1 /* $NetBSD: mt.c,v 1.16 2002/03/15 05:55:36 gmcgarry 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 * 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 * Copyright (c) 1992, The University of Utah and 41 * the Computer Systems Laboratory at the University of Utah (CSL). 42 * All rights reserved. 43 * 44 * Permission to use, copy, modify and distribute this software is hereby 45 * granted provided that (1) source code retains these copyright, permission, 46 * and disclaimer notices, and (2) redistributions including binaries 47 * reproduce the notices in supporting documentation, and (3) all advertising 48 * materials mentioning features or use of this software display the following 49 * acknowledgement: ``This product includes software developed by the 50 * Computer Systems Laboratory at the University of Utah.'' 51 * 52 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS 53 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF 54 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 55 * 56 * CSL requests users of this software to return to csl-dist@cs.utah.edu any 57 * improvements that they make and grant CSL redistribution rights. 58 * 59 * Utah $Hdr: mt.c 1.8 95/09/12$ 60 */ 61 /* @(#)mt.c 3.9 90/07/10 mt Xinu 62 * 63 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc) 64 * Original version contributed by Mt. Xinu. 65 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 66 * Computer Science, Victoria University of Wellington 67 */ 68 69 #include <sys/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.16 2002/03/15 05:55:36 gmcgarry Exp $"); 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/callout.h> 75 #include <sys/buf.h> 76 #include <sys/ioctl.h> 77 #include <sys/mtio.h> 78 #include <sys/file.h> 79 #include <sys/proc.h> 80 #include <sys/errno.h> 81 #include <sys/syslog.h> 82 #include <sys/tty.h> 83 #include <sys/kernel.h> 84 #include <sys/tprintf.h> 85 #include <sys/device.h> 86 #include <sys/conf.h> 87 88 #include <hp300/dev/hpibvar.h> 89 90 #include <hp300/dev/mtreg.h> 91 92 struct mtinfo { 93 u_short hwid; 94 char *desc; 95 } mtinfo[] = { 96 { MT7978ID, "7978" }, 97 { MT7979AID, "7979A" }, 98 { MT7980ID, "7980" }, 99 { MT7974AID, "7974A" }, 100 }; 101 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 102 103 struct mt_softc { 104 struct device sc_dev; 105 struct callout sc_start_ch; 106 struct callout sc_intr_ch; 107 int sc_hpibno; /* logical HPIB this slave it attached to */ 108 int sc_slave; /* HPIB slave address (0-6) */ 109 short sc_flags; /* see below */ 110 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 111 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 112 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */ 113 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 114 struct mt_stat sc_stat;/* status bytes last read from device */ 115 short sc_density; /* current density of tape (mtio.h format) */ 116 short sc_type; /* tape drive model (hardware IDs) */ 117 struct hpibqueue sc_hq; /* HPIB device queue member */ 118 tpr_t sc_ttyp; 119 struct buf_queue sc_tab;/* buf queue */ 120 int sc_active; 121 struct buf sc_bufstore; /* XXX buffer storage */ 122 }; 123 124 #ifdef DEBUG 125 int mtdebug = 0; 126 #define dlog if (mtdebug) log 127 #else 128 #define dlog if (0) log 129 #endif 130 131 #define UNIT(x) (minor(x) & 3) 132 133 #define B_CMD B_XXX /* command buf instead of data */ 134 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 135 136 int mtmatch __P((struct device *, struct cfdata *, void *)); 137 void mtattach __P((struct device *, struct device *, void *)); 138 139 struct cfattach mt_ca = { 140 sizeof(struct mt_softc), mtmatch, mtattach 141 }; 142 143 extern struct cfdriver mt_cd; 144 145 int mtident __P((struct mt_softc *, struct hpibbus_attach_args *)); 146 void mtustart __P((struct mt_softc *)); 147 int mtreaddsj __P((struct mt_softc *, int)); 148 int mtcommand __P((dev_t, int, int)); 149 void spl_mtintr __P((void *)); 150 void spl_mtstart __P((void *)); 151 152 void mtstart __P((void *)); 153 void mtgo __P((void *)); 154 void mtintr __P((void *)); 155 156 bdev_decl(mt); 157 cdev_decl(mt); 158 159 int 160 mtmatch(parent, match, aux) 161 struct device *parent; 162 struct cfdata *match; 163 void *aux; 164 { 165 struct hpibbus_attach_args *ha = aux; 166 167 return (mtident(NULL, ha)); 168 } 169 170 void 171 mtattach(parent, self, aux) 172 struct device *parent, *self; 173 void *aux; 174 { 175 struct mt_softc *sc = (struct mt_softc *)self; 176 struct hpibbus_attach_args *ha = aux; 177 int unit, hpibno, slave; 178 179 if (mtident(sc, ha) == 0) { 180 printf("\n%s: impossible!\n", sc->sc_dev.dv_xname); 181 return; 182 } 183 184 unit = self->dv_unit; 185 hpibno = parent->dv_unit; 186 slave = ha->ha_slave; 187 188 BUFQ_INIT(&sc->sc_tab); 189 callout_init(&sc->sc_start_ch); 190 callout_init(&sc->sc_intr_ch); 191 192 sc->sc_hpibno = hpibno; 193 sc->sc_slave = slave; 194 sc->sc_flags = MTF_EXISTS; 195 196 /* Initialize hpib job queue entry. */ 197 sc->sc_hq.hq_softc = sc; 198 sc->sc_hq.hq_slave = sc->sc_slave; 199 sc->sc_hq.hq_start = mtstart; 200 sc->sc_hq.hq_go = mtgo; 201 sc->sc_hq.hq_intr = mtintr; 202 } 203 204 int 205 mtident(sc, ha) 206 struct mt_softc *sc; 207 struct hpibbus_attach_args *ha; 208 { 209 int i; 210 211 for (i = 0; i < nmtinfo; i++) { 212 if (ha->ha_id == mtinfo[i].hwid) { 213 if (sc != NULL) { 214 sc->sc_type = mtinfo[i].hwid; 215 printf(": %s tape\n", mtinfo[i].desc); 216 } 217 return (1); 218 } 219 } 220 return (0); 221 } 222 223 /* 224 * Perform a read of "Device Status Jump" register and update the 225 * status if necessary. If status is read, the given "ecmd" is also 226 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 227 * and -2 on "temporary" failure. 228 */ 229 int 230 mtreaddsj(sc, ecmd) 231 struct mt_softc *sc; 232 int ecmd; 233 { 234 int retval; 235 236 if (sc->sc_flags & MTF_STATTIMEO) 237 goto getstats; 238 retval = hpibrecv(sc->sc_hpibno, 239 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 240 MTT_DSJ, &(sc->sc_lastdsj), 1); 241 sc->sc_flags &= ~MTF_DSJTIMEO; 242 if (retval != 1) { 243 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ", 244 sc->sc_dev.dv_xname); 245 if (sc->sc_recvtimeo == 0) 246 sc->sc_recvtimeo = hz; 247 if (--sc->sc_recvtimeo == 0) 248 return (-1); 249 if (retval == 0) 250 sc->sc_flags |= MTF_DSJTIMEO; 251 return (-2); 252 } 253 sc->sc_recvtimeo = 0; 254 sc->sc_statindex = 0; 255 dlog(LOG_DEBUG, "%s readdsj: 0x%x", sc->sc_dev.dv_xname, 256 sc->sc_lastdsj); 257 sc->sc_lastecmd = ecmd; 258 switch (sc->sc_lastdsj) { 259 case 0: 260 if (ecmd & MTE_DSJ_FORCE) 261 break; 262 return (0); 263 264 case 2: 265 sc->sc_lastecmd = MTE_COMPLETE; 266 case 1: 267 break; 268 269 default: 270 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname, 271 sc->sc_lastdsj); 272 return (-1); 273 } 274 getstats: 275 retval = hpibrecv(sc->sc_hpibno, 276 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, 277 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex, 278 sizeof(sc->sc_stat) - sc->sc_statindex); 279 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 280 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 