mt.c revision 1.14
1 /* $NetBSD: mt.c,v 1.14 2008/04/28 20:23:48 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1996-2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 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 1.14 2008/04/28 20:23:48 martin 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(id, slave, punit) 228 int id; 229 int slave; 230 int punit; 231 { 232 int i; 233 234 for (i = 0; i < nmtinfo; i++) 235 if (mtinfo[i].hwid == id) 236 break; 237 if (i == nmtinfo) 238 return (-1); 239 return (0); 240 } 241 242 int 243 mtmatch(parent, match, aux) 244 struct device *parent; 245 struct cfdata *match; 246 void *aux; 247 { 248 struct cs80bus_attach_args *ca = aux; 249 250 ca->ca_punit = 0; 251 return (mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit) == 0); 252 } 253 254 void 255 mtattach(parent, self, aux) 256 struct device *parent, *self; 257 void *aux; 258 { 259 struct mt_softc *sc = device_private(self); 260 struct cs80bus_attach_args *ca = aux; 261 int type; 262 263 sc->sc_ic = ca->ca_ic; 264 sc->sc_slave = ca->ca_slave; 265 266 if ((type = mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0) 267 return; 268 269 printf(": %s tape\n", mtinfo[type].desc); 270 271 sc->sc_type = type; 272 sc->sc_flags = MTF_EXISTS; 273 274 bufq_alloc(&sc->sc_tab, "fcfs", 0); 275 callout_init(&sc->sc_start_ch, 0); 276 callout_init(&sc->sc_intr_ch, 0); 277 278 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc, 279 &sc->sc_hdl)) { 280 aprint_error_dev(&sc->sc_dev, "can't register callback\n"); 281 return; 282 } 283 } 284 285 /* 286 * Perform a read of "Device Status Jump" register and update the 287 * status if necessary. If status is read, the given "ecmd" is also 288 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure 289 * and -2 on "temporary" failure. 290 */ 291 int 292 mtreaddsj(sc, ecmd) 293 struct mt_softc *sc; 294 int ecmd; 295 { 296 int retval; 297 298 if (sc->sc_flags & MTF_STATTIMEO) 299 goto getstats; 300 retval = gpibrecv(sc->sc_ic, 301 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave, 302 MTT_DSJ, &(sc->sc_lastdsj), 1); 303 sc->sc_flags &= ~MTF_DSJTIMEO; 304 if (retval != 1) { 305 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ", 306 device_xname(&sc->sc_dev))); 307 if (sc->sc_recvtimeo == 0) 308 sc->sc_recvtimeo = hz; 309 if (--sc->sc_recvtimeo == 0) 310 return (-1); 311 if (retval == 0) 312 sc->sc_flags |= MTF_DSJTIMEO; 313 return (-2); 314 } 315 sc->sc_recvtimeo = 0; 316 sc->sc_statindex = 0; 317 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", device_xname(&sc->sc_dev), 318 sc->sc_lastdsj)); 319 sc->sc_lastecmd = ecmd; 320 switch (sc->sc_lastdsj) { 321 case 0: 322 if (ecmd & MTE_DSJ_FORCE) 323 break; 324 return (0); 325 326 case 2: 327 sc->sc_lastecmd = MTE_COMPLETE; 328 case 1: 329 break; 330 331 default: 332 printf("%s readdsj: DSJ 0x%x\n", device_xname(&sc->sc_dev), 333 sc->sc_lastdsj); 334 return (-1); 335 } 336 337 getstats: 338 retval = gpibrecv(sc->sc_ic, 339 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT, 340 ((char *)&(sc->sc_stat)) + sc->sc_statindex, 341 sizeof(sc->sc_stat) - sc->sc_statindex); 342 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT); 343 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) { 344 if (sc->sc_recvtimeo == 0) 345 sc->sc_recvtimeo = hz; 346 if (--sc->sc_recvtimeo != 0) { 347 if (retval >= 0) { 348 sc->sc_statindex += retval; 349 sc->sc_flags |= MTF_STATCONT; 350 } 351 sc->sc_flags |= MTF_STATTIMEO; 352 return (-2); 353 } 354 printf("%s readdsj: can't