ASoC: tegra: Add Tegra210 based Mixer driver

The Mixer supports mixing of up to ten 7.1 audio input streams and
generate five outputs (each of which can be any combination of the
ten input streams)

This patch registers Mixer driver with ASoC framework. The component
driver exposes DAPM widgets, routes and kcontrols for the device.
The DAI driver exposes Mixer interfaces, which can be used to connect
different components in the ASoC layer. Makefile and Kconfig support
is added to allow build the driver. It can be enabled in the DT via
"nvidia,tegra210-amixer" compatible binding.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1631551342-25469-11-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 674 insertions, 0 deletions

diff --git a/sound/soc/tegra/tegra210_mixer.c b/sound/soc/tegra/tegra210_mixer.c
new file mode 100644
index 000000000000..53fcd8f6605a
--- /dev/null
+++ b/sound/soc/tegra/tegra210_mixer.c
@@ -0,0 +1,674 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// tegra210_mixer.c - Tegra210 MIXER driver
+//
+// Copyright (c) 2021 NVIDIA CORPORATION.  All rights reserved.
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "tegra210_mixer.h"
+#include "tegra_cif.h"
+
+#define MIXER_REG(reg, id)	((reg) + ((id) * TEGRA210_MIXER_REG_STRIDE))
+#define MIXER_REG_BASE(reg)	((reg) % TEGRA210_MIXER_REG_STRIDE)
+
+#define MIXER_GAIN_CFG_RAM_ADDR(id)					\
+	(TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_0 +				\
+	 ((id) * TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_STRIDE))
+
+#define MIXER_RX_REG_DEFAULTS(id)					\
+	{ MIXER_REG(TEGRA210_MIXER_RX1_CIF_CTRL, id), 0x00007700},	\
+	{ MIXER_REG(TEGRA210_MIXER_RX1_CTRL, id), 0x00010823},	\
+	{ MIXER_REG(TEGRA210_MIXER_RX1_PEAK_CTRL, id), 0x000012c0}
+
+#define MIXER_TX_REG_DEFAULTS(id)					\
+	{ MIXER_REG(TEGRA210_MIXER_TX1_INT_MASK, (id)), 0x00000001},	\
+	{ MIXER_REG(TEGRA210_MIXER_TX1_CIF_CTRL, (id)), 0x00007700}
+
+#define REG_DURATION_PARAM(reg, i) ((reg) + NUM_GAIN_POLY_COEFFS + 1 + (i))
+
+static const struct reg_default tegra210_mixer_reg_defaults[] = {
+	/* Inputs */
+	MIXER_RX_REG_DEFAULTS(0),
+	MIXER_RX_REG_DEFAULTS(1),
+	MIXER_RX_REG_DEFAULTS(2),
+	MIXER_RX_REG_DEFAULTS(3),
+	MIXER_RX_REG_DEFAULTS(4),
+	MIXER_RX_REG_DEFAULTS(5),
+	MIXER_RX_REG_DEFAULTS(6),
+	MIXER_RX_REG_DEFAULTS(7),
+	MIXER_RX_REG_DEFAULTS(8),
+	MIXER_RX_REG_DEFAULTS(9),
+	/* Outputs */
+	MIXER_TX_REG_DEFAULTS(0),
+	MIXER_TX_REG_DEFAULTS(1),
+	MIXER_TX_REG_DEFAULTS(2),
+	MIXER_TX_REG_DEFAULTS(3),
+	MIXER_TX_REG_DEFAULTS(4),
+
+	{ TEGRA210_MIXER_CG, 0x00000001},
+	{ TEGRA210_MIXER_GAIN_CFG_RAM_CTRL, 0x00004000},
+	{ TEGRA210_MIXER_PEAKM_RAM_CTRL, 0x00004000},
+	{ TEGRA210_MIXER_ENABLE, 0x1 },
+};
+
+/* Default gain parameters */
+static const struct tegra210_mixer_gain_params gain_params = {
+	/* Polynomial coefficients */
+	{ 0, 0, 0, 0, 0, 0, 0, 0x1000000, 0 },
+	/* Gain value */
+	0x10000,
