[unix-history] / usr / src / sys / i386 / stand / fd.c

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Don Ahn.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)fd.c	8.1 (Berkeley) 6/11/93
 */

/****************************************************************************/
/*                        standalone fd driver                               */
/****************************************************************************/
#include <sys/param.h>
#include <sys/dkbad.h>

#include <i386/isa/disk.h>
#include <i386/isa/fdreg.h>
#include <i386/isa/isa.h>
#include <stand/saio.h>

#define NUMRETRY 10
/*#define FDDEBUG*/

#define NFD 2
#define FDBLK 512
#define NUMTYPES 4

struct fd_type {
	int	sectrac;		/* sectors per track         */
	int	secsize;		/* size code for sectors     */
	int	datalen;		/* data len when secsize = 0 */
	int	gap;			/* gap len between sectors   */
	int	tracks;			/* total num of tracks       */
	int	size;			/* size of disk in sectors   */
	int	steptrac;		/* steps per cylinder        */
	int	trans;			/* transfer speed code       */
};

struct fd_type fd_types[NUMTYPES] = {
 	{ 18,2,0xFF,0x1B,80,2880,1,0 },	/* 1.44 meg HD 3.5in floppy    */
	{ 15,2,0xFF,0x1B,80,2400,1,0 },	/* 1.2 meg HD floppy           */
	{ 9,2,0xFF,0x23,40,720,2,1 },	/* 360k floppy in 1.2meg drive */
	{ 9,2,0xFF,0x2A,40,720,1,1 },	/* 360k floppy in DD drive     */
};


/* state needed for current transfer */
static int fd_type;
static int fd_motor;
static int fd_retry;
static int fd_drive;
static int fd_status[7];

static int fdc = IO_FD1;	/* floppy disk base */

/* Make sure DMA buffer doesn't cross 64k boundary */
char bounce[FDBLK];


/****************************************************************************/
/*                               fdstrategy                                 */
/****************************************************************************/
int
fdstrategy(io,func)
register struct iob *io;
int func;
{
	char *address;
	long nblocks,blknum;
 	int unit, iosize;

#ifdef FDDEBUG
printf("fdstrat ");
#endif
	unit = io->i_unit;
	fd_type = io->i_part;

	/*
	 * Set up block calculations.
	 */
        iosize = io->i_cc / FDBLK;
	blknum = (unsigned long) io->i_bn * DEV_BSIZE / FDBLK;
 	nblocks = fd_types[fd_type].size;
	if ((blknum + iosize > nblocks) || blknum < 0) {
#ifndef SMALL
		printf("bn = %d; sectors = %d; type = %d; fssize = %d ",
			blknum, iosize, fd_type, nblocks);
                printf("fdstrategy - I/O out of filesystem boundaries\n");
#endif
		return(-1);
	}

	address = io->i_ma;
        while (iosize > 0) {
                if (fdio(func, unit, blknum, address))
                        return(-1);
		iosize--;
		blknum++;
                address += FDBLK;
        }
        return(io->i_cc);
}

int
fdio(func, unit, blknum, address)
int func,unit,blknum;
char *address;
{
	int i,j,cyl,sectrac,sec,head,numretry;
	struct fd_type *ft;

 	ft = &fd_types[fd_type];
#ifdef FDDEBUG
printf("fdio ");
#endif

 	sectrac = ft->sectrac;
	cyl = blknum / (2 * sectrac);
	numretry = NUMRETRY;

	if (func == F_WRITE) bcopy(address,bounce,FDBLK);

retry:
	out_fdc(15);	/* Seek function */
	out_fdc(unit);	/* Drive number */
	out_fdc(cyl);

	waitio();

	out_fdc(0x8);
	i = in_fdc(); j = in_fdc();
	if (!(i&0x20) || (cyl != j)) {
		numretry--;
		if (numretry) goto retry;
#ifndef SMALL
		printf("Seek error %d, req = %d, at = %d\n",i,cyl,j);
		printf("unit %d, type %d, sectrac %d, blknum %d\n",
			unit,fd_type,sectrac,blknum);
#endif
		return -1;
	}

