link.adapter = adapter; 194 sc->sc_link.device = dev; 195 sc->sc_link.openings = 2; 196 sc->sc_link.max_target = 7; 197 198 /* 199 * Now try to attach all the sub-devices 200 */ 201 config_found(&sc->sc_dev, &sc->sc_link, scsiprint); 202 203 /* 204 * Enable interupts from the SCSI core 205 */ 206 if ((sc->sc_rev == NCR_VARIANT_ESP406) || 207 (sc->sc_rev == NCR_VARIANT_FAS408)) { 208 NCR_PIOREGS(sc); 209 NCR_WRITE_REG(sc, NCR_CFG5, NCRCFG5_SINT | 210 NCR_READ_REG(sc, NCR_CFG5)); 211 NCR_SCSIREGS(sc); 212 } 213 } 214 215 /* 216 * This is the generic esp reset function. It does not reset the SCSI bus, 217 * only this controllers, but kills any on-going commands, and also stops 218 * and resets the DMA. 219 * 220 * After reset, registers are loaded with the defaults from the attach 221 * routine above. 222 */ 223 void 224 ncr53c9x_reset(sc) 225 struct ncr53c9x_softc *sc; 226 { 227 228 /* reset DMA first */ 229 NCRDMA_RESET(sc); 230 231 /* reset SCSI chip */ 232 NCRCMD(sc, NCRCMD_RSTCHIP); 233 NCRCMD(sc, NCRCMD_NOP); 234 DELAY(500); 235 236 /* do these backwards, and fall through */ 237 switch (sc->sc_rev) { 238 case NCR_VARIANT_ESP406: 239 case NCR_VARIANT_FAS408: 240 NCR_SCSIREGS(sc); 241 case NCR_VARIANT_NCR53C94: 242 case NCR_VARIANT_NCR53C96: 243 case NCR_VARIANT_ESP200: 244 NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); 245 case NCR_VARIANT_ESP100A: 246 NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2); 247 case NCR_VARIANT_ESP100: 248 NCR_WRITE_REG(sc, NCR_CFG1, sc->sc_cfg1); 249 NCR_WRITE_REG(sc, NCR_CCF, sc->sc_ccf); 250 NCR_WRITE_REG(sc, NCR_SYNCOFF, 0); 251 NCR_WRITE_REG(sc, NCR_TIMEOUT, sc->sc_timeout); 252 break; 253 default: 254 printf("%s: unknown revision code, assuming ESP100\n", 255 sc->sc_dev.dv_xname); 256 NCR_WRITE_REG(sc, NCR_CFG1, sc->sc_cfg1); 257 NCR_WRITE_REG(sc, NCR_CCF, sc->sc_ccf); 258 NCR_WRITE_REG(sc, NCR_SYNCOFF, 0); 259 NCR_WRITE_REG(sc, NCR_TIMEOUT, sc->sc_timeout); 260 } 261 } 262 263 /* 264 * Reset the SCSI bus, but not the chip 265 */ 266 void 267 ncr53c9x_scsi_reset(sc) 268 struct ncr53c9x_softc *sc; 269 { 270 271 (*sc->sc_glue->gl_dma_stop)(sc); 272 273 printf("%s: resetting SCSI bus\n", sc->sc_dev.dv_xname); 274 NCRCMD(sc, NCRCMD_RSTSCSI); 275 } 276 277 /* 278 * Initialize esp state machine 279 */ 280 void 281 ncr53c9x_init(sc, doreset) 282 struct ncr53c9x_softc *sc; 283 int doreset; 284 { 285 struct ncr53c9x_ecb *ecb; 286 int r; 287 288 NCR_TRACE(("[NCR_INIT(%d)] ", doreset)); 289 290 if (sc->sc_state == 0) { 291 /* First time through; initialize. */ 292 TAILQ_INIT(&sc->ready_list); 293 TAILQ_INIT(&sc->nexus_list); 294 TAILQ_INIT(&sc->free_list); 295 sc->sc_nexus = NULL; 296 ecb = sc->sc_ecb; 297 bzero(ecb, sizeof(sc->sc_ecb)); 298 for (r = 0; r < sizeof(sc->sc_ecb) / sizeof(*ecb); r++) { 299 TAILQ_INSERT_TAIL(&sc->free_list, ecb, chain); 300 ecb++; 301 } 302 bzero(sc->sc_tinfo, sizeof(sc->sc_tinfo)); 303 } else { 304 /* Cancel any active commands. */ 305 sc->sc_state = NCR_CLEANING; 306 if ((ecb = sc->sc_nexus) != NULL) { 307 ecb->xs->error = XS_DRIVER_STUFFUP; 308 ncr53c9x_done(sc, ecb); 309 } 310 while ((ecb = sc->nexus_list.tqh_first) != NULL) { 311 ecb->xs->error = XS_DRIVER_STUFFUP; 312 ncr53c9x_done(sc, ecb); 313 } 314 } 315 316 /* 317 * reset the chip to a known state 318 */ 319 ncr53c9x_reset(sc); 320 321 sc->sc_phase = sc->sc_prevphase = INVALID_PHASE; 322 for (r = 0; r < 8; r++) { 323 struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[r]; 324 /* XXX - config flags per target: low bits: no reselect; high bits: no synch */ 325 int fl = sc->sc_dev.dv_cfdata->cf_flags; 326 327 ti->flags = ((sc->sc_minsync && !(fl & (1<<(r+8)))) 328 ? T_NEGOTIATE : 0) | 329 ((fl & (1<<r)) ? T_RSELECTOFF : 0) | 330 T_NEED_TO_RESET; 331 ti->period = sc->sc_minsync; 332 ti->offset = 0; 333 } 334 335 if (doreset) { 336 sc->sc_state = NCR_SBR; 337 NCRCMD(sc, NCRCMD_RSTSCSI); 338 } else { 339 sc->sc_state = NCR_IDLE; 340 } 341 } 342 343 /* 344 * Read the NCR registers, and save their contents for later use. 345 * NCR_STAT, NCR_STEP & NCR_INTR are mostly zeroed out when reading 346 * NCR_INTR - so make sure it is the last read. 347 * 348 * I think that (from reading the docs) most bits in these registers 349 * only make sense when he DMA CSR has an interrupt showing. Call only 350 * if an interrupt is pending. 351 */ 352 void 353 ncr53c9x_readregs(sc) 354 struct ncr53c9x_softc *sc; 355 { 356 357 sc->sc_espstat = NCR_READ_REG(sc, NCR_STAT); 358 /* Only the stepo bits are of interest */ 359 sc->sc_espstep = NCR_READ_REG(sc, NCR_STEP) & NCRSTEP_MASK; 360 sc->sc_espintr = NCR_READ_REG(sc, NCR_INTR); 361 362 if (sc->sc_glue->gl_clear_latched_intr != NULL) 363 (*sc->sc_glue->gl_clear_latched_intr)(sc); 364 365 /* 366 * Determine the SCSI bus phase, return either a real SCSI bus phase 367 * or some pseudo phase we use to detect certain exceptions. 368 */ 369 370 sc->sc_phase = (sc->sc_espintr & NCRINTR_DIS) 371 ? /* Disconnected */ BUSFREE_PHASE 372 : sc->sc_espstat & NCRSTAT_PHASE; 373 374 NCR_MISC(("regs[intr=%02x,stat=%02x,step=%02x] ", 375 sc->sc_espintr, sc->sc_espstat, sc->sc_espstep)); 376 } 377 378 /* 379 * Convert Synchronous Transfer Period to chip register Clock Per Byte value. 380 */ 381 static inline int 382 ncr53c9x_stp2cpb(sc, period) 383 struct ncr53c9x_softc *sc; 384 int period; 385 { 386 int v; 387 v = (sc->sc_freq * period) / 250; 388 if (ncr53c9x_cpb2stp(sc, v) < period) 389 /* Correct round-down error */ 390 v++; 391 return v; 392 } 393 394 static inline void 395 ncr53c9x_setsync(sc, ti) 396 struct ncr53c9x_softc *sc; 397 struct ncr53c9x_tinfo *ti; 398 { 399 400 if (ti->flags & T_SYNCMODE) { 401 NCR_WRITE_REG(sc, NCR_SYNCOFF, ti->offset); 402 NCR_WRITE_REG(sc, NCR_SYNCTP, 403 ncr53c9x_stp2cpb(sc, ti->period)); 404 } else { 405 NCR_WRITE_REG(sc, NCR_SYNCOFF, 0); 406 NCR_WRITE_REG(sc, NCR_SYNCTP, 0); 407 } 408 } 409 410 int ncr53c9x_dmaselect = 0; 411 /* 412 * Send a command to a target, set the driver state to NCR_SELECTING 413 * and let the caller take care of the rest. 414 * 415 * Keeping this as a function allows me to say that this may be done 416 * by DMA instead of programmed I/O soon. 417 */ 418 void 419 ncr53c9x_select(sc, ecb) 420 struct ncr53c9x_softc *sc; 421 struct ncr53c9x_ecb *ecb; 422 { 423 struct scsi_link *sc_link = ecb->xs->sc_link; 424 int target = sc_link->target; 425 struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[target]; 426 u_char *cmd; 427 int clen; 428 429 NCR_TRACE(("[ncr53c9x_select(t%d,l%d,cmd:%x)] ", 430 sc_link->target, sc_link->lun, ecb->cmd.cmd.opcode)); 431 432 /* new state NCR_SELECTING */ 433 sc->sc_state = NCR_SELECTING; 434 435 /* 436 * Schedule the timeout now, the first time we will go away 437 * expecting to come back due to an interrupt, because it is 438 * always possible that the interrupt may never happen. 