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NetBSD/sys/dev/isa/wd.c

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/*
* Copyright (c) 1994 Charles Hannum.
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
*
* from: @(#)wd.c 7.2 (Berkeley) 5/9/91
* $Id: wd.c,v 1.48 1994/02/26 17:59:46 mycroft Exp $
*/
#define QUIETWORKS /* define this to make wdopen() set DKFL_QUIET */
#define INSTRUMENT /* instrumentation stuff by Brad Parker */
/* TODO: peel out buffer at low ipl, speed improvement */
/* TODO: find and fix the timing bugs apparent on some controllers */
#include "wd.h"
#if NWDC > 0
#include <sys/param.h>
#include <sys/dkbad.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/disklabel.h>
#include <sys/buf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#ifdef INSTRUMENT
#include <sys/dkstat.h>
#endif
#include <vm/vm.h>
#include <machine/cpu.h>
#include <machine/cpufunc.h>
#include <machine/pio.h>
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/icu.h>
#include <i386/isa/wdreg.h>
#ifndef WDCNDELAY
#define WDCNDELAY 100000 /* delay = 100us; so 10s for a controller state change */
#endif
#define WDCDELAY 100
/* if you enable this, it will report any delays more than 100us * N long */
/*#define WDCNDELAY_DEBUG 2*/
#define WDIORETRIES 5 /* number of retries before giving up */
#define wdnoreloc(dev) (minor(dev) & 0x80) /* ignore partition table */
#define wdunit(dev) ((minor(dev) & 0x38) >> 3)
#define wdpart(dev) (minor(dev) & 0x7)
#define makewddev(maj, unit, part) (makedev(maj, ((unit << 3) + part)))
#define WDRAW 3 /* 'd' partition isn't a partition! */
#define b_cylin b_resid /* cylinder number for doing IO to */
/* shares an entry in the buf struct */
/*
* Drive states. Used to initialize drive.
*/
#define CLOSED 0 /* disk is closed. */
#define WANTOPEN 1 /* open requested, not started */
#define RECAL 2 /* doing restore */
#define OPEN 3 /* done with open */
/*
* Drive status.
*/
struct disk {
long dk_bc; /* byte count left */
long dk_bct; /* total byte count left */
short dk_skip; /* blocks already transferred */
short dk_skipm; /* blocks already transferred for multi */
char dk_ctrlr; /* physical controller number */
char dk_unit; /* physical unit number */
char dk_lunit; /* logical unit number */
char dk_state; /* control state */
u_char dk_status; /* copy of status reg. */
u_char dk_error; /* copy of error reg. */
short dk_port; /* i/o port base */
u_long dk_copenpart; /* character units open on this drive */
u_long dk_bopenpart; /* block units open on this drive */
u_long dk_openpart; /* all units open on this drive */
short dk_wlabel; /* label writable? */
short dk_flags; /* drive characteistics found */
#define DKFL_QUIET 0x00002 /* report errors back, but don't complain */
#define DKFL_SINGLE 0x00004 /* sector at a time mode */
#define DKFL_ERROR 0x00008 /* processing a disk error */
#define DKFL_BSDLABEL 0x00010 /* has a BSD disk label */
#define DKFL_BADSECT 0x00020 /* has a bad144 badsector table */
#define DKFL_WRITEPROT 0x00040 /* manual unit write protect */
struct wdparams dk_params; /* ESDI/IDE drive/controller parameters */
struct disklabel dk_dd; /* device configuration data */
struct cpu_disklabel dk_cpd;
long dk_badsect[127]; /* 126 plus trailing -1 marker */
};
struct board {
short dkc_port;
};
struct board wdcontroller[NWDC];
struct disk *wddrives[NWD]; /* table of units */
struct buf wdtab[NWDC]; /* various per-controller info */
struct buf wdutab[NWD]; /* head of queue per drive */
struct buf rwdbuf[NWD]; /* buffers for raw IO */
long wdxfer[NWD]; /* count of transfers */
int wdtimeoutstatus[NWD]; /* timeout counters */
int wdprobe(), wdattach();
struct isa_driver wdcdriver = {
wdprobe, wdattach, "wdc",
};
static void wdustart(struct disk *);
static void wdstart(int);
static int wdcommand(struct disk *, int);
static int wdcontrol(struct buf *);
static int wdsetctlr(dev_t, struct disk *);
static int wdgetctlr(int, struct disk *);
static void bad144intern(struct disk *);
static int wdreset(int, int, int);
static int wdtimeout(caddr_t);
int wdc_wait(int, int, int, int);
#define wait_for_drq(p, u) wdc_wait((p)+wd_status, u, 0, WDCS_DRQ)
#define wait_for_ready(p, u) wdc_wait((p)+wd_status, u, 0, WDCS_READY)
#define wait_for_unbusy(p, u) wdc_wait((p)+wd_status, u, WDCS_BUSY, 0)
/*
* Probe for controller.
*/
int
wdprobe(struct isa_device *dvp)
{
struct disk *du;
int wdc;
if (dvp->id_unit >= NWDC)
return 0;
du = (struct disk *)malloc(sizeof(struct disk), M_TEMP, M_NOWAIT);
bzero(du, sizeof(struct disk));
du->dk_ctrlr = dvp->id_unit;
du->dk_unit = 0;
du->dk_lunit = 0;
wdcontroller[dvp->id_unit].dkc_port = dvp->id_iobase;
wdc = du->dk_port = dvp->id_iobase;
/* check if we have registers that work */
outb(wdc+wd_error, 0x5a); /* error register not writable */
outb(wdc+wd_cyl_lo, 0xa5); /* but all of cyllo are implemented */
if (inb(wdc+wd_error) == 0x5a || inb(wdc+wd_cyl_lo) != 0xa5)
goto nodevice;
wdreset(dvp->id_unit, wdc, 0);
/* execute a controller only command */
if (wdcommand(du, WDCC_DIAGNOSE) < 0)
goto nodevice;
bzero(&wdtab[du->dk_ctrlr], sizeof(struct buf));
free(du, M_TEMP);
return 8;
nodevice:
free(du, M_TEMP);
return 0;
}
/*
* Called for the controller too
* Attach each drive if possible.
