FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/wt.c
1
2 /*
3 * Streamer tape driver for 386bsd and FreeBSD.
4 * Supports Archive and Wangtek compatible QIC-02/QIC-36 boards.
5 *
6 * Copyright (C) 1993 by:
7 * Sergey Ryzhkov <sir@kiae.su>
8 * Serge Vakulenko <vak@zebub.msk.su>
9 *
10 * This software is distributed with NO WARRANTIES, not even the implied
11 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * Authors grant any other persons or organisations permission to use
14 * or modify this software as long as this message is kept with the software,
15 * all derivative works or modified versions.
16 *
17 * This driver is derived from the old 386bsd Wangtek streamer tape driver,
18 * made by Robert Baron at CMU, based on Intel sources.
19 * Authors thank Robert Baron, CMU and Intel and retain here
20 * the original CMU copyright notice.
21 *
22 * Version 1.3, Thu Nov 11 12:09:13 MSK 1993
23 */
24
25 #include <sys/cdefs.h>
26 __FBSDID("$FreeBSD: releng/5.2/sys/i386/isa/wt.c 118509 2003-08-05 20:11:50Z bde $");
27
28 /*
29 * Code for MTERASE added by John Lind (john@starfire.mn.org) 95/09/02.
30 * This was very easy due to the excellent structure and clear coding
31 * of the original driver.
32 */
33
34 /*
35 * Copyright (c) 1989 Carnegie-Mellon University.
36 * All rights reserved.
37 *
38 * Authors: Robert Baron
39 *
40 * Permission to use, copy, modify and distribute this software and
41 * its documentation is hereby granted, provided that both the copyright
42 * notice and this permission notice appear in all copies of the
43 * software, derivative works or modified versions, and any portions
44 * thereof, and that both notices appear in supporting documentation.
45 *
46 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
47 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
48 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
49 *
50 * Carnegie Mellon requests users of this software to return to
51 *
52 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
53 * School of Computer Science
54 * Carnegie Mellon University
55 * Pittsburgh PA 15213-3890
56 *
57 * any improvements or extensions that they make and grant Carnegie the
58 * rights to redistribute these changes.
59 */
60
61 #include "wt.h"
62
63 #include <sys/param.h>
64 #include <sys/systm.h>
65 #include <sys/kernel.h>
66 #include <sys/bio.h>
67 #include <sys/fcntl.h>
68 #include <sys/malloc.h>
69 #include <sys/mtio.h>
70 #include <sys/conf.h>
71 #include <sys/bus.h>
72
73
74 #include <i386/isa/isa_device.h>
75 #include <i386/isa/wtreg.h>
76
77 #ifndef COMPAT_OLDISA
78 #error "The wt device requires the old isa compatibility shims"
79 #endif
80
81 /*
82 * Uncomment this to enable internal device tracing.
83 */
84 #define TRACE(s) /* printf s */
85
86 #define WTPRI (PZERO+10) /* sleep priority */
87
88 /*
89 * Wangtek controller ports
90 */
91 #define WT_CTLPORT(base) ((base)+0) /* control, write only */
92 #define WT_STATPORT(base) ((base)+0) /* status, read only */
93 #define WT_CMDPORT(base) ((base)+1) /* command, write only */
94 #define WT_DATAPORT(base) ((base)+1) /* data, read only */
95 #define WT_NPORT 2 /* 2 i/o ports */
96
97 /* status port bits */
98 #define WT_BUSY 0x01 /* not ready bit define */
99 #define WT_NOEXCEP 0x02 /* no exception bit define */
100 #define WT_RESETMASK 0x07 /* to check after reset */
101 #define WT_RESETVAL 0x05 /* state after reset */
102
103 /* control port bits */
