mt.c revision 1.21
1 /* $NetBSD: mt.c,v 1.21 2009/05/18 20:41:57 ad 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 1.21 2009/05/18 20:41:57 ad 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(device_t, cfdata_t, void *); 178 void mtattach(device_t, device_t, 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(device_t parent, cfdata_t 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(device_t parent, device_t self, void *aux) 250 { 251 struct mt_softc *sc = device_private(self); 252 struct cs80bus_attach_args *ca = aux; 253 int type; 254 255 sc->sc_ic = ca->ca_ic; 256 sc->sc_slave = ca->ca_slave; 257 258 if ((type = mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0) 259 return; 260 261 printf(": %s tape\n", mtinfo[type].desc); 262 263 sc->sc_type = type; 264 sc->sc_flags = MTF_EXISTS; 265 266 bufq_alloc(&sc->sc_tab, "fcfs", 0); 267 callout_init(&sc->sc_start_ch, 0); 268 callout_init(&sc->sc_intr_ch, 0); 269 270 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 271 &sc->sc_hdl)) { 272 aprint_error_dev(&sc->sc_dev, "can't register callback\n"); 273 return; 274 } 275 } 276 277 /* 278 * Perform a read of "Device Status Jump" register and update the 279 * status if necessary. If status is read, the given "ecmd" is also 280 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 281 * and -2 on "temporary" failure. 282 */ 283 int 284 mtreaddsj(struct mt_softc *sc, int ecmd) 285 { 286 int retval; 287 288 if (sc->sc_flags & MTF_STATTIMEO) 289 goto getstats; 290 retval = gpibrecv(sc->sc_ic, 291 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 292 MTT_DSJ, &(sc->sc_lastdsj), 1); 293 sc->sc_flags &= ~MTF_DSJTIMEO; 294 if (retval != 1) { 295 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 296 device_xname(&sc->sc_dev))); 297 if (sc->sc_recvtimeo == 0) 298 sc->sc_recvtimeo = hz; 299 if (--sc->sc_recvtimeo == 0) 300 return (-1); 301 if (retval == 0) 302 sc->sc_flags |= MTF_DSJTIMEO; 303 return (-2); 304 } 305 sc->sc_recvtimeo = 0; 306 sc->sc_statindex = 0; 307 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", device_xname(&sc->sc_dev), 308 sc->sc_lastdsj)); 309 sc->sc_lastecmd = ecmd; 310 switch (sc->sc_lastdsj) { 311 case 0: 312 if (ecmd & MTE_DSJ_FORCE) 313 break; 314 return (0); 315 316 case 2: 317 sc->sc_lastecmd = MTE_COMPLETE; 318 case 1: 319 break; 320 321 default: 322 printf("%s readdsj: DSJ 0x%x\n", device_xname(&sc->sc_dev), 323 sc->sc_lastdsj); 324 return (-1); 325 } 326 327 getstats: 328 retval = gpibrecv(sc->sc_ic, 329 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 330 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 331 sizeof(sc->sc_stat) - sc->sc_statindex); 332 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 333 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 334 if (sc->sc_recvtimeo == 0) 335 sc->sc_recvtimeo = hz; 336 if (--sc->sc_recvtimeo != 0) { 337 if (retval >= 0) { 338 sc->sc_statindex += retval; 339 sc->sc_flags |= MTF_STATCONT; 340 } 341 sc->sc_flags |= MTF_STATTIMEO; 342 return (-2); 343 } 344 printf("%s readdsj: can't read status", device_xname(&sc->sc_dev)); 345 return (-1); 346 } 347 sc->sc_recvtimeo = 0; 348 sc->sc_statindex = 0; 349 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x", 350 device_xname(&sc->sc_dev), 351 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 352 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6)); 