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1.1 nbrk 1: /* $OpenBSD: mt.c,v 1.18 2007/06/06 17:15:11 deraadt Exp $ */
2: /* $NetBSD: mt.c,v 1.8 1997/03/31 07:37:29 scottr Exp $ */
3:
4: /*
5: * Copyright (c) 1996, 1997 Jason R. Thorpe. All rights reserved.
6: * Copyright (c) 1992, The University of Utah and
7: * the Computer Systems Laboratory at the University of Utah (CSL).
8: * All rights reserved.
9: *
10: * Permission to use, copy, modify and distribute this software is hereby
11: * granted provided that (1) source code retains these copyright, permission,
12: * and disclaimer notices, and (2) redistributions including binaries
13: * reproduce the notices in supporting documentation, and (3) all advertising
14: * materials mentioning features or use of this software display the following
15: * acknowledgement: ``This product includes software developed by the
16: * Computer Systems Laboratory at the University of Utah.''
17: *
18: * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
19: * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
20: * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
21: *
22: * CSL requests users of this software to return to csl-dist@cs.utah.edu any
23: * improvements that they make and grant CSL redistribution rights.
24: *
25: * Utah $Hdr: mt.c 1.8 95/09/12$
26: */
27: /* @(#)mt.c 3.9 90/07/10 mt Xinu
28: *
29: * Magnetic tape driver (7974a, 7978a/b, 7979a, 7980a, 7980xc)
30: * Original version contributed by Mt. Xinu.
31: * Modified for 4.4BSD by Mark Davies and Andrew Vignaux, Department of
32: * Computer Science, Victoria University of Wellington
33: */
34:
35: #include <sys/param.h>
36: #include <sys/systm.h>
37: #include <sys/buf.h>
38: #include <sys/ioctl.h>
39: #include <sys/mtio.h>
40: #include <sys/file.h>
41: #include <sys/proc.h>
42: #include <sys/errno.h>
43: #include <sys/syslog.h>
44: #include <sys/tty.h>
45: #include <sys/kernel.h>
46: #include <sys/device.h>
47: #include <sys/conf.h>
48:
49: #include <hp300/dev/hpibvar.h>
50:
51: #include <hp300/dev/mtreg.h>
52:
53: struct mtinfo {
54: u_short hwid;
55: char *desc;
56: } mtinfo[] = {
57: { MT7978ID, "7978" },
58: { MT7979AID, "7979A" },
59: { MT7980ID, "7980" },
60: { MT7974AID, "7974A" },
61: };
62: int nmtinfo = sizeof(mtinfo) / sizeof(mtinfo[0]);
63:
64: struct mt_softc {
65: struct device sc_dev;
66: int sc_hpibno; /* logical HPIB this slave it attached to */
67: int sc_slave; /* HPIB slave address (0-6) */
68: short sc_flags; /* see below */
69: u_char sc_lastdsj; /* place for DSJ in mtreaddsj() */
70: u_char sc_lastecmd; /* place for End Command in mtreaddsj() */
71: short sc_recvtimeo; /* count of hpibsend timeouts to prevent hang */
72: short sc_statindex; /* index for next sc_stat when MTF_STATTIMEO */
73: struct mt_stat sc_stat;/* status bytes last read from device */
74: short sc_density; /* current density of tape (mtio.h format) */
75: short sc_type; /* tape drive model (hardware IDs) */
76: struct hpibqueue sc_hq; /* HPIB device queue member */
77: struct buf sc_tab; /* buf queue */
78: struct buf sc_bufstore; /* XXX buffer storage */
79: struct timeout sc_start_to; /* spl_mtstart timeout */
80: struct timeout sc_intr_to; /* spl_mtintr timeout */
81: };
82:
83: #ifdef DEBUG
84: int mtdebug = 0;
85: #define dlog if (mtdebug) log
86: #else
87: #define dlog if (0) log
88: #endif
89:
90: #define UNIT(x) (minor(x) & 3)
91:
