mt.c revision 1.17
1 /* $NetBSD: mt.c,v 1.17 2009/03/14 15:36:17 dsl 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) 1982, 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * the Systems Programming Group of the University of Utah Computer 38 * Science Department. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * from: Utah $Hdr: rd.c 1.44 92/12/26$ 65 * 66 * @(#)rd.c 8.2 (Berkeley) 5/19/94 67 */ 68 69 /* 70 * Copyright (c) 1988 University of Utah. 71 * 72 * This code is derived from software contributed to Berkeley by 73 * the Systems Programming Group of the University of Utah Computer 74 * Science Department. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. All advertising materials mentioning features or use of this software 85 * must display the following acknowledgement: 86 * This product includes software developed by the University of 87 * California, Berkeley and its contributors. 88 * 4. Neither the name of the University nor the names of its contributors 89 * may be used to endorse or promote products derived from this software 90 * without specific prior written permission. 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 93 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 95 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 96 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 97 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 98 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 100 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 101 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 102 * SUCH DAMAGE. 103 * 104 * from: Utah $Hdr: rd.c 1.44 92/12/26$ 105 * 106 * @(#)rd.c 8.2 (Berkeley) 5/19/94 107 */ 108 109 /* 110 * Magnetic tape driver (HP7974a, HP7978a/b, HP7979a, HP7980a, HP7980xc) 111 * Original version contributed by Mt. Xinu. 112 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of 113 * Computer Science, Victoria University of Wellington 114 */ 115 116 #include <sys/cdefs.h> 117 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.17 2009/03/14 15:36:17 dsl Exp $"); 118 119 #include <sys/param.h> 120 #include <sys/systm.h> 121 #include <sys/callout.h> 122 #include <sys/buf.h> 123 #include <sys/bufq.h> 124 #include <sys/ioctl.h> 125 #include <sys/mtio.h> 126 #include <sys/file.h> 127 #include <sys/proc.h> 128 #include <sys/tty.h> 129 #include <sys/kernel.h> 130 #include <sys/tprintf.h> 131 #include <sys/device.h> 132 #include <sys/conf.h> 133 134 #include <dev/gpib/gpibvar.h> 135 #include <dev/gpib/cs80busvar.h> 136 137 #include <dev/gpib/mtreg.h> 138 139 #ifdef DEBUG 140 int mtdebug = 0; 141 #define MDB_ANY 0xff 142 #define MDB_FOLLOW 0x01 143 #define DPRINTF(mask, str) if (mtdebug & (mask)) printf str 144 #else 145 #define DPRINTF(mask, str) /* nothing */ 146 #endif 147 148 struct mt_softc { 149 struct device sc_dev; 150 151 gpib_chipset_tag_t sc_ic; 152 gpib_handle_t sc_hdl; 153 154 int sc_slave; /* GPIB slave address (0-6) */ 155 short sc_flags; /* see below */ 156 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */ 157 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */ 158 short sc_recvtimeo; /* count of gpibsend timeouts to prevent hang */ 159 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */ 160 struct mt_stat sc_stat;/* status bytes last read from device */ 161 short sc_density; /* current density of tape (mtio.h format) */ 162 short sc_type; /* tape drive model (hardware IDs) */ 163 tpr_t sc_ttyp; 164 struct bufq_state *sc_tab;/* buf queue */ 165 int sc_active; 166 struct buf sc_bufstore; /* XXX buffer storage */ 167 168 struct callout sc_start_ch; 169 struct callout sc_intr_ch; 170 }; 171 172 #define