	/* set up transfer */
	fd_dma(func == F_READ, bounce, FDBLK);
	sec = blknum %  (sectrac * 2);
	head = sec / sectrac;
	sec = sec % sectrac + 1;
#ifdef FDDEBUG
	printf("sec %d hd %d cyl %d ", sec, head, cyl);
#endif

	if (func == F_READ)  out_fdc(0xE6);/* READ */
	else out_fdc(0xC5);		/* WRITE */
	out_fdc(head << 2 | fd_drive);	/* head & unit */
	out_fdc(cyl);			/* track */
	out_fdc(head);
	out_fdc(sec);			/* sector XXX +1? */
	out_fdc(ft->secsize);		/* sector size */
	out_fdc(sectrac);		/* sectors/track */
	out_fdc(ft->gap);		/* gap size */
	out_fdc(ft->datalen);		/* data length */

	waitio();

	for(i=0;i<7;i++) {
		fd_status[i] = in_fdc();
	}
	if (fd_status[0]&0xF8) {
		numretry--;
		if (numretry) goto retry;
#ifndef SMALL
		printf("FD err %lx %lx %lx %lx %lx %lx %lx\n",
		fd_status[0], fd_status[1], fd_status[2], fd_status[3],
		fd_status[4], fd_status[5], fd_status[6] );
#endif
		return -1;
	}
	if (func == F_READ) bcopy(bounce,address,FDBLK);
	return 0;
}

/****************************************************************************/
/*                             fdc in/out                                   */
/****************************************************************************/
int
in_fdc()
{
	int i;
	while ((i = inb(fdc+fdsts) & 192) != 192) if (i == 128) return -1;
	return inb(0x3f5);
}

dump_stat()
{
	int i;
	for(i=0;i<7;i++) {
		fd_status[i] = in_fdc();
		if (fd_status[i] < 0) break;
	}
#ifdef FDDEBUGx
printf("FD bad status :%lx %lx %lx %lx %lx %lx %lx\n",
	fd_status[0], fd_status[1], fd_status[2], fd_status[3],
	fd_status[4], fd_status[5], fd_status[6] );
#endif
}

set_intr()
{
	/* initialize 8259's */
	outb(0x20,0x11);
	outb(0x21,32);
	outb(0x21,4);
	outb(0x21,1);
	outb(0x21,0x0f); /* turn on int 6 */

/*
	outb(0xa0,0x11);
	outb(0xa1,40);
	outb(0xa1,2);
	outb(0xa1,1);
	outb(0xa1,0xff); */

}


waitio()
{
char c;
int n;

	do
		outb(0x20,0xc); /* read polled interrupt */
	while ((c=inb(0x20))&0x7f != 6); /* wait for int */
	outb(0x20,0x20);
}

out_fdc(x)
int x;
{
	int r;
	do {
		r = (inb(fdc+fdsts) & 192);
		if (r==128) break;
		if (r==192) {
			dump_stat(); /* error: direction. eat up output */
		}
	} while (1);
	outb(0x3f5,x&0xFF);
}


/****************************************************************************/
/*                           fdopen/fdclose                                 */
/****************************************************************************/
fdopen(io)
	register struct iob *io;
{
	int unit, type, i;
	struct fd_type *ft;

	unit = io->i_unit;
	type = io->i_part;
	io->i_boff = 0;		/* no disklabels -- tar/dump wont work */
#ifdef FDDEBUG
	printf("fdopen %d %d ", unit, type);
#endif
 	ft = &fd_types[type];
	fd_drive = unit;

	set_intr(); /* init intr cont */

	/* Try a reset, keep motor on */
	outb(0x3f2,0);
	for(i=0; i < 100000; i++);
	outb(0x3f2,unit | (unit  ? 32 : 16) );
	for(i=0; i < 100000; i++);
	outb(0x3f2,unit | 0xC | (unit  ? 32 : 16) );
	outb(0x3f7,ft->trans);
	fd_motor = 1;

	waitio();

	out_fdc(3); /* specify command */
	out_fdc(0xDF);
	out_fdc(2);

