fdc.c revision 30574 
1/*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Don Ahn.
7 *
8 * Copyright (c) 1993, 1994 by
9 *  jc@irbs.UUCP (John Capo)
10 *  vak@zebub.msk.su (Serge Vakulenko)
11 *  ache@astral.msk.su (Andrew A. Chernov)
12 *
13 * Copyright (c) 1993, 1994, 1995 by
14 *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
15 *  dufault@hda.com (Peter Dufault)
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 *    notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 *    notice, this list of conditions and the following disclaimer in the
24 *    documentation and/or other materials provided with the distribution.
25 * 3. All advertising materials mentioning features or use of this software
26 *    must display the following acknowledgement:
27 *	This product includes software developed by the University of
28 *	California, Berkeley and its contributors.
29 * 4. Neither the name of the University nor the names of its contributors
30 *    may be used to endorse or promote products derived from this software
31 *    without specific prior written permission.
32 *
33 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * SUCH DAMAGE.
44 *
45 *	from:	@(#)fd.c	7.4 (Berkeley) 5/25/91
46 *	$Id: fd.c,v 1.104 1997/09/23 22:14:43 gibbs Exp $
47 *
48 */
49
50#include "ft.h"
51#if NFT < 1
52#undef NFDC
53#endif
54#include "fd.h"
55#include "opt_fdc.h"
56
57#if NFDC > 0
58
59#include <sys/param.h>
60#include <sys/systm.h>
61#include <sys/kernel.h>
62#include <sys/conf.h>
63#include <sys/fcntl.h>
64#include <machine/clock.h>
65#include <machine/ioctl_fd.h>
66#include <sys/disklabel.h>
67#include <sys/buf.h>
68#include <sys/malloc.h>
69#include <sys/proc.h>
70#include <sys/syslog.h>
71#ifdef notyet
72#include <sys/dkstat.h>
73#endif
74#include <i386/isa/isa.h>
75#include <i386/isa/isa_device.h>
76#include <i386/isa/fdreg.h>
77#include <i386/isa/fdc.h>
78#include <i386/isa/rtc.h>
79#include <machine/stdarg.h>
80#if NFT > 0
81#include <sys/ftape.h>
82#include <i386/isa/ftreg.h>
83#endif
84#ifdef DEVFS
85#include <sys/devfsext.h>
86#endif
87
88/* misuse a flag to identify format operation */
89#define B_FORMAT B_XXX
90
91/* configuration flags */
92#define FDC_PRETEND_D0	(1 << 0)	/* pretend drive 0 to be there */
93
94/* internally used only, not really from CMOS: */
95#define RTCFDT_144M_PRETENDED	0x1000
96
97/*
98 * this biotab field doubles as a field for the physical unit number
99 * on the controller
100 */
101#define id_physid id_scsiid
102
103/* error returns for fd_cmd() */
104#define FD_FAILED -1
105#define FD_NOT_VALID -2
106#define FDC_ERRMAX	100	/* do not log more */
107
108#define NUMTYPES 14
109#define NUMDENS  (NUMTYPES - 6)
110
111/* These defines (-1) must match index for fd_types */
112#define F_TAPE_TYPE	0x020	/* bit for fd_types to indicate tape */
113#define NO_TYPE		0	/* must match NO_TYPE in ft.c */
114#define FD_1720         1
115#define FD_1480         2
116#define FD_1440         3
117#define FD_1200         4
118#define FD_820          5
119#define FD_800          6
120#define FD_720          7
121#define FD_360          8
122
123#define FD_1480in5_25   9
124#define FD_1440in5_25   10
125#define FD_820in5_25    11
126#define FD_800in5_25    12
127#define FD_720in5_25    13
128#define FD_360in5_25    14
129
130
131static struct fd_type fd_types[NUMTYPES] =
132{
133{ 21,2,0xFF,0x04,82,3444,1,FDC_500KBPS,2,0x0C,2 }, /* 1.72M in HD 3.5in */
134{ 18,2,0xFF,0x1B,82,2952,1,FDC_500KBPS,2,0x6C,1 }, /* 1.48M in HD 3.5in */
135{ 18,2,0xFF,0x1B,80,2880,1,FDC_500KBPS,2,0x6C,1 }, /* 1.44M in HD 3.5in */
136{ 15,2,0xFF,0x1B,80,2400,1,FDC_500KBPS,2,0x54,1 }, /*  1.2M in HD 5.25/3.5 */
137{ 10,2,0xFF,0x10,82,1640,1,FDC_250KBPS,2,0x2E,1 }, /*  820K in HD 3.5in */
138{ 10,2,0xFF,0x10,80,1600,1,FDC_250KBPS,2,0x2E,1 }, /*  800K in HD 3.5in */
139{  9,2,0xFF,0x20,80,1440,1,FDC_250KBPS,2,0x50,1 }, /*  720K in HD 3.5in */
140{  9,2,0xFF,0x2A,40, 720,1,FDC_250KBPS,2,0x50,1 }, /*  360K in DD 5.25in */
141
142{ 18,2,0xFF,0x02,82,2952,1,FDC_500KBPS,2,0x02,2 }, /* 1.48M in HD 5.25in */
143{ 18,2,0xFF,0x02,80,2880,1,FDC_500KBPS,2,0x02,2 }, /* 1.44M in HD 5.25in */
144{ 10,2,0xFF,0x10,82,1640,1,FDC_300KBPS,2,0x2E,1 }, /*  820K in HD 5.25in */
145{ 10,2,0xFF,0x10,80,1600,1,FDC_300KBPS,2,0x2E,1 }, /*  800K in HD 5.25in */
146{  9,2,0xFF,0x20,80,1440,1,FDC_300KBPS,2,0x50,1 }, /*  720K in HD 5.25in */
147{  9,2,0xFF,0x23,40, 720,2,FDC_300KBPS,2,0x50,1 }, /*  360K in HD 5.25in */
148};
149
150#define DRVS_PER_CTLR 2		/* 2 floppies */
151
152/***********************************************************************\
153* Per controller structure.						*
154\***********************************************************************/
155struct fdc_data fdc_data[NFDC];
156
157/***********************************************************************\
158* Per drive structure.							*
159* N per controller  (DRVS_PER_CTLR)					*
160\***********************************************************************/
161static struct fd_data {
162	struct	fdc_data *fdc;	/* pointer to controller structure */
163	int	fdsu;		/* this units number on this controller */
164	int	type;		/* Drive type (FD_1440...) */
165	struct	fd_type *ft;	/* pointer to the type descriptor */
166	int	flags;
167#define	FD_OPEN		0x01	/* it's open		*/
168#define	FD_ACTIVE	0x02	/* it's active		*/
169#define	FD_MOTOR	0x04	/* motor should be on	*/
170#define	FD_MOTOR_WAIT	0x08	/* motor coming up	*/
171	int	skip;
172	int	hddrv;
173#define FD_NO_TRACK -2
174	int	track;		/* where we think the head is */
175	int	options;	/* user configurable options, see ioctl_fd.h */
176#ifdef notyet
177	int	dkunit;		/* disk stats unit number */
178#endif
179	struct	callout_handle toffhandle;
180	struct	callout_handle tohandle;
181#ifdef DEVFS
182	void	*bdevs[1 + NUMDENS + MAXPARTITIONS];
183	void	*cdevs[1 + NUMDENS + MAXPARTITIONS];
184#endif
185} fd_data[NFD];
186
187/***********************************************************************\
188* Throughout this file the following conventions will be used:		*
189* fd is a pointer to the fd_data struct for the drive in question	*
190* fdc is a pointer to the fdc_data struct for the controller		*
191* fdu is the floppy drive unit number					*
192* fdcu is the floppy controller unit number				*
193* fdsu is the floppy drive unit number on that controller. (sub-unit)	*
