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Synchronize with sys/i386/isa/isa.c revision 1.103.

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This commit is contained in:
KATO Takenori 1997-08-28 09:15:31 +00:00
parent ef5ccd9e3c
commit 0bce7b8410
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=28860
1 changed files with 45 additions and 14 deletions
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59
sys/pc98/pc98/pc98.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)isa.c 7.2 (Berkeley) 5/13/91
* $Id: pc98.c,v 1.38 1997/08/21 08:24:19 kato Exp $
* $Id: pc98.c,v 1.39 1997/08/26 15:08:52 kato Exp $
*/
/*
@ -601,6 +601,7 @@ static u_int dma_bouncebufsize[8];
static u_int8_t dma_bounced = 0;
static u_int8_t dma_busy = 0; /* Used in isa_dmastart() */
static u_int8_t dma_inuse = 0; /* User for acquire/release */
static u_int8_t dma_auto_mode = 0;
#ifdef PC98
#define VALID_DMA_MASK (3)
@ -670,6 +671,7 @@ isa_dma_acquire(chan)
return (EBUSY);
}
dma_inuse |= (1 << chan);
dma_auto_mode &= ~(1 << chan);
return (0);
}
@ -701,6 +703,7 @@ isa_dma_release(chan)
}
dma_inuse &= ~(1 << chan);
dma_auto_mode &= ~(1 << chan);
}
#ifndef PC98
@ -777,6 +780,12 @@ void isa_dmastart(int flags, caddr_t addr, u_int nbytes, int chan)
/* translate to physical */
phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr);
if (flags & B_RAW) {
dma_auto_mode |= (1 << chan);
} else {
dma_auto_mode &= ~(1 << chan);
}
if (need_pre_dma_flush)
wbinvd(); /* wbinvd (WB cache flush) */
@ -871,15 +880,10 @@ void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan)
printf("isa_dmadone: channel %d not acquired\n", chan);
#endif
#if 0
/*
* XXX This should be checked, but drivers like ad1848 only call
* isa_dmastart() once because they use Auto DMA mode. If we
* leave this in, drivers that do this will print this continuously.
*/
if ((dma_busy & (1 << chan)) == 0)
if (((dma_busy & (1 << chan)) == 0) &&
(dma_auto_mode & (1 << chan)) == 0 )
printf("isa_dmadone: channel %d not busy\n", chan);
#endif
if (dma_bounced & (1 << chan)) {
/* copy bounce buffer on read */
@ -972,12 +976,14 @@ isa_dmastatus(int chan)
printf("isa_dmastatus: channel %d not active\n", chan);
return(-1);
}
/* channel busy? */
if (((dma_busy & (1 << chan)) == 0) &&
(dma_auto_mode & (1 << chan)) == 0 ) {
printf("chan %d not busy\n", chan);
return -2 ;
}
/* still busy? */
if ((dma_busy & (1 << chan)) == 0) {
return(0);
}
#ifdef PC98
ffport = DMA1_FFC;
waport = DMA1_CHN(chan) + 2;
@ -1015,6 +1021,31 @@ isa_dmastatus(int chan)
return(cnt);
}
/*
* Stop a DMA transfer currently in progress.
*/
int
isa_dmastop(int chan)
{
if ((dma_inuse & (1 << chan)) == 0)
printf("isa_dmastop: channel %d not acquired\n", chan);
if (((dma_busy & (1 << chan)) == 0) &&
((dma_auto_mode & (1 << chan)) == 0)) {
printf("chan %d not busy\n", chan);
return -2 ;
}
if ((chan & 4) == 0) {
outb(DMA1_SMSK, (chan & 3) | 4 /* disable mask */);
} else {
#ifndef PC98
outb(DMA2_SMSK, (chan & 3) | 4 /* disable mask */);
#endif
}
return(isa_dmastatus(chan));
}
/*
* Find the highest priority enabled display device. Since we can't
* distinguish display devices from ttys, depend on display devices