	out_fdc(7);	/* Recalibrate Function */
	out_fdc(unit);

	waitio();
	return(0);
}


/****************************************************************************/
/*                                 fd_dma                                   */
/* set up DMA read/write operation and virtual address addr for nbytes      */
/****************************************************************************/
fd_dma(read,addr,nbytes)
int read;
unsigned long addr;
int nbytes;
{
	/* Set read/write bytes */
	if (read) {
		outb(0xC,0x46); outb(0xB,0x46);
	} else {
		outb(0xC,0x4A); outb(0xB,0x4A);
	}
	/* Send start address */
	outb(0x4,addr & 0xFF);
	outb(0x4,(addr>>8) & 0xFF);
	outb(0x81,(addr>>16) & 0xFF);
	/* Send count */
	nbytes--;
	outb(0x5,nbytes & 0xFF);
	outb(0x5,(nbytes>>8) & 0xFF);
	/* set channel 2 */
	outb(0x0A,2);
}
Commit	Line	Data
40118d23	1	/*-
ad787160 C	2	* Copyright (c) 1990, 1993
ad787160 C	3	* The Regents of the University of California. All rights reserved.
40118d23 WN	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Don Ahn.
	7	*
ad787160 C	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. Neither the name of the University nor the names of its contributors
	21	* may be used to endorse or promote products derived from this software
	22	* without specific prior written permission.
40118d23	23	*
ad787160 C	24	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	28	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	29	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	* SUCH DAMAGE.
	35	*
	36	* @(#)fd.c 8.1 (Berkeley) 6/11/93
40118d23 WN	37	*/
	38
	39	/****************************************************************************/
	40	/* standalone fd driver */
	41	/****************************************************************************/
38a01dbe KB	42	#include <sys/param.h>
	43	#include <sys/dkbad.h>
	44
	45	#include <i386/isa/disk.h>
	46	#include <i386/isa/fdreg.h>
	47	#include <i386/isa/isa.h>
	48	#include <stand/saio.h>
40118d23 WN	49
	50	#define NUMRETRY 10
	51	/#define FDDEBUG/
	52
	53	#define NFD 2
	54	#define FDBLK 512
	55	#define NUMTYPES 4
	56
	57	struct fd_type {
	58	int sectrac; /* sectors per track */
	59	int secsize; /* size code for sectors */
	60	int datalen; /* data len when secsize = 0 */
	61	int gap; /* gap len between sectors */
	62	int tracks; /* total num of tracks */
	63	int size; /* size of disk in sectors */
	64	int steptrac; /* steps per cylinder */
	65	int trans; /* transfer speed code */
	66	};
	67
	68	struct fd_type fd_types[NUMTYPES] = {
	69	{ 18,2,0xFF,0x1B,80,2880,1,0 }, /* 1.44 meg HD 3.5in floppy */
	70	{ 15,2,0xFF,0x1B,80,2400,1,0 }, /* 1.2 meg HD floppy */
	71	{ 9,2,0xFF,0x23,40,720,2,1 }, /* 360k floppy in 1.2meg drive */
	72	{ 9,2,0xFF,0x2A,40,720,1,1 }, /* 360k floppy in DD drive */
	73	};
	74
	75
	76	/* state needed for current transfer */
	77	static int fd_type;
	78	static int fd_motor;
	79	static int fd_retry;
	80	static int fd_drive;
	81	static int fd_status[7];
	82
	83	static int fdc = IO_FD1; /* floppy disk base */
	84
	85	/* Make sure DMA buffer doesn't cross 64k boundary */
	86	char bounce[FDBLK];
	87
	88
	89	/****************************************************************************/
