1/*	$NetBSD: fd.c,v 1.40 2009/09/27 05:29:20 tsutsui Exp $	*/
2/*	$OpenBSD: fd.c,v 1.6 1998/10/03 21:18:57 millert Exp $	*/
3/*	NetBSD: fd.c,v 1.78 1995/07/04 07:23:09 mycroft Exp 	*/
4
5/*-
6 * Copyright (c) 1998 The NetBSD Foundation, Inc.
7 * All rights reserved.
8 *
9 * This code is derived from software contributed to The NetBSD Foundation
10 * by Charles M. Hannum.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/*-
35 * Copyright (c) 1990 The Regents of the University of California.
36 * All rights reserved.
37 *
38 * This code is derived from software contributed to Berkeley by
39 * Don Ahn.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 *    notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 *    notice, this list of conditions and the following disclaimer in the
48 *    documentation and/or other materials provided with the distribution.
49 * 3. Neither the name of the University nor the names of its contributors
50 *    may be used to endorse or promote products derived from this software
51 *    without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 *	@(#)fd.c	7.4 (Berkeley) 5/25/91
66 */
67
68#include <sys/cdefs.h>
69__KERNEL_RCSID(0, "$NetBSD: fd.c,v 1.40 2009/09/27 05:29:20 tsutsui Exp $");
70
71#include <sys/param.h>
72#include <sys/systm.h>
73#include <sys/callout.h>
74#include <sys/kernel.h>
75#include <sys/conf.h>
76#include <sys/file.h>
77#include <sys/ioctl.h>
78#include <sys/device.h>
79#include <sys/disklabel.h>
80#include <sys/disk.h>
81#include <sys/buf.h>
82#include <sys/bufq.h>
83#include <sys/uio.h>
84#include <sys/syslog.h>
85#include <sys/queue.h>
86
87#include <uvm/uvm_extern.h>
88
89#include <dev/cons.h>
90
91#include <sys/bus.h>
92#include <machine/cpu.h>
93
94#include <arc/jazz/fdreg.h>
95#include <arc/jazz/fdcvar.h>
96
97#include "ioconf.h"
98#include "locators.h"
99
100#define FDUNIT(dev)	DISKUNIT(dev)
101#define FDTYPE(dev)	DISKPART(dev)
102
103/* controller driver configuration */
104static int fdprint(void *, const char *);
105
106/*
107 * Floppies come in various flavors, e.g., 1.2MB vs 1.44MB; here is how
108 * we tell them apart.
109 */
110struct fd_type {
111	int	sectrac;	/* sectors per track */
112	int	heads;		/* number of heads */
113	int	seccyl;		/* sectors per cylinder */
114	int	secsize;	/* size code for sectors */
115	int	datalen;	/* data len when secsize = 0 */
116	int	steprate;	/* step rate and head unload time */
117	int	gap1;		/* gap len between sectors */
118	int	gap2;		/* formatting gap */
119	int	cyls;		/* total num of cylinders */
120	int	size;		/* size of disk in sectors */
121	int	step;		/* steps per cylinder */
122	int	rate;		/* transfer speed code */
123	const char *name;
124};
125
126/* The order of entries in the following table is important -- BEWARE! */
127const static struct fd_type fd_types[] = {
128	/* 1.44MB diskette */
129	{ 18,2,36,2,0xff,0xcf,0x1b,0x6c,80,2880,1,FDC_500KBPS,"1.44MB"    },
130	/* 1.2 MB AT-diskettes */
131	{ 15,2,30,2,0xff,0xdf,0x1b,0x54,80,2400,1,FDC_500KBPS, "1.2MB"    },
132	/* 360kB in 1.2MB drive */
133	{  9,2,18,2,0xff,0xdf,0x23,0x50,40, 720,2,FDC_300KBPS, "360KB/AT" },
134	/* 360kB PC diskettes */
135	{  9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,1,FDC_250KBPS, "360KB/PC" },
136	/* 3.5" 720kB diskette */
137	{  9,2,18,2,0xff,0xdf,0x2a,0x50,80,1440,1,FDC_250KBPS, "720KB"    },
138	/* 720kB in 1.2MB drive */
139	{  9,2,18,2,0xff,0xdf,0x23,0x50,80,1440,1,FDC_300KBPS, "720KB/x"  },
140	/* 360kB in 720kB drive */
141	{  9,2,18,2,0xff,0xdf,0x2a,0x50,40, 720,2,FDC_250KBPS, "360KB/x"  },
142};
143
144/* software state, per disk (with up to 4 disks per ctlr) */
145struct fd_softc {
146	device_t sc_dev;
147	struct disk sc_dk;
148
149	const struct fd_type *sc_deftype; /* default type descriptor */
150	struct fd_type *sc_type;	/* current type descriptor */
151	struct fd_type sc_type_copy;	/* copy for fiddling when formatting */
152
153	struct callout sc_motoron_ch;
154	struct callout sc_motoroff_ch;
155
156	daddr_t	sc_blkno;	/* starting block number */
157	int sc_bcount;		/* byte count left */
158	int sc_opts;		/* user-set options */
159	int sc_skip;		/* bytes already transferred */
160	int sc_nblks;		/* number of blocks currently transferring */
161	int sc_nbytes;		/* number of bytes currently transferring */
162
163	int sc_drive;		/* physical unit number */
164	int sc_flags;
165#define	FD_OPEN		0x01		/* it's open */