439 */ 440 if ((ecb->xs->flags & SCSI_POLL) == 0) 441 timeout(ncr53c9x_timeout, ecb, 442 (ecb->timeout * hz) / 1000); 443 444 NCRCMD(sc, NCRCMD_FLUSH); 445 446 /* 447 * The docs say the target register is never reset, and I 448 * can't think of a better place to set it 449 */ 450 NCR_WRITE_REG(sc, NCR_SELID, target); 451 ncr53c9x_setsync(sc, ti); 452 453 if (ncr53c9x_dmaselect && (ti->flags & T_NEGOTIATE) == 0) { 454 size_t dmacl; 455 ecb->cmd.id = 456 MSG_IDENTIFY(sc_link->lun, (ti->flags & T_RSELECTOFF)?0:1); 457 458 /* setup DMA transfer for command */ 459 clen = ecb->clen + 1; 460 sc->sc_cmdlen = clen; 461 sc->sc_cmdp = (caddr_t)&ecb->cmd; 462 dmacl = clen; 463 NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 0, &dmacl); 464 /* Program the SCSI counter */ 465 NCR_WRITE_REG(sc, NCR_TCL, clen); 466 NCR_WRITE_REG(sc, NCR_TCM, clen >> 8); 467 if (sc->sc_cfg2 & NCRCFG2_FE) { 468 NCR_WRITE_REG(sc, NCR_TCH, clen >> 16); 469 } 470 471 /* And get the targets attention */ 472 NCRCMD(sc, NCRCMD_SELATN | NCRCMD_DMA); 473 NCRDMA_GO(sc); 474 return; 475 } 476 /* 477 * Who am I. This is where we tell the target that we are 478 * happy for it to disconnect etc. 479 */ 480 NCR_WRITE_REG(sc, NCR_FIFO, 481 MSG_IDENTIFY(sc_link->lun, (ti->flags & T_RSELECTOFF)?0:1)); 482 483 if (ti->flags & T_NEGOTIATE) { 484 /* Arbitrate, select and stop after IDENTIFY message */ 485 NCRCMD(sc, NCRCMD_SELATNS); 486 return; 487 } 488 489 /* Now the command into the FIFO */ 490 cmd = (u_char *)&ecb->cmd.cmd; 491 clen = ecb->clen; 492 while (clen--) 493 NCR_WRITE_REG(sc, NCR_FIFO, *cmd++); 494 495 /* And get the targets attention */ 496 NCRCMD(sc, NCRCMD_SELATN); 497 } 498 499 void 500 ncr53c9x_free_ecb(sc, ecb, flags) 501 struct ncr53c9x_softc *sc; 502 struct ncr53c9x_ecb *ecb; 503 int flags; 504 { 505 int s; 506 507 s = splbio(); 508 509 ecb->flags = 0; 510 TAILQ_INSERT_HEAD(&sc->free_list, ecb, chain); 511 512 /* 513 * If there were none, wake anybody waiting for one to come free, 514 * starting with queued entries. 515 */ 516 if (ecb->chain.tqe_next == 0) 517 wakeup(&sc->free_list); 518 519 splx(s); 520 } 521 522 struct ncr53c9x_ecb * 523 ncr53c9x_get_ecb(sc, flags) 524 struct ncr53c9x_softc *sc; 525 int flags; 526 { 527 struct ncr53c9x_ecb *ecb; 528 int s; 529 530 s = splbio(); 531 532 while ((ecb = sc->free_list.tqh_first) == NULL && 533 (flags & SCSI_NOSLEEP) == 0) 534 tsleep(&sc->free_list, PRIBIO, "especb", 0); 535 if (ecb) { 536 TAILQ_REMOVE(&sc->free_list, ecb, chain); 537 ecb->flags |= ECB_ALLOC; 538 } 539 540 splx(s); 541 return ecb; 542 } 543 544 /* 545 * DRIVER FUNCTIONS CALLABLE FROM HIGHER LEVEL DRIVERS 546 */ 547 548 /* 549 * Start a SCSI-command 550 * This function is called by the higher level SCSI-driver to queue/run 551 * SCSI-commands. 552 */ 553 int 554 ncr53c9x_scsi_cmd(xs) 555 struct scsi_xfer *xs; 556 { 557 struct scsi_link *sc_link = xs->sc_link; 558 struct ncr53c9x_softc *sc = sc_link->adapter_softc; 559 struct ncr53c9x_ecb *ecb; 560 int s, flags; 561 562 NCR_TRACE(("[ncr53c9x_scsi_cmd] ")); 563 NCR_CMDS(("[0x%x, %d]->%d ", (int)xs->cmd->opcode, xs->cmdlen, 564 sc_link->target)); 565 566 flags = xs->flags; 567 if ((ecb = ncr53c9x_get_ecb(sc, flags)) == NULL) { 568 xs->error = XS_DRIVER_STUFFUP; 569 return TRY_AGAIN_LATER; 570 } 571 572 /* Initialize ecb */ 573 ecb->xs = xs; 574 ecb->timeout = xs->timeout; 575 576 if (flags & SCSI_RESET) { 577 ecb->flags |= ECB_RESET; 578 ecb->clen = 0; 579 ecb->dleft = 0; 580 } else { 581 bcopy(xs->cmd, &ecb->cmd.cmd, xs->cmdlen); 582 ecb->clen = xs->cmdlen; 583 ecb->daddr = xs->data; 584 ecb->dleft = xs->datalen; 585 } 586 ecb->stat = 0; 587 588 s = splbio(); 589 590 TAILQ_INSERT_TAIL(&sc->ready_list, ecb, chain); 591 if (sc->sc_state == NCR_IDLE) 592 ncr53c9x_sched(sc); 593 594 splx(s); 595 596 if ((flags & SCSI_POLL) == 0) 597 return SUCCESSFULLY_QUEUED; 598 599 /* Not allowed to use interrupts, use polling instead */ 600 if (ncr53c9x_poll(sc, xs, ecb->timeout)) { 601 ncr53c9x_timeout(ecb); 602 if (ncr53c9x_poll(sc, xs, ecb->timeout)) 603 ncr53c9x_timeout(ecb); 604 } 605 return COMPLETE; 606 } 607 608 /* 609 * Used when interrupt driven I/O isn't allowed, e.g. during boot. 610 */ 611 int 612 ncr53c9x_poll(sc, xs, count) 613 struct ncr53c9x_softc *sc; 614 struct scsi_xfer *xs; 615 int count; 616 { 617 618 NCR_TRACE(("[ncr53c9x_poll] ")); 619 while (count) { 620 if (NCRDMA_ISINTR(sc)) { 621 ncr53c9x_intr(sc); 622 } 623 #if alternatively 624 if (NCR_READ_REG(sc, NCR_STAT) & NCRSTAT_INT) 625 ncr53c9x_intr(sc); 626 #endif 627 if ((xs->flags & ITSDONE) != 0) 628 return 0; 629 if (sc->sc_state == NCR_IDLE) { 630 NCR_TRACE(("[ncr53c9x_poll: rescheduling] ")); 631 ncr53c9x_sched(sc); 632 } 633 DELAY(1000); 634 count--; 635 } 636 return 1; 637 } 638 639 640 /* 641 * LOW LEVEL SCSI UTILITIES 642 */ 643 644 /* 645 * Schedule a scsi operation. This has now been pulled out of the interrupt 646 * handler so that we may call it from ncr53c9x_scsi_cmd and ncr53c9x_done. 647 * This may save us an unecessary interrupt just to get things going. 