[PATCH] Davinci ASoC support

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Add ASoC support for the TI Davinci SoC and the Davicni-EVM reference board.
It includes:
- ASoC Davinci DMA driver
- ASoC Davinci I2S (Davinci McBSP module based) driver
- ASoC Davinci-EVM reference board

Signed-off-by: Vladimir Barinov <vbarinov@xxxxxxxxxxxxx>

Index: linux-2.6.25-rc1/sound/soc/davinci/Makefile
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/Makefile
@@ -0,0 +1,11 @@
+# DAVINCI Platform Support
+snd-soc-davinci-objs := davinci-pcm.o
+snd-soc-davinci-i2s-objs := davinci-i2s.o
+
+obj-$(CONFIG_SND_DAVINCI_SOC) += snd-soc-davinci.o
+obj-$(CONFIG_SND_DAVINCI_SOC_I2S) += snd-soc-davinci-i2s.o
+
+# DAVINCI Machine Support
+snd-soc-evm-objs := davinci-evm.o
+
+obj-$(CONFIG_SND_DAVINCI_SOC_EVM) += snd-soc-evm.o
Index: linux-2.6.25-rc1/sound/soc/davinci/davinci-evm.c
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/davinci-evm.c
@@ -0,0 +1,208 @@
+/*
+ * ASoC driver for TI DAVINCI EVM platform
+ *
+ * Author:      Vladimir Barinov, <vbarinov@xxxxxxxxxxxxx>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#include <asm/mach-types.h>
+#include <asm/dma.h>
+#include <asm/arch/hardware.h>
+
+#include "../codecs/tlv320aic3x.h"
+#include "davinci-pcm.h"
+#include "davinci-i2s.h"
+
+#define EVM_CODEC_CLOCK 22579200
+
+static int evm_hw_params(struct snd_pcm_substream *substream,
+			 struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_codec_dai *codec_dai = rtd->dai->codec_dai;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	int ret = 0;
+
+	/* set codec DAI configuration */
+	ret = codec_dai->dai_ops.set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
+					 SND_SOC_DAIFMT_CBM_CFM);
+	if (ret < 0)
+		return ret;
+
+	/* set cpu DAI configuration */
+	ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_CBM_CFM |
+				       SND_SOC_DAIFMT_IB_NF);
+	if (ret < 0)
+		return ret;
+
+	/* set the codec system clock */
+	ret = codec_dai->dai_ops.set_sysclk(codec_dai, 0, EVM_CODEC_CLOCK,
+					    SND_SOC_CLOCK_OUT);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static struct snd_soc_ops evm_ops = {
+	.hw_params = evm_hw_params,
+};
+
+/* davinci-evm machine dapm widgets */
+static const struct snd_soc_dapm_widget aic3x_dapm_widgets[] = {
+	SND_SOC_DAPM_HP("Headphone Jack", NULL),
+	SND_SOC_DAPM_LINE("Line Out", NULL),
+	SND_SOC_DAPM_MIC("Mic Jack", NULL),
+	SND_SOC_DAPM_LINE("Line In", NULL),
+};
+
+/* davinci-evm machine audio_mapnections to the codec pins */
+static const char *audio_map[][3] = {
+	/* Headphone connected to HPLOUT, HPROUT */
+	{"Headphone Jack", NULL, "HPLOUT"},
+	{"Headphone Jack", NULL, "HPROUT"},
+
+	/* Line Out connected to LLOUT, RLOUT */
+	{"Line Out", NULL, "LLOUT"},
+	{"Line Out", NULL, "RLOUT"},
+
+	/* Mic connected to (MIC3L | MIC3R) */
+	{"MIC3L", NULL, "Mic Bias 2V"},
+	{"MIC3R", NULL, "Mic Bias 2V"},
+	{"Mic Bias 2V", NULL, "Mic Jack"},
+
+	/* Line In connected to (LINE1L | LINE2L), (LINE1R | LINE2R) */
+	{"LINE1L", NULL, "Line In"},
+	{"LINE2L", NULL, "Line In"},
+	{"LINE1R", NULL, "Line In"},
+	{"LINE2R", NULL, "Line In"},
+
+	{NULL, NULL, NULL},
+};
+
+/* Logic for a aic3x as connected on a davinci-evm */
+static int evm_aic3x_init(struct snd_soc_codec *codec)
+{
+	int i;
+
+	/* Add davinci-evm specific widgets */
+	for (i = 0; i < ARRAY_SIZE(aic3x_dapm_widgets); i++)
+		snd_soc_dapm_new_control(codec, &aic3x_dapm_widgets[i]);
+
+	/* Set up davinci-evm specific audio path audio_map */