166#define	FD_MOTOR	0x02		/* motor should be on */
167#define	FD_MOTOR_WAIT	0x04		/* motor coming up */
168	int sc_cylin;		/* where we think the head is */
169
170	TAILQ_ENTRY(fd_softc) sc_drivechain;
171	int sc_ops;		/* I/O ops since last switch */
172	struct bufq_state *sc_q;/* pending I/O requests */
173	int sc_active;		/* number of active I/O operations */
174};
175
176/* floppy driver configuration */
177static int fdprobe(device_t, cfdata_t, void *);
178static void fdattach(device_t, device_t, void *);
179
180CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc), fdprobe, fdattach, NULL, NULL);
181
182dev_type_open(fdopen);
183dev_type_close(fdclose);
184dev_type_read(fdread);
185dev_type_write(fdwrite);
186dev_type_ioctl(fdioctl);
187dev_type_strategy(fdstrategy);
188
189const struct bdevsw fd_bdevsw = {
190	fdopen, fdclose, fdstrategy, fdioctl, nodump, nosize, D_DISK
191};
192
193const struct cdevsw fd_cdevsw = {
194	fdopen, fdclose, fdread, fdwrite, fdioctl,
195	nostop, notty, nopoll, nommap, nokqfilter, D_DISK
196};
197
198static void fdstart(struct fd_softc *);
199
200struct dkdriver fddkdriver = { fdstrategy };
201
202static bool fd_shutdown(device_t, int);
203#if 0
204static const struct fd_type *fd_nvtotype(char *, int, int);
205#endif
206static void fd_set_motor(struct fdc_softc *, int);
207static void fd_motor_off(void *);
208static void fd_motor_on(void *);
209static int fdcresult(struct fdc_softc *);
210static void fdcstart(struct fdc_softc *);
211static void fdcstatus(device_t, int, const char *);
212static void fdctimeout(void *);
213static void fdcpseudointr(void *);
214static void fdcretry(struct fdc_softc *);
215static void fdfinish(struct fd_softc *, struct buf *);
216static inline const struct fd_type *fd_dev_to_type(struct fd_softc *, dev_t);
217static void fd_mountroot_hook(device_t);
218
219/*
220 * Arguments passed between fdcattach and fdprobe.
221 */
222struct fdc_attach_args {
223	int fa_drive;
224	const struct fd_type *fa_deftype;
225};
226
227/*
228 * Print the location of a disk drive (called just before attaching the
229 * the drive).  If `fdc' is not NULL, the drive was found but was not
230 * in the system config file; print the drive name as well.
231 * Return QUIET (config_find ignores this if the device was configured) to
232 * avoid printing `fdN not configured' messages.
233 */
234static int
235fdprint(void *aux, const char *fdc)
236{
237	struct fdc_attach_args *fa = aux;
238
239	if (fdc == NULL)
240		aprint_normal(" drive %d", fa->fa_drive);
241	return QUIET;
242}
243
244void
245fdcattach(struct fdc_softc *fdc)
246{
247	struct fdc_attach_args fa;
248	bus_space_tag_t iot;
249	bus_space_handle_t ioh;
250	int type;
251
252	iot = fdc->sc_iot;
253	ioh = fdc->sc_ioh;
254	callout_init(&fdc->sc_timo_ch, 0);
255	callout_init(&fdc->sc_intr_ch, 0);
256
257	fdc->sc_state = DEVIDLE;
258	TAILQ_INIT(&fdc->sc_drives);
259
260	/*
261	 * No way yet to determine default disk types.
262	 * we assume 1.44 3.5" type for the moment.
263	 */
264	type = 0;
265
266	/* physical limit: two drives per controller. */
267	for (fa.fa_drive = 0; fa.fa_drive < 2; fa.fa_drive++) {
268		fa.fa_deftype = &fd_types[type];
269		(void)config_found(fdc->sc_dev, (void *)&fa, fdprint);
270	}
271}
272
273static int
274fdprobe(device_t parent, cfdata_t cf , void *aux)
275{
276	struct fdc_softc *fdc = device_private(parent);
277	struct fdc_attach_args *fa = aux;
278	int drive = fa->fa_drive;
279	bus_space_tag_t iot = fdc->sc_iot;
280	bus_space_handle_t ioh = fdc->sc_ioh;
281	int n;
282
283	if (cf->cf_loc[FDCCF_DRIVE] != FDCCF_DRIVE_DEFAULT &&
284	    cf->cf_loc[FDCCF_DRIVE] != drive)
285		return 0;
286
287	/* select drive and turn on motor */
288	bus_space_write_1(iot, ioh, FDOUT, drive | FDO_FRST | FDO_MOEN(drive));
289	/* wait for motor to spin up */
290	delay(250000);
291	out_fdc(iot, ioh, NE7CMD_RECAL);
292	out_fdc(iot, ioh, drive);
293	/* wait for recalibrate */
294	delay(2000000);
295	out_fdc(iot, ioh, NE7CMD_SENSEI);
296	n = fdcresult(fdc);
297#ifdef FD_DEBUG
298	{
299		int i;
300		aprint_debug("%s: status", __func__);
301		for (i = 0; i < n; i++)
302			aprint_debug(" %x", fdc->sc_status[i]);
303		aprint_debug("\n");
304	}
305#endif
306	if (n != 2 || (fdc->sc_status[0] & 0xf8) != 0x20)
307		return 0;
308	/* turn off motor */
309	bus_space_write_1(iot, ioh, FDOUT, FDO_FRST);
310
311	return 1;
312}
313
314/*
315 * Controller is working, and drive responded.  Attach it.
