sound/soc/kirkwood/kirkwood-i2s.c - kernel/msm-4.19 - Gitiles

 /*
  * kirkwood-i2s.c
  *
  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
  *
  *  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.
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/mbus.h>
 #include <linux/delay.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <plat/audio.h>
 #include "kirkwood.h"

 #define DRV_NAME	"kirkwood-i2s"

 #define KIRKWOOD_I2S_RATES \
 	(SNDRV_PCM_RATE_44100 | \
 	 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
 #define KIRKWOOD_I2S_FORMATS \
 	(SNDRV_PCM_FMTBIT_S16_LE | \
 	 SNDRV_PCM_FMTBIT_S24_LE | \
 	 SNDRV_PCM_FMTBIT_S32_LE)

 static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
 		unsigned int fmt)
 {
 	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
 	unsigned long mask;
 	unsigned long value;

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_RIGHT_J:
 		mask = KIRKWOOD_I2S_CTL_RJ;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		mask = KIRKWOOD_I2S_CTL_LJ;
 		break;
 	case SND_SOC_DAIFMT_I2S:
 		mask = KIRKWOOD_I2S_CTL_I2S;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/*
 	 * Set same format for playback and record
 	 * This avoids some troubles.
 	 */
 	value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
 	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
 	value |= mask;
 	writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);

 	value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
 	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
 	value |= mask;
 	writel(value, priv->io+KIRKWOOD_I2S_RECCTL);

 	return 0;
 }

 static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
 {
 	unsigned long value;

 	value = KIRKWOOD_DCO_CTL_OFFSET_0;
 	switch (rate) {
 	default:
 	case 44100:
 		value |= KIRKWOOD_DCO_CTL_FREQ_11;
 		break;
 	case 48000:
 		value |= KIRKWOOD_DCO_CTL_FREQ_12;
 		break;
 	case 96000:
 		value |= KIRKWOOD_DCO_CTL_FREQ_24;
 		break;
 	}
 	writel(value, io + KIRKWOOD_DCO_CTL);

 	/* wait for dco locked */
 	do {
 		cpu_relax();
 		value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
 		value &= KIRKWOOD_DCO_SPCR_STATUS;
 	} while (value == 0);
 }

 static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *dai)
 {
 	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);

 	snd_soc_dai_set_dma_data(dai, substream, priv);
 	return 0;
 }

 static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params,
 				 struct snd_soc_dai *dai)
 {
 	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 	unsigned int i2s_reg, reg;
 	unsigned long i2s_value, value;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		i2s_reg = KIRKWOOD_I2S_PLAYCTL;
 		reg = KIRKWOOD_PLAYCTL;
 	} else {
 		i2s_reg = KIRKWOOD_I2S_RECCTL;
 		reg = KIRKWOOD_RECCTL;
 	}

 	/* set dco conf */
 	kirkwood_set_dco(priv->io, params_rate(params));

 	i2s_value = readl(priv->io+i2s_reg);
 	i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;

 	value = readl(priv->io+reg);
 	value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;

 	/*
 	 * Size settings in play/rec i2s control regs and play/rec control
 	 * regs must be the same.
 	 */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
 		value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
 		break;
 	/*
 	 * doesn't work... S20_3LE != kirkwood 20bit format ?
 	 *
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
 		value |= KIRKWOOD_PLAYCTL_SIZE_20;
 		break;
 	*/
 	case SNDRV_PCM_FORMAT_S24_LE:
 		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
 		value |= KIRKWOOD_PLAYCTL_SIZE_24;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
 		value |= KIRKWOOD_PLAYCTL_SIZE_32;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
 		if (params_channels(params) == 1)
 			value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
 		else
 			value |= KIRKWOOD_PLAYCTL_MONO_OFF;
 	}

 	writel(i2s_value, priv->io+i2s_reg);
 	writel(value, priv->io+reg);

 	return 0;
 }

 static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
 				int cmd, struct snd_soc_dai *dai)
 {
 	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 	unsigned long value;

