FreeBSD/Linux Kernel Cross Reference
sys/dev/gpib/mt.c
1 /* $NetBSD: mt.c,v 1.2 2003/08/07 16:30:56 agc 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) 1982, 1990, 1993
41 * The Regents of the University of California. All rights reserved.
42 *
43 * This code is derived from software contributed to Berkeley by
44 * the Systems Programming Group of the University of Utah Computer
45 * Science Department.
46 *
47 * Redistribution and use in source and binary forms, with or without
48 * modification, are permitted provided that the following conditions
49 * are met:
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 * 2. Redistributions in binary form must reproduce the above copyright
53 * notice, this list of conditions and the following disclaimer in the
54 * documentation and/or other materials provided with the distribution.
55 * 3. Neither the name of the University nor the names of its contributors
56 * may be used to endorse or promote products derived from this software
57 * without specific prior written permission.
58 *
59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69 * SUCH DAMAGE.
70 *
71 * from: Utah $Hdr: rd.c 1.44 92/12/26$
72 *
73 * @(#)rd.c 8.2 (Berkeley) 5/19/94
74 */
75
76 /*
77 * Copyright (c) 1988 University of Utah.
78 *
79 * This code is derived from software contributed to Berkeley by
80 * the Systems Programming Group of the University of Utah Computer
81 * Science Department.
82 *
83 * Redistribution and use in source and binary forms, with or without
84 * modification, are permitted provided that the following conditions
85 * are met:
86 * 1. Redistributions of source code must retain the above copyright
87 * notice, this list of conditions and the following disclaimer.
88 * 2. Redistributions in binary form must reproduce the above copyright
89 * notice, this list of conditions and the following disclaimer in the
90 * documentation and/or other materials provided with the distribution.
91 * 3. All advertising materials mentioning features or use of this software
92 * must display the following acknowledgement:
93 * This product includes software developed by the University of
94 * California, Berkeley and its contributors.
95 * 4. Neither the name of the University nor the names of its contributors
96 * may be used to endorse or promote products derived from this software
97 * without specific prior written permission.
98 *
99 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
100 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
101 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
102 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
103 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
104 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
105 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
106 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
107 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
108 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
109 * SUCH DAMAGE.
110 *
111 * from: Utah $Hdr: rd.c 1.44 92/12/26$
112 *
113 * @(#)rd.c 8.2 (Berkeley) 5/19/94
114 */
115
116 /*
117 * Magnetic tape driver (HP7974a, HP7978a/b, HP7979a, HP7980a, HP7980xc)
118 * Original version contributed by Mt. Xinu.
119 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of
120 * Computer Science, Victoria University of Wellington
121 */
122
123 #include <sys/cdefs.h>
124 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.2 2003/08/07 16:30:56 agc Exp $");
125
126 #include <sys/param.h>
127 #include <sys/systm.h>
128 #include <sys/callout.h>
129 #include <sys/buf.h>
130 #include <sys/ioctl.h>
131 #include <sys/mtio.h>
132 #include <sys/file.h>
133 #include <sys/proc.h>
134 #include <sys/tty.h>
135 #include <sys/kernel.h>
136 #include <sys/tprintf.h>
137 #include <sys/device.h>
138 #include <sys/conf.h>
139
140 #include <dev/gpib/gpibvar.h>
141 #include <dev/gpib/cs80busvar.h>
142
143 #include <dev/gpib/mtreg.h>
144
145 #ifdef DEBUG
146 int mtdebug = 0;
