xref: /netbsd-src/sys/dev/isa/wt.c (revision 76dfffe33547c37f8bdd446e3e4ab0f3c16cea4b) 
1 /*	$NetBSD: wt.c,v 1.36 1996/10/13 01:38:08 christos Exp $	*/
2 
3 /*
4  * Streamer tape driver.
5  * Supports Archive and Wangtek compatible QIC-02/QIC-36 boards.
6  *
7  * Copyright (C) 1993 by:
8  *	Sergey Ryzhkov <sir@kiae.su>
9  *	Serge Vakulenko <vak@zebub.msk.su>
10  *
11  * This software is distributed with NO WARRANTIES, not even the implied
12  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13  *
14  * Authors grant any other persons or organisations permission to use
15  * or modify this software as long as this message is kept with the software,
16  * all derivative works or modified versions.
17  *
18  * This driver is derived from the old 386bsd Wangtek streamer tape driver,
19  * made by Robert Baron at CMU, based on Intel sources.
20  */
21 
22 /*
23  * Copyright (c) 1989 Carnegie-Mellon University.
24  * All rights reserved.
25  *
26  * Authors: Robert Baron
27  *
28  * Permission to use, copy, modify and distribute this software and
29  * its documentation is hereby granted, provided that both the copyright
30  * notice and this permission notice appear in all copies of the
31  * software, derivative works or modified versions, and any portions
32  * thereof, and that both notices appear in supporting documentation.
33  *
34  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
35  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
36  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
37  *
38  * Carnegie Mellon requests users of this software to return to
39  *
40  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
41  *  School of Computer Science
42  *  Carnegie Mellon University
43  *  Pittsburgh PA 15213-3890
44  *
45  * any improvements or extensions that they make and grant Carnegie the
46  * rights to redistribute these changes.
47  */
48 
49 /*
50  *  Copyright 1988, 1989 by Intel Corporation
51  */
52 
53 #include <sys/param.h>
54 #include <sys/systm.h>
55 #include <sys/kernel.h>
56 #include <sys/buf.h>
57 #include <sys/fcntl.h>
58 #include <sys/malloc.h>
59 #include <sys/ioctl.h>
60 #include <sys/mtio.h>
61 #include <sys/device.h>
62 #include <sys/proc.h>
63 #include <sys/conf.h>
64 
65 #include <vm/vm_param.h>
66 
67 #include <machine/intr.h>
68 #include <machine/pio.h>
69 
70 #include <dev/isa/isavar.h>
71 #include <dev/isa/isadmavar.h>
72 #include <dev/isa/wtreg.h>
73 
74 /*
75  * Uncomment this to enable internal device tracing.
76  */
77 #define WTDBPRINT(x)		/* printf x */
78 
79 #define WTPRI			(PZERO+10)	/* sleep priority */
80 
81 /*
82  * Wangtek controller ports
83  */
84 #define WT_CTLPORT(base)	((base)+0)	/* control, write only */
85 #define WT_STATPORT(base)	((base)+0)	/* status, read only */
86 #define WT_CMDPORT(base)	((base)+1)	/* command, write only */
87 #define WT_DATAPORT(base)	((base)+1)	/* data, read only */
88 #define WT_NPORT		2		/* 2 i/o ports */
89 
90 /* status port bits */
91 #define WT_BUSY			0x01		/* not ready bit define */
92 #define WT_NOEXCEP		0x02		/* no exception bit define */
93 #define WT_RESETMASK		0x07		/* to check after reset */
94 #define WT_RESETVAL		0x05		/* state after reset */
95 
96 /* control port bits */
97 #define WT_ONLINE		0x01		/* device selected */
98 #define WT_RESET		0x02		/* reset command */
99 #define WT_REQUEST		0x04		/* request command */
100 #define WT_IEN			0x08		/* enable dma */
101 
102 /*
103  * Archive controller ports
104  */
105 #define AV_DATAPORT(base)	((base)+0)	/* data, read only */
106 #define AV_CMDPORT(base)	((base)+0)	/* command, write only */
107 #define AV_STATPORT(base)	((base)+1)	/* status, read only */
108 #define AV_CTLPORT(base)	((base)+1)	/* control, write only */
109 #define AV_SDMAPORT(base)	((base)+2)	/* start dma */
110 #define AV_RDMAPORT(base)	((base)+3)	/* reset dma */
111 #define AV_NPORT		4		/* 4 i/o ports */
112 
113 /* status port bits */
114 #define AV_BUSY			0x40		/* not ready bit define */
115 #define AV_NOEXCEP		0x20		/* no exception bit define */
116 #define AV_RESETMASK		0xf8		/* to check after reset */