+	for (i = 0; audio_map[i][0] != NULL; i++)
+		snd_soc_dapm_connect_input(codec, audio_map[i][0],
+					   audio_map[i][1], audio_map[i][2]);
+
+	/* not connected */
+	snd_soc_dapm_set_endpoint(codec, "MONO_LOUT", 0);
+	snd_soc_dapm_set_endpoint(codec, "HPLCOM", 0);
+	snd_soc_dapm_set_endpoint(codec, "HPRCOM", 0);
+
+	/* always connected */
+	snd_soc_dapm_set_endpoint(codec, "Headphone Jack", 1);
+	snd_soc_dapm_set_endpoint(codec, "Line Out", 1);
+	snd_soc_dapm_set_endpoint(codec, "Mic Jack", 1);
+	snd_soc_dapm_set_endpoint(codec, "Line In", 1);
+
+	snd_soc_dapm_sync_endpoints(codec);
+
+	return 0;
+}
+
+/* davinci-evm digital audio interface glue - connects codec <--> CPU */
+static struct snd_soc_dai_link evm_dai = {
+	.name = "TLV320AIC3X",
+	.stream_name = "AIC3X",
+	.cpu_dai = &davinci_i2s_dai,
+	.codec_dai = &aic3x_dai,
+	.init = evm_aic3x_init,
+	.ops = &evm_ops,
+};
+
+/* davinci-evm audio machine driver */
+static struct snd_soc_machine snd_soc_machine_evm = {
+	.name = "DaVinci EVM",
+	.dai_link = &evm_dai,
+	.num_links = 1,
+};
+
+/* evm audio private data */
+static struct aic3x_setup_data evm_aic3x_setup = {
+	.i2c_address = 0x1b,
+};
+
+/* evm audio subsystem */
+static struct snd_soc_device evm_snd_devdata = {
+	.machine = &snd_soc_machine_evm,
+	.platform = &davinci_soc_platform,
+	.codec_dev = &soc_codec_dev_aic3x,
+	.codec_data = &evm_aic3x_setup,
+};
+
+static struct resource evm_snd_resources[] = {
+	{
+		.start = DAVINCI_MCBSP_BASE,
+		.end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+static struct evm_snd_platform_data evm_snd_data = {
+	.tx_dma_ch	= DM644X_DMACH_MCBSP_TX,
+	.rx_dma_ch	= DM644X_DMACH_MCBSP_RX,
+};
+
+static struct platform_device *evm_snd_device;
+
+static int __init evm_init(void)
+{
+	int ret;
+
+	evm_snd_device = platform_device_alloc("soc-audio", 0);
+	if (!evm_snd_device)
+		return -ENOMEM;
+
+	platform_set_drvdata(evm_snd_device, &evm_snd_devdata);
+	evm_snd_devdata.dev = &evm_snd_device->dev;
+	evm_snd_device->dev.platform_data = &evm_snd_data;
+
+	ret = platform_device_add_resources(evm_snd_device, evm_snd_resources,
+					    ARRAY_SIZE(evm_snd_resources));
+	if (ret) {
+		platform_device_put(evm_snd_device);
+		return ret;
+	}
+
+	ret = platform_device_add(evm_snd_device);
+	if (ret)
+		platform_device_put(evm_snd_device);
+
+	return ret;
+}
+
+static void __exit evm_exit(void)
+{
+	platform_device_unregister(evm_snd_device);
+}
+
+module_init(evm_init);
+module_exit(evm_exit);
+
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_DESCRIPTION("TI DAVINCI EVM ASoC driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.25-rc1/sound/soc/davinci/davinci-i2s.c
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/davinci-i2s.c
@@ -0,0 +1,407 @@
+/*
+ * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
+ *
+ * Author:      Vladimir Barinov, <vbarinov@xxxxxxxxxxxxx>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "davinci-pcm.h"
+
+#define DAVINCI_MCBSP_DRR_REG	0x00
+#define DAVINCI_MCBSP_DXR_REG	0x04
+#define DAVINCI_MCBSP_SPCR_REG	0x08
+#define DAVINCI_MCBSP_RCR_REG	0x0c
+#define DAVINCI_MCBSP_XCR_REG	0x10
+#define DAVINCI_MCBSP_SRGR_REG	0x14
+#define DAVINCI_MCBSP_PCR_REG	0x24
+
+#define DAVINCI_MCBSP_SPCR_RRST		(1 << 0)
+#define DAVINCI_MCBSP_SPCR_RINTM(v)	((v) << 4)
+#define DAVINCI_MCBSP_SPCR_XRST		(1 << 16)
+#define DAVINCI_MCBSP_SPCR_XINTM(v)	((v) << 20)
+#define DAVINCI_MCBSP_SPCR_GRST		(1 << 22)