316 */
317void
318fdattach(device_t parent, device_t self, void *aux)
319{
320	struct fdc_softc *fdc = device_private(parent);
321	struct fd_softc *fd = device_private(self);
322	struct fdc_attach_args *fa = aux;
323	const struct fd_type *type = fa->fa_deftype;
324	int drive = fa->fa_drive;
325
326	fd->sc_dev = self;
327
328	callout_init(&fd->sc_motoron_ch, 0);
329	callout_init(&fd->sc_motoroff_ch, 0);
330
331	/* XXX Allow `flags' to override device type? */
332
333	if (type)
334		printf(": %s, %d cyl, %d head, %d sec\n", type->name,
335		    type->cyls, type->heads, type->sectrac);
336	else
337		printf(": density unknown\n");
338
339	bufq_alloc(&fd->sc_q, "disksort", BUFQ_SORT_CYLINDER);
340	fd->sc_cylin = -1;
341	fd->sc_drive = drive;
342	fd->sc_deftype = type;
343	fdc->sc_fd[drive] = fd;
344
345	/*
346	 * Initialize and attach the disk structure.
347	 */
348	disk_init(&fd->sc_dk, device_xname(fd->sc_dev), &fddkdriver);
349	disk_attach(&fd->sc_dk);
350
351	/* Establish a mountroot hook. */
352	mountroothook_establish(fd_mountroot_hook, fd->sc_dev);
353
354	/* Needed to power off if the motor is on when we halt. */
355	if (!pmf_device_register1(self, NULL, NULL, fd_shutdown))
356		aprint_error_dev(self, "couldn't establish power handler\n");
357}
358
359bool
360fd_shutdown(device_t self, int howto)
361{
362	struct fd_softc *fd;
363
364	fd = device_private(self);
365	fd_motor_off(fd);
366
367	return true;
368}
369
370#if 0
371/*
372 * Translate nvram type into internal data structure.  Return NULL for
373 * none/unknown/unusable.
374 */
375static const struct fd_type *
376fd_nvtotype(char *fdc, int nvraminfo, int drive)
377{
378	int type;
379
380	type = (drive == 0 ? nvraminfo : nvraminfo << 4) & 0xf0;
381#if 0
382	switch (type) {
383	case NVRAM_DISKETTE_NONE:
384		return NULL;
385	case NVRAM_DISKETTE_12M:
386		return &fd_types[1];
387	case NVRAM_DISKETTE_TYPE5:
388	case NVRAM_DISKETTE_TYPE6:
389		/* XXX We really ought to handle 2.88MB format. */
390	case NVRAM_DISKETTE_144M:
391		return &fd_types[0];
392	case NVRAM_DISKETTE_360K:
393		return &fd_types[3];
394	case NVRAM_DISKETTE_720K:
395		return &fd_types[4];
396	default:
397		printf("%s: drive %d: unknown device type 0x%x\n",
398		    fdc, drive, type);
399		return NULL;
400	}
401#else
402	return &fd_types[0]; /* Use only 1.44 for now */
403#endif
404}
405#endif
406
407static inline const struct fd_type *
408fd_dev_to_type(struct fd_softc *fd, dev_t dev)
409{
410	int type = FDTYPE(dev);
411
412	if (type > __arraycount(fd_types))
413		return NULL;
414	return type ? &fd_types[type - 1] : fd->sc_deftype;
415}
416
417void
418fdstrategy(struct buf *bp)
419{
420	struct fd_softc *fd = device_lookup_private(&fd_cd, FDUNIT(bp->b_dev));
421	int sz;
422	int s;
423
424	/* Valid unit, controller, and request? */
425	if (bp->b_blkno < 0 ||
426	    (bp->b_bcount % FDC_BSIZE) != 0) {
427		bp->b_error = EINVAL;
428		goto done;
429	}
430
431	/* If it's a null transfer, return immediately. */
432	if (bp->b_bcount == 0)
433		goto done;
434
435	sz = howmany(bp->b_bcount, FDC_BSIZE);
436
437	if (bp->b_blkno + sz > fd->sc_type->size) {
438		sz = fd->sc_type->size - bp->b_blkno;
439		if (sz == 0) {
440			/* If exactly at end of disk, return EOF. */
441			goto done;
442		}
443		if (sz < 0) {