648 * Should only be called when state == NCR_IDLE and at bio pl. 649 */ 650 void 651 ncr53c9x_sched(sc) 652 struct ncr53c9x_softc *sc; 653 { 654 struct ncr53c9x_ecb *ecb; 655 struct scsi_link *sc_link; 656 struct ncr53c9x_tinfo *ti; 657 658 NCR_TRACE(("[ncr53c9x_sched] ")); 659 if (sc->sc_state != NCR_IDLE) 660 panic("ncr53c9x_sched: not IDLE (state=%d)", sc->sc_state); 661 662 /* 663 * Find first ecb in ready queue that is for a target/lunit 664 * combinations that is not busy. 665 */ 666 for (ecb = sc->ready_list.tqh_first; ecb; ecb = ecb->chain.tqe_next) { 667 sc_link = ecb->xs->sc_link; 668 ti = &sc->sc_tinfo[sc_link->target]; 669 if ((ti->lubusy & (1 << sc_link->lun)) == 0) { 670 TAILQ_REMOVE(&sc->ready_list, ecb, chain); 671 sc->sc_nexus = ecb; 672 ncr53c9x_select(sc, ecb); 673 break; 674 } else 675 NCR_MISC(("%d:%d busy\n", 676 sc_link->target, sc_link->lun)); 677 } 678 } 679 680 void 681 ncr53c9x_sense(sc, ecb) 682 struct ncr53c9x_softc *sc; 683 struct ncr53c9x_ecb *ecb; 684 { 685 struct scsi_xfer *xs = ecb->xs; 686 struct scsi_link *sc_link = xs->sc_link; 687 struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target]; 688 struct scsi_sense *ss = (void *)&ecb->cmd.cmd; 689 690 NCR_MISC(("requesting sense ")); 691 /* Next, setup a request sense command block */ 692 bzero(ss, sizeof(*ss)); 693 ss->opcode = REQUEST_SENSE; 694 ss->byte2 = sc_link->lun << 5; 695 ss->length = sizeof(struct scsi_sense_data); 696 ecb->clen = sizeof(*ss); 697 ecb->daddr = (char *)&xs->sense; 698 ecb->dleft = sizeof(struct scsi_sense_data); 699 ecb->flags |= ECB_SENSE; 700 ecb->timeout = NCR_SENSE_TIMEOUT; 701 ti->senses++; 702 if (ecb->flags & ECB_NEXUS) 703 ti->lubusy &= ~(1 << sc_link->lun); 704 if (ecb == sc->sc_nexus) { 705 ncr53c9x_select(sc, ecb); 706 } else { 707 ncr53c9x_dequeue(sc, ecb); 708 TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain); 709 if (sc->sc_state == NCR_IDLE) 710 ncr53c9x_sched(sc); 711 } 712 } 713 714 /* 715 * POST PROCESSING OF SCSI_CMD (usually current) 716 */ 717 void 718 ncr53c9x_done(sc, ecb) 719 struct ncr53c9x_softc *sc; 720 struct ncr53c9x_ecb *ecb; 721 { 722 struct scsi_xfer *xs = ecb->xs; 723 struct scsi_link *sc_link = xs->sc_link; 724 struct ncr53c9x_tinfo *ti = &sc->sc_tinfo[sc_link->target]; 725 726 NCR_TRACE(("[ncr53c9x_done(error:%x)] ", xs->error)); 727 728 untimeout(ncr53c9x_timeout, ecb); 729 730 /* 731 * Now, if we've come here with no error code, i.e. we've kept the 732 * initial XS_NOERROR, and the status code signals that we should 733 * check sense, we'll need to set up a request sense cmd block and 734 * push the command back into the ready queue *before* any other 735 * commands for this target/lunit, else we lose the sense info. 736 * We don't support chk sense conditions for the request sense cmd. 737 */ 738 if (xs->error == XS_NOERROR) { 739 xs->status = ecb->stat; 740 if ((ecb->flags & ECB_ABORT) != 0) { 741 xs->error = XS_DRIVER_STUFFUP; 742 } else if ((ecb->flags & ECB_SENSE) != 0) { 743 xs->error = XS_SENSE; 744 } else if ((ecb->stat & ST_MASK) == SCSI_CHECK) { 745 /* First, save the return values */ 746 xs->resid = ecb->dleft; 747 ncr53c9x_sense(sc, ecb); 748 return; 749 } else { 750 xs->resid = ecb->dleft; 751 } 752 } 753 754 xs->flags |= ITSDONE; 755 756 #ifdef NCR53C9X_DEBUG 757 if (ncr53c9x_debug & NCR_SHOWMISC) { 758 if (xs->resid != 0) 759 printf("resid=%d ", xs->resid); 760 if (xs->error == XS_SENSE) 761 printf("sense=0x%02x\n", xs->sense.error_code); 762 else 763 printf("error=%d\n", xs->error); 764 } 765 #endif 766 767 /* 768 * Remove the ECB from whatever queue it's on. 769 */ 770 if (ecb->flags & ECB_NEXUS) 771 ti->lubusy &= ~(1 << sc_link->lun); 772 if (ecb == sc->sc_nexus) { 773 sc->sc_nexus = NULL; 774 sc->sc_state = NCR_IDLE; 775 ncr53c9x_sched(sc); 776 } else 777 ncr53c9x_dequeue(sc, ecb); 778 779 ncr53c9x_free_ecb(sc, ecb, xs->flags); 780 ti->cmds++; 781 scsi_done(xs); 782 } 783 784 void 785 ncr53c9x_dequeue(sc, ecb) 786 struct ncr53c9x_softc *sc; 787 struct ncr53c9x_ecb *ecb; 788 { 789 790 if (ecb->flags & ECB_NEXUS) { 791 TAILQ_REMOVE(&sc->nexus_list, ecb, chain); 792 } else { 793 TAILQ_REMOVE(&sc->ready_list, ecb, chain); 794 } 795 } 796 797 /* 798 * INTERRUPT/PROTOCOL ENGINE 799 */ 800 801 /* 802 * Schedule an outgoing message by prioritizing it, and asserting 803 * attention on the bus. We can only do this when we are the initiator 804 * else there will be an illegal command interrupt. 805 */ 806 #define ncr53c9x_sched_msgout(m) \ 807 do { \ 808 NCR_MISC(("ncr53c9x_sched_msgout %d ", m)); \ 809 NCRCMD(sc, NCRCMD_SETATN); \ 810 sc->sc_flags |= NCR_ATN; \ 811 sc->sc_msgpriq |= (m); \ 812 } while (0) 813 814 int 815 ncr53c9x_reselect(sc, message) 816 struct ncr53c9x_softc *sc; 817 int message; 818 { 819 u_char selid, target, lun; 820 struct ncr53c9x_ecb *ecb; 821 struct scsi_link *sc_link; 822 struct ncr53c9x_tinfo *ti; 823 824 /* 825 * The SCSI chip made a snapshot of the data bus while the reselection 826 * was being negotiated. This enables us to determine which target did 827 * the reselect. 828 */ 829 selid = sc->sc_selid & ~(1 << sc->sc_id); 830 if (selid & (selid - 1)) { 831 printf("%s: reselect with invalid selid %02x;" 832 " sending DEVICE RESET\n", sc->sc_dev.dv_xname, selid); 833 goto reset; 834 } 835 836 /* 837 * Search wait queue for disconnected cmd 838 * The list should be short, so I haven't bothered with 839 * any more sophisticated structures than a simple 840 * singly linked list. 841 */ 842 target = ffs(selid) - 1; 843 lun = message & 0x07; 844 for (ecb = sc->nexus_list.tqh_first; ecb != NULL; 845 ecb = ecb->chain.tqe_next) { 846 sc_link = ecb->xs->sc_link; 847 if (sc_link->target == target && sc_link->lun == lun) 848 break; 849 } 850 if (ecb == NULL) { 851 printf("%s: reselect from target %d lun %d with no nexus;" 852 " sending ABORT\n", sc->sc_dev.dv_xname, target, lun); 853 goto abort; 854 } 855 856 /* Make this nexus active again. */ 857 TAILQ_REMOVE(&sc->nexus_list, ecb, chain); 858 sc->sc_state = NCR_CONNECTED; 859 sc->sc_nexus = ecb; 860 ti = &sc->sc_tinfo[target]; 861 ti->lubusy |= (1 << lun); 862 ncr53c9x_setsync(sc, ti); 863 864 if (ecb->flags & ECB_RESET) 865 ncr53c9x_sched_msgout(SEND_DEV_RESET); 866 else if (ecb->flags & ECB_ABORT) 867 ncr53c9x_sched_msgout(SEND_ABORT); 868 869 /* Do an implicit RESTORE POINTERS. */ 870 sc->sc_dp = ecb->daddr; 871 sc->sc_dleft = ecb->dleft; 872 873 return (0); 874 875 reset: 876 ncr53c9x_sched_msgout(SEND_DEV_RESET); 877 return (1); 878 879 abort: 880 ncr53c9x_sched_msgout(SEND_ABORT); 881 return (1); 882 } 883 884 #define IS1BYTEMSG(m) (((m) != 1 && (m) < 0x20) || (m) & 0x80) 885 #define IS2BYTEMSG(m) (((m) & 0xf0) == 0x20) 886 #define ISEXTMSG(m) ((m) == 1) 887 888 /* 889 * Get an incoming message as initiator. 