 	/*
 	 * specs says KIRKWOOD_PLAYCTL must be read 2 times before
 	 * changing it. So read 1 time here and 1 later.
 	 */
 	value = readl(priv->io + KIRKWOOD_PLAYCTL);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		/* stop audio, enable interrupts */
 		value = readl(priv->io + KIRKWOOD_PLAYCTL);
 		value |= KIRKWOOD_PLAYCTL_PAUSE;
 		writel(value, priv->io + KIRKWOOD_PLAYCTL);

 		value = readl(priv->io + KIRKWOOD_INT_MASK);
 		value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 		writel(value, priv->io + KIRKWOOD_INT_MASK);

 		/* configure audio & enable i2s playback */
 		value = readl(priv->io + KIRKWOOD_PLAYCTL);
 		value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
 		value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE
 				| KIRKWOOD_PLAYCTL_SPDIF_EN);

 		if (priv->burst == 32)
 			value |= KIRKWOOD_PLAYCTL_BURST_32;
 		else
 			value |= KIRKWOOD_PLAYCTL_BURST_128;
 		value |= KIRKWOOD_PLAYCTL_I2S_EN;
 		writel(value, priv->io + KIRKWOOD_PLAYCTL);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 		/* stop audio, disable interrupts */
 		value = readl(priv->io + KIRKWOOD_PLAYCTL);
 		value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
 		writel(value, priv->io + KIRKWOOD_PLAYCTL);

 		value = readl(priv->io + KIRKWOOD_INT_MASK);
 		value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 		writel(value, priv->io + KIRKWOOD_INT_MASK);

 		/* disable all playbacks */
 		value = readl(priv->io + KIRKWOOD_PLAYCTL);
 		value &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
 		writel(value, priv->io + KIRKWOOD_PLAYCTL);
 		break;

 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		value = readl(priv->io + KIRKWOOD_PLAYCTL);
 		value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
 		writel(value, priv->io + KIRKWOOD_PLAYCTL);
 		break;

 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		value = readl(priv->io + KIRKWOOD_PLAYCTL);
 		value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
 		writel(value, priv->io + KIRKWOOD_PLAYCTL);
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
 				int cmd, struct snd_soc_dai *dai)
 {
 	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 	unsigned long value;

 	value = readl(priv->io + KIRKWOOD_RECCTL);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		/* stop audio, enable interrupts */
 		value = readl(priv->io + KIRKWOOD_RECCTL);
 		value |= KIRKWOOD_RECCTL_PAUSE;
 		writel(value, priv->io + KIRKWOOD_RECCTL);

 		value = readl(priv->io + KIRKWOOD_INT_MASK);
 		value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
 		writel(value, priv->io + KIRKWOOD_INT_MASK);

 		/* configure audio & enable i2s record */
 		value = readl(priv->io + KIRKWOOD_RECCTL);
 		value &= ~KIRKWOOD_RECCTL_BURST_MASK;
 		value &= ~KIRKWOOD_RECCTL_MONO;
 		value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE
 			| KIRKWOOD_RECCTL_SPDIF_EN);

 		if (priv->burst == 32)
 			value |= KIRKWOOD_RECCTL_BURST_32;
 		else
 			value |= KIRKWOOD_RECCTL_BURST_128;
 		value |= KIRKWOOD_RECCTL_I2S_EN;

 		writel(value, priv->io + KIRKWOOD_RECCTL);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 		/* stop audio, disable interrupts */
 		value = readl(priv->io + KIRKWOOD_RECCTL);
 		value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 		writel(value, priv->io + KIRKWOOD_RECCTL);

 		value = readl(priv->io + KIRKWOOD_INT_MASK);
 		value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
 		writel(value, priv->io + KIRKWOOD_INT_MASK);

 		/* disable all records */
 		value = readl(priv->io + KIRKWOOD_RECCTL);
 		value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 		writel(value, priv->io + KIRKWOOD_RECCTL);
 		break;

 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		value = readl(priv->io + KIRKWOOD_RECCTL);
 		value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 		writel(value, priv->io + KIRKWOOD_RECCTL);
 		break;