+#define DAVINCI_MCBSP_SPCR_FRST		(1 << 23)
+#define DAVINCI_MCBSP_SPCR_FREE		(1 << 25)
+
+#define DAVINCI_MCBSP_RCR_RWDLEN1(v)	((v) << 5)
+#define DAVINCI_MCBSP_RCR_RFRLEN1(v)	((v) << 8)
+#define DAVINCI_MCBSP_RCR_RDATDLY(v)	((v) << 16)
+#define DAVINCI_MCBSP_RCR_RWDLEN2(v)	((v) << 21)
+
+#define DAVINCI_MCBSP_XCR_XWDLEN1(v)	((v) << 5)
+#define DAVINCI_MCBSP_XCR_XFRLEN1(v)	((v) << 8)
+#define DAVINCI_MCBSP_XCR_XDATDLY(v)	((v) << 16)
+#define DAVINCI_MCBSP_XCR_XFIG		(1 << 18)
+#define DAVINCI_MCBSP_XCR_XWDLEN2(v)	((v) << 21)
+
+#define DAVINCI_MCBSP_SRGR_FWID(v)	((v) << 8)
+#define DAVINCI_MCBSP_SRGR_FPER(v)	((v) << 16)
+#define DAVINCI_MCBSP_SRGR_FSGM		(1 << 28)
+
+#define DAVINCI_MCBSP_PCR_CLKRP		(1 << 0)
+#define DAVINCI_MCBSP_PCR_CLKXP		(1 << 1)
+#define DAVINCI_MCBSP_PCR_FSRP		(1 << 2)
+#define DAVINCI_MCBSP_PCR_FSXP		(1 << 3)
+#define DAVINCI_MCBSP_PCR_CLKRM		(1 << 8)
+#define DAVINCI_MCBSP_PCR_CLKXM		(1 << 9)
+#define DAVINCI_MCBSP_PCR_FSRM		(1 << 10)
+#define DAVINCI_MCBSP_PCR_FSXM		(1 << 11)
+
+#define MOD_REG_BIT(val, mask, set) do { \
+	if (set) { \
+		val |= mask; \
+	} else { \
+		val &= ~mask; \
+	} \
+} while (0)
+
+enum {
+	DAVINCI_MCBSP_WORD_8 = 0,
+	DAVINCI_MCBSP_WORD_12,
+	DAVINCI_MCBSP_WORD_16,
+	DAVINCI_MCBSP_WORD_20,
+	DAVINCI_MCBSP_WORD_24,
+	DAVINCI_MCBSP_WORD_32,
+};
+
+static struct davinci_pcm_dma_params davinci_i2s_pcm_out = {
+	.name = "I2S PCM Stereo out",
+};
+
+static struct davinci_pcm_dma_params davinci_i2s_pcm_in = {
+	.name = "I2S PCM Stereo in",
+};
+
+struct davinci_mcbsp_dev {
+	void __iomem			*base;
+	struct clk			*clk;
+	struct davinci_pcm_dma_params	*dma_params[2];
+};
+
+static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
+					   int reg, u32 val)
+{
+	__raw_writel(val, dev->base + reg);
+}
+
+static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
+{
+	return __raw_readl(dev->base + reg);
+}
+
+static void davinci_mcbsp_start(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+	u32 w;
+
+	/* Start the sample generator and enable transmitter/receiver */
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST, 1);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 1);
+	else
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
+
+	/* Start frame sync */
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_FRST, 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
+}
+
+static void davinci_mcbsp_stop(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+	u32 w;
+
+	/* Reset transmitter/receiver and sample rate/frame sync generators */
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST |
+		       DAVINCI_MCBSP_SPCR_FRST, 0);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 0);
+	else
+		MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 0);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
+}
+
+static int davinci_i2s_startup(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+
+	cpu_dai->dma_data = dev->dma_params[substream->stream];
+
+	return 0;
+}
+
+static int davinci_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
+				   unsigned int fmt)
+{
+	struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
+	u32 w;
+
+	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+	case SND_SOC_DAIFMT_CBS_CFS:
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG,
+					DAVINCI_MCBSP_PCR_FSXM |
+					DAVINCI_MCBSP_PCR_FSRM |
+					DAVINCI_MCBSP_PCR_CLKXM |
+					DAVINCI_MCBSP_PCR_CLKRM);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG,
