mt.c revision 1.1
1 /* $NetBSD: mt.c,v 1.1 2003/06/02 03:52:24 gmcgarry 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 * 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) 1988 University of Utah. 41 * Copyright (c) 1982, 1990, 1993 42 * The Regents of the University of California. All rights reserved. 43 * 44 * This code is derived from software contributed to Berkeley by 45 * the Systems Programming Group of the University of Utah Computer 46 * Science Department. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice, this list of conditions and the following disclaimer. 53 * 2. Redistributions in binary form must reproduce the above copyright 54 * notice, this list of conditions and the following disclaimer in the 55 * documentation and/or other materials provided with the distribution. 56 * 3. All advertising materials mentioning features or use of this software 57 * must display the following acknowledgement: 58 * This product includes software developed by the University of 59 * California, Berkeley and its contributors. 60 * 4. Neither the name of the University nor the names of its contributors 61 * may be used to endorse or promote products derived from this software 62 * without specific prior written permission. 63 * 64 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 65 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 66 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 67 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 68 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 69 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 70 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 71 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 72 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 73 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 74 * SUCH DAMAGE. 75 * 76 * from: Utah $Hdr: rd.c 1.44 92/12/26$ 77 * 78 * @(#)rd.c 8.2 (Berkeley) 5/19/94 79 */ 80 81 /* 82 * Magnetic tape driver (HP7974a, HP7978a/b, HP7979a, HP7980a, HP7980xc) 83 * Original version contributed by Mt. Xinu. 84 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 85 * Computer Science, Victoria University of Wellington 86 */ 87 88 #include <sys/cdefs.h> 89 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.1 2003/06/02 03:52:24 gmcgarry Exp $"); 90 91 #include <sys/param.h> 92 #include <sys/systm.h> 93 #include <sys/callout.h> 94 #include <sys/buf.h> 95 #include <sys/ioctl.h> 96 #include <sys/mtio.h> 97 #include <sys/file.h> 98 #include <sys/proc.h> 99 #include <sys/tty.h> 100 #include <sys/kernel.h> 101 #include <sys/tprintf.h> 102 #include <sys/device.h> 103 #include <sys/conf.h> 104 105 #include <dev/gpib/gpibvar.h> 106 #include <dev/gpib/cs80busvar.h> 107 108 #include <dev/gpib/mtreg.h> 109 110 #ifdef DEBUG 111 int mtdebug = 0; 112 #define MDB_ANY 0xff 113 #define MDB_FOLLOW 0x01 114 #define DPRINTF(mask, str) if (mtdebug & (mask)) printf str 115 #else 116 #define DPRINTF(mask, str) /* nothing */ 117 #endif 118 119 struct mt_softc { 120 struct device sc_dev; 121 122 gpib_chipset_tag_t sc_ic; 123 gpib_handle_t sc_hdl; 124 125 int sc_slave; /* GPIB slave address (0-6) */ 126 short sc_flags; /* see below */ 127 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 128 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 129 short sc_recvtimeo; /* count of gpibsend timeouts to prevent hang */ 130 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 131 struct mt_stat sc_stat;/* status bytes last read from device */ 132 short sc_density; /* current density of tape (mtio.h format) */ 133 short sc_type; /* tape drive model (hardware IDs) */ 134 tpr_t sc_ttyp; 135 struct bufq_state sc_tab;/* buf queue */ 136 int sc_active; 137 struct buf sc_bufstore; /* XXX buffer storage */ 138 139 struct callout sc_start_ch; 140 struct callout sc_intr_ch; 141 }; 142 143 #define MTUNIT(x) (minor(x) & 0x03) 144 145 #define B_CMD B_XXX /* command buf instead of data */ 146 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 147 148 int mtmatch(struct device *, struct cfdata *, void *); 149 void mtattach(struct device *, struct device *, void *); 150 151 CFATTACH_DECL(mt, sizeof(struct mt_softc), 152 mtmatch, mtattach, NULL, NULL); 153 154 int mtlookup(int, int, int); 155 void mtustart(struct mt_softc *); 156 int mtreaddsj(struct mt_softc *, int); 157 int mtcommand(dev_t, int, int); 158 159 void mtintr_callout(void *); 160 void mtstart_callout(void *); 161 162 void mtcallback(void *, int); 163 void mtstart(struct mt_softc *); 164 void mtintr(struct mt_softc *); 165 166 dev_type_open(mtopen); 167 dev_type_close(mtclose); 168 dev_type_read(mtread); 169 dev_type_write(mtwrite); 170 dev_type_ioctl(mtioctl); 171 dev_type_strategy(mtstrategy); 172 173 const struct bdevsw mt_bdevsw = { 174 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 175 }; 176 177 const struct cdevsw mt_cdevsw = { 178 mtopen, mtclose, mtread, mtwrite, mtioctl, 179 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 180 }; 181 182 183 extern struct cfdriver mt_cd; 184 185 struct mtinfo { 186 u_short hwid; 187 char *desc; 188 } mtinfo[] = { 189 { MT7978ID, "7978" }, 190 { MT7979AID, "7979A" }, 191 { MT7980ID, "7980" }, 192 { MT7974AID, "7974A" }, 193 }; 194 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 195 196 197 int 198 mtlookup(id, slave, punit) 199 int id; 200 int slave; 201 int punit; 202 { 203 int i; 204 205 for (i = 0; i < nmtinfo; i++) 206 if (mtinfo[i].hwid == id) 207 break; 208 if (i == nmtinfo) 209 return (-1); 210 return (0); 211 } 212 213 int 214 mtmatch(parent, match, aux) 215 struct device *parent; 216 struct cfdata *match; 217 void *aux; 218 { 219 struct cs80bus_attach_args *ca = aux; 220 221 ca->ca_punit = 0; 222 return (mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit) == 0); 223 } 224 225 void 226 mtattach(parent, self, aux) 227 struct device *parent, *self; 228 void *aux; 229 { 230 struct mt_softc *sc = (struct mt_softc *)self; 231 struct cs80bus_attach_args *ca = aux; 232 int type; 233 234 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 printf(": %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, BUFQ_FCFS); 246 callout_init(&sc->sc_start_ch); 247 callout_init(&sc->sc_intr_ch); 248 249 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 250 &sc->sc_hdl)) { 251 printf("%s: can't register callback\n", sc->sc_dev.dv_xname); 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(sc, ecmd) 264 struct mt_softc *sc; 265 int ecmd; 266 { 267 int retval; 268 269 if (sc->sc_flags & MTF_STATTIMEO) 270 goto getstats; 271 retval = gpibrecv(sc->sc_ic, 272 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 273 MTT_DSJ, &(sc->sc_lastdsj), 1); 274 sc->sc_flags &= ~MTF_DSJTIMEO; 275 if (retval != 1) { 276 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 277 sc->sc_dev.dv_xname)); 278 if (sc->sc_recvtimeo == 0) 279 sc->sc_recvtimeo = hz; 280 if (--sc->sc_recvtimeo == 0) 281 return (-1); 282 if (retval == 0) 283 sc->sc_flags |= MTF_DSJTIMEO; 284 return (-2); 285 } 286 sc->sc_recvtimeo = 0; 287 sc->sc_statindex = 0; 288 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", sc->sc_dev.dv_xname, 289 sc->sc_lastdsj)); 290 sc->sc_lastecmd = ecmd; 291 switch (sc->sc_lastdsj) { 292 case 0: 293 if (ecmd & MTE_DSJ_FORCE) 294 break; 295 return (0); 296 297 case 2: 298 sc->sc_lastecmd = MTE_COMPLETE; 299 case 1: 300 break; 301 302 default: 303 printf("%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname, 304 sc->sc_lastdsj); 305 return (-1); 306 } 307 308 getstats: 309 retval = gpibrecv(sc->sc_ic, 310 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 311 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 312 sizeof(sc->sc_stat) - sc->sc_statindex); 313 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 314 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 315 if (sc->sc_recvtimeo == 0) 316 sc->sc_recvtimeo = hz; 317 if (--sc->sc_recvtimeo != 0) { 318 if (retval >= 0) { 319 sc->sc_statindex += retval; 320 sc->sc_flags |= MTF_STATCONT; 321 } 322 sc->sc_flags |= MTF_STATTIMEO; 323 return (-2); 324 } 325 printf("%s readdsj: can't read status", sc->sc_dev.dv_xname); 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 sc->sc_dev.dv_xname, 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, flag, mode, p) 342 dev_t dev; 343 int flag, mode; 344 struct proc *p; 345 { 346 struct mt_softc *sc; 347 int req_den; 348 int error; 349 350 sc = device_lookup(&mt_cd, MTUNIT(dev)); 351 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 352 return (ENXIO); 353 354 if (sc->sc_flags & MTF_OPEN) 355 return (EBUSY); 356 357 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", sc->sc_dev.dv_xname, 358 sc->sc_flags)); 359 360 sc->sc_flags |= MTF_OPEN; 361 sc->sc_ttyp = tprintf_open(p); 362 if ((sc->sc_flags & MTF_ALIVE) == 0) { 363 error = mtcommand(dev, MTRESET, 0); 364 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 365 goto errout; 366 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 367 (void) mtcommand(dev, MTREW, 0); 368 } 369 for (;;) { 370 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 371 goto errout; 372 if (!(sc->sc_flags & MTF_REW)) 373 break; 374 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1), 375 "mt", 0) != 0) { 376 error = EINTR; 377 goto errout; 378 } 379 } 380 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 381 error = EROFS; 382 goto errout; 383 } 384 if (!(sc->sc_stat1 & SR1_ONLINE)) { 385 uprintf("%s: not online\n", sc->sc_dev.dv_xname); 386 error = EIO; 387 goto errout; 388 } 389 /* 390 * Select density: 391 * - find out what density the drive is set to 392 * (i.e. the density of the current tape) 393 * - if we are going to write 394 * - if we're not at the beginning of the tape 395 * - complain if we want to change densities 396 * - otherwise, select the mtcommand to set the density 397 * 398 * If the drive doesn't support it then don't change the recorded 399 * density. 400 * 401 * The original MOREbsd code had these additional conditions 402 * for the mid-tape change 403 * 404 * req_den != T_BADBPI && 405 * sc->sc_density != T_6250BPI 406 * 407 * which suggests that it would be possible to write multiple 408 * densities if req_den == T_BAD_BPI or the current tape 409 * density was 6250. Testing of our 7980 suggests that the 410 * device cannot change densities mid-tape. 411 * 412 * ajv (at) comp.vuw.ac.nz 413 */ 414 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 415 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 416 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 417 req_den = (dev & T_DENSEL); 418 419 if (flag & FWRITE) { 420 if (!