mt.c revision 1.29
1 /* $NetBSD: mt.c,v 1.29 2014/07/25 08:10:36 dholland Exp $ */ 2 3 /*- 4 * Copyright (c) 1996-2003 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) 1988 University of Utah. 34 * Copyright (c) 1982, 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * the Systems Programming Group of the University of Utah Computer 39 * Science Department. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * from: Utah $Hdr: rd.c 1.44 92/12/26$ 66 * 67 * @(#)rd.c 8.2 (Berkeley) 5/19/94 68 */ 69 70 /* 71 * Magnetic tape driver (HP7974a, HP7978a/b, HP7979a, HP7980a, HP7980xc) 72 * Original version contributed by Mt. Xinu. 73 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 74 * Computer Science, Victoria University of Wellington 75 */ 76 77 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.29 2014/07/25 08:10:36 dholland Exp $"); 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/callout.h> 83 #include <sys/buf.h> 84 #include <sys/bufq.h> 85 #include <sys/ioctl.h> 86 #include <sys/mtio.h> 87 #include <sys/file.h> 88 #include <sys/proc.h> 89 #include <sys/tty.h> 90 #include <sys/kernel.h> 91 #include <sys/tprintf.h> 92 #include <sys/device.h> 93 #include <sys/conf.h> 94 95 #include <dev/gpib/gpibvar.h> 96 #include <dev/gpib/cs80busvar.h> 97 98 #include <dev/gpib/mtreg.h> 99 100 #ifdef DEBUG 101 int mtdebug = 0; 102 #define MDB_ANY 0xff 103 #define MDB_FOLLOW 0x01 104 #define DPRINTF(mask, str) if (mtdebug & (mask)) printf str 105 #else 106 #define DPRINTF(mask, str) /* nothing */ 107 #endif 108 109 struct mt_softc { 110 device_t sc_dev; 111 112 gpib_chipset_tag_t sc_ic; 113 gpib_handle_t sc_hdl; 114 115 int sc_slave; /* GPIB slave address (0-6) */ 116 short sc_flags; /* see below */ 117 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 118 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 119 short sc_recvtimeo; /* count of gpibsend timeouts to prevent hang */ 120 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 121 struct mt_stat sc_stat;/* status bytes last read from device */ 122 short sc_density; /* current density of tape (mtio.h format) */ 123 short sc_type; /* tape drive model (hardware IDs) */ 124 tpr_t sc_ttyp; 125 struct bufq_state *sc_tab;/* buf queue */ 126 int sc_active; 127 struct buf sc_bufstore; /* XXX buffer storage */ 128 129 struct callout sc_start_ch; 130 struct callout sc_intr_ch; 131 }; 132 133 #define MTUNIT(x) (minor(x) & 0x03) 134 135 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 136 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 137 138 int mtmatch(device_t, cfdata_t, void *); 139 void mtattach(device_t, device_t, void *); 140 141 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc), 142 mtmatch, mtattach, NULL, NULL); 143 144 int mtlookup(int, int, int); 145 void mtustart(struct mt_softc *); 146 int mtreaddsj(struct mt_softc *, int); 147 int mtcommand(dev_t, int, int); 148 149 void mtintr_callout(void *); 150 void mtstart_callout(void *); 151 152 void mtcallback(void *, int); 153 void mtstart(struct mt_softc *); 154 void mtintr(struct mt_softc *); 155 156 dev_type_open(mtopen); 157 dev_type_close(mtclose); 158 dev_type_read(mtread); 159 dev_type_write(mtwrite); 160 dev_type_ioctl(mtioctl); 161 dev_type_strategy(mtstrategy); 162 163 const struct bdevsw mt_bdevsw = { 164 .d_open = mtopen, 165 .d_close = mtclose, 166 .d_strategy = mtstrategy, 167 .d_ioctl = mtioctl, 168 .d_dump = nodump, 169 .d_psize = nosize, 170 .d_discard = nodiscard, 171 .d_flag = D_TAPE 172 }; 173 174 const struct cdevsw mt_cdevsw = { 175 .d_open = mtopen, 176 .d_close = mtclose, 177 .d_read = mtread, 178 .d_write = mtwrite, 179 .d_ioctl = mtioctl, 180 .d_stop = nostop, 181 .d_tty = notty, 182 .d_poll = nopoll, 183 .d_mmap = nommap, 184 .d_kqfilter = nokqfilter, 185 .d_discard = nodiscard, 186 .d_flag = D_TAPE 187 }; 188 189 190 extern struct cfdriver mt_cd; 191 192 struct mtinfo { 193 u_short hwid; 194 const char *desc; 195 } mtinfo[] = { 196 { MT7978ID, "7978" }, 197 { MT7979AID, "7979A" }, 198 { MT7980ID, "7980" }, 199 { MT7974AID, "7974A" }, 200 }; 201 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 202 203 204 int 205 mtlookup(int id, int slave, int punit) 206 { 207 int i; 208 209 for (i = 0; i < nmtinfo; i++) 210 if (mtinfo[i].hwid == id) 211 break; 212 if (i == nmtinfo) 213 return (-1); 214 return (0); 215 } 216 217 int 218 mtmatch(device_t parent, cfdata_t match, void *aux) 219 { 220 struct cs80bus_attach_args *ca = aux; 221 222 ca->ca_punit = 0; 223 return (mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit) == 0); 224 } 225 226 void 227 mtattach(device_t parent, device_t self, void *aux) 228 { 229 struct mt_softc *sc = device_private(self); 230 struct cs80bus_attach_args *ca = aux; 231 int type; 232 233 sc->sc_ic = ca->ca_ic; 234 sc->sc_slave = ca->ca_slave; 235 236 if ((type = mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0) 237 return; 238 239 printf(": %s tape\n", mtinfo[type].desc); 240 241 sc->sc_type = type; 242 sc->sc_flags = MTF_EXISTS; 243 244 bufq_alloc(&sc->sc_tab, "fcfs", 0); 245 callout_init(&sc->sc_start_ch, 0); 246 callout_init(&sc->sc_intr_ch, 0); 247 248 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 249 &sc->sc_hdl)) { 250 aprint_error_dev(sc->sc_dev, "can't register callback\n"); 251 return; 252 } 253 } 254 255 /* 256 * Perform a read of "Device Status Jump" register and update the 257 * status if necessary. If status is read, the given "ecmd" is also 258 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 259 * and -2 on "temporary" failure. 260 */ 261 int 262 mtreaddsj(struct mt_softc *sc, int ecmd) 263 { 264 int retval; 265 266 if (sc->sc_flags & MTF_STATTIMEO) 267 goto getstats; 268 retval = gpibrecv(sc->sc_ic, 269 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 270 MTT_DSJ, &(sc->sc_lastdsj), 1); 271 sc->sc_flags &= ~MTF_DSJTIMEO; 272 if (retval != 1) { 273 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 274 device_xname(sc->sc_dev))); 275 if (sc->sc_recvtimeo == 0) 276 sc->sc_recvtimeo = hz; 277 if (--sc->sc_recvtimeo == 0) 278 return (-1); 279 if (retval == 0) 280 sc->sc_flags |= MTF_DSJTIMEO; 281 return (-2); 282 } 283 sc->sc_recvtimeo = 0; 284 sc->sc_statindex = 0; 285 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", device_xname(sc->sc_dev), 286 sc->sc_lastdsj)); 287 sc->sc_lastecmd = ecmd; 288 switch (sc->sc_lastdsj) { 289 case 0: 290 if (ecmd & MTE_DSJ_FORCE) 291 break; 292 return (0); 293 294 case 2: 295 sc->sc_lastecmd = MTE_COMPLETE; 296 case 1: 297 break; 298 299 default: 300 printf("%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 301 sc->sc_lastdsj); 302 return (-1); 303 } 304 305 getstats: 306 retval = gpibrecv(sc->sc_ic, 307 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 308 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 309 sizeof(sc->sc_stat) - sc->sc_statindex); 310 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 311 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 