+					DAVINCI_MCBSP_SRGR_FSGM);
+		break;
+	case SND_SOC_DAIFMT_CBM_CFM:
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_IB_NF:
+		w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
+		MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
+			       DAVINCI_MCBSP_PCR_CLKRP, 1);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
+		break;
+	case SND_SOC_DAIFMT_NB_IF:
+		w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
+		MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_FSXP |
+			       DAVINCI_MCBSP_PCR_FSRP, 1);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
+		break;
+	case SND_SOC_DAIFMT_IB_IF:
+		w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
+		MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
+			       DAVINCI_MCBSP_PCR_CLKRP |
+			       DAVINCI_MCBSP_PCR_FSXP |
+			       DAVINCI_MCBSP_PCR_FSRP, 1);
+		davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
+		break;
+	case SND_SOC_DAIFMT_NB_NF:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
+	struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
+	struct snd_interval *i = NULL;
+	int mcbsp_word_length;
+	u32 w;
+
+	/* general line settings */
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
+				DAVINCI_MCBSP_SPCR_RINTM(3) |
+				DAVINCI_MCBSP_SPCR_XINTM(3) |
+				DAVINCI_MCBSP_SPCR_FREE);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG,
+				DAVINCI_MCBSP_RCR_RFRLEN1(1) |
+				DAVINCI_MCBSP_RCR_RDATDLY(1));
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG,
+				DAVINCI_MCBSP_XCR_XFRLEN1(1) |
+				DAVINCI_MCBSP_XCR_XDATDLY(1) |
+				DAVINCI_MCBSP_XCR_XFIG);
+
+	i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
+
+	i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
+
+	/* Determine xfer data type */
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S8:
+		dma_params->data_type = 1;
+		mcbsp_word_length = DAVINCI_MCBSP_WORD_8;
+		break;
+	case SNDRV_PCM_FORMAT_S16_LE:
+		dma_params->data_type = 2;
+		mcbsp_word_length = DAVINCI_MCBSP_WORD_16;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		dma_params->data_type = 4;
+		mcbsp_word_length = DAVINCI_MCBSP_WORD_32;
+		break;
+	default:
+		printk(KERN_WARNING "davinci-i2s: unsupported PCM format");
+		return -EINVAL;
+	}
+
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_RCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
+		       DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, w);
+
+	w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_XCR_REG);
+	MOD_REG_BIT(w, DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
+		       DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length), 1);
+	davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, w);
+
+	return 0;
+}
+
+static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		davinci_mcbsp_start(substream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		davinci_mcbsp_stop(substream);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int davinci_i2s_probe(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_machine *machine = socdev->machine;
+	struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
+	struct davinci_mcbsp_dev *dev;
+	struct resource *mem, *ioarea;
+	struct evm_snd_platform_data *pdata;
+	int ret;
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!mem) {
+		dev_err(&pdev->dev, "no mem resource?\n");
+		return -ENODEV;
+	}
+
+	ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
+				    pdev->name);
+	if (!ioarea) {
