sound/soc/dwc/designware_i2s.c - kernel/msm-4.19 - Gitiles

 /*
  * ALSA SoC Synopsys I2S Audio Layer
  *
  * sound/soc/dwc/designware_i2s.c
  *
  * Copyright (C) 2010 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/clk.h>
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <sound/designware_i2s.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>

 /* common register for all channel */
 #define IER		0x000
 #define IRER		0x004
 #define ITER		0x008
 #define CER		0x00C
 #define CCR		0x010
 #define RXFFR		0x014
 #define TXFFR		0x018

 /* I2STxRxRegisters for all channels */
 #define LRBR_LTHR(x)	(0x40 * x + 0x020)
 #define RRBR_RTHR(x)	(0x40 * x + 0x024)
 #define RER(x)		(0x40 * x + 0x028)
 #define TER(x)		(0x40 * x + 0x02C)
 #define RCR(x)		(0x40 * x + 0x030)
 #define TCR(x)		(0x40 * x + 0x034)
 #define ISR(x)		(0x40 * x + 0x038)
 #define IMR(x)		(0x40 * x + 0x03C)
 #define ROR(x)		(0x40 * x + 0x040)
 #define TOR(x)		(0x40 * x + 0x044)
 #define RFCR(x)		(0x40 * x + 0x048)
 #define TFCR(x)		(0x40 * x + 0x04C)
 #define RFF(x)		(0x40 * x + 0x050)
 #define TFF(x)		(0x40 * x + 0x054)

 /* I2SCOMPRegisters */
 #define I2S_COMP_PARAM_2	0x01F0
 #define I2S_COMP_PARAM_1	0x01F4
 #define I2S_COMP_VERSION	0x01F8
 #define I2S_COMP_TYPE		0x01FC

 #define MAX_CHANNEL_NUM		8
 #define MIN_CHANNEL_NUM		2

 struct dw_i2s_dev {
 	void __iomem *i2s_base;
 	struct clk *clk;
 	int active;
 	unsigned int capability;
 	struct device *dev;

 	/* data related to DMA transfers b/w i2s and DMAC */
 	struct i2s_dma_data play_dma_data;
 	struct i2s_dma_data capture_dma_data;
 	struct i2s_clk_config_data config;
 	int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
 };

 static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
 {
 	writel(val, io_base + reg);
 }

 static inline u32 i2s_read_reg(void __iomem *io_base, int reg)
 {
 	return readl(io_base + reg);
 }

 static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
 {
 	u32 i = 0;

 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		for (i = 0; i < 4; i++)
 			i2s_write_reg(dev->i2s_base, TER(i), 0);
 	} else {
 		for (i = 0; i < 4; i++)
 			i2s_write_reg(dev->i2s_base, RER(i), 0);
 	}
 }

 static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
 {
 	u32 i = 0;

 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		for (i = 0; i < 4; i++)
 			i2s_write_reg(dev->i2s_base, TOR(i), 0);
 	} else {
 		for (i = 0; i < 4; i++)
 			i2s_write_reg(dev->i2s_base, ROR(i), 0);
 	}
 }

 static void i2s_start(struct dw_i2s_dev *dev,
 		      struct snd_pcm_substream *substream)
 {

 	i2s_write_reg(dev->i2s_base, IER, 1);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		i2s_write_reg(dev->i2s_base, ITER, 1);
 	else
 		i2s_write_reg(dev->i2s_base, IRER, 1);

 	i2s_write_reg(dev->i2s_base, CER, 1);
 }

 static void i2s_stop(struct dw_i2s_dev *dev,
 		struct snd_pcm_substream *substream)
 {
 	u32 i = 0, irq;

 	i2s_clear_irqs(dev, substream->stream);
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		i2s_write_reg(dev->i2s_base, ITER, 0);

 		for (i = 0; i < 4; i++) {
 			irq = i2s_read_reg(dev->i2s_base, IMR(i));
 			i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x30);
 		}
 	} else {
 		i2s_write_reg(dev->i2s_base, IRER, 0);

