1 /*	$OpenBSD: wt.c,v 1.16 2002/05/24 13:31:11 art Exp $	*/
2 /*	$NetBSD: wt.c,v 1.33 1996/05/12 23:54:22 mycroft Exp $	*/
3 
4 /*
5  * Streamer tape driver.
6  * Supports Archive and Wangtek compatible QIC-02/QIC-36 boards.
7  *
8  * Copyright (C) 1993 by:
9  *	Sergey Ryzhkov <sir@kiae.su>
10  *	Serge Vakulenko <vak@zebub.msk.su>
11  *
12  * This software is distributed with NO WARRANTIES, not even the implied
13  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14  *
15  * Authors grant any other persons or organisations permission to use
16  * or modify this software as long as this message is kept with the software,
17  * all derivative works or modified versions.
18  *
19  * This driver is derived from the old 386bsd Wangtek streamer tape driver,
20  * made by Robert Baron at CMU, based on Intel sources.
21  */
22 
23 /*
24  * Copyright (c) 1989 Carnegie-Mellon University.
25  * All rights reserved.
26  *
27  * Authors: Robert Baron
28  *
29  * Permission to use, copy, modify and distribute this software and
30  * its documentation is hereby granted, provided that both the copyright
31  * notice and this permission notice appear in all copies of the
32  * software, derivative works or modified versions, and any portions
33  * thereof, and that both notices appear in supporting documentation.
34  *
35  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
36  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
37  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
38  *
39  * Carnegie Mellon requests users of this software to return to
40  *
41  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
42  *  School of Computer Science
43  *  Carnegie Mellon University
44  *  Pittsburgh PA 15213-3890
45  *
46  * any improvements or extensions that they make and grant Carnegie the
47  * rights to redistribute these changes.
48  */
49 
50 /*
51  *  Copyright 1988, 1989 by Intel Corporation
52  */
53 
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/kernel.h>
57 #include <sys/buf.h>
58 #include <sys/fcntl.h>
59 #include <sys/malloc.h>
60 #include <sys/ioctl.h>
61 #include <sys/mtio.h>
62 #include <sys/device.h>
63 #include <sys/proc.h>
64 #include <sys/conf.h>
65 #include <sys/timeout.h>
66 
67 #include <uvm/uvm_param.h>
68 
69 #include <machine/intr.h>
70 #include <machine/pio.h>
71 
72 #include <dev/isa/isavar.h>
73 #include <dev/isa/isadmavar.h>
74 #include <dev/isa/wtreg.h>
75 
76 /*
77  * Uncomment this to enable internal device tracing.
78  */
79 #define WTDBPRINT(x)		/* printf x */
80 
81 #define WTPRI			(PZERO+10)	/* sleep priority */
82 
83 /*
84  * Wangtek controller ports
85  */
86 #define WT_CTLPORT(base)	((base)+0)	/* control, write only */
87 #define WT_STATPORT(base)	((base)+0)	/* status, read only */
88 #define WT_CMDPORT(base)	((base)+1)	/* command, write only */
89 #define WT_DATAPORT(base)	((base)+1)	/* data, read only */
90 #define WT_NPORT		2		/* 2 i/o ports */
91 
92 /* status port bits */
93 #define WT_BUSY			0x01		/* not ready bit define */
94 #define WT_NOEXCEP		0x02		/* no exception bit define */
95 #define WT_RESETMASK		0x07		/* to check after reset */
96 #define WT_RESETVAL		0x05		/* state after reset */
97 
98 /* control port bits */
99 #define WT_ONLINE		0x01		/* device selected */
100 #define WT_RESET		0x02		/* reset command */
101 #define WT_REQUEST		0x04		/* request command */
102 #define WT_IEN			0x08		/* enable dma */
103 
104 /*
105  * Archive controller ports
106  */
107 #define AV_DATAPORT(base)	((base)+0)	/* data, read only */
108 #define AV_CMDPORT(base)	((base)+0)	/* command, write only */
109 #define AV_STATPORT(base)	((base)+1)	/* status, read only */
110 #define AV_CTLPORT(base)	((base)+1)	/* control, write only */
111 #define AV_SDMAPORT(base)	((base)+2)	/* start dma */
112 #define AV_RDMAPORT(base)	((base)+3)	/* reset dma */
113 #define AV_NPORT		4		/* 4 i/o ports */
114 
115 /* status port bits */
116 #define AV_BUSY			0x40		/* not ready bit define */
117 #define AV_NOEXCEP		0x20		/* no exception bit define */
118 #define AV_RESETMASK		0xf8		/* to check after reset */