+		dev_err(&pdev->dev, "McBSP region already claimed\n");
+		return -EBUSY;
+	}
+
+	dev = kzalloc(sizeof(struct davinci_mcbsp_dev), GFP_KERNEL);
+	if (!dev) {
+		ret = -ENOMEM;
+		goto err_release_region;
+	}
+
+	cpu_dai->private_data = dev;
+
+	dev->clk = clk_get(&pdev->dev, "McBSPCLK");
+	if (IS_ERR(dev->clk)) {
+		ret = -ENODEV;
+		goto err_free_mem;
+	}
+	clk_enable(dev->clk);
+
+	dev->base = (void __iomem *)IO_ADDRESS(mem->start);
+	pdata = pdev->dev.platform_data;
+
+	dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK] = &davinci_i2s_pcm_out;
+	dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->channel = pdata->tx_dma_ch;
+	dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->dma_addr =
+	    (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DXR_REG);
+
+	dev->dma_params[SNDRV_PCM_STREAM_CAPTURE] = &davinci_i2s_pcm_in;
+	dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->channel = pdata->rx_dma_ch;
+	dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->dma_addr =
+	    (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DRR_REG);
+
+	return 0;
+
+err_free_mem:
+	kfree(dev);
+err_release_region:
+	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+
+	return ret;
+}
+
+static void davinci_i2s_remove(struct platform_device *pdev)
+{
+	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+	struct snd_soc_machine *machine = socdev->machine;
+	struct snd_soc_cpu_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
+	struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
+	struct resource *mem;
+
+	clk_disable(dev->clk);
+	clk_put(dev->clk);
+	dev->clk = NULL;
+
+	kfree(dev);
+
+	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	release_mem_region(mem->start, (mem->end - mem->start) + 1);
+}
+
+#define DAVINCI_I2S_RATES	SNDRV_PCM_RATE_8000_96000
+
+struct snd_soc_cpu_dai davinci_i2s_dai = {
+	.name = "davinci-i2s",
+	.id = 0,
+	.type = SND_SOC_DAI_I2S,
+	.probe = davinci_i2s_probe,
+	.remove = davinci_i2s_remove,
+	.playback = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = DAVINCI_I2S_RATES,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
+	.capture = {
+		.channels_min = 2,
+		.channels_max = 2,
+		.rates = DAVINCI_I2S_RATES,
+		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
+	.ops = {
+		.startup = davinci_i2s_startup,
+		.trigger = davinci_i2s_trigger,
+		.hw_params = davinci_i2s_hw_params,},
+	.dai_ops = {
+		.set_fmt = davinci_i2s_set_dai_fmt,
+	},
+};
+EXPORT_SYMBOL_GPL(davinci_i2s_dai);
+
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
+MODULE_LICENSE("GPL");
Index: linux-2.6.25-rc1/sound/soc/davinci/davinci-i2s.h
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/davinci-i2s.h
@@ -0,0 +1,17 @@
+/*
+ * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
+ *
+ * Author:      Vladimir Barinov, <vbarinov@xxxxxxxxxxxxx>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DAVINCI_I2S_H
+#define _DAVINCI_I2S_H
+
+extern struct snd_soc_cpu_dai davinci_i2s_dai;
+
+#endif
Index: linux-2.6.25-rc1/sound/soc/davinci/davinci-pcm.c
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/davinci-pcm.c
@@ -0,0 +1,389 @@
+/*
+ * ALSA PCM interface for the TI DAVINCI processor
+ *
+ * Author:      Vladimir Barinov, <vbarinov@xxxxxxxxxxxxx>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/dma.h>
+
+#include "davinci-pcm.h"
+
+#define DAVINCI_PCM_DEBUG 0
+#if DAVINCI_PCM_DEBUG
+#define DPRINTK(x...) printk(KERN_DEBUG x)
+#else
+#define DPRINTK(x...)