MTUNIT(x) (minor(x) & 0x03) 173 174 #define B_CMD B_DEVPRIVATE /* command buf instead of data */ 175 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */ 176 177 int mtmatch(struct device *, struct cfdata *, void *); 178 void mtattach(struct device *, struct device *, void *); 179 180 CFATTACH_DECL(mt, sizeof(struct mt_softc), 181 mtmatch, mtattach, NULL, NULL); 182 183 int mtlookup(int, int, int); 184 void mtustart(struct mt_softc *); 185 int mtreaddsj(struct mt_softc *, int); 186 int mtcommand(dev_t, int, int); 187 188 void mtintr_callout(void *); 189 void mtstart_callout(void *); 190 191 void mtcallback(void *, int); 192 void mtstart(struct mt_softc *); 193 void mtintr(struct mt_softc *); 194 195 dev_type_open(mtopen); 196 dev_type_close(mtclose); 197 dev_type_read(mtread); 198 dev_type_write(mtwrite); 199 dev_type_ioctl(mtioctl); 200 dev_type_strategy(mtstrategy); 201 202 const struct bdevsw mt_bdevsw = { 203 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE 204 }; 205 206 const struct cdevsw mt_cdevsw = { 207 mtopen, mtclose, mtread, mtwrite, mtioctl, 208 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE 209 }; 210 211 212 extern struct cfdriver mt_cd; 213 214 struct mtinfo { 215 u_short hwid; 216 const char *desc; 217 } mtinfo[] = { 218 { MT7978ID, "7978" }, 219 { MT7979AID, "7979A" }, 220 { MT7980ID, "7980" }, 221 { MT7974AID, "7974A" }, 222 }; 223 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]); 224 225 226 int 227 mtlookup(int id, int slave, int punit) 228 { 229 int i; 230 231 for (i = 0; i < nmtinfo; i++) 232 if (mtinfo[i].hwid == id) 233 break; 234 if (i == nmtinfo) 235 return (-1); 236 return (0); 237 } 238 239 int 240 mtmatch(struct device *parent, struct cfdata *match, void *aux) 241 { 242 struct cs80bus_attach_args *ca = aux; 243 244 ca->ca_punit = 0; 245 return (mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit) == 0); 246 } 247 248 void 249 mtattach(parent, self, aux) 250 struct device *parent, *self; 251 void *aux; 252 { 253 struct mt_softc *sc = device_private(self); 254 struct cs80bus_attach_args *ca = aux; 255 int type; 256 257 sc->sc_ic = ca->ca_ic; 258 sc->sc_slave = ca->ca_slave; 259 260 if ((type = mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0) 261 return; 262 263 printf(": %s tape\n", mtinfo[type].desc); 264 265 sc->sc_type = type; 266 sc->sc_flags = MTF_EXISTS; 267 268 bufq_alloc(&sc->sc_tab, "fcfs", 0); 269 callout_init(&sc->sc_start_ch, 0); 270 callout_init(&sc->sc_intr_ch, 0); 271 272 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 273 &sc->sc_hdl)) { 274 aprint_error_dev(&sc->sc_dev, "can't register callback\n"); 275 return; 276 } 277 } 278 279 /* 280 * Perform a read of "Device Status Jump" register and update the 281 * status if necessary. If status is read, the given "ecmd" is also 282 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 283 * and -2 on "temporary" failure. 284 */ 285 int 286 mtreaddsj(struct mt_softc *sc, int ecmd) 287 { 288 int retval; 289 290 if (sc->sc_flags & MTF_STATTIMEO) 291 goto getstats; 292 retval = gpibrecv(sc->sc_ic, 293 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 294 MTT_DSJ, &(sc->sc_lastdsj), 1); 295 sc->sc_flags &= ~MTF_DSJTIMEO; 296 if (retval != 1) { 297 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 298 device_xname(&sc->sc_dev))); 299 if (sc->sc_recvtimeo == 0) 300 sc->sc_recvtimeo = hz; 301 if (--sc->sc_recvtimeo == 0) 302 return (-1); 303 if (retval == 0) 304 sc->sc_flags |= MTF_DSJTIMEO; 305 return (-2); 306 } 307 sc->sc_recvtimeo = 0; 308 sc->sc_statindex = 0; 309 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", device_xname(&sc->sc_dev), 310 sc->sc_lastdsj)); 