static inline int kirkwood_set_rate(struct kirkwood_dma_data* priv,
unsigned long rate)
{
int ret = -EINVAL;
/* First check if ext clk is available */
if (!IS_ERR(priv->extclk)) {
/* use optional external clk for other rates */
printk (">>> %s :: extclk set rate = %lu -> %lu\n",
__FUNCTION__, rate, 256*rate);
ret = clk_set_rate(priv->extclk, 256*rate);
if (!ret) writel(KIRKWOOD_MCLK_SOURCE_EXTCLK,
priv->io+KIRKWOOD_CLOCKS_CTRL);
}
if (ret && (rate == 44100 || rate == 48000 || rate == 96000)) {
/* use internal dco for supported rates */
printk (">>> %s :: dco set rate = %lu\n",
__FUNCTION__, rate);
ret = kirkwood_set_dco(priv->io, rate);
if (!ret) writel(KIRKWOOD_MCLK_SOURCE_DCO,
priv->io+KIRKWOOD_CLOCKS_CTRL);
}
return ret;
}
static void kirkwood_set_rate(struct snd_soc_dai *dai,
struct kirkwood_dma_data *priv, unsigned long rate)
{
uint32_t clks_ctrl;
if (IS_ERR(priv->extclk)) {
/* use internal dco for the supported rates
* defined in kirkwood_i2s_dai */
dev_dbg(dai->dev, "%s: dco set rate = %lu\n",
__func__, rate);
kirkwood_set_dco(priv->io, rate);
clks_ctrl = KIRKWOOD_MCLK_SOURCE_DCO;
} else {
/* use the external clock for the other rates
* defined in kirkwood_i2s_dai_extclk */
dev_dbg(dai->dev, "%s: extclk set rate = %lu -> %lu\n",
__func__, rate, 256 * rate);
clk_set_rate(priv->extclk, 256 * rate);
clks_ctrl = KIRKWOOD_MCLK_SOURCE_EXTCLK;
}
writel(clks_ctrl, priv->io + KIRKWOOD_CLOCKS_CTRL);
}
static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
unsigned int i2s_reg, reg;
unsigned long i2s_value, value;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_reg = KIRKWOOD_I2S_PLAYCTL;
reg = KIRKWOOD_PLAYCTL;
} else {
i2s_reg = KIRKWOOD_I2S_RECCTL;
reg = KIRKWOOD_RECCTL;
}
/* set dco conf */
kirkwood_set_dco(priv->io, params_rate(params));
i2s_value = readl(priv->io+i2s_reg);
i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
value = readl(priv->io+reg);
value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;
/*
* Size settings in play/rec i2s control regs and play/rec control
* regs must be the same.
*/
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
break;
/*
* doesn't work... S20_3LE != kirkwood 20bit format ?
*
case SNDRV_PCM_FORMAT_S20_3LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
value |= KIRKWOOD_PLAYCTL_SIZE_20;
break;
*/
case SNDRV_PCM_FORMAT_S24_LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
value |= KIRKWOOD_PLAYCTL_SIZE_24;
break;
case SNDRV_PCM_FORMAT_S32_LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
value |= KIRKWOOD_PLAYCTL_SIZE_32;
break;
default:
return -EINVAL;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
if (params_channels(params) == 1)
value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
else
value |= KIRKWOOD_PLAYCTL_MONO_OFF;
}
writel(i2s_value, priv->io+i2s_reg);
writel(value, priv->io+reg);
return 0;
}