*/
int
wdattach(struct isa_device *dvp)
{
int unit, lunit;
struct disk *du;
if (dvp->id_masunit == -1)
return 0;
if (dvp->id_masunit >= NWDC)
return 0;
lunit = dvp->id_unit;
if (lunit == -1) {
printf("wdc%d: cannot support unit ?\n", dvp->id_masunit);
return 0;
}
if (lunit >= NWD)
return 0;
unit = dvp->id_physid;
du = wddrives[lunit] =
(struct disk *)malloc(sizeof(struct disk), M_TEMP, M_NOWAIT);
bzero(du, sizeof(struct disk));
bzero(&wdutab[lunit], sizeof(struct buf));
bzero(&rwdbuf[lunit], sizeof(struct buf));
wdxfer[lunit] = 0;
wdtimeoutstatus[lunit] = 0;
wdtimeout(lunit);
du->dk_ctrlr = dvp->id_masunit;
du->dk_unit = unit;
du->dk_lunit = lunit;
du->dk_port = wdcontroller[dvp->id_masunit].dkc_port;
if (wdgetctlr(unit, du) == 0) {
int i, blank;
printf("wd%d at wdc%d targ %d: ", dvp->id_unit,
dvp->id_masunit, dvp->id_physid);
if (du->dk_params.wdp_heads == 0)
printf("(unknown size) <");
else
printf("%dMB %d cyl, %d head, %d sec <",
du->dk_dd.d_ncylinders * du->dk_dd.d_secpercyl /
(1048576 / DEV_BSIZE),
du->dk_dd.d_ncylinders, du->dk_dd.d_ntracks,
du->dk_dd.d_nsectors);
for (i = blank = 0; i < sizeof(du->dk_params.wdp_model); i++) {
char c = du->dk_params.wdp_model[i];
if (!c)
break;
if (blank && c == ' ')
continue;
if (blank && c != ' ') {
printf(" %c", c);
blank = 0;
continue;
}
if (c == ' ')
blank = 1;
else
printf("%c", c);
}
printf(">\n");
} else {
/*printf("wd%d at wdc%d slave %d -- error\n", lunit,
dvp->id_masunit, unit);*/
wddrives[lunit] = 0;
free(du, M_TEMP);
return 0;
}
return 1;
}
/* Read/write routine for a buffer. Finds the proper unit, range checks
* arguments, and schedules the transfer. Does not wait for the transfer
* to complete. Multi-page transfers are supported. All I/O requests must
* be a multiple of a sector in length.
*/
int
wdstrategy(register struct buf *bp)
{
register struct buf *dp;
struct disk *du; /* Disk unit to do the IO. */
int lunit = wdunit(bp->b_dev);
int s;
/* valid unit, controller, and request? */
if (lunit >= NWD || bp->b_blkno < 0 ||
howmany(bp->b_bcount, DEV_BSIZE) >= (1 << NBBY) ||
(du = wddrives[lunit]) == 0) {
bp->b_error = EINVAL;
bp->b_flags |= B_ERROR;
goto done;
}
/* "soft" write protect check */
if ((du->dk_flags & DKFL_WRITEPROT) && (bp->b_flags & B_READ) == 0) {
bp->b_error = EROFS;
bp->b_flags |= B_ERROR;
goto done;
}
/* have partitions and want to use them? */
if ((du->dk_flags & DKFL_BSDLABEL) != 0 && wdpart(bp->b_dev) != WDRAW) {
/*
* do bounds checking, adjust transfer. if error, process.
* if end of partition, just return
*/
if (bounds_check_with_label(bp, &du->dk_dd, du->dk_wlabel) <= 0)
goto done;
/* otherwise, process transfer request */
}
/* don't bother */
bp->b_cylin = 0;
/* queue transfer on drive, activate drive and controller if idle */
dp = &wdutab[lunit];
s = splbio();
disksort(dp, bp);
if (dp->b_active == 0)
wdustart(du); /* start drive */
if (wdtab[du->dk_ctrlr].b_active == 0)
wdstart(du->dk_ctrlr); /* start controller */
splx(s);
return 0;
done:
/* toss transfer, we're done early */
biodone(bp);
}
/*
* Routine to queue a command to the controller. The unit's
* request is linked into the active list for the controller.
* If the controller is idle, the transfer is started.
*/
static void
wdustart(register struct disk *du)
{
register struct buf *bp, *dp = &wdutab[du->dk_lunit];
int ctrlr = du->dk_ctrlr;
/* unit already active? */
if (dp->b_active)
return;
/* anything to start? */
bp = dp->b_actf;
if (bp == NULL)
return;
/* link onto controller queue */
dp->b_forw = NULL;
if (wdtab[ctrlr].b_actf == NULL)
wdtab[ctrlr].b_actf = dp;
else
wdtab[ctrlr].b_actl->b_forw = dp;
wdtab[ctrlr].b_actl = dp;
/* mark the drive unit as busy */
dp->b_active = 1;
}
/*
* Controller startup routine. This does the calculation, and starts
* a single-sector read or write operation. Called to start a transfer,
* or from the interrupt routine to continue a multi-sector transfer.
* RESTRICTIONS:
* 1. The transfer length must be an exact multiple of the sector size.
