Merge remote-tracking branches 'asoc/topic/ssm2518', 'asoc/topic/sta529',...

Merge remote-tracking branches 'asoc/topic/ssm2518', 'asoc/topic/sta529', 'asoc/topic/sti' and 'asoc/topic/sti-sas' into asoc-next

Documentation/devicetree/bindings/sound/st,sti-asoc-card.txt

+STMicroelectronics sti ASoC cards
+
+The sti ASoC Sound Card can be used, for all sti SoCs using internal sti-sas
+codec or external codecs.
+
+sti sound drivers allows to expose sti SoC audio interface through the
+generic ASoC simple card. For details about sound card declaration please refer to
+Documentation/devicetree/bindings/sound/simple-card.txt.
+
+1) sti-uniperiph-dai: audio dai device.
+---------------------------------------
+
+Required properties:
+  - compatible: "st,sti-uni-player" or "st,sti-uni-reader"
+
+  - st,syscfg: phandle to boot-device system configuration registers
+
+  - clock-names: name of the clocks listed in clocks property in the same order
+
+  - reg: CPU DAI IP Base address and size entries, listed  in same
+	 order than the CPU_DAI properties.
+
+  - reg-names: names of the mapped memory regions listed in regs property in
+	       the same order.
+
+  - interrupts: CPU_DAI interrupt line, listed in the same order than the
+		CPU_DAI properties.
+
+  - dma: CPU_DAI DMA controller phandle and DMA request line, listed in the same
+	 order than the CPU_DAI properties.
+
+  - dma-names: identifier string for each DMA request line in the dmas property.
+	"tx" for "st,sti-uni-player" compatibility
+	"rx" for "st,sti-uni-reader" compatibility
+
+  - version: IP version integrated in SOC.
+
+  - dai-name: DAI name that describes the IP.
+
+Required properties ("st,sti-uni-player" compatibility only):
+  - clocks: CPU_DAI IP clock source, listed in the same order than the
+	    CPU_DAI properties.
+
+  - uniperiph-id: internal SOC IP instance ID.
+
+  - IP mode: IP working mode depending on associated codec.
+	"HDMI" connected to HDMI codec IP and IEC HDMI formats.
+	"SPDIF"connected to SPDIF codec and support SPDIF formats.
+	"PCM"  PCM standard mode for I2S or TDM bus.
+
+Optional properties:
+  - pinctrl-0: defined for CPU_DAI@1 and CPU_DAI@4 to describe I2S PIOs for
+	       external codecs connection.
+
+  - pinctrl-names: should contain only one value - "default".
+
+Example:
+
+	sti_uni_player2: sti-uni-player@2 {
+		compatible = "st,sti-uni-player";
+		status = "okay";
+		#sound-dai-cells = <0>;
+		st,syscfg = <&syscfg_core>;
+		clocks = <&clk_s_d0_flexgen CLK_PCM_2>;
+		reg = <0x8D82000 0x158>;
+		interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>;
+		dmas = <&fdma0 4 0 1>;
+		dai-name = "Uni Player #1 (DAC)";
+		dma-names = "tx";
+		uniperiph-id = <2>;
+		version = <5>;
+		mode = "PCM";
+	};
+
+	sti_uni_player3: sti-uni-player@3 {
+		compatible = "st,sti-uni-player";
+		status = "okay";
+		#sound-dai-cells = <0>;
+		st,syscfg = <&syscfg_core>;
+		clocks = <&clk_s_d0_flexgen CLK_SPDIFF>;
+		reg = <0x8D85000 0x158>;
+		interrupts = <GIC_SPI 89 IRQ_TYPE_NONE>;
+		dmas = <&fdma0 7 0 1>;
+		dma-names = "tx";
+		dai-name = "Uni Player #1 (PIO)";
+		uniperiph-id = <3>;
+		version = <5>;
+		mode = "SPDIF";
+	};
+
+	sti_uni_reader1: sti-uni-reader@1 {
+		compatible = "st,sti-uni-reader";
+		status = "disabled";
+		#sound-dai-cells = <0>;
+		st,syscfg = <&syscfg_core>;
+		reg = <0x8D84000 0x158>;
+		interrupts = <GIC_SPI 88 IRQ_TYPE_NONE>;
+		dmas = <&fdma0 6 0 1>;
+		dma-names = "rx";
+		dai-name = "Uni Reader #1 (HDMI RX)";
+		version = <3>;
+	};
+
+2) sti-sas-codec: internal audio codec IPs driver
+-------------------------------------------------
+
+Required properties:
+  - compatible: "st,sti<chip>-sas-codec" .
+	Should be chip "st,stih416-sas-codec" or "st,stih407-sas-codec"
+
+  - st,syscfg: phandle to boot-device system configuration registers.
+
+  - pinctrl-0: SPDIF PIO description.
+
+  - pinctrl-names: should contain only one value - "default".
+
+Example:
+	sti_sas_codec: sti-sas-codec {
+		compatible = "st,stih407-sas-codec";
+		#sound-dai-cells = <1>;
+		st,reg_audio = <&syscfg_core>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_spdif_out >;
+	};
+
+Example of audio card declaration:
+	sound {
+		compatible = "simple-audio-card";
+		simple-audio-card,name = "sti audio card";
+		status = "okay";
+
+		simple-audio-card,dai-link@0 {
+			/* DAC */
+			format = "i2s";
+			dai-tdm-slot-width = <32>;
+			cpu {
+				sound-dai = <&sti_uni_player2>;
+			};
+
+			codec {
+				sound-dai = <&sti_sasg_codec 1>;
+			};
+		};
+		simple-audio-card,dai-link@1 {
+			/* SPDIF */
+			format = "left_j";
+			cpu {
+				sound-dai = <&sti_uni_player3>;
+			};
+
+			codec {
+				sound-dai = <&sti_sasg_codec 0>;
+			};
+		};
+	};

