mt.c revision 1.31.4.2
1 /* $NetBSD: mt.c,v 1.31.4.2 2020/04/08 14:08:04 martin 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 1.31.4.2 2020/04/08 14:08:04 martin 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 #include "ioconf.h" 101 102 #ifdef DEBUG 103 int mtdebug = 0; 104 #define MDB_ANY 0xff 105 #define MDB_FOLLOW 0x01 106 #define DPRINTF(mask, str) if (mtdebug & (mask)) printf str 107 #else 108 #define DPRINTF(mask, str) /* nothing */ 109 #endif 110 111 struct mt_softc { 112 device_t sc_dev; 113 114 gpib_chipset_tag_t sc_ic; 115 gpib_handle_t sc_hdl; 116 117 int sc_slave; /* GPIB slave address (0-6) */ 118 short sc_flags; /* see below */ 119 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 120 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 121 short sc_recvtimeo; /* count of gpibsend timeouts to prevent hang */ 122 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 123 struct mt_stat sc_stat;/* status bytes last read from device */ 124 short sc_density; /* current density of tape (mtio.h format) */ 125 short sc_type; /* tape drive model (hardware IDs) */ 126 tpr_t sc_ttyp; 127 struct bufq_state *sc_tab;/* buf queue */ 128 int sc_active; 129 struct buf sc_bufstore; /* XXX buffer storage */ 130 131 struct callout sc_start_ch; 132 struct callout sc_intr_ch; 133 }; 134 135 #define MTUNIT(x) (minor(x) & 0x03) 136 137 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 138 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 139 140 int mtmatch(device_t, cfdata_t, void *); 141 void mtattach(device_t, device_t, void *); 142 143 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc), 144 mtmatch, mtattach, NULL, NULL); 145 146 int mtlookup(int, int, int); 147 void mtustart(struct mt_softc *); 148 int mtreaddsj(struct mt_softc *, int); 149 int mtcommand(dev_t, int, int); 150 151 void mtintr_callout(void *); 152 void mtstart_callout(void *); 153 154 void mtcallback(void *, int); 155 void mtstart(struct mt_softc *); 156 void mtintr(struct mt_softc *); 157 158 dev_type_open(mtopen); 159 dev_type_close(mtclose); 160 dev_type_read(mtread); 161 dev_type_write(mtwrite); 162 dev_type_ioctl(mtioctl); 163 dev_type_strategy(mtstrategy); 164 165 const struct bdevsw mt_bdevsw = { 166 .d_open = mtopen, 167 .d_close = mtclose, 168 .d_strategy = mtstrategy, 169 .d_ioctl = mtioctl, 170 .d_dump = nodump, 171 .d_psize = nosize, 172 .d_discard = nodiscard, 173 .d_flag = D_TAPE 174 }; 175 176 const struct cdevsw mt_cdevsw = { 177 .d_open = mtopen, 178 .d_close = mtclose, 179 .d_read = mtread, 180 .d_write = mtwrite, 181 .d_ioctl = mtioctl, 182 .d_stop = nostop, 183 .d_tty = notty, 184 .d_poll = nopoll, 185 .d_mmap = nommap, 186 .d_kqfilter = nokqfilter, 187 .d_discard = nodiscard, 188 .d_flag = D_TAPE 189 }; 190 191 192 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 aprint_naive("\n"); 240 aprint_normal(": %s tape\n", mtinfo[type].desc); 241 242 sc->sc_type = type; 243 sc->sc_flags = MTF_EXISTS; 244 245 bufq_alloc(&sc->sc_tab, "fcfs", 0); 246 callout_init(&sc->sc_start_ch, 0); 247 callout_init(&sc->sc_intr_ch, 0); 248 249 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 250 &sc->sc_hdl)) { 251 aprint_error_dev(sc->sc_dev, "can't register callback\n"); 252 return; 253 } 254 } 255 256 /* 257 * Perform a read of "Device Status Jump" register and update the 258 * status if necessary. If status is read, the given "ecmd" is also 259 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 260 * and -2 on "temporary" failure. 