890 * 891 * The SCSI bus must already be in MESSAGE_IN_PHASE and there is a 892 * byte in the FIFO 893 */ 894 void 895 ncr53c9x_msgin(sc) 896 register struct ncr53c9x_softc *sc; 897 { 898 register int v; 899 900 NCR_TRACE(("[ncr53c9x_msgin(curmsglen:%ld)] ", (long)sc->sc_imlen)); 901 902 if ((NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) == 0) { 903 printf("%s: msgin: no msg byte available\n", 904 sc->sc_dev.dv_xname); 905 return; 906 } 907 908 /* 909 * Prepare for a new message. A message should (according 910 * to the SCSI standard) be transmitted in one single 911 * MESSAGE_IN_PHASE. If we have been in some other phase, 912 * then this is a new message. 913 */ 914 if (sc->sc_prevphase != MESSAGE_IN_PHASE) { 915 sc->sc_flags &= ~NCR_DROP_MSGI; 916 sc->sc_imlen = 0; 917 } 918 919 v = NCR_READ_REG(sc, NCR_FIFO); 920 NCR_MISC(("<msgbyte:0x%02x>", v)); 921 922 #if 0 923 if (sc->sc_state == NCR_RESELECTED && sc->sc_imlen == 0) { 924 /* 925 * Which target is reselecting us? (The ID bit really) 926 */ 927 sc->sc_selid = v; 928 NCR_MISC(("selid=0x%2x ", sc->sc_selid)); 929 return; 930 } 931 #endif 932 933 sc->sc_imess[sc->sc_imlen] = v; 934 935 /* 936 * If we're going to reject the message, don't bother storing 937 * the incoming bytes. But still, we need to ACK them. 938 */ 939 940 if ((sc->sc_flags & NCR_DROP_MSGI)) { 941 NCRCMD(sc, NCRCMD_MSGOK); 942 printf("<dropping msg byte %x>", 943 sc->sc_imess[sc->sc_imlen]); 944 return; 945 } 946 947 if (sc->sc_imlen >= NCR_MAX_MSG_LEN) { 948 ncr53c9x_sched_msgout(SEND_REJECT); 949 sc->sc_flags |= NCR_DROP_MSGI; 950 } else { 951 sc->sc_imlen++; 952 /* 953 * This testing is suboptimal, but most 954 * messages will be of the one byte variety, so 955 * it should not effect performance 956 * significantly. 957 */ 958 if (sc->sc_imlen == 1 && IS1BYTEMSG(sc->sc_imess[0])) 959 goto gotit; 960 if (sc->sc_imlen == 2 && IS2BYTEMSG(sc->sc_imess[0])) 961 goto gotit; 962 if (sc->sc_imlen >= 3 && ISEXTMSG(sc->sc_imess[0]) && 963 sc->sc_imlen == sc->sc_imess[1] + 2) 964 goto gotit; 965 } 966 /* Ack what we have so far */ 967 NCRCMD(sc, NCRCMD_MSGOK); 968 return; 969 970 gotit: 971 NCR_MSGS(("gotmsg(%x)", sc->sc_imess[0])); 972 /* 973 * Now we should have a complete message (1 byte, 2 byte 974 * and moderately long extended messages). We only handle 975 * extended messages which total length is shorter than 976 * NCR_MAX_MSG_LEN. Longer messages will be amputated. 977 */ 978 switch (sc->sc_state) { 979 struct ncr53c9x_ecb *ecb; 980 struct ncr53c9x_tinfo *ti; 981 982 case NCR_CONNECTED: 983 ecb = sc->sc_nexus; 984 ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; 985 986 switch (sc->sc_imess[0]) { 987 case MSG_CMDCOMPLETE: 988 NCR_MSGS(("cmdcomplete ")); 989 if (sc->sc_dleft < 0) { 990 struct scsi_link *sc_link = ecb->xs->sc_link; 991 printf("%s: %ld extra bytes from %d:%d\n", 992 sc->sc_dev.dv_xname, -(long)sc->sc_dleft, 993 sc_link->target, sc_link->lun); 994 sc->sc_dleft = 0; 995 } 996 ecb->dleft = (ecb->flags & ECB_TENTATIVE_DONE) 997 ? 0 998 : sc->sc_dleft; 999 if ((ecb->flags & ECB_SENSE) == 0) 1000 ecb->xs->resid = ecb->dleft; 1001 sc->sc_state = NCR_CMDCOMPLETE; 1002 break; 1003 1004 case MSG_MESSAGE_REJECT: 1005 if (ncr53c9x_debug & NCR_SHOWMSGS) 1006 printf("%s: our msg rejected by target\n", 1007 sc->sc_dev.dv_xname); 1008 switch (sc->sc_msgout) { 1009 case SEND_SDTR: 1010 sc->sc_flags &= ~NCR_SYNCHNEGO; 1011 ti->flags &= ~(T_NEGOTIATE | T_SYNCMODE); 1012 ncr53c9x_setsync(sc, ti); 1013 break; 1014 case SEND_INIT_DET_ERR: 1015 goto abort; 1016 } 1017 break; 1018 1019 case MSG_NOOP: 1020 NCR_MSGS(("noop ")); 1021 break; 1022 1023 case MSG_DISCONNECT: 1024 NCR_MSGS(("disconnect ")); 1025 ti->dconns++; 1026 sc->sc_state = NCR_DISCONNECT; 1027 1028 /* 1029 * Mark the fact that all bytes have moved. The 1030 * target may not bother to do a SAVE POINTERS 1031 * at this stage. This flag will set the residual 1032 * count to zero on MSG COMPLETE. 1033 */ 1034 if (sc->sc_dleft == 0) 1035 ecb->flags |= ECB_TENTATIVE_DONE; 1036 1037 break; 1038 1039 case MSG_SAVEDATAPOINTER: 1040 NCR_MSGS(("save datapointer ")); 1041 ecb->daddr = sc->sc_dp; 1042 ecb->dleft = sc->sc_dleft; 1043 break; 1044 1045 case MSG_RESTOREPOINTERS: 1046 NCR_MSGS(("restore datapointer ")); 1047 sc->sc_dp = ecb->daddr; 1048 sc->sc_dleft = ecb->dleft; 1049 break; 1050 1051 case MSG_EXTENDED: 1052 NCR_MSGS(("extended(%x) ", sc->sc_imess[2])); 1053 switch (sc->sc_imess[2]) { 1054 case MSG_EXT_SDTR: 1055 NCR_MSGS(("SDTR period %d, offset %d ", 1056 sc->sc_imess[3], sc->sc_imess[4])); 1057 if (sc->sc_imess[1] != 3) 1058 goto reject; 1059 ti->period = sc->sc_imess[3]; 1060 ti->offset = sc->sc_imess[4]; 1061 ti->flags &= ~T_NEGOTIATE; 1062 if (sc->sc_minsync == 0 || 1063 ti->offset == 0 || 1064 ti->period > 124) { 1065 printf("%s:%d: async\n", "esp", 1066 ecb->xs->sc_link->target); 1067 if ((sc->sc_flags&NCR_SYNCHNEGO) 1068 == 0) { 1069 /* 1070 * target initiated negotiation 1071 */ 1072 ti->offset = 0; 1073 ti->flags &= ~T_SYNCMODE; 1074 ncr53c9x_sched_msgout( 1075 SEND_SDTR); 1076 } else { 1077 /* we are async */ 1078 ti->flags &= ~T_SYNCMODE; 1079 } 1080 } else { 1081 int r = 250/ti->period; 1082 int s = (100*250)/ti->period - 100*r; 1083 int p; 1084 1085 p = ncr53c9x_stp2cpb(sc, ti->period); 1086 ti->period = ncr53c9x_cpb2stp(sc, p); 1087 #ifdef NCR53C9X_DEBUG 1088 sc_print_addr(ecb->xs->sc_link); 1089 printf("max sync rate %d.%02dMb/s\n", 1090 r, s); 1091 #endif 1092 if ((sc->sc_flags&NCR_SYNCHNEGO) 1093 == 0) { 1094 /* 1095 * target initiated negotiation 1096 */ 1097 if (ti->period < 1098 sc->sc_minsync) 1099 ti->period = 1100 sc->sc_minsync; 1101 if (ti->offset > 15) 1102 ti->offset = 15; 1103 ti->flags &= ~T_SYNCMODE; 1104 ncr53c9x_sched_msgout( 1105 SEND_SDTR); 1106 } else { 1107 /* we are sync */ 1108 ti->flags |= T_SYNCMODE; 1109 } 1110 } 1111 sc->sc_flags &= ~NCR_SYNCHNEGO; 1112 ncr53c9x_setsync(sc, ti); 1113 break; 1114 1115 default: 1116 printf("%s: unrecognized MESSAGE EXTENDED;" 1117 " sending REJECT\n", sc->sc_dev.dv_xname); 1118 goto reject; 1119 } 1120 break; 1121 1122 default: 1123 NCR_MSGS(("ident ")); 1124 printf("%s: unrecognized MESSAGE; sending REJECT\n", 1125 sc->sc_dev.dv_xname); 1126 reject: 1127 ncr53c9x_sched_msgout(SEND_REJECT); 1128 break; 1129 } 1130 break; 1131 1132 case NCR_RESELECTED: 1133 if (!MSG_ISIDENTIFY(sc->sc_imess[0])) { 1134 printf("%s: reselect without IDENTIFY;" 1135 " sending DEVICE RESET\n", sc->sc_dev.dv_xname); 1136 goto reset; 1137 } 1138 1139 (void) ncr53c9x_reselect(sc, sc->sc_imess[0]); 