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 * $FreeBSD: releng/5.1/sys/i386/isa/wt.c 111815 2003-03-03 12:15:54Z phk $
24 *
25 */
26
27 /*
28 * Code for MTERASE added by John Lind (john@starfire.mn.org) 95/09/02.
29 * This was very easy due to the excellent structure and clear coding
30 * of the original driver.
31 */
32
33 /*
34 * Copyright (c) 1989 Carnegie-Mellon University.
35 * All rights reserved.
36 *
37 * Authors: Robert Baron
38 *
39 * Permission to use, copy, modify and distribute this software and
40 * its documentation is hereby granted, provided that both the copyright
41 * notice and this permission notice appear in all copies of the
42 * software, derivative works or modified versions, and any portions
43 * thereof, and that both notices appear in supporting documentation.
44 *
45 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
46 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
47 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
48 *
49 * Carnegie Mellon requests users of this software to return to
50 *
51 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
52 * School of Computer Science
53 * Carnegie Mellon University
54 * Pittsburgh PA 15213-3890
55 *
56 * any improvements or extensions that they make and grant Carnegie the
57 * rights to redistribute these changes.
58 */
59
60 #include "wt.h"
61
62 #include <sys/param.h>
63 #include <sys/systm.h>
64 #include <sys/kernel.h>
65 #include <sys/bio.h>
66 #include <sys/fcntl.h>
67 #include <sys/malloc.h>
68 #include <sys/mtio.h>
69 #include <sys/conf.h>
70 #include <sys/bus.h>
71
72
73 #include <i386/isa/isa_device.h>
74 #include <i386/isa/wtreg.h>
75
76 #ifndef COMPAT_OLDISA
77 #error "The wt device requires the old isa compatibility shims"
78 #endif
79
80 /*
81 * Uncomment this to enable internal device tracing.
82 */
83 #define TRACE(s) /* printf s */
84
85 #define WTPRI (PZERO+10) /* sleep priority */
86
87 /*
88 * Wangtek controller ports
89 */
90 #define WT_CTLPORT(base) ((base)+0) /* control, write only */
91 #define WT_STATPORT(base) ((base)+0) /* status, read only */
92 #define WT_CMDPORT(base) ((base)+1) /* command, write only */
93 #define WT_DATAPORT(base) ((base)+1) /* data, read only */
94 #define WT_NPORT 2 /* 2 i/o ports */
95
96 /* status port bits */
97 #define WT_BUSY 0x01 /* not ready bit define */
98 #define WT_NOEXCEP 0x02 /* no exception bit define */
99 #define WT_RESETMASK 0x07 /* to check after reset */
100 #define WT_RESETVAL 0x05 /* state after reset */
101
102 /* control port bits */
103 #define WT_ONLINE 0x01 /* device selected */
104 #define WT_RESET 0x02 /* reset command */
105 #define WT_REQUEST 0x04 /* request command */
106 #define WT_IEN 0x08 /* enable dma */
107
108 /*
109 * Archive controller ports
110 */
111 #define AV_DATAPORT(base) ((base)+0) /* data, read only */
112 #define AV_CMDPORT(base) ((base)+0) /* command, write only */
113 #define AV_STATPORT(base) ((base)+1) /* status, read only */
114 #define AV_CTLPORT(base) ((base)+1) /* control, write only */
115 #define AV_SDMAPORT(base) ((base)+2) /* start dma */
116 #define AV_RDMAPORT(base) ((base)+3) /* reset dma */
117 #define AV_NPORT 4 /* 4 i/o ports */
118
119 /* status port bits */
120 #define AV_BUSY 0x40 /* not ready bit define */
121 #define AV_NOEXCEP 0x20 /* no exception bit define */
122 #define AV_RESETMASK 0xf8 /* to check after reset */
123 #define AV_RESETVAL 0x50 /* state after reset */
124
125 /* control port bits */
126 #define AV_RESET 0x80 /* reset command */
127 #define AV_REQUEST 0x40 /* request command */
128 #define AV_IEN 0x20 /* enable interrupts */
129
130 enum wttype {
131 UNKNOWN = 0, /* unknown type, driver disabled */
132 ARCHIVE, /* Archive Viper SC499, SC402 etc */