read status", device_xname(&sc->sc_dev)); 355 return (-1); 356 } 357 sc->sc_recvtimeo = 0; 358 sc->sc_statindex = 0; 359 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x", 360 device_xname(&sc->sc_dev), 361 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3, 362 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6)); 363 if (sc->sc_lastecmd) 364 (void) gpibsend(sc->sc_ic, sc->sc_slave, 365 MTL_ECMD, &(sc->sc_lastecmd), 1); 366 return ((int) sc->sc_lastdsj); 367 } 368 369 int 370 mtopen(dev, flag, mode, l) 371 dev_t dev; 372 int flag, mode; 373 struct lwp *l; 374 { 375 struct mt_softc *sc; 376 int req_den; 377 int error; 378 379 sc = device_lookup(&mt_cd, MTUNIT(dev)); 380 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0) 381 return (ENXIO); 382 383 if (sc->sc_flags & MTF_OPEN) 384 return (EBUSY); 385 386 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", device_xname(&sc->sc_dev), 387 sc->sc_flags)); 388 389 sc->sc_flags |= MTF_OPEN; 390 sc->sc_ttyp = tprintf_open(l->l_proc); 391 if ((sc->sc_flags & MTF_ALIVE) == 0) { 392 error = mtcommand(dev, MTRESET, 0); 393 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0) 394 goto errout; 395 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE) 396 (void) mtcommand(dev, MTREW, 0); 397 } 398 for (;;) { 399 if ((error = mtcommand(dev, MTNOP, 0)) != 0) 400 goto errout; 401 if (!(sc->sc_flags & MTF_REW)) 402 break; 403 if (tsleep((void *) &lbolt, PCATCH | (PZERO + 1), 404 "mt", 0) != 0) { 405 error = EINTR; 406 goto errout; 407 } 408 } 409 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) { 410 error = EROFS; 411 goto errout; 412 } 413 if (!(sc->sc_stat1 & SR1_ONLINE)) { 414 uprintf("%s: not online\n", device_xname(&sc->sc_dev)); 415 error = EIO; 416 goto errout; 417 } 418 /* 419 * Select density: 420 * - find out what density the drive is set to 421 * (i.e. the density of the current tape) 422 * - if we are going to write 423 * - if we're not at the beginning of the tape 424 * - complain if we want to change densities 425 * - otherwise, select the mtcommand to set the density 426 * 427 * If the drive doesn't support it then don't change the recorded 428 * density. 429 * 430 * The original MOREbsd code had these additional conditions 431 * for the mid-tape change 432 * 433 * req_den != T_BADBPI && 434 * sc->sc_density != T_6250BPI 435 * 436 * which suggests that it would be possible to write multiple 437 * densities if req_den == T_BAD_BPI or the current tape 438 * density was 6250. Testing of our 7980 suggests that the 439 * device cannot change densities mid-tape. 440 * 441 * ajv (at) comp.vuw.ac.nz 442 */ 443 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : ( 444 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : ( 445 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1)); 446 req_den = (dev & T_DENSEL); 447 448 if (flag & FWRITE) { 449 if (!(sc->sc_stat1 & SR1_BOT)) { 450 if (sc->sc_density != req_den) { 451 uprintf("%s: can't change density mid-tape\n", 452 device_xname(&sc->sc_dev)); 453 error = EIO; 454 goto errout; 455 } 456 } 457 else { 458 int mtset_density = 459 (req_den == T_800BPI ? MTSET800BPI : ( 460 req_den == T_1600BPI ? MTSET1600BPI : ( 461 req_den == T_6250BPI ? MTSET6250BPI : ( 462 sc->sc_type == MT7980ID 463 ? MTSET6250DC 464 : MTSET6250BPI)))); 465 if (mtcommand(dev, mtset_density, 0) == 0) 466 sc->sc_density = req_den; 467 } 468 } 469 return (0); 470 errout: 471 sc->sc_flags &= ~MTF_OPEN; 472 return (error); 473 } 474 475 int 476 mtclose(dev, flag, fmt, l) 477 