Fixed MTP to work with TWRP

sound/soc/spear/Kconfig

@@ -0,0 +1,9 @@
+config SND_SPEAR_SOC
+	tristate
+	select SND_DMAENGINE_PCM
+
+config SND_SPEAR_SPDIF_OUT
+	tristate
+
+config SND_SPEAR_SPDIF_IN
+	tristate

sound/soc/spear/Makefile

@@ -0,0 +1,8 @@
+# SPEAR Platform Support
+snd-soc-spear-pcm-objs := spear_pcm.o
+snd-soc-spear-spdif-in-objs := spdif_in.o
+snd-soc-spear-spdif-out-objs := spdif_out.o
+
+obj-$(CONFIG_SND_SPEAR_SOC) += snd-soc-spear-pcm.o
+obj-$(CONFIG_SND_SPEAR_SPDIF_IN) += snd-soc-spear-spdif-in.o
+obj-$(CONFIG_SND_SPEAR_SPDIF_OUT) += snd-soc-spear-spdif-out.o

sound/soc/spear/spdif_in.c

@@ -0,0 +1,286 @@
+/*
+ * ALSA SoC SPDIF In Audio Layer for spear processors
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Vipin Kumar <vipin.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/spear_dma.h>
+#include <sound/spear_spdif.h>
+#include "spdif_in_regs.h"
+#include "spear_pcm.h"
+
+struct spdif_in_params {
+	u32 format;
+};
+
+struct spdif_in_dev {
+	struct clk *clk;
+	struct spear_dma_data dma_params;
+	struct spdif_in_params saved_params;
+	void *io_base;
+	struct device *dev;
+	void (*reset_perip)(void);
+	int irq;
+	struct snd_dmaengine_dai_dma_data dma_params_rx;
+	struct snd_dmaengine_pcm_config config;
+};
+
+static void spdif_in_configure(struct spdif_in_dev *host)
+{
+	u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN |
+		SPDIF_IN_VALEN | SPDIF_IN_BLKEN;
+	ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16;
+
+	writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+	writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
+}
+
+static int spdif_in_dai_probe(struct snd_soc_dai *dai)
+{
+	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+
+	host->dma_params_rx.filter_data = &host->dma_params;
+	dai->capture_dma_data = &host->dma_params_rx;
+
+	return 0;
+}
+
+static void spdif_in_shutdown(struct snd_pcm_substream *substream,
+		struct snd_soc_dai *dai)
+{
+	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+
+	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+		return;
+
+	writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
+}
+
+static void spdif_in_format(struct spdif_in_dev *host, u32 format)
+{
+	u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL);
+
+	switch (format) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		ctrl |= SPDIF_XTRACT_16BIT;
+		break;
+
+	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
+		ctrl &= ~SPDIF_XTRACT_16BIT;
+		break;
+	}
+
+	writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+}
+
+static int spdif_in_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params,
+		struct snd_soc_dai *dai)
+{
+	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+	u32 format;
+
+	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+		return -EINVAL;
+
+	format = params_format(params);
+	host->saved_params.format = format;
+
+	return 0;
+}
+
+static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
+		struct snd_soc_dai *dai)
+{
+	struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai);
+	u32 ctrl;
+	int ret = 0;
+
+	if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
+		return -EINVAL;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		clk_enable(host->clk);
+		spdif_in_configure(host);
+		spdif_in_format(host, host->saved_params.format);
+
+		ctrl = readl(host->io_base + SPDIF_IN_CTRL);
+		ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB;
+		writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+		writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		ctrl = readl(host->io_base + SPDIF_IN_CTRL);