117 #define AV_RESETVAL		0x50		/* state after reset */
118 
119 /* control port bits */
120 #define AV_RESET		0x80		/* reset command */
121 #define AV_REQUEST		0x40		/* request command */
122 #define AV_IEN			0x20		/* enable interrupts */
123 
124 enum wttype {
125 	UNKNOWN = 0,	/* unknown type, driver disabled */
126 	ARCHIVE,	/* Archive Viper SC499, SC402 etc */
127 	WANGTEK,	/* Wangtek */
128 };
129 
130 struct wt_softc {
131 	struct device sc_dev;
132 	void *sc_ih;
133 
134 	enum wttype type;	/* type of controller */
135 	int sc_iobase;		/* base i/o port */
136 	int chan;		/* dma channel number, 1..3 */
137 	int flags;		/* state of tape drive */
138 	unsigned dens;		/* tape density */
139 	int bsize;		/* tape block size */
140 	void *buf;		/* internal i/o buffer */
141 
142 	void *dmavaddr;		/* virtual address of dma i/o buffer */
143 	size_t dmatotal;	/* size of i/o buffer */
144 	int dmaflags;		/* i/o direction */
145 	size_t dmacount;	/* resulting length of dma i/o */
146 
147 	u_short error;		/* code for error encountered */
148 	u_short ercnt;		/* number of error blocks */
149 	u_short urcnt;		/* number of underruns */
150 
151 	int DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
152 	u_char BUSY, NOEXCEP, RESETMASK, RESETVAL, ONLINE, RESET, REQUEST, IEN;
153 };
154 
155 /* XXX: These don't belong here really */
156 cdev_decl(wt);
157 bdev_decl(wt);
158 
159 int wtwait __P((struct wt_softc *sc, int catch, char *msg));
160 int wtcmd __P((struct wt_softc *sc, int cmd));
161 int wtstart __P((struct wt_softc *sc, int flag, void *vaddr, size_t len));
162 void wtdma __P((struct wt_softc *sc));
163 void wttimer __P((void *arg));
164 void wtclock __P((struct wt_softc *sc));
165 int wtreset __P((struct wt_softc *sc));
166 int wtsense __P((struct wt_softc *sc, int verbose, int ignore));
167 int wtstatus __P((struct wt_softc *sc));
168 void wtrewind __P((struct wt_softc *sc));
169 int wtreadfm __P((struct wt_softc *sc));
170 int wtwritefm __P((struct wt_softc *sc));
171 u_char wtsoft __P((struct wt_softc *sc, int mask, int bits));
172 
173 int wtprobe __P((struct device *, void *, void *));
174 void wtattach __P((struct device *, struct device *, void *));
175 int wtintr __P((void *sc));
176 
177 struct cfattach wt_ca = {
178 	sizeof(struct wt_softc), wtprobe, wtattach
179 };
180 
181 struct cfdriver wt_cd = {
182 	NULL, "wt", DV_TAPE
183 };
184 
185 /*
186  * Probe for the presence of the device.
187  */
188 int
189 wtprobe(parent, match, aux)
190 	struct device *parent;
191 	void *match, *aux;
192 {
193 	struct wt_softc *sc = match;
194 	struct isa_attach_args *ia = aux;
195 	int iobase;
196 
197 	sc->chan = ia->ia_drq;
198 	sc->sc_iobase = iobase = ia->ia_iobase;
199 	if (sc->chan < 1 || sc->chan > 3) {
200 		printf("%s: Bad drq=%d, should be 1..3\n", sc->sc_dev.dv_xname,
201 		    sc->chan);
202 		return 0;
203 	}
204 
205 	/* Try Wangtek. */
206 	sc->type = WANGTEK;
207 	sc->CTLPORT = WT_CTLPORT(iobase);
208 	sc->STATPORT = WT_STATPORT(iobase);
209 	sc->CMDPORT = WT_CMDPORT(iobase);
210 	sc->DATAPORT = WT_DATAPORT(iobase);
211 	sc->SDMAPORT = sc->RDMAPORT = 0;
212 	sc->BUSY = WT_BUSY;		sc->NOEXCEP = WT_NOEXCEP;
213 	sc->RESETMASK = WT_RESETMASK;	sc->RESETVAL = WT_RESETVAL;
214 	sc->ONLINE = WT_ONLINE;		sc->RESET = WT_RESET;
215 	sc->REQUEST = WT_REQUEST;	sc->IEN = WT_IEN;
216 	if (wtreset(sc)) {
217 		ia->ia_iosize = WT_NPORT;
218 		return 1;
219 	}
220 
221 	/* Try Archive. */
222 	sc->type = ARCHIVE;
223 	sc->CTLPORT = AV_CTLPORT(iobase);
224 	sc->STATPORT = AV_STATPORT(iobase);
225 	sc->CMDPORT = AV_CMDPORT(iobase);
226 	sc->DATAPORT = AV_DATAPORT(iobase);
227 	sc->SDMAPORT = AV_SDMAPORT(iobase);
228 	sc->RDMAPORT = AV_RDMAPORT(iobase);
229 	sc->BUSY = AV_BUSY;		sc->NOEXCEP = AV_NOEXCEP;
230 	sc->RESETMASK = AV_RESETMASK;	sc->RESETVAL = AV_RESETVAL;
231 	sc->ONLINE = 0;			sc->RESET = AV_RESET;
232 	sc->REQUEST = AV_REQUEST;	sc->IEN = AV_IEN;
233 	if (wtreset(sc)) {
234 		ia->ia_iosize = AV_NPORT;
235 		return 1;
236 	}
237 
238 	/* Tape controller not found. */
239 	sc->type = UNKNOWN;
240 	return 0;
241 }
242 
243 /*
244  * Device is found, configure it.