119 #define AV_RESETVAL		0x50		/* state after reset */
120 
121 /* control port bits */
122 #define AV_RESET		0x80		/* reset command */
123 #define AV_REQUEST		0x40		/* request command */
124 #define AV_IEN			0x20		/* enable interrupts */
125 
126 enum wttype {
127 	UNKNOWN = 0,	/* unknown type, driver disabled */
128 	ARCHIVE,	/* Archive Viper SC499, SC402 etc */
129 	WANGTEK,	/* Wangtek */
130 };
131 
132 struct wt_softc {
133 	struct device sc_dev;
134 	void *sc_ih;
135 	struct timeout sc_tmo;
136 
137 	enum wttype type;	/* type of controller */
138 	int sc_iobase;		/* base i/o port */
139 	int chan;		/* dma channel number, 1..3 */
140 	int flags;		/* state of tape drive */
141 	unsigned dens;		/* tape density */
142 	int bsize;		/* tape block size */
143 	void *buf;		/* internal i/o buffer */
144 
145 	void *dmavaddr;		/* virtual address of dma i/o buffer */
146 	size_t dmatotal;	/* size of i/o buffer */
147 	int dmaflags;		/* i/o direction */
148 	size_t dmacount;	/* resulting length of dma i/o */
149 
150 	u_short error;		/* code for error encountered */
151 	u_short ercnt;		/* number of error blocks */
152 	u_short urcnt;		/* number of underruns */
153 
154 	int DATAPORT, CMDPORT, STATPORT, CTLPORT, SDMAPORT, RDMAPORT;
155 	u_char BUSY, NOEXCEP, RESETMASK, RESETVAL, ONLINE, RESET, REQUEST, IEN;
156 };
157 
158 /* XXX: These don't belong here really */
159 cdev_decl(wt);
160 bdev_decl(wt);
161 
162 int wtwait(struct wt_softc *sc, int catch, char *msg);
163 int wtcmd(struct wt_softc *sc, int cmd);
164 int wtstart(struct wt_softc *sc, int flag, void *vaddr, size_t len);
165 void wtdma(struct wt_softc *sc);
166 void wttimer(void *arg);
167 void wtclock(struct wt_softc *sc);
168 int wtreset(struct wt_softc *sc);
169 int wtsense(struct wt_softc *sc, int verbose, int ignore);
170 int wtstatus(struct wt_softc *sc);
171 void wtrewind(struct wt_softc *sc);
172 int wtreadfm(struct wt_softc *sc);
173 int wtwritefm(struct wt_softc *sc);
174 u_char wtpoll(struct wt_softc *sc, int mask, int bits);
175 
176 int wtprobe(struct device *, void *, void *);
177 void wtattach(struct device *, struct device *, void *);
178 int wtintr(void *sc);
179 
180 struct cfattach wt_ca = {
181 	sizeof(struct wt_softc), wtprobe, wtattach
182 };
183 
184 struct cfdriver wt_cd = {
185 	NULL, "wt", DV_TAPE
186 };
187 
188 /*
189  * Probe for the presence of the device.
190  */
191 int
wtprobe(parent,match,aux)192 wtprobe(parent, match, aux)
193 	struct device *parent;
194 	void *match, *aux;
195 {
196 	struct wt_softc *sc = match;
197 	struct isa_attach_args *ia = aux;
198 	int iobase;
199 
200 	sc->chan = ia->ia_drq;
201 	sc->sc_iobase = iobase = ia->ia_iobase;
202 	if (sc->chan < 1 || sc->chan > 3) {
203 		printf("%s: Bad drq=%d, should be 1..3\n", sc->sc_dev.dv_xname,
204 		    sc->chan);
205 		return 0;
206 	}
207 
208 	/* Try Wangtek. */
209 	sc->type = WANGTEK;
210 	sc->CTLPORT = WT_CTLPORT(iobase);
211 	sc->STATPORT = WT_STATPORT(iobase);
212 	sc->CMDPORT = WT_CMDPORT(iobase);
213 	sc->DATAPORT = WT_DATAPORT(iobase);
214 	sc->SDMAPORT = sc->RDMAPORT = 0;
215 	sc->BUSY = WT_BUSY;		sc->NOEXCEP = WT_NOEXCEP;
216 	sc->RESETMASK = WT_RESETMASK;	sc->RESETVAL = WT_RESETVAL;
217 	sc->ONLINE = WT_ONLINE;		sc->RESET = WT_RESET;
218 	sc->REQUEST = WT_REQUEST;	sc->IEN = WT_IEN;
219 	if (wtreset(sc)) {
220 		ia->ia_iosize = WT_NPORT;
221 		return 1;
222 	}
223 
224 	/* Try Archive. */
225 	sc->type = ARCHIVE;
226 	sc->CTLPORT = AV_CTLPORT(iobase);
227 	sc->STATPORT = AV_STATPORT(iobase);
228 	sc->CMDPORT = AV_CMDPORT(iobase);
229 	sc->DATAPORT = AV_DATAPORT(iobase);
230 	sc->SDMAPORT = AV_SDMAPORT(iobase);
231 	sc->RDMAPORT = AV_RDMAPORT(iobase);
232 	sc->BUSY = AV_BUSY;		sc->NOEXCEP = AV_NOEXCEP;
233 	sc->RESETMASK = AV_RESETMASK;	sc->RESETVAL = AV_RESETVAL;
234 	sc->ONLINE = 0;			sc->RESET = AV_RESET;
235 	sc->REQUEST = AV_REQUEST;	sc->IEN = AV_IEN;
236 	if (wtreset(sc)) {
237 		ia->ia_iosize = AV_NPORT;
238 		return 1;
239 	}
240 
241 	/* Tape controller not found. */
242 	sc->type = UNKNOWN;
243 	return 0;
244 }
245 
246 /*
247  * Device is found, configure it.