353 if (sc->sc_lastecmd) 354 (void) gpibsend(sc->sc_ic, sc->sc_slave, 355 MTL_ECMD, &(sc->sc_lastecmd), 1); 356 return ((int) sc->sc_lastdsj); 357 } 358 359 int 360 mtopen(dev_t dev, int flag, int mode, struct lwp *l) 361 { 362 struct mt_softc *sc; 363 int req_den; 364 int error; 365 366 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 367 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 368 return (ENXIO); 369 370 if (sc->sc_flags & MTF_OPEN) 371 return (EBUSY); 372 373 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(&sc->sc_dev), 374 sc->sc_flags)); 375 376 sc->sc_flags |= MTF_OPEN; 377 sc->sc_ttyp = tprintf_open(l->l_proc); 378 if ((sc->sc_flags & MTF_ALIVE) == 0) { 379 error = mtcommand(dev, MTRESET, 0); 380 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 381 goto errout; 382 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 383 (void) mtcommand(dev, MTREW, 0); 384 } 385 for (;;) { 386 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 387 goto errout; 388 if (!(sc->sc_flags & MTF_REW)) 389 break; 390 if (tsleep((void *) &lbolt, PCATCH | (PZERO + 1), 391 "mt", 0) != 0) { 392 error = EINTR; 393 goto errout; 394 } 395 } 396 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 397 error = EROFS; 398 goto errout; 399 } 400 if (!(sc->sc_stat1 & SR1_ONLINE)) { 401 uprintf("%s: not online\n", device_xname(&sc->sc_dev)); 402 error = EIO; 403 goto errout; 404 } 405 /* 406 * Select density: 407 * - find out what density the drive is set to 408 * (i.e. the density of the current tape) 409 * - if we are going to write 410 * - if we're not at the beginning of the tape 411 * - complain if we want to change densities 412 * - otherwise, select the mtcommand to set the density 413 * 414 * If the drive doesn't support it then don't change the recorded 415 * density. 416 * 417 * The original MOREbsd code had these additional conditions 418 * for the mid-tape change 419 * 420 * req_den != T_BADBPI && 421 * sc->sc_density != T_6250BPI 422 * 423 * which suggests that it would be possible to write multiple 424 * densities if req_den == T_BAD_BPI or the current tape 425 * density was 6250. Testing of our 7980 suggests that the 426 * device cannot change densities mid-tape. 427 * 428 * ajv (at) comp.vuw.ac.nz 429 */ 430 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 431 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 432 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 433 req_den = (dev & T_DENSEL); 434 435 if (flag & FWRITE) { 436 if (!(sc->sc_stat1 & SR1_BOT)) { 437 if (sc->sc_density != req_den) { 438 uprintf("%s: can't change density mid-tape\n", 439 device_xname(&sc->sc_dev)); 440 error = EIO; 441 goto errout; 442 } 443 } 444 else { 445 int mtset_density = 446 (req_den == T_800BPI ? MTSET800BPI : ( 447 req_den == T_1600BPI ? MTSET1600BPI : ( 448 req_den == T_6250BPI ? MTSET6250BPI : ( 449 sc->sc_type == MT7980ID 450 ? MTSET6250DC 451 : MTSET6250BPI)))); 452 if (mtcommand(dev, mtset_density, 0) == 0) 453 sc->sc_density = req_den; 454 } 455 } 456 return (0); 457 errout: 458 sc->sc_flags &= ~MTF_OPEN; 459 return (error); 460 } 461 462 int 463 mtclose(dev_t dev, int flag, int fmt, struct lwp *l) 464 { 465 struct mt_softc *sc; 466 467 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 468 if (sc == NULL) 469 return (ENXIO); 470 471 if (sc->sc_flags & MTF_WRT) { 472 (void) mtcommand(dev, MTWEOF, 2); 473 (void) mtcommand(dev, MTBSF, 0); 474 } 475 if ((minor(dev) & T_NOREWIND) == 0) 476 (void) mtcommand(dev, MTREW, 0); 477 sc->sc_flags &= ~MTF_OPEN; 478 tprintf_close(sc->sc_ttyp); 479 return (0); 480 } 481 482 int 483 mtcommand(dev_t dev, int cmd, int cnt) 484 { 485 struct mt_softc *sc; 486 struct buf *bp; 487 int error = 0; 488 489 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 490 bp = &sc->sc_bufstore; 491 492 if (bp->b_cflags & BC_BUSY) 493 return (EBUSY); 494 495 bp->b_cmd = cmd; 496 bp->b_dev = dev; 497 bp->b_objlock = &buffer_lock; 498 do { 499 bp->b_cflags = BC_BUSY; 500 bp->b_flags = B_CMD; 501 bp->b_oflags = 0; 502 mtstrategy(bp); 503 biowait(bp); 504 if (bp->b_error != 0) { 505 error = (int) (unsigned) bp->b_error; 506 break; 507 } 508 } while (--cnt > 0); 509 #if 0 510 bp->b_cflags = 0 /*&= ~BC_BUSY*/; 511 #else 512 bp->b_cflags &= ~BC_BUSY; 513 #endif 514 return (error); 515 } 516 517 /* 518 * Only thing to check here is for legal record lengths (writes only). 519 */ 520 void 521 mtstrategy(struct buf *bp) 522 { 523 struct mt_softc *sc; 524 int s; 525 526 sc = device_lookup_private(&mt_cd, MTUNIT(bp->b_dev)); 527 528 DPRINTF(MDB_ANY, ("%s strategy", device_xname(&sc->sc_dev))); 529 530 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 531 #define WRITE_BITS_IGNORED 8 532 #if 0 533 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 534 tprintf(sc->sc_ttyp, 535 "%s: write record must be multiple of %d\n", 536 device_xname(&sc->sc_dev), 1 << WRITE_BITS_IGNORED); 537 goto error; 538 } 539 #endif 540 s = 16 * 1024; 541 if (sc->sc_stat2 & SR2_LONGREC) { 542 switch (sc->sc_density) { 543 case T_1600BPI: 544 s = 32 * 1024; 545 break; 546 547 case T_6250BPI: 548 case T_BADBPI: 549 s = 60 * 1024; 550 break; 551 } 552 } 553 if (bp->b_bcount > s) { 554 tprintf(sc->sc_ttyp, 555 "%s: write record (%d) too big: limit (%d)\n", 556 device_xname(&sc->sc_dev), bp->b_bcount, s); 557 #if 0 /* XXX see above */ 558 error: 559 #endif 560 bp->b_error = EIO; 561 biodone(bp); 562 return; 563 } 564 } 565 s = splbio(); 566 bufq_put(sc->sc_tab, bp); 567 if (sc->sc_active == 0) { 568 sc->sc_active = 1; 569 mtustart(sc); 570 } 571 splx(s); 572 } 573 574 void 575 mtustart(struct mt_softc *sc) 576 { 577 578 DPRINTF(MDB_ANY, ("%s ustart", device_xname(&sc->sc_dev))); 579 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 580 mtstart(sc); 581 } 582 583 void 584 mtcallback(void *v, int action) 585 { 586 struct mt_softc *sc = v; 587 588 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 589 590 switch (action) { 591 case GPIBCBF_START: 592 mtstart(sc); 593 break; 594 case GPIBCBF_INTR: 595 mtintr(sc); 596 break; 597 #ifdef DEBUG 598 default: 599 printf("mtcallback: unknown action %d\n", action); 600 break; 601 #endif 602 } 603 } 604 605 void 606 mtintr_callout(void *arg) 607 { 608 struct mt_softc *sc = arg; 609 int s = splbio(); 610 611 gpibppclear(sc->sc_ic); 612 mtintr(sc); 613 splx(s); 614 } 615 616 void 617 mtstart_callout(void *arg) 618 { 619 int s = splbio(); 620 621 mtstart((struct mt_softc *)arg); 622 splx(s); 623 } 624 625 void 626 mtstart(struct mt_softc *sc) 627 { 628 struct buf *bp; 629 short cmdcount = 1; 630 u_char cmdbuf[2]; 631 632 DPRINTF(MDB_ANY, ("%s start", device_xname(&sc->sc_dev))); 633 sc->sc_flags &= ~MTF_WRT; 634 bp = bufq_peek(sc->sc_tab); 635 if ((sc->sc_flags & MTF_ALIVE) == 0 && 636 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 637 goto fatalerror; 638 639 if (sc->sc_flags & MTF_REW) { 640 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 641 goto stillrew; 642 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 643 case 0: 644 case 1: 645 stillrew: 646 if ((sc->sc_stat1 & SR1_BOT) || 647 !