133 WANGTEK /* Wangtek */
134 };
135
136 typedef struct {
137 unsigned short err; /* code for error encountered */
138 unsigned short ercnt; /* number of error blocks */
139 unsigned short urcnt; /* number of underruns */
140 } wtstatus_t;
141
142 typedef struct {
143 enum wttype type; /* type of controller */
144 unsigned unit; /* unit number */
145 unsigned port; /* base i/o port */
146 unsigned chan; /* dma channel number, 1..3 */
147 unsigned flags; /* state of tape drive */
148 unsigned dens; /* tape density */
149 int bsize; /* tape block size */
150 void *buf; /* internal i/o buffer */
151
152 void *dmavaddr; /* virtual address of dma i/o buffer */
153 unsigned dmatotal; /* size of i/o buffer */
154 unsigned dmaflags; /* i/o direction, ISADMA_READ or ISADMA_WRITE */
155 unsigned dmacount; /* resulting length of dma i/o */
156
157 wtstatus_t error; /* status of controller */
158
159 unsigned short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
160 unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL;
161 unsigned char ONLINE, RESET, REQUEST, IEN;
162 } wtinfo_t;
163
164 static wtinfo_t wttab[NWT]; /* tape info by unit number */
165
166 static int wtwait (wtinfo_t *t, int catch, char *msg);
167 static int wtcmd (wtinfo_t *t, int cmd);
168 static int wtstart (wtinfo_t *t, unsigned mode, void *vaddr, unsigned len);
169 static void wtdma (wtinfo_t *t);
170 static timeout_t wtimer;
171 static void wtclock (wtinfo_t *t);
172 static int wtreset (wtinfo_t *t);
173 static int wtsense (wtinfo_t *t, int verb, int ignor);
174 static int wtstatus (wtinfo_t *t);
175 static ointhand2_t wtintr;
176 static void wtrewind (wtinfo_t *t);
177 static int wtreadfm (wtinfo_t *t);
178 static int wtwritefm (wtinfo_t *t);
179 static int wtpoll (wtinfo_t *t, int mask, int bits);
180
181 static d_open_t wtopen;
182 static d_close_t wtclose;
183 static d_ioctl_t wtioctl;
184 static d_strategy_t wtstrategy;
185
186 #define CDEV_MAJOR 10
187
188 static struct cdevsw wt_cdevsw = {
189 .d_open = wtopen,
190 .d_close = wtclose,
191 .d_read = physread,
192 .d_write = physwrite,
193 .d_ioctl = wtioctl,
194 .d_strategy = wtstrategy,
195 .d_name = "wt",
196 .d_maj = CDEV_MAJOR,
197 };
198
199
200 /*
201 * Probe for the presence of the device.
202 */
203 static int
204 wtprobe (struct isa_device *id)
205 {
206 wtinfo_t *t = wttab + id->id_unit;
207
208 t->unit = id->id_unit;
209 t->chan = id->id_drq;
210 t->port = id->id_iobase;
211 if (t->chan<1 || t->chan>3) {
212 printf ("wt%d: Bad drq=%d, should be 1..3\n", t->unit, t->chan);
213 return (0);
214 }
215
216 /* Try Wangtek. */
217 t->type = WANGTEK;
218 t->CTLPORT = WT_CTLPORT (t->port); t->STATPORT = WT_STATPORT (t->port);
219 t->CMDPORT = WT_CMDPORT (t->port); t->DATAPORT = WT_DATAPORT (t->port);
220 t->SDMAPORT = 0; t->RDMAPORT = 0;
221 t->BUSY = WT_BUSY; t->NOEXCEP = WT_NOEXCEP;
222 t->RESETMASK = WT_RESETMASK; t->RESETVAL = WT_RESETVAL;
223 t->ONLINE = WT_ONLINE; t->RESET = WT_RESET;
224 t->REQUEST = WT_REQUEST; t->IEN = WT_IEN;
225 if (wtreset (t))
226 return (WT_NPORT);
227
228 /* Try Archive. */
229 t->type = ARCHIVE;
230 t->CTLPORT = AV_CTLPORT (t->port); t->STATPORT = AV_STATPORT (t->port);
231 t->CMDPORT = AV_CMDPORT (t->port); t->DATAPORT = AV_DATAPORT (t->port);
232 t->SDMAPORT = AV_SDMAPORT (t->port); t->RDMAPORT = AV_RDMAPORT (t->port);
233 t->BUSY = AV_BUSY; t->NOEXCEP = AV_NOEXCEP;
234 t->RESETMASK = AV_RESETMASK; t->RESETVAL = AV_RESETVAL;
235 t->ONLINE = 0; t->RESET = AV_RESET;
236 t->REQUEST = AV_REQUEST; t->IEN = AV_IEN;
237 if (wtreset (t))
238 return (AV_NPORT);
239
240 /* Tape controller not found. */
241 t->type = UNKNOWN;
242 return (0);
243 }
244
245 /*
246 * Device is found, configure it.