245  */
246 void
247 wtattach(parent, self, aux)
248 	struct device *parent, *self;
249 	void *aux;
250 {
251 	struct wt_softc *sc = (void *)self;
252 	struct isa_attach_args *ia = aux;
253 
254 	if (sc->type == ARCHIVE) {
255 		printf(": type <Archive>\n");
256 		/* Reset DMA. */
257 		outb(sc->RDMAPORT, 0);
258 	} else
259 		printf(": type <Wangtek>\n");
260 	sc->flags = TPSTART;		/* tape is rewound */
261 	sc->dens = -1;			/* unknown density */
262 
263 	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
264 	    IPL_BIO, wtintr, sc);
265 }
266 
267 int
268 wtdump(dev, blkno, va, size)
269 	dev_t dev;
270 	daddr_t blkno;
271 	caddr_t va;
272 	size_t size;
273 {
274 
275 	/* Not implemented. */
276 	return ENXIO;
277 }
278 
279 int
280 wtsize(dev)
281 	dev_t dev;
282 {
283 
284 	/* Not implemented. */
285 	return -1;
286 }
287 
288 /*
289  * Open routine, called on every device open.
290  */
291 int
292 wtopen(dev, flag, mode, p)
293 	dev_t dev;
294 	int flag;
295 	int mode;
296 	struct proc *p;
297 {
298 	int unit = minor(dev) & T_UNIT;
299 	struct wt_softc *sc;
300 	int error;
301 
302 	if (unit >= wt_cd.cd_ndevs)
303 		return ENXIO;
304 	sc = wt_cd.cd_devs[unit];
305 	if (!sc)
306 		return ENXIO;
307 
308 	/* Check that device is not in use */
309 	if (sc->flags & TPINUSE)
310 		return EBUSY;
311 
312 	/* If the tape is in rewound state, check the status and set density. */
313 	if (sc->flags & TPSTART) {
314 		/* If rewind is going on, wait */
315 		if ((error = wtwait(sc, PCATCH, "wtrew")) != 0)
316 			return error;
317 
318 		/* Check the controller status */
319 		if (!wtsense(sc, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
320 			/* Bad status, reset the controller. */
321 			if (!wtreset(sc))
322 				return EIO;
323 			if (!wtsense(sc, 1, (flag & FWRITE) ? 0 : TP_WRP))
324 				return EIO;
325 		}
326 
327 		/* Set up tape density. */
328 		if (sc->dens != (minor(dev) & WT_DENSEL)) {
329 			int d = 0;
330 
331 			switch (minor(dev) & WT_DENSEL) {
332 			case WT_DENSDFLT:
333 			default:
334 				break;			/* default density */
335 			case WT_QIC11:
336 				d = QIC_FMT11;  break;	/* minor 010 */
337 			case WT_QIC24:
338 				d = QIC_FMT24;  break;	/* minor 020 */
339 			case WT_QIC120:
340 				d = QIC_FMT120; break;	/* minor 030 */
341 			case WT_QIC150:
342 				d = QIC_FMT150; break;	/* minor 040 */
343 			case WT_QIC300:
344 				d = QIC_FMT300; break;	/* minor 050 */
345 			case WT_QIC600:
346 				d = QIC_FMT600; break;	/* minor 060 */
347 			}
348 			if (d) {
349 				/* Change tape density. */
350 				if (!wtcmd(sc, d))
351 					return EIO;
352 				if (!wtsense(sc, 1, TP_WRP | TP_ILL))
353 					return EIO;
354 
355 				/* Check the status of the controller. */
356 				if (sc->error & TP_ILL) {
357 					printf("%s: invalid tape density\n",
358 					    sc->sc_dev.dv_xname);
359 					return ENODEV;
360 				}
361 			}
362 			sc->dens = minor(dev) & WT_DENSEL;
363 		}
364 		sc->flags &= ~TPSTART;
365 	} else if (sc->dens != (minor(dev) & WT_DENSEL))
366 		return ENXIO;
367 
368 	sc->bsize = (minor(dev) & WT_BSIZE) ? 1024 : 512;
369 	sc->buf = malloc(sc->bsize, M_TEMP, M_WAITOK);
370 
371 	sc->flags = TPINUSE;
372 	if (flag & FREAD)
373 		sc->flags |= TPREAD;
374 	if (flag & FWRITE)
375 		sc->flags |= TPWRITE;
376 	return 0;
377 }
378 
379 /*
380  * Close routine, called on last device close.
