build/patch/kernel/meson64-dev/0339-ASoC-meson-aiu-add-spdif-encoder-support.patch

From 0db50d02afc25b60e6a43d7f4df7eb83077849fb Mon Sep 17 00:00:00 2001
From: Jerome Brunet <jbrunet@baylibre.com>
Date: Tue, 22 Oct 2019 17:56:56 +0200
Subject: [PATCH 53/94] WIP: ASoC: meson: aiu: add spdif encoder support

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 sound/soc/meson/Kconfig            |   9 +
 sound/soc/meson/Makefile           |   2 +
 sound/soc/meson/aiu-spdif-encode.c | 348 +++++++++++++++++++++++++++++++++++++
 3 files changed, 359 insertions(+)
 create mode 100644 sound/soc/meson/aiu-spdif-encode.c

diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
index 562d960..8028d6b 100644
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -34,6 +34,15 @@ config SND_MESON_AIU_I2S_ENCODER
 	help
 	  Select Y or M to add support for i2s Encoder of the GXL family
 
+config SND_MESON_AIU_SPDIF_ENCODER
+	tristate "Amlogic AIU SPDIF Encoder"
+	imply SND_MESON_AIU_SPDIF_FIFO
+	imply SND_MESON_AIU_BUS
+	select SND_PCM_IEC958
+	select MFD_SYSCON
+	help
+	  Select Y or M to add support for spdif Encoder of the GXL family
+
 config SND_MESON_AXG_FIFO
 	tristate
 	select REGMAP_MMIO
diff --git a/sound/soc/meson/Makefile b/sound/soc/meson/Makefile
index cfbe404..5309af8 100644
--- a/sound/soc/meson/Makefile
+++ b/sound/soc/meson/Makefile
@@ -5,6 +5,7 @@ snd-soc-meson-aiu-fifo-objs := aiu-fifo.o
 snd-soc-meson-aiu-i2s-fifo-objs := aiu-i2s-fifo.o
 snd-soc-meson-aiu-spdif-fifo-objs := aiu-spdif-fifo.o
 snd-soc-meson-aiu-i2s-encode-objs := aiu-i2s-encode.o
+snd-soc-meson-aiu-spdif-encode-objs := aiu-spdif-encode.o
 snd-soc-meson-axg-fifo-objs := axg-fifo.o
 snd-soc-meson-axg-frddr-objs := axg-frddr.o
 snd-soc-meson-axg-toddr-objs := axg-toddr.o
@@ -26,6 +27,7 @@ obj-$(CONFIG_SND_MESON_AIU_FIFO) += snd-soc-meson-aiu-fifo.o
 obj-$(CONFIG_SND_MESON_AIU_I2S_FIFO) += snd-soc-meson-aiu-i2s-fifo.o
 obj-$(CONFIG_SND_MESON_AIU_SPDIF_FIFO) += snd-soc-meson-aiu-spdif-fifo.o
 obj-$(CONFIG_SND_MESON_AIU_I2S_ENCODER) += snd-soc-meson-aiu-i2s-encode.o
+obj-$(CONFIG_SND_MESON_AIU_SPDIF_ENCODER) += snd-soc-meson-aiu-spdif-encode.o
 obj-$(CONFIG_SND_MESON_AXG_FIFO) += snd-soc-meson-axg-fifo.o
 obj-$(CONFIG_SND_MESON_AXG_FRDDR) += snd-soc-meson-axg-frddr.o
 obj-$(CONFIG_SND_MESON_AXG_TODDR) += snd-soc-meson-axg-toddr.o
diff --git a/sound/soc/meson/aiu-spdif-encode.c b/sound/soc/meson/aiu-spdif-encode.c
new file mode 100644
index 0000000..92b1011
--- /dev/null
+++ b/sound/soc/meson/aiu-spdif-encode.c
@@ -0,0 +1,348 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2018 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <sound/pcm_params.h>
+#include <sound/pcm_iec958.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#define AIU_958_MISC			0x010
+#define  AIU_958_MISC_NON_PCM		BIT(0)
+#define  AIU_958_MISC_MODE_16BITS	BIT(1)
+#define  AIU_958_MISC_16BITS_ALIGN	GENMASK(6, 5)
+#define  AIU_958_MISC_MODE_32BITS	BIT(7)
+#define  AIU_958_MISC_U_FROM_STREAM	BIT(12)
+#define  AIU_958_MISC_FORCE_LR		BIT(13)
+#define AIU_958_CHSTAT_L0		0x020
