ASoC: samsung: i2s: Convert to single component with multiple DAIs

This patch includes minimal changes as a prerequisite for adding support
for the Exynos secondary I2S interface as second DAI of the I2S component.
Doing it that way allows to avoid problems as indicated in commmit
6b01e0365b1689 ("ASoC: samsung: i2s: disable secondary DAI until it gets fixed")

The samsung_i2s_get_pri_dai() helper added in this patch is temporary and
will be removed in one of subsequent patches.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/samsung/i2s.c

@@ -34,6 +34,9 @@
 
 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
 
+#define SAMSUNG_I2S_ID_PRIMARY		1
+#define SAMSUNG_I2S_ID_SECONDARY	2
+
 struct samsung_i2s_variant_regs {
 	unsigned int	bfs_off;
 	unsigned int	rfs_off;
@@ -79,8 +82,10 @@ struct i2s_dai {
 #define DAI_OPENED	(1 << 0) /* Dai is opened */
 #define DAI_MANAGER	(1 << 1) /* Dai is the manager */
 	unsigned mode;
+
 	/* Driver for this DAI */
-	struct snd_soc_dai_driver i2s_dai_drv;
+	struct snd_soc_dai_driver *drv;
+
 	/* DMA parameters */
 	struct snd_dmaengine_dai_dma_data dma_playback;
 	struct snd_dmaengine_dai_dma_data dma_capture;
@@ -92,8 +97,6 @@ struct i2s_dai {
 	u32	suspend_i2spsr;
 	const struct samsung_i2s_variant_regs *variant_regs;
 
-	/* Spinlock protecting access to the device's registers */
-	spinlock_t spinlock;
 	spinlock_t *lock;
 
 	/* Below fields are only valid if this is the primary FIFO */
@@ -104,10 +107,29 @@ struct i2s_dai {
 /* Lock for cross i/f checks */
 static DEFINE_SPINLOCK(lock);
 
-/* If this is the 'overlay' stereo DAI */
+struct samsung_i2s_priv {
+	struct platform_device *pdev;
+
+	/* Spinlock protecting access to the device's registers */
+	spinlock_t spinlock;
+
+	/* CPU DAIs and their corresponding drivers */
+	struct i2s_dai *dai;
+	struct snd_soc_dai_driver *dai_drv;
+	int num_dais;
+};
+
+struct i2s_dai *samsung_i2s_get_pri_dai(struct device *dev)
+{
+	struct samsung_i2s_priv *priv = dev_get_drvdata(dev);
+
+	return &priv->dai[SAMSUNG_I2S_ID_PRIMARY - 1];
+}
+
+/* Returns true if this is the 'overlay' stereo DAI */
 static inline bool is_secondary(struct i2s_dai *i2s)
 {
-	return i2s->pri_dai ? true : false;
+	return i2s->drv->id == SAMSUNG_I2S_ID_SECONDARY;
 }
 
 /* If operating in SoC-Slave mode */
@@ -202,7 +224,9 @@ static inline bool any_active(struct i2s_dai *i2s)
 
 static inline struct i2s_dai *to_info(struct snd_soc_dai *dai)
 {
-	return snd_soc_dai_get_drvdata(dai);
+	struct samsung_i2s_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+	return &priv->dai[dai->id - 1];
 }
 
 static inline bool is_opened(struct i2s_dai *i2s)
@@ -1059,7 +1083,7 @@ static int samsung_i2s_dai_probe(struct snd_soc_dai *dai)
 
 static int samsung_i2s_dai_remove(struct snd_soc_dai *dai)
 {
-	struct i2s_dai *i2s = snd_soc_dai_get_drvdata(dai);
+	struct i2s_dai *i2s = to_info(dai);
 	unsigned long flags;
 
 	pm_runtime_get_sync(dai->dev);
@@ -1096,47 +1120,63 @@ static const struct snd_soc_component_driver samsung_i2s_component = {
 					SNDRV_PCM_FMTBIT_S16_LE | \
 					SNDRV_PCM_FMTBIT_S24_LE)
 
