/*
* get the current pointer on via686
*/
static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
unsigned int idx, ptr, count, res;
if (snd_BUG_ON(!viadev->tbl_entries))
return 0;
if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
return 0;
spin_lock(&chip->reg_lock);
count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
/* The via686a does not have the current index register,
* so we need to calculate the index from CURR_PTR.
*/
ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
if (ptr <= (unsigned int)viadev->table.addr)
idx = 0;
else /* CURR_PTR holds the address + 8 */
idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) %
viadev->tbl_entries;
res = calc_linear_pos(viadev, idx, count);
spin_unlock(&chip->reg_lock);
return bytes_to_frames(substream->runtime, res);
}
static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
{
struct via82xx_modem *chip = dev_id;
unsigned int status;
unsigned int i;
status = inl(VIAREG(chip, SGD_SHADOW));
if (! (status & chip->intr_mask)) {
return IRQ_NONE;
}
// _skip_sgd:
/* check status for each stream */
spin_lock(&chip->reg_lock);
for (i = 0; i < chip->num_devs; i++) {
struct viadev *viadev = &chip->devs[i];
unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
if (! c_status)
continue;
if (viadev->substream && viadev->running) {
spin_unlock(&chip->reg_lock);
snd_pcm_period_elapsed(viadev->substream);
spin_lock(&chip->reg_lock);
}
outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
}
spin_unlock(&chip->reg_lock);
return IRQ_HANDLED;
}
static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
{
outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
VIADEV_REG(viadev, OFFSET_CONTROL));
inb(VIADEV_REG(viadev, OFFSET_CONTROL));
udelay(50);
/* disable interrupts */
outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
/* clear interrupts */
outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
// outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
viadev->lastpos = 0;
}
static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
{
outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
VIADEV_REG(viadev, OFFSET_CONTROL));
inb(VIADEV_REG(viadev, OFFSET_CONTROL));
udelay(50);
/* */
outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
/* */
outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* */
//
viadev->lastpos = 0;
}
/*
* set up the table pointer
*/
static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
{
snd_via82xx_codec_ready(chip, chip->ac97_secondary);
outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
udelay(20);
snd_via82xx_codec_ready(chip, chip->ac97_secondary);
}
/*
* trigger callback
*/
static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
unsigned char val = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_SUSPEND:
val |= VIA_REG_CTRL_START;
viadev->running = 1;
break;
case SNDRV_PCM_TRIGGER_STOP:
val = VIA_REG_CTRL_TERMINATE;
viadev->running = 0;
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
val |= VIA_REG_CTRL_PAUSE;
viadev->running = 0;
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
viadev->running = 1;
break;
default:
return -EINVAL;
}
outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
if (cmd == SNDRV_PCM_TRIGGER_STOP)
snd_via82xx_channel_reset(chip, viadev);
return 0;
}
/*
* prepare callback for playback and capture
*/
static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
{
struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
struct viadev *viadev = substream->runtime->private_data;
snd_via82xx_channel_reset(chip, viadev);
/* this must be set after channel_reset */
snd_via82xx_set_table_ptr(chip, viadev);
outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
VIADEV_REG(viadev, OFFSET_TYPE));
return 0;
}