247 */
248 static int
249 wtattach (struct isa_device *id)
250 {
251 wtinfo_t *t = wttab + id->id_unit;
252
253 id->id_ointr = wtintr;
254 if (t->type == ARCHIVE) {
255 printf ("wt%d: type <Archive>\n", t->unit);
256 outb (t->RDMAPORT, 0); /* reset dma */
257 } else
258 printf ("wt%d: type <Wangtek>\n", t->unit);
259 t->flags = TPSTART; /* tape is rewound */
260 t->dens = -1; /* unknown density */
261 isa_dmainit(t->chan, 1024);
262
263 make_dev(&wt_cdevsw, id->id_unit, 0, 0, 0600, "rwt%d", id->id_unit);
264 return (1);
265 }
266
267 struct isa_driver wtdriver = {
268 INTR_TYPE_BIO,
269 wtprobe,
270 wtattach,
271 "wt",
272 };
273 COMPAT_ISA_DRIVER(wt, wtdriver);
274
275 /*
276 * Open routine, called on every device open.
277 */
278 static int
279 wtopen (dev_t dev, int flag, int fmt, struct thread *td)
280 {
281 int u = minor (dev) & WT_UNIT;
282 wtinfo_t *t = wttab + u;
283 int error;
284
285 if (u >= NWT || t->type == UNKNOWN)
286 return (ENXIO);
287
288 /* Check that device is not in use */
289 if (t->flags & TPINUSE)
290 return (EBUSY);
291
292 /* If the tape is in rewound state, check the status and set density. */
293 if (t->flags & TPSTART) {
294 /* If rewind is going on, wait */
295 error = wtwait (t, PCATCH, "wtrew");
296 if (error)
297 return (error);
298
299 /* Check the controller status */
300 if (! wtsense (t, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
301 /* Bad status, reset the controller */
302 if (! wtreset (t))
303 return (EIO);
304 if (! wtsense (t, 1, (flag & FWRITE) ? 0 : TP_WRP))
305 return (EIO);
306 }
307
308 /* Set up tape density. */
309 if (t->dens != (minor (dev) & WT_DENSEL)) {
310 int d = 0;
311
312 switch (minor (dev) & WT_DENSEL) {
313 case WT_DENSDFLT: default: break; /* default density */
314 case WT_QIC11: d = QIC_FMT11; break; /* minor 010 */
315 case WT_QIC24: d = QIC_FMT24; break; /* minor 020 */
316 case WT_QIC120: d = QIC_FMT120; break; /* minor 030 */
317 case WT_QIC150: d = QIC_FMT150; break; /* minor 040 */
318 case WT_QIC300: d = QIC_FMT300; break; /* minor 050 */
319 case WT_QIC600: d = QIC_FMT600; break; /* minor 060 */
320 }
321 if (d) {
322 /* Change tape density. */
323 if (! wtcmd (t, d))
324 return (EIO);
325 if (! wtsense (t, 1, TP_WRP | TP_ILL))
326 return (EIO);
327
328 /* Check the status of the controller. */
329 if (t->error.err & TP_ILL) {
330 printf ("wt%d: invalid tape density\n", t->unit);
331 return (ENODEV);
332 }
333 }
334 t->dens = minor (dev) & WT_DENSEL;
335 }
336 t->flags &= ~TPSTART;
337 } else if (t->dens != (minor (dev) & WT_DENSEL))
338 return (ENXIO);
339
340 t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512;
341 t->buf = malloc (t->bsize, M_TEMP, M_WAITOK);
342 if (! t->buf)
343 return (EAGAIN);
344
345 if (isa_dma_acquire(t->chan))
346 return(EBUSY);
347
348 t->flags = TPINUSE;
349
350 if (flag & FREAD)
351 t->flags |= TPREAD;
352 if (flag & FWRITE)
353 t->flags |= TPWRITE;
354 return (0);
355 }
356
357 /*
358 * Close routine, called on last device close.