1140 break; 1141 1142 default: 1143 printf("%s: unexpected MESSAGE IN; sending DEVICE RESET\n", 1144 sc->sc_dev.dv_xname); 1145 reset: 1146 ncr53c9x_sched_msgout(SEND_DEV_RESET); 1147 break; 1148 1149 abort: 1150 ncr53c9x_sched_msgout(SEND_ABORT); 1151 break; 1152 } 1153 1154 /* Ack last message byte */ 1155 NCRCMD(sc, NCRCMD_MSGOK); 1156 1157 /* Done, reset message pointer. */ 1158 sc->sc_flags &= ~NCR_DROP_MSGI; 1159 sc->sc_imlen = 0; 1160 } 1161 1162 1163 /* 1164 * Send the highest priority, scheduled message 1165 */ 1166 void 1167 ncr53c9x_msgout(sc) 1168 register struct ncr53c9x_softc *sc; 1169 { 1170 struct ncr53c9x_tinfo *ti; 1171 struct ncr53c9x_ecb *ecb; 1172 size_t size; 1173 1174 NCR_TRACE(("[ncr53c9x_msgout(priq:%x, prevphase:%x)]", 1175 sc->sc_msgpriq, sc->sc_prevphase)); 1176 1177 if (sc->sc_flags & NCR_ATN) { 1178 if (sc->sc_prevphase != MESSAGE_OUT_PHASE) { 1179 new: 1180 NCRCMD(sc, NCRCMD_FLUSH); 1181 DELAY(1); 1182 sc->sc_msgoutq = 0; 1183 sc->sc_omlen = 0; 1184 } 1185 } else { 1186 if (sc->sc_prevphase == MESSAGE_OUT_PHASE) { 1187 ncr53c9x_sched_msgout(sc->sc_msgoutq); 1188 goto new; 1189 } else { 1190 printf("%s at line %d: unexpected MESSAGE OUT phase\n", 1191 sc->sc_dev.dv_xname, __LINE__); 1192 } 1193 } 1194 1195 if (sc->sc_omlen == 0) { 1196 /* Pick up highest priority message */ 1197 sc->sc_msgout = sc->sc_msgpriq & -sc->sc_msgpriq; 1198 sc->sc_msgoutq |= sc->sc_msgout; 1199 sc->sc_msgpriq &= ~sc->sc_msgout; 1200 sc->sc_omlen = 1; /* "Default" message len */ 1201 switch (sc->sc_msgout) { 1202 case SEND_SDTR: 1203 ecb = sc->sc_nexus; 1204 ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; 1205 sc->sc_omess[0] = MSG_EXTENDED; 1206 sc->sc_omess[1] = 3; 1207 sc->sc_omess[2] = MSG_EXT_SDTR; 1208 sc->sc_omess[3] = ti->period; 1209 sc->sc_omess[4] = ti->offset; 1210 sc->sc_omlen = 5; 1211 if ((sc->sc_flags & NCR_SYNCHNEGO) == 0) { 1212 ti->flags |= T_SYNCMODE; 1213 ncr53c9x_setsync(sc, ti); 1214 } 1215 break; 1216 case SEND_IDENTIFY: 1217 if (sc->sc_state != NCR_CONNECTED) { 1218 printf("%s at line %d: no nexus\n", 1219 sc->sc_dev.dv_xname, __LINE__); 1220 } 1221 ecb = sc->sc_nexus; 1222 sc->sc_omess[0] = 1223 MSG_IDENTIFY(ecb->xs->sc_link->lun, 0); 1224 break; 1225 case SEND_DEV_RESET: 1226 sc->sc_flags |= NCR_ABORTING; 1227 sc->sc_omess[0] = MSG_BUS_DEV_RESET; 1228 ecb = sc->sc_nexus; 1229 ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; 1230 ti->flags &= ~T_SYNCMODE; 1231 ti->flags |= T_NEGOTIATE; 1232 break; 1233 case SEND_PARITY_ERROR: 1234 sc->sc_omess[0] = MSG_PARITY_ERROR; 1235 break; 1236 case SEND_ABORT: 1237 sc->sc_flags |= NCR_ABORTING; 1238 sc->sc_omess[0] = MSG_ABORT; 1239 break; 1240 case SEND_INIT_DET_ERR: 1241 sc->sc_omess[0] = MSG_INITIATOR_DET_ERR; 1242 break; 1243 case SEND_REJECT: 1244 sc->sc_omess[0] = MSG_MESSAGE_REJECT; 1245 break; 1246 default: 1247 NCRCMD(sc, NCRCMD_RSTATN); 1248 sc->sc_flags &= ~NCR_ATN; 1249 sc->sc_omess[0] = MSG_NOOP; 1250 break; 1251 } 1252 sc->sc_omp = sc->sc_omess; 1253 } 1254 1255 #if 1 1256 /* (re)send the message */ 1257 size = min(sc->sc_omlen, sc->sc_maxxfer); 1258 NCRDMA_SETUP(sc, &sc->sc_omp, &sc->sc_omlen, 0, &size); 1259 /* Program the SCSI counter */ 1260 NCR_WRITE_REG(sc, NCR_TCL, size); 1261 NCR_WRITE_REG(sc, NCR_TCM, size >> 8); 1262 if (sc->sc_cfg2 & NCRCFG2_FE) { 1263 NCR_WRITE_REG(sc, NCR_TCH, size >> 16); 1264 } 1265 /* load the count in */ 1266 NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA); 1267 NCRCMD(sc, NCRCMD_TRANS|NCRCMD_DMA); 1268 NCRDMA_GO(sc); 1269 #else 1270 { int i; 1271 for (i = 0; i < sc->sc_omlen; i++) 1272 NCR_WRITE_REG(sc, FIFO, sc->sc_omess[i]); 1273 NCRCMD(sc, NCRCMD_TRANS); 1274 sc->sc_omlen = 0; 1275 } 1276 #endif 1277 } 1278 1279 /* 1280 * This is the most critical part of the driver, and has to know 1281 * how to deal with *all* error conditions and phases from the SCSI 1282 * bus. If there are no errors and the DMA was active, then call the 1283 * DMA pseudo-interrupt handler. If this returns 1, then that was it 1284 * and we can return from here without further processing. 1285 * 1286 * Most of this needs verifying. 1287 */ 1288 int 1289 ncr53c9x_intr(sc) 1290 register struct ncr53c9x_softc *sc; 1291 { 1292 register struct ncr53c9x_ecb *ecb; 1293 register struct scsi_link *sc_link; 1294 struct ncr53c9x_tinfo *ti; 1295 int loop; 1296 size_t size; 1297 int nfifo; 1298 1299 NCR_TRACE(("[ncr53c9x_intr] ")); 1300 1301 /* 1302 * I have made some (maybe seriously flawed) assumptions here, 1303 * but basic testing (uncomment the printf() below), show that 1304 * certainly something happens when this loop is here. 1305 * 1306 * The idea is that many of the SCSI operations take very little 1307 * time, and going away and getting interrupted is too high an 1308 * overhead to pay. For example, selecting, sending a message 1309 * and command and then doing some work can be done in one "pass". 1310 * 1311 * The DELAY is not variable because I do not understand that the 1312 * DELAY loop should be fixed-time regardless of CPU speed, but 1313 * I am *assuming* that the faster SCSI processors get things done 1314 * quicker (sending a command byte etc), and so there is no 1315 * need to be too slow. 1316 * 1317 * This is a heuristic. It is 2 when at 20Mhz, 2 at 25Mhz and 1 1318 * at 40Mhz. This needs testing. 1319 */ 1320 for (loop = 0; 1;loop++, DELAY(50/sc->sc_freq)) { 1321 /* a feeling of deja-vu */ 1322 if (!NCRDMA_ISINTR(sc)) 1323 return (loop != 0); 1324 #if 0 1325 if (loop) 1326 printf("*"); 1327 #endif 1328 1329 /* and what do the registers say... */ 1330 ncr53c9x_readregs(sc); 1331 1332 sc->sc_intrcnt.ev_count++; 1333 1334 /* 1335 * At the moment, only a SCSI Bus Reset or Illegal 1336 * Command are classed as errors. A disconnect is a 1337 * valid condition, and we let the code check is the 1338 * "NCR_BUSFREE_OK" flag was set before declaring it 1339 * and error. 1340 * 1341 * Also, the status register tells us about "Gross 1342 * Errors" and "Parity errors". Only the Gross Error 1343 * is really bad, and the parity errors are dealt 1344 * with later 1345 * 1346 * TODO 1347 * If there are too many parity error, go to slow 1348 * cable mode ? 