*/
static void
wdstart(int ctrlr)
{
register struct disk *du; /* disk unit for IO */
register struct buf *bp;
struct disklabel *lp;
struct buf *dp;
long blknum, cylin, head, sector;
long secpertrk, secpercyl, addr;
int lunit, wdc;
int xfrblknum;
unsigned char status;
loop:
/* is there a drive for the controller to do a transfer with? */
dp = wdtab[ctrlr].b_actf;
if (dp == NULL)
return;
/* is there a transfer to this drive ? if so, link it on
the controller's queue */
bp = dp->b_actf;
if (bp == NULL) {
wdtab[ctrlr].b_actf = dp->b_forw;
goto loop;
}
/* obtain controller and drive information */
lunit = wdunit(bp->b_dev);
du = wddrives[lunit];
/* if not really a transfer, do control operations specially */
if (du->dk_state < OPEN) {
(void) wdcontrol(bp);
return;
}
/* calculate transfer details */
blknum = bp->b_blkno + du->dk_skip;
#ifdef WDDEBUG
if (du->dk_skip == 0)
printf("\nwdstart %d: %s %d@%d; map ", lunit,
(bp->b_flags & B_READ) ? "read" : "write", bp->b_bcount,
blknum);
else
printf(" %d)%x", du->dk_skip, inb(du->dk_port+wd_altsts));
#endif
addr = (int)bp->b_un.b_addr;
if (du->dk_skip == 0)
du->dk_bc = bp->b_bcount;
if (du->dk_skipm == 0) {
struct buf *oldbp, *nextbp;
oldbp = bp;
nextbp = bp->b_actf;
du->dk_bct = du->dk_bc;
oldbp->b_flags |= B_XXX;
while (nextbp && (oldbp->b_flags & DKFL_SINGLE) == 0 &&
oldbp->b_dev == nextbp->b_dev && nextbp->b_blkno ==
(oldbp->b_blkno + (oldbp->b_bcount / DEV_BSIZE)) &&
(oldbp->b_flags & B_READ) == (nextbp->b_flags & B_READ)) {
if ((du->dk_bct + nextbp->b_bcount) / DEV_BSIZE >= 240)
break;
du->dk_bct += nextbp->b_bcount;
oldbp->b_flags |= B_XXX;
oldbp = nextbp;
nextbp = nextbp->b_actf;
}
}
lp = &du->dk_dd;
secpertrk = lp->d_nsectors;
secpercyl = lp->d_secpercyl;
if ((du->dk_flags & DKFL_BSDLABEL) != 0 && wdpart(bp->b_dev) != WDRAW)
blknum += lp->d_partitions[wdpart(bp->b_dev)].p_offset;
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
/* Check for bad sectors if we have them, and not formatting */
/* Only do this in single-sector mode, or when starting a */
/* multiple-sector transfer. */
if ((du->dk_flags & DKFL_BADSECT) &&
#ifdef B_FORMAT
(bp->b_flags & B_FORMAT) == 0 &&
#endif
(du->dk_skipm == 0 || (du->dk_flags & DKFL_SINGLE))) {
long blkchk, blkend, blknew;
int i;
blkend = blknum + howmany(du->dk_bct, DEV_BSIZE) - 1;
for (i = 0; (blkchk = du->dk_badsect[i]) != -1; i++) {
if (blkchk > blkend)
break; /* transfer is completely OK; done */
if (blkchk == blknum) {
blknew =
lp->d_secperunit - lp->d_nsectors - i - 1;
cylin = blknew / secpercyl;
head = (blknew % secpercyl) / secpertrk;
sector = blknew % secpertrk;
du->dk_flags |= DKFL_SINGLE;
/* found and replaced first blk of transfer; done */
break;
} else if (blkchk > blknum) {
du->dk_flags |= DKFL_SINGLE;
break; /* bad block inside transfer; done */
}
}
}
if (du->dk_flags & DKFL_SINGLE) {
du->dk_bct = du->dk_bc;
du->dk_skipm = du->dk_skip;
}
#ifdef WDDEBUG
pg("c%d h%d s%d ", cylin, head, sector);
#endif
sector += 1; /* sectors begin with 1, not 0 */
wdtab[ctrlr].b_active = 1; /* mark controller active */
wdc = du->dk_port;
#ifdef INSTRUMENT
/* instrumentation */
if (du->dk_unit >= 0 && du->dk_skip == 0) {
dk_busy |= 1 << du->dk_lunit;
dk_wds[du->dk_lunit] += bp->b_bcount >> 6;
}
if (du->dk_unit >= 0 && du->dk_skipm == 0) {
++dk_seek[du->dk_lunit];
++dk_xfer[du->dk_lunit];
}
#endif
retry:
/* if starting a multisector transfer, or doing single transfers */
if (du->dk_skipm == 0 || (du->dk_flags & DKFL_SINGLE)) {
if (wdtab[ctrlr].b_errcnt && (bp->b_flags & B_READ) == 0) {
du->dk_bc += DEV_BSIZE;
du->dk_bct += DEV_BSIZE;
}
/* controller idle? */
if (wait_for_unbusy(wdc, ctrlr) == -1)
wdreset(ctrlr, wdc, 1);
/* stuff the task file */
outb(wdc+wd_precomp, lp->d_precompcyl / 4);
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT) {
outb(wdc+wd_sector, lp->d_gap3);
outb(wdc+wd_seccnt, lp->d_nsectors);
} else {
if (du->dk_flags & DKFL_SINGLE)
outb(wdc+wd_seccnt, 1);
else
outb(wdc+wd_seccnt,
howmany(du->dk_bct, DEV_BSIZE));
outb(wdc+wd_sector, sector);
}
#else
if (du->dk_flags & DKFL_SINGLE)
outb(wdc+wd_seccnt, 1);
else
outb(wdc+wd_seccnt, howmany(du->dk_bct, DEV_BSIZE));
outb(wdc+wd_sector, sector);
#endif
outb(wdc+wd_cyl_lo, cylin);
outb(wdc+wd_cyl_hi, cylin >> 8);
/* set up the SDH register (select drive) */
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit<<4) | (head & 0xf));
/* wait for drive to become ready */
if (wait_for_ready(wdc, ctrlr) == -1) {
wdreset(ctrlr, wdc, 1);
goto retry;
}
/* initiate command! */
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT)
outb(wdc+wd_command, WDCC_FORMAT);
else
outb(wdc+wd_command,
(bp->b_flags & B_READ) ? WDCC_READ : WDCC_WRITE);
#else
outb(wdc+wd_command,
(bp->b_flags & B_READ) ? WDCC_READ : WDCC_WRITE);
#endif
#ifdef WDDEBUG
printf("sector %d cylin %d head %d addr %x sts %x\n", sector,
cylin, head, addr, inb(wdc+wd_altsts));
#endif
}
/* if this is a read operation, just go away until it's done. */
if (bp->b_flags & B_READ) {
wdtimeoutstatus[lunit] = 2;
return;
}
/* ready to send data? */
if (wait_for_drq(wdc, ctrlr) == -1) {
wdreset(ctrlr, wdc, 1);
goto retry;
}
/* then send it! */
outagain:
outsw(wdc+wd_data, addr + du->dk_skip * DEV_BSIZE,
DEV_BSIZE / sizeof(short));
du->dk_bc -= DEV_BSIZE;
du->dk_bct -= DEV_BSIZE;
wdtimeoutstatus[lunit] = 2;
}
/* Interrupt routine for the controller. Acknowledge the interrupt, check for
* errors on the current operation, mark it done if necessary, and start
* the next request. Also check for a partially done transfer, and
* continue with the next chunk if so.