+		ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB);
+		writel(ctrl, host->io_base + SPDIF_IN_CTRL);
+		writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK);
+
+		if (host->reset_perip)
+			host->reset_perip();
+		clk_disable(host->clk);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static struct snd_soc_dai_ops spdif_in_dai_ops = {
+	.shutdown	= spdif_in_shutdown,
+	.trigger	= spdif_in_trigger,
+	.hw_params	= spdif_in_hw_params,
+};
+
+static struct snd_soc_dai_driver spdif_in_dai = {
+	.probe = spdif_in_dai_probe,
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
+				 SNDRV_PCM_RATE_192000),
+		.formats = SNDRV_PCM_FMTBIT_S16_LE | \
+			   SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE,
+	},
+	.ops = &spdif_in_dai_ops,
+};
+
+static const struct snd_soc_component_driver spdif_in_component = {
+	.name		= "spdif-in",
+};
+
+static irqreturn_t spdif_in_irq(int irq, void *arg)
+{
+	struct spdif_in_dev *host = (struct spdif_in_dev *)arg;
+
+	u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ);
+
+	if (!irq_status)
+		return IRQ_NONE;
+
+	if (irq_status & SPDIF_IRQ_FIFOWRITE)
+		dev_err(host->dev, "spdif in: fifo write error");
+	if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD)
+		dev_err(host->dev, "spdif in: empty fifo read error");
+	if (irq_status & SPDIF_IRQ_FIFOFULL)
+		dev_err(host->dev, "spdif in: fifo full error");
+	if (irq_status & SPDIF_IRQ_OUTOFRANGE)
+		dev_err(host->dev, "spdif in: out of range error");
+
+	writel(0, host->io_base + SPDIF_IN_IRQ);
+
+	return IRQ_HANDLED;
+}
+
+static int spdif_in_probe(struct platform_device *pdev)
+{
+	struct spdif_in_dev *host;
+	struct spear_spdif_platform_data *pdata;
+	struct resource *res, *res_fifo;
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
+
+	res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res_fifo)
+		return -EINVAL;
+
+	if (!devm_request_mem_region(&pdev->dev, res->start,
+				resource_size(res), pdev->name)) {
+		dev_warn(&pdev->dev, "Failed to get memory resourse\n");
+		return -ENOENT;
+	}
+
+	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+	if (!host) {
+		dev_warn(&pdev->dev, "kzalloc fail\n");
+		return -ENOMEM;
+	}
+
+	host->io_base = devm_ioremap(&pdev->dev, res->start,
+				resource_size(res));
+	if (!host->io_base) {
+		dev_warn(&pdev->dev, "ioremap failed\n");
+		return -ENOMEM;
+	}
+
+	host->irq = platform_get_irq(pdev, 0);
+	if (host->irq < 0)
+		return -EINVAL;
+
+	host->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(host->clk))
+		return PTR_ERR(host->clk);
+
+	pdata = dev_get_platdata(&pdev->dev);
+
+	if (!pdata)
+		return -EINVAL;
+
+	host->dma_params.data = pdata->dma_params;
+	host->dma_params.addr = res_fifo->start;
+	host->dma_params.max_burst = 16;
+	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	host->reset_perip = pdata->reset_perip;
+
+	host->dev = &pdev->dev;
+	dev_set_drvdata(&pdev->dev, host);
+
+	ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0,
+			"spdif-in", host);
+	if (ret) {
+		dev_warn(&pdev->dev, "request_irq failed\n");
+		return ret;
+	}
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component,
+					      &spdif_in_dai, 1);
+	if (ret)
+		return ret;
+
+	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
+						pdata->filter);
+}
+
+static struct platform_driver spdif_in_driver = {
+	.probe		= spdif_in_probe,
+	.driver		= {
+		.name	= "spdif-in",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(spdif_in_driver);
+
+MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
+MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:spdif_in");