444			/* If past end of disk, return EINVAL. */
445			bp->b_error = EINVAL;
446			goto done;
447		}
448		/* Otherwise, truncate request. */
449		bp->b_bcount = sz << DEV_BSHIFT;
450	}
451
452	bp->b_rawblkno = bp->b_blkno;
453	bp->b_cylinder =
454	    bp->b_blkno / (FDC_BSIZE / DEV_BSIZE) / fd->sc_type->seccyl;
455
456#ifdef FD_DEBUG
457	printf("%s: b_blkno %" PRId64 " b_bcount %ld blkno %" PRId64
458	    " cylin %ld sz %d\n", __func__,
459	    bp->b_blkno, bp->b_bcount, fd->sc_blkno, bp->b_cylinder, sz);
460#endif
461
462	/* Queue transfer on drive, activate drive and controller if idle. */
463	s = splbio();
464	bufq_put(fd->sc_q, bp);
465	callout_stop(&fd->sc_motoroff_ch);		/* a good idea */
466	if (fd->sc_active == 0)
467		fdstart(fd);
468#ifdef DIAGNOSTIC
469	else {
470		struct fdc_softc *fdc =
471		    device_private(device_parent(fd->sc_dev));
472		if (fdc->sc_state == DEVIDLE) {
473			printf("%s: controller inactive\n", __func__);
474			fdcstart(fdc);
475		}
476	}
477#endif
478	splx(s);
479	return;
480
481 done:
482	/* Toss transfer; we're done early. */
483	bp->b_resid = bp->b_bcount;
484	biodone(bp);
485}
486
487void
488fdstart(struct fd_softc *fd)
489{
490	struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));
491	int active = TAILQ_FIRST(&fdc->sc_drives) != 0;
492
493	/* Link into controller queue. */
494	fd->sc_active = 1;
495	TAILQ_INSERT_TAIL(&fdc->sc_drives, fd, sc_drivechain);
496
497	/* If controller not already active, start it. */
498	if (!active)
499		fdcstart(fdc);
500}
501
502void
503fdfinish(struct fd_softc *fd, struct buf *bp)
504{
505	struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));
506
507	/*
508	 * Move this drive to the end of the queue to give others a `fair'
509	 * chance.  We only force a switch if N operations are completed while
510	 * another drive is waiting to be serviced, since there is a long motor
511	 * startup delay whenever we switch.
512	 */
513	(void)bufq_get(fd->sc_q);
514	if (TAILQ_NEXT(fd, sc_drivechain) && ++fd->sc_ops >= 8) {
515		fd->sc_ops = 0;
516		TAILQ_REMOVE(&fdc->sc_drives, fd, sc_drivechain);
517		if (bufq_peek(fd->sc_q) != NULL)
518			TAILQ_INSERT_TAIL(&fdc->sc_drives, fd, sc_drivechain);
519		else
520			fd->sc_active = 0;
521	}
522	bp->b_resid = fd->sc_bcount;
523	fd->sc_skip = 0;
524	biodone(bp);
525	/* turn off motor 5s from now */
526	callout_reset(&fd->sc_motoroff_ch, 5 * hz, fd_motor_off, fd);
527	fdc->sc_state = DEVIDLE;
528}
529
530int
531fdread(dev_t dev, struct uio *uio, int flags)
532{
533
534	return physio(fdstrategy, NULL, dev, B_READ, minphys, uio);
535}
536
537int
538fdwrite(dev_t dev, struct uio *uio, int flags)
539{
540
541	return physio(fdstrategy, NULL, dev, B_WRITE, minphys, uio);
542}
543
544void
545fd_set_motor(struct fdc_softc *fdc, int reset)
546{
547	struct fd_softc *fd;
548	u_char status;
549	int n;
550
551	if ((fd = TAILQ_FIRST(&fdc->sc_drives)) != NULL)
552		status = fd->sc_drive;
553	else
554		status = 0;
555	if (!reset)
556		status |= FDO_FRST | FDO_FDMAEN;
557	for (n = 0; n < 4; n++)
558		if ((fd = fdc->sc_fd[n]) && (fd->sc_flags & FD_MOTOR))
559			status |= FDO_MOEN(n);
560	bus_space_write_1(fdc->sc_iot, fdc->sc_ioh, FDOUT, status);
561}
562
563void
564fd_motor_off(void *arg)
565{
566	struct fd_softc *fd = arg;
