1 /* $NetBSD: mt.c,v 1.56 2022/11/26 00:25:36 tsutsui Exp $ */
2
3 /*-
4 * Copyright (c) 1996, 1997 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) 1992, The University of Utah and
34 * the Computer Systems Laboratory at the University of Utah (CSL).
35 * All rights reserved.
36 *
37 * Permission to use, copy, modify and distribute this software is hereby
38 * granted provided that (1) source code retains these copyright, permission,
39 * and disclaimer notices, and (2) redistributions including binaries
40 * reproduce the notices in supporting documentation, and (3) all advertising
41 * materials mentioning features or use of this software display the following
42 * acknowledgement: ``This product includes software developed by the
43 * Computer Systems Laboratory at the University of Utah.''
44 *
45 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
46 * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
47 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
48 *
49 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
50 * improvements that they make and grant CSL redistribution rights.
51 *
52 * Utah $Hdr: mt.c 1.8 95/09/12$
53 */
54 /* @(#)mt.c 3.9 90/07/10 mt Xinu
55 *
56 * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc)
57 * Original version contributed by Mt. Xinu.
58 * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of
59 * Computer Science, Victoria University of Wellington
60 */
61
62 #include <sys/cdefs.h>
63 __KERNEL_RCSID(0, "$NetBSD: mt.c,v 1.56 2022/11/26 00:25:36 tsutsui Exp $");
64
65 #include <sys/param.h>
66 #include <sys/systm.h>
67 #include <sys/callout.h>
68 #include <sys/buf.h>
69 #include <sys/bufq.h>
70 #include <sys/ioctl.h>
71 #include <sys/mtio.h>
72 #include <sys/file.h>
73 #include <sys/proc.h>
74 #include <sys/errno.h>
75 #include <sys/syslog.h>
76 #include <sys/tty.h>
77 #include <sys/kernel.h>
78 #include <sys/tprintf.h>
79 #include <sys/device.h>
80 #include <sys/conf.h>
81
82 #include <hp300/dev/hpibvar.h>
83
84 #include <hp300/dev/mtreg.h>
85
86 #include "ioconf.h"
87
88 static const struct mtinfo {
89 uint16_t hwid;
90 const char *desc;
91 } mtinfo[] = {
92 { MT7978ID, "7978" },
93 { MT7979AID, "7979A" },
94 { MT7980ID, "7980" },
95 { MT7974AID, "7974A" },
96 };
97 static const int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]);
98
99 struct mt_softc {
100 device_t sc_dev;
101 struct callout sc_start_ch;
102 struct callout sc_intr_ch;
103 int sc_hpibno; /* logical HPIB this slave it attached to */
104 int sc_slave; /* HPIB slave address (0-6) */
105 short sc_flags; /* see below */
106 uint8_t sc_lastdsj; /* place for DSJ in mtreaddsj() */
107 uint8_t sc_lastecmd; /* place for End Command in mtreaddsj() */
108 short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */
109 short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */
110 struct mt_stat sc_stat;/* status bytes last read from device */
111 short sc_density; /* current density of tape (mtio.h format) */
112 short sc_type; /* tape drive model (hardware IDs) */
113 struct hpibqueue sc_hq; /* HPIB device queue member */
114 tpr_t sc_ttyp;
115 struct bufq_state *sc_tab;/* buf queue */
116 int sc_active;
117 };
118
119 #ifdef DEBUG
120 int mtdebug = 0;
121 #define dlog if (mtdebug) log
122 #else
123 #define dlog if (0) log