sound/soc/spear/spdif_in_regs.h

@@ -0,0 +1,60 @@
+/*
+ * SPEAr SPDIF IN controller header file
+ *
+ * Copyright (ST) 2011 Vipin Kumar (vipin.kumar@st.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef SPDIF_IN_REGS_H
+#define SPDIF_IN_REGS_H
+
+#define SPDIF_IN_CTRL		0x00
+	#define SPDIF_IN_PRTYEN		(1 << 20)
+	#define SPDIF_IN_STATEN		(1 << 19)
+	#define SPDIF_IN_USREN		(1 << 18)
+	#define SPDIF_IN_VALEN		(1 << 17)
+	#define SPDIF_IN_BLKEN		(1 << 16)
+
+	#define SPDIF_MODE_24BIT	(8 << 12)
+	#define SPDIF_MODE_23BIT	(7 << 12)
+	#define SPDIF_MODE_22BIT	(6 << 12)
+	#define SPDIF_MODE_21BIT	(5 << 12)
+	#define SPDIF_MODE_20BIT	(4 << 12)
+	#define SPDIF_MODE_19BIT	(3 << 12)
+	#define SPDIF_MODE_18BIT	(2 << 12)
+	#define SPDIF_MODE_17BIT	(1 << 12)
+	#define SPDIF_MODE_16BIT	(0 << 12)
+	#define SPDIF_MODE_MASK		(0x0F << 12)
+
+	#define SPDIF_IN_VALID		(1 << 11)
+	#define SPDIF_IN_SAMPLE		(1 << 10)
+	#define SPDIF_DATA_SWAP		(1 << 9)
+	#define SPDIF_IN_ENB		(1 << 8)
+	#define SPDIF_DATA_REVERT	(1 << 7)
+	#define SPDIF_XTRACT_16BIT	(1 << 6)
+	#define SPDIF_FIFO_THRES_16	(16 << 0)
+
+#define SPDIF_IN_IRQ_MASK	0x04
+#define SPDIF_IN_IRQ		0x08
+	#define SPDIF_IRQ_FIFOWRITE	(1 << 0)
+	#define SPDIF_IRQ_EMPTYFIFOREAD	(1 << 1)
+	#define SPDIF_IRQ_FIFOFULL	(1 << 2)
+	#define SPDIF_IRQ_OUTOFRANGE	(1 << 3)
+
+#define SPDIF_IN_STA		0x0C
+	#define SPDIF_IN_LOCK		(0x1 << 0)
+
+#endif /* SPDIF_IN_REGS_H */