359 */
360 static int
361 wtclose (dev_t dev, int flags, int fmt, struct thread *td)
362 {
363 int u = minor (dev) & WT_UNIT;
364 wtinfo_t *t = wttab + u;
365
366 if (u >= NWT || t->type == UNKNOWN)
367 return (ENXIO);
368
369 /* If rewind is pending, do nothing */
370 if (t->flags & TPREW)
371 goto done;
372
373 /* If seek forward is pending and no rewind on close, do nothing */
374 if (t->flags & TPRMARK) {
375 if (minor (dev) & WT_NOREWIND)
376 goto done;
377
378 /* If read file mark is going on, wait */
379 wtwait (t, 0, "wtrfm");
380 }
381
382 if (t->flags & TPWANY)
383 /* Tape was written. Write file mark. */
384 wtwritefm (t);
385
386 if (! (minor (dev) & WT_NOREWIND)) {
387 /* Rewind tape to beginning of tape. */
388 /* Don't wait until rewind, though. */
389 wtrewind (t);
390 goto done;
391 }
392 if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY)))
393 /* Space forward to after next file mark if no writing done. */
394 /* Don't wait for completion. */
395 wtreadfm (t);
396 done:
397 t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
398 free (t->buf, M_TEMP);
399 isa_dma_release(t->chan);
400 return (0);
401 }
402
403 /*
404 * Ioctl routine. Compatible with BSD ioctls.
405 * There are two possible ioctls:
406 * ioctl (int fd, MTIOCGET, struct mtget *buf) -- get status
407 * ioctl (int fd, MTIOCTOP, struct mtop *buf) -- do BSD-like op
408 */
409 static int
410 wtioctl (dev_t dev, u_long cmd, caddr_t arg, int flags, struct thread *td)
411 {
412 int u = minor (dev) & WT_UNIT;
413 wtinfo_t *t = wttab + u;
414 int error, count, op;
415
416 if (u >= NWT || t->type == UNKNOWN)
417 return (ENXIO);
418
419 switch (cmd) {
420 default:
421 return (EINVAL);
422 case MTIOCIEOT: /* ignore EOT errors */
423 case MTIOCEEOT: /* enable EOT errors */
424 return (0);
425 case MTIOCGET:
426 ((struct mtget*)arg)->mt_type =
427 t->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
428 ((struct mtget*)arg)->mt_dsreg = t->flags; /* status */
429 ((struct mtget*)arg)->mt_erreg = t->error.err; /* errors */
430 ((struct mtget*)arg)->mt_resid = 0;
431 ((struct mtget*)arg)->mt_fileno = 0; /* file */
432 ((struct mtget*)arg)->mt_blkno = 0; /* block */
433 return (0);
434 case MTIOCTOP:
435 break;
436 }
437 switch ((short) ((struct mtop*)arg)->mt_op) {
438 default:
439 case MTFSR: /* forward space record */
440 case MTBSR: /* backward space record */
441 case MTBSF: /* backward space file */
442 break;
443 case MTNOP: /* no operation, sets status only */
444 case MTCACHE: /* enable controller cache */
445 case MTNOCACHE: /* disable controller cache */
446 return (0);
447 case MTREW: /* rewind */
448 case MTOFFL: /* rewind and put the drive offline */
449 if (t->flags & TPREW) /* rewind is running */
450 return (0);
451 error = wtwait (t, PCATCH, "wtorew");
452 if (error)
453 return (error);
454 wtrewind (t);
455 return (0);
456 case MTFSF: /* forward space file */
457 for (count=((struct mtop*)arg)->mt_count; count>0; --count) {
458 error = wtwait (t, PCATCH, "wtorfm");
459 if (error)
460 return (error);
461 error = wtreadfm (t);
462 if (error)
463 return (error);