124 #endif
125
126 #define UNIT(x) (minor(x) & 3)
127
128 #define B_CMD B_DEVPRIVATE /* command buf instead of data */
129 #define b_cmd b_blkno /* blkno holds cmd when B_CMD */
130
131 static int mtmatch(device_t, cfdata_t, void *);
132 static void mtattach(device_t, device_t, void *);
133
134 CFATTACH_DECL_NEW(mt, sizeof(struct mt_softc),
135 mtmatch, mtattach, NULL, NULL);
136
137 static dev_type_open(mtopen);
138 static dev_type_close(mtclose);
139 static dev_type_read(mtread);
140 static dev_type_write(mtwrite);
141 static dev_type_ioctl(mtioctl);
142 static dev_type_strategy(mtstrategy);
143
144 const struct bdevsw mt_bdevsw = {
145 .d_open = mtopen,
146 .d_close = mtclose,
147 .d_strategy = mtstrategy,
148 .d_ioctl = mtioctl,
149 .d_dump = nodump,
150 .d_psize = nosize,
151 .d_discard = nodiscard,
152 .d_flag = D_TAPE
153 };
154
155 const struct cdevsw mt_cdevsw = {
156 .d_open = mtopen,
157 .d_close = mtclose,
158 .d_read = mtread,
159 .d_write = mtwrite,
160 .d_ioctl = mtioctl,
161 .d_stop = nostop,
162 .d_tty = notty,
163 .d_poll = nopoll,
164 .d_mmap = nommap,
165 .d_kqfilter = nokqfilter,
166 .d_discard = nodiscard,
167 .d_flag = D_TAPE
168 };
169
170 static int mtident(struct mt_softc *, struct hpibbus_attach_args *);
171 static void mtustart(struct mt_softc *);
172 static int mtreaddsj(struct mt_softc *, int);
173 static int mtcommand(dev_t, int, int);
174 static void spl_mtintr(void *);
175 static void spl_mtstart(void *);
176
177 static void mtstart(void *);
178 static void mtgo(void *);
179 static void mtintr(void *);
180
181 static int
mtmatch(device_t parent,cfdata_t cf,void * aux)182 mtmatch(device_t parent, cfdata_t cf, void *aux)
183 {
184 struct hpibbus_attach_args *ha = aux;
185
186 return mtident(NULL, ha);
187 }
188
189 static void
mtattach(device_t parent,device_t self,void * aux)190 mtattach(device_t parent, device_t self, void *aux)
191 {
192 struct mt_softc *sc = device_private(self);
193 struct hpibbus_attach_args *ha = aux;
194 int hpibno, slave;
195
196 sc->sc_dev = self;
197 if (mtident(sc, ha) == 0) {
198 aprint_error(": impossible!\n");
199 return;
200 }
201
202 hpibno = device_unit(parent);
203 slave = ha->ha_slave;
204
205 bufq_alloc(&sc->sc_tab, "fcfs", 0);
206 callout_init(&sc->sc_start_ch, 0);
207 callout_init(&sc->sc_intr_ch, 0);
208
209 sc->sc_hpibno = hpibno;
210 sc->sc_slave = slave;
211 sc->sc_flags = MTF_EXISTS;
212
213 /* Initialize hpib job queue entry. */
214 sc->sc_hq.hq_softc = sc;
215 sc->sc_hq.hq_slave = sc->sc_slave;
216 sc->sc_hq.hq_start = mtstart;
217 sc->sc_hq.hq_go = mtgo;
218 sc->sc_hq.hq_intr = mtintr;
219 }
220
221 static int
mtident(struct mt_softc * sc,struct hpibbus_attach_args * ha)222 mtident(struct mt_softc *sc, struct hpibbus_attach_args *ha)
223 {
224 int i;
225
226 for (i = 0; i < nmtinfo; i++) {
227 if (ha->ha_id == mtinfo[i].hwid &&
228 ha->ha_punit == 0) {
229 if (sc != NULL) {
230 sc->sc_type = mtinfo[i].hwid;
231 aprint_normal(": %s tape\n", mtinfo[i].desc);
232 }
233 return 1;
234 }
235 }
236 return 0;
237 }
238
239 /*
240 * Perform a read of "Device Status Jump" register and update the
241 * status if necessary. If status is read, the given "ecmd" is also
242 * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure
243 * and -2 on "temporary" failure.