381  */
382 int
383 wtclose(dev, flags, mode, p)
384 	dev_t dev;
385 	int flags;
386 	int mode;
387 	struct proc *p;
388 {
389 	int unit = minor(dev) & T_UNIT;
390 	struct wt_softc *sc = wt_cd.cd_devs[unit];
391 
392 	/* If rewind is pending, do nothing */
393 	if (sc->flags & TPREW)
394 		goto done;
395 
396 	/* If seek forward is pending and no rewind on close, do nothing */
397 	if (sc->flags & TPRMARK) {
398 		if (minor(dev) & T_NOREWIND)
399 			goto done;
400 
401 		/* If read file mark is going on, wait */
402 		wtwait(sc, 0, "wtrfm");
403 	}
404 
405 	if (sc->flags & TPWANY) {
406 		/* Tape was written.  Write file mark. */
407 		wtwritefm(sc);
408 	}
409 
410 	if ((minor(dev) & T_NOREWIND) == 0) {
411 		/* Rewind to beginning of tape. */
412 		/* Don't wait until rewind, though. */
413 		wtrewind(sc);
414 		goto done;
415 	}
416 	if ((sc->flags & TPRANY) && (sc->flags & (TPVOL | TPWANY)) == 0) {
417 		/* Space forward to after next file mark if no writing done. */
418 		/* Don't wait for completion. */
419 		wtreadfm(sc);
420 	}
421 
422 done:
423 	sc->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
424 	free(sc->buf, M_TEMP);
425 	return 0;
426 }
427 
428 /*
429  * Ioctl routine.  Compatible with BSD ioctls.
430  * Direct QIC-02 commands ERASE and RETENSION added.
431  * There are three possible ioctls:
432  * ioctl(int fd, MTIOCGET, struct mtget *buf)	-- get status
433  * ioctl(int fd, MTIOCTOP, struct mtop *buf)	-- do BSD-like op
434  * ioctl(int fd, WTQICMD, int qicop)		-- do QIC op
435  */
436 int
437 wtioctl(dev, cmd, addr, flag, p)
438 	dev_t dev;
439 	u_long cmd;
440 	caddr_t addr;
441 	int flag;
442 	struct proc *p;
443 {
444 	int unit = minor(dev) & T_UNIT;
445 	struct wt_softc *sc = wt_cd.cd_devs[unit];
446 	int error, count, op;
447 
448 	switch (cmd) {
449 	default:
450 		return EINVAL;
451 	case WTQICMD:	/* direct QIC command */
452 		op = *(int *)addr;
453 		switch (op) {
454 		default:
455 			return EINVAL;
456 		case QIC_ERASE:		/* erase the whole tape */
457 			if ((sc->flags & TPWRITE) == 0 || (sc->flags & TPWP))
458 				return EACCES;
459 			if ((error = wtwait(sc, PCATCH, "wterase")) != 0)
460 				return error;
461 			break;
462 		case QIC_RETENS:	/* retension the tape */
463 			if ((error = wtwait(sc, PCATCH, "wtretens")) != 0)
464 				return error;
465 			break;
466 		}
467 		/* Both ERASE and RETENS operations work like REWIND. */
468 		/* Simulate the rewind operation here. */
469 		sc->flags &= ~(TPRO | TPWO | TPVOL);
470 		if (!wtcmd(sc, op))
471 			return EIO;
472 		sc->flags |= TPSTART | TPREW;
473 		if (op == QIC_ERASE)
474 			sc->flags |= TPWANY;
475 		wtclock(sc);
476 		return 0;
477 	case MTIOCIEOT:	/* ignore EOT errors */
478 	case MTIOCEEOT:	/* enable EOT errors */
479 		return 0;
480 	case MTIOCGET:
481 		((struct mtget*)addr)->mt_type =
482 			sc->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
483 		((struct mtget*)addr)->mt_dsreg = sc->flags;	/* status */
484 		((struct mtget*)addr)->mt_erreg = sc->error;	/* errors */
485 		((struct mtget*)addr)->mt_resid = 0;
486 		((struct mtget*)addr)->mt_fileno = 0;		/* file */
487 		((struct mtget*)addr)->mt_blkno = 0;		/* block */
488 		return 0;
489 	case MTIOCTOP:
490 		break;
491 	}
492 
493 	switch ((short)((struct mtop*)addr)->mt_op) {
494 	default:
495 #if 0
496 	case MTFSR:	/* forward space record */
497 	case MTBSR:	/* backward space record */
498 	case MTBSF:	/* backward space file */
499 #endif
500 		return EINVAL;
501 	case MTNOP:	/* no operation, sets status only */
502 	case MTCACHE:	/* enable controller cache */
503 	case MTNOCACHE:	/* disable controller cache */
504 		return 0;
505 	case MTREW:	/* rewind */
506 	case MTOFFL:	/* rewind and put the drive offline */
507 		if (sc->flags & TPREW)   /* rewind is running */
508 			return 0;
509 		if ((error = wtwait(sc, PCATCH, "wtorew")) != 0)
510 			return error;
511 		wtrewind(sc);
512 		return 0;
513 	case MTFSF:	/* forward space file */
514 		for (count = ((struct mtop*)addr)->mt_count; count > 0;
515 		    --count) {
516 			if ((error = wtwait(sc, PCATCH, "wtorfm")) != 0)
517 				return error;
518 			if ((error = wtreadfm(sc)) != 0)
519 				return error;
520 		}
521 		return 0;
522 	case MTWEOF:	/* write an end-of-file record */
523 		if ((sc->flags & TPWRITE) == 0 || (sc->flags & TPWP))
524 			return EACCES;
525 		if ((error = wtwait(sc, PCATCH, "wtowfm")) != 0)
526 			return error;
527 		if ((error = wtwritefm(sc)) != 0)
528 			return error;
529 		return 0;
530 	}
531 
532 #ifdef DIAGNOSTIC
533 	panic("wtioctl: impossible");
534 #endif
535 }
536 
537 /*
538  * Strategy routine.