+#define AIU_958_CHSTAT_L1		0x024
+#define AIU_958_CTRL			0x028
+#define  AIU_958_CTRL_HOLD_EN		BIT(0)
+#define AIU_I2S_MISC			0x048
+#define  AIU_I2S_MISC_958_SRC_SHIFT	3
+#define AIU_CLK_CTRL			0x058
+#define  AIU_CLK_CTRL_958_DIV_EN	BIT(1)
+#define  AIU_CLK_CTRL_958_DIV		GENMASK(5, 4)
+#define  AIU_CLK_CTRL_958_DIV_MORE	BIT(12)
+#define AIU_958_CHSTAT_R0		0x0c0
+#define AIU_958_CHSTAT_R1		0x0c4
+
+#define AIU_CS_WORD_LEN			4
+#define AIU_958_INTERNAL_DIV		2
+
+struct aiu_spdif_encode {
+	struct clk *mclk_i958;
+	struct clk *mclk_i2s;
+	struct clk *mclk;
+	struct clk *pclk;
+};
+
+static void aiu_spdif_encode_divider_enable(struct snd_soc_component *component,
+					    bool enable)
+{
+	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+				      AIU_CLK_CTRL_958_DIV_EN,
+				      enable ? AIU_CLK_CTRL_958_DIV_EN : 0);
+}
+
+static void aiu_spdif_encode_hold(struct snd_soc_component *component,
+				  bool enable)
+{
+	snd_soc_component_update_bits(component, AIU_958_CTRL,
+				      AIU_958_CTRL_HOLD_EN,
+				      enable ? AIU_958_CTRL_HOLD_EN : 0);
+}
+
+static int aiu_spdif_encode_trigger(struct snd_pcm_substream *substream, int cmd,
+				    struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+	        aiu_spdif_encode_hold(component, false);
+		return 0;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		aiu_spdif_encode_hold(component, true);
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static int aiu_spdif_encode_setup_cs_word(struct snd_soc_component *component,
+					  struct snd_pcm_hw_params *params)
+{
+	u8 cs[AIU_CS_WORD_LEN];
+	unsigned int val;
+	int ret;
+
+	ret = snd_pcm_create_iec958_consumer_hw_params(params, cs,
+						       AIU_CS_WORD_LEN);
+	if (ret < 0)
+		return ret;
+
+	/* Write the 1st half word */
+	val = cs[1] | cs[0] << 8;
+	snd_soc_component_write(component, AIU_958_CHSTAT_L0, val);
+	snd_soc_component_write(component, AIU_958_CHSTAT_R0, val);
+
+	/* Write the 2nd half word */
+	val = cs[3] | cs[2] << 8;
+	snd_soc_component_write(component, AIU_958_CHSTAT_L1, val);
+	snd_soc_component_write(component, AIU_958_CHSTAT_R1, val);
+
+	return 0;
+}
+
+static int aiu_spdif_encode_hw_params(struct snd_pcm_substream *substream,
+				  struct snd_pcm_hw_params *params,
+				  struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct aiu_spdif_encode *encoder = snd_soc_dai_get_drvdata(dai);
+	unsigned int val = 0, mrate;
+	int ret;
+
+	/* Disable the clock while changing the settings */
+	aiu_spdif_encode_divider_enable(component, false);
+
+	switch (params_physical_width(params)) {
+	case 16:
+		val |= AIU_958_MISC_MODE_16BITS;
+		val |= FIELD_PREP(AIU_958_MISC_16BITS_ALIGN, 2);
+		break;
+	case 32:
+		val |= AIU_958_MISC_MODE_32BITS;
+		break;
+	default:
+		dev_err(dai->dev, "Unsupport physical width\n");
+		return -EINVAL;
+	}
+
+	snd_soc_component_update_bits(component, AIU_958_MISC,
+				      AIU_958_MISC_NON_PCM |
+				      AIU_958_MISC_MODE_16BITS |
+				      AIU_958_MISC_16BITS_ALIGN |
+				      AIU_958_MISC_MODE_32BITS |
+				      AIU_958_MISC_FORCE_LR |