 		for (i = 0; i < 4; i++) {
 			irq = i2s_read_reg(dev->i2s_base, IMR(i));
 			i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x03);
 		}
 	}

 	if (!dev->active) {
 		i2s_write_reg(dev->i2s_base, CER, 0);
 		i2s_write_reg(dev->i2s_base, IER, 0);
 	}
 }

 static int dw_i2s_startup(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
 	struct i2s_dma_data *dma_data = NULL;

 	if (!(dev->capability & DWC_I2S_RECORD) &&
 			(substream->stream == SNDRV_PCM_STREAM_CAPTURE))
 		return -EINVAL;

 	if (!(dev->capability & DWC_I2S_PLAY) &&
 			(substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
 		return -EINVAL;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		dma_data = &dev->play_dma_data;
 	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		dma_data = &dev->capture_dma_data;

 	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);

 	return 0;
 }

 static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
 		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 	struct i2s_clk_config_data *config = &dev->config;
 	u32 ccr, xfer_resolution, ch_reg, irq;
 	int ret;

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		config->data_width = 16;
 		ccr = 0x00;
 		xfer_resolution = 0x02;
 		break;

 	case SNDRV_PCM_FORMAT_S24_LE:
 		config->data_width = 24;
 		ccr = 0x08;
 		xfer_resolution = 0x04;
 		break;

 	case SNDRV_PCM_FORMAT_S32_LE:
 		config->data_width = 32;
 		ccr = 0x10;
 		xfer_resolution = 0x05;
 		break;

 	default:
 		dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
 		return -EINVAL;
 	}

 	config->chan_nr = params_channels(params);

 	switch (config->chan_nr) {
 	case EIGHT_CHANNEL_SUPPORT:
 	case SIX_CHANNEL_SUPPORT:
 	case FOUR_CHANNEL_SUPPORT:
 	case TWO_CHANNEL_SUPPORT:
 		break;
 	default:
 		dev_err(dev->dev, "channel not supported\n");
 		return -EINVAL;
 	}

 	i2s_disable_channels(dev, substream->stream);

 	for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			i2s_write_reg(dev->i2s_base, TCR(ch_reg),
 				      xfer_resolution);
 			i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
 			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
 			i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
 		} else {
 			i2s_write_reg(dev->i2s_base, RCR(ch_reg),
 				      xfer_resolution);
 			i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
 			irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
 			i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
 			i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
 		}
 	}

 	i2s_write_reg(dev->i2s_base, CCR, ccr);

 	config->sample_rate = params_rate(params);

 	if (!dev->i2s_clk_cfg)
 		return -EINVAL;

 	ret = dev->i2s_clk_cfg(config);
 	if (ret < 0) {
 		dev_err(dev->dev, "runtime audio clk config fail\n");
 		return ret;
 	}

 	return 0;
 }

 static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *dai)
 {
 	snd_soc_dai_set_dma_data(dai, substream, NULL);
 }

 static int dw_i2s_prepare(struct snd_pcm_substream *substream,
 			  struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		i2s_write_reg(dev->i2s_base, TXFFR, 1);
 	else
 		i2s_write_reg(dev->i2s_base, RXFFR, 1);

 	return 0;
 }

 static int dw_i2s_trigger(struct snd_pcm_substream *substream,
 		int cmd, struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 	int ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		dev->active++;
 		i2s_start(dev, substream);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		dev->active--;
 		i2s_stop(dev, substream);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}
 	return ret;
 }

 static struct snd_soc_dai_ops dw_i2s_dai_ops = {
 	.startup	= dw_i2s_startup,
 	.shutdown	= dw_i2s_shutdown,
 	.hw_params	= dw_i2s_hw_params,
 	.prepare	= dw_i2s_prepare,
 	.trigger	= dw_i2s_trigger,
 };

 static const struct snd_soc_component_driver dw_i2s_component = {
 	.name		= "dw-i2s",
 };

