1 files changed, 352 insertions, 0 deletions
diff --git a/sound/soc/samsung/odroid.c b/sound/soc/samsung/odroid.c
new file mode 100644
index 000000000..c93cb5a86
--- /dev/null
+++ b/sound/soc/samsung/odroid.c
@@ -0,0 +1,352 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2017 Samsung Electronics Co., Ltd.
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include "i2s.h"
+#include "i2s-regs.h"
+
+struct odroid_priv {
+	struct snd_soc_card card;
+	struct clk *clk_i2s_bus;
+	struct clk *sclk_i2s;
+
+	/* Spinlock protecting fields below */
+	spinlock_t lock;
+	unsigned int be_sample_rate;
+	bool be_active;
+};
+
+static int odroid_card_fe_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
+
+	return 0;
+}
+
+static int odroid_card_fe_hw_params(struct snd_pcm_substream *substream,
+				      struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	if (priv->be_active && priv->be_sample_rate != params_rate(params))
+		ret = -EINVAL;
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return ret;
+}
+
+static const struct snd_soc_ops odroid_card_fe_ops = {
+	.startup = odroid_card_fe_startup,
+	.hw_params = odroid_card_fe_hw_params,
+};
+
+static int odroid_card_be_hw_params(struct snd_pcm_substream *substream,
+				      struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	unsigned int pll_freq, rclk_freq, rfs;
+	unsigned long flags;
+	int ret;
+
+	switch (params_rate(params)) {
+	case 64000:
+		pll_freq = 196608001U;
+		rfs = 384;
+		break;
+	case 44100:
+	case 88200:
+		pll_freq = 180633609U;
+		rfs = 512;
+		break;
+	case 32000:
+	case 48000:
+	case 96000:
+		pll_freq = 196608001U;
+		rfs = 512;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = clk_set_rate(priv->clk_i2s_bus, pll_freq / 2 + 1);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 *  We add 2 to the rclk_freq value in order to avoid too low clock
+	 *  frequency values due to the EPLL output frequency not being exact
+	 *  multiple of the audio sampling rate.
+	 */
+	rclk_freq = params_rate(params) * rfs + 2;
+
+	ret = clk_set_rate(priv->sclk_i2s, rclk_freq);
+	if (ret < 0)
+		return ret;
+
+	if (rtd->dai_link->num_codecs > 1) {
+		struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 1);
+
+		ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
+					     SND_SOC_CLOCK_IN);
+		if (ret < 0)
+			return ret;
+	}
+
+	spin_lock_irqsave(&priv->lock, flags);
+	priv->be_sample_rate = params_rate(params);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static int odroid_card_be_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		priv->be_active = true;
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		priv->be_active = false;
+		break;
+	}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	return 0;
+}
+
+static const struct snd_soc_ops odroid_card_be_ops = {
+	.hw_params = odroid_card_be_hw_params,
+	.trigger = odroid_card_be_trigger,
+};
+
+/* DAPM routes for backward compatibility with old DTS */
+static const struct snd_soc_dapm_route odroid_dapm_routes[] = {
+	{ "I2S Playback", NULL, "Mixer DAI TX" },
+	{ "HiFi Playback", NULL, "Mixer DAI TX" },
+};
+
+SND_SOC_DAILINK_DEFS(primary,
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_DUMMY()),
+	DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s")));
+
+SND_SOC_DAILINK_DEFS(mixer,
+	DAILINK_COMP_ARRAY(COMP_DUMMY()),
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_DUMMY()));
+
+SND_SOC_DAILINK_DEFS(secondary,
+	DAILINK_COMP_ARRAY(COMP_EMPTY()),
+	DAILINK_COMP_ARRAY(COMP_DUMMY()),
+	DAILINK_COMP_ARRAY(COMP_PLATFORM("3830000.i2s-sec")));
+
+static struct snd_soc_dai_link odroid_card_dais[] = {
+	{
+		/* Primary FE <-> BE link */
+		.ops = &odroid_card_fe_ops,
+		.name = "Primary",
+		.stream_name = "Primary",
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		SND_SOC_DAILINK_REG(primary),
+	}, {
+		/* BE <-> CODECs link */
+		.name = "I2S Mixer",
+		.ops = &odroid_card_be_ops,
+		.no_pcm = 1,
+		.dpcm_playback = 1,
+		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+				SND_SOC_DAIFMT_CBS_CFS,
+		SND_SOC_DAILINK_REG(mixer),
+	}, {
+		/* Secondary FE <-> BE link */
+		.playback_only = 1,
+		.ops = &odroid_card_fe_ops,
+		.name = "Secondary",
+		.stream_name = "Secondary",
+		.dynamic = 1,
+		.dpcm_playback = 1,
+		SND_SOC_DAILINK_REG(secondary),
+	}
+};
+
+static int odroid_audio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *cpu_dai = NULL;
+	struct device_node *cpu, *codec;
+	struct odroid_priv *priv;
+	struct snd_soc_card *card;
+	struct snd_soc_dai_link *link, *codec_link;
+	int num_pcms, ret, i;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	card = &priv->card;
+	card->dev = dev;
+
+	card->owner = THIS_MODULE;
+	card->fully_routed = true;
+
+	spin_lock_init(&priv->lock);
+	snd_soc_card_set_drvdata(card, priv);
+
+	ret = snd_soc_of_parse_card_name(card, "model");
+	if (ret < 0)
+		return ret;
+
+	if (of_property_present(dev->of_node, "samsung,audio-widgets")) {
+		ret = snd_soc_of_parse_audio_simple_widgets(card,
+						"samsung,audio-widgets");
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = 0;
+	if (of_property_present(dev->of_node, "audio-routing"))
+		ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
+	else if (of_property_present(dev->of_node, "samsung,audio-routing"))
+		ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
+	if (ret < 0)
+		return ret;
+
+	card->dai_link = odroid_card_dais;
+	card->num_links = ARRAY_SIZE(odroid_card_dais);
+
+	cpu = of_get_child_by_name(dev->of_node, "cpu");
+	codec = of_get_child_by_name(dev->of_node, "codec");
+	link = card->dai_link;
+	codec_link = &card->dai_link[1];
+
+	/*
+	 * For backwards compatibility create the secondary CPU DAI link only
+	 * if there are 2 CPU DAI entries in the cpu sound-dai property in DT.