sound/soc/Kconfig

@@ -57,6 +57,7 @@ source "sound/soc/samsung/Kconfig"
 source "sound/soc/sh/Kconfig"
 source "sound/soc/sirf/Kconfig"
 source "sound/soc/spear/Kconfig"
+source "sound/soc/sti/Kconfig"
 source "sound/soc/tegra/Kconfig"
 source "sound/soc/txx9/Kconfig"
 source "sound/soc/ux500/Kconfig"

sound/soc/Makefile

@@ -39,6 +39,7 @@ obj-$(CONFIG_SND_SOC)	+= samsung/
 obj-$(CONFIG_SND_SOC)	+= sh/
 obj-$(CONFIG_SND_SOC)	+= sirf/
 obj-$(CONFIG_SND_SOC)	+= spear/
+obj-$(CONFIG_SND_SOC)	+= sti/
 obj-$(CONFIG_SND_SOC)	+= tegra/
 obj-$(CONFIG_SND_SOC)	+= txx9/
 obj-$(CONFIG_SND_SOC)	+= ux500/

sound/soc/codecs/Kconfig

@@ -106,6 +106,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_STA350 if I2C
 	select SND_SOC_STA529 if I2C
 	select SND_SOC_STAC9766 if SND_SOC_AC97_BUS
+	select SND_SOC_STI_SAS
 	select SND_SOC_TAS2552 if I2C
 	select SND_SOC_TAS5086 if I2C
 	select SND_SOC_TAS571X if I2C
@@ -631,6 +632,9 @@ config SND_SOC_STA529
 config SND_SOC_STAC9766
 	tristate
 
+config SND_SOC_STI_SAS
+	tristate "codec Audio support for STI SAS codec"
+
 config SND_SOC_TAS2552
 	tristate "Texas Instruments TAS2552 Mono Audio amplifier"
 	depends on I2C

sound/soc/codecs/Makefile

@@ -110,6 +110,7 @@ snd-soc-sta32x-objs := sta32x.o
 snd-soc-sta350-objs := sta350.o
 snd-soc-sta529-objs := sta529.o
 snd-soc-stac9766-objs := stac9766.o
+snd-soc-sti-sas-objs := sti-sas.o
 snd-soc-tas5086-objs := tas5086.o
 snd-soc-tas571x-objs := tas571x.o
 snd-soc-tfa9879-objs := tfa9879.o
@@ -297,6 +298,7 @@ obj-$(CONFIG_SND_SOC_STA32X)   += snd-soc-sta32x.o
 obj-$(CONFIG_SND_SOC_STA350)   += snd-soc-sta350.o
 obj-$(CONFIG_SND_SOC_STA529)   += snd-soc-sta529.o
 obj-$(CONFIG_SND_SOC_STAC9766)	+= snd-soc-stac9766.o
+obj-$(CONFIG_SND_SOC_STI_SAS)	+= snd-soc-sti-sas.o
 obj-$(CONFIG_SND_SOC_TAS2552)	+= snd-soc-tas2552.o
 obj-$(CONFIG_SND_SOC_TAS5086)	+= snd-soc-tas5086.o
 obj-$(CONFIG_SND_SOC_TAS571X)	+= snd-soc-tas571x.o

sound/soc/codecs/ssm2518.c

@@ -806,6 +806,14 @@ static int ssm2518_i2c_remove(struct i2c_client *client)
 	return 0;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id ssm2518_dt_ids[] = {
+	{ .compatible = "adi,ssm2518", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ssm2518_dt_ids);
+#endif
+
 static const struct i2c_device_id ssm2518_i2c_ids[] = {
 	{ "ssm2518", 0 },
 	{ }
@@ -815,6 +823,7 @@ MODULE_DEVICE_TABLE(i2c, ssm2518_i2c_ids);
 static struct i2c_driver ssm2518_driver = {
 	.driver = {
 		.name = "ssm2518",
+		.of_match_table = of_match_ptr(ssm2518_dt_ids),
 	},
 	.probe = ssm2518_i2c_probe,
 	.remove = ssm2518_i2c_remove,

sound/soc/codecs/sta529.c

@@ -339,9 +339,6 @@ static int sta529_i2c_probe(struct i2c_client *i2c,
 	struct sta529 *sta529;
 	int ret;
 