92: #define B_CMD B_XXX /* command buf instead of data */
93: #define b_cmd b_blkno /* blkno holds cmd when B_CMD */
94:
95: int mtmatch(struct device *, void *, void *);
96: void mtattach(struct device *, struct device *, void *);
97:
98: struct cfattach mt_ca = {
99: sizeof(struct mt_softc), mtmatch, mtattach
100: };
101:
102: struct cfdriver mt_cd = {
103: NULL, "mt", DV_TAPE
104: };
105:
106: int mtident(struct mt_softc *, struct hpibbus_attach_args *);
107: void mtustart(struct mt_softc *);
108: int mtreaddsj(struct mt_softc *, int);
109: int mtcommand(dev_t, int, int);
110: void spl_mtintr(void *);
111: void spl_mtstart(void *);
112:
113: void mtstart(void *);
114: void mtgo(void *);
115: void mtintr(void *);
116:
117: bdev_decl(mt);
118: cdev_decl(mt);
119:
120: int
121: mtmatch(parent, match, aux)
122: struct device *parent;
123: void *match, *aux;
124: {
125: struct hpibbus_attach_args *ha = aux;
126:
127: return (mtident(NULL, ha));
128: }
129:
130: void
131: mtattach(parent, self, aux)
132: struct device *parent, *self;
133: void *aux;
134: {
135: struct mt_softc *sc = (struct mt_softc *)self;
136: struct hpibbus_attach_args *ha = aux;
137: int unit, hpibno, slave;
138:
139: if (mtident(sc, ha) == 0) {
140: printf("\n%s: impossible!\n", sc->sc_dev.dv_xname);
141: return;
142: }
143:
144: unit = self->dv_unit;
145: hpibno = parent->dv_unit;
146: slave = ha->ha_slave;
147:
148: sc->sc_tab.b_actb = &sc->sc_tab.b_actf;
149:
150: sc->sc_hpibno = hpibno;
151: sc->sc_slave = slave;
152: sc->sc_flags = MTF_EXISTS;
153:
154: /* Initialize hpib job queue entry. */
155: sc->sc_hq.hq_softc = sc;
156: sc->sc_hq.hq_slave = sc->sc_slave;
157: sc->sc_hq.hq_start = mtstart;
158: sc->sc_hq.hq_go = mtgo;
159: sc->sc_hq.hq_intr = mtintr;
160:
161: /* Initialize timeout structures */
162: timeout_set(&sc->sc_start_to, spl_mtstart, sc);
163: timeout_set(&sc->sc_intr_to, spl_mtintr, sc);
164: }
165:
166: int
167: mtident(sc, ha)
168: struct mt_softc *sc;
169: struct hpibbus_attach_args *ha;
170: {
171: int i;
172:
173: for (i = 0; i < nmtinfo; i++) {
174: if (ha->ha_id == mtinfo[i].hwid &&
175: ha->ha_punit == 0) {
176: if (sc != NULL) {
177: sc->sc_type = mtinfo[i].hwid;
178: printf(": %s tape\n", mtinfo[i].desc);
179: }
180: return (1);
181: }
182: }
183: return (0);
184: }
185:
186: /*
187: * Perform a read of "Device Status Jump" register and update the
188: * status if necessary. If status is read, the given "ecmd" is also
189: * performed, unless "ecmd" is zero. Returns DSJ value, -1 on failure
190: * and -2 on "temporary" failure.
191: */
192: int
193: mtreaddsj(sc, ecmd)
194: struct mt_softc *sc;
195: int ecmd;
196: {
197: int retval;
198:
199: if (sc->sc_flags & MTF_STATTIMEO)
200: goto getstats;
201: retval = hpibrecv(sc->sc_hpibno,
202: (sc->sc_flags & MTF_DSJTIMEO) ? -1 : sc->sc_slave,
203: MTT_DSJ, &(sc->sc_lastdsj), 1);
204: sc->sc_flags &= ~MTF_DSJTIMEO;
205: if (retval != 1) {
206: dlog(LOG_DEBUG, "%s can't hpibrecv DSJ",
207: sc->sc_dev.dv_xname);
208: if (sc->sc_recvtimeo == 0)
209: sc->sc_recvtimeo = hz;
210: if (--sc->sc_recvtimeo == 0)
211: return (-1);
212: if (retval == 0)
213: sc->sc_flags |= MTF_DSJTIMEO;
214: return (-2);
215: }
216: sc->sc_recvtimeo = 0;
217: sc->sc_statindex = 0;
218: dlog(LOG_DEBUG, "%s readdsj: 0x%x", sc->sc_dev.dv_xname,
219: sc->sc_lastdsj);
220: sc->sc_lastecmd = ecmd;
221: switch (sc->sc_lastdsj) {
222: case 0:
223: if (ecmd & MTE_DSJ_FORCE)
224: break;