104 #define WT_ONLINE 0x01 /* device selected */
105 #define WT_RESET 0x02 /* reset command */
106 #define WT_REQUEST 0x04 /* request command */
107 #define WT_IEN 0x08 /* enable dma */
108
109 /*
110 * Archive controller ports
111 */
112 #define AV_DATAPORT(base) ((base)+0) /* data, read only */
113 #define AV_CMDPORT(base) ((base)+0) /* command, write only */
114 #define AV_STATPORT(base) ((base)+1) /* status, read only */
115 #define AV_CTLPORT(base) ((base)+1) /* control, write only */
116 #define AV_SDMAPORT(base) ((base)+2) /* start dma */
117 #define AV_RDMAPORT(base) ((base)+3) /* reset dma */
118 #define AV_NPORT 4 /* 4 i/o ports */
119
120 /* status port bits */
121 #define AV_BUSY 0x40 /* not ready bit define */
122 #define AV_NOEXCEP 0x20 /* no exception bit define */
123 #define AV_RESETMASK 0xf8 /* to check after reset */
124 #define AV_RESETVAL 0x50 /* state after reset */
125
126 /* control port bits */
127 #define AV_RESET 0x80 /* reset command */
128 #define AV_REQUEST 0x40 /* request command */
129 #define AV_IEN 0x20 /* enable interrupts */
130
131 enum wttype {
132 UNKNOWN = 0, /* unknown type, driver disabled */
133 ARCHIVE, /* Archive Viper SC499, SC402 etc */
134 WANGTEK /* Wangtek */
135 };
136
137 typedef struct {
138 unsigned short err; /* code for error encountered */
139 unsigned short ercnt; /* number of error blocks */
140 unsigned short urcnt; /* number of underruns */
141 } wtstatus_t;
142
143 typedef struct {
144 enum wttype type; /* type of controller */
145 unsigned unit; /* unit number */
146 unsigned port; /* base i/o port */
147 unsigned chan; /* dma channel number, 1..3 */
148 unsigned flags; /* state of tape drive */
149 unsigned dens; /* tape density */
150 int bsize; /* tape block size */
151 void *buf; /* internal i/o buffer */
152
153 void *dmavaddr; /* virtual address of dma i/o buffer */
154 unsigned dmatotal; /* size of i/o buffer */
155 unsigned dmaflags; /* i/o direction, ISADMA_READ or ISADMA_WRITE */
156 unsigned dmacount; /* resulting length of dma i/o */
157
158 wtstatus_t error; /* status of controller */
159
160 unsigned DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
161 unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL;
162 unsigned char ONLINE, RESET, REQUEST, IEN;
163 } wtinfo_t;
164
165 static wtinfo_t wttab[NWT]; /* tape info by unit number */
166
167 static int wtwait (wtinfo_t *t, int catch, char *msg);
168 static int wtcmd (wtinfo_t *t, int cmd);
169 static int wtstart (wtinfo_t *t, unsigned mode, void *vaddr, unsigned len);
170 static void wtdma (wtinfo_t *t);
171 static timeout_t wtimer;
172 static void wtclock (wtinfo_t *t);
173 static int wtreset (wtinfo_t *t);
174 static int wtsense (wtinfo_t *t, int verb, int ignor);
175 static int wtstatus (wtinfo_t *t);
176 static ointhand2_t wtintr;
177 static void wtrewind (wtinfo_t *t);
178 static int wtreadfm (wtinfo_t *t);
179 static int wtwritefm (wtinfo_t *t);
180 static int wtpoll (wtinfo_t *t, int mask, int bits);
181
182 static d_open_t wtopen;
183 static d_close_t wtclose;
184 static d_ioctl_t wtioctl;
185 static d_strategy_t wtstrategy;
186
187 #define CDEV_MAJOR 10
188
189 static struct cdevsw wt_cdevsw = {
190 .d_open = wtopen,
191 .d_close = wtclose,
192 .d_read = physread,
193 .d_write = physwrite,
194 .d_ioctl = wtioctl,
195 .d_strategy = wtstrategy,
196 .d_name = "wt",
197 .d_maj = CDEV_MAJOR,
198 };
199
200
201 /*
202 * Probe for the presence of the device.
