sound/soc/jz4740/jz4740-i2s.c - linux - Git at Google

 /*
  *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  *
  *  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.
  *
  *  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.,
  *  675 Mass Ave, Cambridge, MA 02139, USA.
  *
  */

 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>

 #include <linux/clk.h>
 #include <linux/delay.h>

 #include <linux/dma-mapping.h>

 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/initval.h>

 #include "jz4740-i2s.h"
 #include "jz4740-pcm.h"

 #define JZ_REG_AIC_CONF		0x00
 #define JZ_REG_AIC_CTRL		0x04
 #define JZ_REG_AIC_I2S_FMT	0x10
 #define JZ_REG_AIC_FIFO_STATUS	0x14
 #define JZ_REG_AIC_I2S_STATUS	0x1c
 #define JZ_REG_AIC_CLK_DIV	0x30
 #define JZ_REG_AIC_FIFO		0x34

 #define JZ_AIC_CONF_FIFO_RX_THRESHOLD_MASK (0xf << 12)
 #define JZ_AIC_CONF_FIFO_TX_THRESHOLD_MASK (0xf <<  8)
 #define JZ_AIC_CONF_OVERFLOW_PLAY_LAST BIT(6)
 #define JZ_AIC_CONF_INTERNAL_CODEC BIT(5)
 #define JZ_AIC_CONF_I2S BIT(4)
 #define JZ_AIC_CONF_RESET BIT(3)
 #define JZ_AIC_CONF_BIT_CLK_MASTER BIT(2)
 #define JZ_AIC_CONF_SYNC_CLK_MASTER BIT(1)
 #define JZ_AIC_CONF_ENABLE BIT(0)

 #define JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET 12
 #define JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET 8

 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK (0x7 << 19)
 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK (0x7 << 16)
 #define JZ_AIC_CTRL_ENABLE_RX_DMA BIT(15)
 #define JZ_AIC_CTRL_ENABLE_TX_DMA BIT(14)
 #define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11)
 #define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10)
 #define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9)
 #define JZ_AIC_CTRL_FLUSH		BIT(8)
 #define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6)
 #define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5)
 #define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4)
 #define JZ_AIC_CTRL_ENABLE_TFS_INT BIT(3)
 #define JZ_AIC_CTRL_ENABLE_LOOPBACK BIT(2)
 #define JZ_AIC_CTRL_ENABLE_PLAYBACK BIT(1)
 #define JZ_AIC_CTRL_ENABLE_CAPTURE BIT(0)

 #define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET 19
 #define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET  16

 #define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK BIT(12)
 #define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK BIT(4)
 #define JZ_AIC_I2S_FMT_MSB BIT(0)

 #define JZ_AIC_I2S_STATUS_BUSY BIT(2)

 #define JZ_AIC_CLK_DIV_MASK 0xf

 struct jz4740_i2s {
 	struct resource *mem;
 	void __iomem *base;
 	dma_addr_t phys_base;

 	struct clk *clk_aic;
 	struct clk *clk_i2s;

 	struct jz4740_pcm_config pcm_config_playback;
 	struct jz4740_pcm_config pcm_config_capture;
 };

 static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s,
 	unsigned int reg)
 {
 	return readl(i2s->base + reg);
 }

 static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s,
 	unsigned int reg, uint32_t value)
 {
 	writel(value, i2s->base + reg);
 }

 static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t conf, ctrl;

 	if (dai->active)
 		return 0;

 	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
 	ctrl |= JZ_AIC_CTRL_FLUSH;
 	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);

 	clk_enable(i2s->clk_i2s);

 	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 	conf |= JZ_AIC_CONF_ENABLE;
 	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

 	return 0;
 }

 static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t conf;

 	if (dai->active)
 		return;

 	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 	conf &= ~JZ_AIC_CONF_ENABLE;
 	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

 	clk_disable(i2s->clk_i2s);
 }

 static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 	struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	uint32_t ctrl;
 	uint32_t mask;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		mask = JZ_AIC_CTRL_ENABLE_PLAYBACK | JZ_AIC_CTRL_ENABLE_TX_DMA;
 	else
 		mask = JZ_AIC_CTRL_ENABLE_CAPTURE | JZ_AIC_CTRL_ENABLE_RX_DMA;