1349 */ 1350 1351 /* SCSI Reset */ 1352 if (sc->sc_espintr & NCRINTR_SBR) { 1353 if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) { 1354 NCRCMD(sc, NCRCMD_FLUSH); 1355 DELAY(1); 1356 } 1357 if (sc->sc_state != NCR_SBR) { 1358 printf("%s: SCSI bus reset\n", 1359 sc->sc_dev.dv_xname); 1360 ncr53c9x_init(sc, 0); /* Restart everything */ 1361 return 1; 1362 } 1363 #if 0 1364 /*XXX*/ printf("<expected bus reset: " 1365 "[intr %x, stat %x, step %d]>\n", 1366 sc->sc_espintr, sc->sc_espstat, 1367 sc->sc_espstep); 1368 #endif 1369 if (sc->sc_nexus) 1370 panic("%s: nexus in reset state", 1371 sc->sc_dev.dv_xname); 1372 goto sched; 1373 } 1374 1375 ecb = sc->sc_nexus; 1376 1377 #define NCRINTR_ERR (NCRINTR_SBR|NCRINTR_ILL) 1378 if (sc->sc_espintr & NCRINTR_ERR || 1379 sc->sc_espstat & NCRSTAT_GE) { 1380 1381 if (sc->sc_espstat & NCRSTAT_GE) { 1382 /* no target ? */ 1383 if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) { 1384 NCRCMD(sc, NCRCMD_FLUSH); 1385 DELAY(1); 1386 } 1387 if (sc->sc_state == NCR_CONNECTED || 1388 sc->sc_state == NCR_SELECTING) { 1389 ecb->xs->error = XS_DRIVER_STUFFUP; 1390 ncr53c9x_done(sc, ecb); 1391 } 1392 return 1; 1393 } 1394 1395 if (sc->sc_espintr & NCRINTR_ILL) { 1396 if (sc->sc_flags & NCR_EXPECT_ILLCMD) { 1397 printf("%s: ILL: ESP100 work-around activated\n", sc->sc_dev.dv_xname); 1398 sc->sc_flags &= ~NCR_EXPECT_ILLCMD; 1399 continue; 1400 } 1401 /* illegal command, out of sync ? */ 1402 printf("%s: illegal command: 0x%x " 1403 "(state %d, phase %x, prevphase %x)\n", 1404 sc->sc_dev.dv_xname, sc->sc_lastcmd, 1405 sc->sc_state, sc->sc_phase, 1406 sc->sc_prevphase); 1407 if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) { 1408 NCRCMD(sc, NCRCMD_FLUSH); 1409 DELAY(1); 1410 } 1411 ncr53c9x_init(sc, 1); /* Restart everything */ 1412 return 1; 1413 } 1414 } 1415 sc->sc_flags &= ~NCR_EXPECT_ILLCMD; 1416 1417 /* 1418 * Call if DMA is active. 1419 * 1420 * If DMA_INTR returns true, then maybe go 'round the loop 1421 * again in case there is no more DMA queued, but a phase 1422 * change is expected. 1423 */ 1424 if (NCRDMA_ISACTIVE(sc)) { 1425 int r = NCRDMA_INTR(sc); 1426 if (r == -1) { 1427 printf("%s: DMA error; resetting\n", 1428 sc->sc_dev.dv_xname); 1429 ncr53c9x_init(sc, 1); 1430 } 1431 /* If DMA active here, then go back to work... */ 1432 if (NCRDMA_ISACTIVE(sc)) 1433 return 1; 1434 1435 /* 1436 * Note that this can happen during normal operation 1437 * if we are reselected while using DMA to select 1438 * a target. If this is the case, don't issue the 1439 * warning. 1440 */ 1441 if (sc->sc_dleft == 0 && 1442 (sc->sc_espstat & NCRSTAT_TC) == 0 && 1443 !((sc->sc_espintr & NCRINTR_RESEL) && 1444 sc->sc_state == NCR_SELECTING)) 1445 printf("%s: !TC [intr %x, stat %x, step %d]" 1446 " prevphase %x, resid %x\n", 1447 sc->sc_dev.dv_xname, 1448 sc->sc_espintr, 1449 sc->sc_espstat, 1450 sc->sc_espstep, 1451 sc->sc_prevphase, 1452 ecb?ecb->dleft:-1); 1453 } 1454 1455 #if 0 /* Unreliable on some NCR revisions? */ 1456 if ((sc->sc_espstat & NCRSTAT_INT) == 0) { 1457 printf("%s: spurious interrupt\n", 1458 sc->sc_dev.dv_xname); 1459 return 1; 1460 } 1461 #endif 1462 1463 /* 1464 * check for less serious errors 1465 */ 1466 if (sc->sc_espstat & NCRSTAT_PE) { 1467 printf("%s: SCSI bus parity error\n", 1468 sc->sc_dev.dv_xname); 1469 if (sc->sc_prevphase == MESSAGE_IN_PHASE) 1470 ncr53c9x_sched_msgout(SEND_PARITY_ERROR); 1471 else 1472 ncr53c9x_sched_msgout(SEND_INIT_DET_ERR); 1473 } 1474 1475 if (sc->sc_espintr & NCRINTR_DIS) { 1476 NCR_MISC(("<DISC [intr %x, stat %x, step %d]>", 1477 sc->sc_espintr,sc->sc_espstat,sc->sc_espstep)); 1478 if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) { 1479 NCRCMD(sc, NCRCMD_FLUSH); 1480 DELAY(1); 1481 } 1482 /* 1483 * This command must (apparently) be issued within 1484 * 250mS of a disconnect. So here you are... 1485 */ 1486 NCRCMD(sc, NCRCMD_ENSEL); 1487 switch (sc->sc_state) { 1488 case NCR_RESELECTED: 1489 goto sched; 1490 1491 case NCR_SELECTING: 1492 ecb->xs->error = XS_SELTIMEOUT; 1493 goto finish; 1494 1495 case NCR_CONNECTED: 1496 if ((sc->sc_flags & NCR_SYNCHNEGO)) { 1497 #ifdef NCR53C9X_DEBUG 1498 if (ecb) 1499 sc_print_addr(ecb->xs->sc_link); 1500 printf("sync nego not completed!\n"); 1501 #endif 1502 ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; 1503 sc->sc_flags &= ~NCR_SYNCHNEGO; 1504 ti->flags &= 1505 ~(T_NEGOTIATE | T_SYNCMODE); 1506 } 1507 1508 /* it may be OK to disconnect */ 1509 if ((sc->sc_flags & NCR_ABORTING) == 0) { 1510 /* 1511 * Section 5.1.1 of the SCSI 2 spec 1512 * suggests issuing a REQUEST SENSE 1513 * following an unexpected disconnect. 1514 * Some devices go into a contingent 1515 * allegiance condition when 1516 * disconnecting, and this is necessary 1517 * to clean up their state. 1518 */ 1519 printf("%s: unexpected disconnect; ", 1520 sc->sc_dev.dv_xname); 1521 if (ecb->flags & ECB_SENSE) { 1522 printf("resetting\n"); 1523 goto reset; 1524 } 1525 printf("sending REQUEST SENSE\n"); 1526 untimeout(ncr53c9x_timeout, ecb); 1527 ncr53c9x_sense(sc, ecb); 1528 goto out; 1529 } 1530 1531 ecb->xs->error = XS_DRIVER_STUFFUP; 1532 goto finish; 1533 1534 case NCR_DISCONNECT: 1535 TAILQ_INSERT_HEAD(&sc->nexus_list, ecb, chain); 1536 sc->sc_nexus = NULL; 1537 goto sched; 1538 1539 case NCR_CMDCOMPLETE: 1540 goto finish; 1541 } 1542 } 1543 1544 switch (sc->sc_state) { 1545 1546 case NCR_SBR: 1547 printf("%s: waiting for SCSI Bus Reset to happen\n", 1548 sc->sc_dev.dv_xname); 1549 return 1; 1550 1551 case NCR_RESELECTED: 1552 /* 1553 * we must be continuing a message ? 