147 #define MDB_ANY 0xff
148 #define MDB_FOLLOW 0x01
149 #define DPRINTF(mask, str) if (mtdebug & (mask)) printf str
150 #else
151 #define DPRINTF(mask, str) /* nothing */
152 #endif
153
154 struct mt_softc {
155 struct device sc_dev;
156
157 gpib_chipset_tag_t sc_ic;
158 gpib_handle_t sc_hdl;
159
160 int sc_slave; /* GPIB slave address (0-6) */
161 short sc_flags; /* see below */
162 u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */
163 u_char sc_lastecmd; /* place for End Command in mtreaddsj() */
164 short sc_recvtimeo; /* count of gpibsend timeouts to prevent hang */
165 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */
166 struct mt_stat sc_stat;/* status bytes last read from device */
167 short sc_density; /* current density of tape (mtio.h format) */
168 short sc_type; /* tape drive model (hardware IDs) */
169 tpr_t sc_ttyp;
170 struct bufq_state sc_tab;/* buf queue */
171 int sc_active;
172 struct buf sc_bufstore; /* XXX buffer storage */
173
174 struct callout sc_start_ch;
175 struct callout sc_intr_ch;
176 };
177
178 #define MTUNIT(x) (minor(x) & 0x03)
179
180 #define B_CMD B_XXX /* command buf instead of data */
181 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */
182
183 int mtmatch(struct device *, struct cfdata *, void *);
184 void mtattach(struct device *, struct device *, void *);
185
186 CFATTACH_DECL(mt, sizeof(struct mt_softc),
187 mtmatch, mtattach, NULL, NULL);
188
189 int mtlookup(int, int, int);
190 void mtustart(struct mt_softc *);
191 int mtreaddsj(struct mt_softc *, int);
192 int mtcommand(dev_t, int, int);
193
194 void mtintr_callout(void *);
195 void mtstart_callout(void *);
196
197 void mtcallback(void *, int);
198 void mtstart(struct mt_softc *);
199 void mtintr(struct mt_softc *);
200
201 dev_type_open(mtopen);
202 dev_type_close(mtclose);
203 dev_type_read(mtread);
204 dev_type_write(mtwrite);
205 dev_type_ioctl(mtioctl);
206 dev_type_strategy(mtstrategy);
207
208 const struct bdevsw mt_bdevsw = {
209 mtopen, mtclose, mtstrategy, mtioctl, nodump, nosize, D_TAPE
210 };
211
212 const struct cdevsw mt_cdevsw = {
213 mtopen, mtclose, mtread, mtwrite, mtioctl,
214 nostop, notty, nopoll, nommap, nokqfilter, D_TAPE
215 };
216
217
218 extern struct cfdriver mt_cd;
219
220 struct mtinfo {
221 u_short hwid;
222 char *desc;
223 } mtinfo[] = {
224 { MT7978ID, "7978" },
225 { MT7979AID, "7979A" },
226 { MT7980ID, "7980" },
227 { MT7974AID, "7974A" },
228 };
229 int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]);
230
231
232 int
233 mtlookup(id, slave, punit)
234 int id;
235 int slave;
236 int punit;
237 {
238 int i;
239
240 for (i = 0; i < nmtinfo; i++)
241 if (mtinfo[i].hwid == id)
242 break;
243 if (i == nmtinfo)
244 return (-1);
245 return (0);
246 }
247
248 int
249 mtmatch(parent, match, aux)
250 struct device *parent;
251 struct cfdata *match;
252 void *aux;
253 {
254 struct cs80bus_attach_args *ca = aux;
255
256 ca->ca_punit = 0;
257 return (mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit) == 0);
258 }
259
260 void
261 mtattach(parent, self, aux)
262 struct device *parent, *self;
263 void *aux;
264 {
265 struct mt_softc *sc = (struct mt_softc *)self;
266 struct cs80bus_attach_args *ca = aux;
267 int type;
268
269 sc->sc_ic = ca->ca_ic;
270 sc->sc_slave = ca->ca_slave;
271
272 if ((type = mtlookup(ca->ca_id, ca->ca_slave, ca->ca_punit)) < 0)
273 return;
274
275 printf(": %s tape\n", mtinfo[type].desc);
276
277 sc->sc_type = type;
278 sc->sc_flags = MTF_EXISTS;
279
280 bufq_alloc(&sc->sc_tab, BUFQ_FCFS);
281 callout_init(&sc->sc_start_ch);
282 callout_init(&sc->sc_intr_ch);
283
284 if (gpibregister(sc->sc_ic, sc->sc_slave, mtcallback, sc,
285 &sc->sc_hdl)) {
286 printf("%s: can't register callback\n", sc->sc_dev.dv_xname);
287 return;
288 }
289 }
290
291 /*
292 * Perform a read of "Device Status Jump" register and update the
293 * status if necessary. If status is read, the given "ecmd" is also
294 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure
295 * and -2 on "temporary" failure.