203 */
204 static int
205 wtprobe (struct isa_device *id)
206 {
207 wtinfo_t *t = wttab + id->id_unit;
208
209 t->unit = id->id_unit;
210 t->chan = id->id_drq;
211 t->port = id->id_iobase;
212 if (t->chan<1 || t->chan>3) {
213 printf ("wt%d: Bad drq=%d, should be 1..3\n", t->unit, t->chan);
214 return (0);
215 }
216
217 /* Try Wangtek. */
218 t->type = WANGTEK;
219 t->CTLPORT = WT_CTLPORT (t->port); t->STATPORT = WT_STATPORT (t->port);
220 t->CMDPORT = WT_CMDPORT (t->port); t->DATAPORT = WT_DATAPORT (t->port);
221 t->SDMAPORT = 0; t->RDMAPORT = 0;
222 t->BUSY = WT_BUSY; t->NOEXCEP = WT_NOEXCEP;
223 t->RESETMASK = WT_RESETMASK; t->RESETVAL = WT_RESETVAL;
224 t->ONLINE = WT_ONLINE; t->RESET = WT_RESET;
225 t->REQUEST = WT_REQUEST; t->IEN = WT_IEN;
226 if (wtreset (t))
227 return (WT_NPORT);
228
229 /* Try Archive. */
230 t->type = ARCHIVE;
231 t->CTLPORT = AV_CTLPORT (t->port); t->STATPORT = AV_STATPORT (t->port);
232 t->CMDPORT = AV_CMDPORT (t->port); t->DATAPORT = AV_DATAPORT (t->port);
233 t->SDMAPORT = AV_SDMAPORT (t->port); t->RDMAPORT = AV_RDMAPORT (t->port);
234 t->BUSY = AV_BUSY; t->NOEXCEP = AV_NOEXCEP;
235 t->RESETMASK = AV_RESETMASK; t->RESETVAL = AV_RESETVAL;
236 t->ONLINE = 0; t->RESET = AV_RESET;
237 t->REQUEST = AV_REQUEST; t->IEN = AV_IEN;
238 if (wtreset (t))
239 return (AV_NPORT);
240
241 /* Tape controller not found. */
242 t->type = UNKNOWN;
243 return (0);
244 }
245
246 /*
247 * Device is found, configure it.
248 */
249 static int
250 wtattach (struct isa_device *id)
251 {
252 wtinfo_t *t = wttab + id->id_unit;
253 dev_t dev;
254
255 id->id_ointr = wtintr;
256 if (t->type == ARCHIVE) {
257 printf ("wt%d: type <Archive>\n", t->unit);
258 outb (t->RDMAPORT, 0); /* reset dma */
259 } else
260 printf ("wt%d: type <Wangtek>\n", t->unit);
261 t->flags = TPSTART; /* tape is rewound */
262 t->dens = -1; /* unknown density */
263 isa_dmainit(t->chan, 1024);
264
265 dev = make_dev(&wt_cdevsw, id->id_unit,
266 UID_ROOT, GID_WHEEL, 0600, "rwt%d", id->id_unit);
267 dev->si_drv1 = t;
268 return (1);
269 }
270
271 struct isa_driver wtdriver = {
272 INTR_TYPE_BIO,
273 wtprobe,
274 wtattach,
275 "wt",
276 };
277 COMPAT_ISA_DRIVER(wt, wtdriver);
278
279 /*
280 * Open routine, called on every device open.
281 */
282 static int
283 wtopen (dev_t dev, int flag, int fmt, struct thread *td)
284 {
285 int u = minor (dev) & WT_UNIT;
286 wtinfo_t *t;
287 int error;
288
289 if (u >= NWT)
290 return (ENXIO);
291
292 t = dev->si_drv1;
293
294 if (t->type == UNKNOWN)
295 return (ENXIO);
296
297 /* Check that device is not in use */
298 if (t->flags & TPINUSE)
299 return (EBUSY);
300
301 /* If the tape is in rewound state, check the status and set density. */
302 if (t->flags & TPSTART) {
303 /* If rewind is going on, wait */
304 error = wtwait (t, PCATCH, "wtrew");
305 if (error)
306 return (error);
307
308 /* Check the controller status */
309 if (! wtsense (t, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
310 /* Bad status, reset the controller */
311 if (! wtreset (t))
312 return (EIO);
313 if (! wtsense (t, 1, (flag & FWRITE) ? 0 : TP_WRP))
314 return (EIO);
315 }
316
317 /* Set up tape density. */
318 if (t->dens != (minor (dev) & WT_DENSEL)) {
319 int d = 0;
320
321 switch (minor (dev) & WT_DENSEL) {
322 case WT_DENSDFLT: default: break; /* default density */
323 case WT_QIC11: d = QIC_FMT11; break; /* minor 010 */
324 case WT_QIC24: d = QIC_FMT24; break; /* minor 020 */
325 case WT_QIC120: d = QIC_FMT120; break; /* minor 030 */
326 case WT_QIC150: d = QIC_FMT150; break; /* minor 040 */
327 case WT_QIC300: d = QIC_FMT300; break; /* minor 050 */
