1 /* $NetBSD: mt.c,v 1.50 2009/12/05 22:34:43 pooka Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1992, The University of Utah and 34 * the Computer Systems Laboratory at the University of Utah (CSL). 35 * All rights reserved. 36 * 37 * Permission to use, copy, modify and distribute this software is hereby 38 * granted provided that (1) source code retains these copyright, permission, 39 * and disclaimer notices, and (2) redistributions including binaries 40 * reproduce the notices in supporting documentation, and (3) all advertising 41 * materials mentioning features or use of this software display the following 42 * acknowledgement: ``This product includes software developed by the 43 * Computer Systems Laboratory at the University of Utah.'' 44 * 45 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 46 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 47 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 48 * 49 * CSL requests users of this software to return to csl-dist@cs.utah.edu any 50 * improvements that they make and grant CSL redistribution rights. 51 * 52 * Utah $Hdr: mt.c 1.8 95/09/12$ 53 */ 54 /* @(#)mt.c 3.9 90/07/10 mt Xinu 55 * 56 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 57 * Original version contributed by Mt. Xinu. 58 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 59 * Computer Science, Victoria University of Wellington 60 */ 61 62 #include <sys/cdefs.h> 63 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.50 2009/12/05 22:34:43 pooka Exp $"); 64 65 #include <sys/param.h> 66 #include <sys/systm.h> 67 #include <sys/callout.h> 68 #include <sys/buf.h> 69 #include <sys/bufq.h> 70 #include <sys/ioctl.h> 71 #include <sys/mtio.h> 72 #include <sys/file.h> 73 #include <sys/proc.h> 74 #include <sys/errno.h> 75 #include <sys/syslog.h> 76 #include <sys/tty.h> 77 #include <sys/kernel.h> 78 #include <sys/tprintf.h> 79 #include <sys/device.h> 80 #include <sys/conf.h> 81 82 #include <hp300/dev/hpibvar.h> 83 84 #include <hp300/dev/mtreg.h> 85 86 #include "ioconf.h" 87 88 static const struct mtinfo { 89 u_short hwid; 90 const char *desc; 91 } mtinfo[] = { 92 { MT7978ID, "7978" }, 93 { MT7979AID, "7979A" }, 94 { MT7980ID, "7980" }, 95 { MT7974AID, "7974A" }, 96 }; 97 static const int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 98 99 struct mt_softc { 100 device_t sc_dev; 101 struct callout sc_start_ch; 102 struct callout sc_intr_ch; 103 int sc_hpibno; /* logical HPIB this slave it attached to */ 104 int sc_slave; /* HPIB slave address (0-6) */ 105 short sc_flags; /* see below */ 106 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 107 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 108 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 109 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 110 struct mt_stat sc_stat;/* status bytes last read from device */ 111 short sc_density; /* current density of tape (mtio.h format) */ 112 short sc_type; /* tape drive model (hardware IDs) */ 113 struct hpibqueue sc_hq; /* HPIB device queue member */ 114 tpr_t sc_ttyp; 115 struct bufq_state *sc_tab;/* buf queue */ 116 int sc_active; 117 }; 118 119 #ifdef DEBUG 120 int mtdebug = 0; 121 #define dlog if (mtdebug) log 122 #else 123 #define dlog if (0) log 124 #endif 125 126 #define UNIT(x) (minor(x) & 3) 127 128 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 129 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 130 131 static int mtmatch(device_t, cfdata_t, void *); 132 static void