194\***********************************************************************/
195
196#if NFT > 0
197int ftopen(dev_t, int);
198int ftintr(ftu_t ftu);
199int ftclose(dev_t, int);
200void ftstrategy(struct buf *);
201int ftioctl(dev_t, int, caddr_t, int, struct proc *);
202int ftdump(dev_t);
203int ftsize(dev_t);
204int ftattach(struct isa_device *, struct isa_device *, int);
205#endif
206
207/* autoconfig functions */
208static int fdprobe(struct isa_device *);
209static int fdattach(struct isa_device *);
210
211/* needed for ft driver, thus exported */
212int in_fdc(fdcu_t);
213int out_fdc(fdcu_t, int);
214
215/* internal functions */
216static void set_motor(fdcu_t, int, int);
217#  define TURNON 1
218#  define TURNOFF 0
219static timeout_t fd_turnoff;
220static timeout_t fd_motor_on;
221static void fd_turnon(fdu_t);
222static void fdc_reset(fdc_p);
223static int fd_in(fdcu_t, int *);
224static void fdstart(fdcu_t);
225static timeout_t fd_timeout;
226static timeout_t fd_pseudointr;
227static int fdstate(fdcu_t, fdc_p);
228static int retrier(fdcu_t);
229static int fdformat(dev_t, struct fd_formb *, struct proc *);
230
231static int enable_fifo(fdc_p fdc);
232
233static int fifo_threshold = 8;	/* XXX: should be accessible via sysctl */
234
235
236#define DEVIDLE		0
237#define FINDWORK	1
238#define	DOSEEK		2
239#define SEEKCOMPLETE 	3
240#define	IOCOMPLETE	4
241#define RECALCOMPLETE	5
242#define	STARTRECAL	6
243#define	RESETCTLR	7
244#define	SEEKWAIT	8
245#define	RECALWAIT	9
246#define	MOTORWAIT	10
247#define	IOTIMEDOUT	11
248
249#ifdef	FDC_DEBUG
250static char const * const fdstates[] =
251{
252"DEVIDLE",
253"FINDWORK",
254"DOSEEK",
255"SEEKCOMPLETE",
256"IOCOMPLETE",
257"RECALCOMPLETE",
258"STARTRECAL",
259"RESETCTLR",
260"SEEKWAIT",
261"RECALWAIT",
262"MOTORWAIT",
263"IOTIMEDOUT"
264};
265
266/* CAUTION: fd_debug causes huge amounts of logging output */
267static int volatile fd_debug = 0;
268#define TRACE0(arg) if(fd_debug) printf(arg)
269#define TRACE1(arg1, arg2) if(fd_debug) printf(arg1, arg2)
270#else /* FDC_DEBUG */
271#define TRACE0(arg)
272#define TRACE1(arg1, arg2)
273#endif /* FDC_DEBUG */
274
275/* autoconfig structure */
276
277struct	isa_driver fdcdriver = {
278	fdprobe, fdattach, "fdc",
279};
280
281static	d_open_t	Fdopen;	/* NOTE, not fdopen */
282static	d_close_t	fdclose;
283static	d_ioctl_t	fdioctl;
284static	d_strategy_t	fdstrategy;
285
286#define CDEV_MAJOR 9
287#define BDEV_MAJOR 2
288static struct cdevsw fd_cdevsw;
289static struct bdevsw fd_bdevsw =
290	{ Fdopen,	fdclose,	fdstrategy,	fdioctl,	/*2*/
291	  nodump,	nopsize,	D_DISK,	"fd",	&fd_cdevsw,	-1 };
292
293
294static struct isa_device *fdcdevs[NFDC];
295
296static int
297fdc_err(fdcu_t fdcu, const char *s)
298{
299	fdc_data[fdcu].fdc_errs++;
300	if(s) {
301		if(fdc_data[fdcu].fdc_errs < FDC_ERRMAX)
302			printf("fdc%d: %s", fdcu, s);
303		else if(fdc_data[fdcu].fdc_errs == FDC_ERRMAX)
304			printf("fdc%d: too many errors, not logging any more\n",
305			       fdcu);
306	}
307
308	return FD_FAILED;
309}
310
311/*
312 * fd_cmd: Send a command to the chip.  Takes a varargs with this structure:
313 * Unit number,
314 * # of output bytes, output bytes as ints ...,
315 * # of input bytes, input bytes as ints ...
316 */
317
318static int
319fd_cmd(fdcu_t fdcu, int n_out, ...)
320{
321	u_char cmd;
322	int n_in;
323	int n;
324	va_list ap;
325
326	va_start(ap, n_out);
327	cmd = (u_char)(va_arg(ap, int));
328	va_end(ap);
329	va_start(ap, n_out);
330	for (n = 0; n < n_out; n++)
331	{
332		if (out_fdc(fdcu, va_arg(ap, int)) < 0)
333		{
334			char msg[50];
335			sprintf(msg,
336				"cmd %x failed at out byte %d of %d\n",
337				cmd, n + 1, n_out);
338			return fdc_err(fdcu, msg);
339		}
340	}
341	n_in = va_arg(ap, int);
342	for (n = 0; n < n_in; n++)
343	{
344		int *ptr = va_arg(ap, int *);
345		if (fd_in(fdcu, ptr) < 0)
346		{
347			char msg[50];
348			sprintf(msg,
349				"cmd %02x failed at in byte %d of %d\n",
350				cmd, n + 1, n_in);
351			return fdc_err(fdcu, msg);
352		}
353	}
354
355	return 0;
356}
357
358static int
359enable_fifo(fdc_p fdc)
360{
361	int i, j;
362
363	if ((fdc->flags & FDC_HAS_FIFO) == 0) {
364
365		/*
366		 * XXX:
367		 * Cannot use fd_cmd the normal way here, since
368		 * this might be an invalid command. Thus we send the
369		 * first byte, and check for an early turn of data directon.
370		 */
371
372		if (out_fdc(fdc->fdcu, I8207X_CONFIGURE) < 0)
373			return fdc_err(fdc->fdcu, "Enable FIFO failed\n");
374
375		/* If command is invalid, return */
376		j = 100000;
377		while ((i = inb(fdc->baseport + FDSTS) & (NE7_DIO | NE7_RQM))
378		       != NE7_RQM && j-- > 0)
379			if (i == (NE7_DIO | NE7_RQM)) {
380				fdc_reset(fdc);
381				return FD_FAILED;
382			}
383		if (j<0 ||
384		    fd_cmd(fdc->fdcu, 3,
385			   0, (fifo_threshold - 1) & 0xf, 0, 0) < 0) {
386			fdc_reset(fdc);
387			return fdc_err(fdc->fdcu, "Enable FIFO failed\n");
388		}
389		fdc->flags |= FDC_HAS_FIFO;
390		return 0;
391	}
392	if (fd_cmd(fdc->fdcu, 4,
393		   I8207X_CONFIGURE, 0, (fifo_threshold - 1) & 0xf, 0, 0) < 0)
394		return fdc_err(fdc->fdcu, "Re-enable FIFO failed\n");
395	return 0;
396}
397
398static int
399fd_sense_drive_status(fdc_p fdc, int *st3p)
400{
401	int st3;
402
403	if (fd_cmd(fdc->fdcu, 2, NE7CMD_SENSED, fdc->fdu, 1, &st3))
404	{
405		return fdc_err(fdc->fdcu, "Sense Drive Status failed\n");
406	}
407	if (st3p)
408		*st3p = st3;
409
410	return 0;
411}
412
413static int
414fd_sense_int(fdc_p fdc, int *st0p, int *cylp)
415{
416	int st0, cyl;
417
418	int ret = fd_cmd(fdc->fdcu, 1, NE7CMD_SENSEI, 1, &st0);
419
420	if (ret)
421	{
422		(void)fdc_err(fdc->fdcu,
423			      "sense intr err reading stat reg 0\n");
424		return ret;
425	}
426
427	if (st0p)
428		*st0p = st0;
429
430	if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV)
431	{
432		/*
433		 * There doesn't seem to have been an interrupt.
434		 */
435		return FD_NOT_VALID;
436	}
437
438	if (fd_in(fdc->fdcu, &cyl) < 0)
439	{
440		return fdc_err(fdc->fdcu, "can't get cyl num\n");
441	}
442
443	if (cylp)
444		*cylp = cyl;
445
446	return 0;
447}
448
449
450static int
451fd_read_status(fdc_p fdc, int fdsu)
452{
453	int i, ret;
454
455	for (i = 0; i < 7; i++)
456	{
457		/*
458		 * XXX types are poorly chosen.  Only bytes can by read
459		 * from the hardware, but fdc_status wants u_longs and
460		 * fd_in() gives ints.