539  */
540 void
541 wtstrategy(bp)
542 	struct buf *bp;
543 {
544 	int unit = minor(bp->b_dev) & T_UNIT;
545 	struct wt_softc *sc = wt_cd.cd_devs[unit];
546 	int s;
547 
548 	bp->b_resid = bp->b_bcount;
549 
550 	/* at file marks and end of tape, we just return '0 bytes available' */
551 	if (sc->flags & TPVOL)
552 		goto xit;
553 
554 	if (bp->b_flags & B_READ) {
555 		/* Check read access and no previous write to this tape. */
556 		if ((sc->flags & TPREAD) == 0 || (sc->flags & TPWANY))
557 			goto errxit;
558 
559 		/* For now, we assume that all data will be copied out */
560 		/* If read command outstanding, just skip down */
561 		if ((sc->flags & TPRO) == 0) {
562 			if (!wtsense(sc, 1, TP_WRP)) {
563 				/* Clear status. */
564 				goto errxit;
565 			}
566 			if (!wtcmd(sc, QIC_RDDATA)) {
567 				/* Set read mode. */
568 				wtsense(sc, 1, TP_WRP);
569 				goto errxit;
570 			}
571 			sc->flags |= TPRO | TPRANY;
572 		}
573 	} else {
574 		/* Check write access and write protection. */
575 		/* No previous read from this tape allowed. */
576 		if ((sc->flags & TPWRITE) == 0 || (sc->flags & (TPWP | TPRANY)))
577 			goto errxit;
578 
579 		/* If write command outstanding, just skip down */
580 		if ((sc->flags & TPWO) == 0) {
581 			if (!wtsense(sc, 1, 0)) {
582 				/* Clear status. */
583 				goto errxit;
584 			}
585 			if (!wtcmd(sc, QIC_WRTDATA)) {
586 				/* Set write mode. */
587 				wtsense(sc, 1, 0);
588 				goto errxit;
589 			}
590 			sc->flags |= TPWO | TPWANY;
591 		}
592 	}
593 
594 	if (bp->b_bcount == 0)
595 		goto xit;
596 
597 	sc->flags &= ~TPEXCEP;
598 	s = splbio();
599 	if (wtstart(sc, bp->b_flags, bp->b_data, bp->b_bcount)) {
600 		wtwait(sc, 0, (bp->b_flags & B_READ) ? "wtread" : "wtwrite");
601 		bp->b_resid -= sc->dmacount;
602 	}
603 	splx(s);
604 
605 	if (sc->flags & TPEXCEP) {
606 errxit:
607 		bp->b_flags |= B_ERROR;
608 		bp->b_error = EIO;
609 	}
610 xit:
611 	biodone(bp);
612 	return;
613 }
614 
615 int
616 wtread(dev, uio, flags)
617 	dev_t dev;
618 	struct uio *uio;
619 	int flags;
620 {
621 
622 	return (physio(wtstrategy, NULL, dev, B_READ, minphys, uio));
623 }
624 
625 int
626 wtwrite(dev, uio, flags)
627 	dev_t dev;
628 	struct uio *uio;
629 	int flags;
630 {
631 
632 	return (physio(wtstrategy, NULL, dev, B_WRITE, minphys, uio));
633 }
634 
635 /*
636  * Interrupt routine.
637  */
638 int
639 wtintr(arg)
640 	void *arg;
641 {
642 	struct wt_softc *sc = arg;
643 	u_char x;
644 
645 	x = inb(sc->STATPORT);			/* get status */
646 	WTDBPRINT(("wtintr() status=0x%x -- ", x));
647 	if ((x & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP)) {
648 		WTDBPRINT(("busy\n"));
649 		return 0;			/* device is busy */
650 	}
651 
652 	/*
653 	 * Check if rewind finished.
654 	 */
655 	if (sc->flags & TPREW) {
656 		WTDBPRINT(((x & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP) ?
657 		    "rewind busy?\n" : "rewind finished\n"));
658 		sc->flags &= ~TPREW;		/* rewind finished */
659 		wtsense(sc, 1, TP_WRP);
660 		wakeup((caddr_t)sc);
661 		return 1;
662 	}
663 
664 	/*
665 	 * Check if writing/reading of file mark finished.