296 */
297 int
298 mtreaddsj(sc, ecmd)
299 struct mt_softc *sc;
300 int ecmd;
301 {
302 int retval;
303
304 if (sc->sc_flags & MTF_STATTIMEO)
305 goto getstats;
306 retval = gpibrecv(sc->sc_ic,
307 (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave,
308 MTT_DSJ, &(sc->sc_lastdsj), 1);
309 sc->sc_flags &= ~MTF_DSJTIMEO;
310 if (retval != 1) {
311 DPRINTF(MDB_ANY, ("%s can't gpibrecv DSJ",
312 sc->sc_dev.dv_xname));
313 if (sc->sc_recvtimeo == 0)
314 sc->sc_recvtimeo = hz;
315 if (--sc->sc_recvtimeo == 0)
316 return (-1);
317 if (retval == 0)
318 sc->sc_flags |= MTF_DSJTIMEO;
319 return (-2);
320 }
321 sc->sc_recvtimeo = 0;
322 sc->sc_statindex = 0;
323 DPRINTF(MDB_ANY, ("%s readdsj: 0x%x", sc->sc_dev.dv_xname,
324 sc->sc_lastdsj));
325 sc->sc_lastecmd = ecmd;
326 switch (sc->sc_lastdsj) {
327 case 0:
328 if (ecmd & MTE_DSJ_FORCE)
329 break;
330 return (0);
331
332 case 2:
333 sc->sc_lastecmd = MTE_COMPLETE;
334 case 1:
335 break;
336
337 default:
338 printf("%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname,
339 sc->sc_lastdsj);
340 return (-1);
341 }
342
343 getstats:
344 retval = gpibrecv(sc->sc_ic,
345 (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave, MTT_STAT,
346 ((char *)&(sc->sc_stat)) + sc->sc_statindex,
347 sizeof(sc->sc_stat) - sc->sc_statindex);
348 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT);
349 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) {
350 if (sc->sc_recvtimeo == 0)
351 sc->sc_recvtimeo = hz;
352 if (--sc->sc_recvtimeo != 0) {
353 if (retval >= 0) {
354 sc->sc_statindex += retval;
355 sc->sc_flags |= MTF_STATCONT;
356 }
357 sc->sc_flags |= MTF_STATTIMEO;
358 return (-2);
359 }
360 printf("%s readdsj: can't read status", sc->sc_dev.dv_xname);
361 return (-1);
362 }
363 sc->sc_recvtimeo = 0;
364 sc->sc_statindex = 0;
365 DPRINTF(MDB_ANY, ("%s readdsj: status is %x %x %x %x %x %x",
366 sc->sc_dev.dv_xname,
367 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3,
368 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6));
369 if (sc->sc_lastecmd)
370 (void) gpibsend(sc->sc_ic, sc->sc_slave,
371 MTL_ECMD, &(sc->sc_lastecmd), 1);
372 return ((int) sc->sc_lastdsj);
373 }
374
375 int
376 mtopen(dev, flag, mode, p)
377 dev_t dev;
378 int flag, mode;
379 struct proc *p;
380 {
381 struct mt_softc *sc;
382 int req_den;
383 int error;
384
385 sc = device_lookup(&mt_cd, MTUNIT(dev));
386 if (sc == NULL || (sc->sc_flags & MTF_EXISTS) == 0)
387 return (ENXIO);
388
389 if (sc->sc_flags & MTF_OPEN)
390 return (EBUSY);
391
392 DPRINTF(MDB_ANY, ("%s open: flags 0x%x", sc->sc_dev.dv_xname,
393 sc->sc_flags));
394
395 sc->sc_flags |= MTF_OPEN;
396 sc->sc_ttyp = tprintf_open(p);
397 if ((sc->sc_flags & MTF_ALIVE) == 0) {
398 error = mtcommand(dev, MTRESET, 0);
399 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0)
400 goto errout;
401 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE)
402 (void) mtcommand(dev, MTREW, 0);
403 }
404 for (;;) {
405 if ((error = mtcommand(dev, MTNOP, 0)) != 0)
406 goto errout;
407 if (!(sc->sc_flags & MTF_REW))
408 break;
409 if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1),
410 "mt", 0) != 0) {
411 error = EINTR;
412 goto errout;
413 }
414 }
415 if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) {
416 error = EROFS;
417 goto errout;
418 }
419 if (!(sc->sc_stat1 & SR1_ONLINE)) {
420 uprintf("%s: not online\n", sc->sc_dev.dv_xname);
421 error = EIO;
422 goto errout;
423 }
424 /*
425 * Select density:
426 * - find out what density the drive is set to
427 * (i.e. the density of the current tape)
428 * - if we are going to write
429 * - if we're not at the beginning of the tape
430 * - complain if we want to change densities
431 * - otherwise, select the mtcommand to set the density
432 *
433 * If the drive doesn't support it then don't change the recorded
434 * density.