461		 */
462		int status;
463
464		ret = fd_in(fdc->fdcu, &status);
465		fdc->status[i] = status;
466		if (ret != 0)
467			break;
468	}
469
470	if (ret == 0)
471		fdc->flags |= FDC_STAT_VALID;
472	else
473		fdc->flags &= ~FDC_STAT_VALID;
474
475	return ret;
476}
477
478/****************************************************************************/
479/*                      autoconfiguration stuff                             */
480/****************************************************************************/
481
482/*
483 * probe for existance of controller
484 */
485static int
486fdprobe(struct isa_device *dev)
487{
488	fdcu_t	fdcu = dev->id_unit;
489	if(fdc_data[fdcu].flags & FDC_ATTACHED)
490	{
491		printf("fdc%d: unit used multiple times\n", fdcu);
492		return 0;
493	}
494
495	fdcdevs[fdcu] = dev;
496	fdc_data[fdcu].baseport = dev->id_iobase;
497
498	/* First - lets reset the floppy controller */
499	outb(dev->id_iobase+FDOUT, 0);
500	DELAY(100);
501	outb(dev->id_iobase+FDOUT, FDO_FRST);
502
503	/* see if it can handle a command */
504	if (fd_cmd(fdcu,
505		   3, NE7CMD_SPECIFY, NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
506		   0))
507	{
508		return(0);
509	}
510	return (IO_FDCSIZE);
511}
512
513/*
514 * wire controller into system, look for floppy units
515 */
516static int
517fdattach(struct isa_device *dev)
518{
519	unsigned fdt;
520	fdu_t	fdu;
521	fdcu_t	fdcu = dev->id_unit;
522	fdc_p	fdc = fdc_data + fdcu;
523	fd_p	fd;
524	int	fdsu, st0, st3, i;
525#if NFT > 0
526	int	unithasfd;
527#endif
528	struct isa_device *fdup;
529	int ic_type = 0;
530#ifdef DEVFS
531	int	mynor;
532	int	typemynor;
533	int	typesize;
534#endif
535
536	fdc->fdcu = fdcu;
537	fdc->flags |= FDC_ATTACHED;
538	fdc->dmachan = dev->id_drq;
539	/* Acquire the DMA channel forever, The driver will do the rest */
540	isa_dma_acquire(fdc->dmachan);
541	isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */);
542	fdc->state = DEVIDLE;
543	/* reset controller, turn motor off, clear fdout mirror reg */
544	outb(fdc->baseport + FDOUT, ((fdc->fdout = 0)));
545	bufq_init(&fdc->head);
546
547	/* check for each floppy drive */
548	for (fdup = isa_biotab_fdc; fdup->id_driver != 0; fdup++) {
549		if (fdup->id_iobase != dev->id_iobase)
550			continue;
551		fdu = fdup->id_unit;
552		fd = &fd_data[fdu];
553		if (fdu >= (NFD+NFT))
554			continue;
555		fdsu = fdup->id_physid;
556		/* look up what bios thinks we have */
557		switch (fdu) {
558			case 0: if (dev->id_flags & FDC_PRETEND_D0)
559					fdt = RTCFDT_144M | RTCFDT_144M_PRETENDED;
560				else
561					fdt = (rtcin(RTC_FDISKETTE) & 0xf0);
562				break;
563			case 1: fdt = ((rtcin(RTC_FDISKETTE) << 4) & 0xf0);
564				break;
565			default: fdt = RTCFDT_NONE;
566				break;
567		}
568		/* is there a unit? */
569		if ((fdt == RTCFDT_NONE)
570#if NFT > 0
571		    || (fdsu >= DRVS_PER_CTLR)) {
572#else
573		) {
574			fd->type = NO_TYPE;
575#endif
576#if NFT > 0
577			/* If BIOS says no floppy, or > 2nd device */
578			/* Probe for and attach a floppy tape.     */
579			/* Tell FT if there was already a disk     */
580			/* with this unit number found.            */
581
582			unithasfd = 0;
583			if (fdu < NFD && fd->type != NO_TYPE)
584				unithasfd = 1;
585			if (ftattach(dev, fdup, unithasfd))
586				continue;
587			if (fdsu < DRVS_PER_CTLR)
588				fd->type = NO_TYPE;
589#endif
590			continue;
591		}
592
593		/* select it */
594		set_motor(fdcu, fdsu, TURNON);
595		DELAY(1000000);	/* 1 sec */
596
597		if (ic_type == 0 &&
598		    fd_cmd(fdcu, 1, NE7CMD_VERSION, 1, &ic_type) == 0)
599		{
600#ifdef FDC_PRINT_BOGUS_CHIPTYPE
601			printf("fdc%d: ", fdcu);
602#endif
603			ic_type = (u_char)ic_type;
604			switch( ic_type ) {
605			case 0x80:
606#ifdef FDC_PRINT_BOGUS_CHIPTYPE
607				printf("NEC 765\n");
608#endif
609				fdc->fdct = FDC_NE765;
610				break;
611			case 0x81:
612#ifdef FDC_PRINT_BOGUS_CHIPTYPE
613				printf("Intel 82077\n");
614#endif
615				fdc->fdct = FDC_I82077;
616				break;
617			case 0x90:
618#ifdef FDC_PRINT_BOGUS_CHIPTYPE
619				printf("NEC 72065B\n");
620#endif
621				fdc->fdct = FDC_NE72065;
622				break;
623			default:
624#ifdef FDC_PRINT_BOGUS_CHIPTYPE
625				printf("unknown IC type %02x\n", ic_type);
626#endif
627				fdc->fdct = FDC_UNKNOWN;
628				break;
629			}
630			if (fdc->fdct != FDC_NE765 &&
631			    fdc->fdct != FDC_UNKNOWN &&
632			    enable_fifo(fdc) == 0) {
633				printf("fdc%d: FIFO enabled", fdcu);
634				printf(", %d bytes threshold\n",
635				       fifo_threshold);
636			}
637		}
638		if ((fd_cmd(fdcu, 2, NE7CMD_SENSED, fdsu, 1, &st3) == 0) &&
639		    (st3 & NE7_ST3_T0)) {
640			/* if at track 0, first seek inwards */
641			/* seek some steps: */
642			(void)fd_cmd(fdcu, 3, NE7CMD_SEEK, fdsu, 10, 0);
643			DELAY(300000); /* ...wait a moment... */
644			(void)fd_sense_int(fdc, 0, 0); /* make ctrlr happy */
645		}
646
647		/* If we're at track 0 first seek inwards. */
648		if ((fd_sense_drive_status(fdc, &st3) == 0) &&
649		    (st3 & NE7_ST3_T0)) {
650			/* Seek some steps... */
651			if (fd_cmd(fdcu, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
652				/* ...wait a moment... */
653				DELAY(300000);
654				/* make ctrlr happy: */
655				(void)fd_sense_int(fdc, 0, 0);
656			}
657		}
658
659		for(i = 0; i < 2; i++) {
660			/*
661			 * we must recalibrate twice, just in case the
662			 * heads have been beyond cylinder 76, since most
663			 * FDCs still barf when attempting to recalibrate
664			 * more than 77 steps
665			 */
666			/* go back to 0: */
667			if (fd_cmd(fdcu, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
668				/* a second being enough for full stroke seek*/
669				DELAY(i == 0? 1000000: 300000);
670
671				/* anything responding? */
672				if (fd_sense_int(fdc, &st0, 0) == 0 &&
673				(st0 & NE7_ST0_EC) == 0)
674					break; /* already probed succesfully */
675			}
676		}
677
678		set_motor(fdcu, fdsu, TURNOFF);
679
680		if (st0 & NE7_ST0_EC) /* no track 0 -> no drive present */
681			continue;
682
683		fd->track = FD_NO_TRACK;
684		fd->fdc = fdc;
685		fd->fdsu = fdsu;
686		fd->options = 0;
687		callout_handle_init(&fd->toffhandle);
688		callout_handle_init(&fd->tohandle);
689		printf("fd%d: ", fdu);
690
691		switch (fdt) {
692		case RTCFDT_12M:
693			printf("1.2MB 5.25in\n");
694			fd->type = FD_1200;
695			break;
696		case RTCFDT_144M | RTCFDT_144M_PRETENDED:
697			printf("config-pretended ");
698			fdt = RTCFDT_144M;
699			/* fallthrough */
700		case RTCFDT_144M:
701			printf("1.44MB 3.5in\n");
702			fd->type = FD_1440;
703			break;
704		case RTCFDT_288M:
705		case RTCFDT_288M_1:
706			printf("2.88MB 3.5in - 1.44MB mode\n");
707			fd->type = FD_1440;
708			break;
709		case RTCFDT_360K:
710			printf("360KB 5.25in\n");
711			fd->type = FD_360;
712			break;
713		case RTCFDT_720K:
714			printf("720KB 3.5in\n");
715			fd->type = FD_720;
716			break;
717		default:
718			printf("unknown\n");
719			fd->type = NO_TYPE;
720			continue;
721		}
722#ifdef DEVFS
723		mynor = fdu << 6;
724		fd->bdevs[0] = devfs_add_devswf(&fd_bdevsw, mynor, DV_BLK,
725						UID_ROOT, GID_OPERATOR, 0640,
726						"fd%d", fdu);
727		fd->cdevs[0] = devfs_add_devswf(&fd_cdevsw, mynor, DV_CHR,
728						UID_ROOT, GID_OPERATOR, 0640,
729						"rfd%d", fdu);
730		for (i = 1; i < 1 + NUMDENS; i++) {
731			/*
732			 * XXX this and the lookup in Fdopen() should be
733			 * data driven.
734			 */
735			switch (fd->type) {
736			case FD_360:
737				if (i != FD_360)
738					continue;
739				break;
740			case FD_720:
741				if (i != FD_720 && i != FD_800 && i != FD_820)
742					continue;
743				break;
744			case FD_1200:
745				if (i != FD_360 && i != FD_720 && i != FD_800
746				    && i != FD_820 && i != FD_1200
747				    && i != FD_1440 && i != FD_1480)
748					continue;
749				break;
750			case FD_1440:
751				if (i != FD_720 && i != FD_800 && i != FD_820
752				    && i != FD_1200 && i != FD_1440
753				    && i != FD_1480 && i != FD_1720)
754					continue;
755				break;
756			}
757			typemynor = mynor | i;
758			typesize = fd_types[i - 1].size / 2;
759			/*
760			 * XXX all these conversions give bloated code and
761			 * confusing names.