312 if (sc->sc_recvtimeo == 0) 313 sc->sc_recvtimeo = hz; 314 if (--sc->sc_recvtimeo != 0) { 315 if (retval >= 0) { 316 sc->sc_statindex += retval; 317 sc->sc_flags |= MTF_STATCONT; 318 } 319 sc->sc_flags |= MTF_STATTIMEO; 320 return (-2); 321 } 322 printf("%s readdsj: can't read status", device_xname(sc->sc_dev)); 323 return (-1); 324 } 325 sc->sc_recvtimeo = 0; 326 sc->sc_statindex = 0; 327 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x", 328 device_xname(sc->sc_dev), 329 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 330 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6)); 331 if (sc->sc_lastecmd) 332 (void) gpibsend(sc->sc_ic, sc->sc_slave, 333 MTL_ECMD, &(sc->sc_lastecmd), 1); 334 return ((int) sc->sc_lastdsj); 335 } 336 337 int 338 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 339 { 340 struct mt_softc *sc; 341 int req_den; 342 int error; 343 344 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 345 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 346 return (ENXIO); 347 348 if (sc->sc_flags & MTF_OPEN) 349 return (EBUSY); 350 351 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(sc->sc_dev), 352 sc->sc_flags)); 353 354 sc->sc_flags |= MTF_OPEN; 355 sc->sc_ttyp = tprintf_open(l->l_proc); 356 if ((sc->sc_flags & MTF_ALIVE) == 0) { 357 error = mtcommand(dev, MTRESET, 0); 358 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 359 goto errout; 360 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 361 (void) mtcommand(dev, MTREW, 0); 362 } 363 for (;;) { 364 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 365 goto errout; 366 if (!(sc->sc_flags & MTF_REW)) 367 break; 368 error = kpause("mt", true, hz, NULL); 369 if (error != 0 && error != EWOULDBLOCK) { 370 error = EINTR; 371 goto errout; 372 } 373 } 374 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 375 error = EROFS; 376 goto errout; 377 } 378 if (!(sc->sc_stat1 & SR1_ONLINE)) { 379 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 380 error = EIO; 381 goto errout; 382 } 383 /* 384 * Select density: 385 * - find out what density the drive is set to 386 * (i.e. the density of the current tape) 387 * - if we are going to write 388 * - if we're not at the beginning of the tape 389 * - complain if we want to change densities 390 * - otherwise, select the mtcommand to set the density 391 * 392 * If the drive doesn't support it then don't change the recorded 393 * density. 394 * 395 * The original MOREbsd code had these additional conditions 396 * for the mid-tape change 397 * 398 * req_den != T_BADBPI && 399 * sc->sc_density != T_6250BPI 400 * 401 * which suggests that it would be possible to write multiple 402 * densities if req_den == T_BAD_BPI or the current tape 403 * density was 6250. Testing of our 7980 suggests that the 404 * device cannot change densities mid-tape. 405 * 406 * ajv (at) comp.vuw.ac.nz 407 */ 408 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 409 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 410 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 411 req_den = (dev & T_DENSEL); 412 413 if (flag & FWRITE) { 414 if (!