261 */ 262 int 263 mtreaddsj(struct mt_softc *sc, int ecmd) 264 { 265 int retval; 266 267 if (sc->sc_flags & MTF_STATTIMEO) 268 goto getstats; 269 retval = gpibrecv(sc->sc_ic, 270 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 271 MTT_DSJ, &(sc->sc_lastdsj), 1); 272 sc->sc_flags &= ~MTF_DSJTIMEO; 273 if (retval != 1) { 274 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 275 device_xname(sc->sc_dev))); 276 if (sc->sc_recvtimeo == 0) 277 sc->sc_recvtimeo = hz; 278 if (--sc->sc_recvtimeo == 0) 279 return (-1); 280 if (retval == 0) 281 sc->sc_flags |= MTF_DSJTIMEO; 282 return (-2); 283 } 284 sc->sc_recvtimeo = 0; 285 sc->sc_statindex = 0; 286 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", device_xname(sc->sc_dev), 287 sc->sc_lastdsj)); 288 sc->sc_lastecmd = ecmd; 289 switch (sc->sc_lastdsj) { 290 case 0: 291 if (ecmd & MTE_DSJ_FORCE) 292 break; 293 return (0); 294 295 case 2: 296 sc->sc_lastecmd = MTE_COMPLETE; 297 case 1: 298 break; 299 300 default: 301 printf("%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 302 sc->sc_lastdsj); 303 return (-1); 304 } 305 306 getstats: 307 retval = gpibrecv(sc->sc_ic, 308 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 309 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 310 sizeof(sc->sc_stat) - sc->sc_statindex); 311 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 312 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 313 if (sc->sc_recvtimeo == 0) 314 sc->sc_recvtimeo = hz; 315 if (--sc->sc_recvtimeo != 0) { 316 if (retval >= 0) { 317 sc->sc_statindex += retval; 318 sc->sc_flags |= MTF_STATCONT; 319 } 320 sc->sc_flags |= MTF_STATTIMEO; 321 return (-2); 322 } 323 printf("%s readdsj: can't read status", 324 device_xname(sc->sc_dev)); 325 return (-1); 326 } 327 sc->sc_recvtimeo = 0; 328 sc->sc_statindex = 0; 329 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x", 330 device_xname(sc->sc_dev), 331 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 332 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6)); 333 if (sc->sc_lastecmd) 334 (void) gpibsend(sc->sc_ic, sc->sc_slave, 335 MTL_ECMD, &(sc->sc_lastecmd), 1); 336 return ((int) sc->sc_lastdsj); 337 } 338 339 int 340 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 341 { 342 struct mt_softc *sc; 343 int req_den; 344 int error; 345 346 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 347 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 348 return (ENXIO); 349 350 if (sc->sc_flags & MTF_OPEN) 351 return (EBUSY); 352 353 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(sc->sc_dev), 354 sc->sc_flags)); 355 356 sc->sc_flags |= MTF_OPEN; 357 sc->sc_ttyp = tprintf_open(l->l_proc); 358 if ((sc->sc_flags & MTF_ALIVE) == 0) { 359 error = mtcommand(dev, MTRESET, 0); 360 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 361 goto errout; 362 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 363 (void) mtcommand(dev, MTREW, 0); 364 } 365 for (;;) { 366 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 367 goto errout; 368 if (!(sc->sc_flags & MTF_REW)) 369 break; 370 error = kpause("mt", true, hz, NULL); 371 if (error != 0 && error != EWOULDBLOCK) { 372 error = EINTR; 373 goto errout; 374 } 375 } 376 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 377 error = EROFS; 378 goto errout; 379 } 380 if (!(sc->sc_stat1 & SR1_ONLINE)) { 381 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 382 error = EIO; 383 goto errout; 384 } 385 /* 386 * Select density: 387 * - find out what density the drive is set to 388 * (i.e. the density of the current tape) 389 * - if we are going to write 390 * - if we're not at the beginning of the tape 391 * - complain if we want to change densities 392 * - otherwise, select the mtcommand to set the density 393 * 394 * If the drive doesn't support it then don't change the recorded 395 * density. 