328 case WT_QIC600: d = QIC_FMT600; break; /* minor 060 */
329 }
330 if (d) {
331 /* Change tape density. */
332 if (! wtcmd (t, d))
333 return (EIO);
334 if (! wtsense (t, 1, TP_WRP | TP_ILL))
335 return (EIO);
336
337 /* Check the status of the controller. */
338 if (t->error.err & TP_ILL) {
339 printf ("wt%d: invalid tape density\n", t->unit);
340 return (ENODEV);
341 }
342 }
343 t->dens = minor (dev) & WT_DENSEL;
344 }
345 t->flags &= ~TPSTART;
346 } else if (t->dens != (minor (dev) & WT_DENSEL))
347 return (ENXIO);
348
349 t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512;
350 t->buf = malloc (t->bsize, M_TEMP, M_WAITOK);
351 if (! t->buf)
352 return (EAGAIN);
353
354 if (isa_dma_acquire(t->chan))
355 return(EBUSY);
356
357 t->flags = TPINUSE;
358
359 if (flag & FREAD)
360 t->flags |= TPREAD;
361 if (flag & FWRITE)
362 t->flags |= TPWRITE;
363 return (0);
364 }
365
366 /*
367 * Close routine, called on last device close.
368 */
369 static int
370 wtclose (dev_t dev, int flags, int fmt, struct thread *td)
371 {
372 int u = minor (dev) & WT_UNIT;
373 wtinfo_t *t;
374
375 t = dev->si_drv1;
376
377 if (u >= NWT || t->type == UNKNOWN)
378 return (ENXIO);
379
380 /* If rewind is pending, do nothing */
381 if (t->flags & TPREW)
382 goto done;
383
384 /* If seek forward is pending and no rewind on close, do nothing */
385 if (t->flags & TPRMARK) {
386 if (minor (dev) & WT_NOREWIND)
387 goto done;
388
389 /* If read file mark is going on, wait */
390 wtwait (t, 0, "wtrfm");
391 }
392
393 if (t->flags & TPWANY)
394 /* Tape was written. Write file mark. */
395 wtwritefm (t);
396
397 if (! (minor (dev) & WT_NOREWIND)) {
398 /* Rewind tape to beginning of tape. */
399 /* Don't wait until rewind, though. */
400 wtrewind (t);
401 goto done;
402 }
403 if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY)))
404 /* Space forward to after next file mark if no writing done. */
405 /* Don't wait for completion. */
406 wtreadfm (t);
407 done:
408 t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
409 free (t->buf, M_TEMP);
410 isa_dma_release(t->chan);
411 return (0);
412 }
413
414 /*
415 * Ioctl routine. Compatible with BSD ioctls.
416 * There are two possible ioctls:
417 * ioctl (int fd, MTIOCGET, struct mtget *buf) -- get status
418 * ioctl (int fd, MTIOCTOP, struct mtop *buf) -- do BSD-like op
419 */
420 static int
421 wtioctl (dev_t dev, u_long cmd, caddr_t arg, int flags, struct thread *td)
422 {
423 int u = minor (dev) & WT_UNIT;
424 wtinfo_t *t;
425 int error, count, op;
426
427 t = dev->si_drv1;
428 if (u >= NWT || t->type == UNKNOWN)
429 return (ENXIO);
430
431 switch (cmd) {
432 default:
433 return (EINVAL);
434 case MTIOCIEOT: /* ignore EOT errors */
435 case MTIOCEEOT: /* enable EOT errors */
436 return (0);
437 case MTIOCGET:
438 ((struct mtget*)arg)->mt_type =
439 t->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
440 ((struct mtget*)arg)->mt_dsreg = t->flags; /* status */
441 ((struct mtget*)arg)->mt_erreg = t->error.err; /* errors */
442 ((struct mtget*)arg)->mt_resid = 0;
443 ((struct mtget*)arg)->mt_fileno = 0; /* file */
444 ((struct mtget*)arg)->mt_blkno = 0; /* block */
445 return (0);
446 case MTIOCTOP:
447 break;
448 }
449 switch ((short) ((struct mtop*)arg)->mt_op) {
450 default:
451 case MTFSR: /* forward space record */
452 case MTBSR: /* backward space record */
453 case MTBSF: /* backward space file */
454 break;
455 case MTNOP: /* no operation, sets status only */
456 case MTCACHE: /* enable controller cache */
457 case MTNOCACHE: /* disable controller cache */
458 return (0);
459 case MTREW: /* rewind */