311 sc->sc_lastecmd = ecmd; 312 switch (sc->sc_lastdsj) { 313 case 0: 314 if (ecmd & MTE_DSJ_FORCE) 315 break; 316 return (0); 317 318 case 2: 319 sc->sc_lastecmd = MTE_COMPLETE; 320 case 1: 321 break; 322 323 default: 324 printf("%s readdsj: DSJ 0x%x\n", device_xname(&sc->sc_dev), 325 sc->sc_lastdsj); 326 return (-1); 327 } 328 329 getstats: 330 retval = gpibrecv(sc->sc_ic, 331 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 332 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 333 sizeof(sc->sc_stat) - sc->sc_statindex); 334 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 335 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 336 if (sc->sc_recvtimeo == 0) 337 sc->sc_recvtimeo = hz; 338 if (--sc->sc_recvtimeo != 0) { 339 if (retval >= 0) { 340 sc->sc_statindex += retval; 341 sc->sc_flags |= MTF_STATCONT; 342 } 343 sc->sc_flags |= MTF_STATTIMEO; 344 return (-2); 345 } 346 printf("%s readdsj: can't read status", device_xname(&sc->sc_dev)); 347 return (-1); 348 } 349 sc->sc_recvtimeo = 0; 350 sc->sc_statindex = 0; 351 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x", 352 device_xname(&sc->sc_dev), 353 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 354 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6)); 355 if (sc->sc_lastecmd) 356 (void) gpibsend(sc->sc_ic, sc->sc_slave, 357 MTL_ECMD, &(sc->sc_lastecmd), 1); 358 return ((int) sc->sc_lastdsj); 359 } 360 361 int 362 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 363 { 364 struct mt_softc *sc; 365 int req_den; 366 int error; 367 368 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 369 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 370 return (ENXIO); 371 372 if (sc->sc_flags & MTF_OPEN) 373 return (EBUSY); 374 375 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(&sc->sc_dev), 376 sc->sc_flags)); 377 378 sc->sc_flags |= MTF_OPEN; 379 sc->sc_ttyp = tprintf_open(l->l_proc); 380 if ((sc->sc_flags & MTF_ALIVE) == 0) { 381 error = mtcommand(dev, MTRESET, 0); 382 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 383 goto errout; 384 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 385 (void) mtcommand(dev, MTREW, 0); 386 } 387 for (;;) { 388 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 389 goto errout; 390 if (!(sc->sc_flags & MTF_REW)) 391 break; 392 if (tsleep((void *) &lbolt, PCATCH | (PZERO + 1), 393 "mt", 0) != 0) { 394 error = EINTR; 395 goto errout; 396 } 397 } 398 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 399 error = EROFS; 400 goto errout; 401 } 402 if (!(sc->sc_stat1 & SR1_ONLINE)) { 403 uprintf("%s: not online\n", device_xname(&sc->sc_dev)); 404 error = EIO; 405 goto errout; 406 } 407 /* 408 * Select density: 409 * - find out what density the drive is set to 410 * (i.e. the density of the current tape) 411 * - if we are going to write 412 * - if we're not at the beginning of the tape 413 * - complain if we want to change densities 414 * - otherwise, select the mtcommand to set the density 415 * 416 * If the drive doesn't support it then don't change the recorded 417 * density. 418 * 419 * The original MOREbsd code had these additional conditions 420 * for the mid-tape change 421 * 422 * req_den != T_BADBPI && 423 * sc->sc_density != T_6250BPI 424 * 425 * which suggests that it would be possible to write multiple 426 * densities if req_den == T_BAD_BPI or the current tape 427 * density was 6250. Testing of our 7980 suggests that the 428 * device cannot change densities mid-tape. 429 * 430 * ajv (at) comp.vuw.ac.nz 431 */ 432 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 433 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 434 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 435 req_den = (dev & T_DENSEL); 436 437 if (flag & FWRITE) { 438 if (!