+#endif
+
+static struct snd_pcm_hardware davinci_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),
+	.formats = (SNDRV_PCM_FMTBIT_S16_LE),
+	.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
+		  SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
+		  SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
+		  SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
+		  SNDRV_PCM_RATE_KNOT),
+	.rate_min = 8000,
+	.rate_max = 96000,
+	.channels_min = 2,
+	.channels_max = 2,
+	.buffer_bytes_max = 128 * 1024,
+	.period_bytes_min = 32,
+	.period_bytes_max = 8 * 1024,
+	.periods_min = 16,
+	.periods_max = 255,
+	.fifo_size = 0,
+};
+
+struct davinci_runtime_data {
+	spinlock_t lock;
+	int period;		/* current DMA period */
+	int master_lch;		/* Master DMA channel */
+	int slave_lch;		/* Slave DMA channel */
+	struct davinci_pcm_dma_params *params;	/* DMA params */
+};
+
+static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int lch = prtd->slave_lch;
+	unsigned int period_size;
+	unsigned int dma_offset;
+	dma_addr_t dma_pos;
+	dma_addr_t src, dst;
+	unsigned short src_bidx, dst_bidx;
+	unsigned int data_type;
+	unsigned int count;
+
+	period_size = snd_pcm_lib_period_bytes(substream);
+	dma_offset = prtd->period * period_size;
+	dma_pos = runtime->dma_addr + dma_offset;
+
+	DPRINTK("audio_set_dma_params_play channel = %d dma_ptr = %x "
+		"period_size=%x\n", lch, dma_pos, period_size);
+
+	data_type = prtd->params->data_type;
+	count = period_size / data_type;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		src = dma_pos;
+		dst = prtd->params->dma_addr;
+		src_bidx = data_type;
+		dst_bidx = 0;
+	} else {
+		src = prtd->params->dma_addr;
+		dst = dma_pos;
+		src_bidx = 0;
+		dst_bidx = data_type;
+	}
+
+	davinci_set_dma_src_params(lch, src, INCR, W8BIT);
+	davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
+	davinci_set_dma_src_index(lch, src_bidx, 0);
+	davinci_set_dma_dest_index(lch, dst_bidx, 0);
+	davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);
+
+	prtd->period++;
+	if (unlikely(prtd->period >= runtime->periods))
+		prtd->period = 0;
+}
+
+static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
+{
+	struct snd_pcm_substream *substream = data;
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+
+	DPRINTK("lch=%d, status=0x%x\n", lch, ch_status);
+
+	if (unlikely(ch_status != DMA_COMPLETE))
+		return;
+
+	if (snd_pcm_running(substream)) {
+		snd_pcm_period_elapsed(substream);
+
+		spin_lock(&prtd->lock);
+		davinci_pcm_enqueue_dma(substream);
+		spin_unlock(&prtd->lock);
+	}
+}
+
+static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
+	int tcc = TCC_ANY;
+	int ret;
+
+	if (!dma_data)
+		return -ENODEV;
+
+	prtd->params = dma_data;
+
+	/* Request master DMA channel */
+	ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
+				  davinci_pcm_dma_irq, substream,
+				  &prtd->master_lch, &tcc, EVENTQ_0);
+	if (ret)
+		return ret;
+
+	/* Request slave DMA channel */
+	ret = davinci_request_dma(PARAM_ANY, "Link",
+				  NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
+	if (ret) {
+		davinci_free_dma(prtd->master_lch);
+		return ret;
+	}
+
+	/* Link slave DMA channel in loopback */
+	davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);
+
+	return 0;
+}
+
+static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	int ret = 0;
+
+	spin_lock(&prtd->lock);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		davinci_start_dma(prtd->master_lch);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		davinci_stop_dma(prtd->master_lch);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	spin_unlock(&prtd->lock);
