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Remove bogus checks after kmalloc(M_WAITOK) which never returns NULL.
[dragonfly.git] / sys / dev / disk / wt / wt.c
blobcb2437ae0da8b1de2e789bf608143ad9b006d682
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: src/sys/i386/isa/wt.c,v 1.57.2.1 2000/08/08 19:49:53 peter Exp $
24 * $DragonFly: src/sys/dev/disk/wt/wt.c,v 1.20 2008/01/06 16:55:49 swildner Exp $
25 *
26 */
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 "use_wt.h"
62
63 #include <sys/param.h>
64 #include <sys/systm.h>
65 #include <sys/kernel.h>
66 #include <sys/buf.h>
67 #include <sys/fcntl.h>
68 #include <sys/malloc.h>
69 #include <sys/mtio.h>
70 #include <sys/conf.h>
71 #include <sys/thread2.h>
72 #include <sys/bus.h>
73
74 #include <machine/clock.h>
75
76 #include <bus/isa/i386/isa_device.h>
77 #include <bus/isa/isavar.h>
78 #include "wtreg.h"
79
80
81 /*
82 * Uncomment this to enable internal device tracing.
83 */
84 #define TRACE(s) /* kprintf s */
85
86 /*
87 * Wangtek controller ports
88 */
89 #define WT_CTLPORT(base) ((base)+0) /* control, write only */
90 #define WT_STATPORT(base) ((base)+0) /* status, read only */
91 #define WT_CMDPORT(base) ((base)+1) /* command, write only */
92 #define WT_DATAPORT(base) ((base)+1) /* data, read only */
93 #define WT_NPORT 2 /* 2 i/o ports */
94
95 /* status port bits */
96 #define WT_BUSY 0x01 /* not ready bit define */
97 #define WT_NOEXCEP 0x02 /* no exception bit define */
98 #define WT_RESETMASK 0x07 /* to check after reset */
99 #define WT_RESETVAL 0x05 /* state after reset */
100
101 /* control port bits */
102 #define WT_ONLINE 0x01 /* device selected */
103 #define WT_RESET 0x02 /* reset command */
104 #define WT_REQUEST 0x04 /* request command */
105 #define WT_IEN 0x08 /* enable dma */
106
107 /*
108 * Archive controller ports
109 */
110 #define AV_DATAPORT(base) ((base)+0) /* data, read only */
111 #define AV_CMDPORT(base) ((base)+0) /* command, write only */
112 #define AV_STATPORT(base) ((base)+1) /* status, read only */
113 #define AV_CTLPORT(base) ((base)+1) /* control, write only */
114 #define AV_SDMAPORT(base) ((base)+2) /* start dma */
115 #define AV_RDMAPORT(base) ((base)+3) /* reset dma */
116 #define AV_NPORT 4 /* 4 i/o ports */
117
118 /* status port bits */
119 #define AV_BUSY 0x40 /* not ready bit define */
120 #define AV_NOEXCEP 0x20 /* no exception bit define */
121 #define AV_RESETMASK 0xf8 /* to check after reset */
122 #define AV_RESETVAL 0x50 /* state after reset */
123
124 /* control port bits */
125 #define AV_RESET 0x80 /* reset command */
126 #define AV_REQUEST 0x40 /* request command */
127 #define AV_IEN 0x20 /* enable interrupts */
128
129 enum wttype {
130 UNKNOWN = 0, /* unknown type, driver disabled */
131 ARCHIVE, /* Archive Viper SC499, SC402 etc */
132 WANGTEK /* Wangtek */
133 };
134
135 typedef struct {
136 unsigned short err; /* code for error encountered */
137 unsigned short ercnt; /* number of error blocks */
138 unsigned short urcnt; /* number of underruns */
139 } wtstatus_t;
140
141 typedef struct {
142 enum wttype type; /* type of controller */
143 unsigned unit; /* unit number */
144 unsigned port; /* base i/o port */
145 unsigned chan; /* dma channel number, 1..3 */
146 unsigned flags; /* state of tape drive */
147 unsigned dens; /* tape density */
148 int bsize; /* tape block size */
149 void *buf; /* internal i/o buffer */
150
151 void *dmavaddr; /* virtual address of dma i/o buffer */
152 unsigned dmatotal; /* size of i/o buffer */
153 unsigned dmaflags; /* i/o direction, ISADMA_READ or ISADMA_WRITE */
154 unsigned dmacount; /* resulting length of dma i/o */
155
156 wtstatus_t error; /* status of controller */
157
158 unsigned short DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
159 unsigned char BUSY, NOEXCEP, RESETMASK, RESETVAL;
160 unsigned char ONLINE, RESET, REQUEST, IEN;
161 struct callout timeout_ch;
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 flags, 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 void wtintr(void *);
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 dev_ops wt_ops = {
189 { "wt", CDEV_MAJOR, 0 },
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 };
197
198
199 /*
200 * Probe for the presence of the device.