464 }
465 return (0);
466 case MTWEOF: /* write an end-of-file record */
467 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
468 return (EACCES);
469 error = wtwait (t, PCATCH, "wtowfm");
470 if (error)
471 return (error);
472 error = wtwritefm (t);
473 if (error)
474 return (error);
475 return (0);
476 case MTRETENS: /* re-tension tape */
477 error = wtwait (t, PCATCH, "wtretens");
478 if (error)
479 return (error);
480 op = QIC_RETENS;
481 goto erase_retens;
482
483 case MTERASE: /* erase to EOM */
484 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
485 return (EACCES);
486 error = wtwait (t, PCATCH, "wterase");
487 if (error)
488 return (error);
489 op = QIC_ERASE;
490 erase_retens:
491 /* ERASE and RETENS operations work like REWIND. */
492 /* Simulate the rewind operation here. */
493 t->flags &= ~(TPRO | TPWO | TPVOL);
494 if (! wtcmd (t, op))
495 return (EIO);
496 t->flags |= TPSTART | TPREW;
497 t->flags |= TPWANY;
498 wtclock (t);
499 return (0);
500 }
501 return (EINVAL);
502 }
503
504 /*
505 * Strategy routine.
506 */
507 static void
508 wtstrategy (struct bio *bp)
509 {
510 int u = minor (bp->bio_dev) & WT_UNIT;
511 wtinfo_t *t = wttab + u;
512 int s;
513
514 bp->bio_resid = bp->bio_bcount;
515 if (u >= NWT || t->type == UNKNOWN) {
516 bp->bio_error = ENXIO;
517 goto err2xit;
518 }
519
520 /* at file marks and end of tape, we just return '0 bytes available' */
521 if (t->flags & TPVOL)
522 goto xit;
523
524 if (bp->bio_bcount % t->bsize != 0) {
525 bp->bio_error = EINVAL;
526 goto err2xit;
527 }
528
529 if (bp->bio_cmd == BIO_READ) {
530 /* Check read access and no previous write to this tape. */
531 if (! (t->flags & TPREAD) || (t->flags & TPWANY))
532 goto errxit;
533
534 /* For now, we assume that all data will be copied out */
535 /* If read command outstanding, just skip down */
536 if (! (t->flags & TPRO)) {
537 if (! wtsense (t, 1, TP_WRP)) /* clear status */
538 goto errxit;
539 if (! wtcmd (t, QIC_RDDATA)) { /* sed read mode */
540 wtsense (t, 1, TP_WRP);
541 goto errxit;
542 }
543 t->flags |= TPRO | TPRANY;
544 }
545 } else {
546 /* Check write access and write protection. */
547 /* No previous read from this tape allowed. */
548 if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY)))
549 goto errxit;
550
551 /* If write command outstanding, just skip down */
552 if (! (t->flags & TPWO)) {
553 if (! wtsense (t, 1, 0)) /* clear status */
554 goto errxit;
555 if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
556 wtsense (t, 1, 0);
557 goto errxit;
558 }
559 t->flags |= TPWO | TPWANY;
560 }
561 }
562
563 if (! bp->bio_bcount)
564 goto xit;
565
566 t->flags &= ~TPEXCEP;
567 s = splbio ();
568 if (wtstart (t, bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
569 bp->bio_data, bp->bio_bcount)) {
570 wtwait (t, 0, (bp->bio_cmd == BIO_READ) ? "wtread" : "wtwrite");
571 bp->bio_resid -= t->dmacount;
572 }
573 splx (s);
574
575 if (t->flags & TPEXCEP) {
576 errxit: bp->bio_error = EIO;
577 err2xit: bp->bio_flags |= BIO_ERROR;
578 }
579 xit: biodone (bp);
580 return;
581 }
582
583 /*
584 * Interrupt routine.