225: return (0);
226:
227: case 2:
228: sc->sc_lastecmd = MTE_COMPLETE;
229: case 1:
230: break;
231:
232: default:
233: log(LOG_ERR, "%s readdsj: DSJ 0x%x\n", sc->sc_dev.dv_xname,
234: sc->sc_lastdsj);
235: return (-1);
236: }
237: getstats:
238: retval = hpibrecv(sc->sc_hpibno,
239: (sc->sc_flags & MTF_STATCONT) ? -1 : sc->sc_slave,
240: MTT_STAT, ((char *)&(sc->sc_stat)) + sc->sc_statindex,
241: sizeof(sc->sc_stat) - sc->sc_statindex);
242: sc->sc_flags &= ~(MTF_STATTIMEO | MTF_STATCONT);
243: if (retval != sizeof(sc->sc_stat) - sc->sc_statindex) {
244: if (sc->sc_recvtimeo == 0)
245: sc->sc_recvtimeo = hz;
246: if (--sc->sc_recvtimeo != 0) {
247: if (retval >= 0) {
248: sc->sc_statindex += retval;
249: sc->sc_flags |= MTF_STATCONT;
250: }
251: sc->sc_flags |= MTF_STATTIMEO;
252: return (-2);
253: }
254: log(LOG_ERR, "%s readdsj: can't read status",
255: sc->sc_dev.dv_xname);
256: return (-1);
257: }
258: sc->sc_recvtimeo = 0;
259: sc->sc_statindex = 0;
260: dlog(LOG_DEBUG, "%s readdsj: status is %x %x %x %x %x %x",
261: sc->sc_dev.dv_xname,
262: sc->sc_stat1, sc->sc_stat2, sc->sc_stat3,
263: sc->sc_stat4, sc->sc_stat5, sc->sc_stat6);
264: if (sc->sc_lastecmd)
265: (void) hpibsend(sc->sc_hpibno, sc->sc_slave,
266: MTL_ECMD, &(sc->sc_lastecmd), 1);
267: return ((int) sc->sc_lastdsj);
268: }
269:
270: int
271: mtopen(dev, flag, mode, p)
272: dev_t dev;
273: int flag, mode;
274: struct proc *p;
275: {
276: int unit = UNIT(dev);
277: struct mt_softc *sc;
278: int req_den;
279: int error;
280:
281: if (unit >= mt_cd.cd_ndevs ||
282: (sc = mt_cd.cd_devs[unit]) == NULL ||
283: (sc->sc_flags & MTF_EXISTS) == 0)
284: return (ENXIO);
285:
286: dlog(LOG_DEBUG, "%s open: flags 0x%x", sc->sc_dev.dv_xname,
287: sc->sc_flags);
288: if (sc->sc_flags & MTF_OPEN)
289: return (EBUSY);
290: sc->sc_flags |= MTF_OPEN;
291: if ((sc->sc_flags & MTF_ALIVE) == 0) {
292: error = mtcommand(dev, MTRESET, 0);
293: if (error != 0 || (sc->sc_flags & MTF_ALIVE) == 0)
294: goto errout;
295: if ((sc->sc_stat1 & (SR1_BOT | SR1_ONLINE)) == SR1_ONLINE)
296: (void) mtcommand(dev, MTREW, 0);
297: }
298: for (;;) {
299: if ((error = mtcommand(dev, MTNOP, 0)) != 0)
300: goto errout;
301: if (!(sc->sc_flags & MTF_REW))
302: break;
303: if (tsleep((caddr_t) &lbolt, PCATCH | (PZERO + 1),
304: "mt", 0) != 0) {
305: error = EINTR;
306: goto errout;
307: }
308: }
309: if ((flag & FWRITE) && (sc->sc_stat1 & SR1_RO)) {
310: error = EROFS;
311: goto errout;
312: }
313: if (!(sc->sc_stat1 & SR1_ONLINE)) {
314: uprintf("%s: not online\n", sc->sc_dev.dv_xname);
315: error = EIO;
316: goto errout;
317: }
318: /*
319: * Select density:
320: * - find out what density the drive is set to
321: * (i.e. the density of the current tape)
322: * - if we are going to write
323: * - if we're not at the beginning of the tape
324: * - complain if we want to change densities
325: * - otherwise, select the mtcommand to set the density
326: *
327: * If the drive doesn't support it then don't change the recorded
328: * density.
329: *
330: * The original MOREbsd code had these additional conditions
331: * for the mid-tape change
332: *
333: * req_den != T_BADBPI &&
334: * sc->sc_density != T_6250BPI
335: *
336: * which suggests that it would be possible to write multiple
337: * densities if req_den == T_BAD_BPI or the current tape
338: * density was 6250. Testing of our 7980 suggests that the
339: * device cannot change densities mid-tape.