396 * 397 * The original MOREbsd code had these additional conditions 398 * for the mid-tape change 399 * 400 * req_den != T_BADBPI && 401 * sc->sc_density != T_6250BPI 402 * 403 * which suggests that it would be possible to write multiple 404 * densities if req_den == T_BAD_BPI or the current tape 405 * density was 6250. Testing of our 7980 suggests that the 406 * device cannot change densities mid-tape. 407 * 408 * ajv (at) comp.vuw.ac.nz 409 */ 410 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 411 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 412 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 413 req_den = (dev & T_DENSEL); 414 415 if (flag & FWRITE) { 416 if (!(sc->sc_stat1 & SR1_BOT)) { 417 if (sc->sc_density != req_den) { 418 uprintf("%s: can't change density mid-tape\n", 419 device_xname(sc->sc_dev)); 420 error = EIO; 421 goto errout; 422 } 423 } 424 else { 425 int mtset_density = 426 (req_den == T_800BPI ? MTSET800BPI : ( 427 req_den == T_1600BPI ? MTSET1600BPI : ( 428 req_den == T_6250BPI ? MTSET6250BPI : ( 429 sc->sc_type == MT7980ID 430 ? MTSET6250DC 431 : MTSET6250BPI)))); 432 if (mtcommand(dev, mtset_density, 0) == 0) 433 sc->sc_density = req_den; 434 } 435 } 436 return (0); 437 errout: 438 sc->sc_flags &= ~MTF_OPEN; 439 return (error); 440 } 441 442 int 443 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 444 { 445 struct mt_softc *sc; 446 447 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 448 if (sc == NULL) 449 return (ENXIO); 450 451 if (sc->sc_flags & MTF_WRT) { 452 (void) mtcommand(dev, MTWEOF, 2); 453 (void) mtcommand(dev, MTBSF, 0); 454 } 455 if ((minor(dev) & T_NOREWIND) == 0) 456 (void) mtcommand(dev, MTREW, 0); 457 sc->sc_flags &= ~MTF_OPEN; 458 tprintf_close(sc->sc_ttyp); 459 return (0); 460 } 461 462 int 463 mtcommand(dev_t dev, int cmd, int cnt) 464 { 465 struct mt_softc *sc; 466 struct buf *bp; 467 int error = 0; 468 469 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 470 bp = &sc->sc_bufstore; 471 472 if (bp->b_cflags & BC_BUSY) 473 return (EBUSY); 474 475 bp->b_cmd = cmd; 476 bp->b_dev = dev; 477 bp->b_objlock = &buffer_lock; 478 do { 479 bp->b_cflags = BC_BUSY; 480 bp->b_flags = B_CMD; 481 bp->b_oflags = 0; 482 mtstrategy(bp); 483 biowait(bp); 484 if (bp->b_error != 0) { 485 error = (int) (unsigned) bp->b_error; 486 break; 487 } 488 } while (--cnt > 0); 489 #if 0 490 bp->b_cflags = 0 /*&= ~BC_BUSY*/; 491 #else 492 bp->b_cflags &= ~BC_BUSY; 493 #endif 494 return (error); 495 } 496 497 /* 498 * Only thing to check here is for legal record lengths (writes only). 499 */ 500 void 501 mtstrategy(struct buf *bp) 502 { 503 struct mt_softc *sc; 504 int s; 505 506 sc = device_lookup_private(&mt_cd, MTUNIT(bp->b_dev)); 507 508 DPRINTF(MDB_ANY, ("%s strategy", device_xname(sc->sc_dev))); 509 510 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 511 #define WRITE_BITS_IGNORED 8 512 #if 0 513 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 514 tprintf(sc->sc_ttyp, 515 "%s: write record must be multiple of %d\n", 516 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 517 goto error; 518 } 519 #endif 520 s = 16 * 1024; 521 if (sc->sc_stat2 & SR2_LONGREC) { 522 switch (sc->sc_density) { 523 case T_1600BPI: 524 s = 32 * 1024; 525 break; 526 527 case T_6250BPI: 528 case T_BADBPI: 529 s = 60 * 1024; 530 break; 531 } 532 } 533 if (bp->b_bcount > s) { 534 tprintf(sc->sc_ttyp, 535 "%s: write record (%d) too big: limit (%d)\n", 536 device_xname(sc->sc_dev), bp->b_bcount, s); 537 #if 0 /* XXX see above */ 538 error: 539 #endif 540 bp->b_error = EIO; 541 biodone(bp); 542 return; 543 } 544 } 545 s = splbio(); 546 bufq_put(sc->sc_tab, bp); 547 if (sc->sc_active == 0) { 548 sc->sc_active = 1; 549 mtustart(sc); 550 } 551 splx(s); 552 } 553 554 void 555 mtustart(struct mt_softc *sc) 556 { 557 558 DPRINTF(MDB_ANY, ("%s ustart", device_xname(sc->sc_dev))); 