248  */
249 void
wtattach(parent,self,aux)250 wtattach(parent, self, aux)
251 	struct device *parent, *self;
252 	void *aux;
253 {
254 	struct wt_softc *sc = (void *)self;
255 	struct isa_attach_args *ia = aux;
256 
257 	if (sc->type == ARCHIVE) {
258 		printf(": type <Archive>\n");
259 		/* Reset DMA. */
260 		outb(sc->RDMAPORT, 0);
261 	} else
262 		printf(": type <Wangtek>\n");
263 	sc->flags = TPSTART;		/* tape is rewound */
264 	sc->dens = -1;			/* unknown density */
265 
266 	timeout_set(&sc->sc_tmo, wttimer, sc);
267 	sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
268 	    IPL_BIO, wtintr, sc, sc->sc_dev.dv_xname);
269 }
270 
271 int
wtdump(dev,blkno,va,size)272 wtdump(dev, blkno, va, size)
273 	dev_t dev;
274 	daddr_t blkno;
275 	caddr_t va;
276 	size_t size;
277 {
278 
279 	/* Not implemented. */
280 	return ENXIO;
281 }
282 
283 int
wtsize(dev)284 wtsize(dev)
285 	dev_t dev;
286 {
287 
288 	/* Not implemented. */
289 	return -1;
290 }
291 
292 /*
293  * Open routine, called on every device open.
294  */
295 int
wtopen(dev,flag,mode,p)296 wtopen(dev, flag, mode, p)
297 	dev_t dev;
298 	int flag;
299 	int mode;
300 	struct proc *p;
301 {
302 	int unit = minor(dev) & T_UNIT;
303 	struct wt_softc *sc;
304 	int error;
305 
306 	if (unit >= wt_cd.cd_ndevs)
307 		return ENXIO;
308 	sc = wt_cd.cd_devs[unit];
309 	if (!sc)
310 		return ENXIO;
311 
312 	/* Check that device is not in use */
313 	if (sc->flags & TPINUSE)
314 		return EBUSY;
315 
316 	/* If the tape is in rewound state, check the status and set density. */
317 	if (sc->flags & TPSTART) {
318 		/* If rewind is going on, wait */
319 		if ((error = wtwait(sc, PCATCH, "wtrew")) != 0)
320 			return error;
321 
322 		/* Check the controller status */
323 		if (!wtsense(sc, 0, (flag & FWRITE) ? 0 : TP_WRP)) {
324 			/* Bad status, reset the controller. */
325 			if (!wtreset(sc))
326 				return EIO;
327 			if (!wtsense(sc, 1, (flag & FWRITE) ? 0 : TP_WRP))
328 				return EIO;
329 		}
330 
331 		/* Set up tape density. */
332 		if (sc->dens != (minor(dev) & WT_DENSEL)) {
333 			int d = 0;
334 
335 			switch (minor(dev) & WT_DENSEL) {
336 			case WT_DENSDFLT:
337 			default:
338 				break;			/* default density */
339 			case WT_QIC11:
340 				d = QIC_FMT11;  break;	/* minor 010 */
341 			case WT_QIC24:
342 				d = QIC_FMT24;  break;	/* minor 020 */
343 			case WT_QIC120:
344 				d = QIC_FMT120; break;	/* minor 030 */
345 			case WT_QIC150:
346 				d = QIC_FMT150; break;	/* minor 040 */
347 			case WT_QIC300:
348 				d = QIC_FMT300; break;	/* minor 050 */
349 			case WT_QIC600:
350 				d = QIC_FMT600; break;	/* minor 060 */
351 			}
352 			if (d) {
353 				/* Change tape density. */
354 				if (!wtcmd(sc, d))
355 					return EIO;
356 				if (!wtsense(sc, 1, TP_WRP | TP_ILL))
357 					return EIO;
358 
359 				/* Check the status of the controller. */
360 				if (sc->error & TP_ILL) {
361 					printf("%s: invalid tape density\n",
362 					    sc->sc_dev.dv_xname);
363 					return ENODEV;
364 				}
365 			}
366 			sc->dens = minor(dev) & WT_DENSEL;
367 		}
368 		sc->flags &= ~TPSTART;
369 	} else if (sc->dens != (minor(dev) & WT_DENSEL))
370 		return ENXIO;
371 
372 	sc->bsize = (minor(dev) & WT_BSIZE) ? 1024 : 512;
373 	sc->buf = malloc(sc->bsize, M_TEMP, M_WAITOK);
374 
375 	sc->flags = TPINUSE;
376 	if (flag & FREAD)
377 		sc->flags |= TPREAD;
378 	if (flag & FWRITE)
379 		sc->flags |= TPWRITE;
380 	return 0;
381 }
382 
383 /*
384  * Close routine, called on last device close.