567	struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));
568	int s;
569
570	s = splbio();
571	fd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT);
572	fd_set_motor(fdc, 0);
573	splx(s);
574}
575
576void
577fd_motor_on(void *arg)
578{
579	struct fd_softc *fd = arg;
580	struct fdc_softc *fdc = device_private(device_parent(fd->sc_dev));
581	int s;
582
583	s = splbio();
584	fd->sc_flags &= ~FD_MOTOR_WAIT;
585	if ((TAILQ_FIRST(&fdc->sc_drives) == fd) &&
586	    (fdc->sc_state == MOTORWAIT))
587		(void)fdcintr(fdc);
588	splx(s);
589}
590
591int
592fdcresult(struct fdc_softc *fdc)
593{
594	bus_space_tag_t iot = fdc->sc_iot;
595	bus_space_handle_t ioh = fdc->sc_ioh;
596	u_char i;
597	int j, n = 0;
598
599	for (j = 100000; j; j--) {
600		i = bus_space_read_1(iot, ioh, FDSTS) &
601		    (NE7_DIO | NE7_RQM | NE7_CB);
602		if (i == NE7_RQM)
603			return n;
604		if (i == (NE7_DIO | NE7_RQM | NE7_CB)) {
605			if (n >= sizeof(fdc->sc_status)) {
606				log(LOG_ERR, "%s: overrun\n", __func__);
607				return -1;
608			}
609			fdc->sc_status[n++] =
610			    bus_space_read_1(iot, ioh, FDDATA);
611		}
612		delay(10);
613	}
614	log(LOG_ERR, "%s: timeout\n", __func__);
615	return -1;
616}
617
618int
619out_fdc(bus_space_tag_t iot, bus_space_handle_t ioh, uint8_t x)
620{
621	int i = 100000;
622
623	while ((bus_space_read_1(iot, ioh, FDSTS) & NE7_DIO) && i-- > 0);
624	if (i <= 0)
625		return -1;
626	while ((bus_space_read_1(iot, ioh, FDSTS) & NE7_RQM) == 0 && i-- > 0);
627	if (i <= 0)
628		return -1;
629	bus_space_write_1(iot, ioh, FDDATA, x);
630	return 0;
631}
632
633int
634fdopen(dev_t dev, int flags, int mode, struct lwp *l)
635{
636	struct fd_softc *fd;
637	const struct fd_type *type;
638
639	fd = device_lookup_private(&fd_cd, FDUNIT(dev));
640	if (fd == NULL)
641		return ENXIO;
642
643	type = fd_dev_to_type(fd, dev);
644	if (type == NULL)
645		return ENXIO;
646
647	if ((fd->sc_flags & FD_OPEN) != 0 &&
648	    memcmp(fd->sc_type, type, sizeof(*type)))
649		return EBUSY;
650
651	fd->sc_type_copy = *type;
652	fd->sc_type = &fd->sc_type_copy;
653	fd->sc_cylin = -1;
654	fd->sc_flags |= FD_OPEN;
655
656	return 0;
657}
658
659int
660fdclose(dev_t dev, int flags, int mode, struct lwp *l)
661{
662	struct fd_softc *fd = device_lookup_private(&fd_cd, FDUNIT(dev));
663
664	fd->sc_flags &= ~FD_OPEN;
665	return 0;
666}
667
668void
669fdcstart(struct fdc_softc *fdc)
670{
671
672#ifdef DIAGNOSTIC
673	/* only got here if controller's drive queue was inactive; should
674	   be in idle state */
675	if (fdc->sc_state != DEVIDLE) {
676		printf("%s: not idle\n", __func__);
677		return;
678	}
679#endif
680	(void)fdcintr(fdc);
681}
682
683static void
684fdcpstatus(int n, struct fdc_softc *fdc)
685{
686	char bits[64];
687
688	switch (n) {
689	case 0:
690		printf("\n");
691		break;
692	case 2:
693		snprintb(bits, sizeof(bits), NE7_ST0BITS, fdc->sc_status[0]);
694		printf(" (st0 %s cyl %d)\n", bits, fdc->sc_status[1]);
695		break;
696	case 7:
697		snprintb(bits, sizeof(bits), NE7_ST0BITS, fdc->sc_status[0]);
698		printf(" (st0 %s", bits);
699		snprintb(bits, sizeof(bits), NE7_ST1BITS, fdc->sc_status[1]);
700		printf(" st1 %s", bits);
701		snprintb(bits, sizeof(bits), NE7_ST2BITS, fdc->sc_status[2]);
702		printf(" st2 %s", bits);
703		printf(" cyl %d head %d sec %d)\n",
