void snd_init()
{
unsigned int codec_id;
unsigned int mask;
snd_cr_request = 0;
snd_cr_reply = 0;
CSR_AC97_DCTL = 0;
CSR_AC97_UCTL = 0;
mask = irq_getmask();
mask |= IRQ_AC97CRREQUEST|IRQ_AC97CRREPLY|IRQ_AC97DMAR|IRQ_AC97DMAW;
irq_setmask(mask);
codec_id = snd_ac97_read(0x00);
if(codec_id == 0x0d50)
printf("SND: found LM4550 AC'97 codec\n");
else
printf("SND: warning, unknown codec found (ID:%04x)\n", codec_id);
/* Unmute and set volumes */
/* TODO: API for this */
snd_ac97_write(0x02, 0x0000);
snd_ac97_write(0x04, 0x0f0f);
snd_ac97_write(0x18, 0x0000);
snd_ac97_write(0x0e, 0x0000);
snd_ac97_write(0x1c, 0x0f0f);
snd_play_empty();
snd_record_empty();
printf("SND: initialization complete\n");
}
void snd_init()
{
unsigned int codec_id;
unsigned int mask;
if(!(CSR_CAPABILITIES & CAP_AC97)) {
printf("SND: not supported by SoC, giving up.\n");
return;
}
snd_cr_request = 0;
snd_cr_reply = 0;
/* Reset AC'97 controller */
CSR_AC97_CRCTL = 0;
CSR_AC97_DCTL = 0;
CSR_AC97_UCTL = 0;
irq_ack(IRQ_AC97CRREQUEST|IRQ_AC97CRREPLY|IRQ_AC97DMAR|IRQ_AC97DMAW);
mask = irq_getmask();
mask |= IRQ_AC97CRREQUEST|IRQ_AC97CRREPLY|IRQ_AC97DMAR|IRQ_AC97DMAW;
irq_setmask(mask);
codec_id = snd_ac97_read(0x00);
if(codec_id == 0x0d50)
printf("SND: found LM4550 AC'97 codec\n");
else if(codec_id == 0x6150)
printf("SND: found WM9707 AC'97 codec\n");
else
printf("SND: warning, unknown codec found (ID:%04x)\n", codec_id);
/* Unmute and set volumes */
/* TODO: API for this */
snd_ac97_write(0x02, 0x0000); /* master volume */
snd_ac97_write(0x04, 0x0f0f); /* headphones volume */
snd_ac97_write(0x18, 0x0000); /* PCM out volume */
snd_ac97_write(0x1c, 0x0f0f); /* record gain */
snd_ac97_write(0x0e, 0x0000); /* mic volume: max */
snd_ac97_write(0x10, 0x0000); /* line in volume: max */
snd_ac97_write(0x1a, 0x0505); /* record select: stero mix */
snd_play_empty();
snd_record_empty();
printf("SND: initialization complete\n");
}