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ASoC: tlv320aic3x: Add TDM support
TDM support is achieved using DSP transfer mode and setting a programmable offset which specifies where data begins with respect to the frame sync. It requires 256-clock mode if CODEC is master (not currently supported in the driver). No additional dependency if CODEC is slave. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -78,6 +78,8 @@ struct aic3x_priv {
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struct aic3x_disable_nb disable_nb[AIC3X_NUM_SUPPLIES];
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struct aic3x_setup_data *setup;
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unsigned int sysclk;
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unsigned int dai_fmt;
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unsigned int tdm_delay;
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struct list_head list;
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int master;
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int gpio_reset;
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@ -1009,6 +1011,25 @@ found:
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return 0;
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}
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static int aic3x_prepare(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_codec *codec = dai->codec;
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struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
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int delay = 0;
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/* TDM slot selection only valid in DSP_A/_B mode */
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if (aic3x->dai_fmt == SND_SOC_DAIFMT_DSP_A)
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delay += (aic3x->tdm_delay + 1);
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else if (aic3x->dai_fmt == SND_SOC_DAIFMT_DSP_B)
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delay += aic3x->tdm_delay;
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/* Configure data delay */
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snd_soc_write(codec, AIC3X_ASD_INTF_CTRLC, aic3x->tdm_delay);
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return 0;
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}
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static int aic3x_mute(struct snd_soc_dai *dai, int mute)
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{
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struct snd_soc_codec *codec = dai->codec;
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@ -1048,7 +1069,6 @@ static int aic3x_set_dai_fmt(struct snd_soc_dai *codec_dai,
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struct snd_soc_codec *codec = codec_dai->codec;
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struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
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u8 iface_areg, iface_breg;
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int delay = 0;
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iface_areg = snd_soc_read(codec, AIC3X_ASD_INTF_CTRLA) & 0x3f;
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iface_breg = snd_soc_read(codec, AIC3X_ASD_INTF_CTRLB) & 0x3f;
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@ -1076,7 +1096,6 @@ static int aic3x_set_dai_fmt(struct snd_soc_dai *codec_dai,
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case (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF):
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break;
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case (SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_IB_NF):
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delay = 1;
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case (SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_IB_NF):
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iface_breg |= (0x01 << 6);
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break;
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@ -1090,10 +1109,45 @@ static int aic3x_set_dai_fmt(struct snd_soc_dai *codec_dai,
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return -EINVAL;
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}
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aic3x->dai_fmt = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
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/* set iface */
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snd_soc_write(codec, AIC3X_ASD_INTF_CTRLA, iface_areg);
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snd_soc_write(codec, AIC3X_ASD_INTF_CTRLB, iface_breg);
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snd_soc_write(codec, AIC3X_ASD_INTF_CTRLC, delay);
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return 0;
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}
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static int aic3x_set_dai_tdm_slot(struct snd_soc_dai *codec_dai,
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unsigned int tx_mask, unsigned int rx_mask,
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int slots, int slot_width)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct aic3x_priv *aic3x = snd_soc_codec_get_drvdata(codec);
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unsigned int lsb;
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if (tx_mask != rx_mask) {
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dev_err(codec->dev, "tx and rx masks must be symmetric\n");
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return -EINVAL;
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}
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if (unlikely(!tx_mask)) {
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dev_err(codec->dev, "tx and rx masks need to be non 0\n");
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return -EINVAL;
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}
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/* TDM based on DSP mode requires slots to be adjacent */
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lsb = __ffs(tx_mask);
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if ((lsb + 1) != __fls(tx_mask)) {
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dev_err(codec->dev, "Invalid mask, slots must be adjacent\n");
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return -EINVAL;
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}
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aic3x->tdm_delay = lsb * slot_width;
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/* DOUT in high-impedance on inactive bit clocks */
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snd_soc_update_bits(codec, AIC3X_ASD_INTF_CTRLA,
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DOUT_TRISTATE, DOUT_TRISTATE);
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return 0;
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}
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@ -1212,9 +1266,11 @@ static int aic3x_set_bias_level(struct snd_soc_codec *codec,
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static const struct snd_soc_dai_ops aic3x_dai_ops = {
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.hw_params = aic3x_hw_params,
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.prepare = aic3x_prepare,
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.digital_mute = aic3x_mute,
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.set_sysclk = aic3x_set_dai_sysclk,
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.set_fmt = aic3x_set_dai_fmt,
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.set_tdm_slot = aic3x_set_dai_tdm_slot,
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};
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static struct snd_soc_dai_driver aic3x_dai = {
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@ -169,6 +169,7 @@
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/* Audio serial data interface control register A bits */
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#define BIT_CLK_MASTER 0x80
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#define WORD_CLK_MASTER 0x40
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#define DOUT_TRISTATE 0x20
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/* Codec Datapath setup register 7 */
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#define FSREF_44100 (1 << 7)
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