281 if (sc->sc_recvtimeo == 0) 282 sc->sc_recvtimeo = hz; 283 if (--sc->sc_recvtimeo != 0) { 284 if (retval >= 0) { 285 sc->sc_statindex += retval; 286 sc->sc_flags |= MTF_STATCONT; 287 } 288 sc->sc_flags |= MTF_STATTIMEO; 289 return (-2); 290 } 291 log(LOG_ERR, "%s readdsj: can't read status", 292 sc->sc_dev.dv_xname); 293 return (-1); 294 } 295 sc->sc_recvtimeo = 0; 296 sc->sc_statindex = 0; 297 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x", 298 sc->sc_dev.dv_xname, 299 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 300 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6); 301 if (sc->sc_lastecmd) 302 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, 303 MTL_ECMD, &(sc->sc_lastecmd), 1); 304 return ((int) sc->sc_lastdsj); 305 } 306 307 int 308 mtopen(dev, flag, mode, p) 309 dev_t dev; 310 int flag, mode; 311 struct proc *p; 312 { 313 int unit = UNIT(dev); 314 struct mt_softc *sc; 315 int req_den; 316 int error; 317 318 if (unit >= mt_cd.cd_ndevs || 319 (sc = mt_cd.cd_devs[unit]) == NULL || 320 (sc->sc_flags & MTF_EXISTS) == 0) 321 return (ENXIO); 322 323 dlog(LOG_DEBUG, "%s open: flags 0x%x", sc->sc_dev.dv_xname, 324 sc->sc_flags); 325 if (sc->sc_flags & MTF_OPEN) 326 return (EBUSY); 327 sc->sc_flags |= MTF_OPEN; 328 sc->sc_ttyp = tprintf_open(p); 329 if ((sc->sc_flags & MTF_ALIVE) == 0) { 330 error = mtcommand(dev, MTRESET, 0); 331 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 332 goto errout; 333 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 334 (void) mtcommand(dev, MTREW, 0); 335 } 336 for (;;) { 337 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 338 goto errout; 339 if (!(sc->sc_flags & MTF_REW)) 340 break; 341 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), 342 "mt", 0) != 0) { 343 error = EINTR; 344 goto errout; 345 } 346 } 347 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 348 error = EROFS; 349 goto errout; 350 } 351 if (!(sc->sc_stat1 & SR1_ONLINE)) { 352 uprintf("%s: not online\n", sc->sc_dev.dv_xname); 353 error = EIO; 354 goto errout; 355 } 356 /* 357 * Select density: 358 * - find out what density the drive is set to 359 * (i.e. the density of the current tape) 360 * - if we are going to write 361 * - if we're not at the beginning of the tape 362 * - complain if we want to change densities 363 * - otherwise, select the mtcommand to set the density 364 * 365 * If the drive doesn't support it then don't change the recorded 366 * density. 367 * 368 * The original MOREbsd code had these additional conditions 369 * for the mid-tape change 370 * 371 * req_den != T_BADBPI && 372 * sc->sc_density != T_6250BPI 373 * 374 * which suggests that it would be possible to write multiple 375 * densities if req_den == T_BAD_BPI or the current tape 376 * density was 6250. Testing of our 7980 suggests that the 377 * device cannot change densities mid-tape. 378 * 379 * ajv@comp.vuw.ac.nz 380 */ 381 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 382 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 383 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 384 req_den = (dev & T_DENSEL); 385 386 if (flag & FWRITE) { 387 if (!