-static struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev,
+static int i2s_alloc_dais(struct samsung_i2s_priv *priv,
 			  const struct samsung_i2s_dai_data *i2s_dai_data,
-				bool sec)
+			  int num_dais)
 {
-	struct i2s_dai *i2s;
-
-	i2s = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dai), GFP_KERNEL);
-	if (i2s == NULL)
-		return NULL;
-
-	i2s->pdev = pdev;
-	i2s->pri_dai = NULL;
-	i2s->sec_dai = NULL;
-	i2s->i2s_dai_drv.id = 1;
-	i2s->i2s_dai_drv.symmetric_rates = 1;
-	i2s->i2s_dai_drv.probe = samsung_i2s_dai_probe;
-	i2s->i2s_dai_drv.remove = samsung_i2s_dai_remove;
-	i2s->i2s_dai_drv.ops = &samsung_i2s_dai_ops;
-	i2s->i2s_dai_drv.suspend = i2s_suspend;
-	i2s->i2s_dai_drv.resume = i2s_resume;
-	i2s->i2s_dai_drv.playback.channels_min = 1;
-	i2s->i2s_dai_drv.playback.channels_max = 2;
-	i2s->i2s_dai_drv.playback.rates = i2s_dai_data->pcm_rates;
-	i2s->i2s_dai_drv.playback.formats = SAMSUNG_I2S_FMTS;
-
-	if (!sec) {
-		i2s->i2s_dai_drv.name = SAMSUNG_I2S_DAI;
-		i2s->i2s_dai_drv.capture.channels_min = 1;
-		i2s->i2s_dai_drv.capture.channels_max = 2;
-		i2s->i2s_dai_drv.capture.rates = i2s_dai_data->pcm_rates;
-		i2s->i2s_dai_drv.capture.formats = SAMSUNG_I2S_FMTS;
-	} else {
-		i2s->i2s_dai_drv.name = SAMSUNG_I2S_DAI_SEC;
+	static const char *dai_names[] = { "samsung-i2s", "samsung-i2s-sec" };
+	struct snd_soc_dai_driver *dai_drv;
+	struct i2s_dai *dai;
+	int i;
+
+	priv->dai = devm_kcalloc(&priv->pdev->dev, num_dais,
+				     sizeof(*dai), GFP_KERNEL);
+	if (!priv->dai)
+		return -ENOMEM;
+
+	priv->dai_drv = devm_kcalloc(&priv->pdev->dev, num_dais,
+				     sizeof(*dai_drv), GFP_KERNEL);
+	if (!priv->dai_drv)
+		return -ENOMEM;
+
+	for (i = 0; i < num_dais; i++) {
+		dai_drv = &priv->dai_drv[i];
+
+		dai_drv->probe = samsung_i2s_dai_probe;
+		dai_drv->remove = samsung_i2s_dai_remove;
+		dai_drv->suspend = i2s_suspend;
+		dai_drv->resume = i2s_resume;
+
+		dai_drv->symmetric_rates = 1;
+		dai_drv->ops = &samsung_i2s_dai_ops;
+
+		dai_drv->playback.channels_min = 1;
+		dai_drv->playback.channels_max = 2;
+		dai_drv->playback.rates = i2s_dai_data->pcm_rates;
+		dai_drv->playback.formats = SAMSUNG_I2S_FMTS;
+
+		dai_drv->id = i + 1;
+		dai_drv->name = dai_names[i];
+
+		priv->dai[i].drv = &priv->dai_drv[i];
+		priv->dai[i].pdev = priv->pdev;
 	}
-	return i2s;
+
+	/* Initialize capture only for the primary DAI */
+	dai_drv = &priv->dai_drv[SAMSUNG_I2S_ID_PRIMARY - 1];
+
+	dai_drv->capture.channels_min = 1;
+	dai_drv->capture.channels_max = 2;
+	dai_drv->capture.rates = i2s_dai_data->pcm_rates;
+	dai_drv->capture.formats = SAMSUNG_I2S_FMTS;
+
+	return 0;
 }
 
 #ifdef CONFIG_PM
 static int i2s_runtime_suspend(struct device *dev)
 {
-	struct i2s_dai *i2s = dev_get_drvdata(dev);
+	struct i2s_dai *i2s = samsung_i2s_get_pri_dai(dev);
 
 	i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
 	i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
@@ -1151,7 +1191,7 @@ static int i2s_runtime_suspend(struct device *dev)
 
 static int i2s_runtime_resume(struct device *dev)
 {
-	struct i2s_dai *i2s = dev_get_drvdata(dev);
+	struct i2s_dai *i2s = samsung_i2s_get_pri_dai(dev);
 	int ret;
 
 	ret = clk_prepare_enable(i2s->clk);
@@ -1186,7 +1226,7 @@ static void i2s_unregister_clocks(struct i2s_dai *i2s)
 
 static void i2s_unregister_clock_provider(struct platform_device *pdev)
 {
-	struct i2s_dai *i2s = dev_get_drvdata(&pdev->dev);
+	struct i2s_dai *i2s = samsung_i2s_get_pri_dai(&pdev->dev);
 
 	of_clk_del_provider(pdev->dev.of_node);
 	i2s_unregister_clocks(i2s);
@@ -1194,11 +1234,12 @@ static void i2s_unregister_clock_provider(struct platform_device *pdev)
 
 static int i2s_register_clock_provider(struct platform_device *pdev)
 {
+
 	const char * const i2s_clk_desc[] = { "cdclk", "rclk_src", "prescaler" };
 	const char *clk_name[2] = { "i2s_opclk0", "i2s_opclk1" };
 	const char *p_names[2] = { NULL };
 	struct device *dev = &pdev->dev;
-	struct i2s_dai *i2s = dev_get_drvdata(dev);
+	struct i2s_dai *i2s = samsung_i2s_get_pri_dai(dev);
 	const struct samsung_i2s_variant_regs *reg_info = i2s->variant_regs;
 	const char *i2s_clk_name[ARRAY_SIZE(i2s_clk_desc)];
 	struct clk *rclksrc;
@@ -1273,7 +1314,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 	u32 regs_base, quirks = 0, idma_addr = 0;
 	struct device_node *np = pdev->dev.of_node;
 	const struct samsung_i2s_dai_data *i2s_dai_data;
-	int ret;
+	int num_dais, ret;
+	struct samsung_i2s_priv *priv;
 
 	if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node)
 		i2s_dai_data = of_device_get_match_data(&pdev->dev);
@@ -1281,14 +1323,24 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 		i2s_dai_data = (struct samsung_i2s_dai_data *)
 				platform_get_device_id(pdev)->driver_data;
 