*/
void
wdintr(struct intrframe wdif)
{
register struct disk *du;
register struct buf *bp, *dp;
int stat, wdc, ctrlr;
ctrlr = wdif.if_vec;
if (!wdtab[ctrlr].b_active) {
printf("wdc%d: extra interrupt\n", ctrlr);
return;
}
dp = wdtab[ctrlr].b_actf;
bp = dp->b_actf;
du = wddrives[wdunit(bp->b_dev)];
wdc = du->dk_port;
wdtimeoutstatus[wdunit(bp->b_dev)] = 0;
#ifdef WDDEBUG
printf("I%d ", ctrlr);
#endif
stat = wait_for_unbusy(wdc, ctrlr);
if (stat == -1) {
/* XXXX looks bogus */
wdstart(ctrlr);
printf("wdc%d: timeout in wdintr WDCS_BUSY\n", ctrlr);
}
/* is it not a transfer, but a control operation? */
if (du->dk_state < OPEN) {
wdtab[ctrlr].b_active = 0;
if (wdcontrol(bp))
wdstart(ctrlr);
return;
}
/* have we an error? */
if (stat & (WDCS_ERR | WDCS_ECCCOR)) {
du->dk_status = stat;
du->dk_error = inb(wdc+wd_error);
#ifdef WDDEBUG
printf("stat %x error %x\n", stat, du->dk_error);
#endif
if ((du->dk_flags & DKFL_SINGLE) == 0) {
du->dk_flags |= DKFL_ERROR;
goto outt;
}
#ifdef B_FORMAT
if (bp->b_flags & B_FORMAT) {
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
goto done;
}
#endif
/* error or error correction? */
if (stat & WDCS_ERR) {
if (++wdtab[ctrlr].b_errcnt < WDIORETRIES)
wdtab[ctrlr].b_active = 0;
else {
if ((du->dk_flags & DKFL_QUIET) == 0) {
diskerr(bp, "wd", "hard error",
LOG_PRINTF, du->dk_skip,
&du->dk_dd);
#ifdef WDDEBUG
printf("stat %b error %b\n", stat,
WDCS_BITS, inb(wdc+wd_error),
WDERR_BITS);
#endif
}
bp->b_flags |= B_ERROR; /* flag the error */
}
} else if ((du->dk_flags & DKFL_QUIET) == 0)
diskerr(bp, "wd", "soft ecc", 0, du->dk_skip,
&du->dk_dd);
}
/*
* If this was a successful read operation, fetch the data.
*/
if (((bp->b_flags & (B_READ | B_ERROR)) == B_READ) &&
wdtab[ctrlr].b_active) {
int chk, dummy;
chk = min(DEV_BSIZE / sizeof(short), du->dk_bc / sizeof(short));
/* ready to receive data? */
if (wait_for_drq(wdc, ctrlr) == -1) {
/* XXXX abort here? */
wdstart(ctrlr);
printf("wdc%d: timeout in wdintr WDCS_DRQ\n", ctrlr);
}
/* suck in data */
insw(wdc+wd_data,
(int)bp->b_un.b_addr + du->dk_skip * DEV_BSIZE, chk);
du->dk_bc -= chk * sizeof(short);
du->dk_bct -= chk * sizeof(short);
/* for obselete fractional sector reads */
while (chk++ < (DEV_BSIZE / sizeof(short)))
insw(wdc+wd_data, &dummy, 1);
}
wdxfer[du->dk_lunit]++;
outt:
if (wdtab[ctrlr].b_active) {
#ifdef INSTRUMENT
if (du->dk_unit >= 0)
dk_busy &= ~(1 << du->dk_unit);
#endif
if ((bp->b_flags & B_ERROR) == 0) {
du->dk_skip++; /* Add to succ. sect */
du->dk_skipm++; /* Add to succ. sect for multitransfer */
if (wdtab[ctrlr].b_errcnt &&
(du->dk_flags & DKFL_QUIET) == 0)
diskerr(bp, "wd", "soft error", 0, du->dk_skip,
&du->dk_dd);
wdtab[ctrlr].b_errcnt = 0;
wdtab[ctrlr].b_active = 0;
/* see if more to transfer */
if (du->dk_bc > 0 && (du->dk_flags & DKFL_ERROR) == 0) {
wdstart(ctrlr);
return; /* next chunk is started */
} else if ((du->dk_flags & (DKFL_SINGLE | DKFL_ERROR)) == DKFL_ERROR) {
du->dk_skip = 0;
du->dk_skipm = 0;
du->dk_flags &= ~DKFL_ERROR;
du->dk_flags |= DKFL_SINGLE;
wdstart(ctrlr);
return; /* redo xfer sector by sector */
}
}
done:
/* done with this transfer, with or without error */
du->dk_flags &= ~DKFL_SINGLE;
wdtab[ctrlr].b_errcnt = 0;
du->dk_skip = 0;
if (du->dk_bct == 0) {
wdtab[ctrlr].b_actf = dp->b_forw;
du->dk_skipm = 0;
dp->b_active = 0;
}
dp->b_actf = bp->b_actf;
dp->b_errcnt = 0;
bp->b_resid = bp->b_bcount - du->dk_skip * DEV_BSIZE;
bp->b_flags &= ~B_XXX;
biodone(bp);
}
wdtab[ctrlr].b_active = 0;
/* anything more on drive queue? */
if (dp->b_actf && du->dk_bct == 0)
wdustart(du);
/* anything more for controller to do? */
if (wdtab[ctrlr].b_actf)
wdstart(ctrlr);
}
/*
* Initialize a drive.