201 */
202 static int
203 wtprobe (struct isa_device *id)
204 {
205 wtinfo_t *t = wttab + id->id_unit;
206
207 callout_init(&t->timeout_ch);
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 kprintf ("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_intr = (inthand2_t *)wtintr;
254 if (t->type == ARCHIVE) {
255 kprintf ("wt%d: type <Archive>\n", t->unit);
256 outb (t->RDMAPORT, 0); /* reset dma */
257 } else
258 kprintf ("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 dev_ops_add(&wt_ops, -1, id->id_unit);
264 make_dev(&wt_ops, id->id_unit, 0, 0, 0600, "rwt%d", id->id_unit);
265 return (1);
266 }
267
268 struct isa_driver wtdriver = { wtprobe, wtattach, "wt", };
269
270 /*
271 * Open routine, called on every device open.
272 */
273 static int
274 wtopen (struct dev_open_args *ap)
275 {
276 cdev_t dev = ap->a_head.a_dev;
277 int u = minor (dev) & T_UNIT;
278 wtinfo_t *t = wttab + u;
279 int error;
280
281 if (u >= NWT || t->type == UNKNOWN)
282 return (ENXIO);
283
284 /* Check that device is not in use */
285 if (t->flags & TPINUSE)
286 return (EBUSY);
287
288 /* If the tape is in rewound state, check the status and set density. */
289 if (t->flags & TPSTART) {
290 /* If rewind is going on, wait */
291 error = wtwait (t, PCATCH, "wtrew");
292 if (error)
293 return (error);
294
295 /* Check the controller status */
296 if (! wtsense (t, 0, (ap->a_oflags & FWRITE) ? 0 : TP_WRP)) {
297 /* Bad status, reset the controller */
298 if (! wtreset (t))
299 return (EIO);
300 if (! wtsense (t, 1, (ap->a_oflags & FWRITE) ? 0 : TP_WRP))
301 return (EIO);
302 }
303
304 /* Set up tape density. */
305 if (t->dens != (minor (dev) & WT_DENSEL)) {
306 int d = 0;
307
308 switch (minor (dev) & WT_DENSEL) {
309 case WT_DENSDFLT: default: break; /* default density */
310 case WT_QIC11: d = QIC_FMT11; break; /* minor 010 */
311 case WT_QIC24: d = QIC_FMT24; break; /* minor 020 */
312 case WT_QIC120: d = QIC_FMT120; break; /* minor 030 */
313 case WT_QIC150: d = QIC_FMT150; break; /* minor 040 */
314 case WT_QIC300: d = QIC_FMT300; break; /* minor 050 */
315 case WT_QIC600: d = QIC_FMT600; break; /* minor 060 */
316 }
317 if (d) {
318 /* Change tape density. */
319 if (! wtcmd (t, d))
320 return (EIO);
321 if (! wtsense (t, 1, TP_WRP | TP_ILL))
322 return (EIO);
323
324 /* Check the status of the controller. */
325 if (t->error.err & TP_ILL) {
326 kprintf ("wt%d: invalid tape density\n", t->unit);
327 return (ENODEV);
328 }
329 }
330 t->dens = minor (dev) & WT_DENSEL;
331 }
332 t->flags &= ~TPSTART;
333 } else if (t->dens != (minor (dev) & WT_DENSEL))
334 return (ENXIO);
335
336 t->bsize = (minor (dev) & WT_BSIZE) ? 1024 : 512;
337 t->buf = kmalloc (t->bsize, M_TEMP, M_WAITOK);
338
339 if (isa_dma_acquire(t->chan))
340 return(EBUSY);
341
342 t->flags = TPINUSE;
343
344 if (ap->a_oflags & FREAD)
345 t->flags |= TPREAD;
346 if (ap->a_oflags & FWRITE)
347 t->flags |= TPWRITE;
348 return (0);
349 }
350
351 /*
352 * Close routine, called on last device close.