mtattach(device_t, device_t, void *); 133 134 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc), 135 mtmatch, mtattach, NULL, NULL); 136 137 static dev_type_open(mtopen); 138 static dev_type_close(mtclose); 139 static dev_type_read(mtread); 140 static dev_type_write(mtwrite); 141 static dev_type_ioctl(mtioctl); 142 static dev_type_strategy(mtstrategy); 143 144 const struct bdevsw mt_bdevsw = { 145 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 146 }; 147 148 const struct cdevsw mt_cdevsw = { 149 mtopen, mtclose, mtread, mtwrite, mtioctl, 150 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 151 }; 152 153 static int mtident(struct mt_softc *, struct hpibbus_attach_args *); 154 static void mtustart(struct mt_softc *); 155 static int mtreaddsj(struct mt_softc *, int); 156 static int mtcommand(dev_t, int, int); 157 static void spl_mtintr(void *); 158 static void spl_mtstart(void *); 159 160 static void mtstart(void *); 161 static void mtgo(void *); 162 static void mtintr(void *); 163 164 static int 165 mtmatch(device_t parent, cfdata_t cf, void *aux) 166 { 167 struct hpibbus_attach_args *ha = aux; 168 169 return mtident(NULL, ha); 170 } 171 172 static void 173 mtattach(device_t parent, device_t self, void *aux) 174 { 175 struct mt_softc *sc = device_private(self); 176 struct hpibbus_attach_args *ha = aux; 177 int unit, hpibno, slave; 178 179 sc->sc_dev = self; 180 if (mtident(sc, ha) == 0) { 181 aprint_error(": impossible!\n"); 182 return; 183 } 184 185 unit = device_unit(self); 186 hpibno = device_unit(parent); 187 slave = ha->ha_slave; 188 189 bufq_alloc(&sc->sc_tab, "fcfs", 0); 190 callout_init(&sc->sc_start_ch, 0); 191 callout_init(&sc->sc_intr_ch, 0); 192 193 sc->sc_hpibno = hpibno; 194 sc->sc_slave = slave; 195 sc->sc_flags = MTF_EXISTS; 196 197 /* Initialize hpib job queue entry. */ 198 sc->sc_hq.hq_softc = sc; 199 sc->sc_hq.hq_slave = sc->sc_slave; 200 sc->sc_hq.hq_start = mtstart; 201 sc->sc_hq.hq_go = mtgo; 202 sc->sc_hq.hq_intr = mtintr; 203 } 204 205 static int 206 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha) 207 { 208 int i; 209 210 for (i = 0; i < nmtinfo; i++) { 211 if (ha->ha_id == mtinfo[i].hwid) { 212 if (sc != NULL) { 213 sc->sc_type = mtinfo[i].hwid; 214 aprint_normal(": %s tape\n", mtinfo[i].desc); 215 } 216 return 1; 217 } 218 } 219 return 0; 220 } 221 222 /* 223 * Perform a read of "Device Status Jump" register and update the 224 * status if necessary. If status is read, the given "ecmd" is also 225 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 226 * and -2 on "temporary" failure. 227 */ 228 static int 229 mtreaddsj(struct mt_softc *sc, int ecmd) 230 { 231 int retval; 232 233 if (sc->sc_flags & MTF_STATTIMEO) 234 goto getstats; 235 retval = hpibrecv(sc->sc_hpibno, 236 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 237 MTT_DSJ, &(sc->sc_lastdsj), 1); 238 sc->sc_flags &= ~MTF_DSJTIMEO; 239 if (retval != 1) { 240 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 241 device_xname(sc->sc_dev)); 242 if (sc->sc_recvtimeo == 0) 243 sc->sc_recvtimeo = hz; 244 if (--sc->sc_recvtimeo == 0) 245 return -1; 246 if (retval == 0) 247 sc->sc_flags |= MTF_DSJTIMEO; 248 return -2; 249 } 250 sc->sc_recvtimeo = 0; 251 sc->sc_statindex = 0; 252 dlog(LOG_DEBUG, "%s readdsj: 0x%x", device_xname(sc->sc_dev), 253 sc->sc_lastdsj); 254 sc->sc_lastecmd = ecmd; 255 switch (sc->sc_lastdsj) { 256 case 0: 257 if (ecmd & MTE_DSJ_FORCE) 258 break; 259 return 0; 260 261 case 2: 262 sc->sc_lastecmd = MTE_COMPLETE; 263 case 1: 264 