cac.c revision 1.11
1 /* $NetBSD: cac.c,v 1.11 2000/09/01 14:17:15 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Driver for Compaq array controllers. 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/kernel.h> 46 #include <sys/device.h> 47 #include <sys/queue.h> 48 #include <sys/proc.h> 49 #include <sys/buf.h> 50 #include <sys/endian.h> 51 #include <sys/malloc.h> 52 #include <sys/pool.h> 53 54 #include <machine/bswap.h> 55 #include <machine/bus.h> 56 57 #include <dev/ic/cacreg.h> 58 #include <dev/ic/cacvar.h> 59 60 static struct cac_ccb *cac_ccb_alloc(struct cac_softc *, int); 61 static void cac_ccb_done(struct cac_softc *, struct cac_ccb *); 62 static void cac_ccb_free(struct cac_softc *, struct cac_ccb *); 63 static void cac_ccb_poll(struct cac_softc *, struct cac_ccb *, int); 64 static int cac_ccb_start(struct cac_softc *, struct cac_ccb *); 65 static int cac_print(void *, const char *); 66 static void cac_shutdown(void *); 67 static int cac_submatch(struct device *, struct cfdata *, void *); 68 69 static struct cac_ccb *cac_l0_completed(struct cac_softc *); 70 static int cac_l0_fifo_full(struct cac_softc *); 71 static void cac_l0_intr_enable(struct cac_softc *, int); 72 static int cac_l0_intr_pending(struct cac_softc *); 73 static void cac_l0_submit(struct cac_softc *, struct cac_ccb *); 74 75 static void *cac_sdh; /* shutdown hook */ 76 77 struct cac_linkage cac_l0 = { 78 cac_l0_completed, 79 cac_l0_fifo_full, 80 cac_l0_intr_enable, 81 cac_l0_intr_pending, 82 cac_l0_submit 83 }; 84 85 /* 86 * Initialise our interface to the controller. 87 */ 88 int 89 cac_init(struct cac_softc *sc, const char *intrstr, int startfw) 90 { 91 struct cac_controller_info cinfo; 92 struct cac_attach_args caca; 93 int error, rseg, size, i; 94 bus_dma_segment_t seg; 95 struct cac_ccb *ccb; 96 97 if (intrstr != NULL) 98 printf("%s: interrupting at %s\n", sc->sc_dv.dv_xname, 99 intrstr); 100 101 SIMPLEQ_INIT(&sc->sc_ccb_free); 102 SIMPLEQ_INIT(&sc->sc_ccb_queue); 103 104 size = sizeof(struct cac_ccb) * CAC_MAX_CCBS; 105 106 if ((error = bus_dmamem_alloc(sc->sc_dmat, size, NBPG, 0, &seg, 1, 107 &rseg, BUS_DMA_NOWAIT)) != 0) { 108 printf("%s: unable to allocate CCBs, error = %d\n", 109 sc->sc_dv.dv_xname, error); 110 return (-1); 111 } 112 113 if ((error = bus_dmamem_map(sc->sc_dmat, &seg, rseg, size, 114 (caddr_t *)&sc->sc_ccbs, 115 BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) { 116 printf("%s: unable to map CCBs, error = %d\n", 117 sc->sc_dv.dv_xname, error); 118 return (-1); 119 } 120 121 if ((error = bus_dmamap_create(sc->sc_dmat, size, size, 1, 0, 122 BUS_DMA_NOWAIT, &sc->sc_dmamap)) != 0) { 123 printf("%s: unable to create CCB DMA map, error = %d\n", 124 sc->sc_dv.dv_xname, error); 125 return (-1); 126 } 127 128 if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_dmamap, sc->sc_ccbs, 129 size, NULL, BUS_DMA_NOWAIT)) != 0) { 130 printf("%s: unable to load CCB DMA map, error = %d\n", 131 sc->sc_dv.dv_xname, error); 132 return (-1); 133 } 134 135 sc->sc_ccbs_paddr = sc->sc_dmamap->dm_segs[0].ds_addr; 136 memset(sc->sc_ccbs, 0, size); 137 ccb = (struct cac_ccb *)sc->sc_ccbs; 138 139 for (i = 0; i < CAC_MAX_CCBS; i++, ccb++) { 140 /* Create the DMA map for this CCB's data */ 141 error = bus_dmamap_create(sc->sc_dmat, CAC_MAX_XFER, 