340: *
341: * ajv@comp.vuw.ac.nz
342: */
343: sc->sc_density = (sc->sc_stat2 & SR2_6250) ? T_6250BPI : (
344: (sc->sc_stat3 & SR3_1600) ? T_1600BPI : (
345: (sc->sc_stat3 & SR3_800) ? T_800BPI : -1));
346: req_den = (dev & T_DENSEL);
347:
348: if (flag & FWRITE) {
349: if (!(sc->sc_stat1 & SR1_BOT)) {
350: if (sc->sc_density != req_den) {
351: uprintf("%s: can't change density mid-tape\n",
352: sc->sc_dev.dv_xname);
353: error = EIO;
354: goto errout;
355: }
356: }
357: else {
358: int mtset_density =
359: (req_den == T_800BPI ? MTSET800BPI : (
360: req_den == T_1600BPI ? MTSET1600BPI : (
361: req_den == T_6250BPI ? MTSET6250BPI : (
362: sc->sc_type == MT7980ID
363: ? MTSET6250DC
364: : MTSET6250BPI))));
365: if (mtcommand(dev, mtset_density, 0) == 0)
366: sc->sc_density = req_den;
367: }
368: }
369: return (0);
370: errout:
371: sc->sc_flags &= ~MTF_OPEN;
372: return (error);
373: }
374:
375: int
376: mtclose(dev, flag, fmt, p)
377: dev_t dev;
378: int flag, fmt;
379: struct proc *p;
380: {
381: struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)];
382:
383: if (sc->sc_flags & MTF_WRT) {
384: (void) mtcommand(dev, MTWEOF, 2);
385: (void) mtcommand(dev, MTBSF, 0);
386: }
387: if ((minor(dev) & T_NOREWIND) == 0)
388: (void) mtcommand(dev, MTREW, 0);
389: sc->sc_flags &= ~MTF_OPEN;
390: return (0);
391: }
392:
393: int
394: mtcommand(dev, cmd, cnt)
395: dev_t dev;
396: int cmd;
397: int cnt;
398: {
399: struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)];
400: struct buf *bp = &sc->sc_bufstore;
401: int error = 0;
402:
403: #if 1
404: if (bp->b_flags & B_BUSY)
405: return (EBUSY);
406: #endif
407: bp->b_cmd = cmd;
408: bp->b_dev = dev;
409: do {
410: bp->b_flags = B_BUSY | B_CMD;
411: mtstrategy(bp);
412: biowait(bp);
413: if (bp->b_flags & B_ERROR) {
414: error = (int) (unsigned) bp->b_error;
415: break;
416: }
417: } while (--cnt > 0);
418: #if 0
419: bp->b_flags = 0 /*&= ~B_BUSY*/;
420: #else
421: bp->b_flags &= ~B_BUSY;
422: #endif
423: return (error);
424: }
425:
426: /*
427: * Only thing to check here is for legal record lengths (writes only).
428: */
429: void
430: mtstrategy(bp)
431: struct buf *bp;
432: {
433: struct mt_softc *sc;
434: struct buf *dp;
435: int unit;
436: int s;
437:
438: unit = UNIT(bp->b_dev);
439: sc = mt_cd.cd_devs[unit];
440: dlog(LOG_DEBUG, "%s strategy", sc->sc_dev.dv_xname);
441: if ((bp->b_flags & (B_CMD | B_READ)) == 0) {
442: #define WRITE_BITS_IGNORED 8
443: #if 0
444: if (bp->b_bcount & ((1 << WRITE_BITS_IGNORED) - 1)) {
445: printf("%s: write record must be multiple of %d\n",
446: sc->sc_dev.dv_xname, 1 << WRITE_BITS_IGNORED);
447: goto error;
448: }
449: #endif
450: s = 16 * 1024;
451: if (sc->sc_stat2 & SR2_LONGREC) {
452: switch (sc->sc_density) {
453: case T_1600BPI:
454: s = 32 * 1024;
455: break;
456:
457: case T_6250BPI:
458: case T_BADBPI:
459: s = 60 * 1024;
460: break;
461: }
462: }
463: if (bp->b_bcount > s) {
464: printf("%s: write record (%ld) too big: limit (%d)\n",
465: sc->sc_dev.dv_xname, bp->b_bcount, s);
466: #if 0 /* XXX see above */
467: error:
468: #endif
469: bp->b_flags |= B_ERROR;
470: bp->b_error = EIO;