break; 265 266 default: 267 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 268 sc->sc_lastdsj); 269 return -1; 270 } 271 getstats: 272 retval = hpibrecv(sc->sc_hpibno, 273 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 274 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 275 sizeof(sc->sc_stat) - sc->sc_statindex); 276 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 277 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 278 if (sc->sc_recvtimeo == 0) 279 sc->sc_recvtimeo = hz; 280 if (--sc->sc_recvtimeo != 0) { 281 if (retval >= 0) { 282 sc->sc_statindex += retval; 283 sc->sc_flags |= MTF_STATCONT; 284 } 285 sc->sc_flags |= MTF_STATTIMEO; 286 return -2; 287 } 288 log(LOG_ERR, "%s readdsj: can't read status", 289 device_xname(sc->sc_dev)); 290 return -1; 291 } 292 sc->sc_recvtimeo = 0; 293 sc->sc_statindex = 0; 294 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 295 device_xname(sc->sc_dev), 296 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 297 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 298 if (sc->sc_lastecmd) 299 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 300 MTL_ECMD, &(sc->sc_lastecmd), 1); 301 return (int)sc->sc_lastdsj; 302 } 303 304 static int 305 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 306 { 307 struct mt_softc *sc; 308 int req_den; 309 int error; 310 311 sc = device_lookup_private(&mt_cd, UNIT(dev)); 312 if (sc == NULL) 313 return ENXIO; 314 315 if ((sc->sc_flags & MTF_EXISTS) == 0) 316 return ENXIO; 317 318 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev), 319 sc->sc_flags); 320 if (sc->sc_flags & MTF_OPEN) 321 return EBUSY; 322 sc->sc_flags |= MTF_OPEN; 323 sc->sc_ttyp = tprintf_open(l->l_proc); 324 if ((sc->sc_flags & MTF_ALIVE) == 0) { 325 error = mtcommand(dev, MTRESET, 0); 326 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 327 goto errout; 328 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 329 (void) mtcommand(dev, MTREW, 0); 330 } 331 for (;;) { 332 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 333 goto errout; 334 if (!(sc->sc_flags & MTF_REW)) 335 break; 336 error = kpause("mt", true, hz, NULL); 337 if (error != 0 && error != EWOULDBLOCK) { 338 error = EINTR; 339 goto errout; 340 } 341 } 342 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 343 error = EROFS; 344 goto errout; 345 } 346 if (!(sc->sc_stat1 & SR1_ONLINE)) { 347 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 348 error = EIO; 349 goto errout; 350 } 351 /* 352 * Select density: 353 * - find out what density the drive is set to 354 * (i.e. the density of the current tape) 355 * - if we are going to write 356 * - if we're not at the beginning of the tape 357 * - complain if we want to change densities 358 * - otherwise, select the mtcommand to set the density 359 * 360 * If the drive doesn't support it then don't change the recorded 361 * density. 362 * 363 * The original MOREbsd code had these additional conditions 364 * for the mid-tape change 365 * 366 * req_den != T_BADBPI && 367 * sc->sc_density != T_6250BPI 368 * 369 * which suggests that it would be possible to write multiple 370 * densities if req_den == T_BAD_BPI or the current tape 371 * density was 6250. Testing of our 7980 suggests that the 372 * device cannot change densities mid-tape. 373 * 374 * ajv@comp.vuw.ac.nz 375 */ 376 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 377 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 378 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 379 req_den = (dev & T_DENSEL); 380 381 if (flag & FWRITE) { 382 if (!