142 CAC_SG_SIZE, CAC_MAX_XFER, 0, 143 BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &ccb->ccb_dmamap_xfer); 144 145 if (error) { 146 printf("%s: can't create ccb dmamap (%d)\n", 147 sc->sc_dv.dv_xname, error); 148 break; 149 } 150 151 ccb->ccb_flags = 0; 152 ccb->ccb_paddr = sc->sc_ccbs_paddr + i * sizeof(struct cac_ccb); 153 SIMPLEQ_INSERT_TAIL(&sc->sc_ccb_free, ccb, ccb_chain); 154 } 155 156 /* Start firmware background tasks, if needed. */ 157 if (startfw) { 158 if (cac_cmd(sc, CAC_CMD_START_FIRMWARE, &cinfo, sizeof(cinfo), 159 0, 0, CAC_CCB_DATA_IN, NULL)) { 160 printf("%s: CAC_CMD_START_FIRMWARE failed\n", 161 sc->sc_dv.dv_xname); 162 return (-1); 163 } 164 } 165 166 if (cac_cmd(sc, CAC_CMD_GET_CTRL_INFO, &cinfo, sizeof(cinfo), 0, 0, 167 CAC_CCB_DATA_IN, NULL)) { 168 printf("%s: CAC_CMD_GET_CTRL_INFO failed\n", 169 sc->sc_dv.dv_xname); 170 return (-1); 171 } 172 173 for (i = 0; i < cinfo.num_drvs; i++) { 174 caca.caca_unit = i; 175 config_found_sm(&sc->sc_dv, &caca, cac_print, cac_submatch); 176 } 177 178 /* Set our `shutdownhook' before we start any device activity. */ 179 if (cac_sdh == NULL) 180 cac_sdh = shutdownhook_establish(cac_shutdown, NULL); 181 182 (*sc->sc_cl->cl_intr_enable)(sc, CAC_INTR_ENABLE); 183 return (0); 184 } 185 186 /* 187 * Shut down all `cac' controllers. 188 */ 189 static void 190 cac_shutdown(void *cookie) 191 { 192 extern struct cfdriver cac_cd; 193 struct cac_softc *sc; 194 u_int8_t buf[512]; 195 int i; 196 197 for (i = 0; i < cac_cd.cd_ndevs; i++) { 198 if ((sc = device_lookup(&cac_cd, i)) == NULL) 199 continue; 200 memset(buf, 0, sizeof(buf)); 201 buf[0] = 1; 202 cac_cmd(sc, CAC_CMD_FLUSH_CACHE, buf, sizeof(buf), 0, 0, 203 CAC_CCB_DATA_OUT, NULL); 204 } 205 } 206 207 /* 208 * Print autoconfiguration message for a sub-device. 209 */ 210 static int 211 cac_print(void *aux, const char *pnp) 212 { 213 struct cac_attach_args *caca; 214 215 caca = (struct cac_attach_args *)aux; 216 217 if (pnp != NULL) 218 printf("block device at %s", pnp); 219 printf(" unit %d", caca->caca_unit); 220 return (UNCONF); 221 } 222 223 /* 224 * Match a sub-device. 225 */ 226 static int 227 cac_submatch(struct device *parent, struct cfdata *cf, void *aux) 228 { 229 struct cac_attach_args *caca; 230 231 caca = (struct cac_attach_args *)aux; 232 233 if (cf->cacacf_unit != CACACF_UNIT_UNKNOWN && 234 cf->cacacf_unit != caca->caca_unit) 235 return (0); 236 237 return (cf->cf_attach->ca_match(parent, cf, aux)); 238 } 239 240 /* 241 * Handle an interrupt from the controller: process finished CCBs and 242 * dequeue any waiting CCBs. 243 */ 244 int 245 cac_intr(void *cookie) 246 { 247 struct cac_softc *sc; 248 struct cac_ccb *ccb; 249 250 sc = (struct cac_softc *)cookie; 251 252 if (!(*sc->sc_cl->cl_intr_pending)(sc)) { 253 #ifdef DEBUG 254 printf("%s: spurious intr\n", sc->sc_dv.dv_xname); 255 #endif 256 return (0); 257 } 258 259 while ((ccb = (*sc->sc_cl->cl_completed)(sc)) != NULL) { 260 cac_ccb_done(sc, ccb); 261 cac_ccb_start(sc, NULL); 262 } 263 264 return (1); 265 } 266 267 /* 268 * Execute a [polled] command. 