+				      AIU_958_MISC_U_FROM_STREAM,
+				      val);
+
+	/* Set the stream channel status word */
+	ret = aiu_spdif_encode_setup_cs_word(component, params);
+	if (ret) {
+		dev_err(dai->dev, "failed to set channel status word\n");
+		return ret;
+	}
+
+	snd_soc_component_update_bits(component, AIU_CLK_CTRL,
+				      AIU_CLK_CTRL_958_DIV |
+				      AIU_CLK_CTRL_958_DIV_MORE,
+				      FIELD_PREP(AIU_CLK_CTRL_958_DIV,
+						 __ffs(AIU_958_INTERNAL_DIV)));
+
+	/* 2 * 32bits per subframe * 2 channels = 128 */
+	mrate = params_rate(params) * 128 * AIU_958_INTERNAL_DIV;
+	ret = clk_set_rate(encoder->mclk, mrate);
+	if (ret) {
+		dev_err(dai->dev, "failed to set mclk rate\n");
+		return ret;
+	}
+
+	aiu_spdif_encode_divider_enable(component, true);
+
+	return 0;
+}
+
+static int aiu_spdif_encode_hw_free(struct snd_pcm_substream *substream,
+				    struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+
+	aiu_spdif_encode_divider_enable(component, false);
+
+	return 0;
+}
+
+static int aiu_spdif_encode_startup(struct snd_pcm_substream *substream,
+				    struct snd_soc_dai *dai)
+{
+	struct aiu_spdif_encode *encoder = snd_soc_dai_get_drvdata(dai);
+	int ret;
+
+	/* make sure the spdif block is on its own divider */
+	ret = clk_set_parent(encoder->mclk, encoder->mclk_i958);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(encoder->pclk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(encoder->mclk);
+	if (ret)
+		clk_disable_unprepare(encoder->pclk);
+
+	return ret;
+}
+
+static void aiu_spdif_encode_shutdown(struct snd_pcm_substream *substream,
+				      struct snd_soc_dai *dai)
+{
+	struct aiu_spdif_encode *encoder = snd_soc_dai_get_drvdata(dai);
+
+	clk_disable_unprepare(encoder->mclk);
+	clk_disable_unprepare(encoder->pclk);
+}
+
+static const struct snd_soc_dai_ops aiu_spdif_encode_dai_ops = {
+	.trigger	= aiu_spdif_encode_trigger,
+	.hw_params	= aiu_spdif_encode_hw_params,
+	.hw_free	= aiu_spdif_encode_hw_free,
+	.startup	= aiu_spdif_encode_startup,
+	.shutdown	= aiu_spdif_encode_shutdown,
+};
+
+static struct snd_soc_dai_driver aiu_spdif_encode_dai_drv = {
+	.playback = {
+		.stream_name = "Playback",
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = (SNDRV_PCM_RATE_32000  |
+			  SNDRV_PCM_RATE_44100  |
+			  SNDRV_PCM_RATE_48000  |
+			  SNDRV_PCM_RATE_88200  |
+			  SNDRV_PCM_RATE_96000  |
+			  SNDRV_PCM_RATE_176400 |
+			  SNDRV_PCM_RATE_192000),
+		.formats = (SNDRV_PCM_FMTBIT_S16_LE |
+			    SNDRV_PCM_FMTBIT_S20_LE |
+			    SNDRV_PCM_FMTBIT_S24_LE),
+	},
+	.ops = &aiu_spdif_encode_dai_ops,
+};
+
+int aiu_spdif_encode_component_probe(struct snd_soc_component *component)
+{
+	struct device *dev = component->dev;
+	struct regmap *map;
+
+	map = syscon_node_to_regmap(dev->parent->of_node);
+	if (IS_ERR(map)) {
+		dev_err(dev, "Could not get regmap\n");
+		return PTR_ERR(map);
+	}
+
+	snd_soc_component_init_regmap(component, map);
+
+	return 0;
+}
+
+static const char * const aiu_spdif_encode_sel_texts[] = {
+	"SPDIF", "I2S",
+};
+
+static SOC_ENUM_SINGLE_DECL(aiu_spdif_encode_sel_enum, AIU_I2S_MISC,