244 */
245 static int
mtreaddsj(struct mt_softc * sc,int ecmd)246 mtreaddsj(struct mt_softc *sc, int ecmd)
247 {
248 int retval;
249
250 if ((sc->sc_flags & MTF_STATTIMEO) != 0)
251 goto getstats;
252 retval = hpibrecv(sc->sc_hpibno,
253 (sc->sc_flags & MTF_DSJTIMEO) != 0 ? -1 : sc->sc_slave,
254 MTT_DSJ, &(sc->sc_lastdsj), 1);
255 sc->sc_flags &= ~MTF_DSJTIMEO;
256 if (retval != 1) {
257 dlog(LOG_DEBUG, "%s can't hpibrecv DSJ",
258 device_xname(sc->sc_dev));
259 if (sc->sc_recvtimeo == 0)
260 sc->sc_recvtimeo = hz;
261 if (--sc->sc_recvtimeo == 0)
262 return -1;
263 if (retval == 0)
264 sc->sc_flags |= MTF_DSJTIMEO;
265 return -2;
266 }
267 sc->sc_recvtimeo = 0;
268 sc->sc_statindex = 0;
269 dlog(LOG_DEBUG, "%s readdsj: 0x%x", device_xname(sc->sc_dev),
270 sc->sc_lastdsj);
271 sc->sc_lastecmd = ecmd;
272 switch (sc->sc_lastdsj) {
273 case 0:
274 if (ecmd & MTE_DSJ_FORCE)
275 break;
276 return 0;
277
278 case 2:
279 sc->sc_lastecmd = MTE_COMPLETE;
280 case 1:
281 break;
282
283 default:
284 log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", device_xname(sc->sc_dev),
285 sc->sc_lastdsj);
286 return -1;
287 }
288 getstats:
289 retval = hpibrecv(sc->sc_hpibno,
290 (sc->sc_flags & MTF_STATCONT) != 0 ? -1 : sc->sc_slave,
291 MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex,
292 sizeof(sc->sc_stat) - sc->sc_statindex);
293 sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT);
294 if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) {
295 if (sc->sc_recvtimeo == 0)
296 sc->sc_recvtimeo = hz;
297 if (--sc->sc_recvtimeo != 0) {
298 if (retval >= 0) {
299 sc->sc_statindex += retval;
300 sc->sc_flags |= MTF_STATCONT;
301 }
302 sc->sc_flags |= MTF_STATTIMEO;
303 return -2;
304 }
305 log(LOG_ERR, "%s readdsj: can't read status",
306 device_xname(sc->sc_dev));
307 return -1;
308 }
309 sc->sc_recvtimeo = 0;
310 sc->sc_statindex = 0;
311 dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x",
312 device_xname(sc->sc_dev),
313 sc->sc_stat1, sc->sc_stat2, sc->sc_stat3,
314 sc->sc_stat4, sc->sc_stat5, sc->sc_stat6);
315 if (sc->sc_lastecmd != 0)
316 (void) hpibsend(sc->sc_hpibno, sc->sc_slave,
317 MTL_ECMD, &sc->sc_lastecmd, 1);
318 return (int)sc->sc_lastdsj;
319 }
320
321 static int
mtopen(dev_t dev,int flag,int mode,struct lwp * l)322 mtopen(dev_t dev, int flag, int mode, struct lwp *l)
323 {
324 struct mt_softc *sc;
325 int req_den;
326 int error;
327
328 sc = device_lookup_private(&mt_cd, UNIT(dev));
329 if (sc == NULL)
330 return ENXIO;
331
332 if ((sc->sc_flags & MTF_EXISTS) == 0)
333 return ENXIO;
334
335 dlog(LOG_DEBUG, "%s open: flags 0x%x", device_xname(sc->sc_dev),
336 sc->sc_flags);
337 if ((sc->sc_flags & MTF_OPEN) != 0)
338 return EBUSY;
339 sc->sc_flags |= MTF_OPEN;
340 sc->sc_ttyp = tprintf_open(l->l_proc);
341 if ((sc->sc_flags & MTF_ALIVE) == 0) {
342 error = mtcommand(dev, MTRESET, 0);
343 if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0)
344 goto errout;
345 if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE)
346 (void) mtcommand(dev, MTREW, 0);
347 }
348 for (;;) {
349 if ((error = mtcommand(dev, MTNOP, 0)) != 0)
350 goto errout;
351 if ((sc->sc_flags & MTF_REW) == 0)
352 break;
353 error = kpause("mt", true, hz, NULL);
354 if (error != 0 && error != EWOULDBLOCK) {
355 error = EINTR;
356 goto errout;
357 }
358 }
359 if ((flag & FWRITE) != 0 && (sc->sc_stat1 & SR1_RO) != 0) {
360 error = EROFS;
361 goto errout;
362 }
363 if ((sc->sc_stat1 & SR1_ONLINE) == 0) {
364 uprintf("%s: not online\n", device_xname(sc->sc_dev));
365 error = EIO;
366 goto errout;
367 }
368 /*
369 * Select density:
370 * - find out what density the drive is set to
371 * (i.e. the density of the current tape)
372 * - if we are going to write
373 * - if we're not at the beginning of the tape
374 * - complain if we want to change densities
375 * - otherwise, select the mtcommand to set the density
376 *
377 * If the drive doesn't support it then don't change the recorded
378 * density.