*/
int
wdopen(dev_t dev, int flags, int fmt, struct proc *p)
{
register unsigned int lunit;
register struct disk *du;
int part = wdpart(dev), mask = 1 << part;
struct partition *pp;
char *msg;
lunit = wdunit(dev);
if (lunit >= NWD)
return ENXIO;
du = wddrives[lunit];
if (du == 0)
return ENXIO;
#ifdef QUIETWORKS
if (part == WDRAW)
du->dk_flags |= DKFL_QUIET;
else
du->dk_flags &= ~DKFL_QUIET;
#else
du->dk_flags &= ~DKFL_QUIET;
#endif
if ((du->dk_flags & DKFL_BSDLABEL) == 0) {
du->dk_flags |= DKFL_WRITEPROT;
wdutab[lunit].b_actf = NULL;
/*
* Use the default sizes until we've read the label,
* or longer if there isn't one there.
*/
bzero(&du->dk_dd, sizeof(du->dk_dd));
du->dk_dd.d_type = DTYPE_ST506;
du->dk_dd.d_ncylinders = 1024;
du->dk_dd.d_secsize = DEV_BSIZE;
du->dk_dd.d_ntracks = 8;
du->dk_dd.d_nsectors = 17;
du->dk_dd.d_secpercyl = 17*8;
du->dk_dd.d_secperunit = 17*8*1024;
du->dk_state = WANTOPEN;
/* read label using "raw" partition */
#if defined(TIHMODS) && defined(garbage)
/* wdsetctlr(dev, du); */ /* Maybe do this TIH */
msg = readdisklabel(makewddev(major(dev), wdunit(dev), WDRAW),
wdstrategy, &du->dk_dd, &du->dk_cpd);
wdsetctlr(dev, du);
#endif
if (msg = readdisklabel(makewddev(major(dev), wdunit(dev),
WDRAW), wdstrategy, &du->dk_dd, &du->dk_cpd)) {
if ((du->dk_flags & DKFL_QUIET) == 0) {
log(LOG_WARNING,
"wd%d: cannot find label (%s)\n",
lunit, msg);
return EINVAL; /* XXX needs translation */
}
} else {
wdsetctlr(dev, du);
du->dk_flags |= DKFL_BSDLABEL;
du->dk_flags &= ~DKFL_WRITEPROT;
if (du->dk_dd.d_flags & D_BADSECT)
du->dk_flags |= DKFL_BADSECT;
}
}
if (du->dk_flags & DKFL_BADSECT)
bad144intern(du);
/*
* Warn if a partion is opened
* that overlaps another partition which is open
* unless one is the "raw" partition (whole disk).
*/
if ((du->dk_openpart & mask) == 0 && part != WDRAW) {
int start, end;
pp = &du->dk_dd.d_partitions[part];
start = pp->p_offset;
end = pp->p_offset + pp->p_size;
for (pp = du->dk_dd.d_partitions;
pp < &du->dk_dd.d_partitions[du->dk_dd.d_npartitions];
pp++) {
if (pp->p_offset + pp->p_size <= start ||
pp->p_offset >= end)
continue;
if (pp - du->dk_dd.d_partitions == WDRAW)
continue;
if (du->dk_openpart & (1 << (pp - du->dk_dd.d_partitions)))
log(LOG_WARNING,
"wd%d%c: overlaps open partition (%c)\n",
lunit, part + 'a',
pp - du->dk_dd.d_partitions + 'a');
}
}
if (part >= du->dk_dd.d_npartitions && part != WDRAW)
return ENXIO;
/* insure only one open at a time */
du->dk_openpart |= mask;
switch (fmt) {
case S_IFCHR:
du->dk_copenpart |= mask;
break;
case S_IFBLK:
du->dk_bopenpart |= mask;
break;
}
return 0;
}
/*
* Implement operations other than read/write.
* Called from wdstart or wdintr during opens and formats.
* Uses finite-state-machine to track progress of operation in progress.
* Returns 0 if operation still in progress, 1 if completed.
*/
static int
wdcontrol(register struct buf *bp)
{
register struct disk *du;
register unit, lunit;
unsigned char stat;
int s, ctrlr;
int wdc;
du = wddrives[wdunit(bp->b_dev)];
ctrlr = du->dk_ctrlr;
unit = du->dk_unit;
lunit = du->dk_lunit;
wdc = du->dk_port;
switch (du->dk_state) {
case WANTOPEN: /* set SDH, step rate, do restore */
tryagainrecal:
#ifdef WDDEBUG
printf("wd%d: recal ", lunit);
#endif
s = splbio(); /* not called from intr level ... */
wdgetctlr(unit, du);
if (wait_for_ready(wdc, ctrlr) == -1) {
wdreset(ctrlr, wdc, 1);
goto tryagainrecal;
}
outb(wdc+wd_sdh, WDSD_IBM | (unit << 4));
wdtab[ctrlr].b_active = 1;
outb(wdc+wd_command, WDCC_RESTORE | WD_STEP);
if (wait_for_ready(wdc, ctrlr) == -1) {
wdreset(ctrlr, wdc, 1);
goto tryagainrecal;
}
du->dk_state = RECAL;
splx(s);
return 0;
case RECAL:
if ((stat = inb(wdc+wd_status)) & WDCS_ERR) {
if ((du->dk_flags & DKFL_QUIET) == 0) {
printf("wd%d: recal", du->dk_lunit);
printf(": status %b error %b\n", stat,
WDCS_BITS, inb(wdc+wd_error), WDERR_BITS);
}
if (++wdtab[ctrlr].b_errcnt < WDIORETRIES)
goto tryagainrecal;
bp->b_error = ENXIO; /* XXX needs translation */
goto badopen;
}
/* some controllers require this ... */
wdsetctlr(bp->b_dev, du);
wdtab[ctrlr].b_errcnt = 0;
du->dk_state = OPEN;
/*
* The rest of the initialization can be done
* by normal means.