385  */
386 int
wtclose(dev,flags,mode,p)387 wtclose(dev, flags, mode, p)
388 	dev_t dev;
389 	int flags;
390 	int mode;
391 	struct proc *p;
392 {
393 	int unit = minor(dev) & T_UNIT;
394 	struct wt_softc *sc = wt_cd.cd_devs[unit];
395 
396 	/* If rewind is pending, do nothing */
397 	if (sc->flags & TPREW)
398 		goto done;
399 
400 	/* If seek forward is pending and no rewind on close, do nothing */
401 	if (sc->flags & TPRMARK) {
402 		if (minor(dev) & T_NOREWIND)
403 			goto done;
404 
405 		/* If read file mark is going on, wait */
406 		wtwait(sc, 0, "wtrfm");
407 	}
408 
409 	if (sc->flags & TPWANY) {
410 		/* Tape was written.  Write file mark. */
411 		wtwritefm(sc);
412 	}
413 
414 	if ((minor(dev) & T_NOREWIND) == 0) {
415 		/* Rewind to beginning of tape. */
416 		/* Don't wait until rewind, though. */
417 		wtrewind(sc);
418 		goto done;
419 	}
420 	if ((sc->flags & TPRANY) && (sc->flags & (TPVOL | TPWANY)) == 0) {
421 		/* Space forward to after next file mark if no writing done. */
422 		/* Don't wait for completion. */
423 		wtreadfm(sc);
424 	}
425 
426 done:
427 	sc->flags &= TPREW | TPRMARK | TPSTART | TPTIMER;
428 	free(sc->buf, M_TEMP);
429 	return 0;
430 }
431 
432 /*
433  * Ioctl routine.  Compatible with BSD ioctls.
434  * Direct QIC-02 commands ERASE and RETENSION added.
435  * There are three possible ioctls:
436  * ioctl(int fd, MTIOCGET, struct mtget *buf)	-- get status
437  * ioctl(int fd, MTIOCTOP, struct mtop *buf)	-- do BSD-like op
438  * ioctl(int fd, WTQICMD, int qicop)		-- do QIC op
439  */
440 int
wtioctl(dev,cmd,addr,flag,p)441 wtioctl(dev, cmd, addr, flag, p)
442 	dev_t dev;
443 	u_long cmd;
444 	caddr_t addr;
445 	int flag;
446 	struct proc *p;
447 {
448 	int unit = minor(dev) & T_UNIT;
449 	struct wt_softc *sc = wt_cd.cd_devs[unit];
450 	int error, count, op;
451 
452 	switch (cmd) {
453 	default:
454 		return EINVAL;
455 	case WTQICMD:	/* direct QIC command */
456 		op = *(int *)addr;
457 		switch (op) {
458 		default:
459 			return EINVAL;
460 		case QIC_ERASE:		/* erase the whole tape */
461 			if ((sc->flags & TPWRITE) == 0 || (sc->flags & TPWP))
462 				return EACCES;
463 			if ((error = wtwait(sc, PCATCH, "wterase")) != 0)
464 				return error;
465 			break;
466 		case QIC_RETENS:	/* retension the tape */
467 			if ((error = wtwait(sc, PCATCH, "wtretens")) != 0)
468 				return error;
469 			break;
470 		}
471 		/* Both ERASE and RETENS operations work like REWIND. */
472 		/* Simulate the rewind operation here. */
473 		sc->flags &= ~(TPRO | TPWO | TPVOL);
474 		if (!wtcmd(sc, op))
475 			return EIO;
476 		sc->flags |= TPSTART | TPREW;
477 		if (op == QIC_ERASE)
478 			sc->flags |= TPWANY;
479 		wtclock(sc);
480 		return 0;
481 	case MTIOCIEOT:	/* ignore EOT errors */
482 	case MTIOCEEOT:	/* enable EOT errors */
483 		return 0;
484 	case MTIOCGET:
485 		((struct mtget*)addr)->mt_type =
486 			sc->type == ARCHIVE ? MT_ISVIPER1 : 0x11;
487 		((struct mtget*)addr)->mt_dsreg = sc->flags;	/* status */
488 		((struct mtget*)addr)->mt_erreg = sc->error;	/* errors */
489 		((struct mtget*)addr)->mt_resid = 0;
490 		((struct mtget*)addr)->mt_fileno = 0;		/* file */
491 		((struct mtget*)addr)->mt_blkno = 0;		/* block */
492 		((struct mtget*)addr)->mt_density = sc->dens;	/* density */
493 		return 0;
494 	case MTIOCTOP:
495 		break;
496 	}
497 
498 	switch ((short)((struct mtop*)addr)->mt_op) {
499 	default:
500 #if 0
501 	case MTFSR:	/* forward space record */
502 	case MTBSR:	/* backward space record */
503 	case MTBSF:	/* backward space file */
504 #endif
505 		return EINVAL;
506 	case MTNOP:	/* no operation, sets status only */
507 	case MTCACHE:	/* enable controller cache */
508 	case MTNOCACHE:	/* disable controller cache */
509 		return 0;
510 	case MTREW:	/* rewind */
511 	case MTOFFL:	/* rewind and put the drive offline */
512 		if (sc->flags & TPREW)   /* rewind is running */
513 			return 0;
514 		if ((error = wtwait(sc, PCATCH, "wtorew")) != 0)
515 			return error;
516 		wtrewind(sc);
517 		return 0;
518 	case MTFSF:	/* forward space file */
519 		for (count = ((struct mtop*)addr)->mt_count; count > 0;
520 		    --count) {
521 			if ((error = wtwait(sc, PCATCH, "wtorfm")) != 0)
522 				return error;
523 			if ((error = wtreadfm(sc)) != 0)
524 				return error;
525 		}
526 		return 0;
527 	case MTWEOF:	/* write an end-of-file record */
528 		if ((sc->flags & TPWRITE) == 0 || (sc->flags & TPWP))
529 			return EACCES;
530 		if ((error = wtwait(sc, PCATCH, "wtowfm")) != 0)
531 			return error;
532 		if ((error = wtwritefm(sc)) != 0)
533 			return error;
534 		return 0;
535 	}
536 
537 #ifdef DIAGNOSTIC
538 	panic("wtioctl: impossible");
539 #endif
540 }
541 
542 /*
543  * Strategy routine.