+	/* Duration Parameters */
+	{ 0, 0, 0x400, 0x8000000 },
+};
+
+static int __maybe_unused tegra210_mixer_runtime_suspend(struct device *dev)
+{
+	struct tegra210_mixer *mixer = dev_get_drvdata(dev);
+
+	regcache_cache_only(mixer->regmap, true);
+	regcache_mark_dirty(mixer->regmap);
+
+	return 0;
+}
+
+static int __maybe_unused tegra210_mixer_runtime_resume(struct device *dev)
+{
+	struct tegra210_mixer *mixer = dev_get_drvdata(dev);
+
+	regcache_cache_only(mixer->regmap, false);
+	regcache_sync(mixer->regmap);
+
+	return 0;
+}
+
+static int tegra210_mixer_write_ram(struct tegra210_mixer *mixer,
+				    unsigned int addr,
+				    unsigned int coef)
+{
+	unsigned int reg, val;
+	int err;
+
+	/* Check if busy */
+	err = regmap_read_poll_timeout(mixer->regmap,
+				       TEGRA210_MIXER_GAIN_CFG_RAM_CTRL,
+				       val, !(val & 0x80000000), 10, 10000);
+	if (err < 0)
+		return err;
+
+	reg = (addr << TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_SHIFT) &
+	      TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_MASK;
+	reg |= TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_INIT_EN;
+	reg |= TEGRA210_MIXER_GAIN_CFG_RAM_RW_WRITE;
+	reg |= TEGRA210_MIXER_GAIN_CFG_RAM_SEQ_ACCESS_EN;
+
+	regmap_write(mixer->regmap,
+		     TEGRA210_MIXER_GAIN_CFG_RAM_CTRL,
+		     reg);
+	regmap_write(mixer->regmap,
+		     TEGRA210_MIXER_GAIN_CFG_RAM_DATA,
+		     coef);
+
+	return 0;
+}
+
+static int tegra210_mixer_configure_gain(struct snd_soc_component *cmpnt,
+					 unsigned int id, bool instant_gain)
+{
+	struct tegra210_mixer *mixer = snd_soc_component_get_drvdata(cmpnt);
+	unsigned int reg = MIXER_GAIN_CFG_RAM_ADDR(id);
+	int err, i;
+
+	pm_runtime_get_sync(cmpnt->dev);
+
+	/* Write default gain poly coefficients */
+	for (i = 0; i < NUM_GAIN_POLY_COEFFS; i++) {
+		err = tegra210_mixer_write_ram(mixer, reg + i,
+					       gain_params.poly_coeff[i]);
+
+		if (err < 0)
+			goto rpm_put;
+	}
+
+	/* Write stored gain value */
+	err = tegra210_mixer_write_ram(mixer, reg + NUM_GAIN_POLY_COEFFS,
+				       mixer->gain_value[id]);
+	if (err < 0)
+		goto rpm_put;
+
+	/* Write duration parameters */
+	for (i = 0; i < NUM_DURATION_PARMS; i++) {
+		int val;
+
+		if (instant_gain)
+			val = 1;
+		else
+			val = gain_params.duration[i];
+
+		err = tegra210_mixer_write_ram(mixer,
+					       REG_DURATION_PARAM(reg, i),
+					       val);
+		if (err < 0)
+			goto rpm_put;
+	}
+
+	/* Trigger to apply gain configurations */
+	err = tegra210_mixer_write_ram(mixer, reg + REG_CFG_DONE_TRIGGER,
+				       VAL_CFG_DONE_TRIGGER);
+
+rpm_put:
+	pm_runtime_put(cmpnt->dev);
+
+	return err;
+}
+
+static int tegra210_mixer_get_gain(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct soc_mixer_control *mc =
+		(struct soc_mixer_control *)kcontrol->private_value;
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct tegra210_mixer *mixer = snd_soc_component_get_drvdata(cmpnt);