762			 */
763			if (typesize == 1476)
764				typesize = 1480;
765			if (typesize == 1722)
766				typesize = 1720;
767			fd->bdevs[i] =
768				devfs_add_devswf(&fd_bdevsw, typemynor, DV_BLK,
769						 UID_ROOT, GID_OPERATOR, 0640,
770						 "fd%d.%d", fdu, typesize);
771			fd->cdevs[i] =
772				devfs_add_devswf(&fd_cdevsw, typemynor, DV_CHR,
773						 UID_ROOT, GID_OPERATOR, 0640,
774						 "rfd%d.%d", fdu, typesize);
775		}
776		for (i = 0; i < MAXPARTITIONS; i++) {
777			fd->bdevs[1 + NUMDENS + i] =
778				devfs_link(fd->bdevs[0],
779					   "fd%d%c", fdu, 'a' + i);
780			fd->cdevs[1 + NUMDENS + i] =
781				devfs_link(fd->cdevs[0],
782					   "rfd%d%c", fdu, 'a' + i);
783		}
784#endif /* DEVFS */
785#ifdef notyet
786		if (dk_ndrive < DK_NDRIVE) {
787			sprintf(dk_names[dk_ndrive], "fd%d", fdu);
788			fd->dkunit = dk_ndrive++;
789			/*
790			 * XXX assume rate is FDC_500KBPS.
791			 */
792			dk_wpms[dk_ndrive] = 500000 / 8 / 2;
793		} else {
794			fd->dkunit = -1;
795		}
796#endif
797	}
798
799	return (1);
800}
801
802/****************************************************************************/
803/*                            motor control stuff                           */
804/*		remember to not deselect the drive we're working on         */
805/****************************************************************************/
806static void
807set_motor(fdcu_t fdcu, int fdsu, int turnon)
808{
809	int fdout = fdc_data[fdcu].fdout;
810	int needspecify = 0;
811
812	if(turnon) {
813		fdout &= ~FDO_FDSEL;
814		fdout |= (FDO_MOEN0 << fdsu) + fdsu;
815	} else
816		fdout &= ~(FDO_MOEN0 << fdsu);
817
818	if(!turnon
819	   && (fdout & (FDO_MOEN0+FDO_MOEN1+FDO_MOEN2+FDO_MOEN3)) == 0)
820		/* gonna turn off the last drive, put FDC to bed */
821		fdout &= ~ (FDO_FRST|FDO_FDMAEN);
822	else {
823		/* make sure controller is selected and specified */
824		if((fdout & (FDO_FRST|FDO_FDMAEN)) == 0)
825			needspecify = 1;
826		fdout |= (FDO_FRST|FDO_FDMAEN);
827	}
828
829	outb(fdc_data[fdcu].baseport+FDOUT, fdout);
830	fdc_data[fdcu].fdout = fdout;
831	TRACE1("[0x%x->FDOUT]", fdout);
832
833	if(needspecify) {
834		/*
835		 * XXX
836		 * special case: since we have just woken up the FDC
837		 * from its sleep, we silently assume the command will
838		 * be accepted, and do not test for a timeout
839		 */
840		(void)fd_cmd(fdcu, 3, NE7CMD_SPECIFY,
841			     NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
842			     0);
843		if (fdc_data[fdcu].flags & FDC_HAS_FIFO)
844			(void) enable_fifo(&fdc_data[fdcu]);
845	}
846}
847
848static void
849fd_turnoff(void *arg1)
850{
851	fdu_t fdu = (fdu_t)arg1;
852	int	s;
853	fd_p fd = fd_data + fdu;
854
855	TRACE1("[fd%d: turnoff]", fdu);
856
857	/*
858	 * Don't turn off the motor yet if the drive is active.
859	 * XXX shouldn't even schedule turnoff until drive is inactive
860	 * and nothing is queued on it.
861	 */
862	if (fd->fdc->state != DEVIDLE && fd->fdc->fdu == fdu) {
863		fd->toffhandle = timeout(fd_turnoff, arg1, 4 * hz);
864		return;
865	}
866
867	s = splbio();
868	fd->flags &= ~FD_MOTOR;
869	set_motor(fd->fdc->fdcu, fd->fdsu, TURNOFF);
870	splx(s);
871}
872
873static void
874fd_motor_on(void *arg1)
875{
876	fdu_t fdu = (fdu_t)arg1;
877	int	s;
878
879	fd_p fd = fd_data + fdu;
880	s = splbio();
881	fd->flags &= ~FD_MOTOR_WAIT;
882	if((fd->fdc->fd == fd) && (fd->fdc->state == MOTORWAIT))
883	{
884		fdintr(fd->fdc->fdcu);
885	}
886	splx(s);
887}
888
889static void
890fd_turnon(fdu_t fdu)
891{
892	fd_p fd = fd_data + fdu;
893	if(!(fd->flags & FD_MOTOR))
894	{
895		fd->flags |= (FD_MOTOR + FD_MOTOR_WAIT);
896		set_motor(fd->fdc->fdcu, fd->fdsu, TURNON);
897		timeout(fd_motor_on, (caddr_t)fdu, hz); /* in 1 sec its ok */
898	}
899}
900
901static void
902fdc_reset(fdc_p fdc)
903{
904	fdcu_t fdcu = fdc->fdcu;
905
906	/* Try a reset, keep motor on */
907	outb(fdc->baseport + FDOUT, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
908	TRACE1("[0x%x->FDOUT]", fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
909	DELAY(100);
910	/* enable FDC, but defer interrupts a moment */
911	outb(fdc->baseport + FDOUT, fdc->fdout & ~FDO_FDMAEN);
912	TRACE1("[0x%x->FDOUT]", fdc->fdout & ~FDO_FDMAEN);
913	DELAY(100);
914	outb(fdc->baseport + FDOUT, fdc->fdout);
915	TRACE1("[0x%x->FDOUT]", fdc->fdout);
916
917	/* XXX after a reset, silently believe the FDC will accept commands */
918	(void)fd_cmd(fdcu, 3, NE7CMD_SPECIFY,
919		     NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
920		     0);
921	if (fdc->flags & FDC_HAS_FIFO)
922		(void) enable_fifo(fdc);
923}
924
925/****************************************************************************/
926/*                             fdc in/out                                   */
927/****************************************************************************/
928int
929in_fdc(fdcu_t fdcu)
930{
931	int baseport = fdc_data[fdcu].baseport;
932	int i, j = 100000;
933	while ((i = inb(baseport+FDSTS) & (NE7_DIO|NE7_RQM))
934		!= (NE7_DIO|NE7_RQM) && j-- > 0)
935		if (i == NE7_RQM)
936			return fdc_err(fdcu, "ready for output in input\n");
937	if (j <= 0)
938		return fdc_err(fdcu, bootverbose? "input ready timeout\n": 0);
939#ifdef	FDC_DEBUG
940	i = inb(baseport+FDDATA);
941	TRACE1("[FDDATA->0x%x]", (unsigned char)i);
942	return(i);
943#else	/* !FDC_DEBUG */
944	return inb(baseport+FDDATA);
945#endif	/* FDC_DEBUG */
946}
947
948/*
949 * fd_in: Like in_fdc, but allows you to see if it worked.