544  */
545 void
wtstrategy(bp)546 wtstrategy(bp)
547 	struct buf *bp;
548 {
549 	int unit = minor(bp->b_dev) & T_UNIT;
550 	struct wt_softc *sc = wt_cd.cd_devs[unit];
551 	int s;
552 
553 	bp->b_resid = bp->b_bcount;
554 
555 	/* at file marks and end of tape, we just return '0 bytes available' */
556 	if (sc->flags & TPVOL)
557 		goto xit;
558 
559 	if (bp->b_flags & B_READ) {
560 		/* Check read access and no previous write to this tape. */
561 		if ((sc->flags & TPREAD) == 0 || (sc->flags & TPWANY))
562 			goto errxit;
563 
564 		/* For now, we assume that all data will be copied out */
565 		/* If read command outstanding, just skip down */
566 		if ((sc->flags & TPRO) == 0) {
567 			if (!wtsense(sc, 1, TP_WRP)) {
568 				/* Clear status. */
569 				goto errxit;
570 			}
571 			if (!wtcmd(sc, QIC_RDDATA)) {
572 				/* Set read mode. */
573 				wtsense(sc, 1, TP_WRP);
574 				goto errxit;
575 			}
576 			sc->flags |= TPRO | TPRANY;
577 		}
578 	} else {
579 		/* Check write access and write protection. */
580 		/* No previous read from this tape allowed. */
581 		if ((sc->flags & TPWRITE) == 0 || (sc->flags & (TPWP | TPRANY)))
582 			goto errxit;
583 
584 		/* If write command outstanding, just skip down */
585 		if ((sc->flags & TPWO) == 0) {
586 			if (!wtsense(sc, 1, 0)) {
587 				/* Clear status. */
588 				goto errxit;
589 			}
590 			if (!wtcmd(sc, QIC_WRTDATA)) {
591 				/* Set write mode. */
592 				wtsense(sc, 1, 0);
593 				goto errxit;
594 			}
595 			sc->flags |= TPWO | TPWANY;
596 		}
597 	}
598 
599 	if (bp->b_bcount == 0)
600 		goto xit;
601 
602 	sc->flags &= ~TPEXCEP;
603 	s = splbio();
604 	if (wtstart(sc, bp->b_flags, bp->b_data, bp->b_bcount)) {
605 		wtwait(sc, 0, (bp->b_flags & B_READ) ? "wtread" : "wtwrite");
606 		bp->b_resid -= sc->dmacount;
607 	}
608 	splx(s);
609 
610 	if (sc->flags & TPEXCEP) {
611 errxit:
612 		bp->b_flags |= B_ERROR;
613 		bp->b_error = EIO;
614 	}
615 xit:
616 	s = splbio();
617 	biodone(bp);
618 	splx(s);
619 	return;
620 }
621 
622 int
wtread(dev,uio,flags)623 wtread(dev, uio, flags)
624 	dev_t dev;
625 	struct uio *uio;
626 	int flags;
627 {
628 
629 	return (physio(wtstrategy, NULL, dev, B_READ, minphys, uio));
630 }
631 
632 int
wtwrite(dev,uio,flags)633 wtwrite(dev, uio, flags)
634 	dev_t dev;
635 	struct uio *uio;
636 	int flags;
637 {
638 
639 	return (physio(wtstrategy, NULL, dev, B_WRITE, minphys, uio));
640 }
641 
642 /*
643  * Interrupt routine.
644  */
645 int
wtintr(arg)646 wtintr(arg)
647 	void *arg;
648 {
649 	struct wt_softc *sc = arg;
650 	u_char x;
651 
652 	x = inb(sc->STATPORT);			/* get status */
653 	WTDBPRINT(("wtintr() status=0x%x -- ", x));
654 	if ((x & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP)) {
655 		WTDBPRINT(("busy\n"));
656 		return 0;			/* device is busy */
657 	}
658 
659 	/*
660 	 * Check if rewind finished.
661 	 */
662 	if (sc->flags & TPREW) {
663 		WTDBPRINT(((x & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP) ?
664 		    "rewind busy?\n" : "rewind finished\n"));
665 		sc->flags &= ~TPREW;		/* rewind finished */
666 		wtsense(sc, 1, TP_WRP);
667 		wakeup((caddr_t)sc);
668 		return 1;
669 	}
670 
671 	/*
672 	 * Check if writing/reading of file mark finished.
