ASoC: amd: acp: Add TDM support for acp i2s stream

Add callback and code changes to enable ACP I2S controller in TDM
mode. Add new fields in acp_stream and acp_dev_data struct to configure
tdm related registers for ACP i2s controllers.
Signed-off-by: Venkata Prasad Potturu <venkataprasad.potturu@amd.com>
Link: https://lore.kernel.org/r/20220810132913.1181247-3-venkataprasad.potturu@amd.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/acp/acp-i2s.c

@@ -25,6 +25,65 @@
 
 #define DRV_NAME "acp_i2s_playcap"
 
+static int acp_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
+			   unsigned int fmt)
+{
+	struct acp_dev_data *adata = snd_soc_dai_get_drvdata(cpu_dai);
+	int mode;
+
+	mode = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
+	switch (mode) {
+	case SND_SOC_DAIFMT_I2S:
+		adata->tdm_mode = TDM_DISABLE;
+		break;
+	case SND_SOC_DAIFMT_DSP_A:
+		adata->tdm_mode = TDM_ENABLE;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int acp_i2s_set_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask, u32 rx_mask,
+				int slots, int slot_width)
+{
+	struct device *dev = dai->component->dev;
+	struct acp_dev_data *adata = snd_soc_dai_get_drvdata(dai);
+	struct acp_stream *stream;
+	int slot_len;
+
+	switch (slot_width) {
+	case SLOT_WIDTH_8:
+		slot_len = 8;
+		break;
+	case SLOT_WIDTH_16:
+		slot_len = 16;
+		break;
+	case SLOT_WIDTH_24:
+		slot_len = 24;
+		break;
+	case SLOT_WIDTH_32:
+		slot_len = 0;
+		break;
+	default:
+		dev_err(dev, "Unsupported bitdepth %d\n", slot_width);
+		return -EINVAL;
+	}
+
+	spin_lock_irq(&adata->acp_lock);
+	list_for_each_entry(stream, &adata->stream_list, list) {
+		if (tx_mask && stream->dir == SNDRV_PCM_STREAM_PLAYBACK)
+			adata->tdm_tx_fmt[stream->dai_id - 1] =
+					FRM_LEN | (slots << 15) | (slot_len << 18);
+		else if (rx_mask && stream->dir == SNDRV_PCM_STREAM_CAPTURE)
+			adata->tdm_rx_fmt[stream->dai_id - 1] =
+					FRM_LEN | (slots << 15) | (slot_len << 18);
+	}
+	spin_unlock_irq(&adata->acp_lock);
+	return 0;
+}
+
 static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params,
 			    struct snd_soc_dai *dai)
 {
@@ -33,7 +92,7 @@ static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_
 	struct acp_resource *rsrc;
 	u32 val;
 	u32 xfer_resolution;
-	u32 reg_val;
+	u32 reg_val, fmt_reg, tdm_fmt;
 	u32 lrclk_div_val, bclk_div_val;
 
 	adata = snd_soc_dai_get_drvdata(dai);
@@ -62,12 +121,15 @@ static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_
 		switch (dai->driver->id) {
 		case I2S_BT_INSTANCE:
 			reg_val = ACP_BTTDM_ITER;
+			fmt_reg = ACP_BTTDM_TXFRMT;
 			break;
 		case I2S_SP_INSTANCE:
 			reg_val = ACP_I2STDM_ITER;
+			fmt_reg = ACP_I2STDM_TXFRMT;
 			break;
 		case I2S_HS_INSTANCE:
 			reg_val = ACP_HSTDM_ITER;
+			fmt_reg = ACP_HSTDM_TXFRMT;
 			break;
 		default:
 			dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
@@ -77,12 +139,15 @@ static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_
 		switch (dai->driver->id) {
 		case I2S_BT_INSTANCE:
 			reg_val = ACP_BTTDM_IRER;
+			fmt_reg = ACP_BTTDM_RXFRMT;
 			break;
 		case I2S_SP_INSTANCE:
 			reg_val = ACP_I2STDM_IRER;
+			fmt_reg = ACP_I2STDM_RXFRMT;
 			break;
 		case I2S_HS_INSTANCE:
 			reg_val = ACP_HSTDM_IRER;
+			fmt_reg = ACP_HSTDM_RXFRMT;
 			break;
 		default:
 			dev_err(dev, "Invalid dai id %x\n", dai->driver->id);
@@ -95,6 +160,16 @@ static int acp_i2s_hwparams(struct snd_pcm_substream *substream, struct snd_pcm_
 	val = val | (xfer_resolution  << 3);
 	writel(val, adata->acp_base + reg_val);
 
+	if (adata->tdm_mode) {
+		val = readl(adata->acp_base + reg_val);
+		writel(val | BIT(1), adata->acp_base + reg_val);
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			tdm_fmt = adata->tdm_tx_fmt[dai->driver->id - 1];
+		else
+			tdm_fmt = adata->tdm_rx_fmt[dai->driver->id - 1];
+		writel(tdm_fmt, adata->acp_base + fmt_reg);
+	}
+
 	if (rsrc->soc_mclk) {
 		switch (params_format(params)) {
 		case SNDRV_PCM_FORMAT_S16_LE:
@@ -443,6 +518,7 @@ static int acp_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_d
 	stream->id = dai->driver->id + dir;
 	stream->dai_id = dai->driver->id;
 	stream->irq_bit = irq_bit;
+	stream->dir = substream->stream;
 
 	return 0;
 }
@@ -452,6 +528,8 @@ const struct snd_soc_dai_ops asoc_acp_cpu_dai_ops = {
 	.hw_params = acp_i2s_hwparams,
 	.prepare = acp_i2s_prepare,
 	.trigger = acp_i2s_trigger,
+	.set_fmt = acp_i2s_set_fmt,
+	.set_tdm_slot = acp_i2s_set_tdm_slot,
 };
 EXPORT_SYMBOL_NS_GPL(asoc_acp_cpu_dai_ops, SND_SOC_ACP_COMMON);
 

sound/soc/amd/acp/amd.h

@@ -84,6 +84,14 @@
 
 #define ACP_MAX_STREAM			8
 
+#define TDM_ENABLE	1
+#define TDM_DISABLE	0
+
+#define SLOT_WIDTH_8	0x8
+#define SLOT_WIDTH_16	0x10
+#define SLOT_WIDTH_24	0x18
+#define SLOT_WIDTH_32	0x20
+
 struct acp_chip_info {
 	char *name;		/* Platform name */
 	unsigned int acp_rev;	/* ACP Revision id */
@@ -96,6 +104,7 @@ struct acp_stream {
 	int irq_bit;
 	int dai_id;
 	int id;
+	int dir;
 	u64 bytescount;
 	u32 reg_offset;
 	u32 pte_offset;
@@ -120,6 +129,7 @@ struct acp_dev_data {
 	void __iomem *acp_base;
 	unsigned int i2s_irq;
 
+	bool tdm_mode;
 	/* SOC specific dais */
 	struct snd_soc_dai_driver *dai_driver;
 	int num_dai;
@@ -134,6 +144,8 @@ struct acp_dev_data {
 	u32 lrclk_div;
 
 	struct acp_resource *rsrc;
+	u32 tdm_tx_fmt[3];
+	u32 tdm_rx_fmt[3];
 };
 
 union acp_i2stdm_mstrclkgen {