 	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		ctrl |= mask;
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		ctrl &= ~mask;
 		break;
 	default:
 		return -EINVAL;
 	}

 	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);

 	return 0;
 }

 static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	uint32_t format = 0;
 	uint32_t conf;

 	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);

 	conf &= ~(JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER);

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		conf |= JZ_AIC_CONF_BIT_CLK_MASTER | JZ_AIC_CONF_SYNC_CLK_MASTER;
 		format |= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFS:
 		conf |= JZ_AIC_CONF_SYNC_CLK_MASTER;
 		break;
 	case SND_SOC_DAIFMT_CBS_CFM:
 		conf |= JZ_AIC_CONF_BIT_CLK_MASTER;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_MSB:
 		format |= JZ_AIC_I2S_FMT_MSB;
 		break;
 	case SND_SOC_DAIFMT_I2S:
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	default:
 		return -EINVAL;
 	}

 	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 	jz4740_i2s_write(i2s, JZ_REG_AIC_I2S_FMT, format);

 	return 0;
 }

 static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	enum jz4740_dma_width dma_width;
 	struct jz4740_pcm_config *pcm_config;
 	unsigned int sample_size;
 	uint32_t ctrl;

 	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S8:
 		sample_size = 0;
 		dma_width = JZ4740_DMA_WIDTH_8BIT;
 		break;
 	case SNDRV_PCM_FORMAT_S16:
 		sample_size = 1;
 		dma_width = JZ4740_DMA_WIDTH_16BIT;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK;
 		ctrl |= sample_size << JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET;
 		if (params_channels(params) == 1)
 			ctrl |= JZ_AIC_CTRL_MONO_TO_STEREO;
 		else
 			ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;

 		pcm_config = &i2s->pcm_config_playback;
 		pcm_config->dma_config.dst_width = dma_width;

 	} else {
 		ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK;
 		ctrl |= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET;

 		pcm_config = &i2s->pcm_config_capture;
 		pcm_config->dma_config.src_width = dma_width;
 	}

 	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);

 	snd_soc_dai_set_dma_data(dai, substream, pcm_config);

 	return 0;
 }

 static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
 	unsigned int freq, int dir)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	struct clk *parent;
 	int ret = 0;

 	switch (clk_id) {
 	case JZ4740_I2S_CLKSRC_EXT:
 		parent = clk_get(NULL, "ext");
 		clk_set_parent(i2s->clk_i2s, parent);
 		break;
 	case JZ4740_I2S_CLKSRC_PLL:
 		parent = clk_get(NULL, "pll half");
 		clk_set_parent(i2s->clk_i2s, parent);
 		ret = clk_set_rate(i2s->clk_i2s, freq);
 		break;
 	default:
 		return -EINVAL;
 	}
 	clk_put(parent);

 	return ret;
 }

 static int jz4740_i2s_suspend(struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t conf;

 	if (dai->active) {
 		conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 		conf &= ~JZ_AIC_CONF_ENABLE;
 		jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

 		clk_disable(i2s->clk_i2s);
 	}

 	clk_disable(i2s->clk_aic);

 	return 0;
 }

 static int jz4740_i2s_resume(struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t conf;

 	clk_enable(i2s->clk_aic);

 	if (dai->active) {
 		clk_enable(i2s->clk_i2s);

 		conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
 		conf |= JZ_AIC_CONF_ENABLE;
 		jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
 	}

 	return 0;
 }

 static void jz4740_i2c_init_pcm_config(struct jz4740_i2s *i2s)
 {
 	struct jz4740_dma_config *dma_config;

 	/* Playback */
 	dma_config = &i2s->pcm_config_playback.dma_config;
 	dma_config->src_width = JZ4740_DMA_WIDTH_32BIT,
 	dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
 	dma_config->request_type = JZ4740_DMA_TYPE_AIC_TRANSMIT;
 	dma_config->flags = JZ4740_DMA_SRC_AUTOINC;
 	dma_config->mode = JZ4740_DMA_MODE_SINGLE;
 	i2s->pcm_config_playback.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;