1554 */ 1555 if (sc->sc_phase != MESSAGE_IN_PHASE) { 1556 printf("%s: target didn't identify\n", 1557 sc->sc_dev.dv_xname); 1558 ncr53c9x_init(sc, 1); 1559 return 1; 1560 } 1561 printf("<<RESELECT CONT'd>>"); 1562 #if XXXX 1563 ncr53c9x_msgin(sc); 1564 if (sc->sc_state != NCR_CONNECTED) { 1565 /* IDENTIFY fail?! */ 1566 printf("%s: identify failed\n", 1567 sc->sc_dev.dv_xname); 1568 ncr53c9x_init(sc, 1); 1569 return 1; 1570 } 1571 #endif 1572 break; 1573 1574 case NCR_IDLE: 1575 if (sc->sc_flags & NCR_ICCS) printf("[[esp: BUMMER]]"); 1576 case NCR_SELECTING: 1577 sc->sc_msgpriq = sc->sc_msgout = sc->sc_msgoutq = 0; 1578 sc->sc_flags = 0; 1579 ecb = sc->sc_nexus; 1580 1581 if (sc->sc_espintr & NCRINTR_RESEL) { 1582 /* 1583 * If we're trying to select a 1584 * target ourselves, push our command 1585 * back into the ready list. 1586 */ 1587 if (sc->sc_state == NCR_SELECTING) { 1588 NCR_MISC(("backoff selector ")); 1589 untimeout(ncr53c9x_timeout, ecb); 1590 sc_link = ecb->xs->sc_link; 1591 ti = &sc->sc_tinfo[sc_link->target]; 1592 TAILQ_INSERT_HEAD(&sc->ready_list, 1593 ecb, chain); 1594 ecb = sc->sc_nexus = NULL; 1595 } 1596 sc->sc_state = NCR_RESELECTED; 1597 if (sc->sc_phase != MESSAGE_IN_PHASE) { 1598 /* 1599 * Things are seriously fucked up. 1600 * Pull the brakes, i.e. reset 1601 */ 1602 printf("%s: target didn't identify\n", 1603 sc->sc_dev.dv_xname); 1604 ncr53c9x_init(sc, 1); 1605 return 1; 1606 } 1607 /* 1608 * The C90 only inhibits FIFO writes until 1609 * reselection is complete, instead of 1610 * waiting until the interrupt status register 1611 * has been read. So, if the reselect happens 1612 * while we were entering a command bytes (for 1613 * another target) some of those bytes can 1614 * appear in the FIFO here, after the 1615 * interrupt is taken. 1616 */ 1617 nfifo = NCR_READ_REG(sc,NCR_FFLAG) & NCRFIFO_FF; 1618 if (nfifo < 2 || 1619 (nfifo > 2 && 1620 sc->sc_rev != NCR_VARIANT_ESP100)) { 1621 printf("%s: RESELECT: " 1622 "%d bytes in FIFO! " 1623 "[intr %x, stat %x, step %d, prevphase %x]\n", 1624 sc->sc_dev.dv_xname, 1625 nfifo, 1626 sc->sc_espintr, 1627 sc->sc_espstat, 1628 sc->sc_espstep, 1629 sc->sc_prevphase); 1630 ncr53c9x_init(sc, 1); 1631 return 1; 1632 } 1633 sc->sc_selid = NCR_READ_REG(sc, NCR_FIFO); 1634 NCR_MISC(("selid=0x%2x ", sc->sc_selid)); 1635 1636 /* Handle identify message */ 1637 ncr53c9x_msgin(sc); 1638 if (nfifo != 2) { 1639 sc->sc_flags |= NCR_EXPECT_ILLCMD; 1640 NCRCMD(sc, NCRCMD_FLUSH); 1641 } 1642 1643 if (sc->sc_state != NCR_CONNECTED) { 1644 /* IDENTIFY fail?! */ 1645 printf("%s: identify failed\n", 1646 sc->sc_dev.dv_xname); 1647 ncr53c9x_init(sc, 1); 1648 return 1; 1649 } 1650 continue; /* ie. next phase expected soon */ 1651 } 1652 1653 #define NCRINTR_DONE (NCRINTR_FC|NCRINTR_BS) 1654 if ((sc->sc_espintr & NCRINTR_DONE) == NCRINTR_DONE) { 1655 ecb = sc->sc_nexus; 1656 if (!ecb) 1657 panic("esp: not nexus at sc->sc_nexus"); 1658 1659 sc_link = ecb->xs->sc_link; 1660 ti = &sc->sc_tinfo[sc_link->target]; 1661 1662 switch (sc->sc_espstep) { 1663 case 0: 1664 printf("%s: select timeout/no " 1665 "disconnect\n", 1666 sc->sc_dev.dv_xname); 1667 ecb->xs->error = XS_SELTIMEOUT; 1668 goto finish; 1669 case 1: 1670 if ((ti->flags & T_NEGOTIATE) == 0) { 1671 printf("%s: step 1 & !NEG\n", 1672 sc->sc_dev.dv_xname); 1673 goto reset; 1674 } 1675 if (sc->sc_phase != MESSAGE_OUT_PHASE) { 1676 printf("%s: !MSGOUT\n", 1677 sc->sc_dev.dv_xname); 1678 goto reset; 1679 } 1680 /* Start negotiating */ 1681 ti->period = sc->sc_minsync; 1682 ti->offset = 15; 1683 sc->sc_flags |= NCR_SYNCHNEGO; 1684 ncr53c9x_sched_msgout(SEND_SDTR); 1685 break; 1686 case 3: 1687 /* 1688 * Grr, this is supposed to mean 1689 * "target left command phase 1690 * prematurely". It seems to happen 1691 * regularly when sync mode is on. 1692 * Look at FIFO to see if command 1693 * went out. 1694 * (Timing problems?) 1695 */ 1696 if (ncr53c9x_dmaselect) { 1697 if (sc->sc_cmdlen == 0) 1698 /* Hope for the best.. */ 1699 break; 1700 } else if ((NCR_READ_REG(sc, NCR_FFLAG) 1701 & NCRFIFO_FF) == 0) { 1702 /* Hope for the best.. */ 1703 break; 1704 } 1705 printf("(%s:%d:%d): selection failed;" 1706 " %d left in FIFO " 1707 "[intr %x, stat %x, step %d]\n", 1708 sc->sc_dev.dv_xname, 1709 sc_link->target, 1710 sc_link->lun, 1711 NCR_READ_REG(sc, NCR_FFLAG) 1712 & NCRFIFO_FF, 1713 sc->sc_espintr, sc->sc_espstat, 1714 sc->sc_espstep); 1715 NCRCMD(sc, NCRCMD_FLUSH); 1716 ncr53c9x_sched_msgout(SEND_ABORT); 1717 return 1; 1718 case 2: 1719 /* Select stuck at Command Phase */ 1720 NCRCMD(sc, NCRCMD_FLUSH); 1721 case 4: 1722 if (ncr53c9x_dmaselect && 1723 sc->sc_cmdlen != 0) 1724 printf("(%s:%d:%d): select; " 1725 "%d left in DMA buffer\n", 1726 sc->sc_dev.dv_xname, 1727 sc_link->target, 1728 sc_link->lun, 1729 sc->sc_cmdlen); 1730 /* So far, everything went fine */ 1731 break; 1732 } 1733 #if 0 1734 if (ecb->xs->flags & SCSI_RESET) 1735 ncr53c9x_sched_msgout(SEND_DEV_RESET); 1736 else if (ti->flags & T_NEGOTIATE) 1737 ncr53c9x_sched_msgout( 1738 SEND_IDENTIFY | SEND_SDTR); 1739 else 1740 ncr53c9x_sched_msgout(SEND_IDENTIFY); 1741 #endif 1742 1743 ecb->flags |= ECB_NEXUS; 1744 ti->lubusy |= (1 << sc_link->lun); 1745 1746 sc->sc_prevphase = INVALID_PHASE; /* ?? */ 1747 /* Do an implicit RESTORE POINTERS. */ 1748 sc->sc_dp = ecb->daddr; 1749 sc->sc_dleft = ecb->dleft; 1750 sc->sc_state = NCR_CONNECTED; 1751 break; 1752 } else { 1753 printf("%s: unexpected status after select" 1754 ": [intr %x, stat %x, step %x]\n", 1755 sc->sc_dev.dv_xname, 1756 sc->sc_espintr, sc->sc_espstat, 1757 sc->sc_espstep); 1758 NCRCMD(sc, NCRCMD_FLUSH); 1759 DELAY(1); 1760 goto reset; 1761 } 1762 if (sc->sc_state == NCR_IDLE) { 1763 printf("%s: stray interrupt\n", 1764 sc->sc_dev.dv_xname); 1765 return 0; 1766 } 1767 break; 1768 1769 case NCR_CONNECTED: 1770 if (sc->sc_flags & NCR_ICCS) { 1771 u_char msg; 1772 1773 sc->sc_flags &= ~NCR_ICCS; 1774 1775 if (!(sc->sc_espintr & NCRINTR_DONE)) { 1776 printf("%s: ICCS: " 1777 ": [intr %x, stat %x, step %x]\n", 1778 sc->sc_dev.dv_xname, 1779 sc->sc_espintr, sc->sc_espstat, 1780 sc->sc_espstep); 1781 } 1782 if ((NCR_READ_REG(sc, NCR_FFLAG) 1783 & NCRFIFO_FF) != 2) { 1784 int i = (NCR_READ_REG(sc, NCR_FFLAG) 1785 & NCRFIFO_FF) - 2; 1786 while (i--) 1787 (void) NCR_READ_REG(sc, 1788 NCR_FIFO); 1789 } 1790 ecb->stat = NCR_READ_REG(sc, NCR_FIFO); 1791 msg = NCR_READ_REG(sc, NCR_FIFO); 1792 NCR_PHASE(("<stat:(%x,%x)>", ecb->stat, msg)); 1793 if (msg == MSG_CMDCOMPLETE) { 1794 ecb->dleft = 1795 (ecb->flags & ECB_TENTATIVE_DONE) 1796 ? 