 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		value = readl(priv->io + KIRKWOOD_RECCTL);
 		value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
 		writel(value, priv->io + KIRKWOOD_RECCTL);
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 			       struct snd_soc_dai *dai)
 {
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		return kirkwood_i2s_play_trigger(substream, cmd, dai);
 	else
 		return kirkwood_i2s_rec_trigger(substream, cmd, dai);

 	return 0;
 }

 static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
 {
 	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 	unsigned long value;
 	unsigned int reg_data;

 	/* put system in a "safe" state : */
 	/* disable audio interrupts */
 	writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
 	writel(0, priv->io + KIRKWOOD_INT_MASK);

 	reg_data = readl(priv->io + 0x1200);
 	reg_data &= (~(0x333FF8));
 	reg_data |= 0x111D18;
 	writel(reg_data, priv->io + 0x1200);

 	msleep(500);

 	reg_data = readl(priv->io + 0x1200);
 	reg_data &= (~(0x333FF8));
 	reg_data |= 0x111D18;
 	writel(reg_data, priv->io + 0x1200);

 	/* disable playback/record */
 	value = readl(priv->io + KIRKWOOD_PLAYCTL);
 	value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
 	writel(value, priv->io + KIRKWOOD_PLAYCTL);

 	value = readl(priv->io + KIRKWOOD_RECCTL);
 	value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 	writel(value, priv->io + KIRKWOOD_RECCTL);

 	return 0;

 }

 static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
 {
 	return 0;
 }

 static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
 	.startup	= kirkwood_i2s_startup,
 	.trigger	= kirkwood_i2s_trigger,
 	.hw_params      = kirkwood_i2s_hw_params,
 	.set_fmt        = kirkwood_i2s_set_fmt,
 };


 static struct snd_soc_dai_driver kirkwood_i2s_dai = {
 	.probe = kirkwood_i2s_probe,
 	.remove = kirkwood_i2s_remove,
 	.playback = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = KIRKWOOD_I2S_RATES,
 		.formats = KIRKWOOD_I2S_FORMATS,},
 	.capture = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = KIRKWOOD_I2S_RATES,
 		.formats = KIRKWOOD_I2S_FORMATS,},
 	.ops = &kirkwood_i2s_dai_ops,
 };

 static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 {
 	struct resource *mem;
 	struct kirkwood_asoc_platform_data *data =
 		pdev->dev.platform_data;
 	struct kirkwood_dma_data *priv;
 	int err;

 	priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
 	if (!priv) {
 		dev_err(&pdev->dev, "allocation failed\n");
 		err = -ENOMEM;
 		goto error;
 	}
 	dev_set_drvdata(&pdev->dev, priv);

 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem) {
 		dev_err(&pdev->dev, "platform_get_resource failed\n");
 		err = -ENXIO;
 		goto err_alloc;
 	}

 	priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
 	if (!priv->mem) {
 		dev_err(&pdev->dev, "request_mem_region failed\n");
 		err = -EBUSY;
 		goto err_alloc;
 	}

 	priv->io = ioremap(priv->mem->start, SZ_16K);
 	if (!priv->io) {
 		dev_err(&pdev->dev, "ioremap failed\n");
 		err = -ENOMEM;
 		goto err_iomem;
 	}

 	priv->irq = platform_get_irq(pdev, 0);
 	if (priv->irq <= 0) {
 		dev_err(&pdev->dev, "platform_get_irq failed\n");
 		err = -ENXIO;
 		goto err_ioremap;
 	}

 	if (!data) {
 		dev_err(&pdev->dev, "no platform data ?!\n");
 		err = -EINVAL;
 		goto err_ioremap;
 	}

 	priv->burst = data->burst;

 	return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);

 err_ioremap:
 	iounmap(priv->io);
 err_iomem:
 	release_mem_region(priv->mem->start, SZ_16K);
 err_alloc:
 	kfree(priv);
 error:
 	return err;
 }

 static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
 {
 	struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);

 	snd_soc_unregister_dai(&pdev->dev);
 	iounmap(priv->io);
 	release_mem_region(priv->mem->start, SZ_16K);
 	kfree(priv);

 	return 0;
 }

 static struct platform_driver kirkwood_i2s_driver = {
 	.probe  = kirkwood_i2s_dev_probe,
 	.remove = __devexit_p(kirkwood_i2s_dev_remove),
 	.driver = {
 		.name = DRV_NAME,
 		.owner = THIS_MODULE,
 	},
 };

 module_platform_driver(kirkwood_i2s_driver);

