sound: soc: xilinx: Add ZynqMP DP subsystem audio drivers

The DisplayPort subsystem of Xilinx ZynqMP SOC supports audio through, DPDMA - Audio buffer manager - Audio blender - DP. The DPDMA driver is implemented based on DMA engine API, and the audio driver is based on snd dmaengine pcm helpers. Signed-off-by: Hyun Kwon <[email protected]> Signed-off-by: Michal Simek <[email protected]>
tingykao · Mar 9, 2015 · dad01aa · dad01aa
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diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
@@ -55,6 +55,7 @@ source "sound/soc/spear/Kconfig"
 source "sound/soc/tegra/Kconfig"
 source "sound/soc/txx9/Kconfig"
 source "sound/soc/ux500/Kconfig"
+source "sound/soc/xilinx/Kconfig"
 
 # Supported codecs
 source "sound/soc/codecs/Kconfig"

diff --git a/sound/soc/Makefile b/sound/soc/Makefile
@@ -32,3 +32,4 @@ obj-$(CONFIG_SND_SOC)	+= spear/
 obj-$(CONFIG_SND_SOC)	+= tegra/
 obj-$(CONFIG_SND_SOC)	+= txx9/
 obj-$(CONFIG_SND_SOC)	+= ux500/
+obj-$(CONFIG_SND_SOC)	+= xilinx/
diff --git a/sound/soc/xilinx/Kconfig b/sound/soc/xilinx/Kconfig
@@ -0,0 +1,5 @@
+config SND_SOC_XILINX_DP
+	tristate "Audio support for the the Xilinx DisplayPort"
+	select SND_DMAENGINE_PCM
+	help
+	  Audio support the for Xilinx DisplayPort.
diff --git a/sound/soc/xilinx/Makefile b/sound/soc/xilinx/Makefile
@@ -0,0 +1,3 @@
+snd-soc-xilinx-dp-objs := xilinx-dp-pcm.o xilinx-dp-codec.o xilinx-dp-card.o
+
+obj-$(CONFIG_SND_SOC_XILINX_DP) += snd-soc-xilinx-dp.o
diff --git a/sound/soc/xilinx/xilinx-dp-card.c b/sound/soc/xilinx/xilinx-dp-card.c
@@ -0,0 +1,102 @@
+/*
+ * Xilinx DisplayPort SoC Sound Card support
+ *
+ *  Copyright (C) 2015 Xilinx, Inc.
+ *
+ *  Author: Hyun Woo Kwon <[email protected]>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <sound/soc.h>
+
+static struct snd_soc_dai_link xilinx_dp_dai_links[] = {
+	{
+		.name		= "xilinx-dp0",
+		.codec_dai_name	= "xilinx-dp-snd-codec-dai",
+	},
+	{
+		.name		= "xilinx-dp1",
+		.codec_dai_name	= "xilinx-dp-snd-codec-dai",
+	},
+
+};
+
+static struct snd_soc_card xilinx_dp_card = {
+	.name		= "DisplayPort monitor",
+	.owner		= THIS_MODULE,
+	.dai_link	= xilinx_dp_dai_links,
+	.num_links	= 2,
+};
+
+static int xilinx_dp_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &xilinx_dp_card;
+	struct device_node *node = pdev->dev.of_node;
+	struct device_node *codec, *pcm;
+	int ret;
+
+	card->dev = &pdev->dev;
+
+	codec = of_parse_phandle(node, "xlnx,dp-snd-codec", 0);
+	if (!codec)
+		return -ENODEV;
+
+	pcm = of_parse_phandle(node, "xlnx,dp-snd-pcm", 0);
+	if (!pcm)
+		return -ENODEV;
+	xilinx_dp_dai_links[0].platform_of_node = pcm;
+	xilinx_dp_dai_links[0].cpu_of_node = codec;
+	xilinx_dp_dai_links[0].codec_of_node = codec;
+
+	pcm = of_parse_phandle(node, "xlnx,dp-snd-pcm", 1);
+	if (!pcm)
+		return -ENODEV;
+	xilinx_dp_dai_links[1].platform_of_node = pcm;
+	xilinx_dp_dai_links[1].cpu_of_node = codec;
+	xilinx_dp_dai_links[1].codec_of_node = codec;
+
+	ret = devm_snd_soc_register_card(&pdev->dev, card);
+	if (ret)
+		return ret;
+
+	dev_info(&pdev->dev, "Xilinx DisplayPort Sound Card probed\n");
+
+	return 0;
+}
+
+static int xilinx_dp_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id xilinx_dp_of_match[] = {
+	{ .compatible = "xlnx,dp-snd-card", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xilinx_dp_of_match);
+
+static struct platform_driver xilinx_dp_aud_driver = {
+	.driver	= {
+		.name		= "xilinx-dp-snd-card",
+		.of_match_table	= xilinx_dp_of_match,
+		.pm		= &snd_soc_pm_ops,
+	},
+	.probe	= xilinx_dp_probe,
+	.remove	= xilinx_dp_remove,
+};
+module_platform_driver(xilinx_dp_aud_driver);
+
+MODULE_DESCRIPTION("Xilinx DisplayPort Sound Card module");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/xilinx/xilinx-dp-codec.c b/sound/soc/xilinx/xilinx-dp-codec.c
@@ -0,0 +1,118 @@
+/*
+ * Xilinx DisplayPort Sound Codec support
+ *
+ *  Copyright (C) 2015 Xilinx, Inc.
+ *
+ *  Author: Hyun Woo Kwon <[email protected]>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/soc.h>
+
+/**
+ * struct xilinx_dp_codec - DisplayPort codec
+ * @aud_clk: audio clock
+ */
+struct xilinx_dp_codec {
+	struct clk *aud_clk;