	90	/* fdstrategy */
	91	/****************************************************************************/
	92	int
	93	fdstrategy(io,func)
	94	register struct iob *io;
	95	int func;
	96	{
	97	char *address;
	98	long nblocks,blknum;
	99	int unit, iosize;
	100
	101	#ifdef FDDEBUG
	102	printf("fdstrat ");
	103	#endif
	104	unit = io->i_unit;
	105	fd_type = io->i_part;
	106
	107	/*
	108	* Set up block calculations.
	109	*/
	110	iosize = io->i_cc / FDBLK;
	111	blknum = (unsigned long) io->i_bn * DEV_BSIZE / FDBLK;
	112	nblocks = fd_types[fd_type].size;
113	if ((blknum + iosize > nblocks) \|\| blknum < 0) {
114	#ifndef SMALL
115	printf("bn = %d; sectors = %d; type = %d; fssize = %d ",
116	blknum, iosize, fd_type, nblocks);
117	printf("fdstrategy - I/O out of filesystem boundaries\n");
118	#endif
119	return(-1);
120	}
121
122	address = io->i_ma;
123	while (iosize > 0) {
124	if (fdio(func, unit, blknum, address))
125	return(-1);
126	iosize--;
127	blknum++;
128	address += FDBLK;
129	}
130	return(io->i_cc);
131	}
132
133	int
134	fdio(func, unit, blknum, address)
135	int func,unit,blknum;
136	char *address;
137	{
138	int i,j,cyl,sectrac,sec,head,numretry;
139	struct fd_type *ft;
140
141	ft = &fd_types[fd_type];
142	#ifdef FDDEBUG
143	printf("fdio ");
144	#endif
145
146	sectrac = ft->sectrac;
147	cyl = blknum / (2 * sectrac);
148	numretry = NUMRETRY;
149
e698f3b5	150	if (func == F_WRITE) bcopy(address,bounce,FDBLK);
40118d23 WN	151
	152	retry:
	153	out_fdc(15); /* Seek function */
	154	out_fdc(unit); /* Drive number */
	155	out_fdc(cyl);
	156
	157	waitio();
	158
	159	out_fdc(0x8);
	160	i = in_fdc(); j = in_fdc();
	161	if (!(i&0x20) \|\| (cyl != j)) {
	162	numretry--;
	163	if (numretry) goto retry;
	164	#ifndef SMALL
	165	printf("Seek error %d, req = %d, at = %d\n",i,cyl,j);
	166	printf("unit %d, type %d, sectrac %d, blknum %d\n",
	167	unit,fd_type,sectrac,blknum);
	168	#endif
	169	return -1;
	170	}
	171
	172	/* set up transfer */
e698f3b5	173	fd_dma(func == F_READ, bounce, FDBLK);
40118d23 WN	174	sec = blknum % (sectrac * 2);
	175	head = sec / sectrac;
	176	sec = sec % sectrac + 1;
	177	#ifdef FDDEBUG
	178	printf("sec %d hd %d cyl %d ", sec, head, cyl);
	179	#endif
	180
e698f3b5	181	if (func == F_READ) out_fdc(0xE6);/* READ */
40118d23 WN	182	else out_fdc(0xC5); /* WRITE */
	183	out_fdc(head << 2 \| fd_drive); /* head & unit */
	184	out_fdc(cyl); /* track */
	185	out_fdc(head);
	186	out_fdc(sec); /* sector XXX +1? */
	187	out_fdc(ft->secsize); /* sector size */
	188	out_fdc(sectrac); /* sectors/track */
	189	out_fdc(ft->gap); /* gap size */
	190	out_fdc(ft->datalen); /* data length */
	191
	192	waitio();
	193
	194	for(i=0;i<7;i++) {
	195	fd_status[i] = in_fdc();
	196	}
	197	if (fd_status[0]&0xF8) {
	198	numretry--;
	199	if (numretry) goto retry;
	200	#ifndef SMALL
d7070096	201	printf("FD err %lx %lx %lx %lx %lx %lx %lx\n",
40118d23 WN	202	fd_status[0], fd_status[1], fd_status[2], fd_status[3],
	203	fd_status[4], fd_status[5], fd_status[6] );
	204	#endif
	205	return -1;
	206	}
e698f3b5	207	if (func == F_READ) bcopy(bounce,address,FDBLK);
40118d23 WN	208	return 0;
	209	}
	210
	211	/****************************************************************************/