704		    fdc->sc_status[3], fdc->sc_status[4], fdc->sc_status[5]);
705		break;
706#ifdef DIAGNOSTIC
707	default:
708		printf("\nfdcstatus: weird size");
709		break;
710#endif
711	}
712}
713
714void
715fdcstatus(device_t dev, int n, const char *s)
716{
717	struct fdc_softc *fdc = device_private(device_parent(dev));
718
719	if (n == 0) {
720		out_fdc(fdc->sc_iot, fdc->sc_ioh, NE7CMD_SENSEI);
721		(void)fdcresult(fdc);
722		n = 2;
723	}
724
725	printf("%s: %s", device_xname(dev), s);
726	fdcpstatus(n, fdc);
727}
728
729void
730fdctimeout(void *arg)
731{
732	struct fdc_softc *fdc = arg;
733	struct fd_softc *fd = TAILQ_FIRST(&fdc->sc_drives);
734	int s;
735
736	s = splbio();
737#ifdef DEBUG
738	log(LOG_ERR, "%s: state %d\n", __func__, fdc->sc_state);
739#endif
740	fdcstatus(fd->sc_dev, 0, "timeout");
741
742	if (bufq_peek(fd->sc_q) != NULL)
743		fdc->sc_state++;
744	else
745		fdc->sc_state = DEVIDLE;
746
747	(void)fdcintr(fdc);
748	splx(s);
749}
750
751void
752fdcpseudointr(void *arg)
753{
754	int s;
755
756	/* Just ensure it has the right spl. */
757	s = splbio();
758	(void)fdcintr(arg);
759	splx(s);
760}
761
762int
763fdcintr(void *arg)
764{
765	struct fdc_softc *fdc = arg;
766#define	st0	fdc->sc_status[0]
767#define	cyl	fdc->sc_status[1]
768	struct fd_softc *fd;
769	struct buf *bp;
770	bus_space_tag_t iot = fdc->sc_iot;
771	bus_space_handle_t ioh = fdc->sc_ioh;
772	int read, head, sec, i, nblks;
773	struct fd_type *type;
774
775 loop:
776	/* Is there a drive for the controller to do a transfer with? */
777	fd = TAILQ_FIRST(&fdc->sc_drives);
778	if (fd == NULL) {
779		fdc->sc_state = DEVIDLE;
780		return 1;
781	}
782
783	/* Is there a transfer to this drive?  If not, deactivate drive. */
784	bp = bufq_peek(fd->sc_q);
785	if (bp == NULL) {
786		fd->sc_ops = 0;
787		TAILQ_REMOVE(&fdc->sc_drives, fd, sc_drivechain);
788		fd->sc_active = 0;
789		goto loop;
790	}
791
792	switch (fdc->sc_state) {
793	case DEVIDLE:
794		fdc->sc_errors = 0;
795		fd->sc_skip = 0;
796		fd->sc_bcount = bp->b_bcount;
797		fd->sc_blkno = bp->b_blkno / (FDC_BSIZE / DEV_BSIZE);
798		callout_stop(&fd->sc_motoroff_ch);
799		if ((fd->sc_flags & FD_MOTOR_WAIT) != 0) {
800			fdc->sc_state = MOTORWAIT;
801			return 1;
802		}
803		if ((fd->sc_flags & FD_MOTOR) == 0) {
804			/* Turn on the motor, being careful about pairing. */
805			struct fd_softc *ofd = fdc->sc_fd[fd->sc_drive ^ 1];
806			if (ofd && ofd->sc_flags & FD_MOTOR) {
807				callout_stop(&ofd->sc_motoroff_ch);
808				ofd->sc_flags &= ~(FD_MOTOR | FD_MOTOR_WAIT);
809			}
810			fd->sc_flags |= FD_MOTOR | FD_MOTOR_WAIT;
811			fd_set_motor(fdc, 0);
812			fdc->sc_state = MOTORWAIT;
813			/* Allow .25s for motor to stabilize. */
814			callout_reset(&fd->sc_motoron_ch, hz / 4,
815			    fd_motor_on, fd);
816			return 1;
817		}
818		/* Make sure the right drive is selected. */
819		fd_set_motor(fdc, 0);
820
821		/* fall through */
822	case DOSEEK:
823 doseek:
824		if (fd->sc_cylin == bp->b_cylinder)
825			goto doio;
826
827		out_fdc(iot, ioh, NE7CMD_SPECIFY);/* specify command */
828		out_fdc(iot, ioh, fd->sc_type->steprate);
829		out_fdc(iot, ioh, 6);		/* XXX head load time == 6ms */
830
831		out_fdc(iot, ioh, NE7CMD_SEEK);	/* seek function */
832		out_fdc(iot, ioh, fd->sc_drive); /* drive number */