(sc->sc_stat1 & SR1_BOT)) { 439 if (sc->sc_density != req_den) { 440 uprintf("%s: can't change density mid-tape\n", 441 device_xname(&sc->sc_dev)); 442 error = EIO; 443 goto errout; 444 } 445 } 446 else { 447 int mtset_density = 448 (req_den == T_800BPI ? MTSET800BPI : ( 449 req_den == T_1600BPI ? MTSET1600BPI : ( 450 req_den == T_6250BPI ? MTSET6250BPI : ( 451 sc->sc_type == MT7980ID 452 ? MTSET6250DC 453 : MTSET6250BPI)))); 454 if (mtcommand(dev, mtset_density, 0) == 0) 455 sc->sc_density = req_den; 456 } 457 } 458 return (0); 459 errout: 460 sc->sc_flags &= ~MTF_OPEN; 461 return (error); 462 } 463 464 int 465 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 466 { 467 struct mt_softc *sc; 468 469 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 470 if (sc == NULL) 471 return (ENXIO); 472 473 if (sc->sc_flags & MTF_WRT) { 474 (void) mtcommand(dev, MTWEOF, 2); 475 (void) mtcommand(dev, MTBSF, 0); 476 } 477 if ((minor(dev) & T_NOREWIND) == 0) 478 (void) mtcommand(dev, MTREW, 0); 479 sc->sc_flags &= ~MTF_OPEN; 480 tprintf_close(sc->sc_ttyp); 481 return (0); 482 } 483 484 int 485 mtcommand(dev_t dev, int cmd, int cnt) 486 { 487 struct mt_softc *sc; 488 struct buf *bp; 489 int error = 0; 490 491 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 492 bp = &sc->sc_bufstore; 493 494 if (bp->b_cflags & BC_BUSY) 495 return (EBUSY); 496 497 bp->b_cmd = cmd; 498 bp->b_dev = dev; 499 bp->b_objlock = &buffer_lock; 500 do { 501 bp->b_cflags = BC_BUSY; 502 bp->b_flags = B_CMD; 503 bp->b_oflags = 0; 504 mtstrategy(bp); 505 biowait(bp); 506 if (bp->b_error != 0) { 507 error = (int) (unsigned) bp->b_error; 508 break; 509 } 510 } while (--cnt > 0); 511 #if 0 512 bp->b_cflags = 0 /*&= ~BC_BUSY*/; 513 #else 514 bp->b_cflags &= ~BC_BUSY; 515 #endif 516 return (error); 517 } 518 519 /* 520 * Only thing to check here is for legal record lengths (writes only). 521 */ 522 void 523 mtstrategy(struct buf *bp) 524 { 525 struct mt_softc *sc; 526 int s; 527 528 sc = device_lookup_private(&mt_cd, MTUNIT(bp->b_dev)); 529 530 DPRINTF(MDB_ANY, ("%s strategy", device_xname(&sc->sc_dev))); 531 532 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 533 #define WRITE_BITS_IGNORED 8 534 #if 0 535 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 536 tprintf(sc->sc_ttyp, 537 "%s: write record must be multiple of %d\n", 538 device_xname(&sc->sc_dev), 1 << WRITE_BITS_IGNORED); 539 goto error; 540 } 541 #endif 542 s = 16 * 1024; 543 if (sc->sc_stat2 & SR2_LONGREC) { 544 switch (sc->sc_density) { 545 case T_1600BPI: 546 s = 32 * 1024; 547 break; 548 549 case T_6250BPI: 550 case T_BADBPI: 551 s = 60 * 1024; 552 break; 553 } 554 } 555 if (bp->b_bcount > s) { 556 tprintf(sc->sc_ttyp, 557 "%s: write record (%d) too big: limit (%d)\n", 558 device_xname(&sc->sc_dev), bp->b_bcount, s); 559 #if 0 /* XXX see above */ 560 error: 561 #endif 562 bp->b_error = EIO; 563 biodone(bp); 564 return; 565 } 566 } 567 s = splbio(); 568 bufq_put(sc->sc_tab, bp); 569 if (sc->sc_active == 0) { 570 sc->sc_active = 1; 571 mtustart(sc); 572 } 573 splx(s); 574 } 575 576 void 577 mtustart(struct mt_softc *sc) 578 { 579 580 DPRINTF(MDB_ANY, ("%s ustart", device_xname(&sc->sc_dev))); 581 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 582 mtstart(sc); 583 } 584 585 void 586 mtcallback(void *v, int action) 587 { 588 struct mt_softc *sc = v; 589 590 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 591 592 switch (action) { 593 case GPIBCBF_START: 594 mtstart(sc); 595 break; 596 case GPIBCBF_INTR: 597 mtintr(sc); 598 break; 599 #ifdef