(sc->sc_stat1 & SR1_BOT)) { 415 if (sc->sc_density != req_den) { 416 uprintf("%s: can't change density mid-tape\n", 417 device_xname(sc->sc_dev)); 418 error = EIO; 419 goto errout; 420 } 421 } 422 else { 423 int mtset_density = 424 (req_den == T_800BPI ? MTSET800BPI : ( 425 req_den == T_1600BPI ? MTSET1600BPI : ( 426 req_den == T_6250BPI ? MTSET6250BPI : ( 427 sc->sc_type == MT7980ID 428 ? MTSET6250DC 429 : MTSET6250BPI)))); 430 if (mtcommand(dev, mtset_density, 0) == 0) 431 sc->sc_density = req_den; 432 } 433 } 434 return (0); 435 errout: 436 sc->sc_flags &= ~MTF_OPEN; 437 return (error); 438 } 439 440 int 441 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 442 { 443 struct mt_softc *sc; 444 445 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 446 if (sc == NULL) 447 return (ENXIO); 448 449 if (sc->sc_flags & MTF_WRT) { 450 (void) mtcommand(dev, MTWEOF, 2); 451 (void) mtcommand(dev, MTBSF, 0); 452 } 453 if ((minor(dev) & T_NOREWIND) == 0) 454 (void) mtcommand(dev, MTREW, 0); 455 sc->sc_flags &= ~MTF_OPEN; 456 tprintf_close(sc->sc_ttyp); 457 return (0); 458 } 459 460 int 461 mtcommand(dev_t dev, int cmd, int cnt) 462 { 463 struct mt_softc *sc; 464 struct buf *bp; 465 int error = 0; 466 467 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 468 bp = &sc->sc_bufstore; 469 470 if (bp->b_cflags & BC_BUSY) 471 return (EBUSY); 472 473 bp->b_cmd = cmd; 474 bp->b_dev = dev; 475 bp->b_objlock = &buffer_lock; 476 do { 477 bp->b_cflags = BC_BUSY; 478 bp->b_flags = B_CMD; 479 bp->b_oflags = 0; 480 mtstrategy(bp); 481 biowait(bp); 482 if (bp->b_error != 0) { 483 error = (int) (unsigned) bp->b_error; 484 break; 485 } 486 } while (--cnt > 0); 487 #if 0 488 bp->b_cflags = 0 /*&= ~BC_BUSY*/; 489 #else 490 bp->b_cflags &= ~BC_BUSY; 491 #endif 492 return (error); 493 } 494 495 /* 496 * Only thing to check here is for legal record lengths (writes only). 497 */ 498 void 499 mtstrategy(struct buf *bp) 500 { 501 struct mt_softc *sc; 502 int s; 503 504 sc = device_lookup_private(&mt_cd, MTUNIT(bp->b_dev)); 505 506 DPRINTF(MDB_ANY, ("%s strategy", device_xname(sc->sc_dev))); 507 508 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 509 #define WRITE_BITS_IGNORED 8 510 #if 0 511 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 512 tprintf(sc->sc_ttyp, 513 "%s: write record must be multiple of %d\n", 514 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 515 goto error; 516 } 517 #endif 518 s = 16 * 1024; 519 if (sc->sc_stat2 & SR2_LONGREC) { 520 switch (sc->sc_density) { 521 case T_1600BPI: 522 s = 32 * 1024; 523 break; 524 525 case T_6250BPI: 526 case T_BADBPI: 527 s = 60 * 1024; 528 break; 529 } 530 } 531 if (bp->b_bcount > s) { 532 tprintf(sc->sc_ttyp, 533 "%s: write record (%d) too big: limit (%d)\n", 534 device_xname(sc->sc_dev), bp->b_bcount, s); 535 #if 0 /* XXX see above */ 536 error: 537 #endif 538 bp->b_error = EIO; 539 biodone(bp); 540 return; 541 } 542 } 543 s = splbio(); 544 bufq_put(sc->sc_tab, bp); 545 if (sc->sc_active == 0) { 546 sc->sc_active = 1; 547 mtustart(sc); 548 } 549 splx(s); 550 } 551 552 void 553 mtustart(struct mt_softc *sc) 554 { 555 556 DPRINTF(MDB_ANY, ("%s ustart", device_xname(sc->sc_dev))); 557 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 558 mtstart(sc); 559 } 560 561 void 562 mtcallback(void *v, int action) 563 { 564 struct mt_softc *sc = v; 565 566 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 567 568 switch (action) { 569 case GPIBCBF_START: 570 mtstart(sc); 571 break; 572 case GPIBCBF_INTR: 573 mtintr(sc); 574 break; 575 #ifdef DEBUG 576 default: 577 printf("mtcallback: unknown action %d\n", action); 578 break; 579 #endif 580 } 581 } 582 583 void 584 mtintr_callout(void *arg) 585 { 586 struct mt_softc *sc = arg; 587 int s = splbio(); 588 589 gpibppclear(sc->sc_ic); 590 mtintr(sc); 591 splx(s); 592 } 593 594 void 595 