1 /* $NetBSD: mt.c,v 1.34 2019/12/01 16:22:10 riastradh 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 1.34 2019/12/01 16:22:10 riastradh 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_dev = self; 234 sc->sc_ic = ca->ca_ic; 235 sc->sc_slave = ca->ca_slave; 236 237 if ((type = mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0) 238 return; 239 240 aprint_naive("\n"); 241 aprint_normal(": %s tape\n", mtinfo[type].desc); 242 243 sc->sc_type = type; 244 sc->sc_flags = MTF_EXISTS; 245 246 bufq_alloc(&sc->sc_tab, "fcfs", 0); 247 callout_init(&sc->sc_start_ch, 0); 248 callout_init(&sc->sc_intr_ch, 0); 249 250 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 251 &sc->sc_hdl)) { 252 aprint_error_dev(sc->sc_dev, "can't register callback\n"); 253 return; 254 } 255 } 256 257 /* 258 * Perform a read of "Device Status Jump" register and update the 259 * status if necessary. If status is read, the given "ecmd" is also 260 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 261 * and -2 on "temporary" failure. 262 */ 263 int 264 mtreaddsj(struct mt_softc *sc, int ecmd) 265 { 266 int retval; 267 268 if (sc->sc_flags & MTF_STATTIMEO) 269 goto getstats; 270 retval = gpibrecv(sc->sc_ic, 271 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 272 MTT_DSJ, &(sc->sc_lastdsj), 1); 273 sc->sc_flags &= ~MTF_DSJTIMEO; 274 if (retval != 1) { 275 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 276 device_xname(sc->sc_dev))); 277 if (sc->sc_recvtimeo == 0) 278 sc->sc_recvtimeo = hz; 279 if (--sc->sc_recvtimeo == 0) 280 return (-1); 281 if (retval == 0) 282 sc->sc_flags |= MTF_DSJTIMEO; 283 return (-2); 284 } 285 sc->sc_recvtimeo = 0; 286 sc->sc_statindex = 0; 287 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", device_xname(sc->sc_dev), 288 sc->sc_lastdsj)); 289 sc->sc_lastecmd = ecmd; 290 switch (sc->sc_lastdsj) { 291 case 0: 292 if (ecmd & MTE_DSJ_FORCE) 293 break; 294 return (0); 295 296 case 2: 297 sc->sc_lastecmd = MTE_COMPLETE; 298 case 1: 299 break; 300 301 default: 302 printf("%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev), 303 sc->sc_lastdsj); 304 return (-1); 305 } 306 307 getstats: 308 retval = gpibrecv(sc->sc_ic, 309 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 310 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 311 sizeof(sc->sc_stat) - sc->sc_statindex); 312 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 313 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 314 if (sc->sc_recvtimeo == 0) 315 sc->sc_recvtimeo = hz; 316 if (--sc->sc_recvtimeo != 0) { 317 if (retval >= 0) { 318 sc->sc_statindex += retval; 319 sc->sc_flags |= MTF_STATCONT; 320 } 321 sc->sc_flags |= MTF_STATTIMEO; 322 return (-2); 323 } 324 printf("%s readdsj: can't read status", 325 device_xname(sc->sc_dev)); 326 return (-1); 327 } 328 sc->sc_recvtimeo = 0; 329 sc->sc_statindex = 0; 330 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x", 331 device_xname(sc->sc_dev), 332 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 333 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6)); 334 if (sc->sc_lastecmd) 335 (void) gpibsend(sc->sc_ic, sc->sc_slave, 336 MTL_ECMD, &(sc->sc_lastecmd), 1); 337 return ((int) sc->sc_lastdsj); 338 } 339 340 int 341 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 342 { 343 struct mt_softc *sc; 344 int