353 */
354 static int
355 wtclose (struct dev_close_args *ap)
356 {
357 cdev_t dev = ap->a_head.a_dev;
358 int u = minor (dev) & T_UNIT;
359 wtinfo_t *t = wttab + u;
360
361 if (u >= NWT || t->type == UNKNOWN)
362 return (ENXIO);
363
364 /* If rewind is pending, do nothing */
365 if (t->flags & TPREW)
366 goto done;
367
368 /* If seek forward is pending and no rewind on close, do nothing */
369 if (t->flags & TPRMARK) {
370 if (minor (dev) & T_NOREWIND)
371 goto done;
372
373 /* If read file mark is going on, wait */
374 wtwait (t, 0, "wtrfm");
375 }
376
377 if (t->flags & TPWANY)
378 /* Tape was written. Write file mark. */
379 wtwritefm (t);
380
381 if (! (minor (dev) & T_NOREWIND)) {
382 /* Rewind tape to beginning of tape. */
383 /* Don't wait until rewind, though. */
384 wtrewind (t);
385 goto done;
386 }
387 if ((t->flags & TPRANY) && ! (t->flags & (TPVOL | TPWANY)))
388 /* Space forward to after next file mark if no writing done. */
389 /* Don't wait for completion. */
390 wtreadfm (t);
391 done:
392 t->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
393 kfree (t->buf, M_TEMP);
394 isa_dma_release(t->chan);
395 return (0);
396 }
397
398 /*
399 * Ioctl routine. Compatible with BSD ioctls.
400 * There are two possible ioctls:
401 * ioctl (int fd, MTIOCGET, struct mtget *buf) -- get status
402 * ioctl (int fd, MTIOCTOP, struct mtop *buf) -- do BSD-like op
403 */
404 static int
405 wtioctl (struct dev_ioctl_args *ap)
406 {
407 cdev_t dev = ap->a_head.a_dev;
408 caddr_t arg = ap->a_data;
409 int u = minor (dev) & T_UNIT;
410 wtinfo_t *t = wttab + u;
411 int error, count, op;
412
413 if (u >= NWT || t->type == UNKNOWN)
414 return (ENXIO);
415
416 switch (ap->a_cmd) {
417 default:
418 return (EINVAL);
419 case MTIOCIEOT: /* ignore EOT errors */
420 case MTIOCEEOT: /* enable EOT errors */
421 return (0);
422 case MTIOCGET:
423 ((struct mtget*)arg)->mt_type =
424 t->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
425 ((struct mtget*)arg)->mt_dsreg = t->flags; /* status */
426 ((struct mtget*)arg)->mt_erreg = t->error.err; /* errors */
427 ((struct mtget*)arg)->mt_resid = 0;
428 ((struct mtget*)arg)->mt_fileno = 0; /* file */
429 ((struct mtget*)arg)->mt_blkno = 0; /* block */
430 return (0);
431 case MTIOCTOP:
432 break;
433 }
434 switch ((short) ((struct mtop*)arg)->mt_op) {
435 default:
436 case MTFSR: /* forward space record */
437 case MTBSR: /* backward space record */
438 case MTBSF: /* backward space file */
439 break;
440 case MTNOP: /* no operation, sets status only */
441 case MTCACHE: /* enable controller cache */
442 case MTNOCACHE: /* disable controller cache */
443 return (0);
444 case MTREW: /* rewind */
445 case MTOFFL: /* rewind and put the drive offline */
446 if (t->flags & TPREW) /* rewind is running */
447 return (0);
448 error = wtwait (t, PCATCH, "wtorew");
449 if (error)
450 return (error);
451 wtrewind (t);
452 return (0);
453 case MTFSF: /* forward space file */
454 for (count=((struct mtop*)arg)->mt_count; count>0; --count) {
455 error = wtwait (t, PCATCH, "wtorfm");
456 if (error)
457 return (error);
458 error = wtreadfm (t);
459 if (error)
460 return (error);
461 }
462 return (0);
463 case MTWEOF: /* write an end-of-file record */
464 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
465 return (EACCES);