(sc->sc_stat1 & SR1_BOT)) { 388 if (sc->sc_density != req_den) { 389 uprintf("%s: can't change density mid-tape\n", 390 sc->sc_dev.dv_xname); 391 error = EIO; 392 goto errout; 393 } 394 } 395 else { 396 int mtset_density = 397 (req_den == T_800BPI ? MTSET800BPI : ( 398 req_den == T_1600BPI ? MTSET1600BPI : ( 399 req_den == T_6250BPI ? MTSET6250BPI : ( 400 sc->sc_type == MT7980ID 401 ? MTSET6250DC 402 : MTSET6250BPI)))); 403 if (mtcommand(dev, mtset_density, 0) == 0) 404 sc->sc_density = req_den; 405 } 406 } 407 return (0); 408 errout: 409 sc->sc_flags &= ~MTF_OPEN; 410 return (error); 411 } 412 413 int 414 mtclose(dev, flag, fmt, p) 415 dev_t dev; 416 int flag, fmt; 417 struct proc *p; 418 { 419 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 420 421 if (sc->sc_flags & MTF_WRT) { 422 (void) mtcommand(dev, MTWEOF, 2); 423 (void) mtcommand(dev, MTBSF, 0); 424 } 425 if ((minor(dev) & T_NOREWIND) == 0) 426 (void) mtcommand(dev, MTREW, 0); 427 sc->sc_flags &= ~MTF_OPEN; 428 tprintf_close(sc->sc_ttyp); 429 return (0); 430 } 431 432 int 433 mtcommand(dev, cmd, cnt) 434 dev_t dev; 435 int cmd; 436 int cnt; 437 { 438 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 439 struct buf *bp = &sc->sc_bufstore; 440 int error = 0; 441 442 #if 1 443 if (bp->b_flags & B_BUSY) 444 return (EBUSY); 445 #endif 446 bp->b_cmd = cmd; 447 bp->b_dev = dev; 448 do { 449 bp->b_flags = B_BUSY | B_CMD; 450 mtstrategy(bp); 451 biowait(bp); 452 if (bp->b_flags & B_ERROR) { 453 error = (int) (unsigned) bp->b_error; 454 break; 455 } 456 } while (--cnt > 0); 457 #if 0 458 bp->b_flags = 0 /*&= ~B_BUSY*/; 459 #else 460 bp->b_flags &= ~B_BUSY; 461 #endif 462 return (error); 463 } 464 465 /* 466 * Only thing to check here is for legal record lengths (writes only). 467 */ 468 void 469 mtstrategy(bp) 470 struct buf *bp; 471 { 472 struct mt_softc *sc; 473 int unit; 474 int s; 475 476 unit = UNIT(bp->b_dev); 477 sc = mt_cd.cd_devs[unit]; 478 dlog(LOG_DEBUG, "%s strategy", sc->sc_dev.dv_xname); 479 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 480 #define WRITE_BITS_IGNORED 8 481 #if 0 482 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 483 tprintf(sc->sc_ttyp, 484 "%s: write record must be multiple of %d\n", 485 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED); 486 goto error; 487 } 488 #endif 489 s = 16 * 1024; 490 if (sc->sc_stat2 & SR2_LONGREC) { 491 switch (sc->sc_density) { 492 case T_1600BPI: 493 s = 32 * 1024; 494 break; 495 496 case T_6250BPI: 497 case T_BADBPI: 498 s = 60 * 1024; 499 break; 500 } 501 } 502 if (bp->b_bcount > s) { 503 tprintf(sc->sc_ttyp, 504 "%s: write record (%ld) too big: limit (%d)\n", 505 sc->sc_dev.dv_xname, bp->b_bcount, s); 506 #if 0 /* XXX see above */ 507 error: 508 #endif 509 bp->b_flags |= B_ERROR; 510 bp->b_error = EIO; 511 biodone(bp); 512 return; 513 } 514 } 515 s = splbio(); 516 BUFQ_INSERT_TAIL(&sc->sc_tab, bp); 517 if (sc->sc_active == 0) { 518 sc->sc_active = 1; 519 mtustart(sc); 520 } 521 splx(s); 522 } 523 524 void 525 mtustart(sc) 526 struct mt_softc *sc; 527 { 528 529 dlog(LOG_DEBUG, "%s ustart", sc->sc_dev.dv_xname); 530 if (hpibreq(sc->sc_dev.dv_parent, &sc->sc_hq)) 531 mtstart(sc); 532 } 533 534 void 535 spl_mtintr(arg) 536 void *arg; 537 { 538 struct mt_softc *sc = arg; 539 int s = splbio(); 540 541 hpibppclear(sc->sc_hpibno); 542 mtintr(sc); 543 splx(s); 544 } 545 546 void 547 spl_mtstart(arg) 548 void *arg; 549 { 550 int s = splbio(); 551 552 mtstart(arg); 553 splx(s); 554 } 555 556 void 557 mtstart(arg) 558 void *arg; 559 { 560 struct mt_softc *sc = arg; 561 struct buf *bp; 562 short cmdcount = 1; 563 u_char cmdbuf[2]; 564 565 dlog(LOG_DEBUG, "%s start", sc->sc_dev.dv_xname); 566 sc->sc_flags &= ~MTF_WRT; 567 bp = BUFQ_FIRST(&sc->sc_tab); 568 if ((sc->sc_flags & MTF_ALIVE) == 0 && 569 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 570 goto fatalerror; 571 572 if (sc->sc_flags & MTF_REW) { 573 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave)) 574 goto stillrew; 575 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 576 case 0: 577 case 1: 578 stillrew: 579 if ((sc->sc_stat1 & SR1_BOT) || 580 !