ASoC: sti: Add uniperipheral dai driver

ASoc uniperipheral dai driver that manages uniperipheral DAIs and registers
associated generic dma engine platform.
Signed-off-by: NArnaud Pouliquen <arnaud.pouliquen@st.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

sound/soc/sti/sti_uniperif.c

+/*
+ * Copyright (C) STMicroelectronics SA 2015
+ * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com>
+ *          for STMicroelectronics.
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/module.h>
+
+#include "uniperif.h"
+
+/*
+ * sti_uniperiph_dai_create_ctrl
+ * This function is used to create Ctrl associated to DAI but also pcm device.
+ * Request is done by front end to associate ctrl with pcm device id
+ */
+int sti_uniperiph_dai_create_ctrl(struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct uniperif *uni = priv->dai_data.uni;
+	struct snd_kcontrol_new *ctrl;
+	int i;
+
+	if (!uni->num_ctrls)
+		return 0;
+
+	for (i = 0; i < uni->num_ctrls; i++) {
+		/*
+		 * Several Control can have same name. Controls are indexed on
+		 * Uniperipheral instance ID
+		 */
+		ctrl = &uni->snd_ctrls[i];
+		ctrl->index = uni->info->id;
+		ctrl->device = uni->info->id;
+	}
+
+	return snd_soc_add_dai_controls(dai, uni->snd_ctrls, uni->num_ctrls);
+}
+
+/*
+ * DAI
+ */
+int sti_uniperiph_dai_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params,
+				struct snd_soc_dai *dai)
+{
+	struct snd_dmaengine_dai_dma_data *dma_data;
+	int transfer_size;
+
+	transfer_size = params_channels(params) * UNIPERIF_FIFO_FRAMES;
+
+	dma_data = snd_soc_dai_get_dma_data(dai, substream);
+	dma_data->maxburst = transfer_size;
+
+	return 0;
+}
+
+int sti_uniperiph_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+
+	priv->dai_data.uni->daifmt = fmt;
+
+	return 0;
+}
+
+static int sti_uniperiph_dai_suspend(struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct uniperif *uni = priv->dai_data.uni;
+	int ret;
+
+	/* The uniperipheral should be in stopped state */
+	if (uni->state != UNIPERIF_STATE_STOPPED) {
+		dev_err(uni->dev, "%s: invalid uni state( %d)",
+			__func__, (int)uni->state);
+		return -EBUSY;
+	}
+
+	/* Pinctrl: switch pinstate to sleep */
+	ret = pinctrl_pm_select_sleep_state(uni->dev);
+	if (ret)
+		dev_err(uni->dev, "%s: failed to select pinctrl state",
+			__func__);
+
+	return ret;
+}
+
+static int sti_uniperiph_dai_resume(struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct uniperif *uni = priv->dai_data.uni;
+	int ret;
+
+	if (of_device_is_compatible(dai->dev->of_node, "st,sti-uni-player")) {
+		ret = uni_player_resume(uni);
+		if (ret)
+			return ret;
+	}
+
+	/* pinctrl: switch pinstate to default */
+	ret = pinctrl_pm_select_default_state(uni->dev);
+	if (ret)
+		dev_err(uni->dev, "%s: failed to select pinctrl state",
+			__func__);
+
+	return ret;
+}
+
+static int sti_uniperiph_dai_probe(struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct sti_uniperiph_dai *dai_data = &priv->dai_data;
+
+	/* DMA settings*/
+	if (of_device_is_compatible(dai->dev->of_node, "st,sti-uni-player"))
+		snd_soc_dai_init_dma_data(dai, &dai_data->dma_data, NULL);
+	else
+		snd_soc_dai_init_dma_data(dai, NULL, &dai_data->dma_data);
+
+	dai_data->dma_data.addr = dai_data->uni->fifo_phys_address;
+	dai_data->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+	return sti_uniperiph_dai_create_ctrl(dai);
+}
+
+static const struct snd_soc_dai_driver sti_uniperiph_dai_template = {
+	.probe = sti_uniperiph_dai_probe,
+	.suspend = sti_uniperiph_dai_suspend,
+	.resume = sti_uniperiph_dai_resume
+};
+