req_den; 345 int error; 346 347 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 348 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 349 return (ENXIO); 350 351 if (sc->sc_flags & MTF_OPEN) 352 return (EBUSY); 353 354 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(sc->sc_dev), 355 sc->sc_flags)); 356 357 sc->sc_flags |= MTF_OPEN; 358 sc->sc_ttyp = tprintf_open(l->l_proc); 359 if ((sc->sc_flags & MTF_ALIVE) == 0) { 360 error = mtcommand(dev, MTRESET, 0); 361 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 362 goto errout; 363 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 364 (void) mtcommand(dev, MTREW, 0); 365 } 366 for (;;) { 367 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 368 goto errout; 369 if (!(sc->sc_flags & MTF_REW)) 370 break; 371 error = kpause("mt", true, hz, NULL); 372 if (error != 0 && error != EWOULDBLOCK) { 373 error = EINTR; 374 goto errout; 375 } 376 } 377 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 378 error = EROFS; 379 goto errout; 380 } 381 if (!(sc->sc_stat1 & SR1_ONLINE)) { 382 uprintf("%s: not online\n", device_xname(sc->sc_dev)); 383 error = EIO; 384 goto errout; 385 } 386 /* 387 * Select density: 388 * - find out what density the drive is set to 389 * (i.e. the density of the current tape) 390 * - if we are going to write 391 * - if we're not at the beginning of the tape 392 * - complain if we want to change densities 393 * - otherwise, select the mtcommand to set the density 394 * 395 * If the drive doesn't support it then don't change the recorded 396 * density. 397 * 398 * The original MOREbsd code had these additional conditions 399 * for the mid-tape change 400 * 401 * req_den != T_BADBPI && 402 * sc->sc_density != T_6250BPI 403 * 404 * which suggests that it would be possible to write multiple 405 * densities if req_den == T_BAD_BPI or the current tape 406 * density was 6250. Testing of our 7980 suggests that the 407 * device cannot change densities mid-tape. 408 * 409 * ajv (at) comp.vuw.ac.nz 410 */ 411 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 412 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 413 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 414 req_den = (dev & T_DENSEL); 415 416 if (flag & FWRITE) { 417 if (!(sc->sc_stat1 & SR1_BOT)) { 418 if (sc->sc_density != req_den) { 419 uprintf("%s: can't change density mid-tape\n", 420 device_xname(sc->sc_dev)); 421 error = EIO; 422 goto errout; 423 } 424 } 425 else { 426 int mtset_density = 427 (req_den == T_800BPI ? MTSET800BPI : ( 428 req_den == T_1600BPI ? MTSET1600BPI : ( 429 req_den == T_6250BPI ? MTSET6250BPI : ( 430 sc->sc_type == MT7980ID 431 ? MTSET6250DC 432 : MTSET6250BPI)))); 433 if (mtcommand(dev, mtset_density, 0) == 0) 434 sc->sc_density = req_den; 435 } 436 } 437 return (0); 438 errout: 439 sc->sc_flags &= ~MTF_OPEN; 440 return (error); 441 } 442 443 int 444 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 445 { 446 struct mt_softc *sc; 447 448 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 449 if (sc == NULL) 450 return (ENXIO); 451 452 if (sc->sc_flags & MTF_WRT) { 453 (void) mtcommand(dev, MTWEOF, 2); 454 (void) mtcommand(dev, MTBSF, 0); 455 } 456 if ((minor(dev) & T_NOREWIND) == 0) 457 (void) mtcommand(dev, MTREW, 0); 458 sc->sc_flags &= ~MTF_OPEN; 459 tprintf_close(sc->sc_ttyp); 460 