585 */
586 static void
587 wtintr (int u)
588 {
589 wtinfo_t *t = wttab + u;
590 unsigned char s;
591
592 if (u >= NWT || t->type == UNKNOWN) {
593 TRACE (("wtintr() -- device not configured\n"));
594 return;
595 }
596
597 s = inb (t->STATPORT); /* get status */
598 TRACE (("wtintr() status=0x%x -- ", s));
599 if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) {
600 TRACE (("busy\n"));
601 return; /* device is busy */
602 }
603
604 /*
605 * Check if rewind finished.
606 */
607 if (t->flags & TPREW) {
608 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
609 "rewind busy?\n" : "rewind finished\n"));
610 t->flags &= ~TPREW; /* Rewind finished. */
611 wtsense (t, 1, TP_WRP);
612 wakeup (t);
613 return;
614 }
615
616 /*
617 * Check if writing/reading of file mark finished.
618 */
619 if (t->flags & (TPRMARK | TPWMARK)) {
620 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
621 "marker r/w busy?\n" : "marker r/w finished\n"));
622 if (! (s & t->NOEXCEP)) /* operation failed */
623 wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0);
624 t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
625 wakeup (t);
626 return;
627 }
628
629 /*
630 * Do we started any i/o? If no, just return.
631 */
632 if (! (t->flags & TPACTIVE)) {
633 TRACE (("unexpected interrupt\n"));
634 return;
635 }
636
637 /*
638 * Clean up dma.
639 */
640 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize) {
641 /* If reading short block, copy the internal buffer
642 * to the user memory. */
643 isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan);
644 bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
645 } else
646 isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
647
648 t->flags &= ~TPACTIVE;
649 t->dmacount += t->bsize;
650 t->dmavaddr = (char *)t->dmavaddr + t->bsize;
651
652 /*
653 * On exception, check for end of file and end of volume.
654 */
655 if (! (s & t->NOEXCEP)) {
656 TRACE (("i/o exception\n"));
657 wtsense (t, 1, (t->dmaflags & ISADMA_READ) ? TP_WRP : 0);
658 if (t->error.err & (TP_EOM | TP_FIL))
659 t->flags |= TPVOL; /* end of file */
660 else
661 t->flags |= TPEXCEP; /* i/o error */
662 wakeup (t);
663 return;
664 }
665
666 if (t->dmacount < t->dmatotal) { /* continue i/o */
667 wtdma (t);
668 TRACE (("continue i/o, %d\n", t->dmacount));
669 return;
670 }
671 if (t->dmacount > t->dmatotal) /* short last block */
672 t->dmacount = t->dmatotal;
673 wakeup (t); /* wake up user level */
674 TRACE (("i/o finished, %d\n", t->dmacount));
675 }
676
677 /* start the rewind operation */
678 static void
679 wtrewind (wtinfo_t *t)
680 {
681 int rwmode = (t->flags & (TPRO | TPWO));
682
683 t->flags &= ~(TPRO | TPWO | TPVOL);
684 /*
685 * Wangtek strictly follows QIC-02 standard:
686 * clearing ONLINE in read/write modes causes rewind.
687 * REWIND command is not allowed in read/write mode
688 * and gives `illegal command' error.
