xref: /netbsd-src/sys/arch/hp300/dev/ct.c (revision 8ac07aec990b9d2e483062509d0a9fa5b4f57cf2)
1 /*	$NetBSD: ct.c,v 1.53 2008/03/29 06:47:07 tsutsui Exp $	*/
2 
3 /*-
4  * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jason R. Thorpe.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the NetBSD
21  *	Foundation, Inc. and its contributors.
22  * 4. Neither the name of The NetBSD Foundation nor the names of its
23  *    contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36  * POSSIBILITY OF SUCH DAMAGE.
37  */
38 
39 /*
40  * Copyright (c) 1982, 1990, 1993
41  *	The Regents of the University of California.  All rights reserved.
42  *
43  * Redistribution and use in source and binary forms, with or without
44  * modification, are permitted provided that the following conditions
45  * are met:
46  * 1. Redistributions of source code must retain the above copyright
47  *    notice, this list of conditions and the following disclaimer.
48  * 2. Redistributions in binary form must reproduce the above copyright
49  *    notice, this list of conditions and the following disclaimer in the
50  *    documentation and/or other materials provided with the distribution.
51  * 3. Neither the name of the University nor the names of its contributors
52  *    may be used to endorse or promote products derived from this software
53  *    without specific prior written permission.
54  *
55  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65  * SUCH DAMAGE.
66  *
67  *	@(#)ct.c	8.2 (Berkeley) 1/12/94
68  */
69 
70 /*
71  * CS80 cartridge tape driver (9144, 88140, 9145)
72  *
73  * Reminder:
74  *	C_CC bit (character count option) when used in the CS/80 command
75  *	'set options' will cause the tape not to stream.
76  *
77  * TODO:
78  *	make filesystem compatible
79  *	make block mode work according to mtio(4) spec. (if possible)
80  *	merge with cs80 disk driver
81  *	finish support of 9145
82  */
83 
84 #include <sys/cdefs.h>
85 __KERNEL_RCSID(0, "$NetBSD: ct.c,v 1.53 2008/03/29 06:47:07 tsutsui Exp $");
86 
87 #include <sys/param.h>
88 #include <sys/systm.h>
89 #include <sys/buf.h>
90 #include <sys/bufq.h>
91 #include <sys/conf.h>
92 #include <sys/device.h>
93 #include <sys/ioctl.h>
94 #include <sys/mtio.h>
95 #include <sys/proc.h>
96 #include <sys/tprintf.h>
97 
98 #include <hp300/dev/hpibvar.h>
99 
100 #include <hp300/dev/ctreg.h>
101 
102 #include "ioconf.h"
103 
104 /* number of eof marks to remember */
105 #define EOFS	128
106 
107 struct	ct_softc {
108 	device_t sc_dev;
109 	int	sc_slave;		/* HP-IB slave ID */
110 	int	sc_punit;		/* physical unit */
111 	struct	ct_iocmd sc_ioc;
112 	struct	ct_rscmd sc_rsc;
113 	struct	ct_stat sc_stat;
114 	struct	ct_ssmcmd sc_ssmc;
115 	struct	ct_srcmd sc_src;
116 	struct	ct_soptcmd sc_soptc;
117 	struct	ct_ulcmd sc_ul;
118 	struct	ct_wfmcmd sc_wfm;
119 	struct	ct_clearcmd sc_clear;
120 	struct	bufq_state *sc_tab;
121 	int	sc_active;
122 	struct	buf *sc_bp;
123 	struct	buf sc_bufstore;	/* XXX */
124 	int	sc_blkno;
125 	int	sc_cmd;
126 	int	sc_resid;
127 	char	*sc_addr;
128 	int	sc_flags;
129 	short	sc_type;
130 	tpr_t	sc_tpr;
131 	struct	hpibqueue sc_hq;	/* entry on hpib job queue */
132 	int	sc_eofp;
133 	int	sc_eofs[EOFS];
134 };
135 
136 /* flags */
137 #define	CTF_OPEN	0x01
138 #define	CTF_ALIVE	0x02
139 #define	CTF_WRT		0x04
140 #define	CTF_CMD		0x08
141 #define	CTF_IO		0x10
142 #define	CTF_BEOF	0x20
143 #define	CTF_AEOF	0x40
144 #define	CTF_EOT		0x80