673 	 */
674 	if (sc->flags & (TPRMARK | TPWMARK)) {
675 		WTDBPRINT(((x & (sc->BUSY | sc->NOEXCEP)) == (sc->BUSY | sc->NOEXCEP) ?
676 		    "marker r/w busy?\n" : "marker r/w finished\n"));
677 		if ((x & sc->NOEXCEP) == 0)	/* operation failed */
678 			wtsense(sc, 1, (sc->flags & TPRMARK) ? TP_WRP : 0);
679 		sc->flags &= ~(TPRMARK | TPWMARK); /* operation finished */
680 		wakeup((caddr_t)sc);
681 		return 1;
682 	}
683 
684 	/*
685 	 * Do we started any i/o?  If no, just return.
686 	 */
687 	if ((sc->flags & TPACTIVE) == 0) {
688 		WTDBPRINT(("unexpected interrupt\n"));
689 		return 0;
690 	}
691 	sc->flags &= ~TPACTIVE;
692 	sc->dmacount += sc->bsize;		/* increment counter */
693 
694 	/*
695 	 * Clean up dma.
696 	 */
697 	if ((sc->dmaflags & DMAMODE_READ) &&
698 	    (sc->dmatotal - sc->dmacount) < sc->bsize) {
699 		/* If reading short block, copy the internal buffer
700 		 * to the user memory. */
701 		isadma_done(sc->chan);
702 		bcopy(sc->buf, sc->dmavaddr, sc->dmatotal - sc->dmacount);
703 	} else
704 		isadma_done(sc->chan);
705 
706 	/*
707 	 * On exception, check for end of file and end of volume.
708 	 */
709 	if ((x & sc->NOEXCEP) == 0) {
710 		WTDBPRINT(("i/o exception\n"));
711 		wtsense(sc, 1, (sc->dmaflags & DMAMODE_READ) ? TP_WRP : 0);
712 		if (sc->error & (TP_EOM | TP_FIL))
713 			sc->flags |= TPVOL;	/* end of file */
714 		else
715 			sc->flags |= TPEXCEP;	/* i/o error */
716 		wakeup((caddr_t)sc);
717 		return 1;
718 	}
719 
720 	if (sc->dmacount < sc->dmatotal) {
721 		/* Continue I/O. */
722 		sc->dmavaddr += sc->bsize;
723 		wtdma(sc);
724 		WTDBPRINT(("continue i/o, %d\n", sc->dmacount));
725 		return 1;
726 	}
727 	if (sc->dmacount > sc->dmatotal)	/* short last block */
728 		sc->dmacount = sc->dmatotal;
729 	/* Wake up user level. */
730 	timeout_del(&sc->sc_tmo);
731 	wakeup((caddr_t)sc);
732 	WTDBPRINT(("i/o finished, %d\n", sc->dmacount));
733 	return 1;
734 }
735 
736 /* start the rewind operation */
737 void
wtrewind(sc)738 wtrewind(sc)
739 	struct wt_softc *sc;
740 {
741 	int rwmode = sc->flags & (TPRO | TPWO);
742 
743 	sc->flags &= ~(TPRO | TPWO | TPVOL);
744 	/*
745 	 * Wangtek strictly follows QIC-02 standard:
746 	 * clearing ONLINE in read/write modes causes rewind.
747 	 * REWIND command is not allowed in read/write mode
748 	 * and gives `illegal command' error.
749 	 */
750 	if (sc->type == WANGTEK && rwmode) {
751 		outb(sc->CTLPORT, 0);
752 	} else if (!wtcmd(sc, QIC_REWIND))
753 		return;
754 	sc->flags |= TPSTART | TPREW;
755 	wtclock(sc);
756 }
757 
758 /*
759  * Start the `read marker' operation.
760  */
761 int
wtreadfm(sc)762 wtreadfm(sc)
763 	struct wt_softc *sc;
764 {
765 
766 	sc->flags &= ~(TPRO | TPWO | TPVOL);
767 	if (!wtcmd(sc, QIC_READFM)) {
768 		wtsense(sc, 1, TP_WRP);
769 		return EIO;
770 	}
771 	sc->flags |= TPRMARK | TPRANY;
772 	wtclock(sc);
773 	/* Don't wait for completion here. */
774 	return 0;
775 }
776 
777 /*
778  * Write marker to the tape.
779  */
780 int
wtwritefm(sc)781 wtwritefm(sc)
782 	struct wt_softc *sc;
783 {
784 
785 	tsleep((caddr_t)wtwritefm, WTPRI, "wtwfm", hz);
786 	sc->flags &= ~(TPRO | TPWO);
787 	if (!wtcmd(sc, QIC_WRITEFM)) {
788 		wtsense(sc, 1, 0);
789 		return EIO;
790 	}
791 	sc->flags |= TPWMARK | TPWANY;
792 	wtclock(sc);
793 	return wtwait(sc, 0, "wtwfm");
794 }
795 
796 /*
797  * While controller status & mask == bits continue waiting.