471: s = splbio();
472: biodone(bp);
473: splx(s);
474: return;
475: }
476: }
477: dp = &sc->sc_tab;
478: bp->b_actf = NULL;
479: s = splbio();
480: bp->b_actb = dp->b_actb;
481: *dp->b_actb = bp;
482: dp->b_actb = &bp->b_actf;
483: if (dp->b_active == 0) {
484: dp->b_active = 1;
485: mtustart(sc);
486: }
487: splx(s);
488: }
489:
490: void
491: mtustart(sc)
492: struct mt_softc *sc;
493: {
494:
495: dlog(LOG_DEBUG, "%s ustart", sc->sc_dev.dv_xname);
496: if (hpibreq(sc->sc_dev.dv_parent, &sc->sc_hq))
497: mtstart(sc);
498: }
499:
500: void
501: spl_mtintr(arg)
502: void *arg;
503: {
504: struct mt_softc *sc = arg;
505: int s = splbio();
506:
507: hpibppclear(sc->sc_hpibno);
508: mtintr(sc);
509: splx(s);
510: }
511:
512: void
513: spl_mtstart(arg)
514: void *arg;
515: {
516: int s = splbio();
517:
518: mtstart(arg);
519: splx(s);
520: }
521:
522: void
523: mtstart(arg)
524: void *arg;
525: {
526: struct mt_softc *sc = arg;
527: struct buf *bp, *dp;
528: short cmdcount = 1;
529: u_char cmdbuf[2];
530: int s;
531:
532: dlog(LOG_DEBUG, "%s start", sc->sc_dev.dv_xname);
533: sc->sc_flags &= ~MTF_WRT;
534: bp = sc->sc_tab.b_actf;
535: if ((sc->sc_flags & MTF_ALIVE) == 0 &&
536: ((bp->b_flags & B_CMD) == 0 || bp->b_cmd != MTRESET))
537: goto fatalerror;
538:
539: if (sc->sc_flags & MTF_REW) {
540: if (!hpibpptest(sc->sc_hpibno, sc->sc_slave))
541: goto stillrew;
542: switch (mtreaddsj(sc, MTE_DSJ_FORCE|MTE_COMPLETE|MTE_IDLE)) {
543: case 0:
544: case 1:
545: stillrew:
546: if ((sc->sc_stat1 & SR1_BOT) ||
547: !(sc->sc_stat1 & SR1_ONLINE)) {
548: sc->sc_flags &= ~MTF_REW;
549: break;
550: }
551: case -2:
552: /*
553: * -2 means "timeout" reading DSJ, which is probably
554: * temporary. This is considered OK when doing a NOP,
555: * but not otherwise.
556: */
557: if (sc->sc_flags & (MTF_DSJTIMEO | MTF_STATTIMEO)) {
558: timeout_add(&sc->sc_start_to, hz >> 5);
559: return;
560: }
561: case 2:
562: if (bp->b_cmd != MTNOP || !(bp->b_flags & B_CMD)) {
563: bp->b_error = EBUSY;
564: goto errdone;
565: }
566: goto done;
567:
568: default:
569: goto fatalerror;
570: }
571: }
572: if (bp->b_flags & B_CMD) {
573: if (sc->sc_flags & MTF_PASTEOT) {
574: switch(bp->b_cmd) {
575: case MTFSF:
576: case MTWEOF:
577: case MTFSR:
578: bp->b_error = ENOSPC;
579: goto errdone;
580:
581: case MTBSF:
582: case MTOFFL:
583: case MTBSR:
584: case MTREW:
585: sc->sc_flags &= ~(MTF_PASTEOT | MTF_ATEOT);
586: break;
587: }
588: }
589: switch(bp->b_cmd) {
590: case MTFSF:
591: if (sc->sc_flags & MTF_HITEOF)
592: goto done;
593: cmdbuf[0] = MTTC_FSF;
594: break;
595:
596: case MTBSF:
597: if (sc->sc_flags & MTF_HITBOF)
598: goto done;
599: cmdbuf[0] = MTTC_BSF;
600: break;
601:
602: case MTOFFL:
603: sc->sc_flags |= MTF_REW;
604: cmdbuf[0] = MTTC_REWOFF;
605: break;
606:
607: case MTWEOF:
608: cmdbuf[0] = MTTC_WFM;
609: break;
610:
611: case MTBSR:
612: cmdbuf[0] = MTTC_BSR;
613: break;
614:
615: case MTFSR:
616: cmdbuf[0] = MTTC_FSR;
617: break;
618:
619: case MTREW:
620: sc->sc_flags |= MTF_REW;
621: cmdbuf[0] = MTTC_REW;
622: break;
623:
624: case MTNOP:
625: /*
626: * NOP is supposed to set status bits.