145 #define	CTF_STATWAIT	0x100
146 #define CTF_CANSTREAM	0x200
147 #define	CTF_WRTTN	0x400
148 
149 static int	ctmatch(device_t, cfdata_t, void *);
150 static void	ctattach(device_t, device_t, void *);
151 
152 CFATTACH_DECL_NEW(ct, sizeof(struct ct_softc),
153     ctmatch, ctattach, NULL, NULL);
154 
155 static dev_type_open(ctopen);
156 static dev_type_close(ctclose);
157 static dev_type_read(ctread);
158 static dev_type_write(ctwrite);
159 static dev_type_ioctl(ctioctl);
160 static dev_type_strategy(ctstrategy);
161 
162 const struct bdevsw ct_bdevsw = {
163 	ctopen, ctclose, ctstrategy, ctioctl, nodump, nosize, D_TAPE
164 };
165 
166 const struct cdevsw ct_cdevsw = {
167 	ctopen, ctclose, ctread, ctwrite, ctioctl,
168 	nostop, notty, nopoll, nommap, nokqfilter, D_TAPE
169 };
170 
171 static int	ctident(device_t, struct ct_softc *,
172 		    struct hpibbus_attach_args *);
173 
174 static void	ctreset(struct ct_softc *);
175 static void	ctaddeof(struct ct_softc *);
176 static void	ctustart(struct ct_softc *);
177 static void	cteof(struct ct_softc *, struct buf *);
178 static void	ctdone(struct ct_softc *, struct buf *);
179 
180 static void	ctstart(void *);
181 static void	ctgo(void *);
182 static void	ctintr(void *);
183 
184 static void	ctcommand(dev_t, int, int);
185 
186 static const struct ctinfo {
187 	short	hwid;
188 	short	punit;
189 	const char *desc;
190 } ctinfo[] = {
191 	{ CT7946ID,	1,	"7946A"	},
192 	{ CT7912PID,	1,	"7912P"	},
193 	{ CT7914PID,	1,	"7914P"	},
194 	{ CT9144ID,	0,	"9144"	},
195 	{ CT9145ID,	0,	"9145"	},
196 	{ CT35401ID,	0,	"35401A"},
197 };
198 static const int nctinfo = __arraycount(ctinfo);
199 
200 #define	CT_NOREW	4
201 #define	CT_STREAM	8
202 #define	UNIT(x)		(minor(x) & 3)
203 #define	ctpunit(x)	((x) & 7)
204 
205 #ifdef DEBUG
206 int ctdebug = 0;
207 #define CDB_FILES	0x01
208 #define CT_BSF		0x02
209 #endif
210 
211 static int
212 ctmatch(device_t parent, cfdata_t cf, void *aux)
213 {
214 	struct hpibbus_attach_args *ha = aux;
215 
216 	return ctident(parent, NULL, ha);
217 }
218 
219 static void
220 ctattach(device_t parent, device_t self, void *aux)
221 {
222 	struct ct_softc *sc = device_private(self);
223 	struct hpibbus_attach_args *ha = aux;
224 
225 	sc->sc_dev = self;
226 	if (ctident(parent, sc, ha) == 0) {
227 		aprint_error(": didn't respond to describe command!\n");
228 		return;
229 	}
230 
231 	sc->sc_slave = ha->ha_slave;
232 	sc->sc_punit = ha->ha_punit;
233 
234 	bufq_alloc(&sc->sc_tab, "fcfs", 0);
235 
236 	/* Initialize hpib job queue entry. */
237 	sc->sc_hq.hq_softc = sc;
238 	sc->sc_hq.hq_slave = sc->sc_slave;
239 	sc->sc_hq.hq_start = ctstart;
240 	sc->sc_hq.hq_go = ctgo;
241 	sc->sc_hq.hq_intr = ctintr;
242 
243 	ctreset(sc);
244 	sc->sc_flags |= CTF_ALIVE;
245 }
246 
247 static int
248 ctident(device_t parent, struct ct_softc *sc, struct hpibbus_attach_args *ha)
249 {
250 	struct ct_describe desc;
251 	u_char stat, cmd[3];
252 	char name[7];
253 	int i, id, n, type, canstream;
254 
255 	type = canstream = 0;
256 
257 	/* Verify that we have a CS80 device. */
258 	if ((ha->ha_id & 0x200) == 0)
259 		return 0;
260 
261 	/* Is it one of the tapes we support? */
262 	for (id = 0; id < nctinfo; id++)
263 		if (ha->ha_id == ctinfo[id].hwid)
264 			break;
265 	if (id == nctinfo)
266 		return 0;
267 
268 	ha->ha_punit = ctinfo[id].punit;
269 
270 	/*
271 	 * So far, so good.  Get drive parameters.  Note command
272 	 * is always issued to unit 0.
