sound/soc/rockchip/rockchip_i2s.c - kernel/msm-4.9 - Gitiles

 /* sound/soc/rockchip/rockchip_i2s.c
  *
  * ALSA SoC Audio Layer - Rockchip I2S Controller driver
  *
  * Copyright (c) 2014 Rockchip Electronics Co. Ltd.
  * Author: Jianqun <jay.xu@rock-chips.com>
  *
  * 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/delay.h>
 #include <linux/of_gpio.h>
 #include <linux/clk.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <sound/pcm_params.h>
 #include <sound/dmaengine_pcm.h>

 #include "rockchip_i2s.h"

 #define DRV_NAME "rockchip-i2s"

 struct rk_i2s_dev {
 	struct device *dev;

 	struct clk *hclk;
 	struct clk *mclk;

 	struct snd_dmaengine_dai_dma_data capture_dma_data;
 	struct snd_dmaengine_dai_dma_data playback_dma_data;

 	struct regmap *regmap;

 /*
  * Used to indicate the tx/rx status.
  * I2S controller hopes to start the tx and rx together,
  * also to stop them when they are both try to stop.
 */
 	bool tx_start;
 	bool rx_start;
 };

 static int i2s_runtime_suspend(struct device *dev)
 {
 	struct rk_i2s_dev *i2s = dev_get_drvdata(dev);

 	clk_disable_unprepare(i2s->mclk);

 	return 0;
 }

 static int i2s_runtime_resume(struct device *dev)
 {
 	struct rk_i2s_dev *i2s = dev_get_drvdata(dev);
 	int ret;

 	ret = clk_prepare_enable(i2s->mclk);
 	if (ret) {
 		dev_err(i2s->dev, "clock enable failed %d\n", ret);
 		return ret;
 	}

 	return 0;
 }

 static inline struct rk_i2s_dev *to_info(struct snd_soc_dai *dai)
 {
 	return snd_soc_dai_get_drvdata(dai);
 }

 static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 {
 	unsigned int val = 0;
 	int retry = 10;

 	if (on) {
 		regmap_update_bits(i2s->regmap, I2S_DMACR,
 				   I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_ENABLE);

 		regmap_update_bits(i2s->regmap, I2S_XFER,
 				   I2S_XFER_TXS_START | I2S_XFER_RXS_START,
 				   I2S_XFER_TXS_START | I2S_XFER_RXS_START);

 		i2s->tx_start = true;
 	} else {
 		i2s->tx_start = false;

 		regmap_update_bits(i2s->regmap, I2S_DMACR,
 				   I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_DISABLE);

 		if (!i2s->rx_start) {
 			regmap_update_bits(i2s->regmap, I2S_XFER,
 					   I2S_XFER_TXS_START |
 					   I2S_XFER_RXS_START,
 					   I2S_XFER_TXS_STOP |
 					   I2S_XFER_RXS_STOP);

 			regmap_update_bits(i2s->regmap, I2S_CLR,
 					   I2S_CLR_TXC | I2S_CLR_RXC,
 					   I2S_CLR_TXC | I2S_CLR_RXC);

 			regmap_read(i2s->regmap, I2S_CLR, &val);

 			/* Should wait for clear operation to finish */
 			while (val) {
 				regmap_read(i2s->regmap, I2S_CLR, &val);
 				retry--;
 				if (!retry) {
 					dev_warn(i2s->dev, "fail to clear\n");
 					break;
 				}
 			}
 		}
 	}
 }

 static void rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
 {
 	unsigned int val = 0;
 	int retry = 10;

 	if (on) {
 		regmap_update_bits(i2s->regmap, I2S_DMACR,
 				   I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_ENABLE);

 		regmap_update_bits(i2s->regmap, I2S_XFER,
 				   I2S_XFER_TXS_START | I2S_XFER_RXS_START,
 				   I2S_XFER_TXS_START | I2S_XFER_RXS_START);

 		i2s->rx_start = true;
 	} else {
 		i2s->rx_start = false;

 		regmap_update_bits(i2s->regmap, I2S_DMACR,
 				   I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_DISABLE);