435 *
436 * The original MOREbsd code had these additional conditions
437 * for the mid-tape change
438 *
439 * req_den != T_BADBPI &&
440 * sc->sc_density != T_6250BPI
441 *
442 * which suggests that it would be possible to write multiple
443 * densities if req_den == T_BAD_BPI or the current tape
444 * density was 6250. Testing of our 7980 suggests that the
445 * device cannot change densities mid-tape.
446 *
447 * ajv@comp.vuw.ac.nz
448 */
449 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : (
450 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : (
451 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1));
452 req_den = (dev & T_DENSEL);
453
454 if (flag & FWRITE) {
455 if (!(sc->sc_stat1 & SR1_BOT)) {
456 if (sc->sc_density != req_den) {
457 uprintf("%s: can't change density mid-tape\n",
458 sc->sc_dev.dv_xname);
459 error = EIO;
460 goto errout;
461 }
462 }
463 else {
464 int mtset_density =
465 (req_den == T_800BPI ? MTSET800BPI : (
466 req_den == T_1600BPI ? MTSET1600BPI : (
467 req_den == T_6250BPI ? MTSET6250BPI : (
468 sc->sc_type == MT7980ID
469 ? MTSET6250DC
470 : MTSET6250BPI))));
471 if (mtcommand(dev, mtset_density, 0) == 0)
472 sc->sc_density = req_den;
473 }
474 }
475 return (0);
476 errout:
477 sc->sc_flags &= ~MTF_OPEN;
478 return (error);
479 }
480
481 int
482 mtclose(dev, flag, fmt, p)
483 dev_t dev;
484 int flag, fmt;
485 struct proc *p;
486 {
487 struct mt_softc *sc;
488
489 sc = device_lookup(&mt_cd, MTUNIT(dev));
490 if (sc == NULL)
491 return (ENXIO);
492
493 if (sc->sc_flags & MTF_WRT) {
494 (void) mtcommand(dev, MTWEOF, 2);
495 (void) mtcommand(dev, MTBSF, 0);
496 }
497 if ((minor(dev) & T_NOREWIND) == 0)
498 (void) mtcommand(dev, MTREW, 0);
499 sc->sc_flags &= ~MTF_OPEN;
500 tprintf_close(sc->sc_ttyp);
501 return (0);
502 }
503
504 int
505 mtcommand(dev, cmd, cnt)
506 dev_t dev;
507 int cmd;
508 int cnt;
509 {
510 struct mt_softc *sc;
511 struct buf *bp;
512 int error = 0;
513
514 sc = device_lookup(&mt_cd, MTUNIT(dev));
515 bp = &sc->sc_bufstore;
516
517 if (bp->b_flags & B_BUSY)
518 return (EBUSY);
519
520 bp->b_cmd = cmd;
521 bp->b_dev = dev;
522 do {
523 bp->b_flags = B_BUSY | B_CMD;
524 mtstrategy(bp);
525 biowait(bp);
526 if (bp->b_flags & B_ERROR) {
527 error = (int) (unsigned) bp->b_error;
528 break;
529 }
530 } while (--cnt > 0);
531 #if 0
532 bp->b_flags = 0 /*&= ~B_BUSY*/;
533 #else
534 bp->b_flags &= ~B_BUSY;
535 #endif
536 return (error);
537 }
538
539 /*
540 * Only thing to check here is for legal record lengths (writes only).