(sc->sc_stat1 & SR1_BOT)) { 421 if (sc->sc_density != req_den) { 422 uprintf("%s: can't change density mid-tape\n", 423 sc->sc_dev.dv_xname); 424 error = EIO; 425 goto errout; 426 } 427 } 428 else { 429 int mtset_density = 430 (req_den == T_800BPI ? MTSET800BPI : ( 431 req_den == T_1600BPI ? MTSET1600BPI : ( 432 req_den == T_6250BPI ? MTSET6250BPI : ( 433 sc->sc_type == MT7980ID 434 ? MTSET6250DC 435 : MTSET6250BPI)))); 436 if (mtcommand(dev, mtset_density, 0) == 0) 437 sc->sc_density = req_den; 438 } 439 } 440 return (0); 441 errout: 442 sc->sc_flags &= ~MTF_OPEN; 443 return (error); 444 } 445 446 int 447 mtclose(dev, flag, fmt, p) 448 dev_t dev; 449 int flag, fmt; 450 struct proc *p; 451 { 452 struct mt_softc *sc; 453 454 sc = device_lookup(&mt_cd, MTUNIT(dev)); 455 if (sc == NULL) 456 return (ENXIO); 457 458 if (sc->sc_flags & MTF_WRT) { 459 (void) mtcommand(dev, MTWEOF, 2); 460 (void) mtcommand(dev, MTBSF, 0); 461 } 462 if ((minor(dev) & T_NOREWIND) == 0) 463 (void) mtcommand(dev, MTREW, 0); 464 sc->sc_flags &= ~MTF_OPEN; 465 tprintf_close(sc->sc_ttyp); 466 return (0); 467 } 468 469 int 470 mtcommand(dev, cmd, cnt) 471 dev_t dev; 472 int cmd; 473 int cnt; 474 { 475 struct mt_softc *sc; 476 struct buf *bp; 477 int error = 0; 478 479 sc = device_lookup(&mt_cd, MTUNIT(dev)); 480 bp = &sc->sc_bufstore; 481 482 if (bp->b_flags & B_BUSY) 483 return (EBUSY); 484 485 bp->b_cmd = cmd; 486 bp->b_dev = dev; 487 do { 488 bp->b_flags = B_BUSY | B_CMD; 489 mtstrategy(bp); 490 biowait(bp); 491 if (bp->b_flags & B_ERROR) { 492 error = (int) (unsigned) bp->b_error; 493 break; 494 } 495 } while (--cnt > 0); 496 #if 0 497 bp->b_flags = 0 /*&= ~B_BUSY*/; 498 #else 499 bp->b_flags &= ~B_BUSY; 500 #endif 501 return (error); 502 } 503 504 /* 505 * Only thing to check here is for legal record lengths (writes only). 506 */ 507 void 508 mtstrategy(bp) 509 struct buf *bp; 510 { 511 struct mt_softc *sc; 512 int s; 513 514 sc = device_lookup(&mt_cd, MTUNIT(bp->b_dev)); 515 516 DPRINTF(MDB_ANY, ("%s strategy", sc->sc_dev.dv_xname)); 517 518 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 519 #define WRITE_BITS_IGNORED 8 520 #if 0 521 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 522 tprintf(sc->sc_ttyp, 523 "%s: write record must be multiple of %d\n", 524 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED); 525 goto error; 526 } 527 #endif 528 s = 16 * 1024; 529 if (sc->sc_stat2 & SR2_LONGREC) { 530 switch (sc->sc_density) { 531 case T_1600BPI: 532 s = 32 * 1024; 533 break; 534 535 case T_6250BPI: 536 case T_BADBPI: 537 s = 60 * 1024; 538 break; 539 } 540 } 541 if (bp->b_bcount > s) { 542 tprintf(sc->sc_ttyp, 543 "%s: write record (%ld) too big: limit (%d)\n", 544 sc->sc_dev.dv_xname, bp->b_bcount, s); 545 #if 0 /* XXX see above */ 546 error: 547 #endif 548 bp->b_flags |= B_ERROR; 549 bp->b_error = EIO; 550 biodone(bp); 551 return; 552 } 553 } 554 s = splbio(); 555 BUFQ_PUT(&sc->sc_tab, bp); 556 if (sc->sc_active == 0) { 557 sc->sc_active = 1; 558 mtustart(sc); 559 } 560 splx(s); 561 } 562 563 void 564 mtustart(sc) 565 struct mt_softc *sc; 566 { 567 568 DPRINTF(MDB_ANY, ("%s ustart", sc->sc_dev.dv_xname)); 569 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 570 mtstart(sc); 571 } 572 573 void 574 mtcallback(v, action) 575 void *v; 576 int action; 577 { 578 struct mt_softc *sc = v; 579 580 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 581 582 switch (action) { 583 case GPIBCBF_START: 584 mtstart(sc); 585 break; 586 case GPIBCBF_INTR: 587 mtintr(sc); 588 break; 589 #ifdef DEBUG 590 default: 591 printf("mtcallback: unknown action %d\n", action); 592 break; 593 #endif 594 } 595 } 596 597 void 598 mtintr_callout(arg) 599 void *arg; 600 { 601 struct mt_softc *sc = arg; 602 int s = splbio(); 603 604 gpibppclear(sc->sc_ic); 605 mtintr(sc); 606 splx(s); 607 } 608 609 void 610 mtstart_callout(arg) 611 void *arg; 612 { 613 int s = splbio(); 614 615 mtstart((struct mt_softc *)arg); 616 splx(s); 617 } 618 619 void 620 mtstart(sc) 621 struct mt_softc *sc; 622 { 623 struct buf *bp; 624 short cmdcount = 1; 625 u_char cmdbuf[2]; 626 627 DPRINTF(MDB_ANY, ("%s start", sc->sc_dev.dv_xname)); 628 sc->sc_flags &= ~MTF_WRT; 629 bp = BUFQ_PEEK(&sc->sc_tab); 630 if ((sc->sc_flags & MTF_ALIVE) == 0 && 631 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 632 goto fatalerror; 633 634 if (sc->sc_flags & MTF_REW) { 635 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 636 goto stillrew; 637 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 638 case 0: 639 case 1: 640 stillrew: 641 if ((sc->sc_stat1 & SR1_BOT) || 642 !(sc->sc_stat1 & SR1_ONLINE)) { 643 sc->sc_flags &= ~MTF_REW; 644 break; 645 } 646 case -2: 647 /* 648 * -2 means "timeout" reading DSJ, which is probably 649 * temporary. This is considered OK when doing a NOP, 650 * but not otherwise. 651 */ 652 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 653 callout_reset(&sc->sc_start_ch, hz >> 5, 654 mtstart_callout, sc); 655 return; 656 } 657 case 2: 658 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 659 bp->b_error = EBUSY; 660 goto errdone; 661 } 662 goto done; 663 664 default: 665 goto fatalerror; 666 } 667 } 668 if (bp->b_flags & B_CMD) { 669 if (sc->sc_flags & MTF_PASTEOT) { 670 switch(bp->b_cmd) { 671 case MTFSF: 672 case MTWEOF: 673 case MTFSR: 674 bp->b_error = ENOSPC; 675 goto errdone; 676 677 case MTBSF: 678 case MTOFFL: 679 case MTBSR: 680 case MTREW: 681 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 682 break; 683 } 684 } 685 switch(bp->b_cmd) { 686 case MTFSF: 687 if (sc->sc_flags & MTF_HITEOF) 688 goto done; 689 cmdbuf[0] = MTTC_FSF; 690 break; 691 692 case MTBSF: 693 if (sc->sc_flags & MTF_HITBOF) 694 goto done; 695 cmdbuf[0] = MTTC_BSF; 696 break; 697 698 case MTOFFL: 699 sc->sc_flags |= MTF_REW; 700 cmdbuf[0] = MTTC_REWOFF; 701 break; 702 703 case MTWEOF: 704 cmdbuf[0] = MTTC_WFM; 705 break; 706 707 case MTBSR: 708 cmdbuf[0] = MTTC_BSR; 709 break; 710 711 case MTFSR: 712 cmdbuf[0] = MTTC_FSR; 713 break; 714 715 case MTREW: 716 sc->sc_flags |= MTF_REW; 717 cmdbuf[0] = MTTC_REW; 718 break; 719 720 case MTNOP: 721 /* 722 * NOP is supposed to set status bits. 723 * Force readdsj to do it. 724 */ 725 switch (mtreaddsj(sc, 726 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 727 default: 728 goto done; 729 730 case -1: 731 /* 732 * If this fails, perform a device clear 733 * to fix any protocol problems and (most 734 * likely) get the status. 735 */ 736 bp->b_cmd = MTRESET; 737 break; 738 739 case -2: 740 callout_reset(&sc->sc_start_ch, hz >> 5, 741 mtstart_callout, sc); 742 return; 743 } 744 745 case MTRESET: 746 /* 747 * 1) selected device clear (send with "-2" secondary) 748 * 2) set timeout, then wait for "service request" 749 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 750 */ 751 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 752 printf("%s can't reset", sc->sc_dev.dv_xname); 753 goto fatalerror; 754 } 755 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 756 sc); 757 gpibawait(sc->sc_ic); 758 return; 759 760 case MTSET800BPI: 761 cmdbuf[0] = MTTC_800; 762 break; 763 764 case MTSET1600BPI: 765 cmdbuf[0] = MTTC_1600; 766 break; 767 768 case MTSET6250BPI: 769 cmdbuf[0] = MTTC_6250; 770 break; 771 772 case MTSET6250DC: 773 cmdbuf[0] = MTTC_DC6250; 774 break; 775 } 776 } else { 777 if (sc->sc_flags & MTF_PASTEOT) { 778 bp->b_error = ENOSPC; 779 goto errdone; 780 } 781 if (bp->b_flags & B_READ) { 782 sc->sc_flags |= MTF_IO; 783 cmdbuf[0] = MTTC_READ; 784 } else { 785 sc->sc_flags |= MTF_WRT | MTF_IO; 786 cmdbuf[0] = MTTC_WRITE; 787 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 788 cmdcount = 2; 789 } 790 } 791 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 792 == cmdcount) { 793 if (sc->sc_flags & MTF_REW) 794 goto done; 795 gpibawait(sc->sc_ic); 796 return; 797 } 798 fatalerror: 799 /* 800 * If anything fails, the drive is probably hosed, so mark it not 801 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 802 * if, last we heard, it was REWinding, remember that). 