ASoC: samsung: i2s: add support for FSD I2S

Add support for enabling I2S controller on FSD platform.

FSD I2S controller is based on Exynos7 I2S controller, supporting
2CH playback/capture in I2S mode and 7.1CH playback/capture in TDM
mode.

Signed-off-by: Padmanabhan Rajanbabu <p.rajanbabu@samsung.com>
Link: https://lore.kernel.org/r/20230116103823.90757-3-p.rajanbabu@samsung.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/i2s-regs.h

@@ -132,6 +132,7 @@
 #define EXYNOS7_MOD_RCLK_192FS	7
 
 #define PSR_PSREN		(1 << 15)
+#define PSR_PSVAL(x)		((((x) - 1) << 8) & 0x3f00)
 
 #define FIC_TX2COUNT(x)		(((x) >>  24) & 0xf)
 #define FIC_TX1COUNT(x)		(((x) >>  16) & 0xf)

sound/soc/samsung/i2s.c

@@ -50,6 +50,10 @@ struct samsung_i2s_dai_data {
 	u32 quirks;
 	unsigned int pcm_rates;
 	const struct samsung_i2s_variant_regs *i2s_variant_regs;
+	void (*fixup_early)(struct snd_pcm_substream *substream,
+					struct snd_soc_dai *dai);
+	void (*fixup_late)(struct snd_pcm_substream *substream,
+					struct snd_soc_dai *dai);
 };
 
 struct i2s_dai {
@@ -111,6 +115,10 @@ struct samsung_i2s_priv {
 	u32 suspend_i2spsr;
 
 	const struct samsung_i2s_variant_regs *variant_regs;
+	void (*fixup_early)(struct snd_pcm_substream *substream,
+						struct snd_soc_dai *dai);
+	void (*fixup_late)(struct snd_pcm_substream *substream,
+						struct snd_soc_dai *dai);
 	u32 quirks;
 
 	/* The clock provider's data */
@@ -940,6 +948,10 @@ static int i2s_trigger(struct snd_pcm_substream *substream,
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		pm_runtime_get_sync(dai->dev);
+
+		if (priv->fixup_early)
+			priv->fixup_early(substream, dai);
+
 		spin_lock_irqsave(&priv->lock, flags);
 
 		if (config_setup(i2s)) {
@@ -947,6 +959,9 @@ static int i2s_trigger(struct snd_pcm_substream *substream,
 			return -EINVAL;
 		}
 
+		if (priv->fixup_late)
+			priv->fixup_late(substream, dai);
+
 		if (capture)
 			i2s_rxctrl(i2s, 1);
 		else
@@ -1410,6 +1425,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 
 	if (np) {
 		priv->quirks = i2s_dai_data->quirks;
+		priv->fixup_early = i2s_dai_data->fixup_early;
+		priv->fixup_late = i2s_dai_data->fixup_late;
 	} else {
 		if (!i2s_pdata) {
 			dev_err(&pdev->dev, "Missing platform data\n");
@@ -1563,6 +1580,31 @@ static int samsung_i2s_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void fsd_i2s_fixup_early(struct snd_pcm_substream *substream,
+		struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct i2s_dai *i2s = to_info(asoc_rtd_to_cpu(rtd, 0));
+	struct i2s_dai *other = get_other_dai(i2s);
+
+	if (!is_opened(other)) {
+		i2s_set_sysclk(dai, SAMSUNG_I2S_CDCLK, 0, SND_SOC_CLOCK_OUT);
+		i2s_set_sysclk(dai, SAMSUNG_I2S_OPCLK, 0, MOD_OPCLK_PCLK);
+	}
+}
+
+static void fsd_i2s_fixup_late(struct snd_pcm_substream *substream,
+		struct snd_soc_dai *dai)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct samsung_i2s_priv *priv = snd_soc_dai_get_drvdata(dai);
+	struct i2s_dai *i2s = to_info(asoc_rtd_to_cpu(rtd, 0));
+	struct i2s_dai *other = get_other_dai(i2s);
+
+	if (!is_opened(other))
+		writel(PSR_PSVAL(2) | PSR_PSREN, priv->addr + I2SPSR);
+}
+
 static const struct samsung_i2s_variant_regs i2sv3_regs = {
 	.bfs_off = 1,
 	.rfs_off = 3,
@@ -1652,6 +1694,14 @@ static const struct samsung_i2s_dai_data i2sv5_dai_type_i2s1 __maybe_unused = {
 	.i2s_variant_regs = &i2sv5_i2s1_regs,
 };
 
+static const struct samsung_i2s_dai_data fsd_dai_type __maybe_unused = {
+	.quirks = QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR | QUIRK_SUPPORTS_TDM,
+	.pcm_rates = SNDRV_PCM_RATE_8000_192000,
+	.i2s_variant_regs = &i2sv7_regs,
+	.fixup_early = fsd_i2s_fixup_early,
+	.fixup_late = fsd_i2s_fixup_late,
+};
+
 static const struct platform_device_id samsung_i2s_driver_ids[] = {
 	{
 		.name           = "samsung-i2s",
@@ -1678,6 +1728,9 @@ static const struct of_device_id exynos_i2s_match[] = {
 	}, {
 		.compatible = "samsung,exynos7-i2s1",
 		.data = &i2sv5_dai_type_i2s1,
+	}, {
+		.compatible = "tesla,fsd-i2s",
+		.data = &fsd_dai_type,
 	},
 	{},
 };