(sc->sc_stat1 & SR1_ONLINE)) { 581 sc->sc_flags &= ~MTF_REW; 582 break; 583 } 584 case -2: 585 /* 586 * -2 means "timeout" reading DSJ, which is probably 587 * temporary. This is considered OK when doing a NOP, 588 * but not otherwise. 589 */ 590 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 591 callout_reset(&sc->sc_start_ch, hz >> 5, 592 spl_mtstart, sc); 593 return; 594 } 595 case 2: 596 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 597 bp->b_error = EBUSY; 598 goto errdone; 599 } 600 goto done; 601 602 default: 603 goto fatalerror; 604 } 605 } 606 if (bp->b_flags & B_CMD) { 607 if (sc->sc_flags & MTF_PASTEOT) { 608 switch(bp->b_cmd) { 609 case MTFSF: 610 case MTWEOF: 611 case MTFSR: 612 bp->b_error = ENOSPC; 613 goto errdone; 614 615 case MTBSF: 616 case MTOFFL: 617 case MTBSR: 618 case MTREW: 619 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 620 break; 621 } 622 } 623 switch(bp->b_cmd) { 624 case MTFSF: 625 if (sc->sc_flags & MTF_HITEOF) 626 goto done; 627 cmdbuf[0] = MTTC_FSF; 628 break; 629 630 case MTBSF: 631 if (sc->sc_flags & MTF_HITBOF) 632 goto done; 633 cmdbuf[0] = MTTC_BSF; 634 break; 635 636 case MTOFFL: 637 sc->sc_flags |= MTF_REW; 638 cmdbuf[0] = MTTC_REWOFF; 639 break; 640 641 case MTWEOF: 642 cmdbuf[0] = MTTC_WFM; 643 break; 644 645 case MTBSR: 646 cmdbuf[0] = MTTC_BSR; 647 break; 648 649 case MTFSR: 650 cmdbuf[0] = MTTC_FSR; 651 break; 652 653 case MTREW: 654 sc->sc_flags |= MTF_REW; 655 cmdbuf[0] = MTTC_REW; 656 break; 657 658 case MTNOP: 659 /* 660 * NOP is supposed to set status bits. 661 * Force readdsj to do it. 662 */ 663 switch (mtreaddsj(sc, 664 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 665 default: 666 goto done; 667 668 case -1: 669 /* 670 * If this fails, perform a device clear 671 * to fix any protocol problems and (most 672 * likely) get the status. 673 */ 674 bp->b_cmd = MTRESET; 675 break; 676 677 case -2: 678 callout_reset(&sc->sc_start_ch, hz >> 5, 679 spl_mtstart, sc); 680 return; 681 } 682 683 case MTRESET: 684 /* 685 * 1) selected device clear (send with "-2" secondary) 686 * 2) set timeout, then wait for "service request" 687 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 688 */ 689 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){ 690 log(LOG_ERR, "%s can't reset", 691 sc->sc_dev.dv_xname); 692 goto fatalerror; 693 } 694 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc); 695 hpibawait(sc->sc_hpibno); 696 return; 697 698 case MTSET800BPI: 699 cmdbuf[0] = MTTC_800; 700 break; 701 702 case MTSET1600BPI: 703 cmdbuf[0] = MTTC_1600; 704 break; 705 706 case MTSET6250BPI: 707 cmdbuf[0] = MTTC_6250; 708 break; 709 710 case MTSET6250DC: 711 cmdbuf[0] = MTTC_DC6250; 712 break; 713 } 714 } else { 715 if (sc->sc_flags & MTF_PASTEOT) { 716 bp->b_error = ENOSPC; 717 goto errdone; 718 } 719 if (bp->b_flags & B_READ) { 720 sc->sc_flags |= MTF_IO; 721 cmdbuf[0] = MTTC_READ; 722 } else { 723 sc->sc_flags |= MTF_WRT | MTF_IO; 724 cmdbuf[0] = MTTC_WRITE; 725 cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 726 cmdcount = 2; 727 } 728 } 729 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 730 == cmdcount) { 731 if (sc->sc_flags & MTF_REW) 732 goto done; 733 hpibawait(sc->sc_hpibno); 734 return; 735 } 736 fatalerror: 737 /* 738 * If anything fails, the drive is probably hosed, so mark it not 739 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 740 * if, last we heard, it was REWinding, remember that). 