541 */
542 void
543 mtstrategy(bp)
544 struct buf *bp;
545 {
546 struct mt_softc *sc;
547 int s;
548
549 sc = device_lookup(&mt_cd, MTUNIT(bp->b_dev));
550
551 DPRINTF(MDB_ANY, ("%s strategy", sc->sc_dev.dv_xname));
552
553 if ((bp->b_flags & (B_CMD | B_READ)) == 0) {
554 #define WRITE_BITS_IGNORED 8
555 #if 0
556 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) {
557 tprintf(sc->sc_ttyp,
558 "%s: write record must be multiple of %d\n",
559 sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED);
560 goto error;
561 }
562 #endif
563 s = 16 * 1024;
564 if (sc->sc_stat2 & SR2_LONGREC) {
565 switch (sc->sc_density) {
566 case T_1600BPI:
567 s = 32 * 1024;
568 break;
569
570 case T_6250BPI:
571 case T_BADBPI:
572 s = 60 * 1024;
573 break;
574 }
575 }
576 if (bp->b_bcount > s) {
577 tprintf(sc->sc_ttyp,
578 "%s: write record (%ld) too big: limit (%d)\n",
579 sc->sc_dev.dv_xname, bp->b_bcount, s);
580 #if 0 /* XXX see above */
581 error:
582 #endif
583 bp->b_flags |= B_ERROR;
584 bp->b_error = EIO;
585 biodone(bp);
586 return;
587 }
588 }
589 s = splbio();
590 BUFQ_PUT(&sc->sc_tab, bp);
591 if (sc->sc_active == 0) {
592 sc->sc_active = 1;
593 mtustart(sc);
594 }
595 splx(s);
596 }
597
598 void
599 mtustart(sc)
600 struct mt_softc *sc;
601 {
602
603 DPRINTF(MDB_ANY, ("%s ustart", sc->sc_dev.dv_xname));
604 if (gpibrequest(sc->sc_ic, sc->sc_hdl))
605 mtstart(sc);
606 }
607
608 void
609 mtcallback(v, action)
610 void *v;
611 int action;
612 {
613 struct mt_softc *sc = v;
614
615 DPRINTF(MDB_FOLLOW, ("mtcallback: v=%p, action=%d\n", v, action));
616
617 switch (action) {
618 case GPIBCBF_START:
619 mtstart(sc);
620 break;
621 case GPIBCBF_INTR:
622 mtintr(sc);
623 break;
624 #ifdef DEBUG
625 default:
626 printf("mtcallback: unknown action %d\n", action);
627 break;
628 #endif
629 }
630 }
631
632 void
633 mtintr_callout(arg)
634 void *arg;
635 {
636 struct mt_softc *sc = arg;
637 int s = splbio();
638
639 gpibppclear(sc->sc_ic);
640 mtintr(sc);
641 splx(s);
642 }
643
644 void
645 mtstart_callout(arg)
646 void *arg;
647 {
648 int s = splbio();
649
650 mtstart((struct mt_softc *)arg);
651 splx(s);
652 }
653
654 void
655 mtstart(sc)
656 struct mt_softc *sc;
657 {
658 struct buf *bp;
659 short cmdcount = 1;
660 u_char cmdbuf[2];
661
662 DPRINTF(MDB_ANY, ("%s start", sc->sc_dev.dv_xname));
663 sc->sc_flags &= ~MTF_WRT;
664 bp = BUFQ_PEEK(&sc->sc_tab);
665 if ((sc->sc_flags & MTF_ALIVE) == 0 &&
666 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET))
667 goto fatalerror;
668
669 if (sc->sc_flags & MTF_REW) {
670 if (!gpibpptest(sc->sc_ic, sc->sc_slave))
671 goto stillrew;
672 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) {
673 case 0:
674 case 1:
675 stillrew:
676 if ((sc->sc_stat1 & SR1_BOT) ||
677 !(sc->sc_stat1 & SR1_ONLINE)) {
678 sc->sc_flags &= ~MTF_REW;
679 break;
680 }
681 case -2:
682 /*
683 * -2 means "timeout" reading DSJ, which is probably
684 * temporary. This is considered OK when doing a NOP,
685 * but not otherwise.
