static void dw_i2s_config(struct dw_i2s_dev *dev, int stream)
{
u32 ch_reg;
struct i2s_clk_config_data *config = &dev->config;
i2s_disable_channels(dev, stream);
for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_write_reg(dev->i2s_base, TCR(ch_reg),
dev->xfer_resolution);
i2s_write_reg(dev->i2s_base, TFCR(ch_reg),
dev->fifo_th - 1);
i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
} else {
i2s_write_reg(dev->i2s_base, RCR(ch_reg),
dev->xfer_resolution);
i2s_write_reg(dev->i2s_base, RFCR(ch_reg),
dev->fifo_th - 1);
i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
}
}
}
static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
struct i2s_clk_config_data *config = &dev->config;
u32 ccr, xfer_resolution, ch_reg, irq;
int ret;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
config->data_width = 16;
ccr = 0x00;
xfer_resolution = 0x02;
break;
case SNDRV_PCM_FORMAT_S24_LE:
config->data_width = 24;
ccr = 0x08;
xfer_resolution = 0x04;
break;
case SNDRV_PCM_FORMAT_S32_LE:
config->data_width = 32;
ccr = 0x10;
xfer_resolution = 0x05;
break;
default:
dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
return -EINVAL;
}
config->chan_nr = params_channels(params);
switch (config->chan_nr) {
case EIGHT_CHANNEL_SUPPORT:
ch_reg = 3;
break;
case SIX_CHANNEL_SUPPORT:
ch_reg = 2;
break;
case FOUR_CHANNEL_SUPPORT:
ch_reg = 1;
break;
case TWO_CHANNEL_SUPPORT:
ch_reg = 0;
break;
default:
dev_err(dev->dev, "channel not supported\n");
return -EINVAL;
}
i2s_disable_channels(dev, substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
} else {
i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
}
i2s_write_reg(dev->i2s_base, CCR, ccr);
config->sample_rate = params_rate(params);
if (!dev->i2s_clk_cfg)
return -EINVAL;
ret = dev->i2s_clk_cfg(config);
if (ret < 0) {
dev_err(dev->dev, "runtime audio clk config fail\n");
return ret;
}
return 0;
}