741 */ 742 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 743 bp->b_error = EIO; 744 errdone: 745 bp->b_flags |= B_ERROR; 746 done: 747 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 748 BUFQ_REMOVE(&sc->sc_tab, bp); 749 biodone(bp); 750 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 751 if ((bp = BUFQ_FIRST(&sc->sc_tab)) == NULL) 752 sc->sc_active = 0; 753 else 754 mtustart(sc); 755 } 756 757 /* 758 * The Utah code had a bug which meant that the driver was unable to read. 759 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized. 760 * -- ajv@comp.vuw.ac.nz 761 */ 762 void 763 mtgo(arg) 764 void *arg; 765 { 766 struct mt_softc *sc = arg; 767 struct buf *bp; 768 int rw; 769 770 dlog(LOG_DEBUG, "%s go", sc->sc_dev.dv_xname); 771 bp = BUFQ_FIRST(&sc->sc_tab); 772 rw = bp->b_flags & B_READ; 773 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE, 774 bp->b_data, bp->b_bcount, rw, rw != 0); 775 } 776 777 void 778 mtintr(arg) 779 void *arg; 780 { 781 struct mt_softc *sc = arg; 782 struct buf *bp; 783 int i; 784 u_char cmdbuf[4]; 785 786 bp = BUFQ_FIRST(&sc->sc_tab); 787 if (bp == NULL) { 788 log(LOG_ERR, "%s intr: bp == NULL", sc->sc_dev.dv_xname); 789 return; 790 } 791 792 dlog(LOG_DEBUG, "%s intr", sc->sc_dev.dv_xname); 793 794 /* 795 * Some operation completed. Read status bytes and report errors. 796 * Clear EOF flags here `cause they're set once on specific conditions 797 * below when a command succeeds. 798 * A DSJ of 2 always means keep waiting. If the command was READ 799 * (and we're in data DMA phase) stop data transfer first. 800 */ 801 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 802 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 803 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 804 cmdbuf[0] = MTE_STOP; 805 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1); 806 } 807 switch (mtreaddsj(sc, 0)) { 808 case 0: 809 break; 810 811 case 1: 812 /* 813 * If we're in the middle of a READ/WRITE and have yet to 814 * start the data transfer, a DSJ of one should terminate it. 815 */ 816 sc->sc_flags &= ~MTF_IO; 817 break; 818 819 case 2: 820 (void) hpibawait(sc->sc_hpibno); 821 return; 822 823 case -2: 824 /* 825 * -2 means that the drive failed to respond quickly enough 826 * to the request for DSJ. It's probably just "busy" figuring 827 * it out and will know in a little bit... 828 */ 829 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc); 830 return; 831 832 default: 833 log(LOG_ERR, "%s intr: can't get drive stat", 834 sc->sc_dev.dv_xname); 835 goto error; 836 } 837 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 838 i = sc->sc_stat4 & SR4_ERCLMASK; 839 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d", 840 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" : 841 (i == SR4_PROTOCOL ? "protocol" : 842 (i == SR4_SELFTEST ? "selftest" : "unknown")), 843 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 844 sc->sc_stat3, sc->sc_stat5); 845 846 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 847 callout_stop(&sc->sc_intr_ch); 848 if (sc->sc_stat3 & SR3_POWERUP) 849 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 850 goto error; 851 } 852 /* 853 * Report and clear any soft errors. 854 */ 855 if (sc->sc_stat1 & SR1_SOFTERR) { 856 log(LOG_WARNING, "%s: soft error, retry %d\n", 857 sc->sc_dev.dv_xname, sc->sc_stat4 & SR4_RETRYMASK); 858 sc->sc_stat1 &= ~SR1_SOFTERR; 859 } 860 /* 861 * We've initiated a read or write, but haven't actually started to 862 * DMA the data yet. At this point, the drive's ready. 