798  */
799 u_char
wtpoll(sc,mask,bits)800 wtpoll(sc, mask, bits)
801 	struct wt_softc *sc;
802 	int mask, bits;
803 {
804 	u_char x;
805 	int i;
806 
807 	/* Poll status port, waiting for specified bits. */
808 	for (i = 0; i < 1000; ++i) {	/* up to 1 msec */
809 		x = inb(sc->STATPORT);
810 		if ((x & mask) != bits)
811 			return x;
812 		delay(1);
813 	}
814 	for (i = 0; i < 100; ++i) {	/* up to 10 msec */
815 		x = inb(sc->STATPORT);
816 		if ((x & mask) != bits)
817 			return x;
818 		delay(100);
819 	}
820 	for (;;) {			/* forever */
821 		x = inb(sc->STATPORT);
822 		if ((x & mask) != bits)
823 			return x;
824 		tsleep((caddr_t)wtpoll, WTPRI, "wtpoll", 1);
825 	}
826 }
827 
828 /*
829  * Execute QIC command.
830  */
831 int
wtcmd(sc,cmd)832 wtcmd(sc, cmd)
833 	struct wt_softc *sc;
834 	int cmd;
835 {
836 	u_char x;
837 	int s;
838 
839 	WTDBPRINT(("wtcmd() cmd=0x%x\n", cmd));
840 	s = splbio();
841 	x = wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
842 	if ((x & sc->NOEXCEP) == 0) {			/* error */
843 		splx(s);
844 		return 0;
845 	}
846 
847 	outb(sc->CMDPORT, cmd);				/* output the command */
848 
849 	outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE);	/* set request */
850 	wtpoll(sc, sc->BUSY, sc->BUSY);			/* wait for ready */
851 	outb(sc->CTLPORT, sc->IEN | sc->ONLINE);	/* reset request */
852 	wtpoll(sc, sc->BUSY, 0);			/* wait for not ready */
853 	splx(s);
854 	return 1;
855 }
856 
857 /* wait for the end of i/o, seeking marker or rewind operation */
858 int
wtwait(sc,catch,msg)859 wtwait(sc, catch, msg)
860 	struct wt_softc *sc;
861 	int catch;
862 	char *msg;
863 {
864 	int error;
865 
866 	WTDBPRINT(("wtwait() `%s'\n", msg));
867 	while (sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
868 		if ((error = tsleep((caddr_t)sc, WTPRI | catch, msg, 0)) != 0)
869 			return error;
870 	return 0;
871 }
872 
873 /* initialize dma for the i/o operation */
874 void
wtdma(sc)875 wtdma(sc)
876 	struct wt_softc *sc;
877 {
878 
879 	sc->flags |= TPACTIVE;
880 	wtclock(sc);
881 
882 	if (sc->type == ARCHIVE) {
883 		/* Set DMA. */
884 		outb(sc->SDMAPORT, 0);
885 	}
886 
887 	if ((sc->dmaflags & DMAMODE_READ) &&
888 	    (sc->dmatotal - sc->dmacount) < sc->bsize) {
889 		/* Reading short block; do it through the internal buffer. */
890 		isadma_start(sc->buf, sc->bsize, sc->chan, sc->dmaflags);
891 	} else
892 		isadma_start(sc->dmavaddr, sc->bsize, sc->chan, sc->dmaflags);
893 }
894 
895 /* start i/o operation */
896 int
wtstart(sc,flag,vaddr,len)897 wtstart(sc, flag, vaddr, len)
898 	struct wt_softc *sc;
899 	int flag;
900 	void *vaddr;
901 	size_t len;
902 {
903 	u_char x;
904 
905 	WTDBPRINT(("wtstart()\n"));
906 	x = wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
907 	if ((x & sc->NOEXCEP) == 0) {
908 		sc->flags |= TPEXCEP;	/* error */
909 		return 0;
910 	}
911 	sc->flags &= ~TPEXCEP;		/* clear exception flag */
912 	sc->dmavaddr = vaddr;
913 	sc->dmatotal = len;
914 	sc->dmacount = 0;
915 	sc->dmaflags = flag & B_READ ? DMAMODE_READ : DMAMODE_WRITE;
916 	wtdma(sc);
917 	return 1;
918 }
919 
920 /*
921  * Start timer.
922  */
923 void
wtclock(sc)924 wtclock(sc)
925 	struct wt_softc *sc;
926 {
927 
928 	if (sc->flags & TPTIMER)
929 		return;
930 	sc->flags |= TPTIMER;
931 	/*
932 	 * Some controllers seem to lose dma interrupts too often.  To make the
933 	 * tape stream we need 1 tick timeout.
934 	 */
935 	timeout_add(&sc->sc_tmo, (sc->flags & TPACTIVE) ? 1 : hz);
936 }
937 
938 /*
939  * Simulate an interrupt periodically while i/o is going.
940  * This is necessary in case interrupts get eaten due to
941  * multiple devices on a single IRQ line.
942  */
943 void
wttimer(arg)944 wttimer(arg)
945 	void *arg;
946 {
947 	struct wt_softc *sc = (struct wt_softc *)arg;
948 	int s;
949 
950 	sc->flags &= ~TPTIMER;
951 	if ((sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK)) == 0)
952 		return;
953 
954 	/* If i/o going, simulate interrupt. */
955 	s = splbio();
956 	if ((inb(sc->STATPORT) & (sc->BUSY | sc->NOEXCEP)) != (sc->BUSY | sc->NOEXCEP)) {
957 		WTDBPRINT(("wttimer() -- "));
958 		wtintr(sc);
959 	}
960 	splx(s);
961 
962 	/* Restart timer if i/o pending. */
963 	if (sc->flags & (TPACTIVE | TPREW | TPRMARK | TPWMARK))
964 		wtclock(sc);
965 }
966 
967 /*
968  * Perform QIC-02 and QIC-36 compatible reset sequence.