(sc->sc_stat1 & SR1_BOT)) { 383 if (sc->sc_density != req_den) { 384 uprintf("%s: can't change density mid-tape\n", 385 device_xname(sc->sc_dev)); 386 error = EIO; 387 goto errout; 388 } 389 } 390 else { 391 int mtset_density = 392 (req_den == T_800BPI ? MTSET800BPI : ( 393 req_den == T_1600BPI ? MTSET1600BPI : ( 394 req_den == T_6250BPI ? MTSET6250BPI : ( 395 sc->sc_type == MT7980ID 396 ? MTSET6250DC 397 : MTSET6250BPI)))); 398 if (mtcommand(dev, mtset_density, 0) == 0) 399 sc->sc_density = req_den; 400 } 401 } 402 return 0; 403 errout: 404 sc->sc_flags &= ~MTF_OPEN; 405 return error; 406 } 407 408 static int 409 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 410 { 411 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev)); 412 413 if (sc->sc_flags & MTF_WRT) { 414 (void) mtcommand(dev, MTWEOF, 2); 415 (void) mtcommand(dev, MTBSF, 0); 416 } 417 if ((minor(dev) & T_NOREWIND) == 0) 418 (void) mtcommand(dev, MTREW, 0); 419 sc->sc_flags &= ~MTF_OPEN; 420 tprintf_close(sc->sc_ttyp); 421 return 0; 422 } 423 424 static int 425 mtcommand(dev_t dev, int cmd, int cnt) 426 { 427 int error = 0; 428 buf_t *bp; 429 430 bp = getiobuf(NULL, true); 431 bp->b_cmd = cmd; 432 bp->b_dev = dev; 433 do { 434 bp->b_cflags = BC_BUSY; 435 bp->b_flags = B_CMD; 436 bp->b_oflags = 0; 437 mtstrategy(bp); 438 biowait(bp); 439 if (bp->b_error != 0) { 440 error = bp->b_error; 441 break; 442 } 443 } while (--cnt > 0); 444 putiobuf(bp); 445 446 return error; 447 } 448 449 /* 450 * Only thing to check here is for legal record lengths (writes only). 451 */ 452 static void 453 mtstrategy(struct buf *bp) 454 { 455 struct mt_softc *sc; 456 int s; 457 458 sc = device_lookup_private(&mt_cd,UNIT(bp->b_dev)); 459 dlog(LOG_DEBUG, "%s strategy", device_xname(sc->sc_dev)); 460 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 461 #define WRITE_BITS_IGNORED 8 462 #if 0 463 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 464 tprintf(sc->sc_ttyp, 465 "%s: write record must be multiple of %d\n", 466 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 467 goto error; 468 } 469 #endif 470 s = 16 * 1024; 471 if (sc->sc_stat2 & SR2_LONGREC) { 472 switch (sc->sc_density) { 473 case T_1600BPI: 474 s = 32 * 1024; 475 break; 476 477 case T_6250BPI: 478 case T_BADBPI: 479 s = 60 * 1024; 480 break; 481 } 482 } 483 if (bp->b_bcount > s) { 484 tprintf(sc->sc_ttyp, 485 "%s: write record (%d) too big: limit (%d)\n", 486 device_xname(sc->sc_dev), bp->b_bcount, s); 487 #if 0 /* XXX see above */ 488 error: 489 #endif 490 bp->b_error = EIO; 491 biodone(bp); 492 return; 493 } 494 } 495 s = splbio(); 496 bufq_put(sc->sc_tab, bp); 497 if (sc->sc_active == 0) { 498 sc->sc_active = 1; 499 mtustart(sc); 500 } 501 splx(s); 502 } 503 504 static void 505 mtustart(struct mt_softc *sc) 506 { 507 508 dlog(LOG_DEBUG, "%s ustart", device_xname(sc->sc_dev)); 509 if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq)) 510 mtstart(sc); 511 } 512 513 static void 514 spl_mtintr(void *arg) 515 { 516 struct mt_softc *sc = arg; 517 int s = splbio(); 518 519 hpibppclear(sc->sc_hpibno); 520 mtintr(sc); 521 splx(s); 522 } 523 524 static void 525 spl_mtstart(void *arg) 526 { 527 int s = splbio(); 528 529 mtstart(arg); 530 splx(s); 531 } 532 533 static void 534 mtstart(void *arg) 535 { 536 struct mt_softc *sc = arg; 537 struct buf *bp; 538 short cmdcount = 1; 539 u_char cmdbuf[2]; 540 541 dlog(LOG_DEBUG, "%s start", device_xname(sc->sc_dev)); 542 sc->sc_flags &= ~MTF_WRT; 543 bp = bufq_peek(sc->sc_tab); 544 if ((sc->sc_flags & MTF_ALIVE) == 0 && 545 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 546 goto fatalerror; 547 548 if (sc->sc_flags & MTF_REW) { 549 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 550 goto stillrew; 551 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 552 case 0: 553 case 1: 554 stillrew: 555 if ((sc->sc_stat1 & SR1_BOT) || 556 !