273 	 */
274 	cmd[0] = C_SUNIT(0);
275 	cmd[1] = C_SVOL(0);
276 	cmd[2] = C_DESC;
277 	hpibsend(device_unit(parent), ha->ha_slave, C_CMD, cmd, sizeof(cmd));
278 	hpibrecv(device_unit(parent), ha->ha_slave, C_EXEC, &desc, 37);
279 	hpibrecv(device_unit(parent), ha->ha_slave, C_QSTAT, &stat,
280 		 sizeof(stat));
281 
282 	memset(name, 0, sizeof(name));
283 	if (stat == 0) {
284 		n = desc.d_name;
285 		for (i = 5; i >= 0; i--) {
286 			name[i] = (n & 0xf) + '0';
287 			n >>= 4;
288 		}
289 	}
290 
291 	switch (ha->ha_id) {
292 	case CT7946ID:
293 		if (memcmp(name, "079450", 6) == 0)
294 			return 0;		/* not really a 7946 */
295 		/* fall into... */
296 	case CT9144ID:
297 	case CT9145ID:
298 	case CT35401ID:
299 		type = CT9144;
300 		canstream = 1;
301 		break;
302 
303 	case CT7912PID:
304 	case CT7914PID:
305 		type = CT88140;
306 		break;
307 	}
308 
309 	if (sc != NULL) {
310 		sc->sc_type = type;
311 		sc->sc_flags = canstream ? CTF_CANSTREAM : 0;
312 		aprint_normal(": %s %stape\n", ctinfo[id].desc,
313 		    canstream ? "streaming " : "");
314 	}
315 
316 	return 1;
317 }
318 
319 static void
320 ctreset(struct ct_softc *sc)
321 {
322 	int ctlr, slave;
323 	uint8_t stat;
324 
325 	ctlr = device_unit(device_parent(sc->sc_dev));
326 	slave = sc->sc_slave;
327 
328 	sc->sc_clear.unit = C_SUNIT(sc->sc_punit);
329 	sc->sc_clear.cmd = C_CLEAR;
330 	hpibsend(ctlr, slave, C_TCMD, &sc->sc_clear, sizeof(sc->sc_clear));
331 	hpibswait(ctlr, slave);
332 	hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
333 
334 	sc->sc_src.unit = C_SUNIT(CTCTLR);
335 	sc->sc_src.nop = C_NOP;
336 	sc->sc_src.cmd = C_SREL;
337 	sc->sc_src.param = C_REL;
338 	hpibsend(ctlr, slave, C_CMD, &sc->sc_src, sizeof(sc->sc_src));
339 	hpibswait(ctlr, slave);
340 	hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
341 
342 	sc->sc_ssmc.unit = C_SUNIT(sc->sc_punit);
343 	sc->sc_ssmc.cmd = C_SSM;
344 	sc->sc_ssmc.refm = REF_MASK;
345 	sc->sc_ssmc.fefm = FEF_MASK;
346 	sc->sc_ssmc.aefm = AEF_MASK;
347 	sc->sc_ssmc.iefm = IEF_MASK;
348 	hpibsend(ctlr, slave, C_CMD, &sc->sc_ssmc, sizeof(sc->sc_ssmc));
349 	hpibswait(ctlr, slave);
350 	hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
351 
352 	sc->sc_soptc.unit = C_SUNIT(sc->sc_punit);
353 	sc->sc_soptc.nop = C_NOP;
354 	sc->sc_soptc.cmd = C_SOPT;
355 	sc->sc_soptc.opt = C_SPAR;
356 	hpibsend(ctlr, slave, C_CMD, &sc->sc_soptc, sizeof(sc->sc_soptc));
357 	hpibswait(ctlr, slave);
358 	hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
359 }
360 
361 /*ARGSUSED*/
362 static int
363 ctopen(dev_t dev, int flag, int type, struct lwp *l)
364 {
365 	struct ct_softc *sc;
366 	uint8_t stat;
367 	int cc, ctlr, slave;
368 
369 	if (UNIT(dev) >= ct_cd.cd_ndevs ||
370 	    (sc = device_private(ct_cd.cd_devs[UNIT(dev)])) == NULL ||
371 	    (sc->sc_flags & CTF_ALIVE) == 0)
372 		return ENXIO;
373 
374 	if (sc->sc_flags & CTF_OPEN)
375 		return EBUSY;
376 
377 	ctlr = device_unit(device_parent(sc->sc_dev));
378 	slave = sc->sc_slave;
379 
380 	sc->sc_soptc.unit = C_SUNIT(sc->sc_punit);
381 	sc->sc_soptc.nop = C_NOP;
382 	sc->sc_soptc.cmd = C_SOPT;
383 	if ((dev & CT_STREAM) && (sc->sc_flags & CTF_CANSTREAM))
384 		sc->sc_soptc.opt = C_SPAR | C_IMRPT;
385 	else
386 		sc->sc_soptc.opt = C_SPAR;
387 
388 	/*
389 	 * Check the return of hpibsend() and hpibswait().