460 case MTOFFL: /* rewind and put the drive offline */
461 if (t->flags & TPREW) /* rewind is running */
462 return (0);
463 error = wtwait (t, PCATCH, "wtorew");
464 if (error)
465 return (error);
466 wtrewind (t);
467 return (0);
468 case MTFSF: /* forward space file */
469 for (count=((struct mtop*)arg)->mt_count; count>0; --count) {
470 error = wtwait (t, PCATCH, "wtorfm");
471 if (error)
472 return (error);
473 error = wtreadfm (t);
474 if (error)
475 return (error);
476 }
477 return (0);
478 case MTWEOF: /* write an end-of-file record */
479 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
480 return (EACCES);
481 error = wtwait (t, PCATCH, "wtowfm");
482 if (error)
483 return (error);
484 error = wtwritefm (t);
485 if (error)
486 return (error);
487 return (0);
488 case MTRETENS: /* re-tension tape */
489 error = wtwait (t, PCATCH, "wtretens");
490 if (error)
491 return (error);
492 op = QIC_RETENS;
493 goto erase_retens;
494
495 case MTERASE: /* erase to EOM */
496 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
497 return (EACCES);
498 error = wtwait (t, PCATCH, "wterase");
499 if (error)
500 return (error);
501 op = QIC_ERASE;
502 erase_retens:
503 /* ERASE and RETENS operations work like REWIND. */
504 /* Simulate the rewind operation here. */
505 t->flags &= ~(TPRO | TPWO | TPVOL);
506 if (! wtcmd (t, op))
507 return (EIO);
508 t->flags |= TPSTART | TPREW;
509 t->flags |= TPWANY;
510 wtclock (t);
511 return (0);
512 }
513 return (EINVAL);
514 }
515
516 /*
517 * Strategy routine.
518 */
519 static void
520 wtstrategy (struct bio *bp)
521 {
522 int u = minor (bp->bio_dev) & WT_UNIT;
523 wtinfo_t *t;
524 int s;
525
526 t = bp->bio_dev->si_drv1;
527 bp->bio_resid = bp->bio_bcount;
528 if (u >= NWT || t->type == UNKNOWN) {
529 bp->bio_error = ENXIO;
530 goto err2xit;
531 }
532
533 /* at file marks and end of tape, we just return '0 bytes available' */
534 if (t->flags & TPVOL)
535 goto xit;
536
537 if (bp->bio_bcount % t->bsize != 0) {
538 bp->bio_error = EINVAL;
539 goto err2xit;
540 }
541
542 if (bp->bio_cmd == BIO_READ) {
543 /* Check read access and no previous write to this tape. */
544 if (! (t->flags & TPREAD) || (t->flags & TPWANY))
545 goto errxit;
546
547 /* For now, we assume that all data will be copied out */
548 /* If read command outstanding, just skip down */
549 if (! (t->flags & TPRO)) {
550 if (! wtsense (t, 1, TP_WRP)) /* clear status */
551 goto errxit;
552 if (! wtcmd (t, QIC_RDDATA)) { /* sed read mode */
553 wtsense (t, 1, TP_WRP);
554 goto errxit;
555 }
556 t->flags |= TPRO | TPRANY;
557 }
558 } else {
559 /* Check write access and write protection. */
560 /* No previous read from this tape allowed. */
561 if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY)))
562 goto errxit;
563
564 /* If write command outstanding, just skip down */
565 if (! (t->flags & TPWO)) {
566 if (! wtsense (t, 1, 0)) /* clear status */
567 goto errxit;
568 if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
569 wtsense (t, 1, 0);
570 goto errxit;
571 }
572 t->flags |= TPWO | TPWANY;
573 }
574 }
575
576 if (! bp->bio_bcount)
577 goto xit;
578
579 t->flags &= ~TPEXCEP;
580 s = splbio ();
581 if (wtstart (t, bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
582 bp->bio_data, bp->bio_bcount)) {
583 wtwait (t, 0, (bp->bio_cmd == BIO_READ) ? "wtread" : "wtwrite");
584 bp->bio_resid -= t->dmacount;
585 }
586 splx (s);
587
588 if (t->flags & TPEXCEP) {
589 errxit: bp->bio_error = EIO;
590 err2xit: bp->bio_flags |= BIO_ERROR;
591 }
592 xit: biodone (bp);
593 return;
594 }
595
596 /*
597 * Interrupt routine.