DEBUG 600 default: 601 printf("mtcallback: unknown action %d\n", action); 602 break; 603 #endif 604 } 605 } 606 607 void 608 mtintr_callout(void *arg) 609 { 610 struct mt_softc *sc = arg; 611 int s = splbio(); 612 613 gpibppclear(sc->sc_ic); 614 mtintr(sc); 615 splx(s); 616 } 617 618 void 619 mtstart_callout(void *arg) 620 { 621 int s = splbio(); 622 623 mtstart((struct mt_softc *)arg); 624 splx(s); 625 } 626 627 void 628 mtstart(struct mt_softc *sc) 629 { 630 struct buf *bp; 631 short cmdcount = 1; 632 u_char cmdbuf[2]; 633 634 DPRINTF(MDB_ANY, ("%s start", device_xname(&sc->sc_dev))); 635 sc->sc_flags &= ~MTF_WRT; 636 bp = bufq_peek(sc->sc_tab); 637 if ((sc->sc_flags & MTF_ALIVE) == 0 && 638 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 639 goto fatalerror; 640 641 if (sc->sc_flags & MTF_REW) { 642 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 643 goto stillrew; 644 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 645 case 0: 646 case 1: 647 stillrew: 648 if ((sc->sc_stat1 & SR1_BOT) || 649 !(sc->sc_stat1 & SR1_ONLINE)) { 650 sc->sc_flags &= ~MTF_REW; 651 break; 652 } 653 case -2: 654 /* 655 * -2 means "timeout" reading DSJ, which is probably 656 * temporary. This is considered OK when doing a NOP, 657 * but not otherwise. 658 */ 659 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 660 callout_reset(&sc->sc_start_ch, hz >> 5, 661 mtstart_callout, sc); 662 return; 663 } 664 case 2: 665 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 666 bp->b_error = EBUSY; 667 goto done; 668 } 669 goto done; 670 671 default: 672 goto fatalerror; 673 } 674 } 675 if (bp->b_flags & B_CMD) { 676 if (sc->sc_flags & MTF_PASTEOT) { 677 switch(bp->b_cmd) { 678 case MTFSF: 679 case MTWEOF: 680 case MTFSR: 681 bp->b_error = ENOSPC; 682 goto done; 683 684 case MTBSF: 685 case MTOFFL: 686 case MTBSR: 687 case MTREW: 688 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 689 break; 690 } 691 } 692 switch(bp->b_cmd) { 693 case MTFSF: 694 if (sc->sc_flags & MTF_HITEOF) 695 goto done; 696 cmdbuf[0] = MTTC_FSF; 697 break; 698 699 case MTBSF: 700 if (sc->sc_flags & MTF_HITBOF) 701 goto done; 702 cmdbuf[0] = MTTC_BSF; 703 break; 704 705 case MTOFFL: 706 sc->sc_flags |= MTF_REW; 707 cmdbuf[0] = MTTC_REWOFF; 708 break; 709 710 case MTWEOF: 711 cmdbuf[0] = MTTC_WFM; 712 break; 713 714 case MTBSR: 715 cmdbuf[0] = MTTC_BSR; 716 break; 717 718 case MTFSR: 719 cmdbuf[0] = MTTC_FSR; 720 break; 721 722 case MTREW: 723 sc->sc_flags |= MTF_REW; 724 cmdbuf[0] = MTTC_REW; 725 break; 726 727 case MTNOP: 728 /* 729 * NOP is supposed to set status bits. 730 * Force readdsj to do it. 731 */ 732 switch (mtreaddsj(sc, 733 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 734 default: 735 goto done; 736 737 case -1: 738 /* 739 * If this fails, perform a device clear 740 * to fix any protocol problems and (most 741 * likely) get the status. 742 */ 743 bp->b_cmd = MTRESET; 744 break; 745 746 case -2: 747 callout_reset(&sc->sc_start_ch, hz >> 5, 748 mtstart_callout, sc); 749 return; 750 } 751 752 case MTRESET: 753 /* 754 * 1) selected device clear (send with "-2" secondary) 755 * 2) set timeout, then wait for "service request" 756 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 757 */ 758 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 759 aprint_error_dev(&sc->sc_dev, "can't reset"); 760 goto fatalerror; 761 } 762 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 763 sc); 764 gpibawait(sc->sc_ic); 765 return; 766 767 case MTSET800BPI: 768 cmdbuf[0] = MTTC_800; 769 break; 770 771 case MTSET1600BPI: 772 cmdbuf[0] = MTTC_1600; 773 break; 774 775 case MTSET6250BPI: 776 cmdbuf[0] = MTTC_6250; 777 break; 778 