390 	 * Drive could be loading/unloading a tape. If not checked,
391 	 * driver hangs.
392 	 */
393 	cc = hpibsend(ctlr, slave, C_CMD, &sc->sc_soptc, sizeof(sc->sc_soptc));
394 	if (cc != sizeof(sc->sc_soptc))
395 		return EBUSY;
396 
397 	hpibswait(ctlr, slave);
398 	cc = hpibrecv(ctlr, slave, C_QSTAT, &stat, sizeof(stat));
399 	if (cc != sizeof(stat))
400 		return EBUSY;
401 
402 	sc->sc_tpr = tprintf_open(l->l_proc);
403 	sc->sc_flags |= CTF_OPEN;
404 	return 0;
405 }
406 
407 /*ARGSUSED*/
408 static int
409 ctclose(dev_t dev, int flag, int fmt, struct lwp *l)
410 {
411 	struct ct_softc *sc = device_private(ct_cd.cd_devs[UNIT(dev)]);
412 
413 	if ((sc->sc_flags & (CTF_WRT|CTF_WRTTN)) == (CTF_WRT|CTF_WRTTN) &&
414 	    (sc->sc_flags & CTF_EOT) == 0 ) { /* XXX return error if EOT ?? */
415 		ctcommand(dev, MTWEOF, 2);
416 		ctcommand(dev, MTBSR, 1);
417 		if (sc->sc_eofp == EOFS - 1)
418 			sc->sc_eofs[EOFS - 1]--;
419 		else
420 			sc->sc_eofp--;
421 #ifdef DEBUG
422 		if(ctdebug & CT_BSF)
423 			printf("%s: ctclose backup eofs prt %d blk %d\n",
424 			    device_xname(sc->sc_dev), sc->sc_eofp,
425 			    sc->sc_eofs[sc->sc_eofp]);
426 #endif
427 	}
428 	if ((minor(dev) & CT_NOREW) == 0)
429 		ctcommand(dev, MTREW, 1);
430 	sc->sc_flags &= ~(CTF_OPEN | CTF_WRT | CTF_WRTTN);
431 	tprintf_close(sc->sc_tpr);
432 #ifdef DEBUG
433 	if (ctdebug & CDB_FILES)
434 		printf("ctclose: flags %x\n", sc->sc_flags);
435 #endif
436 	return 0;	/* XXX */
437 }
438 
439 static void
440 ctcommand(dev_t dev, int cmd, int cnt)
441 {
442 	struct ct_softc *sc = device_private(ct_cd.cd_devs[UNIT(dev)]);
443 	struct buf *bp = &sc->sc_bufstore;
444 	struct buf *nbp = 0;
445 
446 	if (cmd == MTBSF && sc->sc_eofp == EOFS - 1) {
447 		cnt = sc->sc_eofs[EOFS - 1] - cnt;
448 		ctcommand(dev, MTREW, 1);
449 		ctcommand(dev, MTFSF, cnt);
450 		cnt = 2;
451 		cmd = MTBSR;
452 	}
453 
454 	if (cmd == MTBSF && sc->sc_eofp - cnt < 0) {
455 		cnt = 1;
456 		cmd = MTREW;
457 	}
458 
459 	sc->sc_flags |= CTF_CMD;
460 	sc->sc_bp = bp;
461 	sc->sc_cmd = cmd;
462 	bp->b_dev = dev;
463 	if (cmd == MTFSF) {
464 		nbp = (struct buf *)geteblk(MAXBSIZE);
465 		bp->b_data = nbp->b_data;
466 		bp->b_bcount = MAXBSIZE;
467 	}
468 
469 	while (cnt-- > 0) {
470 		bp->b_cflags = BC_BUSY;
471 		if (cmd == MTBSF) {
472 			sc->sc_blkno = sc->sc_eofs[sc->sc_eofp];
473 			sc->sc_eofp--;
474 #ifdef DEBUG
475 			if (ctdebug & CT_BSF)
476 				printf("%s: backup eof pos %d blk %d\n",
477 				    device_xname(sc->sc_dev), sc->sc_eofp,
478 				    sc->sc_eofs[sc->sc_eofp]);
479 #endif
480 		}
481 		ctstrategy(bp);
482 		biowait(bp);
483 	}
484 	bp->b_flags = 0;
485 	sc->sc_flags &= ~CTF_CMD;
486 	if (nbp)
487 		brelse(nbp, 0);
488 }
489 
490 static void