686 */
687 if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) {
688 callout_reset(&sc->sc_start_ch, hz >> 5,
689 mtstart_callout, sc);
690 return;
691 }
692 case 2:
693 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) {
694 bp->b_error = EBUSY;
695 goto errdone;
696 }
697 goto done;
698
699 default:
700 goto fatalerror;
701 }
702 }
703 if (bp->b_flags & B_CMD) {
704 if (sc->sc_flags & MTF_PASTEOT) {
705 switch(bp->b_cmd) {
706 case MTFSF:
707 case MTWEOF:
708 case MTFSR:
709 bp->b_error = ENOSPC;
710 goto errdone;
711
712 case MTBSF:
713 case MTOFFL:
714 case MTBSR:
715 case MTREW:
716 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT);
717 break;
718 }
719 }
720 switch(bp->b_cmd) {
721 case MTFSF:
722 if (sc->sc_flags & MTF_HITEOF)
723 goto done;
724 cmdbuf[0] = MTTC_FSF;
725 break;
726
727 case MTBSF:
728 if (sc->sc_flags & MTF_HITBOF)
729 goto done;
730 cmdbuf[0] = MTTC_BSF;
731 break;
732
733 case MTOFFL:
734 sc->sc_flags |= MTF_REW;
735 cmdbuf[0] = MTTC_REWOFF;
736 break;
737
738 case MTWEOF:
739 cmdbuf[0] = MTTC_WFM;
740 break;
741
742 case MTBSR:
743 cmdbuf[0] = MTTC_BSR;
744 break;
745
746 case MTFSR:
747 cmdbuf[0] = MTTC_FSR;
748 break;
749
750 case MTREW:
751 sc->sc_flags |= MTF_REW;
752 cmdbuf[0] = MTTC_REW;
753 break;
754
755 case MTNOP:
756 /*
757 * NOP is supposed to set status bits.
758 * Force readdsj to do it.
759 */
760 switch (mtreaddsj(sc,
761 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) {
762 default:
763 goto done;
764
765 case -1:
766 /*
767 * If this fails, perform a device clear
768 * to fix any protocol problems and (most
769 * likely) get the status.
770 */
771 bp->b_cmd = MTRESET;
772 break;
773
774 case -2:
775 callout_reset(&sc->sc_start_ch, hz >> 5,
776 mtstart_callout, sc);
777 return;
778 }
779
780 case MTRESET:
781 /*
782 * 1) selected device clear (send with "-2" secondary)
783 * 2) set timeout, then wait for "service request"
784 * 3) interrupt will read DSJ (and END COMPLETE-IDLE)
785 */
786 if (gpibsend(sc->sc_ic, sc->sc_slave, -2, NULL, 0)){
787 printf("%s can't reset", sc->sc_dev.dv_xname);
788 goto fatalerror;
789 }
790 callout_reset(&sc->sc_intr_ch, 4*hz, mtintr_callout,
791 sc);
792 gpibawait(sc->sc_ic);
793 return;
794
795 case MTSET800BPI:
796 cmdbuf[0] = MTTC_800;
797 break;
798
799 case MTSET1600BPI:
800 cmdbuf[0] = MTTC_1600;
801 break;
802
803 case MTSET6250BPI:
804 cmdbuf[0] = MTTC_6250;
805 break;
806
807 case MTSET6250DC:
808 cmdbuf[0] = MTTC_DC6250;
809 break;
810 }
811 } else {
812 if (sc->sc_flags & MTF_PASTEOT) {
813 bp->b_error = ENOSPC;
814 goto errdone;
815 }
816 if (bp->b_flags & B_READ) {
817 sc->sc_flags |= MTF_IO;
818 cmdbuf[0] = MTTC_READ;
819 } else {
820 sc->sc_flags |= MTF_WRT | MTF_IO;
821 cmdbuf[0] = MTTC_WRITE;
822 cmdbuf[1] = (bp->b_bcount +((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED;
823 cmdcount = 2;
824 }
825 }
826 if (gpibsend(sc->sc_ic, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount)
827 == cmdcount) {
828 if (sc->sc_flags & MTF_REW)
829 goto done;
830 gpibawait(sc->sc_ic);
831 return;
832 }
833 fatalerror:
834 /*
835 * If anything fails, the drive is probably hosed, so mark it not
836 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and
837 * if, last we heard, it was REWinding, remember that).