-	if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
-		return -EINVAL;
-
 	sta529 = devm_kzalloc(&i2c->dev, sizeof(struct sta529), GFP_KERNEL);
 	if (!sta529)
 		return -ENOMEM;

sound/soc/codecs/sti-sas.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/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/mfd/syscon.h>
+
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+/* chipID supported */
+#define CHIPID_STIH416 0
+#define CHIPID_STIH407 1
+
+/* DAC definitions */
+
+/* stih416 DAC registers */
+/* sysconf 2517: Audio-DAC-Control */
+#define STIH416_AUDIO_DAC_CTRL 0x00000814
+/* sysconf 2519: Audio-Gue-Control */
+#define STIH416_AUDIO_GLUE_CTRL 0x0000081C
+
+#define STIH416_DAC_NOT_STANDBY	0x3
+#define STIH416_DAC_SOFTMUTE	0x4
+#define STIH416_DAC_ANA_NOT_PWR	0x5
+#define STIH416_DAC_NOT_PNDBG	0x6
+
+#define STIH416_DAC_NOT_STANDBY_MASK	BIT(STIH416_DAC_NOT_STANDBY)
+#define STIH416_DAC_SOFTMUTE_MASK	BIT(STIH416_DAC_SOFTMUTE)
+#define STIH416_DAC_ANA_NOT_PWR_MASK	BIT(STIH416_DAC_ANA_NOT_PWR)
+#define STIH416_DAC_NOT_PNDBG_MASK	BIT(STIH416_DAC_NOT_PNDBG)
+
+/* stih407 DAC registers */
+/* sysconf 5041: Audio-Gue-Control */
+#define STIH407_AUDIO_GLUE_CTRL 0x000000A4
+/* sysconf 5042: Audio-DAC-Control */
+#define STIH407_AUDIO_DAC_CTRL 0x000000A8
+
+/* DAC definitions */
+#define STIH407_DAC_SOFTMUTE		0x0
+#define STIH407_DAC_STANDBY_ANA		0x1
+#define STIH407_DAC_STANDBY		0x2
+
+#define STIH407_DAC_SOFTMUTE_MASK	BIT(STIH407_DAC_SOFTMUTE)
+#define STIH407_DAC_STANDBY_ANA_MASK    BIT(STIH407_DAC_STANDBY_ANA)
+#define STIH407_DAC_STANDBY_MASK        BIT(STIH407_DAC_STANDBY)
+
+/* SPDIF definitions */
+#define SPDIF_BIPHASE_ENABLE		0x6
+#define SPDIF_BIPHASE_IDLE		0x7
+
+#define SPDIF_BIPHASE_ENABLE_MASK	BIT(SPDIF_BIPHASE_ENABLE)
+#define SPDIF_BIPHASE_IDLE_MASK		BIT(SPDIF_BIPHASE_IDLE)
+
+enum {
+	STI_SAS_DAI_SPDIF_OUT,
+	STI_SAS_DAI_ANALOG_OUT,
+};
+
+static const struct reg_default stih416_sas_reg_defaults[] = {
+	{ STIH407_AUDIO_GLUE_CTRL, 0x00000040 },
+	{ STIH407_AUDIO_DAC_CTRL, 0x000000000 },
+};
+
+static const struct reg_default stih407_sas_reg_defaults[] = {
+	{ STIH416_AUDIO_DAC_CTRL, 0x000000000 },
+	{ STIH416_AUDIO_GLUE_CTRL, 0x00000040 },
+};
+
+struct sti_dac_audio {
+	struct regmap *regmap;
+	struct regmap *virt_regmap;
+	struct regmap_field  **field;
+	struct reset_control *rst;
+	int mclk;
+};
+
+struct sti_spdif_audio {
+	struct regmap *regmap;
+	struct regmap_field  **field;
+	int mclk;
+};
+
+/* device data structure */
+struct sti_sas_dev_data {
+	const int chipid; /* IC version */
+	const struct regmap_config *regmap;
+	const struct snd_soc_dai_ops *dac_ops;  /* DAC function callbacks */
+	const struct snd_soc_dapm_widget *dapm_widgets; /* dapms declaration */
+	const int num_dapm_widgets; /* dapms declaration */
+	const struct snd_soc_dapm_route *dapm_routes; /* route declaration */
+	const int num_dapm_routes; /* route declaration */
+};
+
+/* driver data structure */
+struct sti_sas_data {
+	struct device *dev;
+	const struct sti_sas_dev_data *dev_data;
+	struct sti_dac_audio dac;
+	struct sti_spdif_audio spdif;
+};
+
+/* Read a register from the sysconf reg bank */
+static int sti_sas_read_reg(void *context, unsigned int reg,
+			    unsigned int *value)
+{
+	struct sti_sas_data *drvdata = context;
+	int status;
+	u32 val;
+
+	status = regmap_read(drvdata->dac.regmap, reg, &val);
+	*value = (unsigned int)val;
+
+	return status;
+}
+
+/* Read a register from the sysconf reg bank */
+static int sti_sas_write_reg(void *context, unsigned int reg,
+			     unsigned int value)
+{
+	struct sti_sas_data *drvdata = context;
+	int status;
+
+	status = regmap_write(drvdata->dac.regmap, reg, value);
+
+	return status;
+}
+
+static int  sti_sas_init_sas_registers(struct snd_soc_codec *codec,
+				       struct sti_sas_data *data)
+{
+	int ret;
+	/*
+	 * DAC and SPDIF are activated by default
+	 * put them in IDLE to save power
+	 */
+
+	/* Initialise bi-phase formatter to disabled */
+	ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+				  SPDIF_BIPHASE_ENABLE_MASK, 0);
+
+	if (!ret)
+		/* Initialise bi-phase formatter idle value to 0 */