559 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 560 mtstart(sc); 561 } 562 563 void 564 mtcallback(void *v, int action) 565 { 566 struct mt_softc *sc = v; 567 568 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 569 570 switch (action) { 571 case GPIBCBF_START: 572 mtstart(sc); 573 break; 574 case GPIBCBF_INTR: 575 mtintr(sc); 576 break; 577 #ifdef DEBUG 578 default: 579 printf("mtcallback: unknown action %d\n", action); 580 break; 581 #endif 582 } 583 } 584 585 void 586 mtintr_callout(void *arg) 587 { 588 struct mt_softc *sc = arg; 589 int s = splbio(); 590 591 gpibppclear(sc->sc_ic); 592 mtintr(sc); 593 splx(s); 594 } 595 596 void 597 mtstart_callout(void *arg) 598 { 599 int s = splbio(); 600 601 mtstart((struct mt_softc *)arg); 602 splx(s); 603 } 604 605 void 606 mtstart(struct mt_softc *sc) 607 { 608 struct buf *bp; 609 short cmdcount = 1; 610 u_char cmdbuf[2]; 611 612 DPRINTF(MDB_ANY, ("%s start", device_xname(sc->sc_dev))); 613 sc->sc_flags &= ~MTF_WRT; 614 bp = bufq_peek(sc->sc_tab); 615 if ((sc->sc_flags & MTF_ALIVE) == 0 && 616 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 617 goto fatalerror; 618 619 if (sc->sc_flags & MTF_REW) { 620 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 621 goto stillrew; 622 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 623 case 0: 624 case 1: 625 stillrew: 626 if ((sc->sc_stat1 & SR1_BOT) || 627 !(sc->sc_stat1 & SR1_ONLINE)) { 628 sc->sc_flags &= ~MTF_REW; 629 break; 630 } 631 /* FALLTHROUGH */ 632 case -2: 633 /* 634 * -2 means "timeout" reading DSJ, which is probably 635 * temporary. This is considered OK when doing a NOP, 636 * but not otherwise. 637 */ 638 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 639 callout_reset(&sc->sc_start_ch, hz >> 5, 640 mtstart_callout, sc); 641 return; 642 } 643 /* FALLTHROUGH */ 644 case 2: 645 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 646 bp->b_error = EBUSY; 647 goto done; 648 } 649 goto done; 650 651 default: 652 goto fatalerror; 653 } 654 } 655 if (bp->b_flags & B_CMD) { 656 if (sc->sc_flags & MTF_PASTEOT) { 657 switch(bp->b_cmd) { 658 case MTFSF: 659 case MTWEOF: 660 case MTFSR: 661 bp->b_error = ENOSPC; 662 goto done; 663 664 case MTBSF: 665 case MTOFFL: 666 case MTBSR: 667 case MTREW: 668 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 669 break; 670 } 671 } 672 switch(bp->b_cmd) { 673 case MTFSF: 674 if (sc->sc_flags & MTF_HITEOF) 675 goto done; 676 cmdbuf[0] = MTTC_FSF; 677 break; 678 679 case MTBSF: 680 if (sc->sc_flags & MTF_HITBOF) 681 goto done; 682 cmdbuf[0] = MTTC_BSF; 683 break; 684 685 case MTOFFL: 686 sc->sc_flags |= MTF_REW; 687 cmdbuf[0] = MTTC_REWOFF; 688 break; 689 690 case MTWEOF: 691 cmdbuf[0] = MTTC_WFM; 692 break; 693 694 case MTBSR: 695 cmdbuf[0] = MTTC_BSR; 696 break; 697 698 case MTFSR: 699 cmdbuf[0] = MTTC_FSR; 700 break; 701 702 case MTREW: 703 sc->sc_flags |= MTF_REW; 704 cmdbuf[0] = MTTC_REW; 705 break; 706 707 case MTNOP: 708 /* 709 * NOP is supposed to set status bits. 710 * Force readdsj to do it. 711 */ 712 switch (mtreaddsj(sc, 713 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 714 default: 715 goto done; 716 717 case -1: 718 /* 719 * If this fails, perform a device clear 720 * to fix any protocol problems and (most 721 * likely) get the status. 