379 *
380 * The original MOREbsd code had these additional conditions
381 * for the mid-tape change
382 *
383 * req_den != T_BADBPI &&
384 * sc->sc_density != T_6250BPI
385 *
386 * which suggests that it would be possible to write multiple
387 * densities if req_den == T_BAD_BPI or the current tape
388 * density was 6250. Testing of our 7980 suggests that the
389 * device cannot change densities mid-tape.
390 *
391 * ajv@comp.vuw.ac.nz
392 */
393 sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : (
394 (sc->sc_stat3 & SR3_1600) ? T_1600BPI : (
395 (sc->sc_stat3 & SR3_800) ? T_800BPI : -1));
396 req_den = (dev & T_DENSEL);
397
398 if ((flag & FWRITE) != 0) {
399 if ((sc->sc_stat1 & SR1_BOT) == 0) {
400 if (sc->sc_density != req_den) {
401 uprintf("%s: can't change density mid-tape\n",
402 device_xname(sc->sc_dev));
403 error = EIO;
404 goto errout;
405 }
406 } else {
407 int mtset_density =
408 (req_den == T_800BPI ? MTSET800BPI : (
409 req_den == T_1600BPI ? MTSET1600BPI : (
410 req_den == T_6250BPI ? MTSET6250BPI : (
411 sc->sc_type == MT7980ID
412 ? MTSET6250DC
413 : MTSET6250BPI))));
414 if (mtcommand(dev, mtset_density, 0) == 0)
415 sc->sc_density = req_den;
416 }
417 }
418 return 0;
419 errout:
420 sc->sc_flags &= ~MTF_OPEN;
421 return error;
422 }
423
424 static int
mtclose(dev_t dev,int flag,int fmt,struct lwp * l)425 mtclose(dev_t dev, int flag, int fmt, struct lwp *l)
426 {
427 struct mt_softc *sc = device_lookup_private(&mt_cd,UNIT(dev));
428
429 if ((sc->sc_flags & MTF_WRT) != 0) {
430 (void)mtcommand(dev, MTWEOF, 2);
431 (void)mtcommand(dev, MTBSF, 0);
432 }
433 if ((minor(dev) & T_NOREWIND) == 0)
434 (void)mtcommand(dev, MTREW, 0);
435 sc->sc_flags &= ~MTF_OPEN;
436 tprintf_close(sc->sc_ttyp);
437 return 0;
438 }
439
440 static int
mtcommand(dev_t dev,int cmd,int cnt)441 mtcommand(dev_t dev, int cmd, int cnt)
442 {
443 int error = 0;
444 buf_t *bp;
445
446 bp = getiobuf(NULL, true);
447 bp->b_cmd = cmd;
448 bp->b_dev = dev;
449 do {
450 bp->b_cflags = BC_BUSY;
451 bp->b_flags = B_CMD;
452 bp->b_oflags = 0;
453 mtstrategy(bp);
454 biowait(bp);
455 if (bp->b_error != 0) {
456 error = bp->b_error;
457 break;
458 }
459 } while (--cnt > 0);
460 putiobuf(bp);
461
462 return error;
463 }
464
465 /*
466 * Only thing to check here is for legal record lengths (writes only).