950 */
951static int
952fd_in(fdcu_t fdcu, int *ptr)
953{
954	int baseport = fdc_data[fdcu].baseport;
955	int i, j = 100000;
956	while ((i = inb(baseport+FDSTS) & (NE7_DIO|NE7_RQM))
957		!= (NE7_DIO|NE7_RQM) && j-- > 0)
958		if (i == NE7_RQM)
959			return fdc_err(fdcu, "ready for output in input\n");
960	if (j <= 0)
961		return fdc_err(fdcu, bootverbose? "input ready timeout\n": 0);
962#ifdef	FDC_DEBUG
963	i = inb(baseport+FDDATA);
964	TRACE1("[FDDATA->0x%x]", (unsigned char)i);
965	*ptr = i;
966	return 0;
967#else	/* !FDC_DEBUG */
968	i = inb(baseport+FDDATA);
969	if (ptr)
970		*ptr = i;
971	return 0;
972#endif	/* FDC_DEBUG */
973}
974
975int
976out_fdc(fdcu_t fdcu, int x)
977{
978	int baseport = fdc_data[fdcu].baseport;
979	int i;
980
981	/* Check that the direction bit is set */
982	i = 100000;
983	while ((inb(baseport+FDSTS) & NE7_DIO) && i-- > 0);
984	if (i <= 0) return fdc_err(fdcu, "direction bit not set\n");
985
986	/* Check that the floppy controller is ready for a command */
987	i = 100000;
988	while ((inb(baseport+FDSTS) & NE7_RQM) == 0 && i-- > 0);
989	if (i <= 0)
990		return fdc_err(fdcu, bootverbose? "output ready timeout\n": 0);
991
992	/* Send the command and return */
993	outb(baseport+FDDATA, x);
994	TRACE1("[0x%x->FDDATA]", x);
995	return (0);
996}
997
998/****************************************************************************/
999/*                           fdopen/fdclose                                 */
1000/****************************************************************************/
1001int
1002Fdopen(dev_t dev, int flags, int mode, struct proc *p)
1003{
1004 	fdu_t fdu = FDUNIT(minor(dev));
1005	int type = FDTYPE(minor(dev));
1006	fdc_p	fdc;
1007
1008#if NFT > 0
1009	/* check for a tape open */
1010	if (type & F_TAPE_TYPE)
1011		return(ftopen(dev, flags));
1012#endif
1013	/* check bounds */
1014	if (fdu >= NFD)
1015		return(ENXIO);
1016	fdc = fd_data[fdu].fdc;
1017	if ((fdc == NULL) || (fd_data[fdu].type == NO_TYPE))
1018		return(ENXIO);
1019	if (type > NUMDENS)
1020		return(ENXIO);
1021	if (type == 0)
1022		type = fd_data[fdu].type;
1023	else {
1024		if (type != fd_data[fdu].type) {
1025			switch (fd_data[fdu].type) {
1026			case FD_360:
1027				return(ENXIO);
1028			case FD_720:
1029				if (   type != FD_820
1030				    && type != FD_800
1031				   )
1032					return(ENXIO);
1033				break;
1034			case FD_1200:
1035				switch (type) {
1036				case FD_1480:
1037					type = FD_1480in5_25;
1038					break;
1039				case FD_1440:
1040					type = FD_1440in5_25;
1041					break;
1042				case FD_820:
1043					type = FD_820in5_25;
1044					break;
1045				case FD_800:
1046					type = FD_800in5_25;
1047					break;
1048				case FD_720:
1049					type = FD_720in5_25;
1050					break;
1051				case FD_360:
1052					type = FD_360in5_25;
1053					break;
1054				default:
1055					return(ENXIO);
1056				}
1057				break;
1058			case FD_1440:
1059				if (   type != FD_1720
1060				    && type != FD_1480
1061				    && type != FD_1200
1062				    && type != FD_820
1063				    && type != FD_800
1064				    && type != FD_720
1065				    )
1066					return(ENXIO);
1067				break;
1068			}
1069		}
1070	}
1071	fd_data[fdu].ft = fd_types + type - 1;
1072	fd_data[fdu].flags |= FD_OPEN;
1073
1074	return 0;
1075}
1076
1077int
1078fdclose(dev_t dev, int flags, int mode, struct proc *p)
1079{
1080 	fdu_t fdu = FDUNIT(minor(dev));
1081
1082#if NFT > 0
1083	int type = FDTYPE(minor(dev));
1084
1085	if (type & F_TAPE_TYPE)
1086		return ftclose(dev, flags);
1087#endif
1088	fd_data[fdu].flags &= ~FD_OPEN;
1089	fd_data[fdu].options &= ~FDOPT_NORETRY;
1090
1091	return(0);
1092}
1093
1094
1095/****************************************************************************/
1096/*                               fdstrategy                                 */
1097/****************************************************************************/
1098void
1099fdstrategy(struct buf *bp)
1100{
1101	unsigned nblocks, blknum, cando;
1102 	int	s;
1103 	fdcu_t	fdcu;
1104 	fdu_t	fdu;
1105 	fdc_p	fdc;
1106 	fd_p	fd;
1107	size_t	fdblk;
1108
1109 	fdu = FDUNIT(minor(bp->b_dev));
1110	fd = &fd_data[fdu];
1111	fdc = fd->fdc;
1112	fdcu = fdc->fdcu;
1113
1114#if NFT > 0
1115	if (FDTYPE(minor(bp->b_dev)) & F_TAPE_TYPE) {
1116		/* ft tapes do not (yet) support strategy i/o */
1117		bp->b_error = ENODEV;
1118		bp->b_flags |= B_ERROR;
1119		goto bad;
1120	}
1121	/* check for controller already busy with tape */
1122	if (fdc->flags & FDC_TAPE_BUSY) {
1123		bp->b_error = EBUSY;
1124		bp->b_flags |= B_ERROR;
1125		goto bad;
1126	}
1127#endif
1128	fdblk = 128 << (fd->ft->secsize);
1129	if (!(bp->b_flags & B_FORMAT)) {
1130		if ((fdu >= NFD) || (bp->b_blkno < 0)) {
1131			printf(
1132		"fd%d: fdstrat: bad request blkno = %lu, bcount = %ld\n",
1133			       fdu, (u_long)bp->b_blkno, bp->b_bcount);
1134			bp->b_error = EINVAL;
1135			bp->b_flags |= B_ERROR;
1136			goto bad;
1137		}
1138		if ((bp->b_bcount % fdblk) != 0) {
1139			bp->b_error = EINVAL;
1140			bp->b_flags |= B_ERROR;
1141			goto bad;
1142		}
1143	}
1144
1145	/*
1146	 * Set up block calculations.
1147	 */
1148	if (bp->b_blkno > 20000000) {
1149		/*
1150		 * Reject unreasonably high block number, prevent the
1151		 * multiplication below from overflowing.
1152		 */
1153		bp->b_error = EINVAL;
1154		bp->b_flags |= B_ERROR;
1155		goto bad;
1156	}
1157	blknum = (unsigned) bp->b_blkno * DEV_BSIZE/fdblk;
1158 	nblocks = fd->ft->size;
1159	bp->b_resid = 0;
1160	if (blknum + (bp->b_bcount / fdblk) > nblocks) {
1161		if (blknum <= nblocks) {
1162			cando = (nblocks - blknum) * fdblk;
1163			bp->b_resid = bp->b_bcount - cando;
1164			if (cando == 0)
1165				goto bad;	/* not actually bad but EOF */
1166		} else {
1167			bp->b_error = EINVAL;
1168			bp->b_flags |= B_ERROR;
1169			goto bad;
1170		}
1171	}
1172 	bp->b_pblkno = bp->b_blkno;
1173	s = splbio();
1174	bufqdisksort(&fdc->head, bp);
1175	untimeout(fd_turnoff, (caddr_t)fdu, fd->toffhandle); /* a good idea */
1176	fdstart(fdcu);
1177	splx(s);
1178	return;
1179
1180bad:
1181	biodone(bp);
1182}
1183
1184/***************************************************************\
1185*				fdstart				*
1186* We have just queued something.. if the controller is not busy	*
1187* then simulate the case where it has just finished a command	*
1188* So that it (the interrupt routine) looks on the queue for more*
1189* work to do and picks up what we just added.			*
1190* If the controller is already busy, we need do nothing, as it	*
1191* will pick up our work when the present work completes		*
1192\***************************************************************/
1193static void
1194fdstart(fdcu_t fdcu)
1195{
1196	int s;
1197
1198	s = splbio();
1199	if(fdc_data[fdcu].state == DEVIDLE)
1200	{
1201		fdintr(fdcu);
1202	}
1203	splx(s);
1204}
1205
1206static void
1207fd_timeout(void *arg1)
1208{
1209	fdcu_t fdcu = (fdcu_t)arg1;
1210	fdu_t fdu = fdc_data[fdcu].fdu;
1211	int baseport = fdc_data[fdcu].baseport;
1212	struct buf *bp;
1213	int s;
1214
1215	bp = bufq_first(&fdc_data[fdcu].head);
1216
1217	/*
1218	 * Due to IBM's brain-dead design, the FDC has a faked ready
1219	 * signal, hardwired to ready == true. Thus, any command
1220	 * issued if there's no diskette in the drive will _never_
1221	 * complete, and must be aborted by resetting the FDC.
1222	 * Many thanks, Big Blue!