+static const struct snd_soc_component_driver sti_uniperiph_dai_component = {
+	.name = "sti_cpu_dai",
+};
+
+static int sti_uniperiph_cpu_dai_of(struct device_node *node,
+				    struct sti_uniperiph_data *priv)
+{
+	const char *str;
+	int ret;
+	struct device *dev = &priv->pdev->dev;
+	struct sti_uniperiph_dai *dai_data = &priv->dai_data;
+	struct snd_soc_dai_driver *dai = priv->dai;
+	struct snd_soc_pcm_stream *stream;
+	struct uniperif *uni;
+
+	uni = devm_kzalloc(dev, sizeof(*uni), GFP_KERNEL);
+	if (!uni)
+		return -ENOMEM;
+
+	*dai = sti_uniperiph_dai_template;
+	ret = of_property_read_string(node, "dai-name", &str);
+	if (ret < 0) {
+		dev_err(dev, "%s: dai name missing.\n", __func__);
+		return -EINVAL;
+	}
+	dai->name = str;
+
+	/* Get resources */
+	uni->mem_region = platform_get_resource(priv->pdev, IORESOURCE_MEM, 0);
+
+	if (!uni->mem_region) {
+		dev_err(dev, "Failed to get memory resource");
+		return -ENODEV;
+	}
+
+	uni->base = devm_ioremap_resource(dev, uni->mem_region);
+
+	if (IS_ERR(uni->base))
+		return PTR_ERR(uni->base);
+
+	uni->fifo_phys_address = uni->mem_region->start +
+				     UNIPERIF_FIFO_DATA_OFFSET(uni);
+
+	uni->irq = platform_get_irq(priv->pdev, 0);
+	if (!uni->irq < 0) {
+		dev_err(dev, "Failed to get IRQ resource");
+		return -ENXIO;
+	}
+
+	dai_data->uni = uni;
+
+	if (of_device_is_compatible(node, "st,sti-uni-player")) {
+		uni_player_init(priv->pdev, uni);
+		stream = &dai->playback;
+	} else {
+		uni_reader_init(priv->pdev, uni);
+		stream = &dai->capture;
+	}
+	dai->ops = uni->dai_ops;
+
+	stream->stream_name = dai->name;
+	stream->channels_min = uni->hw->channels_min;
+	stream->channels_max = uni->hw->channels_max;
+	stream->rates = uni->hw->rates;
+	stream->formats = uni->hw->formats;
+
+	return 0;
+}
+
+static const struct snd_dmaengine_pcm_config dmaengine_pcm_config = {
+	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+};
+
+static int sti_uniperiph_probe(struct platform_device *pdev)
+{
+	struct sti_uniperiph_data *priv;
+	struct device_node *node = pdev->dev.of_node;
+	int ret;
+
+	/* Allocate the private data and the CPU_DAI array */
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	priv->dai = devm_kzalloc(&pdev->dev, sizeof(*priv->dai), GFP_KERNEL);
+	if (!priv->dai)
+		return -ENOMEM;
+
+	priv->pdev = pdev;
+
+	ret = sti_uniperiph_cpu_dai_of(node, priv);
+
+	dev_set_drvdata(&pdev->dev, priv);
+
+	ret = snd_soc_register_component(&pdev->dev,
+					 &sti_uniperiph_dai_component,
+					 priv->dai, 1);
+	if (ret < 0)
+		return ret;
+
+	return devm_snd_dmaengine_pcm_register(&pdev->dev,
+					       &dmaengine_pcm_config, 0);
+}
+
+static const struct of_device_id snd_soc_sti_match[] = {
+	{ .compatible = "st,sti-uni-player", },
+	{ .compatible = "st,sti-uni-reader", },
+	{},
+};
+
+static struct platform_driver sti_uniperiph_driver = {
+	.driver = {
+		.name = "sti-uniperiph-dai",
+		.of_match_table = snd_soc_sti_match,
+	},
+	.probe = sti_uniperiph_probe,
+};
+module_platform_driver(sti_uniperiph_driver);
+
+MODULE_DESCRIPTION("uniperipheral DAI driver");
+MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>");
+MODULE_LICENSE("GPL v2");

sound/soc/sti/uniperif.h

@@ -1215,4 +1215,13 @@ int uni_player_resume(struct uniperif *player);
 /* uniperiph reader */
 int uni_reader_init(struct platform_device *pdev,
 		    struct uniperif *uni_reader);
+
+/* common */
+int sti_uniperiph_dai_set_fmt(struct snd_soc_dai *dai,
+			      unsigned int fmt);
+
+int sti_uniperiph_dai_hw_params(struct snd_pcm_substream *substream,
+				struct snd_pcm_hw_params *params,
+				struct snd_soc_dai *dai);
+
 #endif