466 error = wtwait (t, PCATCH, "wtowfm");
467 if (error)
468 return (error);
469 error = wtwritefm (t);
470 if (error)
471 return (error);
472 return (0);
473 case MTRETENS: /* re-tension tape */
474 error = wtwait (t, PCATCH, "wtretens");
475 if (error)
476 return (error);
477 op = QIC_RETENS;
478 goto erase_retens;
479
480 case MTERASE: /* erase to EOM */
481 if (! (t->flags & TPWRITE) || (t->flags & TPWP))
482 return (EACCES);
483 error = wtwait (t, PCATCH, "wterase");
484 if (error)
485 return (error);
486 op = QIC_ERASE;
487 erase_retens:
488 /* ERASE and RETENS operations work like REWIND. */
489 /* Simulate the rewind operation here. */
490 t->flags &= ~(TPRO | TPWO | TPVOL);
491 if (! wtcmd (t, op))
492 return (EIO);
493 t->flags |= TPSTART | TPREW;
494 t->flags |= TPWANY;
495 wtclock (t);
496 return (0);
497 }
498 return (EINVAL);
499 }
500
501 /*
502 * Strategy routine.
503 */
504 static int
505 wtstrategy (struct dev_strategy_args *ap)
506 {
507 cdev_t dev = ap->a_head.a_dev;
508 struct bio *bio = ap->a_bio;
509 struct buf *bp = bio->bio_buf;
510 int u = minor(dev) & T_UNIT;
511 wtinfo_t *t = wttab + u;
512 unsigned flags;
513
514 bp->b_resid = bp->b_bcount;
515 if (u >= NWT || t->type == UNKNOWN) {
516 bp->b_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->b_bcount % t->bsize != 0) {
525 bp->b_error = EINVAL;
526 goto err2xit;
527 }
528
529 if (bp->b_cmd == BUF_CMD_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 flags = ISADMA_READ;
546 } else {
547 /* Check write access and write protection. */
548 /* No previous read from this tape allowed. */
549 if (! (t->flags & TPWRITE) || (t->flags & (TPWP | TPRANY)))
550 goto errxit;
551
552 /* If write command outstanding, just skip down */
553 if (! (t->flags & TPWO)) {
554 if (! wtsense (t, 1, 0)) /* clear status */
555 goto errxit;
556 if (! wtcmd (t, QIC_WRTDATA)) { /* set write mode */
557 wtsense (t, 1, 0);
558 goto errxit;
559 }
560 t->flags |= TPWO | TPWANY;
561 }
562 flags = ISADMA_WRITE;
563 }
564
565 if (! bp->b_bcount)
566 goto xit;
567
568 t->flags &= ~TPEXCEP;
569 crit_enter();
570 if (wtstart (t, flags, bp->b_data, bp->b_bcount)) {
571 wtwait (t, 0, (flags & ISADMA_READ) ? "wtread" : "wtwrite");
572 bp->b_resid -= t->dmacount;
573 }
574 crit_exit();
575
576 if (t->flags & TPEXCEP) {
577 errxit: bp->b_error = EIO;
578 err2xit: bp->b_flags |= B_ERROR;
579 }
580 xit: biodone (bio);
581 return(0);
582 }
583
584 /*
585 * Interrupt routine.
586 */
587 static void
588 wtintr (void *arg)
589 {
590 int u = (int)arg;
591 wtinfo_t *t = wttab + u;
592 unsigned char s;
593
594 if (u >= NWT || t->type == UNKNOWN) {
595 TRACE (("wtintr() -- device not configured\n"));
596 return;
597 }
598
599 s = inb (t->STATPORT); /* get status */
600 TRACE (("wtintr() status=0x%x -- ", s));
601 if ((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP)) {
602 TRACE (("busy\n"));
603 return; /* device is busy */
604 }
605
606 /*
607 * Check if rewind finished.
608 */
609 if (t->flags & TPREW) {
610 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
611 "rewind busy?\n" : "rewind finished\n"));
612 t->flags &= ~TPREW; /* Rewind finished. */
613 wtsense (t, 1, TP_WRP);
614 wakeup ((caddr_t)t);
615 return;
616 }
617
618 /*
619 * Check if writing/reading of file mark finished.