491 ctstrategy(struct buf *bp)
492 {
493 	int s, unit;
494 	struct ct_softc *sc;
495 
496 	unit = UNIT(bp->b_dev);
497 	sc = device_private(ct_cd.cd_devs[unit]);
498 
499 	s = splbio();
500 	BUFQ_PUT(sc->sc_tab, bp);
501 	if (sc->sc_active == 0) {
502 		sc->sc_active = 1;
503 		ctustart(sc);
504 	}
505 	splx(s);
506 }
507 
508 static void
509 ctustart(struct ct_softc *sc)
510 {
511 	struct buf *bp;
512 
513 	bp = BUFQ_PEEK(sc->sc_tab);
514 	sc->sc_addr = bp->b_data;
515 	sc->sc_resid = bp->b_bcount;
516 	if (hpibreq(device_parent(sc->sc_dev), &sc->sc_hq))
517 		ctstart(sc);
518 }
519 
520 static void
521 ctstart(void *arg)
522 {
523 	struct ct_softc *sc = arg;
524 	struct buf *bp;
525 	int i, ctlr, slave;
526 
527 	ctlr = device_unit(device_parent(sc->sc_dev));
528 	slave = sc->sc_slave;
529 
530 	bp = BUFQ_PEEK(sc->sc_tab);
531 	if ((sc->sc_flags & CTF_CMD) && sc->sc_bp == bp) {
532 		switch(sc->sc_cmd) {
533 		case MTFSF:
534 			bp->b_flags |= B_READ;
535 			goto mustio;
536 
537 		case MTBSF:
538 			goto gotaddr;
539 
540 		case MTOFFL:
541 			sc->sc_blkno = 0;
542 			sc->sc_ul.unit = C_SUNIT(sc->sc_punit);
543 			sc->sc_ul.cmd = C_UNLOAD;
544 			hpibsend(ctlr, slave, C_CMD, &sc->sc_ul,
545 			    sizeof(sc->sc_ul));
546 			break;
547 
548 		case MTWEOF:
549 			sc->sc_blkno++;
550 			sc->sc_flags |= CTF_WRT;
551 			sc->sc_wfm.unit = C_SUNIT(sc->sc_punit);
552 			sc->sc_wfm.cmd = C_WFM;
553 			hpibsend(ctlr, slave, C_CMD, &sc->sc_wfm,
554 			    sizeof(sc->sc_wfm));
555 			ctaddeof(sc);
556 			break;
557 
558 		case MTBSR:
559 			sc->sc_blkno--;
560 			goto gotaddr;
561 
562 		case MTFSR:
563 			sc->sc_blkno++;
564 			goto gotaddr;
565 
566 		case MTREW:
567 			sc->sc_blkno = 0;
568 #ifdef DEBUG
569 			if(ctdebug & CT_BSF)
570 				printf("%s: clearing eofs\n",
571 				    device_xname(sc->sc_dev));
572 #endif
573 			for (i=0; i<EOFS; i++)
574 				sc->sc_eofs[i] = 0;
575 			sc->sc_eofp = 0;
576 
577 gotaddr:
578 			sc->sc_ioc.saddr = C_SADDR;
579 			sc->sc_ioc.addr0 = 0;
580 			sc->sc_ioc.addr = sc->sc_blkno;
581 			sc->sc_ioc.unit = C_SUNIT(sc->sc_punit);
582 			sc->sc_ioc.nop2 = C_NOP;
583 			sc->sc_ioc.slen = C_SLEN;
584 			sc->sc_ioc.len = 0;
585 			sc->sc_ioc.nop3 = C_NOP;
586 			sc->sc_ioc.cmd = C_READ;
587 			hpibsend(ctlr, slave, C_CMD, &sc->sc_ioc,
588 			    sizeof(sc->sc_ioc));
589 			break;
590 		}
591 	} else {
592 mustio:
593 		if ((bp->b_flags & B_READ) &&
594 		    sc->sc_flags & (CTF_BEOF|CTF_EOT)) {
595 #ifdef DEBUG
596 			if (ctdebug & CDB_FILES)
597 				printf("ctstart: before flags %x\n",
598 				    sc->sc_flags);
599 #endif
600 			if (sc->sc_flags & CTF_BEOF) {
601 				sc->sc_flags &= ~CTF_BEOF;
602 				sc->sc_flags |= CTF_AEOF;
603 #ifdef DEBUG
604 				if (ctdebug & CDB_FILES)