(sc->sc_stat1 & SR1_ONLINE)) { 648 sc->sc_flags &= ~MTF_REW; 649 break; 650 } 651 case -2: 652 /* 653 * -2 means "timeout" reading DSJ, which is probably 654 * temporary. This is considered OK when doing a NOP, 655 * but not otherwise. 656 */ 657 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 658 callout_reset(&sc->sc_start_ch, hz >> 5, 659 mtstart_callout, sc); 660 return; 661 } 662 case 2: 663 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 664 bp->b_error = EBUSY; 665 goto done; 666 } 667 goto done; 668 669 default: 670 goto fatalerror; 671 } 672 } 673 if (bp->b_flags & B_CMD) { 674 if (sc->sc_flags & MTF_PASTEOT) { 675 switch(bp->b_cmd) { 676 case MTFSF: 677 case MTWEOF: 678 case MTFSR: 679 bp->b_error = ENOSPC; 680 goto done; 681 682 case MTBSF: 683 case MTOFFL: 684 case MTBSR: 685 case MTREW: 686 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 687 break; 688 } 689 } 690 switch(bp->b_cmd) { 691 case MTFSF: 692 if (sc->sc_flags & MTF_HITEOF) 693 goto done; 694 cmdbuf[0] = MTTC_FSF; 695 break; 696 697 case MTBSF: 698 if (sc->sc_flags & MTF_HITBOF) 699 goto done; 700 cmdbuf[0] = MTTC_BSF; 701 break; 702 703 case MTOFFL: 704 sc->sc_flags |= MTF_REW; 705 cmdbuf[0] = MTTC_REWOFF; 706 break; 707 708 case MTWEOF: 709 cmdbuf[0] = MTTC_WFM; 710 break; 711 712 case MTBSR: 713 cmdbuf[0] = MTTC_BSR; 714 break; 715 716 case MTFSR: 717 cmdbuf[0] = MTTC_FSR; 718 break; 719 720 case MTREW: 721 sc->sc_flags |= MTF_REW; 722 cmdbuf[0] = MTTC_REW; 723 break; 724 725 case MTNOP: 726 /* 727 * NOP is supposed to set status bits. 728 * Force readdsj to do it. 729 */ 730 switch (mtreaddsj(sc, 731 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 732 default: 733 goto done; 734 735 case -1: 736 /* 737 * If this fails, perform a device clear 738 * to fix any protocol problems and (most 739 * likely) get the status. 740 */ 741 bp->b_cmd = MTRESET; 742 break; 743 744 case -2: 745 callout_reset(&sc->sc_start_ch, hz >> 5, 746 mtstart_callout, sc); 747 return; 748 } 749 750 case MTRESET: 751 /* 752 * 1) selected device clear (send with "-2" secondary) 753 * 2) set timeout, then wait for "service request" 754 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 755 */ 756 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 757 aprint_error_dev(&sc->sc_dev, "can't reset"); 758 goto fatalerror; 759 } 760 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 761 sc); 762 gpibawait(sc->sc_ic); 763 return; 764 765 case MTSET800BPI: 766 cmdbuf[0] = MTTC_800; 767 break; 768 769 case MTSET1600BPI: 770 cmdbuf[0] = MTTC_1600; 771 break; 772 773 case MTSET6250BPI: 774 cmdbuf[0] = MTTC_6250; 775 break; 776 777 case MTSET6250DC: 778 cmdbuf[0] = MTTC_DC6250; 779 break; 780 } 781 } else { 782 if (sc->sc_flags & MTF_PASTEOT) { 783 bp->b_error = ENOSPC; 784 goto done; 785 } 786 if (bp->b_flags & B_READ) { 787 sc->sc_flags |= MTF_IO; 788 cmdbuf[0] = MTTC_READ; 789 } else { 790 sc->sc_flags |= MTF_WRT | MTF_IO; 791 cmdbuf[0] = MTTC_WRITE; 792 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 793 cmdcount = 2; 794 } 795 } 796 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 797 == cmdcount) { 798 if (sc->sc_flags & MTF_REW) 799 goto done; 800 gpibawait(sc->sc_ic); 801 return; 802 } 803 fatalerror: 804 /* 805 * If anything fails, the drive is probably hosed, so mark it not 806 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 807 * if, last we heard, it was REWinding, remember that). 