722 */ 723 bp->b_cmd = MTRESET; 724 break; 725 726 case -2: 727 callout_reset(&sc->sc_start_ch, hz >> 5, 728 mtstart_callout, sc); 729 return; 730 } 731 __unreachable(); 732 733 case MTRESET: 734 /* 735 * 1) selected device clear (send with "-2" secondary) 736 * 2) set timeout, then wait for "service request" 737 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 738 */ 739 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 740 aprint_error_dev(sc->sc_dev, "can't reset"); 741 goto fatalerror; 742 } 743 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 744 sc); 745 gpibawait(sc->sc_ic); 746 return; 747 748 case MTSET800BPI: 749 cmdbuf[0] = MTTC_800; 750 break; 751 752 case MTSET1600BPI: 753 cmdbuf[0] = MTTC_1600; 754 break; 755 756 case MTSET6250BPI: 757 cmdbuf[0] = MTTC_6250; 758 break; 759 760 case MTSET6250DC: 761 cmdbuf[0] = MTTC_DC6250; 762 break; 763 } 764 } else { 765 if (sc->sc_flags & MTF_PASTEOT) { 766 bp->b_error = ENOSPC; 767 goto done; 768 } 769 if (bp->b_flags & B_READ) { 770 sc->sc_flags |= MTF_IO; 771 cmdbuf[0] = MTTC_READ; 772 } else { 773 sc->sc_flags |= MTF_WRT | MTF_IO; 774 cmdbuf[0] = MTTC_WRITE; 775 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 776 cmdcount = 2; 777 } 778 } 779 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 780 == cmdcount) { 781 if (sc->sc_flags & MTF_REW) 782 goto done; 783 gpibawait(sc->sc_ic); 784 return; 785 } 786 fatalerror: 787 /* 788 * If anything fails, the drive is probably hosed, so mark it not 789 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 790 * if, last we heard, it was REWinding, remember that). 791 */ 792 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 793 bp->b_error = EIO; 794 done: 795 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 796 (void)bufq_get(sc->sc_tab); 797 biodone(bp); 798 gpibrelease(sc->sc_ic, sc->sc_hdl); 799 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 800 sc->sc_active = 0; 801 else 802 mtustart(sc); 803 } 804 805 void 806 mtintr(struct mt_softc *sc) 807 { 808 struct buf *bp; 809 int slave, dir, i; 810 u_char cmdbuf[4]; 811 812 slave = sc->sc_slave; 813 814 bp = bufq_peek(sc->sc_tab); 815 if (bp == NULL) { 816 printf("%s intr: bp == NULL", device_xname(sc->sc_dev)); 817 return; 818 } 819 820 DPRINTF(MDB_ANY, ("%s intr", device_xname(sc->sc_dev))); 821 822 /* 823 * Some operation completed. Read status bytes and report errors. 824 * Clear EOF flags here `cause they're set once on specific conditions 825 * below when a command succeeds. 826 * A DSJ of 2 always means keep waiting. If the command was READ 827 * (and we're in data DMA phase) stop data transfer first. 828 */ 829 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 830 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 831 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 832 cmdbuf[0] = MTE_STOP; 833 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 834 } 835 switch (mtreaddsj(sc, 0)) { 836 case 0: 837 break; 838 839 case 1: 840 /* 841 * If we're in the middle of a READ/WRITE and have yet to 842 * start the data transfer, a DSJ of one should terminate it. 843 */ 844 sc->sc_flags &= ~MTF_IO; 845 break; 846 847 case 2: 848 (void) gpibawait(sc->sc_ic); 849 return; 850 851 case -2: 852 /* 853 * -2 means that the drive failed to respond quickly enough 854 * to the request for DSJ. It's probably just "busy" figuring 855 * it out and will know in a little bit... 856 */ 857 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 858 return; 859 860 default: 861 printf("%s intr: can't get drive stat", 862 device_xname(sc->sc_dev)); 863 goto error; 864 } 865 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 866 i = sc->sc_stat4 & SR4_ERCLMASK; 867 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 868 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 869 (i == SR4_PROTOCOL ? "protocol" : 870 (i == SR4_SELFTEST ? "selftest" : "unknown")), 871 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 872 sc->sc_stat3, sc->sc_stat5); 873 874 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 875 callout_stop(&sc->sc_intr_ch); 876 if (sc->sc_stat3 & SR3_POWERUP) 877 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 878 goto error; 879 } 880 /* 881 * Report and clear any soft errors. 