sound/soc/spear/spdif_out.c

@@ -0,0 +1,367 @@
+/*
+ * ALSA SoC SPDIF Out Audio Layer for spear processors
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Vipin Kumar <vipin.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/soc.h>
+#include <sound/spear_dma.h>
+#include <sound/spear_spdif.h>
+#include "spdif_out_regs.h"
+#include "spear_pcm.h"
+
+struct spdif_out_params {
+	u32 rate;
+	u32 core_freq;
+	u32 mute;
+};
+
+struct spdif_out_dev {
+	struct clk *clk;
+	struct spear_dma_data dma_params;
+	struct spdif_out_params saved_params;
+	u32 running;
+	void __iomem *io_base;
+	struct snd_dmaengine_dai_dma_data dma_params_tx;
+	struct snd_dmaengine_pcm_config config;
+};
+
+static void spdif_out_configure(struct spdif_out_dev *host)
+{
+	writel(SPDIF_OUT_RESET, host->io_base + SPDIF_OUT_SOFT_RST);
+	mdelay(1);
+	writel(readl(host->io_base + SPDIF_OUT_SOFT_RST) & ~SPDIF_OUT_RESET,
+			host->io_base + SPDIF_OUT_SOFT_RST);
+
+	writel(SPDIF_OUT_FDMA_TRIG_16 | SPDIF_OUT_MEMFMT_16_16 |
+			SPDIF_OUT_VALID_HW | SPDIF_OUT_USER_HW |
+			SPDIF_OUT_CHNLSTA_HW | SPDIF_OUT_PARITY_HW,
+			host->io_base + SPDIF_OUT_CFG);
+
+	writel(0x7F, host->io_base + SPDIF_OUT_INT_STA_CLR);
+	writel(0x7F, host->io_base + SPDIF_OUT_INT_EN_CLR);
+}
+
+static int spdif_out_startup(struct snd_pcm_substream *substream,
+		struct snd_soc_dai *cpu_dai)
+{
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+	int ret;
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return -EINVAL;
+
+	ret = clk_enable(host->clk);
+	if (ret)
+		return ret;
+
+	host->running = true;
+	spdif_out_configure(host);
+
+	return 0;
+}
+
+static void spdif_out_shutdown(struct snd_pcm_substream *substream,
+		struct snd_soc_dai *dai)
+{
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return;
+
+	clk_disable(host->clk);
+	host->running = false;
+}
+
+static void spdif_out_clock(struct spdif_out_dev *host, u32 core_freq,
+		u32 rate)
+{
+	u32 divider, ctrl;
+
+	clk_set_rate(host->clk, core_freq);
+	divider = DIV_ROUND_CLOSEST(clk_get_rate(host->clk), (rate * 128));
+
+	ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
+	ctrl &= ~SPDIF_DIVIDER_MASK;
+	ctrl |= (divider << SPDIF_DIVIDER_SHIFT) & SPDIF_DIVIDER_MASK;
+	writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
+}
+
+static int spdif_out_hw_params(struct snd_pcm_substream *substream,
+		struct snd_pcm_hw_params *params,
+		struct snd_soc_dai *dai)
+{
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+	u32 rate, core_freq;
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return -EINVAL;
+
+	rate = params_rate(params);
+
+	switch (rate) {
+	case 8000:
+	case 16000:
+	case 32000:
+	case 64000:
+		/*
+		 * The clock is multiplied by 10 to bring it to feasible range
+		 * of frequencies for sscg
+		 */
+		core_freq = 64000 * 128 * 10;	/* 81.92 MHz */
+		break;
+	case 5512:
+	case 11025:
+	case 22050:
+	case 44100:
+	case 88200:
+	case 176400:
+		core_freq = 176400 * 128;	/* 22.5792 MHz */
+		break;
+	case 48000:
+	case 96000:
+	case 192000:
+	default:
+		core_freq = 192000 * 128;	/* 24.576 MHz */
+		break;
+	}
+
+	spdif_out_clock(host, core_freq, rate);
+	host->saved_params.core_freq = core_freq;
+	host->saved_params.rate = rate;
+
+	return 0;
+}
+
+static int spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
+		struct snd_soc_dai *dai)
+{
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+	u32 ctrl;
+	int ret = 0;
+
+	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
+		return -EINVAL;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+			ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
+			ctrl &= ~SPDIF_OPMODE_MASK;
+			if (!host->saved_params.mute)
+				ctrl |= SPDIF_OPMODE_AUD_DATA |
+					SPDIF_STATE_NORMAL;
+			else
+				ctrl |= SPDIF_OPMODE_MUTE_PCM;
+			writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
+		break;
+
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		ctrl = readl(host->io_base + SPDIF_OUT_CTRL);
+		ctrl &= ~SPDIF_OPMODE_MASK;
+		ctrl |= SPDIF_OPMODE_OFF;
+		writel(ctrl, host->io_base + SPDIF_OUT_CTRL);
+		break;
+
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static int spdif_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+	u32 val;