-	pri_dai = i2s_alloc_dai(pdev, i2s_dai_data, false);
-	if (!pri_dai) {
-		dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
 		return -ENOMEM;
-	}
 
-	spin_lock_init(&pri_dai->spinlock);
-	pri_dai->lock = &pri_dai->spinlock;
+	quirks = np ? i2s_dai_data->quirks : i2s_pdata->type.quirks;
+	quirks &= ~(QUIRK_SEC_DAI | QUIRK_SUPPORTS_IDMA);
+
+	num_dais = (quirks & QUIRK_SEC_DAI) ? 2 : 1;
+	priv->pdev = pdev;
+
+	ret = i2s_alloc_dais(priv, i2s_dai_data, num_dais);
+	if (ret < 0)
+		return ret;
+
+	pri_dai = &priv->dai[SAMSUNG_I2S_ID_PRIMARY - 1];
+
+	spin_lock_init(&priv->spinlock);
+	pri_dai->lock = &priv->spinlock;
 
 	if (!np) {
 		if (i2s_pdata == NULL) {
@@ -1300,10 +1352,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 		pri_dai->dma_capture.filter_data = i2s_pdata->dma_capture;
 		pri_dai->filter = i2s_pdata->dma_filter;
 
-		quirks = i2s_pdata->type.quirks;
 		idma_addr = i2s_pdata->type.idma_addr;
 	} else {
-		quirks = i2s_dai_data->quirks;
 		if (of_property_read_u32(np, "samsung,idma-addr",
 					 &idma_addr)) {
 			if (quirks & QUIRK_SUPPORTS_IDMA) {
@@ -1312,7 +1362,6 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 			}
 		}
 	}
-	quirks &= ~(QUIRK_SEC_DAI | QUIRK_SUPPORTS_IDMA);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	pri_dai->addr = devm_ioremap_resource(&pdev->dev, res);
@@ -1342,28 +1391,17 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 	pri_dai->variant_regs = i2s_dai_data->i2s_variant_regs;
 
 	if (quirks & QUIRK_PRI_6CHAN)
-		pri_dai->i2s_dai_drv.playback.channels_max = 6;
+		pri_dai->drv->playback.channels_max = 6;
 
 	ret = samsung_asoc_dma_platform_register(&pdev->dev, pri_dai->filter,
 						 NULL, NULL, NULL);
 	if (ret < 0)
 		goto err_disable_clk;
 
-	ret = devm_snd_soc_register_component(&pdev->dev,
-					&samsung_i2s_component,
-					&pri_dai->i2s_dai_drv, 1);
-	if (ret < 0)
-		goto err_disable_clk;
-
 	if (quirks & QUIRK_SEC_DAI) {
-		sec_dai = i2s_alloc_dai(pdev, i2s_dai_data, true);
-		if (!sec_dai) {
-			dev_err(&pdev->dev, "Unable to alloc I2S_sec\n");
-			ret = -ENOMEM;
-			goto err_disable_clk;
-		}
+		sec_dai = &priv->dai[SAMSUNG_I2S_ID_SECONDARY - 1];
 
-		sec_dai->lock = &pri_dai->spinlock;
+		sec_dai->lock = &priv->spinlock;
 		sec_dai->variant_regs = pri_dai->variant_regs;
 		sec_dai->dma_playback.addr = regs_base + I2STXDS;
 		sec_dai->dma_playback.chan_name = "tx-sec";
@@ -1386,11 +1424,6 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 		if (ret < 0)
 			goto err_disable_clk;
 
-		ret = devm_snd_soc_register_component(&pdev->dev,
-						&samsung_i2s_component,
-						&sec_dai->i2s_dai_drv, 1);
-		if (ret < 0)
-			goto err_disable_clk;
 	}
 
 	if (i2s_pdata && i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
@@ -1399,7 +1432,13 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 		goto err_disable_clk;
 	}
 
-	dev_set_drvdata(&pdev->dev, pri_dai);
+	dev_set_drvdata(&pdev->dev, priv);
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+					&samsung_i2s_component,
+					priv->dai_drv, num_dais);
+	if (ret < 0)
+		goto err_disable_clk;
 
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
@@ -1421,9 +1460,8 @@ static int samsung_i2s_probe(struct platform_device *pdev)
 
 static int samsung_i2s_remove(struct platform_device *pdev)
 {
-	struct i2s_dai *pri_dai;
-
-	pri_dai = dev_get_drvdata(&pdev->dev);
+	struct samsung_i2s_priv *priv = dev_get_drvdata(&pdev->dev);
+	struct i2s_dai *pri_dai = samsung_i2s_get_pri_dai(&pdev->dev);
 
 	pm_runtime_get_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);