467 */
468 static void
mtstrategy(struct buf * bp)469 mtstrategy(struct buf *bp)
470 {
471 struct mt_softc *sc;
472 int s;
473
474 sc = device_lookup_private(&mt_cd,UNIT(bp->b_dev));
475 dlog(LOG_DEBUG, "%s strategy", device_xname(sc->sc_dev));
476 if ((bp->b_flags & (B_CMD | B_READ)) == 0) {
477 #define WRITE_BITS_IGNORED 8
478 #if 0
479 if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) {
480 tprintf(sc->sc_ttyp,
481 "%s: write record must be multiple of %d\n",
482 device_xname(sc->sc_dev), 1 << WRITE_BITS_IGNORED);
483 goto error;
484 }
485 #endif
486 s = 16 * 1024;
487 if ((sc->sc_stat2 & SR2_LONGREC) != 0) {
488 switch (sc->sc_density) {
489 case T_1600BPI:
490 s = 32 * 1024;
491 break;
492
493 case T_6250BPI:
494 case T_BADBPI:
495 s = 60 * 1024;
496 break;
497 }
498 }
499 if (bp->b_bcount > s) {
500 tprintf(sc->sc_ttyp,
501 "%s: write record (%d) too big: limit (%d)\n",
502 device_xname(sc->sc_dev), bp->b_bcount, s);
503 #if 0 /* XXX see above */
504 error:
505 #endif
506 bp->b_error = EIO;
507 biodone(bp);
508 return;
509 }
510 }
511 s = splbio();
512 bufq_put(sc->sc_tab, bp);
513 if (sc->sc_active == 0) {
514 sc->sc_active = 1;
515 mtustart(sc);
516 }
517 splx(s);
518 }
519
520 static void
mtustart(struct mt_softc * sc)521 mtustart(struct mt_softc *sc)
522 {
523
524 dlog(LOG_DEBUG, "%s ustart", device_xname(sc->sc_dev));
525 if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq))
526 mtstart(sc);
527 }
528
529 static void
spl_mtintr(void * arg)530 spl_mtintr(void *arg)
531 {
532 struct mt_softc *sc = arg;
533 int s = splbio();
534
535 hpibppclear(sc->sc_hpibno);
536 mtintr(sc);
537 splx(s);
538 }
539
540 static void
spl_mtstart(void * arg)541 spl_mtstart(void *arg)
542 {
543 int s = splbio();
544
545 mtstart(arg);
546 splx(s);
547 }
548
549 static void
mtstart(void * arg)550 mtstart(void *arg)
551 {
552 struct mt_softc *sc = arg;
553 struct buf *bp;
554 short cmdcount = 1;
555 uint8_t cmdbuf[2];
556
557 dlog(LOG_DEBUG, "%s start", device_xname(sc->sc_dev));
558 sc->sc_flags &= ~MTF_WRT;
559 bp = bufq_peek(sc->sc_tab);
560 if ((sc->sc_flags & MTF_ALIVE) == 0 &&
561 ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET))
562 goto fatalerror;
563
564 if ((sc->sc_flags & MTF_REW) != 0) {
565 if (!hpibpptest(sc->sc_hpibno, sc->sc_slave))
566 goto stillrew;
567 switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) {
568 case 0:
569 case 1:
570 stillrew:
571 if ((sc->sc_stat1 & SR1_BOT) != 0 ||
572 (sc->sc_stat1 & SR1_ONLINE) == 0) {
573 sc->sc_flags &= ~MTF_REW;
574 break;
575 }
576 case -2:
577 /*
578 * -2 means "timeout" reading DSJ, which is probably
579 * temporary. This is considered OK when doing a NOP,
580 * but not otherwise.