833		out_fdc(iot, ioh, bp->b_cylinder * fd->sc_type->step);
834
835		fd->sc_cylin = -1;
836		fdc->sc_state = SEEKWAIT;
837
838		iostat_seek(fd->sc_dk.dk_stats);
839		disk_busy(&fd->sc_dk);
840
841		callout_reset(&fdc->sc_timo_ch, 4 * hz, fdctimeout, fdc);
842		return 1;
843
844	case DOIO:
845 doio:
846		type = fd->sc_type;
847		sec = fd->sc_blkno % type->seccyl;
848		nblks = type->seccyl - sec;
849		nblks = min(nblks, fd->sc_bcount / FDC_BSIZE);
850		nblks = min(nblks, fdc->sc_maxiosize / FDC_BSIZE);
851		fd->sc_nblks = nblks;
852		fd->sc_nbytes = nblks * FDC_BSIZE;
853		head = sec / type->sectrac;
854		sec -= head * type->sectrac;
855#ifdef DIAGNOSTIC
856		{
857			int block;
858			block = (fd->sc_cylin * type->heads + head) *
859			    type->sectrac + sec;
860			if (block != fd->sc_blkno) {
861				printf("%s: block %d != blkno %" PRId64
862				    "\n", __func__, block, fd->sc_blkno);
863#ifdef DDB
864				 Debugger();
865#endif
866			}
867		}
868#endif
869		read = (bp->b_flags & B_READ) != 0;
870		FDCDMA_START(fdc, (uint8_t *)bp->b_data + fd->sc_skip,
871		    fd->sc_nbytes, read);
872		bus_space_write_1(iot, ioh, FDCTL, type->rate);
873#ifdef FD_DEBUG
874		printf("%s: %s drive %d track %d head %d sec %d nblks %d\n",
875		    __func__, read ? "read" : "write", fd->sc_drive,
876		    fd->sc_cylin, head, sec, nblks);
877#endif
878		if (read)
879			out_fdc(iot, ioh, NE7CMD_READ);	/* READ */
880		else
881			out_fdc(iot, ioh, NE7CMD_WRITE);/* WRITE */
882		out_fdc(iot, ioh, (head << 2) | fd->sc_drive);
883		out_fdc(iot, ioh, fd->sc_cylin);	/* track */
884		out_fdc(iot, ioh, head);
885		out_fdc(iot, ioh, sec + 1);		/* sector + 1 */
886		out_fdc(iot, ioh, type->secsize);	/* sector size */
887		out_fdc(iot, ioh, type->sectrac);	/* sectors/track */
888		out_fdc(iot, ioh, type->gap1);		/* gap1 size */
889		out_fdc(iot, ioh, type->datalen);	/* data length */
890		fdc->sc_state = IOCOMPLETE;
891
892		disk_busy(&fd->sc_dk);
893
894		/* allow 2 seconds for operation */
895		callout_reset(&fdc->sc_timo_ch, 2 * hz, fdctimeout, fdc);
896		return 1;				/* will return later */
897
898	case SEEKWAIT:
899		callout_stop(&fdc->sc_timo_ch);
900		fdc->sc_state = SEEKCOMPLETE;
901		/* allow 1/50 second for heads to settle */
902		callout_reset(&fdc->sc_intr_ch, hz / 50, fdcpseudointr, fdc);
903		return 1;
904
905	case SEEKCOMPLETE:
906		disk_unbusy(&fd->sc_dk, 0, 0);
907
908		/* Make sure seek really happened. */
909		out_fdc(iot, ioh, NE7CMD_SENSEI);
910		if (fdcresult(fdc) != 2 || (st0 & 0xf8) != 0x20 ||
911		    cyl != bp->b_cylinder * fd->sc_type->step) {
912#ifdef FD_DEBUG
913			fdcstatus(fd->sc_dev, 2, "seek failed");
914#endif
915			fdcretry(fdc);
916			goto loop;
917		}
918		fd->sc_cylin = bp->b_cylinder;
919		goto doio;
920
921	case IOTIMEDOUT:
922		FDCDMA_ABORT(fdc);
923
924	case SEEKTIMEDOUT:
925	case RECALTIMEDOUT:
926	case RESETTIMEDOUT:
927		fdcretry(fdc);
928		goto loop;
929
930	case IOCOMPLETE: /* IO DONE, post-analyze */
931		callout_stop(&fdc->sc_timo_ch);
932
933		disk_unbusy(&fd->sc_dk, (bp->b_bcount - bp->b_resid),
934		    (bp->b_flags & B_READ));
935
936		i = fdcresult(fdc);
937		if (i != 7 || (st0 & 0xf8) != 0) {
938			FDCDMA_ABORT(fdc);
939#ifdef FD_DEBUG
940			fdcstatus(fd->sc_dev, 7, bp->b_flags & B_READ ?