+};
+
+static struct snd_soc_dai_driver xilinx_dp_codec_dai = {
+	.name		= "xilinx-dp-snd-codec-dai",
+	.playback	= {
+		.channels_min	= 2,
+		.channels_max	= 2,
+		.rates		= SNDRV_PCM_RATE_44100,
+		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
+	},
+};
+
+static const struct snd_soc_codec_driver xilinx_dp_codec_codec_driver = {
+};
+
+static int xilinx_dp_codec_probe(struct platform_device *pdev)
+{
+	struct xilinx_dp_codec *codec;
+	int rate, ret;
+
+	codec = devm_kzalloc(&pdev->dev, sizeof(*codec), GFP_KERNEL);
+	if (!codec)
+		return -ENOMEM;
+
+	codec->aud_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(codec->aud_clk))
+		return PTR_ERR(codec->aud_clk);
+
+	ret = clk_prepare_enable(codec->aud_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to enable the aud_clk\n");
+		return ret;
+	}
+
+	rate = clk_get_rate(codec->aud_clk) / 512;
+	if (rate == 44100) {
+		xilinx_dp_codec_dai.playback.rates = SNDRV_PCM_RATE_44100;
+	} else if (rate == 48000) {
+		xilinx_dp_codec_dai.playback.rates = SNDRV_PCM_RATE_48000;
+	} else {
+		ret = -EINVAL;
+		goto error_clk;
+	}
+
+	ret = snd_soc_register_codec(&pdev->dev, &xilinx_dp_codec_codec_driver,
+				     &xilinx_dp_codec_dai, 1);
+	if (ret)
+		goto error_clk;
+
+	platform_set_drvdata(pdev, codec);
+
+	dev_info(&pdev->dev, "Xilinx DisplayPort Sound Codec probed\n");
+
+	return 0;
+
+error_clk:
+	clk_disable_unprepare(codec->aud_clk);
+	return ret;
+}
+
+static int xilinx_dp_codec_dev_remove(struct platform_device *pdev)
+{
+	struct xilinx_dp_codec *codec = platform_get_drvdata(pdev);
+
+	snd_soc_unregister_codec(&pdev->dev);
+	clk_disable_unprepare(codec->aud_clk);
+
+	return 0;
+}
+
+static const struct of_device_id xilinx_dp_codec_of_match[] = {
+	{ .compatible = "xlnx,dp-snd-codec", },
+	{ /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, xilinx_dp_codec_of_match);
+
+static struct platform_driver xilinx_dp_codec_driver = {
+	.driver	= {
+		.name		= "xilinx-dp-snd-codec",
+		.of_match_table	= xilinx_dp_codec_of_match,
+	},
+	.probe	= xilinx_dp_codec_probe,
+	.remove	= xilinx_dp_codec_dev_remove,
+};
+module_platform_driver(xilinx_dp_codec_driver);
+
+MODULE_DESCRIPTION("Xilinx DisplayPort Sound Codec module");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/xilinx/xilinx-dp-pcm.c b/sound/soc/xilinx/xilinx-dp-pcm.c
@@ -0,0 +1,81 @@
+/*
+ * Xilinx DisplayPort Sound PCM support
+ *
+ *  Copyright (C) 2015 Xilinx, Inc.
+ *
+ *  Author: Hyun Woo Kwon <[email protected]>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+
+static const struct snd_pcm_hardware xilinx_pcm_hw = {
+	.info			= SNDRV_PCM_INFO_MMAP |
+				  SNDRV_PCM_INFO_MMAP_VALID |
+				  SNDRV_PCM_INFO_INTERLEAVED |
+				  SNDRV_PCM_INFO_PAUSE |
+				  SNDRV_PCM_INFO_RESUME |
+				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
+	.buffer_bytes_max	= 128 * 1024,
+	.period_bytes_min	= 256,
+	.period_bytes_max	= 1024 * 1024,
+	.periods_min		= 2,
+	.periods_max		= 256,
+};
+
+static const struct snd_dmaengine_pcm_config xilinx_dmaengine_pcm_config = {
+	.pcm_hardware = &xilinx_pcm_hw,
+	.prealloc_buffer_size = 64 * 1024,
+};
+
+static int xilinx_dp_pcm_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
+					      &xilinx_dmaengine_pcm_config, 0);
+	if (ret)
+		return ret;
+
+	dev_info(&pdev->dev, "Xilinx DisplayPort Sound PCM probed\n");
+
+	return 0;
+}
+
+static int xilinx_dp_pcm_dev_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id xilinx_dp_pcm_of_match[] = {
+	{ .compatible = "xlnx,dp-snd-pcm", },
+	{ /* end of table */ },
+};
+MODULE_DEVICE_TABLE(of, xilinx_dp_pcm_of_match);
+
+static struct platform_driver xilinx_dp_pcm_driver = {
+	.driver	= {
+		.name		= "xilinx-dp-snd-pcm",
+		.of_match_table	= xilinx_dp_pcm_of_match,
+	},
+	.probe	= xilinx_dp_pcm_probe,
+	.remove	= xilinx_dp_pcm_dev_remove,
+};
+module_platform_driver(xilinx_dp_pcm_driver);
+
+MODULE_DESCRIPTION("Xilinx DisplayPort Sound PCM module");
+MODULE_LICENSE("GPL v2");
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		snd-soc-xilinx-dp-objs := xilinx-dp-pcm.o xilinx-dp-codec.o xilinx-dp-card.o

		obj-$(CONFIG_SND_SOC_XILINX_DP) += snd-soc-xilinx-dp.o