581 */
582 if ((sc->sc_flags &
583 (MTF_DSJTIMEO | MTF_STATTIMEO)) != 0) {
584 callout_reset(&sc->sc_start_ch, hz >> 5,
585 spl_mtstart, sc);
586 return;
587 }
588 case 2:
589 if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) {
590 bp->b_error = EBUSY;
591 goto done;
592 }
593 goto done;
594
595 default:
596 goto fatalerror;
597 }
598 }
599 if ((bp->b_flags & B_CMD) != 0) {
600 if ((sc->sc_flags & MTF_PASTEOT) != 0) {
601 switch(bp->b_cmd) {
602 case MTFSF:
603 case MTWEOF:
604 case MTFSR:
605 bp->b_error = ENOSPC;
606 goto done;
607
608 case MTBSF:
609 case MTOFFL:
610 case MTBSR:
611 case MTREW:
612 sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT);
613 break;
614 }
615 }
616 switch(bp->b_cmd) {
617 case MTFSF:
618 if ((sc->sc_flags & MTF_HITEOF) != 0)
619 goto done;
620 cmdbuf[0] = MTTC_FSF;
621 break;
622
623 case MTBSF:
624 if ((sc->sc_flags & MTF_HITBOF) != 0)
625 goto done;
626 cmdbuf[0] = MTTC_BSF;
627 break;
628
629 case MTOFFL:
630 sc->sc_flags |= MTF_REW;
631 cmdbuf[0] = MTTC_REWOFF;
632 break;
633
634 case MTWEOF:
635 cmdbuf[0] = MTTC_WFM;
636 break;
637
638 case MTBSR:
639 cmdbuf[0] = MTTC_BSR;
640 break;
641
642 case MTFSR:
643 cmdbuf[0] = MTTC_FSR;
644 break;
645
646 case MTREW:
647 sc->sc_flags |= MTF_REW;
648 cmdbuf[0] = MTTC_REW;
649 break;
650
651 case MTNOP:
652 /*
653 * NOP is supposed to set status bits.
654 * Force readdsj to do it.
655 */
656 switch (mtreaddsj(sc,
657 MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) {
658 default:
659 goto done;
660
661 case -1:
662 /*
663 * If this fails, perform a device clear
664 * to fix any protocol problems and (most
665 * likely) get the status.
666 */
667 bp->b_cmd = MTRESET;
668 break;
669
670 case -2:
671 callout_reset(&sc->sc_start_ch, hz >> 5,
672 spl_mtstart, sc);
673 return;
674 }
675
676 case MTRESET:
677 /*
678 * 1) selected device clear (send with "-2" secondary)
679 * 2) set timeout, then wait for "service request"
680 * 3) interrupt will read DSJ (and END COMPLETE-IDLE)
681 */
682 if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2,
683 NULL, 0)) {
684 log(LOG_ERR, "%s can't reset",
685 device_xname(sc->sc_dev));
686 goto fatalerror;
687 }
688 callout_reset(&sc->sc_intr_ch, 4 * hz, spl_mtintr, sc);
689 hpibawait(sc->sc_hpibno);
690 return;
691
692 case MTSET800BPI:
693 cmdbuf[0] = MTTC_800;
694 break;
695
696 case MTSET1600BPI:
697 cmdbuf[0] = MTTC_1600;
698 break;
699
700 case MTSET6250BPI:
701 cmdbuf[0] = MTTC_6250;
702 break;
703
704 case MTSET6250DC:
705 cmdbuf[0] = MTTC_DC6250;
706 break;
707 }
708 } else {
709 if ((sc->sc_flags & MTF_PASTEOT) != 0) {
710 bp->b_error = ENOSPC;
711 goto done;
712 }
713 if ((bp->b_flags & B_READ) != 0) {
714 sc->sc_flags |= MTF_IO;
715 cmdbuf[0] = MTTC_READ;
716 } else {
717 sc->sc_flags |= MTF_WRT | MTF_IO;
718 cmdbuf[0] = MTTC_WRITE;
719 cmdbuf[1] =
720 (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1))
721 >> WRITE_BITS_IGNORED;
722 cmdcount = 2;
723 }
724 }
725 if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount)
726 == cmdcount) {
727 if ((sc->sc_flags & MTF_REW) != 0)
728 goto done;
729 hpibawait(sc->sc_hpibno);
730 return;
731 }
732 fatalerror:
733 /*
734 * If anything fails, the drive is probably hosed, so mark it not
735 * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and
736 * if, last we heard, it was REWinding, remember that).
737 */
738 sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW;
739 bp->b_error = EIO;
740 done:
741 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
742 (void)bufq_get(sc->sc_tab);
743 biodone(bp);
744 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
745 if ((bp = bufq_peek(sc->sc_tab)) == NULL)
746 sc->sc_active = 0;
747 else
748 mtustart(sc);
749 }
750
751 /*
752 * The Utah code had a bug which meant that the driver was unable to read.