627: * Force readdsj to do it.
628: */
629: switch (mtreaddsj(sc,
630: MTE_DSJ_FORCE | MTE_COMPLETE | MTE_IDLE)) {
631: default:
632: goto done;
633:
634: case -1:
635: /*
636: * If this fails, perform a device clear
637: * to fix any protocol problems and (most
638: * likely) get the status.
639: */
640: bp->b_cmd = MTRESET;
641: break;
642:
643: case -2:
644: timeout_add(&sc->sc_start_to, hz >> 5);
645: return;
646: }
647:
648: case MTRESET:
649: /*
650: * 1) selected device clear (send with "-2" secondary)
651: * 2) set timeout, then wait for "service request"
652: * 3) interrupt will read DSJ (and END COMPLETE-IDLE)
653: */
654: if (hpibsend(sc->sc_hpibno, sc->sc_slave, -2, NULL, 0)){
655: log(LOG_ERR, "%s can't reset",
656: sc->sc_dev.dv_xname);
657: goto fatalerror;
658: }
659: timeout_add(&sc->sc_intr_to, 4 * hz);
660: hpibawait(sc->sc_hpibno);
661: return;
662:
663: case MTSET800BPI:
664: cmdbuf[0] = MTTC_800;
665: break;
666:
667: case MTSET1600BPI:
668: cmdbuf[0] = MTTC_1600;
669: break;
670:
671: case MTSET6250BPI:
672: cmdbuf[0] = MTTC_6250;
673: break;
674:
675: case MTSET6250DC:
676: cmdbuf[0] = MTTC_DC6250;
677: break;
678: }
679: } else {
680: if (sc->sc_flags & MTF_PASTEOT) {
681: bp->b_error = ENOSPC;
682: goto errdone;
683: }
684: if (bp->b_flags & B_READ) {
685: sc->sc_flags |= MTF_IO;
686: cmdbuf[0] = MTTC_READ;
687: } else {
688: sc->sc_flags |= MTF_WRT | MTF_IO;
689: cmdbuf[0] = MTTC_WRITE;
690: cmdbuf[1] = (bp->b_bcount + ((1 << WRITE_BITS_IGNORED) - 1)) >> WRITE_BITS_IGNORED;
691: cmdcount = 2;
692: }
693: }
694: if (hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_TCMD, cmdbuf, cmdcount)
695: == cmdcount) {
696: if (sc->sc_flags & MTF_REW)
697: goto done;
698: hpibawait(sc->sc_hpibno);
699: return;
700: }
701: fatalerror:
702: /*
703: * If anything fails, the drive is probably hosed, so mark it not
704: * "ALIVE" (but it EXISTS and is OPEN or we wouldn't be here, and
705: * if, last we heard, it was REWinding, remember that).
706: */
707: sc->sc_flags &= MTF_EXISTS | MTF_OPEN | MTF_REW;
708: bp->b_error = EIO;
709: errdone:
710: bp->b_flags |= B_ERROR;
711: done:
712: sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
713: s = splbio();
714: biodone(bp);
715: splx(s);
716: if ((dp = bp->b_actf))
717: dp->b_actb = bp->b_actb;
718: else
719: sc->sc_tab.b_actb = bp->b_actb;
720: *bp->b_actb = dp;
721: hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq);
722: if ((bp = dp) == NULL)
723: sc->sc_tab.b_active = 0;
724: else
725: mtustart(sc);
726: }
727:
728: /*
729: * The Utah code had a bug which meant that the driver was unable to read.
730: * "rw" was initialized to bp->b_flags & B_READ before "bp" was initialized.
731: * -- ajv@comp.vuw.ac.nz
732: */
733: void
734: mtgo(arg)
735: void *arg;
736: {
737: struct mt_softc *sc = arg;
738: struct buf *bp;
739: int rw;
740:
741: dlog(LOG_DEBUG, "%s go", sc->sc_dev.dv_xname);
742: bp = sc->sc_tab.b_actf;
743: rw = bp->b_flags & B_READ;
744: hpibgo(sc->sc_hpibno, sc->sc_slave, rw ? MTT_READ : MTL_WRITE,
745: bp->b_data, bp->b_bcount, rw, rw != 0);
746: }
747:
748: void
749: mtintr(arg)
750: void *arg;
751: {
752: struct mt_softc *sc = arg;
753: struct buf *bp, *dp;
754: int i;
755: u_char cmdbuf[4];
756:
757: bp = sc->sc_tab.b_actf;
758: if (bp == NULL) {
759: log(LOG_ERR, "%s intr: bp == NULL", sc->sc_dev.dv_xname);
760: return;
761: }
762:
763: dlog(LOG_DEBUG, "%s intr", sc->sc_dev.dv_xname);
764:
765: /*
766: * Some operation completed. Read status bytes and report errors.