598 */
599 static void
600 wtintr (int u)
601 {
602 wtinfo_t *t = wttab + u;
603 unsigned char s;
604
605 if (u >= NWT || t->type == UNKNOWN) {
606 TRACE (("wtintr() -- device not configured\n"));
607 return;
608 }
609
610 s = inb (t->STATPORT); /* get status */
611 TRACE (("wtintr() status=0x%x -- ", s));
612 if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) {
613 TRACE (("busy\n"));
614 return; /* device is busy */
615 }
616
617 /*
618 * Check if rewind finished.
619 */
620 if (t->flags & TPREW) {
621 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
622 "rewind busy?\n" : "rewind finished\n"));
623 t->flags &= ~TPREW; /* Rewind finished. */
624 wtsense (t, 1, TP_WRP);
625 wakeup (t);
626 return;
627 }
628
629 /*
630 * Check if writing/reading of file mark finished.
631 */
632 if (t->flags & (TPRMARK | TPWMARK)) {
633 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
634 "marker r/w busy?\n" : "marker r/w finished\n"));
635 if (! (s & t->NOEXCEP)) /* operation failed */
636 wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0);
637 t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
638 wakeup (t);
639 return;
640 }
641
642 /*
643 * Do we started any i/o? If no, just return.
644 */
645 if (! (t->flags & TPACTIVE)) {
646 TRACE (("unexpected interrupt\n"));
647 return;
648 }
649
650 /*
651 * Clean up dma.
652 */
653 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize) {
654 /* If reading short block, copy the internal buffer
655 * to the user memory. */
656 isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan);
657 bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
658 } else
659 isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
660
661 t->flags &= ~TPACTIVE;
662 t->dmacount += t->bsize;
663 t->dmavaddr = (char *)t->dmavaddr + t->bsize;
664
665 /*
666 * On exception, check for end of file and end of volume.
667 */
668 if (! (s & t->NOEXCEP)) {
669 TRACE (("i/o exception\n"));
670 wtsense (t, 1, (t->dmaflags & ISADMA_READ) ? TP_WRP : 0);
671 if (t->error.err & (TP_EOM | TP_FIL))
672 t->flags |= TPVOL; /* end of file */
673 else
674 t->flags |= TPEXCEP; /* i/o error */
675 wakeup (t);
676 return;
677 }
678
679 if (t->dmacount < t->dmatotal) { /* continue i/o */
680 wtdma (t);
681 TRACE (("continue i/o, %d\n", t->dmacount));
682 return;
683 }
684 if (t->dmacount > t->dmatotal) /* short last block */
685 t->dmacount = t->dmatotal;
686 wakeup (t); /* wake up user level */
687 TRACE (("i/o finished, %d\n", t->dmacount));
688 }
689
690 /* start the rewind operation */
691 static void
692 wtrewind (wtinfo_t *t)
693 {
694 int rwmode = (t->flags & (TPRO | TPWO));
695
696 t->flags &= ~(TPRO | TPWO | TPVOL);
697 /*
698 * Wangtek strictly follows QIC-02 standard:
699 * clearing ONLINE in read/write modes causes rewind.
700 * REWIND command is not allowed in read/write mode
701 * and gives `illegal command' error.