+	unsigned int reg = mc->reg;
+	unsigned int i;
+
+	i = (reg - TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_0) /
+	    TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_STRIDE;
+
+	ucontrol->value.integer.value[0] = mixer->gain_value[i];
+
+	return 0;
+}
+
+static int tegra210_mixer_put_gain(struct snd_kcontrol *kcontrol,
+				   struct snd_ctl_elem_value *ucontrol)
+{
+	struct soc_mixer_control *mc =
+		(struct soc_mixer_control *)kcontrol->private_value;
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct tegra210_mixer *mixer = snd_soc_component_get_drvdata(cmpnt);
+	unsigned int reg = mc->reg, id;
+	bool instant_gain = false;
+	int err;
+
+	if (strstr(kcontrol->id.name, "Instant Gain Volume"))
+		instant_gain = true;
+
+	/* Save gain value for specific MIXER input */
+	id = (reg - TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_0) /
+	     TEGRA210_MIXER_GAIN_CFG_RAM_ADDR_STRIDE;
+
+	mixer->gain_value[id] = ucontrol->value.integer.value[0];
+
+	err = tegra210_mixer_configure_gain(cmpnt, id, instant_gain);
+	if (err) {
+		dev_err(cmpnt->dev, "Failed to apply gain\n");
+		return err;
+	}
+
+	return 1;
+}
+
+static int tegra210_mixer_set_audio_cif(struct tegra210_mixer *mixer,
+					struct snd_pcm_hw_params *params,
+					unsigned int reg,
+					unsigned int id)
+{
+	unsigned int channels, audio_bits;
+	struct tegra_cif_conf cif_conf;
+
+	memset(&cif_conf, 0, sizeof(struct tegra_cif_conf));
+
+	channels = params_channels(params);
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		audio_bits = TEGRA_ACIF_BITS_16;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		audio_bits = TEGRA_ACIF_BITS_32;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	cif_conf.audio_ch = channels;
+	cif_conf.client_ch = channels;
+	cif_conf.audio_bits = audio_bits;
+	cif_conf.client_bits = audio_bits;
+
+	tegra_set_cif(mixer->regmap,
+		      reg + (id * TEGRA210_MIXER_REG_STRIDE),
+		      &cif_conf);
+
+	return 0;
+}
+
+static int tegra210_mixer_in_hw_params(struct snd_pcm_substream *substream,
+				       struct snd_pcm_hw_params *params,
+				       struct snd_soc_dai *dai)
+{
+	struct tegra210_mixer *mixer = snd_soc_dai_get_drvdata(dai);
+	int err;
+
+	err = tegra210_mixer_set_audio_cif(mixer, params,
+					   TEGRA210_MIXER_RX1_CIF_CTRL,
+					   dai->id);
+	if (err < 0)
+		return err;
+
+	return tegra210_mixer_configure_gain(dai->component, dai->id, false);
+}
+
+static int tegra210_mixer_out_hw_params(struct snd_pcm_substream *substream,
+					struct snd_pcm_hw_params *params,
+					struct snd_soc_dai *dai)
+{
+	struct tegra210_mixer *mixer = snd_soc_dai_get_drvdata(dai);
+
+	return tegra210_mixer_set_audio_cif(mixer, params,
+					    TEGRA210_MIXER_TX1_CIF_CTRL,
+					    dai->id - TEGRA210_MIXER_RX_MAX);
+}
+
+static struct snd_soc_dai_ops tegra210_mixer_out_dai_ops = {
+	.hw_params	= tegra210_mixer_out_hw_params,