+	 * Also add required DAPM routes not available in old DTS.
+	 */
+	num_pcms = of_count_phandle_with_args(cpu, "sound-dai",
+					      "#sound-dai-cells");
+	if (num_pcms == 1) {
+		card->dapm_routes = odroid_dapm_routes;
+		card->num_dapm_routes = ARRAY_SIZE(odroid_dapm_routes);
+		card->num_links--;
+	}
+
+	for (i = 0; i < num_pcms; i++, link += 2) {
+		ret = snd_soc_of_get_dai_name(cpu, &link->cpus->dai_name, i);
+		if (ret < 0)
+			break;
+	}
+	if (ret == 0) {
+		cpu_dai = of_parse_phandle(cpu, "sound-dai", 0);
+		if (!cpu_dai)
+			ret = -EINVAL;
+	}
+
+	of_node_put(cpu);
+	if (ret < 0)
+		goto err_put_node;
+
+	ret = snd_soc_of_get_dai_link_codecs(dev, codec, codec_link);
+	if (ret < 0)
+		goto err_put_cpu_dai;
+
+	/* Set capture capability only for boards with the MAX98090 CODEC */
+	if (codec_link->num_codecs > 1) {
+		card->dai_link[0].dpcm_capture = 1;
+		card->dai_link[1].dpcm_capture = 1;
+	}
+
+	priv->sclk_i2s = of_clk_get_by_name(cpu_dai, "i2s_opclk1");
+	if (IS_ERR(priv->sclk_i2s)) {
+		ret = PTR_ERR(priv->sclk_i2s);
+		goto err_put_cpu_dai;
+	}
+
+	priv->clk_i2s_bus = of_clk_get_by_name(cpu_dai, "iis");
+	if (IS_ERR(priv->clk_i2s_bus)) {
+		ret = PTR_ERR(priv->clk_i2s_bus);
+		goto err_put_sclk;
+	}
+
+	ret = devm_snd_soc_register_card(dev, card);
+	if (ret < 0) {
+		dev_err_probe(dev, ret, "snd_soc_register_card() failed\n");
+		goto err_put_clk_i2s;
+	}
+
+	of_node_put(cpu_dai);
+	of_node_put(codec);
+	return 0;
+
+err_put_clk_i2s:
+	clk_put(priv->clk_i2s_bus);
+err_put_sclk:
+	clk_put(priv->sclk_i2s);
+err_put_cpu_dai:
+	of_node_put(cpu_dai);
+	snd_soc_of_put_dai_link_codecs(codec_link);
+err_put_node:
+	of_node_put(codec);
+	return ret;
+}
+
+static void odroid_audio_remove(struct platform_device *pdev)
+{
+	struct odroid_priv *priv = platform_get_drvdata(pdev);
+
+	snd_soc_of_put_dai_link_codecs(&priv->card.dai_link[1]);
+	clk_put(priv->sclk_i2s);
+	clk_put(priv->clk_i2s_bus);
+}
+
+static const struct of_device_id odroid_audio_of_match[] = {
+	{ .compatible	= "hardkernel,odroid-xu3-audio" },
+	{ .compatible	= "hardkernel,odroid-xu4-audio" },
+	{ .compatible	= "samsung,odroid-xu3-audio" },
+	{ .compatible	= "samsung,odroid-xu4-audio" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
+
+static struct platform_driver odroid_audio_driver = {
+	.driver = {
+		.name		= "odroid-audio",
+		.of_match_table	= odroid_audio_of_match,
+		.pm		= &snd_soc_pm_ops,
+	},
+	.probe	= odroid_audio_probe,
+	.remove_new = odroid_audio_remove,
+};
+module_platform_driver(odroid_audio_driver);
+
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
+MODULE_LICENSE("GPL v2");