 	/* Capture */
 	dma_config = &i2s->pcm_config_capture.dma_config;
 	dma_config->dst_width = JZ4740_DMA_WIDTH_32BIT,
 	dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
 	dma_config->request_type = JZ4740_DMA_TYPE_AIC_RECEIVE;
 	dma_config->flags = JZ4740_DMA_DST_AUTOINC;
 	dma_config->mode = JZ4740_DMA_MODE_SINGLE;
 	i2s->pcm_config_capture.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;
 }

 static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t conf;

 	clk_enable(i2s->clk_aic);

 	jz4740_i2c_init_pcm_config(i2s);

 	conf = (7 << JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) |
 		(8 << JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) |
 		JZ_AIC_CONF_OVERFLOW_PLAY_LAST |
 		JZ_AIC_CONF_I2S |
 		JZ_AIC_CONF_INTERNAL_CODEC;

 	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
 	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

 	return 0;
 }

 static int jz4740_i2s_dai_remove(struct snd_soc_dai *dai)
 {
 	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	clk_disable(i2s->clk_aic);
 	return 0;
 }

 static struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
 	.startup = jz4740_i2s_startup,
 	.shutdown = jz4740_i2s_shutdown,
 	.trigger = jz4740_i2s_trigger,
 	.hw_params = jz4740_i2s_hw_params,
 	.set_fmt = jz4740_i2s_set_fmt,
 	.set_sysclk = jz4740_i2s_set_sysclk,
 };

 #define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
 		SNDRV_PCM_FMTBIT_S16_LE)

 static struct snd_soc_dai_driver jz4740_i2s_dai = {
 	.probe = jz4740_i2s_dai_probe,
 	.remove = jz4740_i2s_dai_remove,
 	.playback = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_48000,
 		.formats = JZ4740_I2S_FMTS,
 	},
 	.capture = {
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_48000,
 		.formats = JZ4740_I2S_FMTS,
 	},
 	.symmetric_rates = 1,
 	.ops = &jz4740_i2s_dai_ops,
 	.suspend = jz4740_i2s_suspend,
 	.resume = jz4740_i2s_resume,
 };

 static int __devinit jz4740_i2s_dev_probe(struct platform_device *pdev)
 {
 	struct jz4740_i2s *i2s;
 	int ret;

 	i2s = kzalloc(sizeof(*i2s), GFP_KERNEL);

 	if (!i2s)
 		return -ENOMEM;

 	i2s->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!i2s->mem) {
 		ret = -ENOENT;
 		goto err_free;
 	}

 	i2s->mem = request_mem_region(i2s->mem->start, resource_size(i2s->mem),
 				pdev->name);
 	if (!i2s->mem) {
 		ret = -EBUSY;
 		goto err_free;
 	}

 	i2s->base = ioremap_nocache(i2s->mem->start, resource_size(i2s->mem));
 	if (!i2s->base) {
 		ret = -EBUSY;
 		goto err_release_mem_region;
 	}

 	i2s->phys_base = i2s->mem->start;

 	i2s->clk_aic = clk_get(&pdev->dev, "aic");
 	if (IS_ERR(i2s->clk_aic)) {
 		ret = PTR_ERR(i2s->clk_aic);
 		goto err_iounmap;
 	}

 	i2s->clk_i2s = clk_get(&pdev->dev, "i2s");
 	if (IS_ERR(i2s->clk_i2s)) {
 		ret = PTR_ERR(i2s->clk_i2s);
 		goto err_clk_put_aic;
 	}

 	platform_set_drvdata(pdev, i2s);
 	ret = snd_soc_register_dai(&pdev->dev, &jz4740_i2s_dai);

 	if (ret) {
 		dev_err(&pdev->dev, "Failed to register DAI\n");
 		goto err_clk_put_i2s;
 	}

 	return 0;