969  */
970 int
wtreset(sc)971 wtreset(sc)
972 	struct wt_softc *sc;
973 {
974 	u_char x;
975 	int i;
976 
977 	outb(sc->CTLPORT, sc->RESET | sc->ONLINE); /* send reset */
978 	delay(30);
979 	outb(sc->CTLPORT, sc->ONLINE);	/* turn off reset */
980 	delay(30);
981 
982 	/* Read the controller status. */
983 	x = inb(sc->STATPORT);
984 	if (x == 0xff)			/* no port at this address? */
985 		return 0;
986 
987 	/* Wait 3 sec for reset to complete. Needed for QIC-36 boards? */
988 	for (i = 0; i < 3000; ++i) {
989 		if ((x & sc->BUSY) == 0 || (x & sc->NOEXCEP) == 0)
990 			break;
991 		delay(1000);
992 		x = inb(sc->STATPORT);
993 	}
994 	return (x & sc->RESETMASK) == sc->RESETVAL;
995 }
996 
997 /*
998  * Get controller status information.  Return 0 if user i/o request should
999  * receive an i/o error code.
1000  */
1001 int
wtsense(sc,verbose,ignore)1002 wtsense(sc, verbose, ignore)
1003 	struct wt_softc *sc;
1004 	int verbose, ignore;
1005 {
1006 	char *msg = 0;
1007 	int error;
1008 
1009 	WTDBPRINT(("wtsense() ignore=0x%x\n", ignore));
1010 	sc->flags &= ~(TPRO | TPWO);
1011 	if (!wtstatus(sc))
1012 		return 0;
1013 	if ((sc->error & TP_ST0) == 0)
1014 		sc->error &= ~TP_ST0MASK;
1015 	if ((sc->error & TP_ST1) == 0)
1016 		sc->error &= ~TP_ST1MASK;
1017 	sc->error &= ~ignore;	/* ignore certain errors */
1018 	error = sc->error & (TP_FIL | TP_BNL | TP_UDA | TP_EOM | TP_WRP |
1019 	    TP_USL | TP_CNI | TP_MBD | TP_NDT | TP_ILL);
1020 	if (!error)
1021 		return 1;
1022 	if (!verbose)
1023 		return 0;
1024 
1025 	/* lifted from tdriver.c from Wangtek */
1026 	if (error & TP_USL)
1027 		msg = "Drive not online";
1028 	else if (error & TP_CNI)
1029 		msg = "No cartridge";
1030 	else if ((error & TP_WRP) && (sc->flags & TPWP) == 0) {
1031 		msg = "Tape is write protected";
1032 		sc->flags |= TPWP;
1033 	} else if (error & TP_FIL)
1034 		msg = 0 /*"Filemark detected"*/;
1035 	else if (error & TP_EOM)
1036 		msg = 0 /*"End of tape"*/;
1037 	else if (error & TP_BNL)
1038 		msg = "Block not located";
1039 	else if (error & TP_UDA)
1040 		msg = "Unrecoverable data error";
1041 	else if (error & TP_NDT)
1042 		msg = "No data detected";
1043 	else if (error & TP_ILL)
1044 		msg = "Illegal command";
1045 	if (msg)
1046 		printf("%s: %s\n", sc->sc_dev.dv_xname, msg);
1047 	return 0;
1048 }
1049 
1050 /*
1051  * Get controller status information.
1052  */
1053 int
wtstatus(sc)1054 wtstatus(sc)
1055 	struct wt_softc *sc;
1056 {
1057 	char *p;
1058 	int s;
1059 
1060 	s = splbio();
1061 	wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP); /* ready? */
1062 	outb(sc->CMDPORT, QIC_RDSTAT);	/* send `read status' command */
1063 
1064 	outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE);	/* set request */
1065 	wtpoll(sc, sc->BUSY, sc->BUSY);			/* wait for ready */
1066 	outb(sc->CTLPORT, sc->ONLINE);			/* reset request */
1067 	wtpoll(sc, sc->BUSY, 0);			/* wait for not ready */
1068 
1069 	p = (char *)&sc->error;
1070 	while (p < (char *)&sc->error + 6) {
1071 		u_char x = wtpoll(sc, sc->BUSY | sc->NOEXCEP, sc->BUSY | sc->NOEXCEP);
1072 		if ((x & sc->NOEXCEP) == 0) {	/* error */
1073 			splx(s);
1074 			return 0;
1075 		}
1076 
1077 		*p++ = inb(sc->DATAPORT);	/* read status byte */
1078 
1079 		outb(sc->CTLPORT, sc->REQUEST | sc->ONLINE); /* set request */
1080 		wtpoll(sc, sc->BUSY, 0);	/* wait for not ready */
1081 		outb(sc->CTLPORT, sc->ONLINE);	/* unset request */
1082 	}
1083 	splx(s);
1084 	return 1;
1085 }
1086