+		ret = snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+					  SPDIF_BIPHASE_IDLE_MASK, 0);
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to update SPDIF registers");
+		return ret;
+	}
+
+	/* Init DAC configuration */
+	switch (data->dev_data->chipid) {
+	case CHIPID_STIH407:
+		/* init configuration */
+		ret =  snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+					   STIH407_DAC_STANDBY_MASK,
+					   STIH407_DAC_STANDBY_MASK);
+
+		if (!ret)
+			ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+						  STIH407_DAC_STANDBY_ANA_MASK,
+						  STIH407_DAC_STANDBY_ANA_MASK);
+		if (!ret)
+			ret = snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+						  STIH407_DAC_SOFTMUTE_MASK,
+						  STIH407_DAC_SOFTMUTE_MASK);
+		break;
+	case CHIPID_STIH416:
+		ret =  snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
+					   STIH416_DAC_NOT_STANDBY_MASK, 0);
+		if (!ret)
+			ret =  snd_soc_update_bits(codec,
+						   STIH416_AUDIO_DAC_CTRL,
+						   STIH416_DAC_ANA_NOT_PWR, 0);
+		if (!ret)
+			ret =  snd_soc_update_bits(codec,
+						   STIH416_AUDIO_DAC_CTRL,
+						   STIH416_DAC_NOT_PNDBG_MASK,
+						   0);
+		if (!ret)
+			ret =  snd_soc_update_bits(codec,
+						   STIH416_AUDIO_DAC_CTRL,
+						   STIH416_DAC_SOFTMUTE_MASK,
+						   STIH416_DAC_SOFTMUTE_MASK);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (ret < 0) {
+		dev_err(codec->dev, "Failed to update DAC registers");
+		return ret;
+	}
+
+	return ret;
+}
+
+/*
+ * DAC
+ */
+static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+	/* Sanity check only */
+	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+		dev_err(dai->codec->dev,
+			"%s: ERROR: Unsupporter master mask 0x%x\n",
+			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int stih416_dac_probe(struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+	struct sti_dac_audio *dac = &drvdata->dac;
+
+	/* Get reset control */
+	dac->rst = devm_reset_control_get(codec->dev, "dac_rst");
+	if (IS_ERR(dac->rst)) {
+		dev_err(dai->codec->dev,
+			"%s: ERROR: DAC reset control not defined !\n",
+			__func__);
+		dac->rst = NULL;
+		return -EFAULT;
+	}
+	/* Put the DAC into reset */
+	reset_control_assert(dac->rst);
+
+	return 0;
+}
+
+static const struct snd_soc_dapm_widget stih416_sas_dapm_widgets[] = {
+	SND_SOC_DAPM_PGA("DAC bandgap", STIH416_AUDIO_DAC_CTRL,
+			 STIH416_DAC_NOT_PNDBG_MASK, 0, NULL, 0),
+	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH416_AUDIO_DAC_CTRL,
+			     STIH416_DAC_ANA_NOT_PWR, 0, NULL, 0),
+	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH416_AUDIO_DAC_CTRL,
+			 STIH416_DAC_NOT_STANDBY, 0),
+	SND_SOC_DAPM_OUTPUT("DAC Output"),
+};
+
+static const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = {
+	SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL,
+			     STIH407_DAC_STANDBY_ANA, 1, NULL, 0),
+	SND_SOC_DAPM_DAC("DAC standby",  "dac_p", STIH407_AUDIO_DAC_CTRL,
+			 STIH407_DAC_STANDBY, 1),
+	SND_SOC_DAPM_OUTPUT("DAC Output"),
+};
+
+static const struct snd_soc_dapm_route stih416_sas_route[] = {
+	{"DAC Output", NULL, "DAC bandgap"},
+	{"DAC Output", NULL, "DAC standby ana"},
+	{"DAC standby ana", NULL, "DAC standby"},
+};
+
+static const struct snd_soc_dapm_route stih407_sas_route[] = {
+	{"DAC Output", NULL, "DAC standby ana"},
+	{"DAC standby ana", NULL, "DAC standby"},
+};
+
+static int stih416_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
+{
+	struct snd_soc_codec *codec = dai->codec;
+
+	if (mute) {
+		return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
+					    STIH416_DAC_SOFTMUTE_MASK,
+					    STIH416_DAC_SOFTMUTE_MASK);
+	} else {
+		return snd_soc_update_bits(codec, STIH416_AUDIO_DAC_CTRL,
+					    STIH416_DAC_SOFTMUTE_MASK, 0);
+	}
+}
+
+static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
+{
+	struct snd_soc_codec *codec = dai->codec;
+
+	if (mute) {
+		return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+					    STIH407_DAC_SOFTMUTE_MASK,
+					    STIH407_DAC_SOFTMUTE_MASK);
+	} else {
+		return snd_soc_update_bits(codec, STIH407_AUDIO_DAC_CTRL,
+					    STIH407_DAC_SOFTMUTE_MASK,
+					    0);
+	}
+}
+
+/*
+ * SPDIF
+ */
+static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai,