803 */ 804 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 805 bp->b_error = EIO; 806 errdone: 807 bp->b_flags |= B_ERROR; 808 done: 809 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 810 (void)BUFQ_GET(&sc->sc_tab); 811 biodone(bp); 812 gpibrelease(sc->sc_ic, sc->sc_hdl); 813 if ((bp = BUFQ_PEEK(&sc->sc_tab)) == NULL) 814 sc->sc_active = 0; 815 else 816 mtustart(sc); 817 } 818 819 void 820 mtintr(sc) 821 struct mt_softc *sc; 822 { 823 struct buf *bp; 824 int slave, dir, i; 825 u_char cmdbuf[4]; 826 827 slave = sc->sc_slave; 828 829 bp = BUFQ_PEEK(&sc->sc_tab); 830 if (bp == NULL) { 831 printf("%s intr: bp == NULL", sc->sc_dev.dv_xname); 832 return; 833 } 834 835 DPRINTF(MDB_ANY, ("%s intr", sc->sc_dev.dv_xname)); 836 837 /* 838 * Some operation completed. Read status bytes and report errors. 839 * Clear EOF flags here `cause they're set once on specific conditions 840 * below when a command succeeds. 841 * A DSJ of 2 always means keep waiting. If the command was READ 842 * (and we're in data DMA phase) stop data transfer first. 843 */ 844 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 845 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 846 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 847 cmdbuf[0] = MTE_STOP; 848 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 849 } 850 switch (mtreaddsj(sc, 0)) { 851 case 0: 852 break; 853 854 case 1: 855 /* 856 * If we're in the middle of a READ/WRITE and have yet to 857 * start the data transfer, a DSJ of one should terminate it. 858 */ 859 sc->sc_flags &= ~MTF_IO; 860 break; 861 862 case 2: 863 (void) gpibawait(sc->sc_ic); 864 return; 865 866 case -2: 867 /* 868 * -2 means that the drive failed to respond quickly enough 869 * to the request for DSJ. It's probably just "busy" figuring 870 * it out and will know in a little bit... 871 */ 872 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 873 return; 874 875 default: 876 printf("%s intr: can't get drive stat", sc->sc_dev.dv_xname); 877 goto error; 878 } 879 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 880 i = sc->sc_stat4 & SR4_ERCLMASK; 881 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 882 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" : 883 (i == SR4_PROTOCOL ? "protocol" : 884 (i == SR4_SELFTEST ? "selftest" : "unknown")), 885 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 886 sc->sc_stat3, sc->sc_stat5); 887 888 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 889 callout_stop(&sc->sc_intr_ch); 890 if (sc->sc_stat3 & SR3_POWERUP) 891 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 892 goto error; 893 } 894 /* 895 * Report and clear any soft errors. 896 */ 897 if (sc->sc_stat1 & SR1_SOFTERR) { 898 printf("%s: soft error, retry %d\n", sc->sc_dev.dv_xname, 899 sc->sc_stat4 & SR4_RETRYMASK); 900 sc->sc_stat1 &= ~SR1_SOFTERR; 901 } 902 /* 903 * We've initiated a read or write, but haven't actually started to 904 * DMA the data yet. At this point, the drive's ready. 