 err_clk_put_i2s:
 	clk_put(i2s->clk_i2s);
 err_clk_put_aic:
 	clk_put(i2s->clk_aic);
 err_iounmap:
 	iounmap(i2s->base);
 err_release_mem_region:
 	release_mem_region(i2s->mem->start, resource_size(i2s->mem));
 err_free:
 	kfree(i2s);

 	return ret;
 }

 static int __devexit jz4740_i2s_dev_remove(struct platform_device *pdev)
 {
 	struct jz4740_i2s *i2s = platform_get_drvdata(pdev);

 	snd_soc_unregister_dai(&pdev->dev);

 	clk_put(i2s->clk_i2s);
 	clk_put(i2s->clk_aic);

 	iounmap(i2s->base);
 	release_mem_region(i2s->mem->start, resource_size(i2s->mem));

 	platform_set_drvdata(pdev, NULL);
 	kfree(i2s);

 	return 0;
 }

 static struct platform_driver jz4740_i2s_driver = {
 	.probe = jz4740_i2s_dev_probe,
 	.remove = __devexit_p(jz4740_i2s_dev_remove),
 	.driver = {
 		.name = "jz4740-i2s",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init jz4740_i2s_init(void)
 {
 	return platform_driver_register(&jz4740_i2s_driver);
 }
 module_init(jz4740_i2s_init);

 static void __exit jz4740_i2s_exit(void)
 {
 	platform_driver_unregister(&jz4740_i2s_driver);
 }
 module_exit(jz4740_i2s_exit);

 MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
 MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:jz4740-i2s");
	/*
	* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
	*
	* 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.
	*
	* 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.,
	* 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	*/

	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>

	#include <linux/clk.h>
	#include <linux/delay.h>

	#include <linux/dma-mapping.h>

	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/initval.h>

	#include "jz4740-i2s.h"
	#include "jz4740-pcm.h"

	#define JZ_REG_AIC_CONF 0x00
	#define JZ_REG_AIC_CTRL 0x04
	#define JZ_REG_AIC_I2S_FMT 0x10
	#define JZ_REG_AIC_FIFO_STATUS 0x14
	#define JZ_REG_AIC_I2S_STATUS 0x1c
	#define JZ_REG_AIC_CLK_DIV 0x30
	#define JZ_REG_AIC_FIFO 0x34

	#define JZ_AIC_CONF_FIFO_RX_THRESHOLD_MASK (0xf << 12)
	#define JZ_AIC_CONF_FIFO_TX_THRESHOLD_MASK (0xf << 8)
	#define JZ_AIC_CONF_OVERFLOW_PLAY_LAST BIT(6)
	#define JZ_AIC_CONF_INTERNAL_CODEC BIT(5)
	#define JZ_AIC_CONF_I2S BIT(4)
	#define JZ_AIC_CONF_RESET BIT(3)
	#define JZ_AIC_CONF_BIT_CLK_MASTER BIT(2)
	#define JZ_AIC_CONF_SYNC_CLK_MASTER BIT(1)
	#define JZ_AIC_CONF_ENABLE BIT(0)

	#define JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET 12
	#define JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET 8

	#define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK (0x7 << 19)
	#define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK (0x7 << 16)
	#define JZ_AIC_CTRL_ENABLE_RX_DMA BIT(15)
	#define JZ_AIC_CTRL_ENABLE_TX_DMA BIT(14)
	#define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11)
	#define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10)
	#define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9)
	#define JZ_AIC_CTRL_FLUSH BIT(8)
	#define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6)
	#define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5)
	#define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4)
	#define JZ_AIC_CTRL_ENABLE_TFS_INT BIT(3)
	#define JZ_AIC_CTRL_ENABLE_LOOPBACK BIT(2)
	#define JZ_AIC_CTRL_ENABLE_PLAYBACK BIT(1)
	#define JZ_AIC_CTRL_ENABLE_CAPTURE BIT(0)

	#define JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET 19
	#define JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET 16

	#define JZ_AIC_I2S_FMT_DISABLE_BIT_CLK BIT(12)
	#define JZ_AIC_I2S_FMT_ENABLE_SYS_CLK BIT(4)
	#define JZ_AIC_I2S_FMT_MSB BIT(0)