808 */ 809 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 810 bp->b_error = EIO; 811 done: 812 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 813 (void)bufq_get(sc->sc_tab); 814 biodone(bp); 815 gpibrelease(sc->sc_ic, sc->sc_hdl); 816 if ((bp = bufq_peek(sc->sc_tab)) == NULL) 817 sc->sc_active = 0; 818 else 819 mtustart(sc); 820 } 821 822 void 823 mtintr(struct mt_softc *sc) 824 { 825 struct buf *bp; 826 int slave, dir, i; 827 u_char cmdbuf[4]; 828 829 slave = sc->sc_slave; 830 831 bp = bufq_peek(sc->sc_tab); 832 if (bp == NULL) { 833 printf("%s intr: bp == NULL", device_xname(&sc->sc_dev)); 834 return; 835 } 836 837 DPRINTF(MDB_ANY, ("%s intr", device_xname(&sc->sc_dev))); 838 839 /* 840 * Some operation completed. Read status bytes and report errors. 841 * Clear EOF flags here `cause they're set once on specific conditions 842 * below when a command succeeds. 843 * A DSJ of 2 always means keep waiting. If the command was READ 844 * (and we're in data DMA phase) stop data transfer first. 845 */ 846 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 847 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 848 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 849 cmdbuf[0] = MTE_STOP; 850 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 851 } 852 switch (mtreaddsj(sc, 0)) { 853 case 0: 854 break; 855 856 case 1: 857 /* 858 * If we're in the middle of a READ/WRITE and have yet to 859 * start the data transfer, a DSJ of one should terminate it. 860 */ 861 sc->sc_flags &= ~MTF_IO; 862 break; 863 864 case 2: 865 (void) gpibawait(sc->sc_ic); 866 return; 867 868 case -2: 869 /* 870 * -2 means that the drive failed to respond quickly enough 871 * to the request for DSJ. It's probably just "busy" figuring 872 * it out and will know in a little bit... 873 */ 874 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 875 return; 876 877 default: 878 printf("%s intr: can't get drive stat", device_xname(&sc->sc_dev)); 879 goto error; 880 } 881 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 882 i = sc->sc_stat4 & SR4_ERCLMASK; 883 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 884 device_xname(&sc->sc_dev), i == SR4_DEVICE ? "device" : 885 (i == SR4_PROTOCOL ? "protocol" : 886 (i == SR4_SELFTEST ? "selftest" : "unknown")), 887 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 888 sc->sc_stat3, sc->sc_stat5); 889 890 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 891 callout_stop(&sc->sc_intr_ch); 892 if (sc->sc_stat3 & SR3_POWERUP) 893 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 894 goto error; 895 } 896 /* 897 * Report and clear any soft errors. 898 */ 899 if (sc->sc_stat1 & SR1_SOFTERR) { 900 printf("%s: soft error, retry %d\n", device_xname(&sc->sc_dev), 901 sc->sc_stat4 & SR4_RETRYMASK); 902 sc->sc_stat1 &= ~SR1_SOFTERR; 903 } 904 /* 905 * We've initiated a read or write, but haven't actually started to 906 * DMA the data yet. At this point, the drive's ready. 