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Adjust data pointers for untransmitted bytes in fifos when there's phase

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change during data transfer.
This commit is contained in:
Luoqi Chen 1999-12-16 16:11:49 +00:00
parent 410605d122
commit da2c318f0b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=54687
1 changed files with 13 additions and 5 deletions
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18
sys/dev/aic/aic.c
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@ -920,7 +920,7 @@ static void
aic_dataout(struct aic_softc *aic)
{
struct aic_scb *scb = aic->nexus;
u_int8_t dmastat, dmacntrl0;
u_int8_t dmastat, dmacntrl0, sstat2;
int n;
CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_dataout\n"));
@ -970,10 +970,19 @@ aic_dataout(struct aic_softc *aic)
for (;;) {
/* wait until all bytes in the fifos are transmitted */
dmastat = aic_inb(aic, DMASTAT);
if (dmastat & INTSTAT)
sstat2 = aic_inb(aic, SSTAT2);
if ((dmastat & DFIFOEMP) && (sstat2 & SEMPTY))
break;
if ((dmastat & DFIFOEMP) && (aic_inb(aic, SSTAT2) & SEMPTY))
if (dmastat & INTSTAT) {
/* adjust for untransmitted bytes */
n = aic_inb(aic, FIFOSTAT) + (sstat2 & 0xf);
scb->data_ptr -= n;
scb->data_len += n;
/* clear the fifo */
aic_outb(aic, SXFRCTL0, CHEN|CLRCH);
aic_outb(aic, DMACNTRL0, RSTFIFO);
break;
}
}
aic_outb(aic, SXFRCTL0, CHEN);
@ -1008,8 +1017,7 @@ aic_cmd(struct aic_softc *aic)
aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
aic_outb(aic, DMACNTRL0, ENDMA|WRITE);
aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
aic_outsw(aic, DMADATA, (u_int16_t *)scb->cmd_ptr,
scb->cmd_len >> 1);
aic_outsw(aic, DMADATA, (u_int16_t *)scb->cmd_ptr, scb->cmd_len >> 1);
while ((aic_inb(aic, SSTAT2) & SEMPTY) == 0 &&
(aic_inb(aic, DMASTAT) & INTSTAT) == 0)
;