779 case MTSET6250DC: 780 cmdbuf[0] = MTTC_DC6250; 781 break; 782 } 783 } else { 784 if (sc->sc_flags & MTF_PASTEOT) { 785 bp->b_error = ENOSPC; 786 goto done; 787 } 788 if (bp->b_flags & B_READ) { 789 sc->sc_flags |= MTF_IO; 790 cmdbuf[0] = MTTC_READ; 791 } else { 792 sc->sc_flags |= MTF_WRT | MTF_IO; 793 cmdbuf[0] = MTTC_WRITE; 794 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 795 cmdcount = 2; 796 } 797 } 798 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 799 == cmdcount) { 800 if (sc->sc_flags & MTF_REW) 801 goto done; 802 gpibawait(sc->sc_ic); 803 return; 804 } 805 fatalerror: 806 /* 807 * If anything fails, the drive is probably hosed, so mark it not 808 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 809 * if, last we heard, it was REWinding, remember that). 810 */ 811 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 812 bp->b_error = EIO; 813 done: 814 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 815 (void)bufq_get(sc->sc_tab); 816 biodone(bp); 817 gpibrelease(sc->sc_ic, sc->sc_hdl); 818 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 819 sc->sc_active = 0; 820 else 821 mtustart(sc); 822 } 823 824 void 825 mtintr(struct mt_softc *sc) 826 { 827 struct buf *bp; 828 int slave, dir, i; 829 u_char cmdbuf[4]; 830 831 slave = sc->sc_slave; 832 833 bp = bufq_peek(sc->sc_tab); 834 if (bp == NULL) { 835 printf("%s intr: bp == NULL", device_xname(&sc->sc_dev)); 836 return; 837 } 838 839 DPRINTF(MDB_ANY, ("%s intr", device_xname(&sc->sc_dev))); 840 841 /* 842 * Some operation completed. Read status bytes and report errors. 843 * Clear EOF flags here `cause they're set once on specific conditions 844 * below when a command succeeds. 845 * A DSJ of 2 always means keep waiting. If the command was READ 846 * (and we're in data DMA phase) stop data transfer first. 847 */ 848 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 849 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 850 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 851 cmdbuf[0] = MTE_STOP; 852 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 853 } 854 switch (mtreaddsj(sc, 0)) { 855 case 0: 856 break; 857 858 case 1: 859 /* 860 * If we're in the middle of a READ/WRITE and have yet to 861 * start the data transfer, a DSJ of one should terminate it. 862 */ 863 sc->sc_flags &= ~MTF_IO; 864 break; 865 866 case 2: 867 (void) gpibawait(sc->sc_ic); 868 return; 869 870 case -2: 871 /* 872 * -2 means that the drive failed to respond quickly enough 873 * to the request for DSJ. It's probably just "busy" figuring 874 * it out and will know in a little bit... 875 */ 876 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 877 return; 878 879 default: 880 printf("%s intr: can't get drive stat", device_xname(&sc->sc_dev)); 881 goto error; 882 } 883 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 884 i = sc->sc_stat4 & SR4_ERCLMASK; 885 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 886 device_xname(&sc->sc_dev), i == SR4_DEVICE ? "device" : 887 (i == SR4_PROTOCOL ? "protocol" : 888 (i == SR4_SELFTEST ? "selftest" : "unknown")), 889 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 890 sc->sc_stat3, sc->sc_stat5); 891 892 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 893 callout_stop(&sc->sc_intr_ch); 894 if (sc->sc_stat3 & SR3_POWERUP) 895 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 896 goto error; 897 } 898 /* 899 * Report and clear any soft errors. 900 */ 901 if (sc->sc_stat1 & SR1_SOFTERR) { 902 printf("%s: soft error, retry %d\n", device_xname(&sc->sc_dev), 903 sc->sc_stat4 & SR4_RETRYMASK); 904 sc->sc_stat1 &= ~SR1_SOFTERR; 905 } 906 /* 907 * We've initiated a read or write, but haven't actually started to 908 * DMA the data yet. At this point, the drive's ready. 