605 					printf("ctstart: after flags %x\n",
606 					    sc->sc_flags);
607 #endif
608 			}
609 			bp->b_resid = bp->b_bcount;
610 			ctdone(sc, bp);
611 			return;
612 		}
613 		sc->sc_flags |= CTF_IO;
614 		sc->sc_ioc.unit = C_SUNIT(sc->sc_punit);
615 		sc->sc_ioc.saddr = C_SADDR;
616 		sc->sc_ioc.addr0 = 0;
617 		sc->sc_ioc.addr = sc->sc_blkno;
618 		sc->sc_ioc.nop2 = C_NOP;
619 		sc->sc_ioc.slen = C_SLEN;
620 		sc->sc_ioc.len = sc->sc_resid;
621 		sc->sc_ioc.nop3 = C_NOP;
622 		if (bp->b_flags & B_READ)
623 			sc->sc_ioc.cmd = C_READ;
624 		else {
625 			sc->sc_ioc.cmd = C_WRITE;
626 			sc->sc_flags |= (CTF_WRT | CTF_WRTTN);
627 		}
628 		hpibsend(ctlr, slave, C_CMD, &sc->sc_ioc, sizeof(sc->sc_ioc));
629 	}
630 	hpibawait(ctlr);
631 }
632 
633 static void
634 ctgo(void *arg)
635 {
636 	struct ct_softc *sc = arg;
637 	struct buf *bp;
638 	int rw;
639 
640 	bp = BUFQ_PEEK(sc->sc_tab);
641 	rw = bp->b_flags & B_READ;
642 	hpibgo(device_unit(device_parent(sc->sc_dev)), sc->sc_slave, C_EXEC,
643 	    sc->sc_addr, sc->sc_resid, rw, rw != 0);
644 }
645 
646 /*
647  * Hideous grue to handle EOF/EOT (mostly for reads)
648  */
649 static void
650 cteof(struct ct_softc *sc, struct buf *bp)
651 {
652 	long blks;
653 
654 	/*
655 	 * EOT on a write is an error.
656 	 */
657 	if ((bp->b_flags & B_READ) == 0) {
658 		bp->b_resid = bp->b_bcount;
659 		bp->b_error = ENOSPC;
660 		sc->sc_flags |= CTF_EOT;
661 		return;
662 	}
663 	/*
664 	 * Use returned block position to determine how many blocks
665 	 * we really read and update b_resid.
666 	 */
667 	blks = sc->sc_stat.c_blk - sc->sc_blkno - 1;
668 #ifdef DEBUG
669 	if (ctdebug & CDB_FILES)
670 		printf("cteof: bc %d oblk %d nblk %ld read %ld, resid %ld\n",
671 		       bp->b_bcount, sc->sc_blkno, sc->sc_stat.c_blk,
672 		       blks, bp->b_bcount - CTKTOB(blks));
673 #endif
674 	if (blks == -1) { /* 9145 on EOF does not change sc_stat.c_blk */
675 		blks = 0;
676 		sc->sc_blkno++;
677 	}
678 	else {
679 		sc->sc_blkno = sc->sc_stat.c_blk;
680 	}
681 	bp->b_resid = bp->b_bcount - CTKTOB(blks);
682 	/*
683 	 * If we are at physical EOV or were after an EOF,
684 	 * we are now at logical EOT.
685 	 */
686 	if ((sc->sc_stat.c_aef & AEF_EOV) ||
687 	    (sc->sc_flags & CTF_AEOF)) {
688 		sc->sc_flags |= CTF_EOT;
689 		sc->sc_flags &= ~(CTF_AEOF|CTF_BEOF);
690 	}
691 	/*
692 	 * If we were before an EOF or we have just completed a FSF,
693 	 * we are now after EOF.
694 	 */
695 	else if ((sc->sc_flags & CTF_BEOF) ||
696 		 ((sc->sc_flags & CTF_CMD) && sc->sc_cmd == MTFSF)) {
697 		sc->sc_flags |= CTF_AEOF;
698 		sc->sc_flags &= ~CTF_BEOF;
699 	}
700 	/*
701 	 * Otherwise if we read something we are now before EOF
702 	 * (and no longer after EOF).