907 */ 908 if (sc->sc_flags & MTF_IO) { 909 sc->sc_flags &= ~MTF_IO; 910 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 911 gpibxfer(sc->sc_ic, slave, 912 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 913 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 914 return; 915 } 916 /* 917 * Check for End Of Tape - we're allowed to hit EOT and then write (or 918 * read) one more record. If we get here and have not already hit EOT, 919 * return ENOSPC to inform the process that it's hit it. If we get 920 * here and HAVE already hit EOT, don't allow any more operations that 921 * move the tape forward. 922 */ 923 if (sc->sc_stat1 & SR1_EOT) { 924 if (sc->sc_flags & MTF_ATEOT) 925 sc->sc_flags |= MTF_PASTEOT; 926 else { 927 bp->b_error = ENOSPC; 928 sc->sc_flags |= MTF_ATEOT; 929 } 930 } 931 /* 932 * If a motion command was being executed, check for Tape Marks. 933 * If we were doing data, make sure we got the right amount, and 934 * check for hitting tape marks on reads. 935 */ 936 if (bp->b_flags & B_CMD) { 937 if (sc->sc_stat1 & SR1_EOF) { 938 if (bp->b_cmd == MTFSR) 939 sc->sc_flags |= MTF_HITEOF; 940 if (bp->b_cmd == MTBSR) 941 sc->sc_flags |= MTF_HITBOF; 942 } 943 if (bp->b_cmd == MTRESET) { 944 callout_stop(&sc->sc_intr_ch); 945 sc->sc_flags |= MTF_ALIVE; 946 } 947 } else { 948 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 949 if (i != 2) { 950 aprint_error_dev(&sc->sc_dev, "intr: can't get xfer length\n"); 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 device_xname(&sc->sc_dev), bp->b_bcount, bp->b_resid)); 960 } else { 961 tprintf(sc->sc_ttyp, 962 "%s: record (%d) larger than wanted (%d)\n", 963 device_xname(&sc->sc_dev), i, bp->b_bcount); 964 error: 965 sc->sc_flags &= ~MTF_IO; 966 bp->b_error = EIO; 967 } 968 } 969 /* 970 * The operation is completely done. 971 * Let the drive know with an END command. 972 */ 973 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 974 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 975 bp->b_flags &= ~B_CMD; 976 (void)bufq_get(sc->sc_tab); 977 biodone(bp); 978 gpibrelease(sc->sc_ic, sc->sc_hdl); 979 if (bufq_peek(sc->sc_tab) == NULL) 980 sc->sc_active = 0; 981 else 982 mtustart(sc); 983 } 984 985 int 986 mtread(dev_t dev, struct uio *uio, int flags) 987 { 988 struct mt_softc *sc; 989 990 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 991 992 return (physio(mtstrategy, NULL, dev, B_READ, minphys, uio)); 993 } 994 995 int 996 mtwrite(dev_t dev, struct uio *uio, int flags) 997 { 998 struct mt_softc *sc; 999 1000 sc = device_lookup_private(&mt_cd, MTUNIT(dev)); 1001 1002 return (physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio)); 1003 } 1004 1005 int 1006 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1007 { 1008 struct mtop *op; 1009 int cnt; 1010 1011 switch (cmd) { 1012 case MTIOCTOP: 1013 op = (struct mtop *)data; 1014 switch(op->mt_op) { 1015 case MTWEOF: 1016 case MTFSF: 1017 case MTBSR: 1018 case MTBSF: 1019 case MTFSR: 1020 cnt = op->mt_count; 1021 break; 1022 1023 case MTOFFL: 1024 case MTREW: 1025 case MTNOP: 1026 cnt = 0; 1027 break; 1028 1029 default: 1030 return (EINVAL); 1031 } 1032 return (mtcommand(dev, op->mt_op, cnt)); 1033 1034 case MTIOCGET: 1035 break; 1036 1037 default: 1038 return (EINVAL); 1039 } 1040 return (0); 1041 } 1042
Indexes created Fri Sep 26 20:09:58 GMT 2025