 #ifdef CONFIG_PM

 static int dw_i2s_suspend(struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

 	clk_disable(dev->clk);
 	return 0;
 }

 static int dw_i2s_resume(struct snd_soc_dai *dai)
 {
 	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

 	clk_enable(dev->clk);
 	return 0;
 }

 #else
 #define dw_i2s_suspend	NULL
 #define dw_i2s_resume	NULL
 #endif

 static int dw_i2s_probe(struct platform_device *pdev)
 {
 	const struct i2s_platform_data *pdata = pdev->dev.platform_data;
 	struct dw_i2s_dev *dev;
 	struct resource *res;
 	int ret;
 	unsigned int cap;
 	struct snd_soc_dai_driver *dw_i2s_dai;

 	if (!pdata) {
 		dev_err(&pdev->dev, "Invalid platform data\n");
 		return -EINVAL;
 	}

 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev) {
 		dev_warn(&pdev->dev, "kzalloc fail\n");
 		return -ENOMEM;
 	}

 	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
 	if (!dw_i2s_dai) {
 		dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
 		return -ENOMEM;
 	}

 	dw_i2s_dai->ops = &dw_i2s_dai_ops;
 	dw_i2s_dai->suspend = dw_i2s_suspend;
 	dw_i2s_dai->resume = dw_i2s_resume;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "no i2s resource defined\n");
 		return -ENODEV;
 	}

 	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(dev->i2s_base)) {
 		dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
 		return PTR_ERR(dev->i2s_base);
 	}

 	cap = pdata->cap;
 	dev->capability = cap;
 	dev->i2s_clk_cfg = pdata->i2s_clk_cfg;

 	/* Set DMA slaves info */

 	dev->play_dma_data.data = pdata->play_dma_data;
 	dev->capture_dma_data.data = pdata->capture_dma_data;
 	dev->play_dma_data.addr = res->start + I2S_TXDMA;
 	dev->capture_dma_data.addr = res->start + I2S_RXDMA;
 	dev->play_dma_data.max_burst = 16;
 	dev->capture_dma_data.max_burst = 16;
 	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 	dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
 	dev->play_dma_data.filter = pdata->filter;
 	dev->capture_dma_data.filter = pdata->filter;

 	dev->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dev->clk))
 		return  PTR_ERR(dev->clk);

 	ret = clk_enable(dev->clk);
 	if (ret < 0)
 		goto err_clk_put;

 	if (cap & DWC_I2S_PLAY) {
 		dev_dbg(&pdev->dev, " designware: play supported\n");
 		dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
 		dw_i2s_dai->playback.channels_max = pdata->channel;
 		dw_i2s_dai->playback.formats = pdata->snd_fmts;
 		dw_i2s_dai->playback.rates = pdata->snd_rates;
 	}

 	if (cap & DWC_I2S_RECORD) {
 		dev_dbg(&pdev->dev, "designware: record supported\n");
 		dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
 		dw_i2s_dai->capture.channels_max = pdata->channel;
 		dw_i2s_dai->capture.formats = pdata->snd_fmts;
 		dw_i2s_dai->capture.rates = pdata->snd_rates;
 	}

 	dev->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, dev);
 	ret = snd_soc_register_component(&pdev->dev, &dw_i2s_component,
 					 dw_i2s_dai, 1);
 	if (ret != 0) {
 		dev_err(&pdev->dev, "not able to register dai\n");
 		goto err_clk_disable;
 	}

 	return 0;

 err_clk_disable:
 	clk_disable(dev->clk);
 err_clk_put:
 	clk_put(dev->clk);
 	return ret;
 }

 static int dw_i2s_remove(struct platform_device *pdev)
 {
 	struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);

 	snd_soc_unregister_component(&pdev->dev);

 	clk_put(dev->clk);

 	return 0;
 }

 static struct platform_driver dw_i2s_driver = {
 	.probe		= dw_i2s_probe,
 	.remove		= dw_i2s_remove,
 	.driver		= {
 		.name	= "designware-i2s",
 	},
 };

 module_platform_driver(dw_i2s_driver);

 MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
 MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:designware_i2s");
	/*
	* ALSA SoC Synopsys I2S Audio Layer
	*
	* sound/soc/dwc/designware_i2s.c
	*
	* Copyright (C) 2010 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/clk.h>
	#include <linux/device.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <sound/designware_i2s.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>

	/* common register for all channel */
	#define IER 0x000
	#define IRER 0x004
	#define ITER 0x008
	#define CER 0x00C
	#define CCR 0x010
	#define RXFFR 0x014
	#define TXFFR 0x018

	/* I2STxRxRegisters for all channels */
	#define LRBR_LTHR(x) (0x40 * x + 0x020)
	#define RRBR_RTHR(x) (0x40 * x + 0x024)
	#define RER(x) (0x40 * x + 0x028)
	#define TER(x) (0x40 * x + 0x02C)
	#define RCR(x) (0x40 * x + 0x030)
	#define TCR(x) (0x40 * x + 0x034)
	#define ISR(x) (0x40 * x + 0x038)
	#define IMR(x) (0x40 * x + 0x03C)
	#define ROR(x) (0x40 * x + 0x040)
	#define TOR(x) (0x40 * x + 0x044)
	#define RFCR(x) (0x40 * x + 0x048)
	#define TFCR(x) (0x40 * x + 0x04C)
	#define RFF(x) (0x40 * x + 0x050)
	#define TFF(x) (0x40 * x + 0x054)

	/* I2SCOMPRegisters */
	#define I2S_COMP_PARAM_2 0x01F0
	#define I2S_COMP_PARAM_1 0x01F4
	#define I2S_COMP_VERSION 0x01F8
	#define I2S_COMP_TYPE 0x01FC

	#define MAX_CHANNEL_NUM 8
	#define MIN_CHANNEL_NUM 2

	struct dw_i2s_dev {
	void __iomem *i2s_base;
	struct clk *clk;
	int active;
	unsigned int capability;
	struct device *dev;

	/* data related to DMA transfers b/w i2s and DMAC */
	struct i2s_dma_data play_dma_data;
	struct i2s_dma_data capture_dma_data;
	struct i2s_clk_config_data config;
	int (i2s_clk_cfg)(struct i2s_clk_config_data config);
	};

	static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
	{
	writel(val, io_base + reg);
	}

	static inline u32 i2s_read_reg(void __iomem *io_base, int reg)
	{
	return readl(io_base + reg);
	}

	static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
	{
	u32 i = 0;

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
	for (i = 0; i < 4; i++)
	i2s_write_reg(dev->i2s_base, TER(i), 0);
	} else {
	for (i = 0; i < 4; i++)
	i2s_write_reg(dev->i2s_base, RER(i), 0);
	}
	}

	static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
	{
	u32 i = 0;

	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
	for (i = 0; i < 4; i++)
	i2s_write_reg(dev->i2s_base, TOR(i), 0);
	} else {
	for (i = 0; i < 4; i++)
	i2s_write_reg(dev->i2s_base, ROR(i), 0);
	}
	}

	static void i2s_start(struct dw_i2s_dev *dev,
	struct snd_pcm_substream *substream)
	{

	i2s_write_reg(dev->i2s_base, IER, 1);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	i2s_write_reg(dev->i2s_base, ITER, 1);
	else
	i2s_write_reg(dev->i2s_base, IRER, 1);

	i2s_write_reg(dev->i2s_base, CER, 1);
	}

	static void i2s_stop(struct dw_i2s_dev *dev,
	struct snd_pcm_substream *substream)
	{
	u32 i = 0, irq;

	i2s_clear_irqs(dev, substream->stream);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	i2s_write_reg(dev->i2s_base, ITER, 0);