269 */ 270 int 271 cac_cmd(struct cac_softc *sc, int command, void *data, int datasize, 272 int drive, int blkno, int flags, struct cac_context *context) 273 { 274 struct cac_ccb *ccb; 275 struct cac_sgb *sgb; 276 int s, i, rv, size, nsegs; 277 278 size = 0; 279 280 if ((ccb = cac_ccb_alloc(sc, 0)) == NULL) { 281 printf("%s: unable to alloc CCB", sc->sc_dv.dv_xname); 282 return (1); 283 } 284 285 if ((flags & (CAC_CCB_DATA_IN | CAC_CCB_DATA_OUT)) != 0) { 286 bus_dmamap_load(sc->sc_dmat, ccb->ccb_dmamap_xfer, 287 (void *)data, datasize, NULL, BUS_DMA_NOWAIT); 288 289 bus_dmamap_sync(sc->sc_dmat, ccb->ccb_dmamap_xfer, 0, datasize, 290 (flags & CAC_CCB_DATA_IN) != 0 ? BUS_DMASYNC_PREREAD : 291 BUS_DMASYNC_PREWRITE); 292 293 sgb = ccb->ccb_seg; 294 nsegs = min(ccb->ccb_dmamap_xfer->dm_nsegs, CAC_SG_SIZE); 295 296 for (i = 0; i < nsegs; i++, sgb++) { 297 size += ccb->ccb_dmamap_xfer->dm_segs[i].ds_len; 298 sgb->length = 299 htole32(ccb->ccb_dmamap_xfer->dm_segs[i].ds_len); 300 sgb->addr = 301 htole32(ccb->ccb_dmamap_xfer->dm_segs[i].ds_addr); 302 } 303 } else { 304 size = datasize; 305 nsegs = 0; 306 } 307 308 ccb->ccb_hdr.drive = drive; 309 ccb->ccb_hdr.size = htole16((sizeof(struct cac_req) + 310 sizeof(struct cac_sgb) * CAC_SG_SIZE) >> 2); 311 312 ccb->ccb_req.bcount = htole16(howmany(size, DEV_BSIZE)); 313 ccb->ccb_req.command = command; 314 ccb->ccb_req.sgcount = nsegs; 315 ccb->ccb_req.blkno = htole32(blkno); 316 317 ccb->ccb_flags = flags; 318 ccb->ccb_datasize = size; 319 320 if (context == NULL) { 321 memset(&ccb->ccb_context, 0, sizeof(struct cac_context)); 322 s = splbio(); 323 324 /* Synchronous commands musn't wait. */ 325 if ((*sc->sc_cl->cl_fifo_full)(sc)) { 326 cac_ccb_free(sc, ccb); 327 rv = -1; 328 } else { 329 (*sc->sc_cl->cl_submit)(sc, ccb); 330 cac_ccb_poll(sc, ccb, 2000); 331 cac_ccb_free(sc, ccb); 332 rv = 0; 333 } 334 } else { 335 memcpy(&ccb->ccb_context, context, sizeof(struct cac_context)); 336 s = splbio(); 337 rv = cac_ccb_start(sc, ccb); 338 } 339 340 splx(s); 341 return (rv); 342 } 343 344 /* 345 * Wait for the specified CCB to complete. Must be called at splbio. 346 */ 347 static void 348 cac_ccb_poll(struct cac_softc *sc, struct cac_ccb *wantccb, int timo) 349 { 350 struct cac_ccb *ccb; 351 352 timo *= 10; 353 354 do { 355 for (; timo != 0; timo--) { 356 if ((ccb = (*sc->sc_cl->cl_completed)(sc)) != NULL) 357 break; 358 DELAY(100); 359 } 360 361 if (timo == 0) 362 panic("%s: cac_ccb_poll: timeout", sc->sc_dv.dv_xname); 363 364 cac_ccb_done(sc, ccb); 365 } while (ccb != wantccb); 366 } 367 368 /* 369 * Enqueue the specifed command (if any) and attempt to start all enqueued 370 * commands. Must be called at splbio. 371 */ 372 static int 373 cac_ccb_start(struct cac_softc *sc, struct cac_ccb *ccb) 374 { 375 376 if (ccb != NULL) 377 SIMPLEQ_INSERT_TAIL(&sc->sc_ccb_queue, ccb, ccb_chain); 378 379 while ((ccb = SIMPLEQ_FIRST(&sc->sc_ccb_queue)) != NULL) { 380 if ((*sc->sc_cl->cl_fifo_full)(sc)) 381 return (-1); 382 SIMPLEQ_REMOVE_HEAD(&sc->sc_ccb_queue, ccb, ccb_chain); 383 #ifdef DIAGNOSTIC 384 ccb->ccb_flags |= CAC_CCB_ACTIVE; 385 #endif 386 (*sc->sc_cl->cl_submit)(sc, ccb); 387 } 388 389 return (0); 390 } 391 392 /* 393 * Process a finished CCB. 394 */ 395 static void 396 cac_ccb_done(struct cac_softc *sc, struct cac_ccb *ccb) 397 { 398 const char *errdvn; 399 int error; 400 401 error = 0; 402 403 #ifdef DIAGNOSTIC 404 if ((ccb->ccb_flags & CAC_CCB_ACTIVE) == 0) 405 panic("cac_ccb_done: CCB not active"); 406 ccb->ccb_flags &= ~CAC_CCB_ACTIVE; 407 #endif 408 409 if ((ccb->ccb_flags & (CAC_CCB_DATA_IN | CAC_CCB_DATA_OUT)) != 0) { 410 bus_dmamap_sync(sc->sc_dmat, ccb->ccb_dmamap_xfer, 0, 411 ccb->ccb_datasize, ccb->ccb_flags & CAC_CCB_DATA_IN ? 