882 */ 883 if (sc->sc_stat1 & SR1_SOFTERR) { 884 printf("%s: soft error, retry %d\n", device_xname(sc->sc_dev), 885 sc->sc_stat4 & SR4_RETRYMASK); 886 sc->sc_stat1 &= ~SR1_SOFTERR; 887 } 888 /* 889 * We've initiated a read or write, but haven't actually started to 890 * DMA the data yet. At this point, the drive's ready. 891 */ 892 if (sc->sc_flags & MTF_IO) { 893 sc->sc_flags &= ~MTF_IO; 894 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 895 gpibxfer(sc->sc_ic, slave, 896 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 897 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 898 return; 899 } 900 /* 901 * Check for End Of Tape - we're allowed to hit EOT and then write (or 902 * read) one more record. If we get here and have not already hit EOT, 903 * return ENOSPC to inform the process that it's hit it. If we get 904 * here and HAVE already hit EOT, don't allow any more operations that 905 * move the tape forward. 906 */ 907 if (sc->sc_stat1 & SR1_EOT) { 908 if (sc->sc_flags & MTF_ATEOT) 909 sc->sc_flags |= MTF_PASTEOT; 910 else { 911 bp->b_error = ENOSPC; 912 sc->sc_flags |= MTF_ATEOT; 913 } 914 } 915 /* 916 * If a motion command was being executed, check for Tape Marks. 917 * If we were doing data, make sure we got the right amount, and 918 * check for hitting tape marks on reads. 919 */ 920 if (bp->b_flags & B_CMD) { 921 if (sc->sc_stat1 & SR1_EOF) { 922 if (bp->b_cmd == MTFSR) 923 sc->sc_flags |= MTF_HITEOF; 924 if (bp->b_cmd == MTBSR) 925 sc->sc_flags |= MTF_HITBOF; 926 } 927 if (bp->b_cmd == MTRESET) { 928 callout_stop(&sc->sc_intr_ch); 929 sc->sc_flags |= MTF_ALIVE; 930 } 931 } else { 932 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 933 if (i != 2) { 934 aprint_error_dev(sc->sc_dev, 935 "intr: can't get xfer length\n"); 936 goto error; 937 } 938 i = (int) *((u_short *) cmdbuf); 939 if (i <= bp->b_bcount) { 940 if (i == 0) 941 sc->sc_flags |= MTF_HITEOF; 942 bp->b_resid = bp->b_bcount - i; 943 DPRINTF(MDB_ANY, ("%s intr: bcount %d, resid %d", 944 device_xname(sc->sc_dev), 945 bp->b_bcount, bp->b_resid)); 946 } else { 947 tprintf(sc->sc_ttyp, 948 "%s: record (%d) larger than wanted (%d)\n", 949 device_xname(sc->sc_dev), i, bp->b_bcount); 950 error: 951 sc->sc_flags &= ~MTF_IO; 952 bp->b_error = EIO; 953 } 954 } 955 /* 956 * The operation is completely done. 957 * Let the drive know with an END command. 958 */ 959 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 960 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 961 bp->b_flags &= ~B_CMD; 962 (void)bufq_get(sc->sc_tab); 963 biodone(bp); 964 gpibrelease(sc->sc_ic, sc->sc_hdl); 965 if (bufq_peek(sc->sc_tab) == NULL) 966 sc->sc_active = 0; 967 else 968 mtustart(sc); 969 } 970 971 int 972 mtread(dev_t dev, struct uio *uio, int flags) 973 { 974 return (physio(mtstrategy, NULL, dev, B_READ, minphys, uio)); 975 } 976 977 int 978 mtwrite(dev_t dev, struct uio *uio, int flags) 979 { 980 return (physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio)); 981 } 982 983 int 984 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 985 { 986 struct mtop *op; 987 int cnt; 988 989 switch (cmd) { 990 case MTIOCTOP: 991 op = (struct mtop *)data; 992 switch(op->mt_op) { 993 case MTWEOF: 994 case MTFSF: 995 case MTBSR: 996 case MTBSF: 997 case MTFSR: 998 cnt = op->mt_count; 999 break; 1000 1001 case MTOFFL: 1002 case MTREW: 1003 case MTNOP: 1004 cnt = 0; 1005 break; 1006 1007 default: 1008 return (EINVAL); 1009 } 1010 return (mtcommand(dev, op->mt_op, cnt)); 1011 1012 case MTIOCGET: 1013 break; 1014 1015 default: 1016 return (EINVAL); 1017 } 1018 return (0); 1019 } 1020
Indexes created Wed Oct 01 13:09:50 GMT 2025