1223	 */
1224
1225	s = splbio();
1226
1227	TRACE1("fd%d[fd_timeout()]", fdu);
1228	/* See if the controller is still busy (patiently awaiting data) */
1229	if(((inb(baseport + FDSTS)) & (NE7_CB|NE7_RQM)) == NE7_CB)
1230	{
1231		TRACE1("[FDSTS->0x%x]", inb(baseport + FDSTS));
1232		/* yup, it is; kill it now */
1233		fdc_reset(&fdc_data[fdcu]);
1234		printf("fd%d: Operation timeout\n", fdu);
1235	}
1236
1237	if (bp)
1238	{
1239		retrier(fdcu);
1240		fdc_data[fdcu].status[0] = NE7_ST0_IC_RC;
1241		fdc_data[fdcu].state = IOTIMEDOUT;
1242		if( fdc_data[fdcu].retry < 6)
1243			fdc_data[fdcu].retry = 6;
1244	}
1245	else
1246	{
1247		fdc_data[fdcu].fd = (fd_p) 0;
1248		fdc_data[fdcu].fdu = -1;
1249		fdc_data[fdcu].state = DEVIDLE;
1250	}
1251	fdintr(fdcu);
1252	splx(s);
1253}
1254
1255/* just ensure it has the right spl */
1256static void
1257fd_pseudointr(void *arg1)
1258{
1259	fdcu_t fdcu = (fdcu_t)arg1;
1260	int	s;
1261
1262	s = splbio();
1263	fdintr(fdcu);
1264	splx(s);
1265}
1266
1267/***********************************************************************\
1268*                                 fdintr				*
1269* keep calling the state machine until it returns a 0			*
1270* ALWAYS called at SPLBIO 						*
1271\***********************************************************************/
1272void
1273fdintr(fdcu_t fdcu)
1274{
1275	fdc_p fdc = fdc_data + fdcu;
1276#if NFT > 0
1277	fdu_t fdu = fdc->fdu;
1278
1279	if (fdc->flags & FDC_TAPE_BUSY)
1280		(ftintr(fdu));
1281	else
1282#endif
1283		while(fdstate(fdcu, fdc))
1284			;
1285}
1286
1287/***********************************************************************\
1288* The controller state machine.						*
1289* if it returns a non zero value, it should be called again immediatly	*
1290\***********************************************************************/
1291static int
1292fdstate(fdcu_t fdcu, fdc_p fdc)
1293{
1294	int read, format, head, sec = 0, sectrac, st0, cyl, st3;
1295	unsigned blknum = 0, b_cylinder = 0;
1296	fdu_t fdu = fdc->fdu;
1297	fd_p fd;
1298	register struct buf *bp;
1299	struct fd_formb *finfo = NULL;
1300	size_t fdblk;
1301
1302	bp = bufq_first(&fdc->head);
1303	if(!bp) {
1304		/***********************************************\
1305		* nothing left for this controller to do	*
1306		* Force into the IDLE state,			*
1307		\***********************************************/
1308		fdc->state = DEVIDLE;
1309		if(fdc->fd)
1310		{
1311			printf("fd%d: unexpected valid fd pointer\n",
1312			       fdc->fdu);
1313			fdc->fd = (fd_p) 0;
1314			fdc->fdu = -1;
1315		}
1316		TRACE1("[fdc%d IDLE]", fdcu);
1317 		return(0);
1318	}
1319	fdu = FDUNIT(minor(bp->b_dev));
1320	fd = fd_data + fdu;
1321	fdblk = 128 << fd->ft->secsize;
1322	if (fdc->fd && (fd != fdc->fd))
1323	{
1324		printf("fd%d: confused fd pointers\n", fdu);
1325	}
1326	read = bp->b_flags & B_READ;
1327	format = bp->b_flags & B_FORMAT;
1328	if(format) {
1329		finfo = (struct fd_formb *)bp->b_un.b_addr;
1330		fd->skip = (char *)&(finfo->fd_formb_cylno(0))
1331			- (char *)finfo;
1332	}
1333	if (fdc->state == DOSEEK || fdc->state == SEEKCOMPLETE) {
1334		blknum = (unsigned) bp->b_blkno * DEV_BSIZE/fdblk +
1335			fd->skip/fdblk;
1336		b_cylinder = blknum / (fd->ft->sectrac * fd->ft->heads);
1337	}
1338	TRACE1("fd%d", fdu);
1339	TRACE1("[%s]", fdstates[fdc->state]);
1340	TRACE1("(0x%x)", fd->flags);
1341	untimeout(fd_turnoff, (caddr_t)fdu, fd->toffhandle);
1342	fd->toffhandle = timeout(fd_turnoff, (caddr_t)fdu, 4 * hz);
1343	switch (fdc->state)
1344	{
1345	case DEVIDLE:
1346	case FINDWORK:	/* we have found new work */
1347		fdc->retry = 0;
1348		fd->skip = 0;
1349		fdc->fd = fd;
1350		fdc->fdu = fdu;
1351		outb(fdc->baseport+FDCTL, fd->ft->trans);
1352		TRACE1("[0x%x->FDCTL]", fd->ft->trans);
1353		/*******************************************************\
1354		* If the next drive has a motor startup pending, then	*
1355		* it will start up in it's own good time		*
1356		\*******************************************************/
1357		if(fd->flags & FD_MOTOR_WAIT)
1358		{
1359			fdc->state = MOTORWAIT;
1360			return(0); /* come back later */
1361		}
1362		/*******************************************************\
1363		* Maybe if it's not starting, it SHOULD be starting	*
1364		\*******************************************************/
1365		if (!(fd->flags & FD_MOTOR))
1366		{
1367			fdc->state = MOTORWAIT;
1368			fd_turnon(fdu);
1369			return(0);
1370		}
1371		else	/* at least make sure we are selected */
1372		{
1373			set_motor(fdcu, fd->fdsu, TURNON);
1374		}
1375		fdc->state = DOSEEK;
1376		break;
1377	case DOSEEK:
1378		if (b_cylinder == (unsigned)fd->track)
1379		{
1380			fdc->state = SEEKCOMPLETE;
1381			break;
1382		}
1383		if (fd_cmd(fdcu, 3, NE7CMD_SEEK,
1384			   fd->fdsu, b_cylinder * fd->ft->steptrac,
1385			   0))
1386		{
1387			/*
1388			 * seek command not accepted, looks like
1389			 * the FDC went off to the Saints...
1390			 */
1391			fdc->retry = 6;	/* try a reset */
1392			return(retrier(fdcu));
1393		}
1394		fd->track = FD_NO_TRACK;
1395		fdc->state = SEEKWAIT;
1396		return(0);	/* will return later */
1397	case SEEKWAIT:
1398		/* allow heads to settle */
1399		timeout(fd_pseudointr, (caddr_t)fdcu, hz / 16);
1400		fdc->state = SEEKCOMPLETE;
1401		return(0);	/* will return later */
1402	case SEEKCOMPLETE : /* SEEK DONE, START DMA */
1403		/* Make sure seek really happened*/
1404		if(fd->track == FD_NO_TRACK)
1405		{
1406			int descyl = b_cylinder * fd->ft->steptrac;
1407			do {
1408				/*
1409				 * This might be a "ready changed" interrupt,
1410				 * which cannot really happen since the
1411				 * RDY pin is hardwired to + 5 volts.  This
1412				 * generally indicates a "bouncing" intr
1413				 * line, so do one of the following:
1414				 *
1415				 * When running on an enhanced FDC that is
1416				 * known to not go stuck after responding
1417				 * with INVALID, fetch all interrupt states
1418				 * until seeing either an INVALID or a
1419				 * real interrupt condition.
1420				 *
1421				 * When running on a dumb old NE765, give
1422				 * up immediately.  The controller will
1423				 * provide up to four dummy RC interrupt
1424				 * conditions right after reset (for the
1425				 * corresponding four drives), so this is
1426				 * our only chance to get notice that it
1427				 * was not the FDC that caused the interrupt.
1428				 */
1429				if (fd_sense_int(fdc, &st0, &cyl)
1430				    == FD_NOT_VALID)
1431					return 0;
1432				if(fdc->fdct == FDC_NE765
1433				   && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
1434					return 0; /* hope for a real intr */
1435			} while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
1436
1437			if (0 == descyl)
1438			{
1439				int failed = 0;
1440				/*
1441				 * seek to cyl 0 requested; make sure we are
1442				 * really there
1443				 */
1444				if (fd_sense_drive_status(fdc, &st3))
1445					failed = 1;
1446				if ((st3 & NE7_ST3_T0) == 0) {
1447					printf(
1448		"fd%d: Seek to cyl 0, but not really there (ST3 = %b)\n",
1449					       fdu, st3, NE7_ST3BITS);
1450					failed = 1;
1451				}
1452
1453				if (failed)
1454				{
1455					if(fdc->retry < 3)
1456						fdc->retry = 3;
1457					return(retrier(fdcu));
1458				}
1459			}
1460
1461			if (cyl != descyl)
1462			{
1463				printf(
1464		"fd%d: Seek to cyl %d failed; am at cyl %d (ST0 = 0x%x)\n",
1465				       fdu, descyl, cyl, st0);
1466				return(retrier(fdcu));
1467			}
1468		}
1469
1470		fd->track = b_cylinder;
1471		isa_dmastart(bp->b_flags, bp->b_un.b_addr+fd->skip,
1472			format ? bp->b_bcount : fdblk, fdc->dmachan);
1473		sectrac = fd->ft->sectrac;
1474		sec = blknum %  (sectrac * fd->ft->heads);
1475		head = sec / sectrac;
1476		sec = sec % sectrac + 1;
1477		fd->hddrv = ((head&1)<<2)+fdu;
1478
1479		if(format || !read)
1480		{
1481			/* make sure the drive is writable */
1482			if(fd_sense_drive_status(fdc, &st3) != 0)
1483			{
1484				/* stuck controller? */
1485				fdc->retry = 6;	/* reset the beast */
1486				return(retrier(fdcu));
1487			}
1488			if(st3 & NE7_ST3_WP)
1489			{
1490				/*
1491				 * XXX YES! this is ugly.
