static void
ad1816_intr(void *arg)
{
struct ad1816_info *ad1816 = (struct ad1816_info *)arg;
unsigned char c, served = 0;
ad1816_lock(ad1816);
/* get interrupt status */
c = io_rd(ad1816, AD1816_INT);
/* check for stray interrupts */
if (c & ~(AD1816_INTRCI | AD1816_INTRPI)) {
printf("pcm: stray int (%x)\n", c);
c &= AD1816_INTRCI | AD1816_INTRPI;
}
/* check for capture interrupt */
if (sndbuf_runsz(ad1816->rch.buffer) && (c & AD1816_INTRCI)) {
ad1816_unlock(ad1816);
chn_intr(ad1816->rch.channel);
ad1816_lock(ad1816);
served |= AD1816_INTRCI; /* cp served */
}
/* check for playback interrupt */
if (sndbuf_runsz(ad1816->pch.buffer) && (c & AD1816_INTRPI)) {
ad1816_unlock(ad1816);
chn_intr(ad1816->pch.channel);
ad1816_lock(ad1816);
served |= AD1816_INTRPI; /* pb served */
}
if (served == 0) {
/* this probably means this is not a (working) ad1816 chip, */
/* or an error in dma handling */
printf("pcm: int without reason (%x)\n", c);
c = 0;
} else c &= ~served;
io_wr(ad1816, AD1816_INT, c);
c = io_rd(ad1816, AD1816_INT);
if (c != 0) printf("pcm: int clear failed (%x)\n", c);
ad1816_unlock(ad1816);
}
int
sndbuf_dmaptr(struct snd_dbuf *b)
{
int i;
KASSERT(b, ("sndbuf_dmaptr called with b == NULL"));
KASSERT(sndbuf_getflags(b) & SNDBUF_F_DMA, ("sndbuf_dmaptr called on non-ISA buffer"));
if (!sndbuf_runsz(b))
return 0;
i = isa_dmastatus(b->dmachan);
KASSERT(i >= 0, ("isa_dmastatus returned %d", i));
return b->bufsize - i;
}