+};
+
+static struct snd_soc_dai_ops tegra210_mixer_in_dai_ops = {
+	.hw_params	= tegra210_mixer_in_hw_params,
+};
+
+#define IN_DAI(id)						\
+	{							\
+		.name = "MIXER-RX-CIF"#id,			\
+		.playback = {					\
+			.stream_name = "RX" #id "-CIF-Playback",\
+			.channels_min = 1,			\
+			.channels_max = 8,			\
+			.rates = SNDRV_PCM_RATE_8000_192000,	\
+			.formats = SNDRV_PCM_FMTBIT_S8 |	\
+				SNDRV_PCM_FMTBIT_S16_LE |	\
+				SNDRV_PCM_FMTBIT_S32_LE,	\
+		},						\
+		.capture = {					\
+			.stream_name = "RX" #id "-CIF-Capture",	\
+			.channels_min = 1,			\
+			.channels_max = 8,			\
+			.rates = SNDRV_PCM_RATE_8000_192000,	\
+			.formats = SNDRV_PCM_FMTBIT_S8 |	\
+				SNDRV_PCM_FMTBIT_S16_LE |	\
+				SNDRV_PCM_FMTBIT_S32_LE,	\
+		},						\
+		.ops = &tegra210_mixer_in_dai_ops,		\
+	}
+
+#define OUT_DAI(id)						\
+	{							\
+		.name = "MIXER-TX-CIF" #id,			\
+		.playback = {					\
+			.stream_name = "TX" #id "-CIF-Playback",\
+			.channels_min = 1,			\
+			.channels_max = 8,			\
+			.rates = SNDRV_PCM_RATE_8000_192000,	\
+			.formats = SNDRV_PCM_FMTBIT_S8 |	\
+				SNDRV_PCM_FMTBIT_S16_LE |	\
+				SNDRV_PCM_FMTBIT_S32_LE,	\
+		},						\
+		.capture = {					\
+			.stream_name = "TX" #id "-CIF-Capture",	\
+			.channels_min = 1,			\
+			.channels_max = 8,			\
+			.rates = SNDRV_PCM_RATE_8000_192000,	\
+			.formats = SNDRV_PCM_FMTBIT_S8 |	\
+				SNDRV_PCM_FMTBIT_S16_LE |	\
+				SNDRV_PCM_FMTBIT_S32_LE,	\
+		},						\
+		.ops = &tegra210_mixer_out_dai_ops,		\
+	}
+
+static struct snd_soc_dai_driver tegra210_mixer_dais[] = {
+	/* Mixer Input */
+	IN_DAI(1),
+	IN_DAI(2),
+	IN_DAI(3),
+	IN_DAI(4),
+	IN_DAI(5),
+	IN_DAI(6),
+	IN_DAI(7),
+	IN_DAI(8),
+	IN_DAI(9),
+	IN_DAI(10),
+
+	/* Mixer Output */
+	OUT_DAI(1),
+	OUT_DAI(2),
+	OUT_DAI(3),
+	OUT_DAI(4),
+	OUT_DAI(5),
+};
+
+#define ADDER_CTRL_DECL(name, reg)			\
+	static const struct snd_kcontrol_new name[] = {	\
+		SOC_DAPM_SINGLE("RX1", reg, 0, 1, 0),	\
+		SOC_DAPM_SINGLE("RX2", reg, 1, 1, 0),	\
+		SOC_DAPM_SINGLE("RX3", reg, 2, 1, 0),	\
+		SOC_DAPM_SINGLE("RX4", reg, 3, 1, 0),	\
+		SOC_DAPM_SINGLE("RX5", reg, 4, 1, 0),	\
+		SOC_DAPM_SINGLE("RX6", reg, 5, 1, 0),	\
+		SOC_DAPM_SINGLE("RX7", reg, 6, 1, 0),	\
+		SOC_DAPM_SINGLE("RX8", reg, 7, 1, 0),	\
+		SOC_DAPM_SINGLE("RX9", reg, 8, 1, 0),	\
+		SOC_DAPM_SINGLE("RX10", reg, 9, 1, 0),	\
+	}
+
+ADDER_CTRL_DECL(adder1, TEGRA210_MIXER_TX1_ADDER_CONFIG);
+ADDER_CTRL_DECL(adder2, TEGRA210_MIXER_TX2_ADDER_CONFIG);
+ADDER_CTRL_DECL(adder3, TEGRA210_MIXER_TX3_ADDER_CONFIG);
+ADDER_CTRL_DECL(adder4, TEGRA210_MIXER_TX4_ADDER_CONFIG);
+ADDER_CTRL_DECL(adder5, TEGRA210_MIXER_TX5_ADDER_CONFIG);
+
+#define GAIN_CTRL(id)	\
+	SOC_SINGLE_EXT("RX" #id " Gain Volume",			\
+		       MIXER_GAIN_CFG_RAM_ADDR((id) - 1), 0,	\
+		       0x20000, 0, tegra210_mixer_get_gain,	\
+		       tegra210_mixer_put_gain),		\
+	SOC_SINGLE_EXT("RX" #id " Instant Gain Volume",		\