(sc->sc_stat1 & SR1_ONLINE)) { 557 sc->sc_flags &= ~MTF_REW; 558 break; 559 } 560 case -2: 561 /* 562 * -2 means "timeout" reading DSJ, which is probably 563 * temporary. This is considered OK when doing a NOP, 564 * but not otherwise. 565 */ 566 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 567 callout_reset(&sc->sc_start_ch, hz >> 5, 568 spl_mtstart, sc); 569 return; 570 } 571 case 2: 572 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 573 bp->b_error = EBUSY; 574 goto done; 575 } 576 goto done; 577 578 default: 579 goto fatalerror; 580 } 581 } 582 if (bp->b_flags & B_CMD) { 583 if (sc->sc_flags & MTF_PASTEOT) { 584 switch(bp->b_cmd) { 585 case MTFSF: 586 case MTWEOF: 587 case MTFSR: 588 bp->b_error = ENOSPC; 589 goto done; 590 591 case MTBSF: 592 case MTOFFL: 593 case MTBSR: 594 case MTREW: 595 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 596 break; 597 } 598 } 599 switch(bp->b_cmd) { 600 case MTFSF: 601 if (sc->sc_flags & MTF_HITEOF) 602 goto done; 603 cmdbuf[0] = MTTC_FSF; 604 break; 605 606 case MTBSF: 607 if (sc->sc_flags & MTF_HITBOF) 608 goto done; 609 cmdbuf[0] = MTTC_BSF; 610 break; 611 612 case MTOFFL: 613 sc->sc_flags |= MTF_REW; 614 cmdbuf[0] = MTTC_REWOFF; 615 break; 616 617 case MTWEOF: 618 cmdbuf[0] = MTTC_WFM; 619 break; 620 621 case MTBSR: 622 cmdbuf[0] = MTTC_BSR; 623 break; 624 625 case MTFSR: 626 cmdbuf[0] = MTTC_FSR; 627 break; 628 629 case MTREW: 630 sc->sc_flags |= MTF_REW; 631 cmdbuf[0] = MTTC_REW; 632 break; 633 634 case MTNOP: 635 /* 636 * NOP is supposed to set status bits. 637 * Force readdsj to do it. 638 */ 639 switch (mtreaddsj(sc, 640 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 641 default: 642 goto done; 643 644 case -1: 645 /* 646 * If this fails, perform a device clear 647 * to fix any protocol problems and (most 648 * likely) get the status. 649 */ 650 bp->b_cmd = MTRESET; 651 break; 652 653 case -2: 654 callout_reset(&sc->sc_start_ch, hz >> 5, 655 spl_mtstart, sc); 656 return; 657 } 658 659 case MTRESET: 660 /* 661 * 1) selected device clear (send with "-2" secondary) 662 * 2) set timeout, then wait for "service request" 663 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 664 */ 665 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 666 log(LOG_ERR, "%s can't reset", 667 device_xname(sc->sc_dev)); 668 goto fatalerror; 669 } 670 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 671 hpibawait(sc->sc_hpibno); 672 return; 673 674 case MTSET800BPI: 675 cmdbuf[0] = MTTC_800; 676 break; 677 678 case MTSET1600BPI: 679 cmdbuf[0] = MTTC_1600; 680 break; 681 682 case MTSET6250BPI: 683 cmdbuf[0] = MTTC_6250; 684 break; 685 686 case MTSET6250DC: 687 cmdbuf[0] = MTTC_DC6250; 688 break; 689 } 690 } else { 691 if (sc->sc_flags & MTF_PASTEOT) { 692 bp->b_error = ENOSPC; 693 goto done; 694 } 695 if (bp->b_flags & B_READ) { 696 sc->sc_flags |= MTF_IO; 697 cmdbuf[0] = MTTC_READ; 698 } else { 699 sc->sc_flags |= MTF_WRT | MTF_IO; 700 cmdbuf[0] = MTTC_WRITE; 701 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 702 cmdcount = 2; 703 } 704 } 705 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 706 == cmdcount) { 707 if (sc->sc_flags & MTF_REW) 708 goto done; 709 hpibawait(sc->sc_hpibno); 710 return; 711 } 712 fatalerror: 713 /* 714 * If anything fails, the drive is probably hosed, so mark it not 715 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 716 * if, last we heard, it was REWinding, remember that). 