dev_t dev; 478 int flag, fmt; 479 struct lwp *l; 480 { 481 struct mt_softc *sc; 482 483 sc = device_lookup(&mt_cd, MTUNIT(dev)); 484 if (sc == NULL) 485 return (ENXIO); 486 487 if (sc->sc_flags & MTF_WRT) { 488 (void) mtcommand(dev, MTWEOF, 2); 489 (void) mtcommand(dev, MTBSF, 0); 490 } 491 if ((minor(dev) & T_NOREWIND) == 0) 492 (void) mtcommand(dev, MTREW, 0); 493 sc->sc_flags &= ~MTF_OPEN; 494 tprintf_close(sc->sc_ttyp); 495 return (0); 496 } 497 498 int 499 mtcommand(dev, cmd, cnt) 500 dev_t dev; 501 int cmd; 502 int cnt; 503 { 504 struct mt_softc *sc; 505 struct buf *bp; 506 int error = 0; 507 508 sc = device_lookup(&mt_cd, MTUNIT(dev)); 509 bp = &sc->sc_bufstore; 510 511 if (bp->b_cflags & BC_BUSY) 512 return (EBUSY); 513 514 bp->b_cmd = cmd; 515 bp->b_dev = dev; 516 bp->b_objlock = &buffer_lock; 517 do { 518 bp->b_cflags = BC_BUSY; 519 bp->b_flags = B_CMD; 520 bp->b_oflags = 0; 521 mtstrategy(bp); 522 biowait(bp); 523 if (bp->b_error != 0) { 524 error = (int) (unsigned) bp->b_error; 525 break; 526 } 527 } while (--cnt > 0); 528 #if 0 529 bp->b_cflags = 0 /*&= ~BC_BUSY*/; 530 #else 531 bp->b_cflags &= ~BC_BUSY; 532 #endif 533 return (error); 534 } 535 536 /* 537 * Only thing to check here is for legal record lengths (writes only). 538 */ 539 void 540 mtstrategy(bp) 541 struct buf *bp; 542 { 543 struct mt_softc *sc; 544 int s; 545 546 sc = device_lookup(&mt_cd, MTUNIT(bp->b_dev)); 547 548 DPRINTF(MDB_ANY, ("%s strategy", device_xname(&sc->sc_dev))); 549 550 if ((bp->b_flags & (B_CMD | B_READ)) == 0) { 551 #define WRITE_BITS_IGNORED 8 552 #if 0 553 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) { 554 tprintf(sc->sc_ttyp, 555 "%s: write record must be multiple of %d\n", 556 device_xname(&sc->sc_dev), 1 << WRITE_BITS_IGNORED); 557 goto error; 558 } 559 #endif 560 s = 16 * 1024; 561 if (sc->sc_stat2 & SR2_LONGREC) { 562 switch (sc->sc_density) { 563 case T_1600BPI: 564 s = 32 * 1024; 565 break; 566 567 case T_6250BPI: 568 case T_BADBPI: 569 s = 60 * 1024; 570 break; 571 } 572 } 573 if (bp->b_bcount > s) { 574 tprintf(sc->sc_ttyp, 575 "%s: write record (%d) too big: limit (%d)\n", 576 device_xname(&sc->sc_dev), bp->b_bcount, s); 577 #if 0 /* XXX see above */ 578 error: 579 #endif 580 bp->b_error = EIO; 581 biodone(bp); 582 return; 583 } 584 } 585 s = splbio(); 586 BUFQ_PUT(sc->sc_tab, bp); 587 if (sc->sc_active == 0) { 588 sc->sc_active = 1; 589 mtustart(sc); 590 } 591 splx(s); 592 } 593 594 void 595 mtustart(sc) 596 struct mt_softc *sc; 597 { 598 599 DPRINTF(MDB_ANY, ("%s ustart", device_xname(&sc->sc_dev))); 600 if (gpibrequest(sc->sc_ic, sc->sc_hdl)) 601 mtstart(sc); 602 } 603 604 void 605 mtcallback(v, action) 606 void *v; 607 int action; 608 { 609 struct mt_softc *sc = v; 610 611 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action)); 612 613 switch (action) { 614 case GPIBCBF_START: 615 mtstart(sc); 616 break; 617 case GPIBCBF_INTR: 618 mtintr(sc); 619 break; 620 #ifdef DEBUG 621 default: 622 printf("mtcallback: unknown action %d\n", action); 623 break; 624 #endif 625 } 626 } 627 628 void 629 mtintr_callout(arg) 630 void *arg; 631 { 632 struct mt_softc *sc = arg; 633 int s = splbio(); 634 635 gpibppclear(sc->sc_ic); 636 mtintr(sc); 637 splx(s); 638 } 639 640 void 641 mtstart_callout(arg) 642 void *arg; 643 { 644 int s = splbio(); 645 646 mtstart((struct mt_softc *)arg); 647 splx(s); 648 } 649 650 void 651 mtstart(sc) 652 struct mt_softc *sc; 653 { 654 struct buf *bp; 655 short cmdcount = 1; 656 u_char cmdbuf[2]; 657 658 DPRINTF(MDB_ANY, ("%s start", device_xname(&sc->sc_dev))); 659 sc->sc_flags &= ~MTF_WRT; 660 bp = BUFQ_PEEK(sc->sc_tab); 661 if ((sc->sc_flags & MTF_ALIVE) == 0 && 662 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET)) 663 goto fatalerror; 664 665 if (sc->sc_flags & MTF_REW) { 666 if (!gpibpptest(sc->sc_ic, sc->sc_slave)) 667 goto stillrew; 668 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) { 669 case 0: 670 case 1: 671 stillrew: 672 if ((sc->sc_stat1 & SR1_BOT) || 673 !