4.4BSD/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);
}