620 */
621 if (t->flags & (TPRMARK | TPWMARK)) {
622 TRACE (((s & (t->BUSY | t->NOEXCEP)) == (t->BUSY | t->NOEXCEP) ?
623 "marker r/w busy?\n" : "marker r/w finished\n"));
624 if (! (s & t->NOEXCEP)) /* operation failed */
625 wtsense (t, 1, (t->flags & TPRMARK) ? TP_WRP : 0);
626 t->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
627 wakeup ((caddr_t)t);
628 return;
629 }
630
631 /*
632 * Do we started any i/o? If no, just return.
633 */
634 if (! (t->flags & TPACTIVE)) {
635 TRACE (("unexpected interrupt\n"));
636 return;
637 }
638
639 /*
640 * Clean up dma.
641 */
642 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize) {
643 /* If reading short block, copy the internal buffer
644 * to the user memory. */
645 isa_dmadone (t->dmaflags, t->buf, t->bsize, t->chan);
646 bcopy (t->buf, t->dmavaddr, t->dmatotal - t->dmacount);
647 } else
648 isa_dmadone (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
649
650 t->flags &= ~TPACTIVE;
651 t->dmacount += t->bsize;
652 t->dmavaddr = (char *)t->dmavaddr + t->bsize;
653
654 /*
655 * On exception, check for end of file and end of volume.
656 */
657 if (! (s & t->NOEXCEP)) {
658 TRACE (("i/o exception\n"));
659 wtsense (t, 1, (t->dmaflags & ISADMA_READ) ? TP_WRP : 0);
660 if (t->error.err & (TP_EOM | TP_FIL))
661 t->flags |= TPVOL; /* end of file */
662 else
663 t->flags |= TPEXCEP; /* i/o error */
664 wakeup ((caddr_t)t);
665 return;
666 }
667
668 if (t->dmacount < t->dmatotal) { /* continue i/o */
669 wtdma (t);
670 TRACE (("continue i/o, %d\n", t->dmacount));
671 return;
672 }
673 if (t->dmacount > t->dmatotal) /* short last block */
674 t->dmacount = t->dmatotal;
675 wakeup ((caddr_t)t); /* wake up user level */
676 TRACE (("i/o finished, %d\n", t->dmacount));
677 }
678
679 /* start the rewind operation */
680 static void
681 wtrewind (wtinfo_t *t)
682 {
683 int rwmode = (t->flags & (TPRO | TPWO));
684
685 t->flags &= ~(TPRO | TPWO | TPVOL);
686 /*
687 * Wangtek strictly follows QIC-02 standard:
688 * clearing ONLINE in read/write modes causes rewind.
689 * REWIND command is not allowed in read/write mode
690 * and gives `illegal command' error.
691 */
692 if (t->type==WANGTEK && rwmode) {
693 outb (t->CTLPORT, 0);
694 } else if (! wtcmd (t, QIC_REWIND))
695 return;
696 t->flags |= TPSTART | TPREW;
697 wtclock (t);
698 }
699
700 /* start the `read marker' operation */
701 static int
702 wtreadfm (wtinfo_t *t)
703 {
704 t->flags &= ~(TPRO | TPWO | TPVOL);
705 if (! wtcmd (t, QIC_READFM)) {
706 wtsense (t, 1, TP_WRP);
707 return (EIO);
708 }
709 t->flags |= TPRMARK | TPRANY;
710 wtclock (t);
711 /* Don't wait for completion here. */
712 return (0);
713 }
714
715 /* write marker to the tape */
716 static int
717 wtwritefm (wtinfo_t *t)
718 {
719 tsleep ((caddr_t)wtwritefm, 0, "wtwfm", hz); /* timeout: 1 second */
720 t->flags &= ~(TPRO | TPWO);
721 if (! wtcmd (t, QIC_WRITEFM)) {
722 wtsense (t, 1, 0);
723 return (EIO);
724 }
725 t->flags |= TPWMARK | TPWANY;
726 wtclock (t);
727 return (wtwait (t, 0, "wtwfm"));
728 }
729
730 /* while controller status & mask == bits continue waiting */
731 static int
732 wtpoll (wtinfo_t *t, int mask, int bits)