+
+	return ret;
+}
+
+static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct davinci_runtime_data *prtd = substream->runtime->private_data;
+	struct paramentry_descriptor temp;
+
+	prtd->period = 0;
+	davinci_pcm_enqueue_dma(substream);
+
+	/* Get slave channel dma params for master channel startup */
+	davinci_get_dma_params(prtd->slave_lch, &temp);
+	davinci_set_dma_params(prtd->master_lch, &temp);
+
+	return 0;
+}
+
+static snd_pcm_uframes_t
+davinci_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct davinci_runtime_data *prtd = runtime->private_data;
+	unsigned int offset;
+	dma_addr_t count;
+	dma_addr_t src, dst;
+
+	spin_lock(&prtd->lock);
+
+	davinci_dma_getposition(prtd->master_lch, &src, &dst);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		count = src - runtime->dma_addr;
+	else
+		count = dst - runtime->dma_addr;;
+
+	spin_unlock(&prtd->lock);
+
+	offset = bytes_to_frames(runtime, count);
+	if (offset >= runtime->buffer_size)
+		offset = 0;
+
+	return offset;
+}
+
+static int davinci_pcm_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct davinci_runtime_data *prtd;
+	int ret = 0;
+
+	snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
+
+	prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
+	if (prtd == NULL)
+		return -ENOMEM;
+
+	spin_lock_init(&prtd->lock);
+
+	runtime->private_data = prtd;
+
+	ret = davinci_pcm_dma_request(substream);
+	if (ret) {
+		printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
+		kfree(prtd);
+	}
+
+	return ret;
+}
+
+static int davinci_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct davinci_runtime_data *prtd = runtime->private_data;
+
+	davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);
+
+	davinci_free_dma(prtd->slave_lch);
+	davinci_free_dma(prtd->master_lch);
+
+	kfree(prtd);
+
+	return 0;
+}
+
+static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *hw_params)
+{
+	return snd_pcm_lib_malloc_pages(substream,
+					params_buffer_bytes(hw_params));
+}
+
+static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int davinci_pcm_mmap(struct snd_pcm_substream *substream,
+			    struct vm_area_struct *vma)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+				     runtime->dma_area,
+				     runtime->dma_addr,
+				     runtime->dma_bytes);
+}
+
+struct snd_pcm_ops davinci_pcm_ops = {
+	.open = 	davinci_pcm_open,
+	.close = 	davinci_pcm_close,
+	.ioctl = 	snd_pcm_lib_ioctl,
+	.hw_params = 	davinci_pcm_hw_params,
+	.hw_free = 	davinci_pcm_hw_free,
+	.prepare = 	davinci_pcm_prepare,
+	.trigger = 	davinci_pcm_trigger,
+	.pointer = 	davinci_pcm_pointer,
+	.mmap = 	davinci_pcm_mmap,
+};
+
+static int davinci_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
+{
+	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
+	struct snd_dma_buffer *buf = &substream->dma_buffer;
+	size_t size = davinci_pcm_hardware.buffer_bytes_max;
+
+	buf->dev.type = SNDRV_DMA_TYPE_DEV;
+	buf->dev.dev = pcm->card->dev;
+	buf->private_data = NULL;
+	buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+					   &buf->addr, GFP_KERNEL);
+
+	DPRINTK("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
+		(void *) buf->area, (void *) buf->addr, size);
+
+	if (!buf->area)
+		return -ENOMEM;
+
+	buf->bytes = size;
+	return 0;
+}
+
+static void davinci_pcm_free(struct snd_pcm *pcm)
+{
+	struct snd_pcm_substream *substream;
+	struct snd_dma_buffer *buf;
+	int stream;
+
+	for (stream = 0; stream < 2; stream++) {
+		substream = pcm->streams[stream].substream;
+		if (!substream)
+			continue;
+
+		buf = &substream->dma_buffer;
+		if (!buf->area)
+			continue;