 /* Module information */
 MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
 MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:kirkwood-i2s");
	/*
	* kirkwood-i2s.c
	*
	* (c) 2010 Arnaud Patard <apatard@mandriva.com>
	* (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
	*
	* 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.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/mbus.h>
	#include <linux/delay.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <plat/audio.h>
	#include "kirkwood.h"

	#define DRV_NAME "kirkwood-i2s"

	#define KIRKWOOD_I2S_RATES \
	(SNDRV_PCM_RATE_44100 \| \
	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_96000)
	#define KIRKWOOD_I2S_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE \| \
	SNDRV_PCM_FMTBIT_S24_LE \| \
	SNDRV_PCM_FMTBIT_S32_LE)

	static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
	unsigned int fmt)
	{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
	unsigned long mask;
	unsigned long value;

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
	mask = KIRKWOOD_I2S_CTL_RJ;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	mask = KIRKWOOD_I2S_CTL_LJ;
	break;
	case SND_SOC_DAIFMT_I2S:
	mask = KIRKWOOD_I2S_CTL_I2S;
	break;
	default:
	return -EINVAL;
	}

	/*
	* Set same format for playback and record
	* This avoids some troubles.
	*/
	value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	value \|= mask;
	writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);

	value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	value \|= mask;
	writel(value, priv->io+KIRKWOOD_I2S_RECCTL);

	return 0;
	}

	static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
	{
	unsigned long value;

	value = KIRKWOOD_DCO_CTL_OFFSET_0;
	switch (rate) {
	default:
	case 44100:
	value \|= KIRKWOOD_DCO_CTL_FREQ_11;
	break;
	case 48000:
	value \|= KIRKWOOD_DCO_CTL_FREQ_12;
	break;
	case 96000:
	value \|= KIRKWOOD_DCO_CTL_FREQ_24;
	break;
	}
	writel(value, io + KIRKWOOD_DCO_CTL);

	/* wait for dco locked */
	do {
	cpu_relax();
	value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
	value &= KIRKWOOD_DCO_SPCR_STATUS;
	} while (value == 0);
	}

	static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_set_dma_data(dai, substream, priv);
	return 0;
	}

	static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned int i2s_reg, reg;
	unsigned long i2s_value, value;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	i2s_reg = KIRKWOOD_I2S_PLAYCTL;
	reg = KIRKWOOD_PLAYCTL;
	} else {
	i2s_reg = KIRKWOOD_I2S_RECCTL;
	reg = KIRKWOOD_RECCTL;
	}

	/* set dco conf */
	kirkwood_set_dco(priv->io, params_rate(params));

	i2s_value = readl(priv->io+i2s_reg);
	i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;

	value = readl(priv->io+reg);
	value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;

	/*
	* Size settings in play/rec i2s control regs and play/rec control
	* regs must be the same.
	*/
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_16;
	value \|= KIRKWOOD_PLAYCTL_SIZE_16_C;
	break;
	/*
	* doesn't work... S20_3LE != kirkwood 20bit format ?
	*
	case SNDRV_PCM_FORMAT_S20_3LE:
	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_20;
	value \|= KIRKWOOD_PLAYCTL_SIZE_20;
	break;
	*/
	case SNDRV_PCM_FORMAT_S24_LE:
	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_24;
	value \|= KIRKWOOD_PLAYCTL_SIZE_24;
	break;
	case SNDRV_PCM_FORMAT_S32_LE:
	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_32;
	value \|= KIRKWOOD_PLAYCTL_SIZE_32;
	break;
	default:
	return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
	if (params_channels(params) == 1)
	value \|= KIRKWOOD_PLAYCTL_MONO_BOTH;
	else
	value \|= KIRKWOOD_PLAYCTL_MONO_OFF;
	}

	writel(i2s_value, priv->io+i2s_reg);
	writel(value, priv->io+reg);

	return 0;
	}

	static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned long value;