	for (i = 0; i < 4; i++) {
	irq = i2s_read_reg(dev->i2s_base, IMR(i));
	i2s_write_reg(dev->i2s_base, IMR(i), irq \| 0x30);
	}
	} else {
	i2s_write_reg(dev->i2s_base, IRER, 0);

	for (i = 0; i < 4; i++) {
	irq = i2s_read_reg(dev->i2s_base, IMR(i));
	i2s_write_reg(dev->i2s_base, IMR(i), irq \| 0x03);
	}
	}

	if (!dev->active) {
	i2s_write_reg(dev->i2s_base, CER, 0);
	i2s_write_reg(dev->i2s_base, IER, 0);
	}
	}

	static int dw_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *cpu_dai)
	{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
	struct i2s_dma_data *dma_data = NULL;

	if (!(dev->capability & DWC_I2S_RECORD) &&
	(substream->stream == SNDRV_PCM_STREAM_CAPTURE))
	return -EINVAL;

	if (!(dev->capability & DWC_I2S_PLAY) &&
	(substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
	return -EINVAL;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	dma_data = &dev->play_dma_data;
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	dma_data = &dev->capture_dma_data;

	snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);

	return 0;
	}

	static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params params, struct snd_soc_dai dai)
	{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
	struct i2s_clk_config_data *config = &dev->config;
	u32 ccr, xfer_resolution, ch_reg, irq;
	int ret;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	config->data_width = 16;
	ccr = 0x00;
	xfer_resolution = 0x02;
	break;

	case SNDRV_PCM_FORMAT_S24_LE:
	config->data_width = 24;
	ccr = 0x08;
	xfer_resolution = 0x04;
	break;

	case SNDRV_PCM_FORMAT_S32_LE:
	config->data_width = 32;
	ccr = 0x10;
	xfer_resolution = 0x05;
	break;

	default:
	dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
	return -EINVAL;
	}

	config->chan_nr = params_channels(params);

	switch (config->chan_nr) {
	case EIGHT_CHANNEL_SUPPORT:
	case SIX_CHANNEL_SUPPORT:
	case FOUR_CHANNEL_SUPPORT:
	case TWO_CHANNEL_SUPPORT:
	break;
	default:
	dev_err(dev->dev, "channel not supported\n");
	return -EINVAL;
	}

	i2s_disable_channels(dev, substream->stream);

	for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	i2s_write_reg(dev->i2s_base, TCR(ch_reg),
	xfer_resolution);
	i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
	irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
	i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
	i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
	} else {
	i2s_write_reg(dev->i2s_base, RCR(ch_reg),
	xfer_resolution);
	i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
	irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
	i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
	i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
	}
	}

	i2s_write_reg(dev->i2s_base, CCR, ccr);

	config->sample_rate = params_rate(params);

	if (!dev->i2s_clk_cfg)
	return -EINVAL;

	ret = dev->i2s_clk_cfg(config);
	if (ret < 0) {
	dev_err(dev->dev, "runtime audio clk config fail\n");
	return ret;
	}

	return 0;
	}

	static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	snd_soc_dai_set_dma_data(dai, substream, NULL);
	}

	static int dw_i2s_prepare(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	i2s_write_reg(dev->i2s_base, TXFFR, 1);
	else
	i2s_write_reg(dev->i2s_base, RXFFR, 1);

	return 0;
	}

	static int dw_i2s_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	dev->active++;
	i2s_start(dev, substream);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	dev->active--;
	i2s_stop(dev, substream);
	break;
	default:
	ret = -EINVAL;
	break;
	}
	return ret;
	}

	static struct snd_soc_dai_ops dw_i2s_dai_ops = {
	.startup = dw_i2s_startup,
	.shutdown = dw_i2s_shutdown,
	.hw_params = dw_i2s_hw_params,
	.prepare = dw_i2s_prepare,
	.trigger = dw_i2s_trigger,
	};

	static const struct snd_soc_component_driver dw_i2s_component = {
	.name = "dw-i2s",
	};