return (0); 461 } 462 463 int 464 mtcommand(dev_t dev, int cmd, int cnt) 465 { 466 struct mt_softc *sc; 467 struct buf *bp; 468 int error = 0; 469 470 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 471 bp = &sc->sc_bufstore; 472 473 if (bp->b_cflags & BC_BUSY) 474 return (EBUSY); 475 476 bp->b_cmd = cmd; 477 bp->b_dev = dev; 478 bp->b_objlock = &buffer_lock; 479 do { 480 bp->b_cflags = BC_BUSY; 481 bp->b_flags = B_CMD; 482 bp->b_oflags = 0; 483 mtstrategy(bp); 484 biowait(bp); 485 if (bp->b_error != 0) { 486 error = (int) (unsigned) bp->b_error; 487 break; 488 } 489 } while (--cnt > 0); 490 #if 0 491 bp->b_cflags = 0 /*&= ~BC_BUSY*/; 492 #else 493 bp->b_cflags &= ~BC_BUSY; 494 #endif 495 return (error); 496 } 497 498 /* 499 * Only thing to check here is for legal record lengths (writes only). 500 */ 501 void 502 mtstrategy(struct buf *bp) 503 { 504 struct mt_softc *sc; 505 int s; 506 507 sc = device_lookup_private(&mt_cd, MTUNIT(bp->b_dev)); 508 509 DPRINTF(MDB_ANY, ("%s strategy", device_xname(sc->sc_dev))); 510 511 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 512 #define WRITE_BITS_IGNORED 8 513 #if 0 514 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 515 tprintf(sc->sc_ttyp, 516 "%s: write record must be multiple of %d\n", 517 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED); 518 goto error; 519 } 520 #endif 521 s = 16 * 1024; 522 if (sc->sc_stat2 & SR2_LONGREC) { 523 switch (sc->sc_density) { 524 case T_1600BPI: 525 s = 32 * 1024; 526 break; 527 528 case T_6250BPI: 529 case T_BADBPI: 530 s = 60 * 1024; 531 break; 532 } 533 } 534 if (bp->b_bcount > s) { 535 tprintf(sc->sc_ttyp, 536 "%s: write record (%d) too big: limit (%d)\n", 537 device_xname(sc->sc_dev), bp->b_bcount, s); 538 #if 0 /* XXX see above */ 539 error: 540 #endif 541 bp->b_error = EIO; 542 biodone(bp); 543 return; 544 } 545 } 546 s = splbio(); 547 bufq_put(sc->sc_tab, bp); 548 if (sc->sc_active == 0) { 549 sc->sc_active = 1; 550 mtustart(sc); 551 } 552 splx(s); 553 } 554 555 void 556 mtustart(struct mt_softc *sc) 557 { 558 559 DPRINTF(MDB_ANY, ("%s ustart", device_xname(sc->sc_dev))); 560 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 561 mtstart(sc); 562 } 563 564 void 565 mtcallback(void *v, int action) 566 { 567 struct mt_softc *sc = v; 568 569 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 570 571 switch (action) { 572 case GPIBCBF_START: 573 mtstart(sc); 574 break; 575 case GPIBCBF_INTR: 576 mtintr(sc); 577 break; 578 #ifdef DEBUG 579 default: 580 printf("mtcallback: unknown action %d\n", action); 581 break; 582 #endif 583 } 584 } 585 586 void 587 mtintr_callout(void *arg) 588 { 589 struct mt_softc *sc = arg; 590 int s = splbio(); 591 592 gpibppclear(sc->sc_ic); 593 mtintr(sc); 594 splx(s); 595 } 596 597 void 598 mtstart_callout(void *arg) 599 { 600 int s = splbio(); 601 602 mtstart((struct mt_softc *)arg); 603 splx(s); 604 } 605 606 void 607 mtstart(struct mt_softc *sc) 608 { 609 struct buf *bp; 610 short cmdcount = 1; 611 u_char cmdbuf[2]; 612 613 DPRINTF(MDB_ANY, ("%s start", device_xname(sc->sc_dev))); 614 sc->sc_flags &= ~MTF_WRT; 615 bp = bufq_peek(sc->sc_tab); 616 if ((sc->sc_flags & MTF_ALIVE) == 0 && 617 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 618 goto fatalerror; 619 620 if (sc->sc_flags & MTF_REW) { 621 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 622 goto stillrew; 623 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 624 case 0: 625 case 1: 626 stillrew: 627 if ((sc->sc_stat1 & SR1_BOT) || 628 !