733 {
734 int s, i;
735
736 /* Poll status port, waiting for specified bits. */
737 for (i=0; i<1000; ++i) { /* up to 1 msec */
738 s = inb (t->STATPORT);
739 if ((s & mask) != bits)
740 return (s);
741 DELAY (1);
742 }
743 for (i=0; i<100; ++i) { /* up to 10 msec */
744 s = inb (t->STATPORT);
745 if ((s & mask) != bits)
746 return (s);
747 DELAY (100);
748 }
749 for (;;) { /* forever */
750 s = inb (t->STATPORT);
751 if ((s & mask) != bits)
752 return (s);
753 tsleep ((caddr_t)wtpoll, 0, "wtpoll", 1); /* timeout: 1 tick */
754 }
755 }
756
757 /* execute QIC command */
758 static int
759 wtcmd (wtinfo_t *t, int cmd)
760 {
761 int s;
762
763 TRACE (("wtcmd() cmd=0x%x\n", cmd));
764 crit_enter();
765 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
766 if (! (s & t->NOEXCEP)) { /* error */
767 crit_exit();
768 return (0);
769 }
770
771 outb (t->CMDPORT, cmd); /* output the command */
772
773 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
774 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
775 outb (t->CTLPORT, t->IEN | t->ONLINE); /* reset request */
776 wtpoll (t, t->BUSY, 0); /* wait for not ready */
777 crit_exit();
778 return (1);
779 }
780
781 /* wait for the end of i/o, seeking marker or rewind operation */
782 static int
783 wtwait (wtinfo_t *t, int catch, char *msg)
784 {
785 int error;
786
787 TRACE (("wtwait() `%s'\n", msg));
788 while (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) {
789 error = tsleep ((caddr_t)t, catch, msg, 0);
790 if (error)
791 return (error);
792 }
793 return (0);
794 }
795
796 /* initialize dma for the i/o operation */
797 static void
798 wtdma (wtinfo_t *t)
799 {
800 t->flags |= TPACTIVE;
801 wtclock (t);
802
803 if (t->type == ARCHIVE)
804 outb (t->SDMAPORT, 0); /* set dma */
805
806 if ((t->dmaflags & ISADMA_READ) && (t->dmatotal - t->dmacount) < t->bsize)
807 /* Reading short block. Do it through the internal buffer. */
808 isa_dmastart (t->dmaflags, t->buf, t->bsize, t->chan);
809 else
810 isa_dmastart (t->dmaflags, t->dmavaddr, t->bsize, t->chan);
811 }
812
813 /* start i/o operation */
814 static int
815 wtstart (wtinfo_t *t, unsigned flags, void *vaddr, unsigned len)
816 {
817 int s;
818
819 TRACE (("wtstart()\n"));
820 crit_enter();
821 s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
822 if (! (s & t->NOEXCEP)) {
823 t->flags |= TPEXCEP; /* error */
824 crit_exit();
825 return (0);
826 }
827 t->flags &= ~TPEXCEP; /* clear exception flag */
828 t->dmavaddr = vaddr;
829 t->dmatotal = len;
830 t->dmacount = 0;
831 t->dmaflags = flags;
832 wtdma (t);
833 crit_exit();
834 return (1);
835 }
836
837 /* start timer */
838 static void
839 wtclock (wtinfo_t *t)
840 {
841 if (! (t->flags & TPTIMER)) {
842 t->flags |= TPTIMER;
843 /* Some controllers seem to lose dma interrupts too often.
844 * To make the tape stream we need 1 tick timeout. */
845 callout_reset(&t->timeout_ch, ((t->flags & TPACTIVE) ? 1 : hz),
846 wtimer, t);
847 }
848 }
849
850 /*
851 * Simulate an interrupt periodically while i/o is going.
852 * This is necessary in case interrupts get eaten due to
853 * multiple devices on a single IRQ line.