	/*
	* specs says KIRKWOOD_PLAYCTL must be read 2 times before
	* changing it. So read 1 time here and 1 later.
	*/
	value = readl(priv->io + KIRKWOOD_PLAYCTL);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	/* stop audio, enable interrupts */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value \|= KIRKWOOD_PLAYCTL_PAUSE;
	writel(value, priv->io + KIRKWOOD_PLAYCTL);

	value = readl(priv->io + KIRKWOOD_INT_MASK);
	value \|= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
	writel(value, priv->io + KIRKWOOD_INT_MASK);

	/* configure audio & enable i2s playback */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
	value &= ~(KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE
	\| KIRKWOOD_PLAYCTL_SPDIF_EN);

	if (priv->burst == 32)
	value \|= KIRKWOOD_PLAYCTL_BURST_32;
	else
	value \|= KIRKWOOD_PLAYCTL_BURST_128;
	value \|= KIRKWOOD_PLAYCTL_I2S_EN;
	writel(value, priv->io + KIRKWOOD_PLAYCTL);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	/* stop audio, disable interrupts */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value \|= KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE;
	writel(value, priv->io + KIRKWOOD_PLAYCTL);

	value = readl(priv->io + KIRKWOOD_INT_MASK);
	value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
	writel(value, priv->io + KIRKWOOD_INT_MASK);

	/* disable all playbacks */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value &= ~(KIRKWOOD_PLAYCTL_I2S_EN \| KIRKWOOD_PLAYCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_PLAYCTL);
	break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value \|= KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE;
	writel(value, priv->io + KIRKWOOD_PLAYCTL);
	break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value &= ~(KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE);
	writel(value, priv->io + KIRKWOOD_PLAYCTL);
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned long value;

	value = readl(priv->io + KIRKWOOD_RECCTL);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	/* stop audio, enable interrupts */
	value = readl(priv->io + KIRKWOOD_RECCTL);
	value \|= KIRKWOOD_RECCTL_PAUSE;
	writel(value, priv->io + KIRKWOOD_RECCTL);

	value = readl(priv->io + KIRKWOOD_INT_MASK);
	value \|= KIRKWOOD_INT_CAUSE_REC_BYTES;
	writel(value, priv->io + KIRKWOOD_INT_MASK);

	/* configure audio & enable i2s record */
	value = readl(priv->io + KIRKWOOD_RECCTL);
	value &= ~KIRKWOOD_RECCTL_BURST_MASK;
	value &= ~KIRKWOOD_RECCTL_MONO;
	value &= ~(KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE
	\| KIRKWOOD_RECCTL_SPDIF_EN);

	if (priv->burst == 32)
	value \|= KIRKWOOD_RECCTL_BURST_32;
	else
	value \|= KIRKWOOD_RECCTL_BURST_128;
	value \|= KIRKWOOD_RECCTL_I2S_EN;

	writel(value, priv->io + KIRKWOOD_RECCTL);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	/* stop audio, disable interrupts */
	value = readl(priv->io + KIRKWOOD_RECCTL);
	value \|= KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE;
	writel(value, priv->io + KIRKWOOD_RECCTL);

	value = readl(priv->io + KIRKWOOD_INT_MASK);
	value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
	writel(value, priv->io + KIRKWOOD_INT_MASK);

	/* disable all records */
	value = readl(priv->io + KIRKWOOD_RECCTL);
	value &= ~(KIRKWOOD_RECCTL_I2S_EN \| KIRKWOOD_RECCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_RECCTL);
	break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	value = readl(priv->io + KIRKWOOD_RECCTL);
	value \|= KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE;
	writel(value, priv->io + KIRKWOOD_RECCTL);
	break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	value = readl(priv->io + KIRKWOOD_RECCTL);
	value &= ~(KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE);
	writel(value, priv->io + KIRKWOOD_RECCTL);
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	return kirkwood_i2s_play_trigger(substream, cmd, dai);
	else
	return kirkwood_i2s_rec_trigger(substream, cmd, dai);

	return 0;
	}

	static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
	{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned long value;
	unsigned int reg_data;