863 */ 864 if (sc->sc_flags & MTF_IO) { 865 sc->sc_flags &= ~MTF_IO; 866 if (hpibustart(sc->sc_hpibno)) 867 mtgo(sc); 868 return; 869 } 870 /* 871 * Check for End Of Tape - we're allowed to hit EOT and then write (or 872 * read) one more record. If we get here and have not already hit EOT, 873 * return ENOSPC to inform the process that it's hit it. If we get 874 * here and HAVE already hit EOT, don't allow any more operations that 875 * move the tape forward. 876 */ 877 if (sc->sc_stat1 & SR1_EOT) { 878 if (sc->sc_flags & MTF_ATEOT) 879 sc->sc_flags |= MTF_PASTEOT; 880 else { 881 bp->b_flags |= B_ERROR; 882 bp->b_error = ENOSPC; 883 sc->sc_flags |= MTF_ATEOT; 884 } 885 } 886 /* 887 * If a motion command was being executed, check for Tape Marks. 888 * If we were doing data, make sure we got the right amount, and 889 * check for hitting tape marks on reads. 890 */ 891 if (bp->b_flags & B_CMD) { 892 if (sc->sc_stat1 & SR1_EOF) { 893 if (bp->b_cmd == MTFSR) 894 sc->sc_flags |= MTF_HITEOF; 895 if (bp->b_cmd == MTBSR) 896 sc->sc_flags |= MTF_HITBOF; 897 } 898 if (bp->b_cmd == MTRESET) { 899 callout_stop(&sc->sc_intr_ch); 900 sc->sc_flags |= MTF_ALIVE; 901 } 902 } else { 903 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2); 904 if (i != 2) { 905 log(LOG_ERR, "%s intr: can't get xfer length\n", 906 sc->sc_dev.dv_xname); 907 goto error; 908 } 909 i = (int) *((u_short *) cmdbuf); 910 if (i <= bp->b_bcount) { 911 if (i == 0) 912 sc->sc_flags |= MTF_HITEOF; 913 bp->b_resid = bp->b_bcount - i; 914 dlog(LOG_DEBUG, "%s intr: bcount %ld, resid %ld", 915 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid); 916 } else { 917 tprintf(sc->sc_ttyp, 918 "%s: record (%d) larger than wanted (%ld)\n", 919 sc->sc_dev.dv_xname, i, bp->b_bcount); 920 error: 921 sc->sc_flags &= ~MTF_IO; 922 bp->b_error = EIO; 923 bp->b_flags |= B_ERROR; 924 } 925 } 926 /* 927 * The operation is completely done. 928 * Let the drive know with an END command. 929 */ 930 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 931 (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1); 932 bp->b_flags &= ~B_CMD; 933 BUFQ_REMOVE(&sc->sc_tab, bp); 934 biodone(bp); 935 hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq); 936 if (BUFQ_FIRST(&sc->sc_tab) == NULL) 937 sc->sc_active = 0; 938 else 939 mtustart(sc); 940 } 941 942 int 943 mtread(dev, uio, flags) 944 dev_t dev; 945 struct uio *uio; 946 int flags; 947 { 948 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 949 950 return(physio(mtstrategy, &sc->sc_bufstore, 951 dev, B_READ, minphys, uio)); 952 } 953 954 int 955 mtwrite(dev, uio, flags) 956 dev_t dev; 957 struct uio *uio; 958 int flags; 959 { 960 struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)]; 961 962 return(physio(mtstrategy, &sc->sc_bufstore, 963 dev, B_WRITE, minphys, uio)); 964 } 965 966 int 967 mtioctl(dev, cmd, data, flag, p) 968 dev_t dev; 969 u_long cmd; 970 caddr_t data; 971 int flag; 972 struct proc *p; 973 { 974 struct mtop *op; 975 int cnt; 976 977 switch (cmd) { 978 case MTIOCTOP: 979 op = (struct mtop *)data; 980 switch(op->mt_op) { 981 case MTWEOF: 982 case MTFSF: 983 case MTBSR: 984 case MTBSF: 985 case MTFSR: 986 cnt = op->mt_count; 987 break; 988 989 case MTOFFL: 990 case MTREW: 991 case MTNOP: 992 cnt = 0; 993 break; 994 995 default: 996 return (EINVAL); 997 } 998 return (mtcommand(dev, op->mt_op, cnt)); 999 1000 case MTIOCGET: 1001 break; 1002 1003 default: 1004 return (EINVAL); 1005 } 1006 return (0); 1007 } 1008 1009 /*ARGSUSED*/ 1010 int 1011 mtdump(dev, blkno, va, size) 1012 dev_t dev; 1013 daddr_t blkno; 1014 caddr_t va; 1015 size_t size; 1016 { 1017 return (ENODEV); 1018 } 1019