909 */ 910 if (sc->sc_flags & MTF_IO) { 911 sc->sc_flags &= ~MTF_IO; 912 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 913 gpibxfer(sc->sc_ic, slave, 914 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 915 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 916 return; 917 } 918 /* 919 * Check for End Of Tape - we're allowed to hit EOT and then write (or 920 * read) one more record. If we get here and have not already hit EOT, 921 * return ENOSPC to inform the process that it's hit it. If we get 922 * here and HAVE already hit EOT, don't allow any more operations that 923 * move the tape forward. 924 */ 925 if (sc->sc_stat1 & SR1_EOT) { 926 if (sc->sc_flags & MTF_ATEOT) 927 sc->sc_flags |= MTF_PASTEOT; 928 else { 929 bp->b_error = ENOSPC; 930 sc->sc_flags |= MTF_ATEOT; 931 } 932 } 933 /* 934 * If a motion command was being executed, check for Tape Marks. 935 * If we were doing data, make sure we got the right amount, and 936 * check for hitting tape marks on reads. 937 */ 938 if (bp->b_flags & B_CMD) { 939 if (sc->sc_stat1 & SR1_EOF) { 940 if (bp->b_cmd == MTFSR) 941 sc->sc_flags |= MTF_HITEOF; 942 if (bp->b_cmd == MTBSR) 943 sc->sc_flags |= MTF_HITBOF; 944 } 945 if (bp->b_cmd == MTRESET) { 946 callout_stop(&sc->sc_intr_ch); 947 sc->sc_flags |= MTF_ALIVE; 948 } 949 } else { 950 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 951 if (i != 2) { 952 aprint_error_dev(&sc->sc_dev, "intr: can't get xfer length\n"); 953 goto error; 954 } 955 i = (int) *((u_short *) cmdbuf); 956 if (i <= bp->b_bcount) { 957 if (i == 0) 958 sc->sc_flags |= MTF_HITEOF; 959 bp->b_resid = bp->b_bcount - i; 960 DPRINTF(MDB_ANY, ("%s intr: bcount %ld, resid %ld", 961 device_xname(&sc->sc_dev), bp->b_bcount, bp->b_resid)); 962 } else { 963 tprintf(sc->sc_ttyp, 964 "%s: record (%d) larger than wanted (%d)\n", 965 device_xname(&sc->sc_dev), i, bp->b_bcount); 966 error: 967 sc->sc_flags &= ~MTF_IO; 968 bp->b_error = EIO; 969 } 970 } 971 /* 972 * The operation is completely done. 973 * Let the drive know with an END command. 974 */ 975 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 976 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 977 bp->b_flags &= ~B_CMD; 978 (void)bufq_get(sc->sc_tab); 979 biodone(bp); 980 gpibrelease(sc->sc_ic, sc->sc_hdl); 981 if (bufq_peek(sc->sc_tab) == NULL) 982 sc->sc_active = 0; 983 else 984 mtustart(sc); 985 } 986 987 int 988 mtread(dev_t dev, struct uio *uio, int flags) 989 { 990 struct mt_softc *sc; 991 992 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 993 994 return (physio(mtstrategy, &sc->sc_bufstore, 995 dev, B_READ, minphys, uio)); 996 } 997 998 int 999 mtwrite(dev_t dev, struct uio *uio, int flags) 1000 { 1001 struct mt_softc *sc; 1002 1003 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 1004 1005 return (physio(mtstrategy, &sc->sc_bufstore, 1006 dev, B_WRITE, minphys, uio)); 1007 } 1008 1009 int 1010 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1011 { 1012 struct mtop *op; 1013 int cnt; 1014 1015 switch (cmd) { 1016 case MTIOCTOP: 1017 op = (struct mtop *)data; 1018 switch(op->mt_op) { 1019 case MTWEOF: 1020 case MTFSF: 1021 case MTBSR: 1022 case MTBSF: 1023 case MTFSR: 1024 cnt = op->mt_count; 1025 break; 1026 1027 case MTOFFL: 1028 case MTREW: 1029 case MTNOP: 1030 cnt = 0; 1031 break; 1032 1033 default: 1034 return (EINVAL); 1035 } 1036 return (mtcommand(dev, op->mt_op, cnt)); 1037 1038 case MTIOCGET: 1039 break; 1040 1041 default: 1042 return (EINVAL); 1043 } 1044 return (0); 1045 } 1046
Indexes created Wed Oct 01 13:09:50 GMT 2025