+
+	host->saved_params.mute = mute;
+	val = readl(host->io_base + SPDIF_OUT_CTRL);
+	val &= ~SPDIF_OPMODE_MASK;
+
+	if (mute)
+		val |= SPDIF_OPMODE_MUTE_PCM;
+	else {
+		if (host->running)
+			val |= SPDIF_OPMODE_AUD_DATA | SPDIF_STATE_NORMAL;
+		else
+			val |= SPDIF_OPMODE_OFF;
+	}
+
+	writel(val, host->io_base + SPDIF_OUT_CTRL);
+	return 0;
+}
+
+static int spdif_mute_get(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+
+	ucontrol->value.integer.value[0] = host->saved_params.mute;
+	return 0;
+}
+
+static int spdif_mute_put(struct snd_kcontrol *kcontrol,
+		struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
+
+	if (host->saved_params.mute == ucontrol->value.integer.value[0])
+		return 0;
+
+	spdif_digital_mute(cpu_dai, ucontrol->value.integer.value[0]);
+
+	return 1;
+}
+static const struct snd_kcontrol_new spdif_out_controls[] = {
+	SOC_SINGLE_BOOL_EXT("IEC958 Playback Switch", 0,
+			spdif_mute_get, spdif_mute_put),
+};
+
+static int spdif_soc_dai_probe(struct snd_soc_dai *dai)
+{
+	struct spdif_out_dev *host = snd_soc_dai_get_drvdata(dai);
+
+	host->dma_params_tx.filter_data = &host->dma_params;
+	dai->playback_dma_data = &host->dma_params_tx;
+
+	return snd_soc_add_dai_controls(dai, spdif_out_controls,
+				ARRAY_SIZE(spdif_out_controls));
+}
+
+static const struct snd_soc_dai_ops spdif_out_dai_ops = {
+	.digital_mute	= spdif_digital_mute,
+	.startup	= spdif_out_startup,
+	.shutdown	= spdif_out_shutdown,
+	.trigger	= spdif_out_trigger,
+	.hw_params	= spdif_out_hw_params,
+};
+
+static struct snd_soc_dai_driver spdif_out_dai = {
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+				 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \
+				 SNDRV_PCM_RATE_192000),
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	},
+	.probe = spdif_soc_dai_probe,
+	.ops = &spdif_out_dai_ops,
+};
+
+static const struct snd_soc_component_driver spdif_out_component = {
+	.name		= "spdif-out",
+};
+
+static int spdif_out_probe(struct platform_device *pdev)
+{
+	struct spdif_out_dev *host;
+	struct spear_spdif_platform_data *pdata;
+	struct resource *res;
+	int ret;
+
+	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+	if (!host) {
+		dev_warn(&pdev->dev, "kzalloc fail\n");
+		return -ENOMEM;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	host->io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(host->io_base))
+		return PTR_ERR(host->io_base);
+
+	host->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(host->clk))
+		return PTR_ERR(host->clk);
+
+	pdata = dev_get_platdata(&pdev->dev);
+
+	host->dma_params.data = pdata->dma_params;
+	host->dma_params.addr = res->start + SPDIF_OUT_FIFO_DATA;
+	host->dma_params.max_burst = 16;
+	host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+	dev_set_drvdata(&pdev->dev, host);
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &spdif_out_component,
+					      &spdif_out_dai, 1);
+	if (ret)
+		return ret;
+
+	return devm_spear_pcm_platform_register(&pdev->dev, &host->config,
+						pdata->filter);
+}
+
+#ifdef CONFIG_PM
+static int spdif_out_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
+
+	if (host->running)
+		clk_disable(host->clk);
+
+	return 0;
+}
+
+static int spdif_out_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct spdif_out_dev *host = dev_get_drvdata(&pdev->dev);
+
+	if (host->running) {
+		clk_enable(host->clk);
+		spdif_out_configure(host);
+		spdif_out_clock(host, host->saved_params.core_freq,
+				host->saved_params.rate);
+	}
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(spdif_out_dev_pm_ops, spdif_out_suspend, \
+		spdif_out_resume);
+
+#define SPDIF_OUT_DEV_PM_OPS (&spdif_out_dev_pm_ops)
+
+#else
+#define SPDIF_OUT_DEV_PM_OPS NULL
+
+#endif
+
+static struct platform_driver spdif_out_driver = {
+	.probe		= spdif_out_probe,
+	.driver		= {
+		.name	= "spdif-out",
+		.owner	= THIS_MODULE,
+		.pm	= SPDIF_OUT_DEV_PM_OPS,
+	},
+};
+
+module_platform_driver(spdif_out_driver);
+
+MODULE_AUTHOR("Vipin Kumar <vipin.kumar@st.com>");
+MODULE_DESCRIPTION("SPEAr SPDIF OUT SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:spdif_out");