*/
return 1;
default:
panic("wdcontrol");
}
/* NOTREACHED */
badopen:
if ((du->dk_flags & DKFL_QUIET) == 0)
printf(": status %b error %b\n", stat, WDCS_BITS,
inb(wdc+wd_error), WDERR_BITS);
bp->b_flags |= B_ERROR;
return 1;
}
/*
* send a command and wait uninterruptibly until controller is finished.
* return -1 if controller busy for too long, otherwise
* return status. intended for brief controller commands at critical points.
* assumes interrupts are blocked.
*/
static int
wdcommand(struct disk *du, int cmd)
{
int timeout, stat, wdc;
/*DELAY(2000);*/
wdc = du->dk_port;
/* controller ready for command? */
if (wait_for_unbusy(wdc, du->dk_ctrlr) == -1)
return -1;
/* send command, await results */
outb(wdc+wd_command, cmd);
stat = wait_for_unbusy(wdc, du->dk_ctrlr);
if (stat == -1)
return -1;
if (cmd != WDCC_READP)
return stat;
/* is controller ready to return data? */
return wdc_wait(wdc+wd_status, du->dk_ctrlr, 0, WDCS_ERR | WDCS_DRQ);
}
/*
* issue IDC to drive to tell it just what geometry it is to be.
*/
static int
wdsetctlr(dev_t dev, struct disk *du)
{
int stat, x, wdc;
#ifdef WDDEBUG
printf("wd(%d,%d) C%dH%dS%d\n", du->dk_ctrlr, du->dk_unit,
du->dk_dd.d_ncylinders, du->dk_dd.d_ntracks, du->dk_dd.d_nsectors);
#endif
wdc = du->dk_port;
x = splbio();
outb(wdc+wd_cyl_lo, du->dk_dd.d_ncylinders); /* TIH: was ...ders+1 */
outb(wdc+wd_cyl_hi, du->dk_dd.d_ncylinders>>8); /* TIH: was ...ders+1 */
outb(wdc+wd_sdh,
WDSD_IBM | (du->dk_unit << 4) + du->dk_dd.d_ntracks - 1);
outb(wdc+wd_seccnt, du->dk_dd.d_nsectors);
stat = wdcommand(du, WDCC_IDC);
if (stat & WDCS_ERR)
printf("wdsetctlr: stat %b error %b\n", stat, WDCS_BITS,
inb(wdc+wd_error), WDERR_BITS);
splx(x);
return stat;
}
/*
* issue READP to drive to ask it what it is.
*/
static int
wdgetctlr(int u, struct disk *du)
{
int stat, x, i, wdc;
char tb[DEV_BSIZE];
struct wdparams *wp;
x = splbio(); /* not called from intr level ... */
wdc = du->dk_port;
if (wait_for_unbusy(wdc, du->dk_ctrlr) == -1) {
splx(x);
return -1;
}
outb(wdc+wd_sdh, WDSD_IBM | (u << 4));
if (wait_for_ready(wdc, du->dk_ctrlr) == -1) {
splx(x);
return -1;
}
stat = wdcommand(du, WDCC_READP);
if (wait_for_ready(wdc, du->dk_ctrlr) == -1) {
splx(x);
return -1;
}
if (stat < 0) {
splx(x);
return stat;
}
if ((stat & WDCS_ERR) == 0) {
/* obtain parameters */
wp = &du->dk_params;
insw(wdc+wd_data, tb, sizeof(tb)/sizeof(short));
bcopy(tb, wp, sizeof(struct wdparams));
/* shuffle string byte order */
for (i = 0; i < sizeof(wp->wdp_model); i += 2) {
u_short *p;
p = (u_short *)(wp->wdp_model + i);
*p = ntohs(*p);
}
strncpy(du->dk_dd.d_typename, "ESDI/IDE",
sizeof du->dk_dd.d_typename);
du->dk_dd.d_type = DTYPE_ESDI;
bcopy(wp->wdp_model+20, du->dk_dd.d_packname, 14-1);
/* update disklabel given drive information */
du->dk_dd.d_ncylinders =
wp->wdp_fixedcyl + wp->wdp_removcyl /*+- 1*/;
du->dk_dd.d_ntracks = wp->wdp_heads;
du->dk_dd.d_nsectors = wp->wdp_sectors;
du->dk_dd.d_secpercyl =
du->dk_dd.d_ntracks * du->dk_dd.d_nsectors;
du->dk_dd.d_partitions[1].p_size =
du->dk_dd.d_secpercyl * wp->wdp_sectors;
du->dk_dd.d_partitions[1].p_offset = 0;
} else {
/*
* If WDCC_READP fails then we might have an old drive
* so we try a seek to 0; if that passes then the
* drive is there but it's OLD AND KRUSTY.