702 */
703 if (t->type==WANGTEK && rwmode) {
704 outb (t->CTLPORT, 0);
705 } else if (! wtcmd (t, QIC_REWIND))
706 return;
707 t->flags |= TPSTART | TPREW;
708 wtclock (t);
709 }
710
711 /* start the `read marker' operation */
712 static int
713 wtreadfm (wtinfo_t *t)
714 {
715 t->flags &= ~(TPRO | TPWO | TPVOL);
716 if (! wtcmd (t, QIC_READFM)) {
717 wtsense (t, 1, TP_WRP);
718 return (EIO);
719 }
720 t->flags |= TPRMARK | TPRANY;
721 wtclock (t);
722 /* Don't wait for completion here. */
723 return (0);
724 }
725
726 /* write marker to the tape */
727 static int
728 wtwritefm (wtinfo_t *t)
729 {
730 tsleep (wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */
731 t->flags &= ~(TPRO | TPWO);
732 if (! wtcmd (t, QIC_WRITEFM)) {
733 wtsense (t, 1, 0);
734 return (EIO);
735 }
736 t->flags |= TPWMARK | TPWANY;
737 wtclock (t);
738 return (wtwait (t, 0, "wtwfm"));
739 }
740
741 /* while controller status & mask == bits continue waiting */
742 static int
743 wtpoll (wtinfo_t *t, int mask, int bits)
744 {
745 int s, i;
746
747 /* Poll status port, waiting for specified bits. */
748 for (i=0; i<1000; ++i) { /* up to 1 msec */
749 s = inb (t->STATPORT);
750 if ((s & mask) != bits)
751 return (s);
752 DELAY (1);
753 }
754 for (i=0; i<100; ++i) { /* up to 10 msec */
755 s = inb (t->STATPORT);
756 if ((s & mask) != bits)
757 return (s);
758 DELAY (100);
759 }
760 for (;;) { /* forever */
761 s = inb (t->STATPORT);
762 if ((s & mask) != bits)
763 return (s);
764 tsleep (wtpoll, WTPRI, "wtpoll", 1); /* timeout: 1 tick */
765 }
766 }
767
768 /* execute QIC command */
769 static int
770 wtcmd (wtinfo_t *t, int cmd)
771 {
772 int s, x;
773
774 TRACE (("wtcmd() cmd=0x%x\n", cmd));
775 x = splbio();
776 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
777 if (! (s & t->NOEXCEP)) { /* error */
778 splx(x);
779 return (0);
780 }
781
782 outb (t->CMDPORT, cmd); /* output the command */
783
784 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
785 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
786 outb (t->CTLPORT, t->IEN | t->ONLINE); /* reset request */
787 wtpoll (t, t->BUSY, 0); /* wait for not ready */
788 splx(x);
789 return (1);
790 }
791
792 /* wait for the end of i/o, seeking marker or rewind operation */
793 static int
794 wtwait (wtinfo_t *t, int catch, char *msg)
795 {
796 int error;
797
798 TRACE (("wtwait() `%s'\n", msg));
799 while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) {
800 error = tsleep (t, WTPRI | catch, msg, 0);
801 if (error)
802 return (error);
803 }
804 return (0);
805 }
806
807 /* initialize dma for the i/o operation */
808 static void
809 wtdma (wtinfo_t *t)
810 {
811 t->flags |= TPACTIVE;
812 wtclock (t);
813
814 if (t->type == ARCHIVE)
815 outb (t->SDMAPORT, 0); /* set dma */
816
817 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize)
818 /* Reading short block. Do it through the internal buffer. */
819 isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan);
820 else
821 isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
822 }
823
824 /* start i/o operation */
825 static int
826 wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
827 {
828 int s, x;
829
830 TRACE (("wtstart()\n"));
831 x = splbio();
832 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
833 if (! (s & t->NOEXCEP)) {
834 t->flags |= TPEXCEP; /* error */
835 splx(x);
836 return (0);
837 }
838 t->flags &= ~TPEXCEP; /* clear exception flag */
839 t->dmavaddr = vaddr;
840 t->dmatotal = len;
841 t->dmacount = 0;
842 t->dmaflags = flags;
843 wtdma (t);
844 splx(x);
845 return (1);
846 }
847
848 /* start timer */
849 static void
850 wtclock (wtinfo_t *t)
851 {
852 if (! (t->flags & TPTIMER)) {
853 t->flags |= TPTIMER;
854 /* Some controllers seem to lose dma interrupts too often.
855 * To make the tape stream we need 1 tick timeout. */
856 timeout (wtimer, (caddr_t)t, (t->flags & TPACTIVE) ? 1 : hz);
857 }
858 }
859
860 /*
861 * Simulate an interrupt periodically while i/o is going.