mtstart_callout(void *arg) 596 { 597 int s = splbio(); 598 599 mtstart((struct mt_softc *)arg); 600 splx(s); 601 } 602 603 void 604 mtstart(struct mt_softc *sc) 605 { 606 struct buf *bp; 607 short cmdcount = 1; 608 u_char cmdbuf[2]; 609 610 DPRINTF(MDB_ANY, ("%s start", device_xname(sc->sc_dev))); 611 sc->sc_flags &= ~MTF_WRT; 612 bp = bufq_peek(sc->sc_tab); 613 if ((sc->sc_flags & MTF_ALIVE) == 0 && 614 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 615 goto fatalerror; 616 617 if (sc->sc_flags & MTF_REW) { 618 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 619 goto stillrew; 620 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 621 case 0: 622 case 1: 623 stillrew: 624 if ((sc->sc_stat1 & SR1_BOT) || 625 !(sc->sc_stat1 & SR1_ONLINE)) { 626 sc->sc_flags &= ~MTF_REW; 627 break; 628 } 629 case -2: 630 /* 631 * -2 means "timeout" reading DSJ, which is probably 632 * temporary. This is considered OK when doing a NOP, 633 * but not otherwise. 634 */ 635 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 636 callout_reset(&sc->sc_start_ch, hz >> 5, 637 mtstart_callout, sc); 638 return; 639 } 640 case 2: 641 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 642 bp->b_error = EBUSY; 643 goto done; 644 } 645 goto done; 646 647 default: 648 goto fatalerror; 649 } 650 } 651 if (bp->b_flags & B_CMD) { 652 if (sc->sc_flags & MTF_PASTEOT) { 653 switch(bp->b_cmd) { 654 case MTFSF: 655 case MTWEOF: 656 case MTFSR: 657 bp->b_error = ENOSPC; 658 goto done; 659 660 case MTBSF: 661 case MTOFFL: 662 case MTBSR: 663 case MTREW: 664 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 665 break; 666 } 667 } 668 switch(bp->b_cmd) { 669 case MTFSF: 670 if (sc->sc_flags & MTF_HITEOF) 671 goto done; 672 cmdbuf[0] = MTTC_FSF; 673 break; 674 675 case MTBSF: 676 if (sc->sc_flags & MTF_HITBOF) 677 goto done; 678 cmdbuf[0] = MTTC_BSF; 679 break; 680 681 case MTOFFL: 682 sc->sc_flags |= MTF_REW; 683 cmdbuf[0] = MTTC_REWOFF; 684 break; 685 686 case MTWEOF: 687 cmdbuf[0] = MTTC_WFM; 688 break; 689 690 case MTBSR: 691 cmdbuf[0] = MTTC_BSR; 692 break; 693 694 case MTFSR: 695 cmdbuf[0] = MTTC_FSR; 696 break; 697 698 case MTREW: 699 sc->sc_flags |= MTF_REW; 700 cmdbuf[0] = MTTC_REW; 701 break; 702 703 case MTNOP: 704 /* 705 * NOP is supposed to set status bits. 706 * Force readdsj to do it. 707 */ 708 switch (mtreaddsj(sc, 709 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 710 default: 711 goto done; 712 713 case -1: 714 /* 715 * If this fails, perform a device clear 716 * to fix any protocol problems and (most 717 * likely) get the status. 718 */ 719 bp->b_cmd = MTRESET; 720 break; 721 722 case -2: 723 callout_reset(&sc->sc_start_ch, hz >> 5, 724 mtstart_callout, sc); 725 return; 726 } 727 728 case MTRESET: 729 /* 730 * 1) selected device clear (send with "-2" secondary) 731 * 2) set timeout, then wait for "service request" 732 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 733 */ 734 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 735 aprint_error_dev(sc->sc_dev, "can't reset"); 736 goto fatalerror; 737 } 738 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 739 sc); 740 gpibawait(sc->sc_ic); 741 return; 742 743 case MTSET800BPI: 744 cmdbuf[0] = MTTC_800; 745 break; 746 747 case MTSET1600BPI: 748 cmdbuf[0] = MTTC_1600; 749 break; 750 751 case MTSET6250BPI: 752 cmdbuf[0] = MTTC_6250; 753 break; 754 755 case MTSET6250DC: 756 cmdbuf[0] = MTTC_DC6250; 757 break; 758 } 759 } else { 760 if (sc->sc_flags & MTF_PASTEOT) { 