838 */
839 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW;
840 bp->b_error = EIO;
841 errdone:
842 bp->b_flags |= B_ERROR;
843 done:
844 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
845 (void)BUFQ_GET(&sc->sc_tab);
846 biodone(bp);
847 gpibrelease(sc->sc_ic, sc->sc_hdl);
848 if ((bp = BUFQ_PEEK(&sc->sc_tab)) == NULL)
849 sc->sc_active = 0;
850 else
851 mtustart(sc);
852 }
853
854 void
855 mtintr(sc)
856 struct mt_softc *sc;
857 {
858 struct buf *bp;
859 int slave, dir, i;
860 u_char cmdbuf[4];
861
862 slave = sc->sc_slave;
863
864 bp = BUFQ_PEEK(&sc->sc_tab);
865 if (bp == NULL) {
866 printf("%s intr: bp == NULL", sc->sc_dev.dv_xname);
867 return;
868 }
869
870 DPRINTF(MDB_ANY, ("%s intr", sc->sc_dev.dv_xname));
871
872 /*
873 * Some operation completed. Read status bytes and report errors.
874 * Clear EOF flags here `cause they're set once on specific conditions
875 * below when a command succeeds.
876 * A DSJ of 2 always means keep waiting. If the command was READ
877 * (and we're in data DMA phase) stop data transfer first.
878 */
879 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
880 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ &&
881 !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){
882 cmdbuf[0] = MTE_STOP;
883 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD,cmdbuf,1);
884 }
885 switch (mtreaddsj(sc, 0)) {
886 case 0:
887 break;
888
889 case 1:
890 /*
891 * If we're in the middle of a READ/WRITE and have yet to
892 * start the data transfer, a DSJ of one should terminate it.
893 */
894 sc->sc_flags &= ~MTF_IO;
895 break;
896
897 case 2:
898 (void) gpibawait(sc->sc_ic);
899 return;
900
901 case -2:
902 /*
903 * -2 means that the drive failed to respond quickly enough
904 * to the request for DSJ. It's probably just "busy" figuring
905 * it out and will know in a little bit...
906 */
907 callout_reset(&sc->sc_intr_ch, hz >> 5, mtintr_callout, sc);
908 return;
909
910 default:
911 printf("%s intr: can't get drive stat", sc->sc_dev.dv_xname);
912 goto error;
913 }
914 if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) {
915 i = sc->sc_stat4 & SR4_ERCLMASK;
916 printf("%s: %s error, retry %d, SR2/3 %x/%x, code %d",
917 sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" :
918 (i == SR4_PROTOCOL ? "protocol" :
919 (i == SR4_SELFTEST ? "selftest" : "unknown")),
920 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2,
921 sc->sc_stat3, sc->sc_stat5);
922
923 if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET)
924 callout_stop(&sc->sc_intr_ch);
925 if (sc->sc_stat3 & SR3_POWERUP)
926 sc->sc_flags &= MTF_OPEN | MTF_EXISTS;
927 goto error;
928 }
929 /*
930 * Report and clear any soft errors.
931 */
932 if (sc->sc_stat1 & SR1_SOFTERR) {
933 printf("%s: soft error, retry %d\n", sc->sc_dev.dv_xname,
934 sc->sc_stat4 & SR4_RETRYMASK);
935 sc->sc_stat1 &= ~SR1_SOFTERR;
936 }
937 /*
938 * We've initiated a read or write, but haven't actually started to
939 * DMA the data yet. At this point, the drive's ready.
940 */
941 if (sc->sc_flags & MTF_IO) {
942 sc->sc_flags &= ~MTF_IO;
943 dir = (bp->b_flags & B_READ ? GPIB_READ : GPIB_WRITE);
944 gpibxfer(sc->sc_ic, slave,
945 dir == GPIB_READ ? MTT_READ : MTL_WRITE,
946 bp->b_data, bp->b_bcount, dir, dir == GPIB_READ);
947 return;
948 }
949 /*
950 * Check for End Of Tape - we're allowed to hit EOT and then write (or
951 * read) one more record. If we get here and have not already hit EOT,
952 * return ENOSPC to inform the process that it's hit it. If we get
953 * here and HAVE already hit EOT, don't allow any more operations that
954 * move the tape forward.
955 */
956 if (sc->sc_stat1 & SR1_EOT) {
957 if (sc->sc_flags & MTF_ATEOT)
958 sc->sc_flags |= MTF_PASTEOT;
959 else {
960 bp->b_flags |= B_ERROR;
961 bp->b_error = ENOSPC;
962 sc->sc_flags |= MTF_ATEOT;
963 }
964 }
965 /*
966 * If a motion command was being executed, check for Tape Marks.