941			    "read failed" : "write failed");
942			printf("blkno %" PRId64 " nblks %d\n",
943			    fd->sc_blkno, fd->sc_nblks);
944#endif
945			fdcretry(fdc);
946			goto loop;
947		}
948		FDCDMA_DONE(fdc);
949		if (fdc->sc_errors) {
950			diskerr(bp, "fd", "soft error (corrected)", LOG_PRINTF,
951			    fd->sc_skip / FDC_BSIZE, NULL);
952			printf("\n");
953			fdc->sc_errors = 0;
954		}
955		fd->sc_blkno += fd->sc_nblks;
956		fd->sc_skip += fd->sc_nbytes;
957		fd->sc_bcount -= fd->sc_nbytes;
958		if (fd->sc_bcount > 0) {
959			bp->b_cylinder = fd->sc_blkno / fd->sc_type->seccyl;
960			goto doseek;
961		}
962		fdfinish(fd, bp);
963		goto loop;
964
965	case DORESET:
966		/* try a reset, keep motor on */
967		fd_set_motor(fdc, 1);
968		delay(100);
969		fd_set_motor(fdc, 0);
970		fdc->sc_state = RESETCOMPLETE;
971		callout_reset(&fdc->sc_timo_ch, hz / 2, fdctimeout, fdc);
972		return 1;			/* will return later */
973
974	case RESETCOMPLETE:
975		callout_stop(&fdc->sc_timo_ch);
976		/* clear the controller output buffer */
977		for (i = 0; i < 4; i++) {
978			out_fdc(iot, ioh, NE7CMD_SENSEI);
979			(void)fdcresult(fdc);
980		}
981
982		/* fall through */
983	case DORECAL:
984		out_fdc(iot, ioh, NE7CMD_RECAL); /* recalibrate function */
985		out_fdc(iot, ioh, fd->sc_drive);
986		fdc->sc_state = RECALWAIT;
987		callout_reset(&fdc->sc_timo_ch, 5 * hz, fdctimeout, fdc);
988		return 1;			/* will return later */
989
990	case RECALWAIT:
991		callout_stop(&fdc->sc_timo_ch);
992		fdc->sc_state = RECALCOMPLETE;
993		/* allow 1/30 second for heads to settle */
994		callout_reset(&fdc->sc_intr_ch, hz / 30, fdcpseudointr, fdc);
995		return 1;			/* will return later */
996
997	case RECALCOMPLETE:
998		out_fdc(iot, ioh, NE7CMD_SENSEI);
999		if (fdcresult(fdc) != 2 || (st0 & 0xf8) != 0x20 || cyl != 0) {
1000#ifdef FD_DEBUG
1001			fdcstatus(fd->sc_dev, 2, "recalibrate failed");
1002#endif
1003			fdcretry(fdc);
1004			goto loop;
1005		}
1006		fd->sc_cylin = 0;
1007		goto doseek;
1008
1009	case MOTORWAIT:
1010		if (fd->sc_flags & FD_MOTOR_WAIT)
1011			return 1;		/* time's not up yet */
1012		goto doseek;
1013
1014	default:
1015		fdcstatus(fd->sc_dev, 0, "stray interrupt");
1016		return 1;
1017	}
1018#ifdef DIAGNOSTIC
1019	panic("%s: impossible", __func__);
1020#endif
1021#undef	st0
1022#undef	cyl
1023}
1024
1025void
1026fdcretry(struct fdc_softc *fdc)
1027{
1028	struct fd_softc *fd;
1029	struct buf *bp;
1030
1031	fd = TAILQ_FIRST(&fdc->sc_drives);
1032	bp = bufq_peek(fd->sc_q);
1033
1034	switch (fdc->sc_errors) {
1035	case 0:
1036		/* try again */
1037		fdc->sc_state = DOSEEK;
1038		break;
1039
1040	case 1:
1041	case 2:
1042	case 3:
1043		/* didn't work; try recalibrating */
1044		fdc->sc_state = DORECAL;
1045		break;
1046
1047	case 4:
1048		/* still no go; reset the bastard */
1049		fdc->sc_state = DORESET;
1050		break;
1051
1052	default:
1053		diskerr(bp, "fd", "hard error", LOG_PRINTF,
1054		    fd->sc_skip / FDC_BSIZE, (struct disklabel *)NULL);
1055
1056		fdcpstatus(7, fdc);
1057		bp->b_error = EIO;
1058		fdfinish(fd, bp);
1059	}
1060	fdc->sc_errors++;
1061}
1062
1063int
1064fdioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
1065{
1066	struct fd_softc *fd = device_lookup_private(&fd_cd, FDUNIT(dev));
1067	struct disklabel buffer;
1068	int error;
1069
1070	switch (cmd) {
1071	case DIOCGDINFO:
1072		memset(&buffer, 0, sizeof(buffer));
1073
1074		buffer.d_secpercyl = fd->sc_type->seccyl;
1075		buffer.d_type = DTYPE_FLOPPY;
1076		buffer.d_secsize = FDC_BSIZE;
1077
1078		if (readdisklabel(dev, fdstrategy, &buffer, NULL) != NULL)
1079			return EINVAL;
1080
1081		*(struct disklabel *)addr = buffer;
1082		return 0;
1083
1084	case DIOCWLABEL:
1085		if ((flag & FWRITE) == 0)
1086			return EBADF;
1087		/* XXX do something */
1088		return 0;
1089
1090	case DIOCWDINFO:
1091		if ((flag & FWRITE) == 0)
1092			return EBADF;
1093
1094		error = setdisklabel(&buffer, (struct disklabel *)addr,
1095		    0, NULL);
1096		if (error)
1097			return error;
1098
1099		error = writedisklabel(dev, fdstrategy, &buffer, NULL);
1100		return error;
1101
1102	default:
1103		return ENOTTY;
1104	}
1105
1106#ifdef DIAGNOSTIC
1107	panic("%s: impossible", __func__);
1108#endif
1109}
1110
1111/*
1112 * Mountroot hook: prompt the user to enter the root file system floppy.
1113 */
1114void
1115fd_mountroot_hook(device_t dev)
1116{
1117	int c;
1118
1119	printf("Insert filesystem floppy and press return.");
1120	cnpollc(1);
1121	for (;;) {
1122		c = cngetc();
1123		if ((c == '\r') || (c == '\n')) {
1124			printf("\n");
1125			break;
1126		}
1127	}
1128	cnpollc(0);
1129}
1130