(sc->sc_stat1 & SR1_ONLINE)) { 629 sc->sc_flags &= ~MTF_REW; 630 break; 631 } 632 /* FALLTHROUGH */ 633 case -2: 634 /* 635 * -2 means "timeout" reading DSJ, which is probably 636 * temporary. This is considered OK when doing a NOP, 637 * but not otherwise. 638 */ 639 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 640 callout_reset(&sc->sc_start_ch, hz >> 5, 641 mtstart_callout, sc); 642 return; 643 } 644 /* FALLTHROUGH */ 645 case 2: 646 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 647 bp->b_error = EBUSY; 648 goto done; 649 } 650 goto done; 651 652 default: 653 goto fatalerror; 654 } 655 } 656 if (bp->b_flags & B_CMD) { 657 if (sc->sc_flags & MTF_PASTEOT) { 658 switch(bp->b_cmd) { 659 case MTFSF: 660 case MTWEOF: 661 case MTFSR: 662 bp->b_error = ENOSPC; 663 goto done; 664 665 case MTBSF: 666 case MTOFFL: 667 case MTBSR: 668 case MTREW: 669 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 670 break; 671 } 672 } 673 switch(bp->b_cmd) { 674 case MTFSF: 675 if (sc->sc_flags & MTF_HITEOF) 676 goto done; 677 cmdbuf[0] = MTTC_FSF; 678 break; 679 680 case MTBSF: 681 if (sc->sc_flags & MTF_HITBOF) 682 goto done; 683 cmdbuf[0] = MTTC_BSF; 684 break; 685 686 case MTOFFL: 687 sc->sc_flags |= MTF_REW; 688 cmdbuf[0] = MTTC_REWOFF; 689 break; 690 691 case MTWEOF: 692 cmdbuf[0] = MTTC_WFM; 693 break; 694 695 case MTBSR: 696 cmdbuf[0] = MTTC_BSR; 697 break; 698 699 case MTFSR: 700 cmdbuf[0] = MTTC_FSR; 701 break; 702 703 case MTREW: 704 sc->sc_flags |= MTF_REW; 705 cmdbuf[0] = MTTC_REW; 706 break; 707 708 case MTNOP: 709 /* 710 * NOP is supposed to set status bits. 711 * Force readdsj to do it. 712 */ 713 switch (mtreaddsj(sc, 714 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 715 default: 716 goto done; 717 718 case -1: 719 /* 720 * If this fails, perform a device clear 721 * to fix any protocol problems and (most 722 * likely) get the status. 723 */ 724 bp->b_cmd = MTRESET; 725 break; 726 727 case -2: 728 callout_reset(&sc->sc_start_ch, hz >> 5, 729 mtstart_callout, sc); 730 return; 731 } 732 __unreachable(); 733 734 case MTRESET: 735 /* 736 * 1) selected device clear (send with "-2" secondary) 737 * 2) set timeout, then wait for "service request" 738 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 739 */ 740 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 741 aprint_error_dev(sc->sc_dev, "can't reset"); 742 goto fatalerror; 743 } 744 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 745 sc); 746 gpibawait(sc->sc_ic); 747 return; 748 749 case MTSET800BPI: 750 cmdbuf[0] = MTTC_800; 751 break; 752 753 case MTSET1600BPI: 754 cmdbuf[0] = MTTC_1600; 755 break; 756 757 case MTSET6250BPI: 758 cmdbuf[0] = MTTC_6250; 759 break; 760 761 case MTSET6250DC: 762 cmdbuf[0] = MTTC_DC6250; 763 break; 764 } 765 } else { 766 if (sc->sc_flags & MTF_PASTEOT) { 767 bp->b_error = ENOSPC; 768 goto done; 769 } 770 if (bp->b_flags & B_READ) { 771 sc->sc_flags |= MTF_IO; 772 cmdbuf[0] = MTTC_READ; 773 } else { 774 sc->sc_flags |= MTF_WRT | MTF_IO; 775 cmdbuf[0] = MTTC_WRITE; 776 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 777 cmdcount = 2; 778 } 779 } 780 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 781 == cmdcount) { 782 if (sc->sc_flags & MTF_REW) 783 goto done; 784 gpibawait(sc->sc_ic); 785 return; 786 } 787 fatalerror: 788 /* 789 * If anything fails, the drive is probably hosed, so mark it not 790 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 791 * if, last we heard, it was REWinding, remember that). 