	212	/* fdc in/out */
	213	/****************************************************************************/
	214	int
	215	in_fdc()
	216	{
	217	int i;
	218	while ((i = inb(fdc+fdsts) & 192) != 192) if (i == 128) return -1;
	219	return inb(0x3f5);
	220	}
	221
	222	dump_stat()
	223	{
	224	int i;
	225	for(i=0;i<7;i++) {
	226	fd_status[i] = in_fdc();
	227	if (fd_status[i] < 0) break;
	228	}
	229	#ifdef FDDEBUGx
d7070096	230	printf("FD bad status :%lx %lx %lx %lx %lx %lx %lx\n",
40118d23 WN	231	fd_status[0], fd_status[1], fd_status[2], fd_status[3],
	232	fd_status[4], fd_status[5], fd_status[6] );
	233	#endif
	234	}
	235
	236	set_intr()
	237	{
	238	/* initialize 8259's */
	239	outb(0x20,0x11);
	240	outb(0x21,32);
	241	outb(0x21,4);
	242	outb(0x21,1);
	243	outb(0x21,0x0f); /* turn on int 6 */
	244
	245	/*
	246	outb(0xa0,0x11);
	247	outb(0xa1,40);
	248	outb(0xa1,2);
	249	outb(0xa1,1);
	250	outb(0xa1,0xff); */
	251
	252	}
	253
	254
	255
	256	waitio()
	257	{
	258	char c;
	259	int n;
	260
	261	do
	262	outb(0x20,0xc); /* read polled interrupt */
	263	while ((c=inb(0x20))&0x7f != 6); /* wait for int */
	264	outb(0x20,0x20);
	265	}
	266
	267	out_fdc(x)
	268	int x;
	269	{
	270	int r;
	271	do {
	272	r = (inb(fdc+fdsts) & 192);
	273	if (r==128) break;
	274	if (r==192) {
	275	dump_stat(); /* error: direction. eat up output */
	276	}
	277	} while (1);
	278	outb(0x3f5,x&0xFF);
	279	}
	280
	281
	282	/****************************************************************************/
	283	/* fdopen/fdclose */
	284	/****************************************************************************/
	285	fdopen(io)
	286	register struct iob *io;
	287	{
	288	int unit, type, i;
	289	struct fd_type *ft;
	290
	291	unit = io->i_unit;
	292	type = io->i_part;
	293	io->i_boff = 0; /* no disklabels -- tar/dump wont work */
	294	#ifdef FDDEBUG
295	printf("fdopen %d %d ", unit, type);
296	#endif
297	ft = &fd_types[type];
298	fd_drive = unit;
299
300	set_intr(); /* init intr cont */
301
302	/* Try a reset, keep motor on */
303	outb(0x3f2,0);
304	for(i=0; i < 100000; i++);
305	outb(0x3f2,unit \| (unit ? 32 : 16) );
306	for(i=0; i < 100000; i++);
307	outb(0x3f2,unit \| 0xC \| (unit ? 32 : 16) );
308	outb(0x3f7,ft->trans);
309	fd_motor = 1;
310
311	waitio();
312
313	out_fdc(3); /* specify command */
314	out_fdc(0xDF);
315	out_fdc(2);
316
317	out_fdc(7); /* Recalibrate Function */
318	out_fdc(unit);
319
320	waitio();
321	return(0);
322	}
323
324
325	/****************************************************************************/
326	/* fd_dma */
327	/* set up DMA read/write operation and virtual address addr for nbytes */
328	/****************************************************************************/
329	fd_dma(read,addr,nbytes)
330	int read;
331	unsigned long addr;
332	int nbytes;
333	{
334	/* Set read/write bytes */
335	if (read) {
336	outb(0xC,0x46); outb(0xB,0x46);
337	} else {
338	outb(0xC,0x4A); outb(0xB,0x4A);
339	}
340	/* Send start address */
341	outb(0x4,addr & 0xFF);
342	outb(0x4,(addr>>8) & 0xFF);
343	outb(0x81,(addr>>16) & 0xFF);
344	/* Send count */
345	nbytes--;
346	outb(0x5,nbytes & 0xFF);
347	outb(0x5,(nbytes>>8) & 0xFF);
348	/* set channel 2 */
349	outb(0x0A,2);
350	}
351