703 	 */
704 	else if (blks) {
705 		sc->sc_flags |= CTF_BEOF;
706 		sc->sc_flags &= ~CTF_AEOF;
707 	}
708 	/*
709 	 * Finally, if we didn't read anything we just passed an EOF
710 	 */
711 	else
712 		sc->sc_flags |= CTF_AEOF;
713 #ifdef DEBUG
714 	if (ctdebug & CDB_FILES)
715 		printf("cteof: leaving flags %x\n", sc->sc_flags);
716 #endif
717 }
718 
719 /* ARGSUSED */
720 static void
721 ctintr(void *arg)
722 {
723 	struct ct_softc *sc = arg;
724 	struct buf *bp;
725 	uint8_t stat;
726 	int ctlr, slave, unit;
727 
728 	ctlr = device_unit(device_parent(sc->sc_dev));
729 	slave = sc->sc_slave;
730 	unit = device_unit(sc->sc_dev);
731 
732 	bp = BUFQ_PEEK(sc->sc_tab);
733 	if (bp == NULL) {
734 		printf("%s: bp == NULL\n", device_xname(sc->sc_dev));
735 		return;
736 	}
737 	if (sc->sc_flags & CTF_IO) {
738 		sc->sc_flags &= ~CTF_IO;
739 		if (hpibustart(ctlr))
740 			ctgo(sc);
741 		return;
742 	}
743 	if ((sc->sc_flags & CTF_STATWAIT) == 0) {
744 		if (hpibpptest(ctlr, slave) == 0) {
745 			sc->sc_flags |= CTF_STATWAIT;
746 			hpibawait(ctlr);
747 			return;
748 		}
749 	} else
750 		sc->sc_flags &= ~CTF_STATWAIT;
751 	hpibrecv(ctlr, slave, C_QSTAT, &stat, 1);
752 #ifdef DEBUG
753 	if (ctdebug & CDB_FILES)
754 		printf("ctintr: before flags %x\n", sc->sc_flags);
755 #endif
756 	if (stat) {
757 		sc->sc_rsc.unit = C_SUNIT(sc->sc_punit);
758 		sc->sc_rsc.cmd = C_STATUS;
759 		hpibsend(ctlr, slave, C_CMD, &sc->sc_rsc, sizeof(sc->sc_rsc));
760 		hpibrecv(ctlr, slave, C_EXEC, &sc->sc_stat,
761 		    sizeof(sc->sc_stat));
762 		hpibrecv(ctlr, slave, C_QSTAT, &stat, 1);
763 #ifdef DEBUG
764 		if (ctdebug & CDB_FILES)
765 			printf("ctintr: return stat 0x%x, A%x F%x blk %ld\n",
766 			       stat, sc->sc_stat.c_aef,
767 			       sc->sc_stat.c_fef, sc->sc_stat.c_blk);
768 #endif
769 		if (stat == 0) {
770 			if (sc->sc_stat.c_aef & (AEF_EOF | AEF_EOV)) {
771 				cteof(sc, bp);
772 				ctaddeof(sc);
773 				goto done;
774 			}
775 			if (sc->sc_stat.c_fef & FEF_PF) {
776 				ctreset(sc);
777 				ctstart(sc);
778 				return;
779 			}
780 			if (sc->sc_stat.c_fef & FEF_REXMT) {
781 				ctstart(sc);
782 				return;
783 			}
784 			if (sc->sc_stat.c_aef & 0x5800) {
785 				if (sc->sc_stat.c_aef & 0x4000)
786 					tprintf(sc->sc_tpr,
787 					    "%s: uninitialized media\n",
788 					    device_xname(sc->sc_dev));
789 				if (sc->sc_stat.c_aef & 0x1000)
790 					tprintf(sc->sc_tpr,
791 					    "%s: not ready\n",
792 					    device_xname(sc->sc_dev));
793 				if (sc->sc_stat.c_aef & 0x0800)
794 					tprintf(sc->sc_tpr,
795 					    "%s: write protect\n",
796 					    device_xname(sc->sc_dev));
797 			} else {
798 				printf("%s err: v%d u%d ru%d bn%ld, ",
799 				    device_xname(sc->sc_dev),
800 				       (sc->sc_stat.c_vu >> 4) & 0xF,
801 				       sc->sc_stat.c_vu & 0xF,
802 				       sc->sc_stat.c_pend,
803 				       sc->sc_stat.c_blk);
804 				printf("R0x%x F0x%x A0x%x I0x%x\n",
805 				       sc->sc_stat.c_ref,
806 				       sc->sc_stat.c_fef,
807 				       sc->sc_stat.c_aef,
808 				       sc->sc_stat.c_ief);
809 			}
810 		} else
811 			printf("%s: request status failed\n",