666 	 */
667 	if (sc->flags & (TPRMARK | TPWMARK)) {
668 		WTDBPRINT(((x & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP) ?
669 		    "marker r/w busy?\n" : "marker r/w finished\n"));
670 		if ((x & sc->NOEXCEP) == 0)	/* operation failed */
671 			wtsense(sc, 1, (sc->flags & TPRMARK) ? TP_WRP : 0);
672 		sc->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
673 		wakeup((caddr_t)sc);
674 		return 1;
675 	}
676 
677 	/*
678 	 * Do we started any i/o?  If no, just return.
679 	 */
680 	if ((sc->flags & TPACTIVE) == 0) {
681 		WTDBPRINT(("unexpected interrupt\n"));
682 		return 0;
683 	}
684 	sc->flags &= ~TPACTIVE;
685 	sc->dmacount += sc->bsize;		/* increment counter */
686 
687 	/*
688 	 * Clean up dma.
689 	 */
690 	if ((sc->dmaflags & DMAMODE_READ) &&
691 	    (sc->dmatotal - sc->dmacount) < sc->bsize) {
692 		/* If reading short block, copy the internal buffer
693 		 * to the user memory. */
694 		isa_dmadone(sc->dmaflags, sc->buf, sc->bsize, sc->chan);
695 		bcopy(sc->buf, sc->dmavaddr, sc->dmatotal - sc->dmacount);
696 	} else
697 		isa_dmadone(sc->dmaflags, sc->dmavaddr, sc->bsize, sc->chan);
698 
699 	/*
700 	 * On exception, check for end of file and end of volume.
701 	 */
702 	if ((x & sc->NOEXCEP) == 0) {
703 		WTDBPRINT(("i/o exception\n"));
704 		wtsense(sc, 1, (sc->dmaflags & DMAMODE_READ) ? TP_WRP : 0);
705 		if (sc->error & (TP_EOM | TP_FIL))
706 			sc->flags |= TPVOL;	/* end of file */
707 		else
708 			sc->flags |= TPEXCEP;	/* i/o error */
709 		wakeup((caddr_t)sc);
710 		return 1;
711 	}
712 
713 	if (sc->dmacount < sc->dmatotal) {
714 		/* Continue I/O. */
715 		sc->dmavaddr += sc->bsize;
716 		wtdma(sc);
717 		WTDBPRINT(("continue i/o, %d\n", sc->dmacount));
718 		return 1;
719 	}
720 	if (sc->dmacount > sc->dmatotal)	/* short last block */
721 		sc->dmacount = sc->dmatotal;
722 	/* Wake up user level. */
723 	wakeup((caddr_t)sc);
724 	WTDBPRINT(("i/o finished, %d\n", sc->dmacount));
725 	return 1;
726 }
727 
728 /* start the rewind operation */
729 void
730 wtrewind(sc)
731 	struct wt_softc *sc;
732 {
733 	int rwmode = sc->flags & (TPRO | TPWO);
734 
735 	sc->flags &= ~(TPRO | TPWO | TPVOL);
736 	/*
737 	 * Wangtek strictly follows QIC-02 standard:
738 	 * clearing ONLINE in read/write modes causes rewind.
739 	 * REWIND command is not allowed in read/write mode
740 	 * and gives `illegal command' error.
741 	 */
742 	if (sc->type == WANGTEK && rwmode) {
743 		outb(sc->CTLPORT, 0);
744 	} else if (!wtcmd(sc, QIC_REWIND))
745 		return;
746 	sc->flags |= TPSTART | TPREW;
747 	wtclock(sc);
748 }
749 
750 /*
751  * Start the `read marker' operation.
752  */
753 int
754 wtreadfm(sc)
755 	struct wt_softc *sc;
756 {
757 
758 	sc->flags &= ~(TPRO | TPWO | TPVOL);
759 	if (!wtcmd(sc, QIC_READFM)) {
760 		wtsense(sc, 1, TP_WRP);
761 		return EIO;
762 	}
763 	sc->flags |= TPRMARK | TPRANY;
764 	wtclock(sc);
765 	/* Don't wait for completion here. */
766 	return 0;
767 }
768 
769 /*
770  * Write marker to the tape.
771  */
772 int
773 wtwritefm(sc)
774 	struct wt_softc *sc;
775 {
776 
777 	tsleep((caddr_t)wtwritefm, WTPRI, "wtwfm", hz);
778 	sc->flags &= ~(TPRO | TPWO);
779 	if (!wtcmd(sc, QIC_WRITEFM)) {
780 		wtsense(sc, 1, 0);
781 		return EIO;
782 	}
783 	sc->flags |= TPWMARK | TPWANY;
784 	wtclock(sc);
785 	return wtwait(sc, 0, "wtwfm");
786 }
787 
788 /*
789  * While controller status & mask == bits continue waiting.