717 */ 718 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 719 bp->b_error = EIO; 720 done: 721 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 722 (void)bufq_get(sc->sc_tab); 723 biodone(bp); 724 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 725 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 726 sc->sc_active = 0; 727 else 728 mtustart(sc); 729 } 730 731 /* 732 * The Utah code had a bug which meant that the driver was unable to read. 733 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 734 * -- ajv@comp.vuw.ac.nz 735 */ 736 static void 737 mtgo(void *arg) 738 { 739 struct mt_softc *sc = arg; 740 struct buf *bp; 741 int rw; 742 743 dlog(LOG_DEBUG, "%s go", device_xname(sc->sc_dev)); 744 bp = bufq_peek(sc->sc_tab); 745 rw = bp->b_flags & B_READ; 746 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 747 bp->b_data, bp->b_bcount, rw, rw != 0); 748 } 749 750 static void 751 mtintr(void *arg) 752 { 753 struct mt_softc *sc = arg; 754 struct buf *bp; 755 int i; 756 u_char cmdbuf[4]; 757 758 bp = bufq_peek(sc->sc_tab); 759 if (bp == NULL) { 760 log(LOG_ERR, "%s intr: bp == NULL", device_xname(sc->sc_dev)); 761 return; 762 } 763 764 dlog(LOG_DEBUG, "%s intr", device_xname(sc->sc_dev)); 765 766 /* 767 * Some operation completed. Read status bytes and report errors. 768 * Clear EOF flags here `cause they're set once on specific conditions 769 * below when a command succeeds. 770 * A DSJ of 2 always means keep waiting. If the command was READ 771 * (and we're in data DMA phase) stop data transfer first. 772 */ 773 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 774 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 775 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 776 cmdbuf[0] = MTE_STOP; 777 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 778 } 779 switch (mtreaddsj(sc, 0)) { 780 case 0: 781 break; 782 783 case 1: 784 /* 785 * If we're in the middle of a READ/WRITE and have yet to 786 * start the data transfer, a DSJ of one should terminate it. 787 */ 788 sc->sc_flags &= ~MTF_IO; 789 break; 790 791 case 2: 792 (void) hpibawait(sc->sc_hpibno); 793 return; 794 795 case -2: 796 /* 797 * -2 means that the drive failed to respond quickly enough 798 * to the request for DSJ. It's probably just "busy" figuring 799 * it out and will know in a little bit... 800 */ 801 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 802 return; 803 804 default: 805 log(LOG_ERR, "%s intr: can't get drive stat", 806 device_xname(sc->sc_dev)); 807 goto error; 808 } 809 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 810 i = sc->sc_stat4 & SR4_ERCLMASK; 811 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 812 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 813 (i == SR4_PROTOCOL ? "protocol" : 814 (i == SR4_SELFTEST ? "selftest" : "unknown")), 815 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 816 sc->sc_stat3, sc->sc_stat5); 817 818 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 819 callout_stop(&sc->sc_intr_ch); 820 if (sc->sc_stat3 & SR3_POWERUP) 821 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 822 goto error; 823 } 824 /* 825 * Report and clear any soft errors. 