+				 unsigned int fmt)
+{
+	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
+		dev_err(dai->codec->dev,
+			"%s: ERROR: Unsupporter master mask 0x%x\n",
+			__func__, fmt & SND_SOC_DAIFMT_MASTER_MASK);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/*
+ * sti_sas_spdif_trigger:
+ * Trigger function is used to ensure that BiPhase Formater is disabled
+ * before CPU dai is stopped.
+ * This is mandatory to avoid that BPF is stalled
+ */
+static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+				 struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+					    SPDIF_BIPHASE_ENABLE_MASK,
+					    SPDIF_BIPHASE_ENABLE_MASK);
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		return snd_soc_update_bits(codec, STIH407_AUDIO_GLUE_CTRL,
+					    SPDIF_BIPHASE_ENABLE_MASK,
+					    0);
+	default:
+		return -EINVAL;
+	}
+}
+
+static bool sti_sas_volatile_register(struct device *dev, unsigned int reg)
+{
+	if (reg == STIH407_AUDIO_GLUE_CTRL)
+		return true;
+
+	return false;
+}
+
+/*
+ * CODEC DAIS
+ */
+
+/*
+ * sti_sas_set_sysclk:
+ * get MCLK input frequency to check that MCLK-FS ratio is coherent
+ */
+static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id,
+			      unsigned int freq, int dir)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+
+	if (dir == SND_SOC_CLOCK_OUT)
+		return 0;
+
+	if (clk_id != 0)
+		return -EINVAL;
+
+	switch (dai->id) {
+	case STI_SAS_DAI_SPDIF_OUT:
+		drvdata->spdif.mclk = freq;
+		break;
+
+	case STI_SAS_DAI_ANALOG_OUT:
+		drvdata->dac.mclk = freq;
+		break;
+	}
+
+	return 0;
+}
+
+static int sti_sas_prepare(struct snd_pcm_substream *substream,
+			   struct snd_soc_dai *dai)
+{
+	struct snd_soc_codec *codec = dai->codec;
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	switch (dai->id) {
+	case STI_SAS_DAI_SPDIF_OUT:
+		if ((drvdata->spdif.mclk / runtime->rate) != 128) {
+			dev_err(codec->dev, "unexpected mclk-fs ratio");
+			return -EINVAL;
+		}
+		break;
+	case STI_SAS_DAI_ANALOG_OUT:
+		if ((drvdata->dac.mclk / runtime->rate) != 256) {
+			dev_err(codec->dev, "unexpected mclk-fs ratio");
+			return -EINVAL;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops stih416_dac_ops = {
+	.set_fmt = sti_sas_dac_set_fmt,
+	.mute_stream = stih416_sas_dac_mute,
+	.prepare = sti_sas_prepare,
+	.set_sysclk = sti_sas_set_sysclk,
+};
+
+static const struct snd_soc_dai_ops stih407_dac_ops = {
+	.set_fmt = sti_sas_dac_set_fmt,
+	.mute_stream = stih407_sas_dac_mute,
+	.prepare = sti_sas_prepare,
+	.set_sysclk = sti_sas_set_sysclk,
+};
+
+static const struct regmap_config stih407_sas_regmap = {
+	.reg_bits = 32,
+	.val_bits = 32,
+
+	.max_register = STIH407_AUDIO_DAC_CTRL,
+	.reg_defaults = stih407_sas_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults),
+	.volatile_reg = sti_sas_volatile_register,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_read = sti_sas_read_reg,
+	.reg_write = sti_sas_write_reg,
+};
+
+static const struct regmap_config stih416_sas_regmap = {
+	.reg_bits = 32,
+	.val_bits = 32,
+
+	.max_register = STIH416_AUDIO_DAC_CTRL,
+	.reg_defaults = stih416_sas_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(stih416_sas_reg_defaults),
+	.volatile_reg = sti_sas_volatile_register,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_read = sti_sas_read_reg,
+	.reg_write = sti_sas_write_reg,
+};
+
+static const struct sti_sas_dev_data stih416_data = {
+	.chipid = CHIPID_STIH416,
+	.regmap = &stih416_sas_regmap,
+	.dac_ops = &stih416_dac_ops,
+	.dapm_widgets = stih416_sas_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(stih416_sas_dapm_widgets),
+	.dapm_routes =	stih416_sas_route,
+	.num_dapm_routes = ARRAY_SIZE(stih416_sas_route),
+};
+
+static const struct sti_sas_dev_data stih407_data = {
+	.chipid = CHIPID_STIH407,
+	.regmap = &stih407_sas_regmap,
+	.dac_ops = &stih407_dac_ops,
+	.dapm_widgets = stih407_sas_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets),
+	.dapm_routes =	stih407_sas_route,
+	.num_dapm_routes = ARRAY_SIZE(stih407_sas_route),
+};
+
+static struct snd_soc_dai_driver sti_sas_dai[] = {
+	{
+		.name = "sas-dai-spdif-out",
+		.id = STI_SAS_DAI_SPDIF_OUT,
+		.playback = {
+			.stream_name = "spdif_p",