767: * Clear EOF flags here `cause they're set once on specific conditions
768: * below when a command succeeds.
769: * A DSJ of 2 always means keep waiting. If the command was READ
770: * (and we're in data DMA phase) stop data transfer first.
771: */
772: sc->sc_flags &= ~(MTF_HITEOF | MTF_HITBOF);
773: if ((bp->b_flags & (B_CMD|B_READ)) == B_READ &&
774: !(sc->sc_flags & (MTF_IO | MTF_STATTIMEO | MTF_DSJTIMEO))){
775: cmdbuf[0] = MTE_STOP;
776: (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD,cmdbuf,1);
777: }
778: switch (mtreaddsj(sc, 0)) {
779: case 0:
780: break;
781:
782: case 1:
783: /*
784: * If we're in the middle of a READ/WRITE and have yet to
785: * start the data transfer, a DSJ of one should terminate it.
786: */
787: sc->sc_flags &= ~MTF_IO;
788: break;
789:
790: case 2:
791: (void) hpibawait(sc->sc_hpibno);
792: return;
793:
794: case -2:
795: /*
796: * -2 means that the drive failed to respond quickly enough
797: * to the request for DSJ. It's probably just "busy" figuring
798: * it out and will know in a little bit...
799: */
800: timeout_add(&sc->sc_intr_to, hz >> 5);
801: return;
802:
803: default:
804: log(LOG_ERR, "%s intr: can't get drive stat",
805: sc->sc_dev.dv_xname);
806: goto error;
807: }
808: if (sc->sc_stat1 & (SR1_ERR | SR1_REJECT)) {
809: i = sc->sc_stat4 & SR4_ERCLMASK;
810: log(LOG_ERR, "%s: %s error, retry %d, SR2/3 %x/%x, code %d",
811: sc->sc_dev.dv_xname, i == SR4_DEVICE ? "device" :
812: (i == SR4_PROTOCOL ? "protocol" :
813: (i == SR4_SELFTEST ? "selftest" : "unknown")),
814: sc->sc_stat4 & SR4_RETRYMASK, sc->sc_stat2,
815: sc->sc_stat3, sc->sc_stat5);
816:
817: if ((bp->b_flags & B_CMD) && bp->b_cmd == MTRESET)
818: timeout_del(&sc->sc_intr_to);
819: if (sc->sc_stat3 & SR3_POWERUP)
820: sc->sc_flags &= MTF_OPEN | MTF_EXISTS;
821: goto error;
822: }
823: /*
824: * Report and clear any soft errors.
825: */
826: if (sc->sc_stat1 & SR1_SOFTERR) {
827: log(LOG_WARNING, "%s: soft error, retry %d\n",
828: sc->sc_dev.dv_xname, sc->sc_stat4 & SR4_RETRYMASK);
829: sc->sc_stat1 &= ~SR1_SOFTERR;
830: }
831: /*
832: * We've initiated a read or write, but haven't actually started to
833: * DMA the data yet. At this point, the drive's ready.
834: */
835: if (sc->sc_flags & MTF_IO) {
836: sc->sc_flags &= ~MTF_IO;
837: if (hpibustart(sc->sc_hpibno))
838: mtgo(sc);
839: return;
840: }
841: /*
842: * Check for End Of Tape - we're allowed to hit EOT and then write (or
843: * read) one more record. If we get here and have not already hit EOT,
844: * return ENOSPC to inform the process that it's hit it. If we get
845: * here and HAVE already hit EOT, don't allow any more operations that
846: * move the tape forward.
847: */
848: if (sc->sc_stat1 & SR1_EOT) {
849: if (sc->sc_flags & MTF_ATEOT)
850: sc->sc_flags |= MTF_PASTEOT;
851: else {
852: bp->b_flags |= B_ERROR;
853: bp->b_error = ENOSPC;
854: sc->sc_flags |= MTF_ATEOT;
855: }
856: }
857: /*
858: * If a motion command was being executed, check for Tape Marks.