689 */
690 if (t->type==WANGTEK && rwmode) {
691 outb (t->CTLPORT, 0);
692 } else if (! wtcmd (t, QIC_REWIND))
693 return;
694 t->flags |= TPSTART | TPREW;
695 wtclock (t);
696 }
697
698 /* start the `read marker' operation */
699 static int
700 wtreadfm (wtinfo_t *t)
701 {
702 t->flags &= ~(TPRO | TPWO | TPVOL);
703 if (! wtcmd (t, QIC_READFM)) {
704 wtsense (t, 1, TP_WRP);
705 return (EIO);
706 }
707 t->flags |= TPRMARK | TPRANY;
708 wtclock (t);
709 /* Don't wait for completion here. */
710 return (0);
711 }
712
713 /* write marker to the tape */
714 static int
715 wtwritefm (wtinfo_t *t)
716 {
717 tsleep (wtwritefm, WTPRI, "wtwfm", hz); /* timeout: 1 second */
718 t->flags &= ~(TPRO | TPWO);
719 if (! wtcmd (t, QIC_WRITEFM)) {
720 wtsense (t, 1, 0);
721 return (EIO);
722 }
723 t->flags |= TPWMARK | TPWANY;
724 wtclock (t);
725 return (wtwait (t, 0, "wtwfm"));
726 }
727
728 /* while controller status & mask == bits continue waiting */
729 static int
730 wtpoll (wtinfo_t *t, int mask, int bits)
731 {
732 int s, i;
733
734 /* Poll status port, waiting for specified bits. */
735 for (i=0; i<1000; ++i) { /* up to 1 msec */
736 s = inb (t->STATPORT);
737 if ((s & mask) != bits)
738 return (s);
739 DELAY (1);
740 }
741 for (i=0; i<100; ++i) { /* up to 10 msec */
742 s = inb (t->STATPORT);
743 if ((s & mask) != bits)
744 return (s);
745 DELAY (100);
746 }
747 for (;;) { /* forever */
748 s = inb (t->STATPORT);
749 if ((s & mask) != bits)
750 return (s);
751 tsleep (wtpoll, WTPRI, "wtpoll", 1); /* timeout: 1 tick */
752 }
753 }
754
755 /* execute QIC command */
756 static int
757 wtcmd (wtinfo_t *t, int cmd)
758 {
759 int s, x;
760
761 TRACE (("wtcmd() cmd=0x%x\n", cmd));
762 x = splbio();
763 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
764 if (! (s & t->NOEXCEP)) { /* error */
765 splx(x);
766 return (0);
767 }
768
769 outb (t->CMDPORT, cmd); /* output the command */
770
771 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
772 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
773 outb (t->CTLPORT, t->IEN | t->ONLINE); /* reset request */
774 wtpoll (t, t->BUSY, 0); /* wait for not ready */
775 splx(x);
776 return (1);
777 }
778
779 /* wait for the end of i/o, seeking marker or rewind operation */
780 static int
781 wtwait (wtinfo_t *t, int catch, char *msg)
782 {
783 int error;
784
785 TRACE (("wtwait() `%s'\n", msg));
786 while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) {
787 error = tsleep (t, WTPRI | catch, msg, 0);
788 if (error)
789 return (error);
790 }
791 return (0);
792 }
793
794 /* initialize dma for the i/o operation */
795 static void
796 wtdma (wtinfo_t *t)
797 {
798 t->flags |= TPACTIVE;
799 wtclock (t);
800
801 if (t->type == ARCHIVE)
802 outb (t->SDMAPORT, 0); /* set dma */
803
804 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize)
805 /* Reading short block. Do it through the internal buffer. */
806 isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan);
807 else
808 isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
809 }
810
811 /* start i/o operation */
812 static int
813 wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
814 {
815 int s, x;
816
817 TRACE (("wtstart()\n"));
818 x = splbio();
819 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
820 if (! (s & t->NOEXCEP)) {
821 t->flags |= TPEXCEP; /* error */
822 splx(x);
823 return (0);
824 }
825 t->flags &= ~TPEXCEP; /* clear exception flag */
826 t->dmavaddr = vaddr;
827 t->dmatotal = len;
828 t->dmacount = 0;
829 t->dmaflags = flags;
830 wtdma (t);
831 splx(x);
832 return (1);
833 }
834
835 /* start timer */
836 static void
837 wtclock (wtinfo_t *t)
838 {
839 if (! (t->flags & TPTIMER)) {
840 t->flags |= TPTIMER;
841 /* Some controllers seem to lose dma interrupts too often.
842 * To make the tape stream we need 1 tick timeout. */
843 timeout (wtimer, (caddr_t)t, (t->flags & TPACTIVE) ? 1 : hz);
844 }
845 }
846
847 /*
848 * Simulate an interrupt periodically while i/o is going.
849 * This is necessary in case interrupts get eaten due to
850 * multiple devices on a single IRQ line.