+			.channels_min = 2,
+			.channels_max = 2,
+			.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
+				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 |
+				 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
+				 SNDRV_PCM_RATE_192000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE |
+				   SNDRV_PCM_FMTBIT_S32_LE,
+		},
+		.ops = (struct snd_soc_dai_ops[]) {
+			{
+				.set_fmt = sti_sas_spdif_set_fmt,
+				.trigger = sti_sas_spdif_trigger,
+				.set_sysclk = sti_sas_set_sysclk,
+				.prepare = sti_sas_prepare,
+			}
+		},
+	},
+	{
+		.name = "sas-dai-dac",
+		.id = STI_SAS_DAI_ANALOG_OUT,
+		.playback = {
+			.stream_name = "dac_p",
+			.channels_min = 2,
+			.channels_max = 2,
+			.rates = SNDRV_PCM_RATE_8000_48000,
+			.formats = SNDRV_PCM_FMTBIT_S16_LE |
+				   SNDRV_PCM_FMTBIT_S32_LE,
+		},
+	},
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int sti_sas_resume(struct snd_soc_codec *codec)
+{
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+
+	return sti_sas_init_sas_registers(codec, drvdata);
+}
+#else
+#define sti_sas_resume NULL
+#endif
+
+static int sti_sas_codec_probe(struct snd_soc_codec *codec)
+{
+	struct sti_sas_data *drvdata = dev_get_drvdata(codec->dev);
+	int ret;
+
+	ret = sti_sas_init_sas_registers(codec, drvdata);
+
+	return ret;
+}
+
+static struct snd_soc_codec_driver sti_sas_driver = {
+	.probe = sti_sas_codec_probe,
+	.resume = sti_sas_resume,
+};
+
+static const struct of_device_id sti_sas_dev_match[] = {
+	{
+		.compatible = "st,stih416-sas-codec",
+		.data = &stih416_data,
+	},
+	{
+		.compatible = "st,stih407-sas-codec",
+		.data = &stih407_data,
+	},
+	{},
+};
+
+static int sti_sas_driver_probe(struct platform_device *pdev)
+{
+	struct device_node *pnode = pdev->dev.of_node;
+	struct sti_sas_data *drvdata;
+	const struct of_device_id *of_id;
+
+	/* Allocate device structure */
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data),
+			       GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	/* Populate data structure depending on compatibility */
+	of_id = of_match_node(sti_sas_dev_match, pnode);
+	if (!of_id->data) {
+		dev_err(&pdev->dev, "data associated to device is missing");
+		return -EINVAL;
+	}
+
+	drvdata->dev_data = (struct sti_sas_dev_data *)of_id->data;
+
+	/* Initialise device structure */
+	drvdata->dev = &pdev->dev;
+
+	/* Request the DAC & SPDIF registers memory region */
+	drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata,
+						    drvdata->dev_data->regmap);
+	if (IS_ERR(drvdata->dac.virt_regmap)) {
+		dev_err(&pdev->dev, "audio registers not enabled\n");
+		return PTR_ERR(drvdata->dac.virt_regmap);
+	}
+
+	/* Request the syscon region */
+	drvdata->dac.regmap =
+		syscon_regmap_lookup_by_phandle(pnode, "st,syscfg");
+	if (IS_ERR(drvdata->dac.regmap)) {
+		dev_err(&pdev->dev, "syscon registers not available\n");
+		return PTR_ERR(drvdata->dac.regmap);
+	}
+	drvdata->spdif.regmap = drvdata->dac.regmap;
+
+	/* Set DAC dai probe */
+	if (drvdata->dev_data->chipid == CHIPID_STIH416)
+		sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].probe = stih416_dac_probe;
+
+	sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops;
+
+	/* Set dapms*/
+	sti_sas_driver.dapm_widgets = drvdata->dev_data->dapm_widgets;
+	sti_sas_driver.num_dapm_widgets = drvdata->dev_data->num_dapm_widgets;
+
+	sti_sas_driver.dapm_routes = drvdata->dev_data->dapm_routes;
+	sti_sas_driver.num_dapm_routes = drvdata->dev_data->num_dapm_routes;
+
+	/* Store context */
+	dev_set_drvdata(&pdev->dev, drvdata);
+
+	return snd_soc_register_codec(&pdev->dev, &sti_sas_driver,
+					sti_sas_dai,
+					ARRAY_SIZE(sti_sas_dai));
+}
+
+static int sti_sas_driver_remove(struct platform_device *pdev)
+{
+	snd_soc_unregister_codec(&pdev->dev);
+
+	return 0;
+}
+
+static struct platform_driver sti_sas_platform_driver = {
+	.driver = {
+		.name = "sti-sas-codec",
+		.of_match_table = sti_sas_dev_match,
+	},
+	.probe = sti_sas_driver_probe,
+	.remove = sti_sas_driver_remove,
+};
+
+module_platform_driver(sti_sas_platform_driver);
+
+MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms");
+MODULE_AUTHOR("Arnaud.pouliquen@st.com");
+MODULE_LICENSE("GPL v2");