792 */ 793 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 794 bp->b_error = EIO; 795 done: 796 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 797 (void)bufq_get(sc->sc_tab); 798 biodone(bp); 799 gpibrelease(sc->sc_ic, sc->sc_hdl); 800 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 801 sc->sc_active = 0; 802 else 803 mtustart(sc); 804 } 805 806 void 807 mtintr(struct mt_softc *sc) 808 { 809 struct buf *bp; 810 int slave, dir, i; 811 u_char cmdbuf[4]; 812 813 slave = sc->sc_slave; 814 815 bp = bufq_peek(sc->sc_tab); 816 if (bp == NULL) { 817 printf("%s intr: bp == NULL", device_xname(sc->sc_dev)); 818 return; 819 } 820 821 DPRINTF(MDB_ANY, ("%s intr", device_xname(sc->sc_dev))); 822 823 /* 824 * Some operation completed. Read status bytes and report errors. 825 * Clear EOF flags here `cause they're set once on specific conditions 826 * below when a command succeeds. 827 * A DSJ of 2 always means keep waiting. If the command was READ 828 * (and we're in data DMA phase) stop data transfer first. 829 */ 830 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 831 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 832 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 833 cmdbuf[0] = MTE_STOP; 834 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 835 } 836 switch (mtreaddsj(sc, 0)) { 837 case 0: 838 break; 839 840 case 1: 841 /* 842 * If we're in the middle of a READ/WRITE and have yet to 843 * start the data transfer, a DSJ of one should terminate it. 844 */ 845 sc->sc_flags &= ~MTF_IO; 846 break; 847 848 case 2: 849 (void) gpibawait(sc->sc_ic); 850 return; 851 852 case -2: 853 /* 854 * -2 means that the drive failed to respond quickly enough 855 * to the request for DSJ. It's probably just "busy" figuring 856 * it out and will know in a little bit... 857 */ 858 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 859 return; 860 861 default: 862 printf("%s intr: can't get drive stat", 863 device_xname(sc->sc_dev)); 864 goto error; 865 } 866 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 867 i = sc->sc_stat4 & SR4_ERCLMASK; 868 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 869 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" : 870 (i == SR4_PROTOCOL ? "protocol" : 871 (i == SR4_SELFTEST ? "selftest" : "unknown")), 872 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 873 sc->sc_stat3, sc->sc_stat5); 874 875 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 876 callout_stop(&sc->sc_intr_ch); 877 if (sc->sc_stat3 & SR3_POWERUP) 878 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 879 goto error; 880 } 881 /* 882 * Report and clear any soft errors. 883 */ 884 if (sc->sc_stat1 & SR1_SOFTERR) { 885 printf("%s: soft error, retry %d\n", device_xname(sc->sc_dev), 886 sc->sc_stat4 & SR4_RETRYMASK); 887 sc->sc_stat1 &= ~SR1_SOFTERR; 888 } 889 /* 890 * We've initiated a read or write, but haven't actually started to 891 * DMA the data yet. At this point, the drive's ready. 