967 * If we were doing data, make sure we got the right amount, and
968 * check for hitting tape marks on reads.
969 */
970 if (bp->b_flags & B_CMD) {
971 if (sc->sc_stat1 & SR1_EOF) {
972 if (bp->b_cmd == MTFSR)
973 sc->sc_flags |= MTF_HITEOF;
974 if (bp->b_cmd == MTBSR)
975 sc->sc_flags |= MTF_HITBOF;
976 }
977 if (bp->b_cmd == MTRESET) {
978 callout_stop(&sc->sc_intr_ch);
979 sc->sc_flags |= MTF_ALIVE;
980 }
981 } else {
982 i = gpibrecv(sc->sc_ic, slave, MTT_BCNT, cmdbuf, 2);
983 if (i != 2) {
984 printf("%s intr: can't get xfer length\n",
985 sc->sc_dev.dv_xname);
986 goto error;
987 }
988 i = (int) *((u_short *) cmdbuf);
989 if (i <= bp->b_bcount) {
990 if (i == 0)
991 sc->sc_flags |= MTF_HITEOF;
992 bp->b_resid = bp->b_bcount - i;
993 DPRINTF(MDB_ANY, ("%s intr: bcount %ld, resid %ld",
994 sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid));
995 } else {
996 tprintf(sc->sc_ttyp,
997 "%s: record (%d) larger than wanted (%ld)\n",
998 sc->sc_dev.dv_xname, i, bp->b_bcount);
999 error:
1000 sc->sc_flags &= ~MTF_IO;
1001 bp->b_error = EIO;
1002 bp->b_flags |= B_ERROR;
1003 }
1004 }
1005 /*
1006 * The operation is completely done.
1007 * Let the drive know with an END command.
1008 */
1009 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE;
1010 (void) gpibsend(sc->sc_ic, slave, MTL_ECMD, cmdbuf, 1);
1011 bp->b_flags &= ~B_CMD;
1012 (void)BUFQ_GET(&sc->sc_tab);
1013 biodone(bp);
1014 gpibrelease(sc->sc_ic, sc->sc_hdl);
1015 if (BUFQ_PEEK(&sc->sc_tab) == NULL)
1016 sc->sc_active = 0;
1017 else
1018 mtustart(sc);
1019 }
1020
1021 int
1022 mtread(dev, uio, flags)
1023 dev_t dev;
1024 struct uio *uio;
1025 int flags;
1026 {
1027 struct mt_softc *sc;
1028
1029 sc = device_lookup(&mt_cd, MTUNIT(dev));
1030
1031 return (physio(mtstrategy, &sc->sc_bufstore,
1032 dev, B_READ, minphys, uio));
1033 }
1034
1035 int
1036 mtwrite(dev, uio, flags)
1037 dev_t dev;
1038 struct uio *uio;
1039 int flags;
1040 {
1041 struct mt_softc *sc;
1042
1043 sc = device_lookup(&mt_cd, MTUNIT(dev));
1044
1045 return (physio(mtstrategy, &sc->sc_bufstore,
1046 dev, B_WRITE, minphys, uio));
1047 }
1048
1049 int
1050 mtioctl(dev, cmd, data, flag, p)
1051 dev_t dev;
1052 u_long cmd;
1053 caddr_t data;
1054 int flag;
1055 struct proc *p;
1056 {
1057 struct mtop *op;
1058 int cnt;
1059
1060 switch (cmd) {
1061 case MTIOCTOP:
1062 op = (struct mtop *)data;
1063 switch(op->mt_op) {
1064 case MTWEOF:
1065 case MTFSF:
1066 case MTBSR:
1067 case MTBSF:
1068 case MTFSR:
1069 cnt = op->mt_count;
1070 break;
1071
1072 case MTOFFL:
1073 case MTREW:
1074 case MTNOP:
1075 cnt = 0;
1076 break;
1077
1078 default:
1079 return (EINVAL);
1080 }
1081 return (mtcommand(dev, op->mt_op, cnt));
1082
1083 case MTIOCGET:
1084 break;
1085
1086 default:
1087 return (EINVAL);
1088 }
1089 return (0);
1090 }
Cache object: eced6cc52dbfb370e6f09f990472d75b
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