905 */ 906 if (sc->sc_flags & MTF_IO) { 907 sc->sc_flags &= ~MTF_IO; 908 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 909 gpibxfer(sc->sc_ic, slave, 910 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 911 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 912 return; 913 } 914 /* 915 * Check for End Of Tape - we're allowed to hit EOT and then write (or 916 * read) one more record. If we get here and have not already hit EOT, 917 * return ENOSPC to inform the process that it's hit it. If we get 918 * here and HAVE already hit EOT, don't allow any more operations that 919 * move the tape forward. 920 */ 921 if (sc->sc_stat1 & SR1_EOT) { 922 if (sc->sc_flags & MTF_ATEOT) 923 sc->sc_flags |= MTF_PASTEOT; 924 else { 925 bp->b_flags |= B_ERROR; 926 bp->b_error = ENOSPC; 927 sc->sc_flags |= MTF_ATEOT; 928 } 929 } 930 /* 931 * If a motion command was being executed, check for Tape Marks. 932 * If we were doing data, make sure we got the right amount, and 933 * check for hitting tape marks on reads. 934 */ 935 if (bp->b_flags & B_CMD) { 936 if (sc->sc_stat1 & SR1_EOF) { 937 if (bp->b_cmd == MTFSR) 938 sc->sc_flags |= MTF_HITEOF; 939 if (bp->b_cmd == MTBSR) 940 sc->sc_flags |= MTF_HITBOF; 941 } 942 if (bp->b_cmd == MTRESET) { 943 callout_stop(&sc->sc_intr_ch); 944 sc->sc_flags |= MTF_ALIVE; 945 } 946 } else { 947 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 948 if (i != 2) { 949 printf("%s intr: can't get xfer length\n", 950 sc->sc_dev.dv_xname); 951 goto error; 952 } 953 i = (int) *((u_short *) cmdbuf); 954 if (i <= bp->b_bcount) { 955 if (i == 0) 956 sc->sc_flags |= MTF_HITEOF; 957 bp->b_resid = bp->b_bcount - i; 958 DPRINTF(MDB_ANY, ("%s intr: bcount %ld, resid %ld", 959 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid)); 960 } else { 961 tprintf(sc->sc_ttyp, 962 "%s: record (%d) larger than wanted (%ld)\n", 963 sc->sc_dev.dv_xname, i, bp->b_bcount); 964 error: 965 sc->sc_flags &= ~MTF_IO; 966 bp->b_error = EIO; 967 bp->b_flags |= B_ERROR; 968 } 969 } 970 /* 971 * The operation is completely done. 972 * Let the drive know with an END command. 973 */ 974 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 975 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 976 bp->b_flags &= ~B_CMD; 977 (void)BUFQ_GET(&sc->sc_tab); 978 biodone(bp); 979 gpibrelease(sc->sc_ic, sc->sc_hdl); 980 if (BUFQ_PEEK(&sc->sc_tab) == NULL) 981 sc->sc_active = 0; 982 else 983 mtustart(sc); 984 } 985 986 int 987 mtread(dev, uio, flags) 988 dev_t dev; 989 struct uio *uio; 990 int flags; 991 { 992 struct mt_softc *sc; 993 994 sc = device_lookup(&mt_cd, MTUNIT(dev)); 995 996 return (physio(mtstrategy, &sc->sc_bufstore, 997 dev, B_READ, minphys, uio)); 998 } 999 1000 int 1001 mtwrite(dev, uio, flags) 1002 dev_t dev; 1003 struct uio *uio; 1004 int flags; 1005 { 1006 struct mt_softc *sc; 1007 1008 sc = device_lookup(&mt_cd, MTUNIT(dev)); 1009 1010 return (physio(mtstrategy, &sc->sc_bufstore, 1011 dev, B_WRITE, minphys, uio)); 1012 } 1013 1014 int 1015 mtioctl(dev, cmd, data, flag, p) 1016 dev_t dev; 1017 u_long cmd; 1018 caddr_t data; 1019 int flag; 1020 struct proc *p; 1021 { 1022 struct mtop *op; 1023 int cnt; 1024 1025 switch (cmd) { 1026 case MTIOCTOP: 1027 op = (struct mtop *)data; 1028 switch(op->mt_op) { 1029 case MTWEOF: 1030 case MTFSF: 1031 case MTBSR: 1032 case MTBSF: 1033 case MTFSR: 1034 cnt = op->mt_count; 1035 break; 1036 1037 case MTOFFL: 1038 case MTREW: 1039 case MTNOP: 1040 cnt = 0; 1041 break; 1042 1043 default: 1044 return (EINVAL); 1045 } 1046 return (mtcommand(dev, op->mt_op, cnt)); 1047 1048 case MTIOCGET: 1049 break; 1050 1051 default: 1052 return (EINVAL); 1053 } 1054 return (0); 1055 } 1056
Indexes created Tue Sep 23 14:10:03 GMT 2025