1492				 * in order to force the current operation
1493				 * to fail, we will have to fake an FDC
1494				 * error - all error handling is done
1495				 * by the retrier()
1496				 */
1497				fdc->status[0] = NE7_ST0_IC_AT;
1498				fdc->status[1] = NE7_ST1_NW;
1499				fdc->status[2] = 0;
1500				fdc->status[3] = fd->track;
1501				fdc->status[4] = head;
1502				fdc->status[5] = sec;
1503				fdc->retry = 8;	/* break out immediately */
1504				fdc->state = IOTIMEDOUT; /* not really... */
1505				return (1);
1506			}
1507		}
1508
1509		if(format)
1510		{
1511			/* formatting */
1512			if(fd_cmd(fdcu, 6,
1513				  NE7CMD_FORMAT,
1514				  head << 2 | fdu,
1515				  finfo->fd_formb_secshift,
1516				  finfo->fd_formb_nsecs,
1517				  finfo->fd_formb_gaplen,
1518				  finfo->fd_formb_fillbyte,
1519				  0))
1520			{
1521				/* controller fell over */
1522				fdc->retry = 6;
1523				return(retrier(fdcu));
1524			}
1525		}
1526		else
1527		{
1528			if (fd_cmd(fdcu, 9,
1529				   (read ? NE7CMD_READ : NE7CMD_WRITE),
1530				   head << 2 | fdu,  /* head & unit */
1531				   fd->track,        /* track */
1532				   head,
1533				   sec,              /* sector + 1 */
1534				   fd->ft->secsize,  /* sector size */
1535				   sectrac,          /* sectors/track */
1536				   fd->ft->gap,      /* gap size */
1537				   fd->ft->datalen,  /* data length */
1538				   0))
1539			{
1540				/* the beast is sleeping again */
1541				fdc->retry = 6;
1542				return(retrier(fdcu));
1543			}
1544		}
1545		fdc->state = IOCOMPLETE;
1546		fd->tohandle = timeout(fd_timeout, (caddr_t)fdcu, hz);
1547		return(0);	/* will return later */
1548	case IOCOMPLETE: /* IO DONE, post-analyze */
1549		untimeout(fd_timeout, (caddr_t)fdcu, fd->tohandle);
1550
1551		if (fd_read_status(fdc, fd->fdsu))
1552		{
1553			if (fdc->retry < 6)
1554				fdc->retry = 6;	/* force a reset */
1555			return retrier(fdcu);
1556  		}
1557
1558		fdc->state = IOTIMEDOUT;
1559
1560		/* FALLTHROUGH */
1561
1562	case IOTIMEDOUT:
1563		isa_dmadone(bp->b_flags, bp->b_un.b_addr+fd->skip,
1564			    format ? bp->b_bcount : fdblk, fdc->dmachan);
1565		if (fdc->status[0] & NE7_ST0_IC)
1566		{
1567                        if ((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1568			    && fdc->status[1] & NE7_ST1_OR) {
1569                                /*
1570				 * DMA overrun. Someone hogged the bus
1571				 * and didn't release it in time for the
1572				 * next FDC transfer.
1573				 * Just restart it, don't increment retry
1574				 * count. (vak)
1575                                 */
1576                                fdc->state = SEEKCOMPLETE;
1577                                return (1);
1578                        }
1579			else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_IV
1580				&& fdc->retry < 6)
1581				fdc->retry = 6;	/* force a reset */
1582			else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1583				&& fdc->status[2] & NE7_ST2_WC
1584				&& fdc->retry < 3)
1585				fdc->retry = 3;	/* force recalibrate */
1586			return(retrier(fdcu));
1587		}
1588		/* All OK */
1589		fd->skip += fdblk;
1590		if (!format && fd->skip < bp->b_bcount - bp->b_resid)
1591		{
1592			/* set up next transfer */
1593			fdc->state = DOSEEK;
1594		}
1595		else
1596		{
1597			/* ALL DONE */
1598			fd->skip = 0;
1599			bufq_remove(&fdc->head, bp);
1600			biodone(bp);
1601			fdc->fd = (fd_p) 0;
1602			fdc->fdu = -1;
1603			fdc->state = FINDWORK;
1604		}
1605		return(1);
1606	case RESETCTLR:
1607		fdc_reset(fdc);
1608		fdc->retry++;
1609		fdc->state = STARTRECAL;
1610		break;
1611	case STARTRECAL:
1612		/* XXX clear the fdc results from the last reset, if any. */
1613		{
1614			int i;
1615			for (i = 0; i < 4; i++)
1616				(void)fd_sense_int(fdc, &st0, &cyl);
1617		}
1618
1619		if(fd_cmd(fdcu,
1620			  2, NE7CMD_RECAL, fdu,
1621			  0)) /* Recalibrate Function */
1622		{
1623			/* arrgl */
1624			fdc->retry = 6;
1625			return(retrier(fdcu));
1626		}
1627		fdc->state = RECALWAIT;
1628		return(0);	/* will return later */
1629	case RECALWAIT:
1630		/* allow heads to settle */
1631		timeout(fd_pseudointr, (caddr_t)fdcu, hz / 8);
1632		fdc->state = RECALCOMPLETE;
1633		return(0);	/* will return later */
1634	case RECALCOMPLETE:
1635		do {
1636			/*
1637			 * See SEEKCOMPLETE for a comment on this:
1638			 */
1639			if (fd_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
1640				return 0;
1641			if(fdc->fdct == FDC_NE765
1642			   && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
1643				return 0; /* hope for a real intr */
1644		} while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
1645		if ((st0 & NE7_ST0_IC) != NE7_ST0_IC_NT || cyl != 0)
1646		{
1647			if(fdc->retry > 3)
1648				/*
1649				 * a recalibrate from beyond cylinder 77
1650				 * will "fail" due to the FDC limitations;
1651				 * since people used to complain much about
1652				 * the failure message, try not logging
1653				 * this one if it seems to be the first
1654				 * time in a line
1655				 */
1656				printf("fd%d: recal failed ST0 %b cyl %d\n",
1657				       fdu, st0, NE7_ST0BITS, cyl);
1658			if(fdc->retry < 3) fdc->retry = 3;
1659			return(retrier(fdcu));
1660		}
1661		fd->track = 0;
1662		/* Seek (probably) necessary */
1663		fdc->state = DOSEEK;
1664		return(1);	/* will return immediatly */
1665	case MOTORWAIT:
1666		if(fd->flags & FD_MOTOR_WAIT)
1667		{
1668			return(0); /* time's not up yet */
1669		}
1670		/*
1671		 * since the controller was off, it has lost its
1672		 * idea about the current track it were; thus,
1673		 * recalibrate the bastard
1674		 */
1675		fdc->state = STARTRECAL;
1676		return(1);	/* will return immediatly */
1677	default:
1678		printf("fdc%d: Unexpected FD int->", fdcu);
1679		if (fd_read_status(fdc, fd->fdsu) == 0)
1680			printf("FDC status :%lx %lx %lx %lx %lx %lx %lx   ",
1681			       fdc->status[0],
1682			       fdc->status[1],
1683			       fdc->status[2],
1684			       fdc->status[3],
1685			       fdc->status[4],
1686			       fdc->status[5],
1687			       fdc->status[6] );
1688		else
1689			printf("No status available   ");
1690		if (fd_sense_int(fdc, &st0, &cyl) != 0)
1691		{
1692			printf("[controller is dead now]\n");
1693			return(0);
1694		}
1695		printf("ST0 = %x, PCN = %x\n", st0, cyl);
1696		return(0);
1697	}
1698	/*XXX confusing: some branches return immediately, others end up here*/
1699	return(1); /* Come back immediatly to new state */
1700}
1701
1702static int
1703retrier(fdcu)
1704	fdcu_t fdcu;
1705{
1706	fdc_p fdc = fdc_data + fdcu;
1707	register struct buf *bp;
1708
1709	bp = bufq_first(&fdc->head);
1710
1711	if(fd_data[FDUNIT(minor(bp->b_dev))].options & FDOPT_NORETRY)