753 * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized.
754 * -- ajv@comp.vuw.ac.nz
755 */
756 static void
mtgo(void * arg)757 mtgo(void *arg)
758 {
759 struct mt_softc *sc = arg;
760 struct buf *bp;
761 int rw;
762
763 dlog(LOG_DEBUG, "%s go", device_xname(sc->sc_dev));
764 bp = bufq_peek(sc->sc_tab);
765 rw = bp->b_flags & B_READ;
766 hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE,
767 bp->b_data, bp->b_bcount, rw, rw != 0);
768 }
769
770 static void
mtintr(void * arg)771 mtintr(void *arg)
772 {
773 struct mt_softc *sc = arg;
774 struct buf *bp;
775 int i;
776 uint8_t cmdbuf[4];
777
778 bp = bufq_peek(sc->sc_tab);
779 if (bp == NULL) {
780 log(LOG_ERR, "%s intr: bp == NULL", device_xname(sc->sc_dev));
781 return;
782 }
783
784 dlog(LOG_DEBUG, "%s intr", device_xname(sc->sc_dev));
785
786 /*
787 * Some operation completed. Read status bytes and report errors.
788 * Clear EOF flags here `cause they're set once on specific conditions
789 * below when a command succeeds.
790 * A DSJ of 2 always means keep waiting. If the command was READ
791 * (and we're in data DMA phase) stop data transfer first.
792 */
793 sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
794 if ((bp->b_flags & (B_CMD|B_READ)) == B_READ &&
795 (sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO)) == 0){
796 cmdbuf[0] = MTE_STOP;
797 (void)hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf, 1);
798 }
799 switch (mtreaddsj(sc, 0)) {
800 case 0:
801 break;
802
803 case 1:
804 /*
805 * If we're in the middle of a READ/WRITE and have yet to
806 * start the data transfer, a DSJ of one should terminate it.
807 */
808 sc->sc_flags &= ~MTF_IO;
809 break;
810
811 case 2:
812 (void)hpibawait(sc->sc_hpibno);
813 return;
814
815 case -2:
816 /*
817 * -2 means that the drive failed to respond quickly enough
818 * to the request for DSJ. It's probably just "busy" figuring
819 * it out and will know in a little bit...
820 */
821 callout_reset(&sc->sc_intr_ch, hz >> 5, spl_mtintr, sc);
822 return;
823
824 default:
825 log(LOG_ERR, "%s intr: can't get drive stat",
826 device_xname(sc->sc_dev));
827 goto error;
828 }
829 if ((sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) != 0) {
830 i = sc->sc_stat4 & SR4_ERCLMASK;
831 log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d",
832 device_xname(sc->sc_dev), i == SR4_DEVICE ? "device" :
833 (i == SR4_PROTOCOL ? "protocol" :
834 (i == SR4_SELFTEST ? "selftest" : "unknown")),
835 sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2,
836 sc->sc_stat3, sc->sc_stat5);
837
838 if ((bp->b_flags & B_CMD) != 0 && bp->b_cmd == MTRESET)
839 callout_stop(&sc->sc_intr_ch);
840 if ((sc->sc_stat3 & SR3_POWERUP) != 0)
841 sc->sc_flags &= MTF_OPEN | MTF_EXISTS;
842 goto error;
843 }
844 /*
845 * Report and clear any soft errors.
846 */
847 if ((sc->sc_stat1 & SR1_SOFTERR) != 0) {
848 log(LOG_WARNING, "%s: soft error, retry %d\n",
849 device_xname(sc->sc_dev), sc->sc_stat4 & SR4_RETRYMASK);
850 sc->sc_stat1 &= ~SR1_SOFTERR;
851 }
852 /*
853 * We've initiated a read or write, but haven't actually started to
854 * DMA the data yet. At this point, the drive's ready.