+		       MIXER_GAIN_CFG_RAM_ADDR((id) - 1), 0,	\
+		       0x20000, 0, tegra210_mixer_get_gain,	\
+		       tegra210_mixer_put_gain),
+
+/* Volume controls for all MIXER inputs */
+static const struct snd_kcontrol_new tegra210_mixer_gain_ctls[] = {
+	GAIN_CTRL(1)
+	GAIN_CTRL(2)
+	GAIN_CTRL(3)
+	GAIN_CTRL(4)
+	GAIN_CTRL(5)
+	GAIN_CTRL(6)
+	GAIN_CTRL(7)
+	GAIN_CTRL(8)
+	GAIN_CTRL(9)
+	GAIN_CTRL(10)
+};
+
+static const struct snd_soc_dapm_widget tegra210_mixer_widgets[] = {
+	SND_SOC_DAPM_AIF_IN("RX1", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX2", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX3", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX4", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX5", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX6", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX7", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX8", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX9", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_IN("RX10", NULL, 0, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("TX1", NULL, 0, TEGRA210_MIXER_TX1_ENABLE, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("TX2", NULL, 0, TEGRA210_MIXER_TX2_ENABLE, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("TX3", NULL, 0, TEGRA210_MIXER_TX3_ENABLE, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("TX4", NULL, 0, TEGRA210_MIXER_TX4_ENABLE, 0, 0),
+	SND_SOC_DAPM_AIF_OUT("TX5", NULL, 0, TEGRA210_MIXER_TX5_ENABLE, 0, 0),
+	SND_SOC_DAPM_MIXER("Adder1", SND_SOC_NOPM, 1, 0, adder1,
+			   ARRAY_SIZE(adder1)),
+	SND_SOC_DAPM_MIXER("Adder2", SND_SOC_NOPM, 1, 0, adder2,
+			   ARRAY_SIZE(adder2)),
+	SND_SOC_DAPM_MIXER("Adder3", SND_SOC_NOPM, 1, 0, adder3,
+			   ARRAY_SIZE(adder3)),
+	SND_SOC_DAPM_MIXER("Adder4", SND_SOC_NOPM, 1, 0, adder4,
+			   ARRAY_SIZE(adder4)),
+	SND_SOC_DAPM_MIXER("Adder5", SND_SOC_NOPM, 1, 0, adder5,
+			   ARRAY_SIZE(adder5)),
+};
+
+#define RX_ROUTES(id, sname)						   \
+	{ "RX" #id " XBAR-" sname,	NULL,	"RX" #id " XBAR-TX" },	   \
+	{ "RX" #id "-CIF-" sname,	NULL,	"RX" #id " XBAR-" sname }, \
+	{ "RX" #id,			NULL,	"RX" #id "-CIF-" sname }
+
+#define MIXER_RX_ROUTES(id)		\
+	RX_ROUTES(id, "Playback"),	\
+	RX_ROUTES(id, "Capture")
+
+#define ADDER_ROUTES(id, sname)						  \
+	{ "Adder" #id,			"RX1",	"RX1" },		  \
+	{ "Adder" #id,			"RX2",	"RX2" },		  \
+	{ "Adder" #id,			"RX3",	"RX3" },		  \
+	{ "Adder" #id,			"RX4",	"RX4" },		  \
+	{ "Adder" #id,			"RX5",	"RX5" },		  \
+	{ "Adder" #id,			"RX6",	"RX6" },		  \
+	{ "Adder" #id,			"RX7",	"RX7" },		  \
+	{ "Adder" #id,			"RX8",	"RX8" },		  \
+	{ "Adder" #id,			"RX9",	"RX9" },		  \
+	{ "Adder" #id,			"RX10",	"RX10" },		  \
+	{ "TX" #id,			NULL,	"Adder" #id },		  \
+	{ "TX" #id "-CIF-" sname,	NULL,	"TX" #id },		  \
+	{ "TX" #id " XBAR-" sname,	NULL,	"TX" #id "-CIF-" sname }, \
+	{ "TX" #id " XBAR-RX",		NULL,	"TX" #id " XBAR-" sname } \
+