761 bp->b_error = ENOSPC; 762 goto done; 763 } 764 if (bp->b_flags & B_READ) { 765 sc->sc_flags |= MTF_IO; 766 cmdbuf[0] = MTTC_READ; 767 } else { 768 sc->sc_flags |= MTF_WRT | MTF_IO; 769 cmdbuf[0] = MTTC_WRITE; 770 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 771 cmdcount = 2; 772 } 773 } 774 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 775 == cmdcount) { 776 if (sc->sc_flags & MTF_REW) 777 goto done; 778 gpibawait(sc->sc_ic); 779 return; 780 } 781 fatalerror: 782 /* 783 * If anything fails, the drive is probably hosed, so mark it not 784 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 785 * if, last we heard, it was REWinding, remember that). 786 */ 787 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 788 bp->b_error = EIO; 789 done: 790 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 791 (void)bufq_get(sc->sc_tab); 792 biodone(bp); 793 gpibrelease(sc->sc_ic, sc->sc_hdl); 794 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 795 sc->sc_active = 0; 796 else 797 mtustart(sc); 798 } 799 800 void 801 mtintr(struct mt_softc *sc) 802 { 803 struct buf *bp; 804 int slave, dir, i; 805 u_char cmdbuf[4]; 806 807 slave = sc->sc_slave; 808 809 bp = bufq_peek(sc->sc_tab); 810 if (bp == NULL) { 811 printf("%s intr: bp == NULL", device_xname(sc->sc_dev)); 812 return; 813 } 814 815 DPRINTF(MDB_ANY, ("%s intr", device_xname(sc->sc_dev))); 816 817 /* 818 * Some operation completed. Read status bytes and report errors. 819 * Clear EOF flags here `cause they're set once on specific conditions 820 * below when a command succeeds. 821 * A DSJ of 2 always means keep waiting. If the command was READ 822 * (and we're in data DMA phase) stop data transfer first. 823 */ 824 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 825 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 826 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 827 cmdbuf[0] = MTE_STOP; 828 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 829 } 830 switch (mtreaddsj(sc, 0)) { 831 case 0: 832 break; 833 834 case 1: 835 /* 836 * If we're in the middle of a READ/WRITE and have yet to 837 * start the data transfer, a DSJ of one should terminate it. 838 */ 839 sc->sc_flags &= ~MTF_IO; 840 break; 841 842 case 2: 843 (void) gpibawait(sc->sc_ic); 844 return; 845 846 case -2: 847 /* 848 * -2 means that the drive failed to respond quickly enough 849 * to the request for DSJ. It's probably just "busy" figuring 850 * it out and will know in a little bit... 851 */ 852 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 853 return; 854 855 default: 856 printf("%s intr: can't get drive stat", device_xname(sc->sc_dev)); 857 goto error; 858 } 859 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 860 i = sc->sc_stat4 & SR4_ERCLMASK; 861 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 862 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 863 (i == SR4_PROTOCOL ? "protocol" : 864 (i == SR4_SELFTEST ? "selftest" : "unknown")), 865 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 866 sc->sc_stat3, sc->sc_stat5); 867 868 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 869 callout_stop(&sc->sc_intr_ch); 870 if (sc->sc_stat3 & SR3_POWERUP) 871 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 872 goto error; 873 } 874 /* 875 * Report and clear any soft errors. 