	#define JZ_AIC_I2S_STATUS_BUSY BIT(2)

	#define JZ_AIC_CLK_DIV_MASK 0xf

	struct jz4740_i2s {
	struct resource *mem;
	void __iomem *base;
	dma_addr_t phys_base;

	struct clk *clk_aic;
	struct clk *clk_i2s;

	struct jz4740_pcm_config pcm_config_playback;
	struct jz4740_pcm_config pcm_config_capture;
	};

	static inline uint32_t jz4740_i2s_read(const struct jz4740_i2s *i2s,
	unsigned int reg)
	{
	return readl(i2s->base + reg);
	}

	static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s,
	unsigned int reg, uint32_t value)
	{
	writel(value, i2s->base + reg);
	}

	static int jz4740_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t conf, ctrl;

	if (dai->active)
	return 0;

	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);
	ctrl \|= JZ_AIC_CTRL_FLUSH;
	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);

	clk_enable(i2s->clk_i2s);

	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
	conf \|= JZ_AIC_CONF_ENABLE;
	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

	return 0;
	}

	static void jz4740_i2s_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t conf;

	if (dai->active)
	return;

	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
	conf &= ~JZ_AIC_CONF_ENABLE;
	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

	clk_disable(i2s->clk_i2s);
	}

	static int jz4740_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	uint32_t ctrl;
	uint32_t mask;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	mask = JZ_AIC_CTRL_ENABLE_PLAYBACK \| JZ_AIC_CTRL_ENABLE_TX_DMA;
	else
	mask = JZ_AIC_CTRL_ENABLE_CAPTURE \| JZ_AIC_CTRL_ENABLE_RX_DMA;

	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	ctrl \|= mask;
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	ctrl &= ~mask;
	break;
	default:
	return -EINVAL;
	}

	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);

	return 0;
	}

	static int jz4740_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	uint32_t format = 0;
	uint32_t conf;

	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);

	conf &= ~(JZ_AIC_CONF_BIT_CLK_MASTER \| JZ_AIC_CONF_SYNC_CLK_MASTER);

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	conf \|= JZ_AIC_CONF_BIT_CLK_MASTER \| JZ_AIC_CONF_SYNC_CLK_MASTER;
	format \|= JZ_AIC_I2S_FMT_ENABLE_SYS_CLK;
	break;
	case SND_SOC_DAIFMT_CBM_CFS:
	conf \|= JZ_AIC_CONF_SYNC_CLK_MASTER;
	break;
	case SND_SOC_DAIFMT_CBS_CFM:
	conf \|= JZ_AIC_CONF_BIT_CLK_MASTER;
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_MSB:
	format \|= JZ_AIC_I2S_FMT_MSB;
	break;
	case SND_SOC_DAIFMT_I2S:
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	default:
	return -EINVAL;
	}

	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
	jz4740_i2s_write(i2s, JZ_REG_AIC_I2S_FMT, format);

	return 0;
	}

	static int jz4740_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params params, struct snd_soc_dai dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	enum jz4740_dma_width dma_width;
	struct jz4740_pcm_config *pcm_config;
	unsigned int sample_size;
	uint32_t ctrl;

	ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
	sample_size = 0;
	dma_width = JZ4740_DMA_WIDTH_8BIT;
	break;
	case SNDRV_PCM_FORMAT_S16:
	sample_size = 1;
	dma_width = JZ4740_DMA_WIDTH_16BIT;
	break;
	default:
	return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	ctrl &= ~JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_MASK;
	ctrl \|= sample_size << JZ_AIC_CTRL_OUTPUT_SAMPLE_SIZE_OFFSET;
	if (params_channels(params) == 1)
	ctrl \|= JZ_AIC_CTRL_MONO_TO_STEREO;
	else
	ctrl &= ~JZ_AIC_CTRL_MONO_TO_STEREO;

	pcm_config = &i2s->pcm_config_playback;
	pcm_config->dma_config.dst_width = dma_width;