790  */
791 u_char
792 wtsoft(sc, mask, bits)
793 	struct wt_softc *sc;
794 	int mask, bits;
795 {
796 	u_char x;
797 	int i;
798 
799 	/* Poll status port, waiting for specified bits. */
800 	for (i = 0; i < 1000; ++i) {	/* up to 1 msec */
801 		x = inb(sc->STATPORT);
802 		if ((x & mask) != bits)
803 			return x;
804 		delay(1);
805 	}
806 	for (i = 0; i < 100; ++i) {	/* up to 10 msec */
807 		x = inb(sc->STATPORT);
808 		if ((x & mask) != bits)
809 			return x;
810 		delay(100);
811 	}
812 	for (;;) {			/* forever */
813 		x = inb(sc->STATPORT);
814 		if ((x & mask) != bits)
815 			return x;
816 		tsleep((caddr_t)wtsoft, WTPRI, "wtsoft", 1);
817 	}
818 }
819 
820 /*
821  * Execute QIC command.
822  */
823 int
824 wtcmd(sc, cmd)
825 	struct wt_softc *sc;
826 	int cmd;
827 {
828 	u_char x;
829 	int s;
830 
831 	WTDBPRINT(("wtcmd() cmd=0x%x\n", cmd));
832 	s = splbio();
833 	x = wtsoft(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
834 	if ((x & sc->NOEXCEP) == 0) {			/* error */
835 		splx(s);
836 		return 0;
837 	}
838 
839 	outb(sc->CMDPORT, cmd);				/* output the command */
840 
841 	outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE);	/* set request */
842 	wtsoft(sc, sc->BUSY, sc->BUSY);			/* wait for ready */
843 	outb(sc->CTLPORT, sc->IEN | sc->ONLINE);	/* reset request */
844 	wtsoft(sc, sc->BUSY, 0);			/* wait for not ready */
845 	splx(s);
846 	return 1;
847 }
848 
849 /* wait for the end of i/o, seeking marker or rewind operation */
850 int
851 wtwait(sc, catch, msg)
852 	struct wt_softc *sc;
853 	int catch;
854 	char *msg;
855 {
856 	int error;
857 
858 	WTDBPRINT(("wtwait() `%s'\n", msg));
859 	while (sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
860 		if ((error = tsleep((caddr_t)sc, WTPRI | catch, msg, 0)) != 0)
861 			return error;
862 	return 0;
863 }
864 
865 /* initialize dma for the i/o operation */
866 void
867 wtdma(sc)
868 	struct wt_softc *sc;
869 {
870 
871 	sc->flags |= TPACTIVE;
872 	wtclock(sc);
873 
874 	if (sc->type == ARCHIVE) {
875 		/* Set DMA. */
876 		outb(sc->SDMAPORT, 0);
877 	}
878 
879 	if ((sc->dmaflags & DMAMODE_READ) &&
880 	    (sc->dmatotal - sc->dmacount) < sc->bsize) {
881 		/* Reading short block; do it through the internal buffer. */
882 		isa_dmastart(sc->dmaflags, sc->buf, sc->bsize, sc->chan);
883 	} else
884 		isa_dmastart(sc->dmaflags, sc->dmavaddr, sc->bsize, sc->chan);
885 }
886 
887 /* start i/o operation */
888 int
889 wtstart(sc, flag, vaddr, len)
890 	struct wt_softc *sc;
891 	int flag;
892 	void *vaddr;
893 	size_t len;
894 {
895 	u_char x;
896 
897 	WTDBPRINT(("wtstart()\n"));
898 	x = wtsoft(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
899 	if ((x & sc->NOEXCEP) == 0) {
900 		sc->flags |= TPEXCEP;	/* error */
901 		return 0;
902 	}
903 	sc->flags &= ~TPEXCEP;		/* clear exception flag */
904 	sc->dmavaddr = vaddr;
905 	sc->dmatotal = len;
906 	sc->dmacount = 0;
907 	sc->dmaflags = flag & B_READ ? DMAMODE_READ : DMAMODE_WRITE;
908 	wtdma(sc);
909 	return 1;
910 }
911 
912 /*
913  * Start timer.
914  */
915 void
916 wtclock(sc)
917 	struct wt_softc *sc;
918 {
919 
920 	if (sc->flags & TPTIMER)
921 		return;
922 	sc->flags |= TPTIMER;
923 	/*
924 	 * Some controllers seem to lose dma interrupts too often.  To make the
925 	 * tape stream we need 1 tick timeout.
926 	 */
927 	timeout(wttimer, sc, (sc->flags & TPACTIVE) ? 1 : hz);
928 }
929 
930 /*
931  * Simulate an interrupt periodically while i/o is going.
932  * This is necessary in case interrupts get eaten due to
933  * multiple devices on a single IRQ line.