0 1797 : sc->sc_dleft; 1798 if ((ecb->flags & ECB_SENSE) == 0) 1799 ecb->xs->resid = ecb->dleft; 1800 sc->sc_state = NCR_CMDCOMPLETE; 1801 } else 1802 printf("%s: STATUS_PHASE: msg %d\n", 1803 sc->sc_dev.dv_xname, msg); 1804 NCRCMD(sc, NCRCMD_MSGOK); 1805 continue; /* ie. wait for disconnect */ 1806 } 1807 break; 1808 default: 1809 panic("%s: invalid state: %d", 1810 sc->sc_dev.dv_xname, 1811 sc->sc_state); 1812 } 1813 1814 /* 1815 * Driver is now in state NCR_CONNECTED, i.e. we 1816 * have a current command working the SCSI bus. 1817 */ 1818 if (sc->sc_state != NCR_CONNECTED || ecb == NULL) { 1819 panic("esp no nexus"); 1820 } 1821 1822 switch (sc->sc_phase) { 1823 case MESSAGE_OUT_PHASE: 1824 NCR_PHASE(("MESSAGE_OUT_PHASE ")); 1825 ncr53c9x_msgout(sc); 1826 sc->sc_prevphase = MESSAGE_OUT_PHASE; 1827 break; 1828 case MESSAGE_IN_PHASE: 1829 NCR_PHASE(("MESSAGE_IN_PHASE ")); 1830 if (sc->sc_espintr & NCRINTR_BS) { 1831 NCRCMD(sc, NCRCMD_FLUSH); 1832 sc->sc_flags |= NCR_WAITI; 1833 NCRCMD(sc, NCRCMD_TRANS); 1834 } else if (sc->sc_espintr & NCRINTR_FC) { 1835 if ((sc->sc_flags & NCR_WAITI) == 0) { 1836 printf("%s: MSGIN: unexpected FC bit: " 1837 "[intr %x, stat %x, step %x]\n", 1838 sc->sc_dev.dv_xname, 1839 sc->sc_espintr, sc->sc_espstat, 1840 sc->sc_espstep); 1841 } 1842 sc->sc_flags &= ~NCR_WAITI; 1843 ncr53c9x_msgin(sc); 1844 } else { 1845 printf("%s: MSGIN: weird bits: " 1846 "[intr %x, stat %x, step %x]\n", 1847 sc->sc_dev.dv_xname, 1848 sc->sc_espintr, sc->sc_espstat, 1849 sc->sc_espstep); 1850 } 1851 sc->sc_prevphase = MESSAGE_IN_PHASE; 1852 break; 1853 case COMMAND_PHASE: 1854 /* 1855 * Send the command block. Normally we don't see this 1856 * phase because the SEL_ATN command takes care of 1857 * all this. However, we end up here if either the 1858 * target or we wanted exchange some more messages 1859 * first (e.g. to start negotiations). 1860 */ 1861 1862 NCR_PHASE(("COMMAND_PHASE 0x%02x (%d) ", 1863 ecb->cmd.cmd.opcode, ecb->clen)); 1864 if (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF) { 1865 NCRCMD(sc, NCRCMD_FLUSH); 1866 DELAY(1); 1867 } 1868 if (ncr53c9x_dmaselect) { 1869 size_t size; 1870 /* setup DMA transfer for command */ 1871 size = ecb->clen; 1872 sc->sc_cmdlen = size; 1873 sc->sc_cmdp = (caddr_t)&ecb->cmd.cmd; 1874 NCRDMA_SETUP(sc, &sc->sc_cmdp, &sc->sc_cmdlen, 1875 0, &size); 1876 /* Program the SCSI counter */ 1877 NCR_WRITE_REG(sc, NCR_TCL, size); 1878 NCR_WRITE_REG(sc, NCR_TCM, size >> 8); 1879 if (sc->sc_cfg2 & NCRCFG2_FE) { 1880 NCR_WRITE_REG(sc, NCR_TCH, size >> 16); 1881 } 1882 1883 NCRCMD(sc, NCRCMD_TRANS | NCRCMD_DMA); 1884 NCRDMA_GO(sc); 1885 } else { 1886 u_char *cmd = (u_char *)&ecb->cmd.cmd; 1887 int i; 1888 /* Now the command into the FIFO */ 1889 for (i = 0; i < ecb->clen; i++) 1890 NCR_WRITE_REG(sc, NCR_FIFO, *cmd++); 1891 NCRCMD(sc, NCRCMD_TRANS); 1892 } 1893 sc->sc_prevphase = COMMAND_PHASE; 1894 break; 1895 case DATA_OUT_PHASE: 1896 NCR_PHASE(("DATA_OUT_PHASE [%ld] ",(long)sc->sc_dleft)); 1897 NCRCMD(sc, NCRCMD_FLUSH); 1898 size = min(sc->sc_dleft, sc->sc_maxxfer); 1899 NCRDMA_SETUP(sc, &sc->sc_dp, &sc->sc_dleft, 1900 0, &size); 1901 sc->sc_prevphase = DATA_OUT_PHASE; 1902 goto setup_xfer; 1903 case DATA_IN_PHASE: 1904 NCR_PHASE(("DATA_IN_PHASE ")); 1905 if (sc->sc_rev == NCR_VARIANT_ESP100) 1906 NCRCMD(sc, NCRCMD_FLUSH); 1907 size = min(sc->sc_dleft, sc->sc_maxxfer); 1908 NCRDMA_SETUP(sc, &sc->sc_dp, &sc->sc_dleft, 1909 1, &size); 1910 sc->sc_prevphase = DATA_IN_PHASE; 1911 setup_xfer: 1912 /* Target returned to data phase: wipe "done" memory */ 1913 ecb->flags &= ~ECB_TENTATIVE_DONE; 1914 1915 /* Program the SCSI counter */ 1916 NCR_WRITE_REG(sc, NCR_TCL, size); 1917 NCR_WRITE_REG(sc, NCR_TCM, size >> 8); 1918 if (sc->sc_cfg2 & NCRCFG2_FE) { 1919 NCR_WRITE_REG(sc, NCR_TCH, size >> 16); 1920 } 1921 /* load the count in */ 1922 NCRCMD(sc, NCRCMD_NOP|NCRCMD_DMA); 1923 1924 /* 1925 * Note that if `size' is 0, we've already transceived 1926 * all the bytes we want but we're still in DATA PHASE. 1927 * Apparently, the device needs padding. Also, a 1928 * transfer size of 0 means "maximum" to the chip 1929 * DMA logic. 1930 */ 1931 NCRCMD(sc, 1932 (size==0?NCRCMD_TRPAD:NCRCMD_TRANS)|NCRCMD_DMA); 1933 NCRDMA_GO(sc); 1934 return 1; 1935 case STATUS_PHASE: 1936 NCR_PHASE(("STATUS_PHASE ")); 1937 sc->sc_flags |= NCR_ICCS; 1938 NCRCMD(sc, NCRCMD_ICCS); 1939 sc->sc_prevphase = STATUS_PHASE; 1940 break; 1941 case INVALID_PHASE: 1942 break; 1943 default: 1944 printf("%s: unexpected bus phase; resetting\n", 1945 sc->sc_dev.dv_xname); 1946 goto reset; 1947 } 1948 } 1949 panic("esp: should not get here.."); 1950 1951 reset: 1952 ncr53c9x_init(sc, 1); 1953 return 1; 1954 1955 finish: 1956 ncr53c9x_done(sc, ecb); 1957 goto out; 1958 1959 sched: 1960 sc->sc_state = NCR_IDLE; 1961 ncr53c9x_sched(sc); 1962 goto out; 1963 1964 out: 1965 return 1; 1966 } 1967 1968 void 1969 ncr53c9x_abort(sc, ecb) 1970 struct ncr53c9x_softc *sc; 1971 struct ncr53c9x_ecb *ecb; 1972 { 1973 1974 /* 2 secs for the abort */ 1975 ecb->timeout = NCR_ABORT_TIMEOUT; 1976 ecb->flags |= ECB_ABORT; 1977 1978 if (ecb == sc->sc_nexus) { 1979 /* 1980 * If we're still selecting, the message will be scheduled 1981 * after selection is complete. 1982 */ 1983 if (sc->sc_state == NCR_CONNECTED) 1984 ncr53c9x_sched_msgout(SEND_ABORT); 1985 1986 /* 1987 * Reschedule timeout. First, cancel a queued timeout (if any) 1988 * in case someone decides to call ncr53c9x_abort() from 1989 * elsewhere. 1990 */ 1991 untimeout(ncr53c9x_timeout, ecb); 1992 timeout(ncr53c9x_timeout, ecb, (ecb->timeout * hz) / 1000); 1993 } else { 1994 ncr53c9x_dequeue(sc, ecb); 1995 TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain); 1996 if (sc->sc_state == NCR_IDLE) 1997 ncr53c9x_sched(sc); 1998 } 1999 } 2000 2001 void 2002 ncr53c9x_timeout(arg) 2003 void *arg; 2004 { 2005 struct ncr53c9x_ecb *ecb = arg; 2006 struct scsi_xfer *xs = ecb->xs; 2007 struct scsi_link *sc_link = xs->sc_link; 2008 struct ncr53c9x_softc *sc = sc_link->adapter_softc; 2009 int s; 2010 2011 sc_print_addr(sc_link); 2012 printf("%s: timed out [ecb %p (flags 0x%x, dleft %x, stat %x)], " 2013 "<state %d, nexus %p, phase(c %x, p %x), resid %lx, " 2014 "msg(q %x,o %x) %s>", 2015 sc->sc_dev.dv_xname, 2016 ecb, ecb->flags, ecb->dleft, ecb->stat, 2017 sc->sc_state, sc->sc_nexus, sc->sc_phase, sc->sc_prevphase, 2018 (long)sc->sc_dleft, sc->sc_msgpriq, sc->sc_msgout, 2019 NCRDMA_ISACTIVE(sc) ? "DMA active" : ""); 2020 #if NCR53C9X_DEBUG > 1 2021 printf("TRACE: %s.", ecb->trace); 2022 #endif 2023 2024 s = splbio(); 2025 2026 if (ecb->flags & ECB_ABORT) { 2027 /* abort timed out */ 2028 printf(" AGAIN\n"); 2029 ncr53c9x_init(sc, 1); 2030 } else { 2031 /* abort the operation that has timed out */ 2032 printf("\n"); 2033 xs->error = XS_TIMEOUT; 2034 ncr53c9x_abort(sc, ecb); 2035 } 2036 2037 splx(s); 2038 } 2039
Indexes created Fri Sep 26 08:10:20 GMT 2025