*/
stat = wdcommand(du, WDCC_RESTORE | WD_STEP);
if (stat & WDCS_ERR) {
splx(x);
return inb(wdc+wd_error);
}
strncpy(du->dk_dd.d_typename, "ST506",
sizeof du->dk_dd.d_typename);
strncpy(du->dk_params.wdp_model, "Unknown Type",
sizeof du->dk_params.wdp_model);
du->dk_dd.d_type = DTYPE_ST506;
}
#if 0
printf("gc %x cyl %d trk %d sec %d type %d sz %d model %s\n",
wp->wdp_config, wp->wdp_fixedcyl + wp->wdp_removcyl, wp->wdp_heads,
wp->wdp_sectors, wp->wdp_cntype, wp->wdp_cnsbsz, wp->wdp_model);
#endif
/* better ... */
du->dk_dd.d_subtype |= DSTYPE_GEOMETRY;
/* XXX sometimes possibly needed */
(void) inb(wdc+wd_status);
splx(x);
return 0;
}
/* ARGSUSED */
int
wdclose(dev_t dev, int flags, int fmt)
{
register struct disk *du;
int part = wdpart(dev), mask = 1 << part;
du = wddrives[wdunit(dev)];
/* insure only one open at a time */
du->dk_openpart &= ~mask;
switch (fmt) {
case S_IFCHR:
du->dk_copenpart &= ~mask;
break;
case S_IFBLK:
du->dk_bopenpart &= ~mask;
break;
}
return 0;
}
int
wdioctl(dev_t dev, int cmd, caddr_t addr, int flag, struct proc *p)
{
int lunit = wdunit(dev);
register struct disk *du;
int error = 0;
struct uio auio;
struct iovec aiov;
du = wddrives[lunit];
switch (cmd) {
case DIOCSBAD:
if ((flag & FWRITE) == 0)
error = EBADF;
else {
du->dk_cpd.bad = *(struct dkbad *)addr;
bad144intern(du);
}
break;
case DIOCGDINFO:
*(struct disklabel *)addr = du->dk_dd;
break;
case DIOCGPART:
((struct partinfo *)addr)->disklab = &du->dk_dd;
((struct partinfo *)addr)->part =
&du->dk_dd.d_partitions[wdpart(dev)];
break;
case DIOCSDINFO:
if ((flag & FWRITE) == 0)
error = EBADF;
else {
error = setdisklabel(&du->dk_dd, (struct disklabel *)addr,
/*(du->dk_flags & DKFL_BSDLABEL) ? du->dk_openpart : */0,
&du->dk_cpd);
}
if (error == 0) {
du->dk_flags |= DKFL_BSDLABEL;
wdsetctlr(dev, du);
}
break;
case DIOCWLABEL:
du->dk_flags &= ~DKFL_WRITEPROT;
if ((flag & FWRITE) == 0)
error = EBADF;
else
du->dk_wlabel = *(int *)addr;
break;
case DIOCWDINFO:
du->dk_flags &= ~DKFL_WRITEPROT;
if ((flag & FWRITE) == 0)
error = EBADF;
else if ((error = setdisklabel(&du->dk_dd,
(struct disklabel *)addr,
/*(du->dk_flags & DKFL_BSDLABEL) ? du->dk_openpart :*/0,
&du->dk_cpd)) == 0) {
int wlab;
du->dk_flags |= DKFL_BSDLABEL;
wdsetctlr(dev, du);
/* simulate opening partition 0 so write succeeds */
du->dk_openpart |= (1 << 0); /* XXX */
wlab = du->dk_wlabel;
du->dk_wlabel = 1;
error = writedisklabel(dev, wdstrategy, &du->dk_dd, &du->dk_cpd);
du->dk_openpart = du->dk_copenpart | du->dk_bopenpart;
du->dk_wlabel = wlab;
}
break;
#ifdef notyet
case DIOCGDINFOP:
*(struct disklabel **)addr = &du->dk_dd;
break;
case DIOCWFORMAT:
if ((flag & FWRITE) == 0)
error = EBADF;
else {
register struct format_op *fop;
fop = (struct format_op *)addr;
aiov.iov_base = fop->df_buf;
aiov.iov_len = fop->df_count;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_resid = fop->df_count;
auio.uio_segflg = 0;
auio.uio_offset =
fop->df_startblk * du->dk_dd.d_secsize;
error = physio(wdformat, &rwdbuf[lunit], dev, B_WRITE,
minphys, &auio);
fop->df_count -= auio.uio_resid;
fop->df_reg[0] = du->dk_status;
fop->df_reg[1] = du->dk_error;
}
break;
#endif
default:
error = ENOTTY;
break;
}
return error;
}
#ifdef B_FORMAT
int
wdformat(struct buf *bp)
{
bp->b_flags |= B_FORMAT;
return wdstrategy(bp);
}
#endif
int
wdsize(dev_t dev)
{
int lunit = wdunit(dev), part = wdpart(dev);
struct disk *du;
if (lunit >= NWD)
return -1;
du = wddrives[lunit];
if (du == 0)
return -1;
if (du->dk_state < OPEN || (du->dk_flags & DKFL_BSDLABEL) == 0) {
int val;
val = wdopen(makewddev(major(dev), lunit, WDRAW), FREAD,
S_IFBLK, 0);
if (val != 0)
return -1;
}
if ((du->dk_flags & (DKFL_WRITEPROT | DKFL_BSDLABEL)) != DKFL_BSDLABEL)
return -1;
return (int)du->dk_dd.d_partitions[part].p_size;
}
extern char *vmmap; /* poor name! */
/* dump core after a system crash */
int
wddump(dev_t dev)
{
register struct disk *du; /* disk unit to do the IO */
long num; /* number of sectors to write */
int ctrlr, lunit, part, wdc;
long blkoff, blknum;
long cylin, head, sector, stat;
long secpertrk, secpercyl, nblocks, i;
char *addr;
static wddoingadump = 0;
extern caddr_t CADDR1;
extern struct pte *CMAP1;
addr = (char *)0; /* starting address */
#if DO_NOT_KNOW_HOW
/* toss any characters present prior to dump, ie. non-blocking getc */
while (cngetc())
;
#endif
/* size of memory to dump */
lunit = wdunit(dev);
part = wdpart(dev); /* file system */
/* check for acceptable drive number */
if (lunit >= NWD)
return ENXIO;
du = wddrives[lunit];
/* was it ever initialized ? */
if (du == 0 || du->dk_state < OPEN || du->dk_flags & DKFL_WRITEPROT)
return ENXIO;
wdc = du->dk_port;
ctrlr = du->dk_ctrlr;
/* Convert to disk sectors */
num = ctob(physmem) / du->dk_dd.d_secsize;
/* check if controller active */
/*if (wdtab[ctrlr].b_active)