	/* put system in a "safe" state : */
	/* disable audio interrupts */
	writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
	writel(0, priv->io + KIRKWOOD_INT_MASK);

	reg_data = readl(priv->io + 0x1200);
	reg_data &= (~(0x333FF8));
	reg_data \|= 0x111D18;
	writel(reg_data, priv->io + 0x1200);

	msleep(500);

	reg_data = readl(priv->io + 0x1200);
	reg_data &= (~(0x333FF8));
	reg_data \|= 0x111D18;
	writel(reg_data, priv->io + 0x1200);

	/* disable playback/record */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value &= ~(KIRKWOOD_PLAYCTL_I2S_EN\|KIRKWOOD_PLAYCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_PLAYCTL);

	value = readl(priv->io + KIRKWOOD_RECCTL);
	value &= ~(KIRKWOOD_RECCTL_I2S_EN \| KIRKWOOD_RECCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_RECCTL);

	return 0;

	}

	static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
	{
	return 0;
	}

	static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
	.startup = kirkwood_i2s_startup,
	.trigger = kirkwood_i2s_trigger,
	.hw_params = kirkwood_i2s_hw_params,
	.set_fmt = kirkwood_i2s_set_fmt,
	};


	static struct snd_soc_dai_driver kirkwood_i2s_dai = {
	.probe = kirkwood_i2s_probe,
	.remove = kirkwood_i2s_remove,
	.playback = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = KIRKWOOD_I2S_RATES,
	.formats = KIRKWOOD_I2S_FORMATS,},
	.capture = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = KIRKWOOD_I2S_RATES,
	.formats = KIRKWOOD_I2S_FORMATS,},
	.ops = &kirkwood_i2s_dai_ops,
	};

	static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
	{
	struct resource *mem;
	struct kirkwood_asoc_platform_data *data =
	pdev->dev.platform_data;
	struct kirkwood_dma_data *priv;
	int err;

	priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
	if (!priv) {
	dev_err(&pdev->dev, "allocation failed\n");
	err = -ENOMEM;
	goto error;
	}
	dev_set_drvdata(&pdev->dev, priv);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
	dev_err(&pdev->dev, "platform_get_resource failed\n");
	err = -ENXIO;
	goto err_alloc;
	}

	priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
	if (!priv->mem) {
	dev_err(&pdev->dev, "request_mem_region failed\n");
	err = -EBUSY;
	goto err_alloc;
	}

	priv->io = ioremap(priv->mem->start, SZ_16K);
	if (!priv->io) {
	dev_err(&pdev->dev, "ioremap failed\n");
	err = -ENOMEM;
	goto err_iomem;
	}

	priv->irq = platform_get_irq(pdev, 0);
	if (priv->irq <= 0) {
	dev_err(&pdev->dev, "platform_get_irq failed\n");
	err = -ENXIO;
	goto err_ioremap;
	}

	if (!data) {
	dev_err(&pdev->dev, "no platform data ?!\n");
	err = -EINVAL;
	goto err_ioremap;
	}

	priv->burst = data->burst;

	return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);

	err_ioremap:
	iounmap(priv->io);
	err_iomem:
	release_mem_region(priv->mem->start, SZ_16K);
	err_alloc:
	kfree(priv);
	error:
	return err;
	}

	static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
	{
	struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_dai(&pdev->dev);
	iounmap(priv->io);
	release_mem_region(priv->mem->start, SZ_16K);
	kfree(priv);

	return 0;
	}

	static struct platform_driver kirkwood_i2s_driver = {
	.probe = kirkwood_i2s_dev_probe,
	.remove = __devexit_p(kirkwood_i2s_dev_remove),
	.driver = {
	.name = DRV_NAME,
	.owner = THIS_MODULE,
	},
	};

	module_platform_driver(kirkwood_i2s_driver);

	/* Module information */
	MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
	MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:kirkwood-i2s");