826 */ 827 if (sc->sc_stat1 & SR1_SOFTERR) { 828 log(LOG_WARNING, "%s: soft error, retry %d\n", 829 device_xname(sc->sc_dev), sc->sc_stat4 & SR4_RETRYMASK); 830 sc->sc_stat1 &= ~SR1_SOFTERR; 831 } 832 /* 833 * We've initiated a read or write, but haven't actually started to 834 * DMA the data yet. At this point, the drive's ready. 835 */ 836 if (sc->sc_flags & MTF_IO) { 837 sc->sc_flags &= ~MTF_IO; 838 if (hpibustart(sc->sc_hpibno)) 839 mtgo(sc); 840 return; 841 } 842 /* 843 * Check for End Of Tape - we're allowed to hit EOT and then write (or 844 * read) one more record. If we get here and have not already hit EOT, 845 * return ENOSPC to inform the process that it's hit it. If we get 846 * here and HAVE already hit EOT, don't allow any more operations that 847 * move the tape forward. 848 */ 849 if (sc->sc_stat1 & SR1_EOT) { 850 if (sc->sc_flags & MTF_ATEOT) 851 sc->sc_flags |= MTF_PASTEOT; 852 else { 853 bp->b_error = ENOSPC; 854 sc->sc_flags |= MTF_ATEOT; 855 } 856 } 857 /* 858 * If a motion command was being executed, check for Tape Marks. 859 * If we were doing data, make sure we got the right amount, and 860 * check for hitting tape marks on reads. 861 */ 862 if (bp->b_flags & B_CMD) { 863 if (sc->sc_stat1 & SR1_EOF) { 864 if (bp->b_cmd == MTFSR) 865 sc->sc_flags |= MTF_HITEOF; 866 if (bp->b_cmd == MTBSR) 867 sc->sc_flags |= MTF_HITBOF; 868 } 869 if (bp->b_cmd == MTRESET) { 870 callout_stop(&sc->sc_intr_ch); 871 sc->sc_flags |= MTF_ALIVE; 872 } 873 } else { 874 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 875 if (i != 2) { 876 log(LOG_ERR, "%s intr: can't get xfer length\n", 877 device_xname(sc->sc_dev)); 878 goto error; 879 } 880 i = (int) *((u_short *) cmdbuf); 881 if (i <= bp->b_bcount) { 882 if (i == 0) 883 sc->sc_flags |= MTF_HITEOF; 884 bp->b_resid = bp->b_bcount - i; 885 dlog(LOG_DEBUG, "%s intr: bcount %d, resid %d", 886 device_xname(sc->sc_dev), bp->b_bcount, 887 bp->b_resid); 888 } else { 889 tprintf(sc->sc_ttyp, 890 "%s: record (%d) larger than wanted (%d)\n", 891 device_xname(sc->sc_dev), i, bp->b_bcount); 892 error: 893 sc->sc_flags &= ~MTF_IO; 894 bp->b_error = EIO; 895 } 896 } 897 /* 898 * The operation is completely done. 899 * Let the drive know with an END command. 900 */ 901 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 902 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 903 bp->b_flags &= ~B_CMD; 904 (void)bufq_get(sc->sc_tab); 905 biodone(bp); 906 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq); 907 if (bufq_peek(sc->sc_tab) == NULL) 908 sc->sc_active = 0; 909 else 910 mtustart(sc); 911 } 912 913 static int 914 mtread(dev_t dev, struct uio *uio, int flags) 915 { 916 917 return physio(mtstrategy, NULL, dev, B_READ, minphys, uio); 918 } 919 920 static int 921 mtwrite(dev_t dev, struct uio *uio, int flags) 922 { 923 924 return physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio); 925 } 926 927 static int 928 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 929 { 930 struct mtop *op; 931 int cnt; 932 933 switch (cmd) { 934 case MTIOCTOP: 935 op = (struct mtop *)data; 936 switch(op->mt_op) { 937 case MTWEOF: 938 case MTFSF: 939 case MTBSR: 940 case MTBSF: 941 case MTFSR: 942 cnt = op->mt_count; 943 break; 944 945 case MTOFFL: 946 case MTREW: 947 case MTNOP: 948 cnt = 0; 949 break; 950 951 default: 952 return EINVAL; 953 } 954 return mtcommand(dev, op->mt_op, cnt); 955 956 case MTIOCGET: 957 break; 958 959 default: 960 return EINVAL; 961 } 962 return 0; 963 } 964