876 */ 877 if (sc->sc_stat1 & SR1_SOFTERR) { 878 printf("%s: soft error, retry %d\n", device_xname(sc->sc_dev), 879 sc->sc_stat4 & SR4_RETRYMASK); 880 sc->sc_stat1 &= ~SR1_SOFTERR; 881 } 882 /* 883 * We've initiated a read or write, but haven't actually started to 884 * DMA the data yet. At this point, the drive's ready. 885 */ 886 if (sc->sc_flags & MTF_IO) { 887 sc->sc_flags &= ~MTF_IO; 888 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 889 gpibxfer(sc->sc_ic, slave, 890 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 891 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 892 return; 893 } 894 /* 895 * Check for End Of Tape - we're allowed to hit EOT and then write (or 896 * read) one more record. If we get here and have not already hit EOT, 897 * return ENOSPC to inform the process that it's hit it. If we get 898 * here and HAVE already hit EOT, don't allow any more operations that 899 * move the tape forward. 900 */ 901 if (sc->sc_stat1 & SR1_EOT) { 902 if (sc->sc_flags & MTF_ATEOT) 903 sc->sc_flags |= MTF_PASTEOT; 904 else { 905 bp->b_error = ENOSPC; 906 sc->sc_flags |= MTF_ATEOT; 907 } 908 } 909 /* 910 * If a motion command was being executed, check for Tape Marks. 911 * If we were doing data, make sure we got the right amount, and 912 * check for hitting tape marks on reads. 913 */ 914 if (bp->b_flags & B_CMD) { 915 if (sc->sc_stat1 & SR1_EOF) { 916 if (bp->b_cmd == MTFSR) 917 sc->sc_flags |= MTF_HITEOF; 918 if (bp->b_cmd == MTBSR) 919 sc->sc_flags |= MTF_HITBOF; 920 } 921 if (bp->b_cmd == MTRESET) { 922 callout_stop(&sc->sc_intr_ch); 923 sc->sc_flags |= MTF_ALIVE; 924 } 925 } else { 926 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 927 if (i != 2) { 928 aprint_error_dev(sc->sc_dev, "intr: can't get xfer length\n"); 929 goto error; 930 } 931 i = (int) *((u_short *) cmdbuf); 932 if (i <= bp->b_bcount) { 933 if (i == 0) 934 sc->sc_flags |= MTF_HITEOF; 935 bp->b_resid = bp->b_bcount - i; 936 DPRINTF(MDB_ANY, ("%s intr: bcount %d, resid %d", 937 device_xname(sc->sc_dev), 938 bp->b_bcount, bp->b_resid)); 939 } else { 940 tprintf(sc->sc_ttyp, 941 "%s: record (%d) larger than wanted (%d)\n", 942 device_xname(sc->sc_dev), i, bp->b_bcount); 943 error: 944 sc->sc_flags &= ~MTF_IO; 945 bp->b_error = EIO; 946 } 947 } 948 /* 949 * The operation is completely done. 950 * Let the drive know with an END command. 951 */ 952 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 953 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 954 bp->b_flags &= ~B_CMD; 955 (void)bufq_get(sc->sc_tab); 956 biodone(bp); 957 gpibrelease(sc->sc_ic, sc->sc_hdl); 958 if (bufq_peek(sc->sc_tab) == NULL) 959 sc->sc_active = 0; 960 else 961 mtustart(sc); 962 } 963 964 int 965 mtread(dev_t dev, struct uio *uio, int flags) 966 { 967 return (physio(mtstrategy, NULL, dev, B_READ, minphys, uio)); 968 } 969 970 int 971 mtwrite(dev_t dev, struct uio *uio, int flags) 972 { 973 return (physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio)); 974 } 975 976 int 977 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 978 { 979 struct mtop *op; 980 int cnt; 981 982 switch (cmd) { 983 case MTIOCTOP: 984 op = (struct mtop *)data; 985 switch(op->mt_op) { 986 case MTWEOF: 987 case MTFSF: 988 case MTBSR: 989 case MTBSF: 990 case MTFSR: 991 cnt = op->mt_count; 992 break; 993 994 case MTOFFL: 995 case MTREW: 996 case MTNOP: 997 cnt = 0; 998 break; 999 1000 default: 1001 return (EINVAL); 1002 } 1003 return (mtcommand(dev, op->mt_op, cnt)); 1004 1005 case MTIOCGET: 1006 break; 1007 1008 default: 1009 return (EINVAL); 1010 } 1011 return (0); 1012 } 1013
Indexes created Fri Sep 26 08:10:20 GMT 2025