854 */
855 static void
856 wtimer (void *xt)
857 {
858 wtinfo_t *t = (wtinfo_t *)xt;
859
860 t->flags &= ~TPTIMER;
861 if (! (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)))
862 return;
863
864 /* If i/o going, simulate interrupt. */
865 crit_enter();
866 if ((inb (t->STATPORT) & (t->BUSY | t->NOEXCEP)) != (t->BUSY | t->NOEXCEP)) {
867 TRACE (("wtimer() -- "));
868 wtintr ((void *)t->unit);
869 }
870 crit_exit();
871
872 /* Restart timer if i/o pending. */
873 if (t->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
874 wtclock (t);
875 }
876
877 /* reset the controller */
878 static int
879 wtreset (wtinfo_t *t)
880 {
881 /* Perform QIC-02 and QIC-36 compatible reset sequence. */
882 /* Thanks to Mikael Hybsch <micke@dynas.se>. */
883 int s, i;
884
885 outb (t->CTLPORT, t->RESET | t->ONLINE); /* send reset */
886 DELAY (30);
887 outb (t->CTLPORT, t->ONLINE); /* turn off reset */
888 DELAY (30);
889
890 /* Read the controller status. */
891 s = inb (t->STATPORT);
892 if (s == 0xff) /* no port at this address? */
893 return (0);
894
895 /* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
896 for (i=0; i<3000; ++i) {
897 if (! (s & t->BUSY) || ! (s & t->NOEXCEP))
898 break;
899 DELAY (1000);
900 s = inb (t->STATPORT);
901 }
902 return ((s & t->RESETMASK) == t->RESETVAL);
903 }
904
905 /* get controller status information */
906 /* return 0 if user i/o request should receive an i/o error code */
907 static int
908 wtsense (wtinfo_t *t, int verb, int ignor)
909 {
910 char *msg = 0;
911 int err;
912
913 TRACE (("wtsense() ignor=0x%x\n", ignor));
914 t->flags &= ~(TPRO | TPWO);
915 if (! wtstatus (t))
916 return (0);
917 if (! (t->error.err & TP_ST0))
918 t->error.err &= ~TP_ST0MASK;
919 if (! (t->error.err & TP_ST1))
920 t->error.err &= ~TP_ST1MASK;
921 t->error.err &= ~ignor; /* ignore certain errors */
922 err = t->error.err & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
923 TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
924 if (! err)
925 return (1);
926 if (! verb)
927 return (0);
928
929 /* lifted from tdriver.c from Wangtek */
930 if (err & TP_USL) msg = "Drive not online";
931 else if (err & TP_CNI) msg = "No cartridge";
932 else if ((err & TP_WRP) && !(t->flags & TPWP)) {
933 msg = "Tape is write protected";
934 t->flags |= TPWP;
935 }
936 else if (err & TP_FIL) msg = 0 /*"Filemark detected"*/;
937 else if (err & TP_EOM) msg = 0 /*"End of tape"*/;
938 else if (err & TP_BNL) msg = "Block not located";
939 else if (err & TP_UDA) msg = "Unrecoverable data error";
940 else if (err & TP_NDT) msg = "No data detected";
941 else if (err & TP_ILL) msg = "Illegal command";
942 if (msg)
943 kprintf ("wt%d: %s\n", t->unit, msg);
944 return (0);
945 }
946
947 /* get controller status information */
948 static int
949 wtstatus (wtinfo_t *t)
950 {
951 char *p;
952
953 crit_enter();
954 wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP); /* ready? */
955 outb (t->CMDPORT, QIC_RDSTAT); /* send `read status' command */
956
957 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
958 wtpoll (t, t->BUSY, t->BUSY); /* wait for ready */
959 outb (t->CTLPORT, t->ONLINE); /* reset request */
960 wtpoll (t, t->BUSY, 0); /* wait for not ready */
961
962 p = (char*) &t->error;
963 while (p < (char*)&t->error + 6) {
964 int s = wtpoll (t, t->BUSY | t->NOEXCEP, t->BUSY | t->NOEXCEP);
965 if (! (s & t->NOEXCEP)) { /* error */
966 crit_exit();
967 return (0);
968 }
969
970 *p++ = inb (t->DATAPORT); /* read status byte */
971
972 outb (t->CTLPORT, t->REQUEST | t->ONLINE); /* set request */
973 wtpoll (t, t->BUSY, 0); /* wait for not ready */
974 DELAY(20);
975 outb (t->CTLPORT, t->ONLINE); /* unset request */
976 }
977 crit_exit();
978 return (1);
979 }
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