	} else {
	ctrl &= ~JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_MASK;
	ctrl \|= sample_size << JZ_AIC_CTRL_INPUT_SAMPLE_SIZE_OFFSET;

	pcm_config = &i2s->pcm_config_capture;
	pcm_config->dma_config.src_width = dma_width;
	}

	jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl);

	snd_soc_dai_set_dma_data(dai, substream, pcm_config);

	return 0;
	}

	static int jz4740_i2s_set_sysclk(struct snd_soc_dai *dai, int clk_id,
	unsigned int freq, int dir)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	struct clk *parent;
	int ret = 0;

	switch (clk_id) {
	case JZ4740_I2S_CLKSRC_EXT:
	parent = clk_get(NULL, "ext");
	clk_set_parent(i2s->clk_i2s, parent);
	break;
	case JZ4740_I2S_CLKSRC_PLL:
	parent = clk_get(NULL, "pll half");
	clk_set_parent(i2s->clk_i2s, parent);
	ret = clk_set_rate(i2s->clk_i2s, freq);
	break;
	default:
	return -EINVAL;
	}
	clk_put(parent);

	return ret;
	}

	static int jz4740_i2s_suspend(struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t conf;

	if (dai->active) {
	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
	conf &= ~JZ_AIC_CONF_ENABLE;
	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

	clk_disable(i2s->clk_i2s);
	}

	clk_disable(i2s->clk_aic);

	return 0;
	}

	static int jz4740_i2s_resume(struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t conf;

	clk_enable(i2s->clk_aic);

	if (dai->active) {
	clk_enable(i2s->clk_i2s);

	conf = jz4740_i2s_read(i2s, JZ_REG_AIC_CONF);
	conf \|= JZ_AIC_CONF_ENABLE;
	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);
	}

	return 0;
	}

	static void jz4740_i2c_init_pcm_config(struct jz4740_i2s *i2s)
	{
	struct jz4740_dma_config *dma_config;

	/* Playback */
	dma_config = &i2s->pcm_config_playback.dma_config;
	dma_config->src_width = JZ4740_DMA_WIDTH_32BIT,
	dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
	dma_config->request_type = JZ4740_DMA_TYPE_AIC_TRANSMIT;
	dma_config->flags = JZ4740_DMA_SRC_AUTOINC;
	dma_config->mode = JZ4740_DMA_MODE_SINGLE;
	i2s->pcm_config_playback.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;

	/* Capture */
	dma_config = &i2s->pcm_config_capture.dma_config;
	dma_config->dst_width = JZ4740_DMA_WIDTH_32BIT,
	dma_config->transfer_size = JZ4740_DMA_TRANSFER_SIZE_16BYTE;
	dma_config->request_type = JZ4740_DMA_TYPE_AIC_RECEIVE;
	dma_config->flags = JZ4740_DMA_DST_AUTOINC;
	dma_config->mode = JZ4740_DMA_MODE_SINGLE;
	i2s->pcm_config_capture.fifo_addr = i2s->phys_base + JZ_REG_AIC_FIFO;
	}

	static int jz4740_i2s_dai_probe(struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t conf;

	clk_enable(i2s->clk_aic);

	jz4740_i2c_init_pcm_config(i2s);

	conf = (7 << JZ_AIC_CONF_FIFO_RX_THRESHOLD_OFFSET) \|
	(8 << JZ_AIC_CONF_FIFO_TX_THRESHOLD_OFFSET) \|
	JZ_AIC_CONF_OVERFLOW_PLAY_LAST \|
	JZ_AIC_CONF_I2S \|
	JZ_AIC_CONF_INTERNAL_CODEC;

	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, JZ_AIC_CONF_RESET);
	jz4740_i2s_write(i2s, JZ_REG_AIC_CONF, conf);

	return 0;
	}

	static int jz4740_i2s_dai_remove(struct snd_soc_dai *dai)
	{
	struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	clk_disable(i2s->clk_aic);
	return 0;
	}

	static struct snd_soc_dai_ops jz4740_i2s_dai_ops = {
	.startup = jz4740_i2s_startup,
	.shutdown = jz4740_i2s_shutdown,
	.trigger = jz4740_i2s_trigger,
	.hw_params = jz4740_i2s_hw_params,
	.set_fmt = jz4740_i2s_set_fmt,
	.set_sysclk = jz4740_i2s_set_sysclk,
	};