sound/soc/sti/Kconfig

+#
+# STM SoC audio configuration
+#
+menuconfig SND_SOC_STI
+	tristate "SoC Audio support for STI System-On-Chip"
+	depends on SND_SOC
+	depends on ARCH_STI || COMPILE_TEST
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+		Say Y if you want to enable ASoC-support for
+		any of the STI platforms (e.g. STIH416).

sound/soc/sti/Makefile

+# STI platform support
+snd-soc-sti-objs := sti_uniperif.o uniperif_player.o uniperif_reader.o
+
+obj-$(CONFIG_SND_SOC_STI) += snd-soc-sti.o

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 <linux/pinctrl/consumer.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
+ */
+static 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 = devm_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_reader.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/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+
+#include <sound/soc.h>
+
+#include "uniperif.h"
+
+/*
+ * Note: snd_pcm_hardware is linked to DMA controller but is declared here to
+ * integrate unireader capability in term of rate and supported channels
+ */
+static const struct snd_pcm_hardware uni_reader_pcm_hw = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID,
+	.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE,
+
+	.rates = SNDRV_PCM_RATE_CONTINUOUS,
+	.rate_min = 8000,
+	.rate_max = 96000,
+
+	.channels_min = 2,
+	.channels_max = 8,
+
+	.periods_min = 2,
+	.periods_max = 48,
+
+	.period_bytes_min = 128,
+	.period_bytes_max = 64 * PAGE_SIZE,
+	.buffer_bytes_max = 256 * PAGE_SIZE
+};
+
+/*
+ * uni_reader_irq_handler
+ * In case of error audio stream is stopped; stop action is protected via PCM
+ * stream lock  to avoid race condition with trigger callback.
+ */
+static irqreturn_t uni_reader_irq_handler(int irq, void *dev_id)
+{
+	irqreturn_t ret = IRQ_NONE;
+	struct uniperif *reader = dev_id;
+	unsigned int status;
+
+	if (reader->state == UNIPERIF_STATE_STOPPED) {
+		/* Unexpected IRQ: do nothing */
+		dev_warn(reader->dev, "unexpected IRQ ");
+		return IRQ_HANDLED;
+	}
+
+	/* Get interrupt status & clear them immediately */
+	status = GET_UNIPERIF_ITS(reader);
+	SET_UNIPERIF_ITS_BCLR(reader, status);
+
+	/* Check for fifo overflow error */
+	if (unlikely(status & UNIPERIF_ITS_FIFO_ERROR_MASK(reader))) {
+		dev_err(reader->dev, "FIFO error detected");
+
+		snd_pcm_stream_lock(reader->substream);
+		snd_pcm_stop(reader->substream, SNDRV_PCM_STATE_XRUN);
+		snd_pcm_stream_unlock(reader->substream);
+
+		return IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static int uni_reader_prepare(struct snd_pcm_substream *substream,
+			      struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct uniperif *reader = priv->dai_data.uni;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int transfer_size, trigger_limit;
+	int slot_width;
+	int count = 10;
+
+	/* The reader should be stopped */
+	if (reader->state != UNIPERIF_STATE_STOPPED) {
+		dev_err(reader->dev, "%s: invalid reader state %d", __func__,
+			reader->state);
+		return -EINVAL;
+	}
+
+	/* Calculate transfer size (in fifo cells and bytes) for frame count */
+	transfer_size = runtime->channels * UNIPERIF_FIFO_FRAMES;
+
+	/* Calculate number of empty cells available before asserting DREQ */
+	if (reader->ver < SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0)
+		trigger_limit = UNIPERIF_FIFO_SIZE - transfer_size;
+	else
+		/*
+		 * Since SND_ST_UNIPERIF_VERSION_UNI_PLR_TOP_1_0
+		 * FDMA_TRIGGER_LIMIT also controls when the state switches
+		 * from OFF or STANDBY to AUDIO DATA.
+		 */
+		trigger_limit = transfer_size;
+
+	/* Trigger limit must be an even number */
+	if ((!trigger_limit % 2) ||
+	    (trigger_limit != 1 && transfer_size % 2) ||
+	    (trigger_limit > UNIPERIF_CONFIG_DMA_TRIG_LIMIT_MASK(reader))) {
+		dev_err(reader->dev, "invalid trigger limit %d", trigger_limit);
+		return -EINVAL;
+	}
+
+	SET_UNIPERIF_CONFIG_DMA_TRIG_LIMIT(reader, trigger_limit);
+
+	switch (reader->daifmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_IB_IF:
+	case SND_SOC_DAIFMT_NB_IF:
+		SET_UNIPERIF_I2S_FMT_LR_POL_HIG(reader);
+		break;
+	default:
+		SET_UNIPERIF_I2S_FMT_LR_POL_LOW(reader);
+	}
+
+	/* Force slot width to 32 in I2S mode */
+	if ((reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK)
+		== SND_SOC_DAIFMT_I2S) {
+		slot_width = 32;
+	} else {
+		switch (runtime->format) {
+		case SNDRV_PCM_FORMAT_S16_LE:
+			slot_width = 16;
+			break;
+		default:
+			slot_width = 32;
+			break;
+		}
+	}
+
+	/* Number of bits per subframe (i.e one channel sample) on input. */
+	switch (slot_width) {
+	case 32:
+		SET_UNIPERIF_I2S_FMT_NBIT_32(reader);
+		SET_UNIPERIF_I2S_FMT_DATA_SIZE_32(reader);
+		break;
+	case 16:
+		SET_UNIPERIF_I2S_FMT_NBIT_16(reader);
+		SET_UNIPERIF_I2S_FMT_DATA_SIZE_16(reader);
+		break;
+	default:
+		dev_err(reader->dev, "subframe format not supported");
+		return -EINVAL;
+	}
+
+	/* Configure data memory format */
+	switch (runtime->format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		/* One data word contains two samples */
+		SET_UNIPERIF_CONFIG_MEM_FMT_16_16(reader);
+		break;
+
+	case SNDRV_PCM_FORMAT_S32_LE:
+		/*
+		 * Actually "16 bits/0 bits" means "32/28/24/20/18/16 bits