851 */
852 static void
853 wtimer (void *xt)
854 {
855 wtinfo_t *t = (wtinfo_t *)xt;
856 int s;
857
858 t->flags &= ~TPTIMER;
859 if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
860 return;
861
862 /* If i/o going, simulate interrupt. */
863 s = splbio ();
864 if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) {
865 TRACE (("wtimer() -- "));
866 wtintr (t->unit);
867 }
868 splx (s);
869
870 /* Restart timer if i/o pending. */
871 if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
872 wtclock (t);
873 }
874
875 /* reset the controller */
876 static int
877 wtreset (wtinfo_t *t)
878 {
879 /* Perform QIC-02 and QIC-36 compatible reset sequence. */
880 /* Thanks to Mikael Hybsch <micke@dynas.se>. */
881 int s, i;
882
883 outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */
884 DELAY (30);
885 outb (t->CTLPORT, t->ONLINE); /* turn off reset */
886 DELAY (30);
887
888 /* Read the controller status. */
889 s = inb (t->STATPORT);
890 if (s == 0xff) /* no port at this address? */
891 return (0);
892
893 /* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
894 for (i=0; i<3000; ++i) {
895 if (! (s & t->BUSY) || ! (s & t->NOEXCEP))
896 break;
897 DELAY (1000);
898 s = inb (t->STATPORT);
899 }
900 return ((s & t->RESETMASK) == t->RESETVAL);
901 }
902
903 /* get controller status information */
904 /* return 0 if user i/o request should receive an i/o error code */
905 static int
906 wtsense (wtinfo_t *t, int verb, int ignor)
907 {
908 char *msg = 0;
909 int err;
910
911 TRACE (("wtsense() ignor=0x%x\n", ignor));
912 t->flags &= ~(TPRO | TPWO);
913 if (! wtstatus (t))
914 return (0);
915 if (! (t->error.err & TP_ST0))
916 t->error.err &= ~TP_ST0MASK;
917 if (! (t->error.err & TP_ST1))
918 t->error.err &= ~TP_ST1MASK;
919 t->error.err &= ~ignor; /* ignore certain errors */
920 err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
921 TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
922 if (! err)
923 return (1);
924 if (! verb)
925 return (0);
926
927 /* lifted from tdriver.c from Wangtek */
928 if (err & TP_USL) msg = "Drive not online";
929 else if (err & TP_CNI) msg = "No cartridge";
930 else if ((err & TP_WRP) && !(t->flags & TPWP)) {
931 msg = "Tape is write protected";
932 t->flags |= TPWP;
933 }
934 else if (err & TP_FIL) msg = 0 /*"Filemark detected"*/;
935 else if (err & TP_EOM) msg = 0 /*"End of tape"*/;
936 else if (err & TP_BNL) msg = "Block not located";
937 else if (err & TP_UDA) msg = "Unrecoverable data error";
938 else if (err & TP_NDT) msg = "No data detected";
939 else if (err & TP_ILL) msg = "Illegal command";
940 if (msg)
941 printf ("wt%d: %s\n", t->unit, msg);
942 return (0);
943 }
944
945 /* get controller status information */
946 static int
947 wtstatus (wtinfo_t *t)
948 {
949 char *p;
950 int x;
951
952 x = splbio();
953 wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
954 outb (t->CMDPORT, QIC_RDSTAT); /* send `read status' command */
955
956 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
957 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
958 outb (t->CTLPORT, t->ONLINE); /* reset request */
959 wtpoll (t, t->BUSY, 0); /* wait for not ready */
960
961 p = (char*) &t->error;
962 while (p < (char*)&t->error + 6) {
963 int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP);
964 if (! (s & t->NOEXCEP)) { /* error */
965 splx(x);
966 return (0);
967 }
968
969 *p++ = inb (t->DATAPORT); /* read status byte */
970
971 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
972 wtpoll (t, t->BUSY, 0); /* wait for not ready */
973 DELAY(20);
974 outb (t->CTLPORT, t->ONLINE); /* unset request */
975 }
976 splx(x);
977 return (1);
978 }
Cache object: e1229e20a26194b8eff293a6660c352d
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