(sc->sc_stat1 & SR1_ONLINE)) { 674 sc->sc_flags &= ~MTF_REW; 675 break; 676 } 677 case -2: 678 /* 679 * -2 means "timeout" reading DSJ, which is probably 680 * temporary. This is considered OK when doing a NOP, 681 * but not otherwise. 682 */ 683 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) { 684 callout_reset(&sc->sc_start_ch, hz >> 5, 685 mtstart_callout, sc); 686 return; 687 } 688 case 2: 689 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) { 690 bp->b_error = EBUSY; 691 goto done; 692 } 693 goto done; 694 695 default: 696 goto fatalerror; 697 } 698 } 699 if (bp->b_flags & B_CMD) { 700 if (sc->sc_flags & MTF_PASTEOT) { 701 switch(bp->b_cmd) { 702 case MTFSF: 703 case MTWEOF: 704 case MTFSR: 705 bp->b_error = ENOSPC; 706 goto done; 707 708 case MTBSF: 709 case MTOFFL: 710 case MTBSR: 711 case MTREW: 712 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT); 713 break; 714 } 715 } 716 switch(bp->b_cmd) { 717 case MTFSF: 718 if (sc->sc_flags & MTF_HITEOF) 719 goto done; 720 cmdbuf[0] = MTTC_FSF; 721 break; 722 723 case MTBSF: 724 if (sc->sc_flags & MTF_HITBOF) 725 goto done; 726 cmdbuf[0] = MTTC_BSF; 727 break; 728 729 case MTOFFL: 730 sc->sc_flags |= MTF_REW; 731 cmdbuf[0] = MTTC_REWOFF; 732 break; 733 734 case MTWEOF: 735 cmdbuf[0] = MTTC_WFM; 736 break; 737 738 case MTBSR: 739 cmdbuf[0] = MTTC_BSR; 740 break; 741 742 case MTFSR: 743 cmdbuf[0] = MTTC_FSR; 744 break; 745 746 case MTREW: 747 sc->sc_flags |= MTF_REW; 748 cmdbuf[0] = MTTC_REW; 749 break; 750 751 case MTNOP: 752 /* 753 * NOP is supposed to set status bits. 754 * Force readdsj to do it. 755 */ 756 switch (mtreaddsj(sc, 757 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) { 758 default: 759 goto done; 760 761 case -1: 762 /* 763 * If this fails, perform a device clear 764 * to fix any protocol problems and (most 765 * likely) get the status. 766 */ 767 bp->b_cmd = MTRESET; 768 break; 769 770 case -2: 771 callout_reset(&sc->sc_start_ch, hz >> 5, 772 mtstart_callout, sc); 773 return; 774 } 775 776 case MTRESET: 777 /* 778 * 1) selected device clear (send with "-2" secondary) 779 * 2) set timeout, then wait for "service request" 780 * 3) interrupt will read DSJ (and END COMPLETE-IDLE) 781 */ 782 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){ 783 aprint_error_dev(&sc->sc_dev, "can't reset"); 784 goto fatalerror; 785 } 786 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout, 787 sc); 788 gpibawait(sc->sc_ic); 789 return; 790 791 case MTSET800BPI: 792 cmdbuf[0] = MTTC_800; 793 break; 794 795 case MTSET1600BPI: 796 cmdbuf[0] = MTTC_1600; 797 break; 798 799 case MTSET6250BPI: 800 cmdbuf[0] = MTTC_6250; 801 break; 802 803 case MTSET6250DC: 804 cmdbuf[0] = MTTC_DC6250; 805 break; 806 } 807 } else { 808 if (sc->sc_flags & MTF_PASTEOT) { 809 bp->b_error = ENOSPC; 810 goto done; 811 } 812 if (bp->b_flags & B_READ) { 813 sc->sc_flags |= MTF_IO; 814 cmdbuf[0] = MTTC_READ; 815 } else { 816 sc->sc_flags |= MTF_WRT | MTF_IO; 817 cmdbuf[0] = MTTC_WRITE; 818 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED; 819 cmdcount = 2; 820 } 821 } 822 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount) 823 == cmdcount) { 824 if (sc->sc_flags & MTF_REW) 825 goto done; 826 gpibawait(sc->sc_ic); 827 return; 828 } 829 fatalerror: 830 /* 831 * If anything fails, the drive is probably hosed, so mark it not 832 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and 833 * if, last we heard, it was REWinding, remember that). 