934  */
935 void
936 wttimer(arg)
937 	void *arg;
938 {
939 	struct wt_softc *sc = (struct wt_softc *)arg;
940 	int s;
941 
942 	sc->flags &= ~TPTIMER;
943 	if ((sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) == 0)
944 		return;
945 
946 	/* If i/o going, simulate interrupt. */
947 	s = splbio();
948 	if ((inb(sc->STATPORT) & (sc->BUSY | sc->NOEXCEP)) != (sc->BUSY | sc->NOEXCEP)) {
949 		WTDBPRINT(("wttimer() -- "));
950 		wtintr(sc);
951 	}
952 	splx(s);
953 
954 	/* Restart timer if i/o pending. */
955 	if (sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
956 		wtclock(sc);
957 }
958 
959 /*
960  * Perform QIC-02 and QIC-36 compatible reset sequence.
961  */
962 int
963 wtreset(sc)
964 	struct wt_softc *sc;
965 {
966 	u_char x;
967 	int i;
968 
969 	outb(sc->CTLPORT, sc->RESET | sc->ONLINE); /* send reset */
970 	delay(30);
971 	outb(sc->CTLPORT, sc->ONLINE);	/* turn off reset */
972 	delay(30);
973 
974 	/* Read the controller status. */
975 	x = inb(sc->STATPORT);
976 	if (x == 0xff)			/* no port at this address? */
977 		return 0;
978 
979 	/* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
980 	for (i = 0; i < 3000; ++i) {
981 		if ((x & sc->BUSY) == 0 || (x & sc->NOEXCEP) == 0)
982 			break;
983 		delay(1000);
984 		x = inb(sc->STATPORT);
985 	}
986 	return (x & sc->RESETMASK) == sc->RESETVAL;
987 }
988 
989 /*
990  * Get controller status information.  Return 0 if user i/o request should
991  * receive an i/o error code.
992  */
993 int
994 wtsense(sc, verbose, ignore)
995 	struct wt_softc *sc;
996 	int verbose, ignore;
997 {
998 	char *msg = 0;
999 	int error;
1000 
1001 	WTDBPRINT(("wtsense() ignore=0x%x\n", ignore));
1002 	sc->flags &= ~(TPRO | TPWO);
1003 	if (!wtstatus(sc))
1004 		return 0;
1005 	if ((sc->error & TP_ST0) == 0)
1006 		sc->error &= ~TP_ST0MASK;
1007 	if ((sc->error & TP_ST1) == 0)
1008 		sc->error &= ~TP_ST1MASK;
1009 	sc->error &= ~ignore;	/* ignore certain errors */
1010 	error = sc->error & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
1011 	    TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
1012 	if (!error)
1013 		return 1;
1014 	if (!verbose)
1015 		return 0;
1016 
1017 	/* lifted from tdriver.c from Wangtek */
1018 	if (error & TP_USL)
1019 		msg = "Drive not online";
1020 	else if (error & TP_CNI)
1021 		msg = "No cartridge";
1022 	else if ((error & TP_WRP) && (sc->flags & TPWP) == 0) {
1023 		msg = "Tape is write protected";
1024 		sc->flags |= TPWP;
1025 	} else if (error & TP_FIL)
1026 		msg = 0 /*"Filemark detected"*/;
1027 	else if (error & TP_EOM)
1028 		msg = 0 /*"End of tape"*/;
1029 	else if (error & TP_BNL)
1030 		msg = "Block not located";
1031 	else if (error & TP_UDA)
1032 		msg = "Unrecoverable data error";
1033 	else if (error & TP_NDT)
1034 		msg = "No data detected";
1035 	else if (error & TP_ILL)
1036 		msg = "Illegal command";
1037 	if (msg)
1038 		printf("%s: %s\n", sc->sc_dev.dv_xname, msg);
1039 	return 0;
1040 }
1041 
1042 /*
1043  * Get controller status information.
1044  */
1045 int
1046 wtstatus(sc)
1047 	struct wt_softc *sc;
1048 {
1049 	char *p;
1050 	int s;
1051 
1052 	s = splbio();
1053 	wtsoft(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
1054 	outb(sc->CMDPORT, QIC_RDSTAT);	/* send `read status' command */
1055 
1056 	outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE);	/* set request */
1057 	wtsoft(sc, sc->BUSY, sc->BUSY);			/* wait for ready */
1058 	outb(sc->CTLPORT, sc->ONLINE);			/* reset request */
1059 	wtsoft(sc, sc->BUSY, 0);			/* wait for not ready */
1060 
1061 	p = (char *)&sc->error;
1062 	while (p < (char *)&sc->error + 6) {
1063 		u_char x = wtsoft(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP);
1064 		if ((x & sc->NOEXCEP) == 0) {	/* error */
1065 			splx(s);
1066 			return 0;
1067 		}
1068 
1069 		*p++ = inb(sc->DATAPORT);	/* read status byte */
1070 
1071 		outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE); /* set request */
1072 		wtsoft(sc, sc->BUSY, 0);	/* wait for not ready */
1073 		outb(sc->CTLPORT, sc->ONLINE);	/* unset request */
1074 	}
1075 	splx(s);
1076 	return 1;
1077 }
1078