859: * If we were doing data, make sure we got the right amount, and
860: * check for hitting tape marks on reads.
861: */
862: if (bp->b_flags & B_CMD) {
863: if (sc->sc_stat1 & SR1_EOF) {
864: if (bp->b_cmd == MTFSR)
865: sc->sc_flags |= MTF_HITEOF;
866: if (bp->b_cmd == MTBSR)
867: sc->sc_flags |= MTF_HITBOF;
868: }
869: if (bp->b_cmd == MTRESET) {
870: timeout_del(&sc->sc_intr_to);
871: sc->sc_flags |= MTF_ALIVE;
872: }
873: } else {
874: i = hpibrecv(sc->sc_hpibno, sc->sc_slave, MTT_BCNT, cmdbuf, 2);
875: if (i != 2) {
876: log(LOG_ERR, "%s intr: can't get xfer length\n",
877: sc->sc_dev.dv_xname);
878: goto error;
879: }
880: i = (int) *((u_short *) cmdbuf);
881: if (i <= bp->b_bcount) {
882: if (i == 0)
883: sc->sc_flags |= MTF_HITEOF;
884: bp->b_resid = bp->b_bcount - i;
885: dlog(LOG_DEBUG, "%s intr: bcount %ld, resid %d",
886: sc->sc_dev.dv_xname, bp->b_bcount, bp->b_resid);
887: } else {
888: printf("%s: record (%d) larger than wanted (%ld)\n",
889: sc->sc_dev.dv_xname, i, bp->b_bcount);
890: error:
891: sc->sc_flags &= ~MTF_IO;
892: bp->b_error = EIO;
893: bp->b_flags |= B_ERROR;
894: }
895: }
896: /*
897: * The operation is completely done.
898: * Let the drive know with an END command.
899: */
900: cmdbuf[0] = MTE_COMPLETE | MTE_IDLE;
901: (void) hpibsend(sc->sc_hpibno, sc->sc_slave, MTL_ECMD, cmdbuf, 1);
902: bp->b_flags &= ~B_CMD;
903: biodone(bp);
904: if ((dp = bp->b_actf))
905: dp->b_actb = bp->b_actb;
906: else
907: sc->sc_tab.b_actb = bp->b_actb;
908: *bp->b_actb = dp;
909: hpibfree(sc->sc_dev.dv_parent, &sc->sc_hq);
910: #if 0
911: if (bp /*sc->sc_tab.b_actf*/ == NULL)
912: #else
913: if (sc->sc_tab.b_actf == NULL)
914: #endif
915: sc->sc_tab.b_active = 0;
916: else
917: mtustart(sc);
918: }
919:
920: int
921: mtread(dev, uio, flags)
922: dev_t dev;
923: struct uio *uio;
924: int flags;
925: {
926: struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)];
927:
928: return(physio(mtstrategy, &sc->sc_bufstore,
929: dev, B_READ, minphys, uio));
930: }
931:
932: int
933: mtwrite(dev, uio, flags)
934: dev_t dev;
935: struct uio *uio;
936: int flags;
937: {
938: struct mt_softc *sc = mt_cd.cd_devs[UNIT(dev)];
939:
940: return(physio(mtstrategy, &sc->sc_bufstore,
941: dev, B_WRITE, minphys, uio));
942: }
943:
944: int
945: mtioctl(dev, cmd, data, flag, p)
946: dev_t dev;
947: u_long cmd;
948: caddr_t data;
949: int flag;
950: struct proc *p;
951: {
952: struct mtop *op;
953: int cnt;
954:
955: switch (cmd) {
956: case MTIOCTOP:
957: op = (struct mtop *)data;
958: switch(op->mt_op) {
959: case MTWEOF:
960: case MTFSF:
961: case MTBSR:
962: case MTBSF:
963: case MTFSR:
964: cnt = op->mt_count;
965: break;
966:
967: case MTOFFL:
968: case MTREW:
969: case MTNOP:
970: cnt = 0;
971: break;
972:
973: default:
974: return (EINVAL);
975: }
976: return (mtcommand(dev, op->mt_op, cnt));
977:
978: case MTIOCGET:
979: break;
980:
981: default:
982: return (EINVAL);
983: }
984: return (0);
985: }
986:
987: /*ARGSUSED*/
988: int
989: mtdump(dev, blkno, va, size)
990: dev_t dev;
991: daddr64_t blkno;
992: caddr_t va;
993: size_t size;
994: {
995: return (ENODEV);
996: }