+		 * on the MSB then zeros (if less than 32 bytes)"...
+		 */
+		SET_UNIPERIF_CONFIG_MEM_FMT_16_0(reader);
+		break;
+
+	default:
+		dev_err(reader->dev, "format not supported");
+		return -EINVAL;
+	}
+
+	switch (reader->daifmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+	case SND_SOC_DAIFMT_I2S:
+		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
+		SET_UNIPERIF_I2S_FMT_PADDING_I2S_MODE(reader);
+		break;
+	case SND_SOC_DAIFMT_LEFT_J:
+		SET_UNIPERIF_I2S_FMT_ALIGN_LEFT(reader);
+		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
+		break;
+	case SND_SOC_DAIFMT_RIGHT_J:
+		SET_UNIPERIF_I2S_FMT_ALIGN_RIGHT(reader);
+		SET_UNIPERIF_I2S_FMT_PADDING_SONY_MODE(reader);
+		break;
+	default:
+		dev_err(reader->dev, "format not supported");
+		return -EINVAL;
+	}
+
+	SET_UNIPERIF_I2S_FMT_ORDER_MSB(reader);
+
+	/* Data clocking (changing) on the rising edge */
+	SET_UNIPERIF_I2S_FMT_SCLK_EDGE_RISING(reader);
+
+	/* Number of channels must be even */
+
+	if ((runtime->channels % 2) || (runtime->channels < 2) ||
+	    (runtime->channels > 10)) {
+		dev_err(reader->dev, "%s: invalid nb of channels", __func__);
+		return -EINVAL;
+	}
+
+	SET_UNIPERIF_I2S_FMT_NUM_CH(reader, runtime->channels / 2);
+
+	/* Clear any pending interrupts */
+	SET_UNIPERIF_ITS_BCLR(reader, GET_UNIPERIF_ITS(reader));
+
+	SET_UNIPERIF_I2S_FMT_NO_OF_SAMPLES_TO_READ(reader, 0);
+
+	/* Set the interrupt mask */
+	SET_UNIPERIF_ITM_BSET_DMA_ERROR(reader);
+	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
+	SET_UNIPERIF_ITM_BSET_MEM_BLK_READ(reader);
+
+	/* Enable underflow recovery interrupts */
+	if (reader->info->underflow_enabled) {
+		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_DONE(reader);
+		SET_UNIPERIF_ITM_BSET_UNDERFLOW_REC_FAILED(reader);
+	}
+
+	/* Reset uniperipheral reader */
+	SET_UNIPERIF_SOFT_RST_SOFT_RST(reader);
+
+	while (GET_UNIPERIF_SOFT_RST_SOFT_RST(reader)) {
+		udelay(5);
+		count--;
+	}
+	if (!count) {
+		dev_err(reader->dev, "Failed to reset uniperif");
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int uni_reader_start(struct uniperif *reader)
+{
+	/* The reader should be stopped */
+	if (reader->state != UNIPERIF_STATE_STOPPED) {
+		dev_err(reader->dev, "%s: invalid reader state", __func__);
+		return -EINVAL;
+	}
+
+	/* Enable reader interrupts (and clear possible stalled ones) */
+	SET_UNIPERIF_ITS_BCLR_FIFO_ERROR(reader);
+	SET_UNIPERIF_ITM_BSET_FIFO_ERROR(reader);
+
+	/* Launch the reader */
+	SET_UNIPERIF_CTRL_OPERATION_PCM_DATA(reader);
+
+	/* Update state to started */
+	reader->state = UNIPERIF_STATE_STARTED;
+	return 0;
+}
+
+static int uni_reader_stop(struct uniperif *reader)
+{
+	/* The reader should not be in stopped state */
+	if (reader->state == UNIPERIF_STATE_STOPPED) {
+		dev_err(reader->dev, "%s: invalid reader state", __func__);
+		return -EINVAL;
+	}
+
+	/* Turn the reader off */
+	SET_UNIPERIF_CTRL_OPERATION_OFF(reader);
+
+	/* Disable interrupts */
+	SET_UNIPERIF_ITM_BCLR(reader, GET_UNIPERIF_ITM(reader));
+
+	/* Update state to stopped and return */
+	reader->state = UNIPERIF_STATE_STOPPED;
+
+	return 0;
+}
+
+static int  uni_reader_trigger(struct snd_pcm_substream *substream,
+			       int cmd, struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct uniperif *reader = priv->dai_data.uni;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		return  uni_reader_start(reader);
+	case SNDRV_PCM_TRIGGER_STOP:
+		return  uni_reader_stop(reader);
+	default:
+		return -EINVAL;
+	}
+}
+
+static void uni_reader_shutdown(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct sti_uniperiph_data *priv = snd_soc_dai_get_drvdata(dai);
+	struct uniperif *reader = priv->dai_data.uni;
+
+	if (reader->state != UNIPERIF_STATE_STOPPED) {
+		/* Stop the reader */
+		uni_reader_stop(reader);
+	}
+}
+
+static int uni_reader_parse_dt(struct platform_device *pdev,
+			       struct uniperif *reader)
+{
+	struct uniperif_info *info;
+	struct device_node *node = pdev->dev.of_node;
+
+	/* Allocate memory for the info structure */
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	of_property_read_u32(node, "version", &reader->ver);
+
+	/* Save the info structure */
+	reader->info = info;
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops uni_reader_dai_ops = {
+		.shutdown = uni_reader_shutdown,
+		.prepare = uni_reader_prepare,
+		.trigger = uni_reader_trigger,
+		.hw_params = sti_uniperiph_dai_hw_params,
+		.set_fmt = sti_uniperiph_dai_set_fmt,
+};
+
+int uni_reader_init(struct platform_device *pdev,
+		    struct uniperif *reader)
+{
+	int ret = 0;
+
+	reader->dev = &pdev->dev;
+	reader->state = UNIPERIF_STATE_STOPPED;
+	reader->hw = &uni_reader_pcm_hw;
+	reader->dai_ops = &uni_reader_dai_ops;
+
+	dev_err(reader->dev, "%s: enter\n", __func__);
+	ret = uni_reader_parse_dt(pdev, reader);
+	if (ret < 0) {
+		dev_err(reader->dev, "Failed to parse DeviceTree");
+		return ret;
+	}
+
+	ret = devm_request_irq(&pdev->dev, reader->irq,
+			       uni_reader_irq_handler, IRQF_SHARED,
+			       dev_name(&pdev->dev), reader);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to request IRQ");
+		return -EBUSY;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(uni_reader_init);