+
+		dma_free_writecombine(pcm->card->dev, buf->bytes,
+				      buf->area, buf->addr);
+		buf->area = NULL;
+	}
+}
+
+static u64 davinci_pcm_dmamask = 0xffffffff;
+
+static int davinci_pcm_new(struct snd_card *card,
+			   struct snd_soc_codec_dai *dai, struct snd_pcm *pcm)
+{
+	int ret;
+
+	if (!card->dev->dma_mask)
+		card->dev->dma_mask = &davinci_pcm_dmamask;
+	if (!card->dev->coherent_dma_mask)
+		card->dev->coherent_dma_mask = 0xffffffff;
+
+	if (dai->playback.channels_min) {
+		ret = davinci_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_PLAYBACK);
+		if (ret)
+			return ret;
+	}
+
+	if (dai->capture.channels_min) {
+		ret = davinci_pcm_preallocate_dma_buffer(pcm,
+			SNDRV_PCM_STREAM_CAPTURE);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+struct snd_soc_platform davinci_soc_platform = {
+	.name = 	"davinci-audio",
+	.pcm_ops = 	&davinci_pcm_ops,
+	.pcm_new = 	davinci_pcm_new,
+	.pcm_free = 	davinci_pcm_free,
+};
+EXPORT_SYMBOL_GPL(davinci_soc_platform);
+
+MODULE_AUTHOR("Vladimir Barinov");
+MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
+MODULE_LICENSE("GPL");
Index: linux-2.6.25-rc1/sound/soc/davinci/davinci-pcm.h
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/davinci-pcm.h
@@ -0,0 +1,29 @@
+/*
+ * ALSA PCM interface for the TI DAVINCI processor
+ *
+ * Author:      Vladimir Barinov, <vbarinov@xxxxxxxxxxxxx>
+ * Copyright:   (C) 2007 MontaVista Software, Inc., <source@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DAVINCI_PCM_H
+#define _DAVINCI_PCM_H
+
+struct davinci_pcm_dma_params {
+	char *name;		/* stream identifier */
+	int channel;		/* sync dma channel ID */
+	dma_addr_t dma_addr;	/* device physical address for DMA */
+	unsigned int data_type;	/* xfer data type */
+};
+
+struct evm_snd_platform_data {
+	int tx_dma_ch;
+	int rx_dma_ch;
+};
+
+extern struct snd_soc_platform davinci_soc_platform;
+
+#endif
Index: linux-2.6.25-rc1/sound/soc/Kconfig
===================================================================
--- linux-2.6.25-rc1.orig/sound/soc/Kconfig
+++ linux-2.6.25-rc1/sound/soc/Kconfig
@@ -29,6 +29,7 @@ source "sound/soc/pxa/Kconfig"
 source "sound/soc/s3c24xx/Kconfig"
 source "sound/soc/sh/Kconfig"
 source "sound/soc/fsl/Kconfig"
+source "sound/soc/davinci/Kconfig"
 
 # Supported codecs
 source "sound/soc/codecs/Kconfig"
Index: linux-2.6.25-rc1/sound/soc/Makefile
===================================================================
--- linux-2.6.25-rc1.orig/sound/soc/Makefile
+++ linux-2.6.25-rc1/sound/soc/Makefile
@@ -1,4 +1,4 @@
 snd-soc-core-objs := soc-core.o soc-dapm.o
 
 obj-$(CONFIG_SND_SOC)	+= snd-soc-core.o
-obj-$(CONFIG_SND_SOC)	+= codecs/ at91/ pxa/ s3c24xx/ sh/ fsl/
+obj-$(CONFIG_SND_SOC)	+= codecs/ at91/ pxa/ s3c24xx/ sh/ fsl/ davinci/
Index: linux-2.6.25-rc1/sound/soc/davinci/Kconfig
===================================================================
--- /dev/null
+++ linux-2.6.25-rc1/sound/soc/davinci/Kconfig
@@ -0,0 +1,19 @@
+config SND_DAVINCI_SOC
+	tristate "SoC Audio for the TI DAVINCI chip"
+	depends on ARCH_DAVINCI && SND_SOC
+	help
+	  Say Y or M if you want to add support for codecs attached to
+	  the DAVINCI AC97 or I2S interface. You will also need
+	  to select the audio interfaces to support below.
+
+config SND_DAVINCI_SOC_I2S
+	tristate
+
+config SND_DAVINCI_SOC_EVM
+	tristate "SoC Audio support for DaVinci EVM"
+	depends on SND_DAVINCI_SOC && MACH_DAVINCI_EVM
+	select SND_DAVINCI_SOC_I2S
+	select SND_SOC_TLV320AIC3X
+	help
+	  Say Y if you want to add support for SoC audio on TI
+	  DaVinci EVM platform.
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