892 */ 893 if (sc->sc_flags & MTF_IO) { 894 sc->sc_flags &= ~MTF_IO; 895 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 896 gpibxfer(sc->sc_ic, slave, 897 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 898 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 899 return; 900 } 901 /* 902 * Check for End Of Tape - we're allowed to hit EOT and then write (or 903 * read) one more record. If we get here and have not already hit EOT, 904 * return ENOSPC to inform the process that it's hit it. If we get 905 * here and HAVE already hit EOT, don't allow any more operations that 906 * move the tape forward. 907 */ 908 if (sc->sc_stat1 & SR1_EOT) { 909 if (sc->sc_flags & MTF_ATEOT) 910 sc->sc_flags |= MTF_PASTEOT; 911 else { 912 bp->b_error = ENOSPC; 913 sc->sc_flags |= MTF_ATEOT; 914 } 915 } 916 /* 917 * If a motion command was being executed, check for Tape Marks. 918 * If we were doing data, make sure we got the right amount, and 919 * check for hitting tape marks on reads. 920 */ 921 if (bp->b_flags & B_CMD) { 922 if (sc->sc_stat1 & SR1_EOF) { 923 if (bp->b_cmd == MTFSR) 924 sc->sc_flags |= MTF_HITEOF; 925 if (bp->b_cmd == MTBSR) 926 sc->sc_flags |= MTF_HITBOF; 927 } 928 if (bp->b_cmd == MTRESET) { 929 callout_stop(&sc->sc_intr_ch); 930 sc->sc_flags |= MTF_ALIVE; 931 } 932 } else { 933 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 934 if (i != 2) { 935 aprint_error_dev(sc->sc_dev, 936 "intr: can't get xfer length\n"); 937 goto error; 938 } 939 i = (int) *((u_short *) cmdbuf); 940 if (i <= bp->b_bcount) { 941 if (i == 0) 942 sc->sc_flags |= MTF_HITEOF; 943 bp->b_resid = bp->b_bcount - i; 944 DPRINTF(MDB_ANY, ("%s intr: bcount %d, resid %d", 945 device_xname(sc->sc_dev), 946 bp->b_bcount, bp->b_resid)); 947 } else { 948 tprintf(sc->sc_ttyp, 949 "%s: record (%d) larger than wanted (%d)\n", 950 device_xname(sc->sc_dev), i, bp->b_bcount); 951 error: 952 sc->sc_flags &= ~MTF_IO; 953 bp->b_error = EIO; 954 } 955 } 956 /* 957 * The operation is completely done. 958 * Let the drive know with an END command. 959 */ 960 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 961 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 962 bp->b_flags &= ~B_CMD; 963 (void)bufq_get(sc->sc_tab); 964 biodone(bp); 965 gpibrelease(sc->sc_ic, sc->sc_hdl); 966 if (bufq_peek(sc->sc_tab) == NULL) 967 sc->sc_active = 0; 968 else 969 mtustart(sc); 970 } 971 972 int 973 mtread(dev_t dev, struct uio *uio, int flags) 974 { 975 return (physio(mtstrategy, NULL, dev, B_READ, minphys, uio)); 976 } 977 978 int 979 mtwrite(dev_t dev, struct uio *uio, int flags) 980 { 981 return (physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio)); 982 } 983 984 int 985 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 986 { 987 struct mtop *op; 988 int cnt; 989 990 switch (cmd) { 991 case MTIOCTOP: 992 op = (struct mtop *)data; 993 switch(op->mt_op) { 994 case MTWEOF: 995 case MTFSF: 996 case MTBSR: 997 case MTBSF: 998 case MTFSR: 999 cnt = op->mt_count; 1000 break; 1001 1002 case MTOFFL: 1003 case MTREW: 1004 case MTNOP: 1005 cnt = 0; 1006 break; 1007 1008 default: 1009 return (EINVAL); 1010 } 1011 return (mtcommand(dev, op->mt_op, cnt)); 1012 1013 case MTIOCGET: 1014 break; 1015 1016 default: 1017 return (EINVAL); 1018 } 1019 return (0); 1020 } 1021
Indexes created Wed Sep 24 05:09:52 GMT 2025