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slight mods to isa dma and channel flushing code

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This commit is contained in:
Cameron Grant 2000-11-07 00:32:35 +00:00
parent 41b3c72639
commit d19811446d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=68413
1 changed files with 32 additions and 24 deletions
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56
sys/dev/sound/pcm/channel.c
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@ -36,9 +36,11 @@
#define ISA_DMA(b) (((b)->chan >= 0 && (b)->chan != 4 && (b)->chan < 8))
#define CANCHANGE(c) (!(c)->buffer.dl)
#define ROUND(x) ((x) & DMA_ALIGN_MASK)
/*
#define DEB(x) x
*/
static void buf_clear(snd_dbuf *b, u_int32_t fmt, int length);
static void chn_dmaupdate(pcm_channel *c);
static void chn_wrintr(pcm_channel *c);
@ -263,10 +265,9 @@ chn_wrfeed(pcm_channel *c)
bs->fl = 0;
a = 0;
}
/*
printf("b: [rl: %d, rp %d, fl %d, fp %d]; bs: [rl: %d, rp %d, fl %d, fp %d]\n",
b->rl, b->rp, b->fl, b->fp, bs->rl, bs->rp, bs->fl, bs->fp);
*/
DEB(if (c->flags & CHN_F_CLOSING)
printf("b: [rl: %d, rp %d, fl %d, fp %d]; bs: [rl: %d, rp %d, fl %d, fp %d]\n",
b->rl, b->rp, b->fl, b->fp, bs->rl, bs->rp, bs->fl, bs->fp));
/* Don't allow write unaligned data */
while (bs->rl > a && b->fl > a) {
/* ensure we always have a whole number of samples */
@ -939,22 +940,25 @@ chn_resetbuf(pcm_channel *c)
void
buf_isadma(snd_dbuf *b, int go)
{
if (ISA_DMA(b)) {
switch (go) {
case PCMTRIG_START:
DEB(printf("buf 0x%p ISA DMA started\n", b));
isa_dmastart(b->dir | ISADMA_RAW, b->buf,
b->bufsize, b->chan);
break;
case PCMTRIG_STOP:
case PCMTRIG_ABORT:
DEB(printf("buf 0x%p ISA DMA stopped\n", b));
isa_dmastop(b->chan);
isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize,
b->chan);
break;
}
} else KASSERT(1, ("buf_isadma called on invalid channel"));
KASSERT(b, ("buf_isadma called with b == NULL"));
KASSERT(ISA_DMA(b), ("buf_isadma called on non-ISA channel"));
switch (go) {
case PCMTRIG_START:
isa_dmastart(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->chan);
break;
case PCMTRIG_STOP:
case PCMTRIG_ABORT:
isa_dmastop(b->chan);
isa_dmadone(b->dir | ISADMA_RAW, b->buf, b->bufsize, b->chan);
break;
}
DEB(printf("buf 0x%p ISA DMA %s, channel %d\n",
b,
(go == PCMTRIG_START)? "started" : "stopped",
b->chan));
}
int
@ -1071,11 +1075,15 @@ chn_flush(pcm_channel *c)
snd_dbuf *bs = &c->buffer2nd;
DEB(printf("chn_flush c->flags 0x%08x\n", c->flags));
if (!b->dl)
return 0;
c->flags |= CHN_F_CLOSING;
if (c->direction == PCMDIR_REC)
chn_abort(c);
else if (b->dl) {
resid_p = resid = b->rl + bs->rl;
else {
resid = b->rl + bs->rl;
resid_p = resid;
count = 10;
while ((count > 0) && (resid > 0) && !b->underflow) {
/* still pending output data. */
@ -1087,7 +1095,7 @@ chn_flush(pcm_channel *c)
s = spltty();
chn_dmaupdate(c);
splx(s);
DEB(printf("chn_flush: now rl = %d, fl = %d\n", b->rl, b->fl));
DEB(printf("chn_flush: now rl = %d, fl = %d, resid = %d\n", b->rl, b->fl, resid));
resid = b->rl + bs->rl;
if (resid >= resid_p)
count--;
@ -1095,7 +1103,7 @@ chn_flush(pcm_channel *c)
}
if (count == 0)
DEB(printf("chn_flush: timeout flushing dbuf_out, cnt 0x%x flags 0x%x\n", b->rl, c->flags));
if (c->direction == PCMDIR_PLAY && b->dl)
if (b->dl)
chn_abort(c);
}
c->flags &= ~CHN_F_CLOSING;