+#define TX_ROUTES(id, sname)		\
+	ADDER_ROUTES(1, sname),		\
+	ADDER_ROUTES(2, sname),		\
+	ADDER_ROUTES(3, sname),		\
+	ADDER_ROUTES(4, sname),		\
+	ADDER_ROUTES(5, sname)
+
+#define MIXER_TX_ROUTES(id)		\
+	TX_ROUTES(id, "Playback"),	\
+	TX_ROUTES(id, "Capture")
+
+static const struct snd_soc_dapm_route tegra210_mixer_routes[] = {
+	/* Input */
+	MIXER_RX_ROUTES(1),
+	MIXER_RX_ROUTES(2),
+	MIXER_RX_ROUTES(3),
+	MIXER_RX_ROUTES(4),
+	MIXER_RX_ROUTES(5),
+	MIXER_RX_ROUTES(6),
+	MIXER_RX_ROUTES(7),
+	MIXER_RX_ROUTES(8),
+	MIXER_RX_ROUTES(9),
+	MIXER_RX_ROUTES(10),
+	/* Output */
+	MIXER_TX_ROUTES(1),
+	MIXER_TX_ROUTES(2),
+	MIXER_TX_ROUTES(3),
+	MIXER_TX_ROUTES(4),
+	MIXER_TX_ROUTES(5),
+};
+
+static const struct snd_soc_component_driver tegra210_mixer_cmpnt = {
+	.dapm_widgets		= tegra210_mixer_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(tegra210_mixer_widgets),
+	.dapm_routes		= tegra210_mixer_routes,
+	.num_dapm_routes	= ARRAY_SIZE(tegra210_mixer_routes),
+	.controls		= tegra210_mixer_gain_ctls,
+	.num_controls		= ARRAY_SIZE(tegra210_mixer_gain_ctls),
+};
+
+static bool tegra210_mixer_wr_reg(struct device *dev,
+				unsigned int reg)
+{
+	if (reg < TEGRA210_MIXER_RX_LIMIT)
+		reg = MIXER_REG_BASE(reg);
+	else if (reg < TEGRA210_MIXER_TX_LIMIT)
+		reg = MIXER_REG_BASE(reg) + TEGRA210_MIXER_TX1_ENABLE;
+
+	switch (reg) {
+	case TEGRA210_MIXER_RX1_SOFT_RESET:
+	case TEGRA210_MIXER_RX1_CIF_CTRL ... TEGRA210_MIXER_RX1_PEAK_CTRL:
+
+	case TEGRA210_MIXER_TX1_ENABLE:
+	case TEGRA210_MIXER_TX1_SOFT_RESET:
+	case TEGRA210_MIXER_TX1_INT_MASK ... TEGRA210_MIXER_TX1_ADDER_CONFIG:
+
+	case TEGRA210_MIXER_ENABLE ... TEGRA210_MIXER_CG:
+	case TEGRA210_MIXER_GAIN_CFG_RAM_CTRL ... TEGRA210_MIXER_CTRL:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool tegra210_mixer_rd_reg(struct device *dev,
+				unsigned int reg)
+{
+	if (reg < TEGRA210_MIXER_RX_LIMIT)
+		reg = MIXER_REG_BASE(reg);
+	else if (reg < TEGRA210_MIXER_TX_LIMIT)
+		reg = MIXER_REG_BASE(reg) + TEGRA210_MIXER_TX1_ENABLE;
+
+	switch (reg) {
+	case TEGRA210_MIXER_RX1_SOFT_RESET ... TEGRA210_MIXER_RX1_SAMPLE_COUNT:
+	case TEGRA210_MIXER_TX1_ENABLE ... TEGRA210_MIXER_TX1_ADDER_CONFIG:
+	case TEGRA210_MIXER_ENABLE ... TEGRA210_MIXER_CTRL:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool tegra210_mixer_volatile_reg(struct device *dev,
+				unsigned int reg)
+{
+	if (reg < TEGRA210_MIXER_RX_LIMIT)
+		reg = MIXER_REG_BASE(reg);
+	else if (reg < TEGRA210_MIXER_TX_LIMIT)
+		reg = MIXER_REG_BASE(reg) + TEGRA210_MIXER_TX1_ENABLE;
+
+	switch (reg) {
+	case TEGRA210_MIXER_RX1_SOFT_RESET:
+	case TEGRA210_MIXER_RX1_STATUS:
+
+	case TEGRA210_MIXER_TX1_SOFT_RESET:
+	case TEGRA210_MIXER_TX1_STATUS:
+	case TEGRA210_MIXER_TX1_INT_STATUS:
+	case TEGRA210_MIXER_TX1_INT_SET:
+
+	case TEGRA210_MIXER_SOFT_RESET:
+	case TEGRA210_MIXER_STATUS:
+	case TEGRA210_MIXER_INT_STATUS:
+	case TEGRA210_MIXER_GAIN_CFG_RAM_CTRL:
+	case TEGRA210_MIXER_GAIN_CFG_RAM_DATA:
+	case TEGRA210_MIXER_PEAKM_RAM_CTRL:
+	case TEGRA210_MIXER_PEAKM_RAM_DATA:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool tegra210_mixer_precious_reg(struct device *dev,
+				unsigned int reg)
+{
+	switch (reg) {
+	case TEGRA210_MIXER_GAIN_CFG_RAM_DATA:
+	case TEGRA210_MIXER_PEAKM_RAM_DATA:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config tegra210_mixer_regmap_config = {
+	.reg_bits		= 32,
+	.reg_stride		= 4,
+	.val_bits		= 32,
+	.max_register		= TEGRA210_MIXER_CTRL,
+	.writeable_reg		= tegra210_mixer_wr_reg,
+	.readable_reg		= tegra210_mixer_rd_reg,
+	.volatile_reg		= tegra210_mixer_volatile_reg,
+	.precious_reg		= tegra210_mixer_precious_reg,
+	.reg_defaults		= tegra210_mixer_reg_defaults,
+	.num_reg_defaults	= ARRAY_SIZE(tegra210_mixer_reg_defaults),
+	.cache_type		= REGCACHE_FLAT,
+};
+
+static const struct of_device_id tegra210_mixer_of_match[] = {
+	{ .compatible = "nvidia,tegra210-amixer" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, tegra210_mixer_of_match);
+
+static int tegra210_mixer_platform_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct tegra210_mixer *mixer;
+	void __iomem *regs;
+	int err, i;
+
+	mixer = devm_kzalloc(dev, sizeof(*mixer), GFP_KERNEL);
+	if (!mixer)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, mixer);
+
+	/* Use default gain value for all MIXER inputs */
+	for (i = 0; i < TEGRA210_MIXER_RX_MAX; i++)
+		mixer->gain_value[i] = gain_params.gain_value;
+
+	regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	mixer->regmap = devm_regmap_init_mmio(dev, regs,
+					      &tegra210_mixer_regmap_config);
+	if (IS_ERR(mixer->regmap)) {
+		dev_err(dev, "regmap init failed\n");
+		return PTR_ERR(mixer->regmap);
+	}
+
+	regcache_cache_only(mixer->regmap, true);
+
+	err = devm_snd_soc_register_component(dev, &tegra210_mixer_cmpnt,
+					      tegra210_mixer_dais,
+					      ARRAY_SIZE(tegra210_mixer_dais));
+	if (err) {
+		dev_err(dev, "can't register MIXER component, err: %d\n", err);
+		return err;
+	}
+
+	pm_runtime_enable(dev);
+
+	return 0;
+}
+
+static int tegra210_mixer_platform_remove(struct platform_device *pdev)
+{
+	pm_runtime_disable(&pdev->dev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops tegra210_mixer_pm_ops = {
+	SET_RUNTIME_PM_OPS(tegra210_mixer_runtime_suspend,
+			   tegra210_mixer_runtime_resume, NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
+};
+
+static struct platform_driver tegra210_mixer_driver = {
+	.driver = {
+		.name = "tegra210_mixer",
+		.of_match_table = tegra210_mixer_of_match,
+		.pm = &tegra210_mixer_pm_ops,
+	},
+	.probe = tegra210_mixer_platform_probe,
+	.remove = tegra210_mixer_platform_remove,
+};
+module_platform_driver(tegra210_mixer_driver);
+
+MODULE_AUTHOR("Arun Shamanna Lakshmi <aruns@nvidia.com>");
+MODULE_DESCRIPTION("Tegra210 MIXER ASoC driver");
+MODULE_LICENSE("GPL v2");