sound/soc/spear/spdif_out_regs.h

@@ -0,0 +1,79 @@
+/*
+ * SPEAr SPDIF OUT controller header file
+ *
+ * Copyright (ST) 2011 Vipin Kumar (vipin.kumar@st.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef SPDIF_OUT_REGS_H
+#define SPDIF_OUT_REGS_H
+
+#define SPDIF_OUT_SOFT_RST	0x00
+	#define SPDIF_OUT_RESET		(1 << 0)
+#define SPDIF_OUT_FIFO_DATA	0x04
+#define SPDIF_OUT_INT_STA	0x08
+#define SPDIF_OUT_INT_STA_CLR	0x0C
+	#define SPDIF_INT_UNDERFLOW	(1 << 0)
+	#define SPDIF_INT_EODATA	(1 << 1)
+	#define SPDIF_INT_EOBLOCK	(1 << 2)
+	#define SPDIF_INT_EOLATENCY	(1 << 3)
+	#define SPDIF_INT_EOPD_DATA	(1 << 4)
+	#define SPDIF_INT_MEMFULLREAD	(1 << 5)
+	#define SPDIF_INT_EOPD_PAUSE	(1 << 6)
+
+#define SPDIF_OUT_INT_EN	0x10
+#define SPDIF_OUT_INT_EN_SET	0x14
+#define SPDIF_OUT_INT_EN_CLR	0x18
+#define SPDIF_OUT_CTRL		0x1C
+	#define SPDIF_OPMODE_MASK	(7 << 0)
+	#define SPDIF_OPMODE_OFF	(0 << 0)
+	#define SPDIF_OPMODE_MUTE_PCM	(1 << 0)
+	#define SPDIF_OPMODE_MUTE_PAUSE	(2 << 0)
+	#define SPDIF_OPMODE_AUD_DATA	(3 << 0)
+	#define SPDIF_OPMODE_ENCODE	(4 << 0)
+	#define SPDIF_STATE_NORMAL	(1 << 3)
+	#define SPDIF_DIVIDER_MASK	(0xff << 5)
+	#define SPDIF_DIVIDER_SHIFT	(5)
+	#define SPDIF_SAMPLEREAD_MASK	(0x1ffff << 15)
+	#define SPDIF_SAMPLEREAD_SHIFT	(15)
+#define SPDIF_OUT_STA		0x20
+#define SPDIF_OUT_PA_PB		0x24
+#define SPDIF_OUT_PC_PD		0x28
+#define SPDIF_OUT_CL1		0x2C
+#define SPDIF_OUT_CR1		0x30
+#define SPDIF_OUT_CL2_CR2_UV	0x34
+#define SPDIF_OUT_PAUSE_LAT	0x38
+#define SPDIF_OUT_FRMLEN_BRST	0x3C
+#define SPDIF_OUT_CFG		0x40
+	#define SPDIF_OUT_MEMFMT_16_0	(0 << 5)
+	#define SPDIF_OUT_MEMFMT_16_16	(1 << 5)
+	#define SPDIF_OUT_VALID_DMA	(0 << 3)
+	#define SPDIF_OUT_VALID_HW	(1 << 3)
+	#define SPDIF_OUT_USER_DMA	(0 << 2)
+	#define SPDIF_OUT_USER_HW	(1 << 2)
+	#define SPDIF_OUT_CHNLSTA_DMA	(0 << 1)
+	#define SPDIF_OUT_CHNLSTA_HW	(1 << 1)
+	#define SPDIF_OUT_PARITY_HW	(0 << 0)
+	#define SPDIF_OUT_PARITY_DMA	(1 << 0)
+	#define SPDIF_OUT_FDMA_TRIG_2	(2 << 8)
+	#define SPDIF_OUT_FDMA_TRIG_6	(6 << 8)
+	#define SPDIF_OUT_FDMA_TRIG_8	(8 << 8)
+	#define SPDIF_OUT_FDMA_TRIG_10	(10 << 8)
+	#define SPDIF_OUT_FDMA_TRIG_12	(12 << 8)
+	#define SPDIF_OUT_FDMA_TRIG_16	(16 << 8)
+	#define SPDIF_OUT_FDMA_TRIG_18	(18 << 8)
+
+#endif /* SPDIF_OUT_REGS_H */

sound/soc/spear/spear_pcm.c

@@ -0,0 +1,55 @@
+/*
+ * ALSA PCM interface for ST SPEAr Processors
+ *
+ * sound/soc/spear/spear_pcm.c
+ *
+ * Copyright (C) 2012 ST Microelectronics
+ * Rajeev Kumar<rajeevkumar.linux@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_device.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/spear_dma.h>
+#include "spear_pcm.h"
+
+static const struct snd_pcm_hardware spear_pcm_hardware = {
+	.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
+		 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+		 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
+	.buffer_bytes_max = 16 * 1024, /* max buffer size */
+	.period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
+	.period_bytes_max = 2 * 1024, /* maximum period size */
+	.periods_min = 1, /* min # periods */
+	.periods_max = 8, /* max # of periods */
+	.fifo_size = 0, /* fifo size in bytes */
+};
+
+static const struct snd_dmaengine_pcm_config spear_dmaengine_pcm_config = {
+	.pcm_hardware = &spear_pcm_hardware,
+	.prealloc_buffer_size = 16 * 1024,
+};
+
+int devm_spear_pcm_platform_register(struct device *dev,
+			struct snd_dmaengine_pcm_config *config,
+			bool (*filter)(struct dma_chan *chan, void *slave))
+{
+	*config = spear_dmaengine_pcm_config;
+	config->compat_filter_fn = filter;
+
+	return snd_dmaengine_pcm_register(dev, config,
+		SND_DMAENGINE_PCM_FLAG_NO_DT |
+		SND_DMAENGINE_PCM_FLAG_COMPAT);
+}
+EXPORT_SYMBOL_GPL(devm_spear_pcm_platform_register);
+
+MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
+MODULE_DESCRIPTION("SPEAr PCM DMA module");
+MODULE_LICENSE("GPL");

sound/soc/spear/spear_pcm.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __SPEAR_PCM_H__
+#define __SPEAR_PCM_H__
+
+int devm_spear_pcm_platform_register(struct device *dev,
+			struct snd_dmaengine_pcm_config *config,
+			bool (*filter)(struct dma_chan *chan, void *slave));
+
+#endif