412 BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); 413 bus_dmamap_unload(sc->sc_dmat, ccb->ccb_dmamap_xfer); 414 } 415 416 if (ccb->ccb_context.cc_dv != NULL) 417 errdvn = ccb->ccb_context.cc_dv->dv_xname; 418 else 419 errdvn = sc->sc_dv.dv_xname; 420 421 if ((ccb->ccb_req.error & CAC_RET_SOFT_ERROR) != 0) 422 printf("%s: soft error; corrected\n", errdvn); 423 if ((ccb->ccb_req.error & CAC_RET_HARD_ERROR) != 0) { 424 error = 1; 425 printf("%s: hard error\n", errdvn); 426 } 427 if ((ccb->ccb_req.error & CAC_RET_CMD_REJECTED) != 0) { 428 error = 1; 429 printf("%s: invalid request\n", errdvn); 430 } 431 432 if (ccb->ccb_context.cc_handler != NULL) { 433 (*ccb->ccb_context.cc_handler)(ccb, error); 434 cac_ccb_free(sc, ccb); 435 } 436 } 437 438 /* 439 * Allocate a CCB. 440 */ 441 struct cac_ccb * 442 cac_ccb_alloc(struct cac_softc *sc, int nosleep) 443 { 444 struct cac_ccb *ccb; 445 int s; 446 447 s = splbio(); 448 449 for (;;) { 450 if ((ccb = SIMPLEQ_FIRST(&sc->sc_ccb_free)) != NULL) { 451 SIMPLEQ_REMOVE_HEAD(&sc->sc_ccb_free, ccb, ccb_chain); 452 break; 453 } 454 if (nosleep) { 455 ccb = NULL; 456 break; 457 } 458 tsleep(&sc->sc_ccb_free, PRIBIO, "cacccb", 0); 459 } 460 461 splx(s); 462 return (ccb); 463 } 464 465 /* 466 * Put a CCB onto the freelist. 467 */ 468 void 469 cac_ccb_free(struct cac_softc *sc, struct cac_ccb *ccb) 470 { 471 int s; 472 473 s = splbio(); 474 ccb->ccb_flags = 0; 475 SIMPLEQ_INSERT_HEAD(&sc->sc_ccb_free, ccb, ccb_chain); 476 if (SIMPLEQ_NEXT(ccb, ccb_chain) == NULL) 477 wakeup_one(&sc->sc_ccb_free); 478 splx(s); 479 } 480 481 /* 482 * Adjust the size of a transfer. 483 */ 484 void 485 cac_minphys(struct buf *bp) 486 { 487 488 if (bp->b_bcount > CAC_MAX_XFER) 489 bp->b_bcount = CAC_MAX_XFER; 490 minphys(bp); 491 } 492 493 /* 494 * Board specific linkage shared between multiple bus types. 495 */ 496 497 static int 498 cac_l0_fifo_full(struct cac_softc *sc) 499 { 500 501 return (cac_inl(sc, CAC_REG_CMD_FIFO) == 0); 502 } 503 504 static void 505 cac_l0_submit(struct cac_softc *sc, struct cac_ccb *ccb) 506 { 507 508 bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, (caddr_t)ccb - sc->sc_ccbs, 509 sizeof(struct cac_ccb), BUS_DMASYNC_PREWRITE | BUS_DMASYNC_PREREAD); 510 cac_outl(sc, CAC_REG_CMD_FIFO, ccb->ccb_paddr); 511 } 512 513 static struct cac_ccb * 514 cac_l0_completed(struct cac_softc *sc) 515 { 516 struct cac_ccb *ccb; 517 paddr_t off; 518 519 off = (cac_inl(sc, CAC_REG_DONE_FIFO) & ~3) - sc->sc_ccbs_paddr; 520 ccb = (struct cac_ccb *)(sc->sc_ccbs + off); 521 522 bus_dmamap_sync(sc->sc_dmat, sc->sc_dmamap, off, sizeof(struct cac_ccb), 523 BUS_DMASYNC_POSTWRITE | BUS_DMASYNC_POSTREAD); 524 525 return (ccb); 526 } 527 528 static int 529 cac_l0_intr_pending(struct cac_softc *sc) 530 { 531 532 return (cac_inl(sc, CAC_REG_INTR_PENDING)); 533 } 534 535 static void 536 cac_l0_intr_enable(struct cac_softc *sc, int state) 537 { 538 539 cac_outl(sc, CAC_REG_INTR_MASK, 540 state ? CAC_INTR_ENABLE : CAC_INTR_DISABLE); 541 } 542
Indexes created Tue Sep 23 07:09:52 GMT 2025