1712		goto fail;
1713	switch(fdc->retry)
1714	{
1715	case 0: case 1: case 2:
1716		fdc->state = SEEKCOMPLETE;
1717		break;
1718	case 3: case 4: case 5:
1719		fdc->state = STARTRECAL;
1720		break;
1721	case 6:
1722		fdc->state = RESETCTLR;
1723		break;
1724	case 7:
1725		break;
1726	default:
1727	fail:
1728		{
1729			dev_t sav_b_dev = bp->b_dev;
1730			/* Trick diskerr */
1731			bp->b_dev = makedev(major(bp->b_dev),
1732					    (FDUNIT(minor(bp->b_dev))<<3)|RAW_PART);
1733			diskerr(bp, "fd", "hard error", LOG_PRINTF,
1734				fdc->fd->skip / DEV_BSIZE,
1735				(struct disklabel *)NULL);
1736			bp->b_dev = sav_b_dev;
1737			if (fdc->flags & FDC_STAT_VALID)
1738			{
1739				printf(
1740			" (ST0 %b ST1 %b ST2 %b cyl %ld hd %ld sec %ld)\n",
1741				       fdc->status[0], NE7_ST0BITS,
1742				       fdc->status[1], NE7_ST1BITS,
1743				       fdc->status[2], NE7_ST2BITS,
1744				       fdc->status[3], fdc->status[4],
1745				       fdc->status[5]);
1746			}
1747			else
1748				printf(" (No status)\n");
1749		}
1750		bp->b_flags |= B_ERROR;
1751		bp->b_error = EIO;
1752		bp->b_resid += bp->b_bcount - fdc->fd->skip;
1753		bufq_remove(&fdc->head, bp);
1754		fdc->fd->skip = 0;
1755		biodone(bp);
1756		fdc->state = FINDWORK;
1757		fdc->fd = (fd_p) 0;
1758		fdc->fdu = -1;
1759		/* XXX abort current command, if any.  */
1760		return(1);
1761	}
1762	fdc->retry++;
1763	return(1);
1764}
1765
1766static int
1767fdformat(dev, finfo, p)
1768	dev_t dev;
1769	struct fd_formb *finfo;
1770	struct proc *p;
1771{
1772 	fdu_t	fdu;
1773 	fd_p	fd;
1774
1775	struct buf *bp;
1776	int rv = 0, s;
1777	size_t fdblk;
1778
1779 	fdu = FDUNIT(minor(dev));
1780	fd = &fd_data[fdu];
1781	fdblk = 128 << fd->ft->secsize;
1782
1783	/* set up a buffer header for fdstrategy() */
1784	bp = (struct buf *)malloc(sizeof(struct buf), M_TEMP, M_NOWAIT);
1785	if(bp == 0)
1786		return ENOBUFS;
1787	/*
1788	 * keep the process from being swapped
1789	 */
1790	p->p_flag |= P_PHYSIO;
1791	bzero((void *)bp, sizeof(struct buf));
1792	bp->b_flags = B_BUSY | B_PHYS | B_FORMAT;
1793	bp->b_proc = p;
1794	bp->b_dev = dev;
1795
1796	/*
1797	 * calculate a fake blkno, so fdstrategy() would initiate a
1798	 * seek to the requested cylinder
1799	 */
1800	bp->b_blkno = (finfo->cyl * (fd->ft->sectrac * fd->ft->heads)
1801		+ finfo->head * fd->ft->sectrac) * fdblk / DEV_BSIZE;
1802
1803	bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs;
1804	bp->b_un.b_addr = (caddr_t)finfo;
1805
1806	/* now do the format */
1807	fdstrategy(bp);
1808
1809	/* ...and wait for it to complete */
1810	s = splbio();
1811	while(!(bp->b_flags & B_DONE))
1812	{
1813		rv = tsleep((caddr_t)bp, PRIBIO, "fdform", 20 * hz);
1814		if(rv == EWOULDBLOCK)
1815			break;
1816	}
1817	splx(s);
1818
1819	if(rv == EWOULDBLOCK) {
1820		/* timed out */
1821		rv = EIO;
1822		biodone(bp);
1823	}
1824	if(bp->b_flags & B_ERROR)
1825		rv = bp->b_error;
1826	/*
1827	 * allow the process to be swapped
1828	 */
1829	p->p_flag &= ~P_PHYSIO;
1830	free(bp, M_TEMP);
1831	return rv;
1832}
1833
1834/*
1835 * TODO: don't allocate buffer on stack.
1836 */
1837
1838int
1839fdioctl(dev, cmd, addr, flag, p)
1840	dev_t dev;
1841	int cmd;
1842	caddr_t addr;
1843	int flag;
1844	struct proc *p;
1845{
1846 	fdu_t	fdu = FDUNIT(minor(dev));
1847 	fd_p	fd = &fd_data[fdu];
1848	size_t fdblk;
1849
1850	struct fd_type *fdt;
1851	struct disklabel *dl;
1852	char buffer[DEV_BSIZE];
1853	int error = 0;
1854
1855#if NFT > 0
1856	int type = FDTYPE(minor(dev));
1857
1858	/* check for a tape ioctl */
1859	if (type & F_TAPE_TYPE)
1860		return ftioctl(dev, cmd, addr, flag, p);
1861#endif
1862
1863	fdblk = 128 << fd->ft->secsize;
1864
1865	switch (cmd)
1866	{
1867	case DIOCGDINFO:
1868		bzero(buffer, sizeof (buffer));
1869		dl = (struct disklabel *)buffer;
1870		dl->d_secsize = fdblk;
1871		fdt = fd_data[FDUNIT(minor(dev))].ft;
1872		dl->d_secpercyl = fdt->size / fdt->tracks;
1873		dl->d_type = DTYPE_FLOPPY;
1874
1875		if (readdisklabel(dkmodpart(dev, RAW_PART), fdstrategy, dl)
1876		    == NULL)
1877			error = 0;
1878		else
1879			error = EINVAL;
1880
1881		*(struct disklabel *)addr = *dl;
1882		break;
1883
1884	case DIOCSDINFO:
1885		if ((flag & FWRITE) == 0)
1886			error = EBADF;
1887		break;
1888
1889	case DIOCWLABEL:
1890		if ((flag & FWRITE) == 0)
1891			error = EBADF;
1892		break;
1893
1894	case DIOCWDINFO:
1895		if ((flag & FWRITE) == 0)
1896		{
1897			error = EBADF;
1898			break;
1899		}
1900
1901		dl = (struct disklabel *)addr;
1902
1903		if ((error = setdisklabel((struct disklabel *)buffer, dl,
1904					  (u_long)0)) != 0)
1905			break;
1906
1907		error = writedisklabel(dev, fdstrategy,
1908				       (struct disklabel *)buffer);
1909		break;
1910
1911	case FD_FORM:
1912		if((flag & FWRITE) == 0)
1913			error = EBADF;	/* must be opened for writing */
1914		else if(((struct fd_formb *)addr)->format_version !=
1915			FD_FORMAT_VERSION)
1916			error = EINVAL;	/* wrong version of formatting prog */
1917		else
1918			error = fdformat(dev, (struct fd_formb *)addr, p);
1919		break;
1920
1921	case FD_GTYPE:                  /* get drive type */
1922		*(struct fd_type *)addr = *fd_data[FDUNIT(minor(dev))].ft;
1923		break;
1924
1925	case FD_STYPE:                  /* set drive type */
1926		/* this is considered harmful; only allow for superuser */
1927		if(suser(p->p_ucred, &p->p_acflag) != 0)
1928			return EPERM;
1929		*fd_data[FDUNIT(minor(dev))].ft = *(struct fd_type *)addr;
1930		break;
1931
1932	case FD_GOPTS:			/* get drive options */
1933		*(int *)addr = fd_data[FDUNIT(minor(dev))].options;
1934		break;
1935
1936	case FD_SOPTS:			/* set drive options */
1937		fd_data[FDUNIT(minor(dev))].options = *(int *)addr;
1938		break;
1939
1940	default:
1941		error = ENOTTY;
1942		break;
1943	}
1944	return (error);
1945}
1946
1947
1948static fd_devsw_installed = 0;
1949
1950static void 	fd_drvinit(void *notused )
1951{
1952
1953	if( ! fd_devsw_installed ) {
1954		bdevsw_add_generic(BDEV_MAJOR,CDEV_MAJOR, &fd_bdevsw);
1955		fd_devsw_installed = 1;
1956	}
1957}
1958
1959SYSINIT(fddev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,fd_drvinit,NULL)
1960
1961#endif
1962/*
1963 * Hello emacs, these are the
1964 * Local Variables:
1965 *  c-indent-level:               8
1966 *  c-continued-statement-offset: 8
1967 *  c-continued-brace-offset:     0
1968 *  c-brace-offset:              -8
1969 *  c-brace-imaginary-offset:     0
1970 *  c-argdecl-indent:             8
1971 *  c-label-offset:              -8
1972 *  c++-hanging-braces:           1
1973 *  c++-access-specifier-offset: -8
1974 *  c++-empty-arglist-indent:     8
1975 *  c++-friend-offset:            0
1976 * End:
1977 */
1978