834 */ 835 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW; 836 bp->b_error = EIO; 837 done: 838 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 839 (void)BUFQ_GET(sc->sc_tab); 840 biodone(bp); 841 gpibrelease(sc->sc_ic, sc->sc_hdl); 842 if ((bp = BUFQ_PEEK(sc->sc_tab)) == NULL) 843 sc->sc_active = 0; 844 else 845 mtustart(sc); 846 } 847 848 void 849 mtintr(sc) 850 struct mt_softc *sc; 851 { 852 struct buf *bp; 853 int slave, dir, i; 854 u_char cmdbuf[4]; 855 856 slave = sc->sc_slave; 857 858 bp = BUFQ_PEEK(sc->sc_tab); 859 if (bp == NULL) { 860 printf("%s intr: bp == NULL", device_xname(&sc->sc_dev)); 861 return; 862 } 863 864 DPRINTF(MDB_ANY, ("%s intr", device_xname(&sc->sc_dev))); 865 866 /* 867 * Some operation completed. Read status bytes and report errors. 868 * Clear EOF flags here `cause they're set once on specific conditions 869 * below when a command succeeds. 870 * A DSJ of 2 always means keep waiting. If the command was READ 871 * (and we're in data DMA phase) stop data transfer first. 872 */ 873 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF); 874 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ && 875 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){ 876 cmdbuf[0] = MTE_STOP; 877 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1); 878 } 879 switch (mtreaddsj(sc, 0)) { 880 case 0: 881 break; 882 883 case 1: 884 /* 885 * If we're in the middle of a READ/WRITE and have yet to 886 * start the data transfer, a DSJ of one should terminate it. 887 */ 888 sc->sc_flags &= ~MTF_IO; 889 break; 890 891 case 2: 892 (void) gpibawait(sc->sc_ic); 893 return; 894 895 case -2: 896 /* 897 * -2 means that the drive failed to respond quickly enough 898 * to the request for DSJ. It's probably just "busy" figuring 899 * it out and will know in a little bit... 900 */ 901 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc); 902 return; 903 904 default: 905 printf("%s intr: can't get drive stat", device_xname(&sc->sc_dev)); 906 goto error; 907 } 908 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) { 909 i = sc->sc_stat4 & SR4_ERCLMASK; 910 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d", 911 device_xname(&sc->sc_dev), i == SR4_DEVICE ? "device" : 912 (i == SR4_PROTOCOL ? "protocol" : 913 (i == SR4_SELFTEST ? "selftest" : "unknown")), 914 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2, 915 sc->sc_stat3, sc->sc_stat5); 916 917 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET) 918 callout_stop(&sc->sc_intr_ch); 919 if (sc->sc_stat3 & SR3_POWERUP) 920 sc->sc_flags &= MTF_OPEN | MTF_EXISTS; 921 goto error; 922 } 923 /* 924 * Report and clear any soft errors. 925 */ 926 if (sc->sc_stat1 & SR1_SOFTERR) { 927 printf("%s: soft error, retry %d\n", device_xname(&sc->sc_dev), 928 sc->sc_stat4 & SR4_RETRYMASK); 929 sc->sc_stat1 &= ~SR1_SOFTERR; 930 } 931 /* 932 * We've initiated a read or write, but haven't actually started to 933 * DMA the data yet. At this point, the drive's ready. 