+			    AIU_I2S_MISC_958_SRC_SHIFT,
+			    aiu_spdif_encode_sel_texts);
+
+static const struct snd_kcontrol_new aiu_spdif_encode_mux =
+	SOC_DAPM_ENUM("Buffer Src", aiu_spdif_encode_sel_enum);
+
+static const struct snd_soc_dapm_widget aiu_spdif_encode_dapm_widgets[] = {
+	SND_SOC_DAPM_AIF_IN("SPDIF IN", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("I2S IN", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &aiu_spdif_encode_mux),
+};
+
+static const struct snd_soc_dapm_route aiu_spdif_encode_dapm_routes[] = {
+	{ "SRC SEL", "SPDIF", "SPDIF IN" },
+	{ "SRC SEL", "I2S", "I2S IN" },
+	{ "Playback", NULL, "SRC SEL" },
+};
+
+static const struct snd_soc_component_driver aiu_spdif_encode_component = {
+	.dapm_widgets		= aiu_spdif_encode_dapm_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(aiu_spdif_encode_dapm_widgets),
+	.dapm_routes		= aiu_spdif_encode_dapm_routes,
+	.num_dapm_routes	= ARRAY_SIZE(aiu_spdif_encode_dapm_routes),
+	.probe 			= aiu_spdif_encode_component_probe,
+};
+
+static int aiu_spdif_encode_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct aiu_spdif_encode *encoder;
+
+	encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
+	if (!encoder)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, encoder);
+
+	encoder->pclk = devm_clk_get(dev, "pclk");
+	if (IS_ERR(encoder->pclk)) {
+		if (PTR_ERR(encoder->pclk) != -EPROBE_DEFER)
+			dev_err(dev,
+				"Can't get the dai clock gate\n");
+		return PTR_ERR(encoder->pclk);
+	}
+
+	encoder->mclk_i958 = devm_clk_get(dev, "mclk_i958");
+	if (IS_ERR(encoder->mclk_i958)) {
+		if (PTR_ERR(encoder->mclk_i958) != -EPROBE_DEFER)
+			dev_err(dev, "Can't get the spdif master clock\n");
+		return PTR_ERR(encoder->mclk_i958);
+	}
+
+	/*
+	 * NOTE: the spdif can be clock by i2s master clock or its own clock,
+	 * We should (maybe) change the source depending on the origin of the
+	 * data.
+	 * However, considering the clocking scheme used on these platforms,
+	 * the master clocks should pick the same PLL source when they are
+	 * playing from the same FIFO. The clock should be in sync so, it
+	 * should not be necessary to reparent the spdif master clock.
+	 */
+
+	encoder->mclk = devm_clk_get(dev, "mclk");
+	if (IS_ERR(encoder->mclk)) {
+		if (PTR_ERR(encoder->mclk) != -EPROBE_DEFER)
+			dev_err(dev, "Can't get the spdif input mux clock\n");
+		return PTR_ERR(encoder->mclk);
+	}
+
+	return devm_snd_soc_register_component(dev, &aiu_spdif_encode_component,
+					       &aiu_spdif_encode_dai_drv, 1);
+}
+
+static const struct of_device_id aiu_spdif_encode_of_match[] = {
+	{ .compatible = "amlogic,aiu-spdif-encode", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, aiu_spdif_encode_of_match);
+
+static struct platform_driver aiu_spdif_encode_pdrv = {
+	.probe = aiu_spdif_encode_probe,
+	.driver = {
+		.name = "meson-aiu-spdif-encode",
+		.of_match_table = aiu_spdif_encode_of_match,
+	},
+};
+module_platform_driver(aiu_spdif_encode_pdrv);
+
+MODULE_DESCRIPTION("Meson AIU SPDIF Encode Driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.7.1