	#ifdef CONFIG_PM

	static int dw_i2s_suspend(struct snd_soc_dai *dai)
	{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

	clk_disable(dev->clk);
	return 0;
	}

	static int dw_i2s_resume(struct snd_soc_dai *dai)
	{
	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);

	clk_enable(dev->clk);
	return 0;
	}

	#else
	#define dw_i2s_suspend NULL
	#define dw_i2s_resume NULL
	#endif

	static int dw_i2s_probe(struct platform_device *pdev)
	{
	const struct i2s_platform_data *pdata = pdev->dev.platform_data;
	struct dw_i2s_dev *dev;
	struct resource *res;
	int ret;
	unsigned int cap;
	struct snd_soc_dai_driver *dw_i2s_dai;

	if (!pdata) {
	dev_err(&pdev->dev, "Invalid platform data\n");
	return -EINVAL;
	}

	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev) {
	dev_warn(&pdev->dev, "kzalloc fail\n");
	return -ENOMEM;
	}

	dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
	if (!dw_i2s_dai) {
	dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
	return -ENOMEM;
	}

	dw_i2s_dai->ops = &dw_i2s_dai_ops;
	dw_i2s_dai->suspend = dw_i2s_suspend;
	dw_i2s_dai->resume = dw_i2s_resume;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
	dev_err(&pdev->dev, "no i2s resource defined\n");
	return -ENODEV;
	}

	dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(dev->i2s_base)) {
	dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
	return PTR_ERR(dev->i2s_base);
	}

	cap = pdata->cap;
	dev->capability = cap;
	dev->i2s_clk_cfg = pdata->i2s_clk_cfg;

	/* Set DMA slaves info */

	dev->play_dma_data.data = pdata->play_dma_data;
	dev->capture_dma_data.data = pdata->capture_dma_data;
	dev->play_dma_data.addr = res->start + I2S_TXDMA;
	dev->capture_dma_data.addr = res->start + I2S_RXDMA;
	dev->play_dma_data.max_burst = 16;
	dev->capture_dma_data.max_burst = 16;
	dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
	dev->play_dma_data.filter = pdata->filter;
	dev->capture_dma_data.filter = pdata->filter;

	dev->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(dev->clk))
	return PTR_ERR(dev->clk);

	ret = clk_enable(dev->clk);
	if (ret < 0)
	goto err_clk_put;

	if (cap & DWC_I2S_PLAY) {
	dev_dbg(&pdev->dev, " designware: play supported\n");
	dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
	dw_i2s_dai->playback.channels_max = pdata->channel;
	dw_i2s_dai->playback.formats = pdata->snd_fmts;
	dw_i2s_dai->playback.rates = pdata->snd_rates;
	}

	if (cap & DWC_I2S_RECORD) {
	dev_dbg(&pdev->dev, "designware: record supported\n");
	dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
	dw_i2s_dai->capture.channels_max = pdata->channel;
	dw_i2s_dai->capture.formats = pdata->snd_fmts;
	dw_i2s_dai->capture.rates = pdata->snd_rates;
	}

	dev->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, dev);
	ret = snd_soc_register_component(&pdev->dev, &dw_i2s_component,
	dw_i2s_dai, 1);
	if (ret != 0) {
	dev_err(&pdev->dev, "not able to register dai\n");
	goto err_clk_disable;
	}

	return 0;

	err_clk_disable:
	clk_disable(dev->clk);
	err_clk_put:
	clk_put(dev->clk);
	return ret;
	}

	static int dw_i2s_remove(struct platform_device *pdev)
	{
	struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_component(&pdev->dev);

	clk_put(dev->clk);

	return 0;
	}

	static struct platform_driver dw_i2s_driver = {
	.probe = dw_i2s_probe,
	.remove = dw_i2s_remove,
	.driver = {
	.name = "designware-i2s",
	},
	};

	module_platform_driver(dw_i2s_driver);

	MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
	MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:designware_i2s");