934 */ 935 if (sc->sc_flags & MTF_IO) { 936 sc->sc_flags &= ~MTF_IO; 937 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE); 938 gpibxfer(sc->sc_ic, slave, 939 dir == GPIB_READ ? MTT_READ : MTL_WRITE, 940 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ); 941 return; 942 } 943 /* 944 * Check for End Of Tape - we're allowed to hit EOT and then write (or 945 * read) one more record. If we get here and have not already hit EOT, 946 * return ENOSPC to inform the process that it's hit it. If we get 947 * here and HAVE already hit EOT, don't allow any more operations that 948 * move the tape forward. 949 */ 950 if (sc->sc_stat1 & SR1_EOT) { 951 if (sc->sc_flags & MTF_ATEOT) 952 sc->sc_flags |= MTF_PASTEOT; 953 else { 954 bp->b_error = ENOSPC; 955 sc->sc_flags |= MTF_ATEOT; 956 } 957 } 958 /* 959 * If a motion command was being executed, check for Tape Marks. 960 * If we were doing data, make sure we got the right amount, and 961 * check for hitting tape marks on reads. 962 */ 963 if (bp->b_flags & B_CMD) { 964 if (sc->sc_stat1 & SR1_EOF) { 965 if (bp->b_cmd == MTFSR) 966 sc->sc_flags |= MTF_HITEOF; 967 if (bp->b_cmd == MTBSR) 968 sc->sc_flags |= MTF_HITBOF; 969 } 970 if (bp->b_cmd == MTRESET) { 971 callout_stop(&sc->sc_intr_ch); 972 sc->sc_flags |= MTF_ALIVE; 973 } 974 } else { 975 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2); 976 if (i != 2) { 977 aprint_error_dev(&sc->sc_dev, "intr: can't get xfer length\n"); 978 goto error; 979 } 980 i = (int) *((u_short *) cmdbuf); 981 if (i <= bp->b_bcount) { 982 if (i == 0) 983 sc->sc_flags |= MTF_HITEOF; 984 bp->b_resid = bp->b_bcount - i; 985 DPRINTF(MDB_ANY, ("%s intr: bcount %ld, resid %ld", 986 device_xname(&sc->sc_dev), bp->b_bcount, bp->b_resid)); 987 } else { 988 tprintf(sc->sc_ttyp, 989 "%s: record (%d) larger than wanted (%d)\n", 990 device_xname(&sc->sc_dev), i, bp->b_bcount); 991 error: 992 sc->sc_flags &= ~MTF_IO; 993 bp->b_error = EIO; 994 } 995 } 996 /* 997 * The operation is completely done. 998 * Let the drive know with an END command. 999 */ 1000 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE; 1001 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1); 1002 bp->b_flags &= ~B_CMD; 1003 (void)BUFQ_GET(sc->sc_tab); 1004 biodone(bp); 1005 gpibrelease(sc->sc_ic, sc->sc_hdl); 1006 if (BUFQ_PEEK(sc->sc_tab) == NULL) 1007 sc->sc_active = 0; 1008 else 1009 mtustart(sc); 1010 } 1011 1012 int 1013 mtread(dev, uio, flags) 1014 dev_t dev; 1015 struct uio *uio; 1016 int flags; 1017 { 1018 struct mt_softc *sc; 1019 1020 sc = device_lookup(&mt_cd, MTUNIT(dev)); 1021 1022 return (physio(mtstrategy, &sc->sc_bufstore, 1023 dev, B_READ, minphys, uio)); 1024 } 1025 1026 int 1027 mtwrite(dev, uio, flags) 1028 dev_t dev; 1029 struct uio *uio; 1030 int flags; 1031 { 1032 struct mt_softc *sc; 1033 1034 sc = device_lookup(&mt_cd, MTUNIT(dev)); 1035 1036 return (physio(mtstrategy, &sc->sc_bufstore, 1037 dev, B_WRITE, minphys, uio)); 1038 } 1039 1040 int 1041 mtioctl(dev, cmd, data, flag, l) 1042 dev_t dev; 1043 u_long cmd; 1044 void *data; 1045 int flag; 1046 struct lwp *l; 1047 { 1048 struct mtop *op; 1049 int cnt; 1050 1051 switch (cmd) { 1052 case MTIOCTOP: 1053 op = (struct mtop *)data; 1054 switch(op->mt_op) { 1055 case MTWEOF: 1056 case MTFSF: 1057 case MTBSR: 1058 case MTBSF: 1059 case MTFSR: 1060 cnt = op->mt_count; 1061 break; 1062 1063 case MTOFFL: 1064 case MTREW: 1065 case MTNOP: 1066 cnt = 0; 1067 break; 1068 1069 default: 1070 return (EINVAL); 1071 } 1072 return (mtcommand(dev, op->mt_op, cnt)); 1073 1074 case MTIOCGET: 1075 break; 1076 1077 default: 1078 return (EINVAL); 1079 } 1080 return (0); 1081 } 1082
Indexes created Wed Oct 01 13:09:50 GMT 2025