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added 5us delay before checking BUSY flag to conform to ATA spec -

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as suggested by John Dyson (dyson@implode.rain.com)
This commit is contained in:
David Greenman 1993-11-19 06:30:00 +00:00
parent 437c34ef5b
commit d333677271
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=787
1 changed files with 17 additions and 2 deletions
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19
sys/i386/isa/wd.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)wd.c 7.2 (Berkeley) 5/9/91
* $Id: wd.c,v 1.12 1993/11/17 23:25:20 wollman Exp $
* $Id: wd.c,v 1.13 1993/11/18 05:02:22 rgrimes Exp $
*/
/* TODO:peel out buffer at low ipl, speed improvement */
@ -446,6 +446,8 @@ wdstart()
/* controller idle? */
timeout = 0;
/* must delay 5us to conform to ATA spec */
DELAY(5);
while (inb(wdc+wd_status) & WDCS_BUSY)
{
if (++timeout > WDCTIMEOUT)
@ -573,7 +575,8 @@ wdintr(struct intrframe wdif)
#ifdef WDDEBUG
printf("I ");
#endif
/* must delay 5us to conform to ATA spec */
DELAY(5);
while ((status = inb(wdc+wd_status)) & WDCS_BUSY) ;
/* is it not a transfer, but a control operation? */
@ -834,6 +837,8 @@ wdcontrol(register struct buf *bp)
outb(wdc+wd_sdh, WDSD_IBM | (unit << 4));
wdtab.b_active = 1;
/* must delay 5us to conform to ATA spec */
DELAY(5);
/* wait for drive and controller to become ready */
for (i = WDCTIMEOUT; (inb(wdc+wd_status) & (WDCS_READY|WDCS_BUSY))
!= WDCS_READY && i-- != 0; )
@ -891,6 +896,8 @@ wdcommand(struct disk *du, int cmd) {
/* controller ready for command? */
wdc = du->dk_port;
/* must delay 5us to conform to ATA spec */
DELAY(5);
while (((stat = inb(wdc + wd_status)) & WDCS_BUSY) && timeout > 0)
timeout--;
if (timeout <= 0)
@ -898,6 +905,8 @@ wdcommand(struct disk *du, int cmd) {
/* send command, await results */
outb(wdc+wd_command, cmd);
/* must delay 5us to conform to ATA spec */
DELAY(5);
while (((stat = inb(wdc+wd_status)) & WDCS_BUSY) && timeout > 0)
timeout--;
if (timeout <= 0)
@ -1238,9 +1247,13 @@ wddump(dev_t dev) /* dump core after a system crash */
/*wdtab.b_active = 1;*/ /* mark controller active for if we
panic during the dump */
wddoingadump = 1 ; i = 100000 ;
/* must delay 5us to conform to ATA spec */
DELAY(5);
while ((inb(wdc+wd_status) & WDCS_BUSY) && (i-- > 0)) ;
outb(wdc+wd_sdh, WDSD_IBM | (unit << 4));
outb(wdc+wd_command, WDCC_RESTORE | WD_STEP);
/* must delay 5us to conform to ATA spec */
DELAY(5);
while (inb(wdc+wd_status) & WDCS_BUSY) ;
/* some compaq controllers require this ... */
@ -1320,6 +1333,8 @@ wddump(dev_t dev) /* dump core after a system crash */
if (inb(wdc+wd_status) & WDCS_DRQ) return(EIO) ;
/* wait for completion */
/* must delay 5us to conform to ATA spec */
DELAY(5);
for ( i = WDCTIMEOUT ; inb(wdc+wd_status) & WDCS_BUSY ; i--) {
if (i < 0) return (EIO) ;
}