return EFAULT;*/
if (wddoingadump)
return EFAULT;
secpertrk = du->dk_dd.d_nsectors;
secpercyl = du->dk_dd.d_secpercyl;
nblocks = du->dk_dd.d_partitions[part].p_size;
blkoff = du->dk_dd.d_partitions[part].p_offset;
/*pg("xunit %x, nblocks %d, dumplo %d num %d\n", part, nblocks, dumplo,
num);*/
/* check transfer bounds against partition size */
if (dumplo < 0 || dumplo + num > nblocks)
return EINVAL;
/* mark controller active for if we panic during the dump */
/*wdtab[ctrlr].b_active = 1;*/
wddoingadump = 1;
i = 200000000;
while ((inb(wdc+wd_status) & WDCS_BUSY) && (i-- > 0))
;
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit << 4));
outb(wdc+wd_command, WDCC_RESTORE | WD_STEP);
while (inb(wdc+wd_status) & WDCS_BUSY)
;
/* some compaq controllers require this ... */
wdsetctlr(dev, du);
blknum = dumplo + blkoff;
while (num > 0) {
/* compute disk address */
cylin = blknum / secpercyl;
head = (blknum % secpercyl) / secpertrk;
sector = blknum % secpertrk;
if (du->dk_flags & DKFL_BADSECT) {
long newblk;
int i;
for (i = 0; du->dk_badsect[i] != -1; i++) {
if (blknum < du->dk_badsect[i]) {
/* sorted list, passed our block by */
break;
} else if (blknum == du->dk_badsect[i]) {
newblk = du->dk_dd.d_secperunit -
du->dk_dd.d_nsectors - i - 1;
cylin = newblk / secpercyl;
head = (newblk % secpercyl) / secpertrk;
sector = newblk % secpertrk;
/* found and replaced; done */
break;
}
}
}
sector++; /* origin 1 */
/* select drive. */
outb(wdc+wd_sdh, WDSD_IBM | (du->dk_unit << 4) | (head & 0xf));
while ((inb(wdc+wd_status) & WDCS_READY) == 0)
;
/* transfer some blocks */
outb(wdc+wd_sector, sector);
outb(wdc+wd_seccnt, 1);
outb(wdc+wd_cyl_lo, cylin);
outb(wdc+wd_cyl_hi, cylin >> 8);
#ifdef notdef
/* lets just talk about this first...*/
pg("sdh 0%o sector %d cyl %d addr 0x%x", inb(wdc+wd_sdh),
inb(wdc+wd_sector),
(inb(wdc+wd_cyl_hi) << 8) + inb(wdc+wd_cyl_lo), addr);
#endif
outb(wdc+wd_command, WDCC_WRITE);
#ifdef notdef /* cannot use this since this address was mapped differently */
pmap_enter(kernel_pmap, CADDR1, trunc_page(addr), VM_PROT_READ, TRUE);
#else
*(int *)CMAP1 = PG_V | PG_KW | ctob((long)addr);
tlbflush();
#endif
/* Ready to send data? */
while ((inb(wdc+wd_status) & WDCS_DRQ) == 0)
;
if (inb(wdc+wd_status) & WDCS_ERR)
return EIO;
outsw(wdc+wd_data, CADDR1 + ((int)addr & PGOFSET),
DEV_BSIZE / 2);
if (inb(wdc+wd_status) & WDCS_ERR)
return EIO;
/* Check data request (should be done). */
if (inb(wdc+wd_status) & WDCS_DRQ)
return EIO;
/* wait for completion */
for (i = 200000000; inb(wdc+wd_status) & WDCS_BUSY; i--) {
if (i < 0)
return EIO;
}
/* error check the xfer */
if (inb(wdc+wd_status) & WDCS_ERR)
return EIO;
if ((unsigned)addr % 1048576 == 0)
printf("%d ", num / (1048576 / DEV_BSIZE));
/* update block count */
num--;
blknum++;
(int)addr += DEV_BSIZE;
#if DO_NOT_KNOW_HOW
/* operator aborting dump? non-blocking getc() */
if (cngetc())
return EINTR;
#endif
}
return 0;
}
/*
* Internalize the bad sector table.
*/
void
bad144intern(struct disk *du)
{
int i;
if (du->dk_flags & DKFL_BADSECT) {
for (i = 0; i < 127; i++)
du->dk_badsect[i] = -1;
for (i = 0; i < 126; i++) {
if (du->dk_cpd.bad.bt_bad[i].bt_cyl == 0xffff)
break;
du->dk_badsect[i] =
du->dk_cpd.bad.bt_bad[i].bt_cyl *
du->dk_dd.d_secpercyl +
(du->dk_cpd.bad.bt_bad[i].bt_trksec >> 8) *
du->dk_dd.d_nsectors +
(du->dk_cpd.bad.bt_bad[i].bt_trksec & 0x00ff);
}
}
}
static int
wdreset(int ctrlr, int wdc, int err)
{
int stat;
if (err)
printf("wdc%d: busy too long, resetting\n", ctrlr);
/* reset the device */
outb(wdc+wd_ctlr, WDCTL_RST | WDCTL_IDS);
DELAY(1000);
outb(wdc+wd_ctlr, WDCTL_4BIT);
if (wait_for_unbusy(wdc, ctrlr) == -1)
printf("wdc%d: failed to reset controller\n", ctrlr);
}
int
wdc_wait(port, ctrlr, on, off)
int port, ctrlr;
int on, off;
{
int timeout = 0;
int stat;
for (;;) {
stat = inb(port);
if ((stat & on) != on || (stat & off) != 0)
break;
DELAY(WDCDELAY);
if (++timeout > WDCNDELAY)
return -1;
}
#ifdef WDCNDELAY_DEBUG
if (timeout > WDCNDELAY_DEBUG)
printf("wdc%d: timeout took %dus\n", ctrlr, WDCDELAY * timeout);
#endif
return stat;
}
static int
wdtimeout(caddr_t arg)
{
int x = splbio();
register int unit = (int)arg;
if (wdtimeoutstatus[unit] && --wdtimeoutstatus[unit] == 0) {
struct disk *du = wddrives[unit];
int wdc = du->dk_port;
printf("wd%d: lost interrupt - status %x, error %x\n",
unit, inb(wdc+wd_status), inb(wdc+wd_error));
outb(wdc+wd_ctlr, WDCTL_RST | WDCTL_IDS);
DELAY(1000);
outb(wdc+wd_ctlr, WDCTL_IDS);
DELAY(1000);
(void) inb(wdc+wd_error);
outb(wdc+wd_ctlr, WDCTL_4BIT);
du->dk_skip = 0;
du->dk_flags |= DKFL_SINGLE;
wdstart(du->dk_ctrlr); /* start controller */
}
timeout((timeout_t)wdtimeout, (caddr_t)unit, hz/2);
splx(x);
return 0;
}
#endif /* NWDC > 0 */
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