812 			    device_xname(sc->sc_dev));
813 		bp->b_error = EIO;
814 		goto done;
815 	} else
816 		bp->b_resid = 0;
817 	if (sc->sc_flags & CTF_CMD) {
818 		switch (sc->sc_cmd) {
819 		case MTFSF:
820 			sc->sc_flags &= ~(CTF_BEOF|CTF_AEOF);
821 			sc->sc_blkno += CTBTOK(sc->sc_resid);
822 			ctstart(sc);
823 			return;
824 		case MTBSF:
825 			sc->sc_flags &= ~(CTF_AEOF|CTF_BEOF|CTF_EOT);
826 			break;
827 		case MTBSR:
828 			sc->sc_flags &= ~CTF_BEOF;
829 			if (sc->sc_flags & CTF_EOT) {
830 				sc->sc_flags |= CTF_AEOF;
831 				sc->sc_flags &= ~CTF_EOT;
832 			} else if (sc->sc_flags & CTF_AEOF) {
833 				sc->sc_flags |= CTF_BEOF;
834 				sc->sc_flags &= ~CTF_AEOF;
835 			}
836 			break;
837 		case MTWEOF:
838 			sc->sc_flags &= ~CTF_BEOF;
839 			if (sc->sc_flags & (CTF_AEOF|CTF_EOT)) {
840 				sc->sc_flags |= CTF_EOT;
841 				sc->sc_flags &= ~CTF_AEOF;
842 			} else
843 				sc->sc_flags |= CTF_AEOF;
844 			break;
845 		case MTREW:
846 		case MTOFFL:
847 			sc->sc_flags &= ~(CTF_BEOF|CTF_AEOF|CTF_EOT);
848 			break;
849 		}
850 	} else {
851 		sc->sc_flags &= ~CTF_AEOF;
852 		sc->sc_blkno += CTBTOK(sc->sc_resid);
853 	}
854 done:
855 #ifdef DEBUG
856 	if (ctdebug & CDB_FILES)
857 		printf("ctintr: after flags %x\n", sc->sc_flags);
858 #endif
859 	ctdone(sc, bp);
860 }
861 
862 static void
863 ctdone(struct ct_softc *sc, struct buf *bp)
864 {
865 
866 	(void)BUFQ_GET(sc->sc_tab);
867 	biodone(bp);
868 	hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
869 	if (BUFQ_PEEK(sc->sc_tab) == NULL) {
870 		sc->sc_active = 0;
871 		return;
872 	}
873 	ctustart(sc);
874 }
875 
876 static int
877 ctread(dev_t dev, struct uio *uio, int flags)
878 {
879 
880 	return physio(ctstrategy, NULL, dev, B_READ, minphys, uio);
881 }
882 
883 static int
884 ctwrite(dev_t dev, struct uio *uio, int flags)
885 {
886 
887 	/* XXX: check for hardware write-protect? */
888 	return physio(ctstrategy, NULL, dev, B_WRITE, minphys, uio);
889 }
890 
891 /*ARGSUSED*/
892 static int
893 ctioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
894 {
895 	struct mtop *op;
896 	int cnt;
897 
898 	switch (cmd) {
899 
900 	case MTIOCTOP:
901 		op = (struct mtop *)data;
902 		switch(op->mt_op) {
903 
904 		case MTWEOF:
905 		case MTFSF:
906 		case MTBSR:
907 		case MTBSF:
908 		case MTFSR:
909 			cnt = op->mt_count;
910 			break;
911 
912 		case MTREW:
913 		case MTOFFL:
914 			cnt = 1;
915 			break;
916 
917 		default:
918 			return EINVAL;
919 		}
920 		ctcommand(dev, op->mt_op, cnt);
921 		break;
922 
923 	case MTIOCGET:
924 		break;
925 
926 	default:
927 		return EINVAL;
928 	}
929 	return 0;
930 }
931 
932 static void
933 ctaddeof(struct ct_softc *sc)
934 {
935 
936 	if (sc->sc_eofp == EOFS - 1)
937 		sc->sc_eofs[EOFS - 1]++;
938 	else {
939 		sc->sc_eofp++;
940 		if (sc->sc_eofp == EOFS - 1)
941 			sc->sc_eofs[EOFS - 1] = EOFS;
942 		else
943 			/* save blkno */
944 			sc->sc_eofs[sc->sc_eofp] = sc->sc_blkno - 1;
945 	}
946 #ifdef DEBUG
947 	if (ctdebug & CT_BSF)
948 		printf("%s: add eof pos %d blk %d\n",
949 		       device_xname(sc->sc_dev), sc->sc_eofp,
950 		       sc->sc_eofs[sc->sc_eofp]);
951 #endif
952 }
953