862 * This is necessary in case interrupts get eaten due to
863 * multiple devices on a single IRQ line.
864 */
865 static void
866 wtimer (void *xt)
867 {
868 wtinfo_t *t = (wtinfo_t *)xt;
869 int s;
870
871 t->flags &= ~TPTIMER;
872 if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
873 return;
874
875 /* If i/o going, simulate interrupt. */
876 s = splbio ();
877 if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) {
878 TRACE (("wtimer() -- "));
879 wtintr (t->unit);
880 }
881 splx (s);
882
883 /* Restart timer if i/o pending. */
884 if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
885 wtclock (t);
886 }
887
888 /* reset the controller */
889 static int
890 wtreset (wtinfo_t *t)
891 {
892 /* Perform QIC-02 and QIC-36 compatible reset sequence. */
893 /* Thanks to Mikael Hybsch <micke@dynas.se>. */
894 int s, i;
895
896 outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */
897 DELAY (30);
898 outb (t->CTLPORT, t->ONLINE); /* turn off reset */
899 DELAY (30);
900
901 /* Read the controller status. */
902 s = inb (t->STATPORT);
903 if (s == 0xff) /* no port at this address? */
904 return (0);
905
906 /* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
907 for (i=0; i<3000; ++i) {
908 if (! (s & t->BUSY) || ! (s & t->NOEXCEP))
909 break;
910 DELAY (1000);
911 s = inb (t->STATPORT);
912 }
913 return ((s & t->RESETMASK) == t->RESETVAL);
914 }
915
916 /* get controller status information */
917 /* return 0 if user i/o request should receive an i/o error code */
918 static int
919 wtsense (wtinfo_t *t, int verb, int ignor)
920 {
921 char *msg = 0;
922 int err;
923
924 TRACE (("wtsense() ignor=0x%x\n", ignor));
925 t->flags &= ~(TPRO | TPWO);
926 if (! wtstatus (t))
927 return (0);
928 if (! (t->error.err & TP_ST0))
929 t->error.err &= ~TP_ST0MASK;
930 if (! (t->error.err & TP_ST1))
931 t->error.err &= ~TP_ST1MASK;
932 t->error.err &= ~ignor; /* ignore certain errors */
933 err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
934 TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
935 if (! err)
936 return (1);
937 if (! verb)
938 return (0);
939
940 /* lifted from tdriver.c from Wangtek */
941 if (err & TP_USL) msg = "Drive not online";
942 else if (err & TP_CNI) msg = "No cartridge";
943 else if ((err & TP_WRP) && !(t->flags & TPWP)) {
944 msg = "Tape is write protected";
945 t->flags |= TPWP;
946 }
947 else if (err & TP_FIL) msg = 0 /*"Filemark detected"*/;
948 else if (err & TP_EOM) msg = 0 /*"End of tape"*/;
949 else if (err & TP_BNL) msg = "Block not located";
950 else if (err & TP_UDA) msg = "Unrecoverable data error";
951 else if (err & TP_NDT) msg = "No data detected";
952 else if (err & TP_ILL) msg = "Illegal command";
953 if (msg)
954 printf ("wt%d: %s\n", t->unit, msg);
955 return (0);
956 }
957
958 /* get controller status information */
959 static int
960 wtstatus (wtinfo_t *t)
961 {
962 char *p;
963 int x;
964
965 x = splbio();
966 wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
967 outb (t->CMDPORT, QIC_RDSTAT); /* send `read status' command */
968
969 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
970 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
971 outb (t->CTLPORT, t->ONLINE); /* reset request */
972 wtpoll (t, t->BUSY, 0); /* wait for not ready */
973
974 p = (char*) &t->error;
975 while (p < (char*)&t->error + 6) {
976 int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP);
977 if (! (s & t->NOEXCEP)) { /* error */
978 splx(x);
979 return (0);
980 }
981
982 *p++ = inb (t->DATAPORT); /* read status byte */
983
984 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
985 wtpoll (t, t->BUSY, 0); /* wait for not ready */
986 DELAY(20);
987 outb (t->CTLPORT, t->ONLINE); /* unset request */
988 }
989 splx(x);
990 return (1);
991 }
Cache object: 46dfc9f7c5660c97077c9d2a53a37148
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