	#define JZ4740_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 \| \
	SNDRV_PCM_FMTBIT_S16_LE)

	static struct snd_soc_dai_driver jz4740_i2s_dai = {
	.probe = jz4740_i2s_dai_probe,
	.remove = jz4740_i2s_dai_remove,
	.playback = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = JZ4740_I2S_FMTS,
	},
	.capture = {
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = JZ4740_I2S_FMTS,
	},
	.symmetric_rates = 1,
	.ops = &jz4740_i2s_dai_ops,
	.suspend = jz4740_i2s_suspend,
	.resume = jz4740_i2s_resume,
	};

	static int __devinit jz4740_i2s_dev_probe(struct platform_device *pdev)
	{
	struct jz4740_i2s *i2s;
	int ret;

	i2s = kzalloc(sizeof(*i2s), GFP_KERNEL);

	if (!i2s)
	return -ENOMEM;

	i2s->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!i2s->mem) {
	ret = -ENOENT;
	goto err_free;
	}

	i2s->mem = request_mem_region(i2s->mem->start, resource_size(i2s->mem),
	pdev->name);
	if (!i2s->mem) {
	ret = -EBUSY;
	goto err_free;
	}

	i2s->base = ioremap_nocache(i2s->mem->start, resource_size(i2s->mem));
	if (!i2s->base) {
	ret = -EBUSY;
	goto err_release_mem_region;
	}

	i2s->phys_base = i2s->mem->start;

	i2s->clk_aic = clk_get(&pdev->dev, "aic");
	if (IS_ERR(i2s->clk_aic)) {
	ret = PTR_ERR(i2s->clk_aic);
	goto err_iounmap;
	}

	i2s->clk_i2s = clk_get(&pdev->dev, "i2s");
	if (IS_ERR(i2s->clk_i2s)) {
	ret = PTR_ERR(i2s->clk_i2s);
	goto err_clk_put_aic;
	}

	platform_set_drvdata(pdev, i2s);
	ret = snd_soc_register_dai(&pdev->dev, &jz4740_i2s_dai);

	if (ret) {
	dev_err(&pdev->dev, "Failed to register DAI\n");
	goto err_clk_put_i2s;
	}

	return 0;

	err_clk_put_i2s:
	clk_put(i2s->clk_i2s);
	err_clk_put_aic:
	clk_put(i2s->clk_aic);
	err_iounmap:
	iounmap(i2s->base);
	err_release_mem_region:
	release_mem_region(i2s->mem->start, resource_size(i2s->mem));
	err_free:
	kfree(i2s);

	return ret;
	}

	static int __devexit jz4740_i2s_dev_remove(struct platform_device *pdev)
	{
	struct jz4740_i2s *i2s = platform_get_drvdata(pdev);

	snd_soc_unregister_dai(&pdev->dev);

	clk_put(i2s->clk_i2s);
	clk_put(i2s->clk_aic);

	iounmap(i2s->base);
	release_mem_region(i2s->mem->start, resource_size(i2s->mem));

	platform_set_drvdata(pdev, NULL);
	kfree(i2s);

	return 0;
	}

	static struct platform_driver jz4740_i2s_driver = {
	.probe = jz4740_i2s_dev_probe,
	.remove = __devexit_p(jz4740_i2s_dev_remove),
	.driver = {
	.name = "jz4740-i2s",
	.owner = THIS_MODULE,
	},
	};

	static int __init jz4740_i2s_init(void)
	{
	return platform_driver_register(&jz4740_i2s_driver);
	}
	module_init(jz4740_i2s_init);

	static void __exit jz4740_i2s_exit(void)
	{
	platform_driver_unregister(&jz4740_i2s_driver);
	}
	module_exit(jz4740_i2s_exit);

	MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
	MODULE_DESCRIPTION("Ingenic JZ4740 SoC I2S driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:jz4740-i2s");