855 */
856 if ((sc->sc_flags & MTF_IO) != 0) {
857 sc->sc_flags &= ~MTF_IO;
858 if (hpibustart(sc->sc_hpibno))
859 mtgo(sc);
860 return;
861 }
862 /*
863 * Check for End Of Tape - we're allowed to hit EOT and then write (or
864 * read) one more record. If we get here and have not already hit EOT,
865 * return ENOSPC to inform the process that it's hit it. If we get
866 * here and HAVE already hit EOT, don't allow any more operations that
867 * move the tape forward.
868 */
869 if ((sc->sc_stat1 & SR1_EOT) != 0) {
870 if ((sc->sc_flags & MTF_ATEOT) != 0)
871 sc->sc_flags |= MTF_PASTEOT;
872 else {
873 bp->b_error = ENOSPC;
874 sc->sc_flags |= MTF_ATEOT;
875 }
876 }
877 /*
878 * If a motion command was being executed, check for Tape Marks.
879 * If we were doing data, make sure we got the right amount, and
880 * check for hitting tape marks on reads.
881 */
882 if ((bp->b_flags & B_CMD) != 0) {
883 if ((sc->sc_stat1 & SR1_EOF) != 0) {
884 if (bp->b_cmd == MTFSR)
885 sc->sc_flags |= MTF_HITEOF;
886 if (bp->b_cmd == MTBSR)
887 sc->sc_flags |= MTF_HITBOF;
888 }
889 if (bp->b_cmd == MTRESET) {
890 callout_stop(&sc->sc_intr_ch);
891 sc->sc_flags |= MTF_ALIVE;
892 }
893 } else {
894 i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2);
895 if (i != 2) {
896 log(LOG_ERR, "%s intr: can't get xfer length\n",
897 device_xname(sc->sc_dev));
898 goto error;
899 }
900 i = (int)*((uint16_t *)cmdbuf);
901 if (i <= bp->b_bcount) {
902 if (i == 0)
903 sc->sc_flags |= MTF_HITEOF;
904 bp->b_resid = bp->b_bcount - i;
905 dlog(LOG_DEBUG, "%s intr: bcount %d, resid %d",
906 device_xname(sc->sc_dev), bp->b_bcount,
907 bp->b_resid);
908 } else {
909 tprintf(sc->sc_ttyp,
910 "%s: record (%d) larger than wanted (%d)\n",
911 device_xname(sc->sc_dev), i, bp->b_bcount);
912 error:
913 sc->sc_flags &= ~MTF_IO;
914 bp->b_error = EIO;
915 }
916 }
917 /*
918 * The operation is completely done.
919 * Let the drive know with an END command.
920 */
921 cmdbuf[0] = MTE_COMPLETE | MTE_IDLE;
922 (void)hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1);
923 bp->b_flags &= ~B_CMD;
924 (void)bufq_get(sc->sc_tab);
925 biodone(bp);
926 hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
927 if (bufq_peek(sc->sc_tab) == NULL)
928 sc->sc_active = 0;
929 else
930 mtustart(sc);
931 }
932
933 static int
mtread(dev_t dev,struct uio * uio,int flags)934 mtread(dev_t dev, struct uio *uio, int flags)
935 {
936
937 return physio(mtstrategy, NULL, dev, B_READ, minphys, uio);
938 }
939
940 static int
mtwrite(dev_t dev,struct uio * uio,int flags)941 mtwrite(dev_t dev, struct uio *uio, int flags)
942 {
943
944 return physio(mtstrategy, NULL, dev, B_WRITE, minphys, uio);
945 }
946
947 static int
mtioctl(dev_t dev,u_long cmd,void * data,int flag,struct lwp * l)948 mtioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
949 {
950 struct mtop *op;
951 int cnt;
952
953 switch (cmd) {
954 case MTIOCTOP:
955 op = (struct mtop *)data;
956 switch(op->mt_op) {
957 case MTWEOF:
958 case MTFSF:
959 case MTBSR:
960 case MTBSF:
961 case MTFSR:
962 cnt = op->mt_count;
963 break;
964
965 case MTOFFL:
966 case MTREW:
967 case MTNOP:
968 cnt = 0;
969 break;
970
971 default:
972 return EINVAL;
973 }
974 return mtcommand(dev, op->mt_op, cnt);
975
976 case MTIOCGET:
977 break;
978
979 default:
980 return EINVAL;
981 }
982 return 0;
983 }
984