 		if (!i2s->tx_start) {
 			regmap_update_bits(i2s->regmap, I2S_XFER,
 					   I2S_XFER_TXS_START |
 					   I2S_XFER_RXS_START,
 					   I2S_XFER_TXS_STOP |
 					   I2S_XFER_RXS_STOP);

 			regmap_update_bits(i2s->regmap, I2S_CLR,
 					   I2S_CLR_TXC | I2S_CLR_RXC,
 					   I2S_CLR_TXC | I2S_CLR_RXC);

 			regmap_read(i2s->regmap, I2S_CLR, &val);

 			/* Should wait for clear operation to finish */
 			while (val) {
 				regmap_read(i2s->regmap, I2S_CLR, &val);
 				retry--;
 				if (!retry)
 					dev_warn(i2s->dev, "fail to clear\n");
 			}
 		}
 	}
 }

 static int rockchip_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
 				unsigned int fmt)
 {
 	struct rk_i2s_dev *i2s = to_info(cpu_dai);
 	unsigned int mask = 0, val = 0;

 	mask = I2S_CKR_MSS_MASK;
 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		/* Set source clock in Master mode */
 		val = I2S_CKR_MSS_MASTER;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		val = I2S_CKR_MSS_SLAVE;
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(i2s->regmap, I2S_CKR, mask, val);

 	mask = I2S_TXCR_IBM_MASK;
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_RIGHT_J:
 		val = I2S_TXCR_IBM_RSJM;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		val = I2S_TXCR_IBM_LSJM;
 		break;
 	case SND_SOC_DAIFMT_I2S:
 		val = I2S_TXCR_IBM_NORMAL;
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(i2s->regmap, I2S_TXCR, mask, val);

 	mask = I2S_RXCR_IBM_MASK;
 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_RIGHT_J:
 		val = I2S_RXCR_IBM_RSJM;
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		val = I2S_RXCR_IBM_LSJM;
 		break;
 	case SND_SOC_DAIFMT_I2S:
 		val = I2S_RXCR_IBM_NORMAL;
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(i2s->regmap, I2S_RXCR, mask, val);

 	return 0;
 }

 static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *params,
 				  struct snd_soc_dai *dai)
 {
 	struct rk_i2s_dev *i2s = to_info(dai);
 	unsigned int val = 0;

 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S8:
 		val |= I2S_TXCR_VDW(8);
 		break;
 	case SNDRV_PCM_FORMAT_S16_LE:
 		val |= I2S_TXCR_VDW(16);
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		val |= I2S_TXCR_VDW(20);
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		val |= I2S_TXCR_VDW(24);
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(i2s->regmap, I2S_TXCR, I2S_TXCR_VDW_MASK, val);
 	regmap_update_bits(i2s->regmap, I2S_RXCR, I2S_RXCR_VDW_MASK, val);

 	return 0;
 }

 static int rockchip_i2s_trigger(struct snd_pcm_substream *substream,
 				int cmd, struct snd_soc_dai *dai)
 {
 	struct rk_i2s_dev *i2s = to_info(dai);
 	int ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			rockchip_snd_rxctrl(i2s, 1);
 		else
 			rockchip_snd_txctrl(i2s, 1);
 		break;
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			rockchip_snd_rxctrl(i2s, 0);
 		else
 			rockchip_snd_txctrl(i2s, 0);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static int rockchip_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
 				   unsigned int freq, int dir)
 {
 	struct rk_i2s_dev *i2s = to_info(cpu_dai);
 	int ret;

 	ret = clk_set_rate(i2s->mclk, freq);
 	if (ret)
 		dev_err(i2s->dev, "Fail to set mclk %d\n", ret);

 	return ret;
 }

 static int rockchip_i2s_dai_probe(struct snd_soc_dai *dai)
 {
 	struct rk_i2s_dev *i2s = snd_soc_dai_get_drvdata(dai);

 	dai->capture_dma_data = &i2s->capture_dma_data;
 	dai->playback_dma_data = &i2s->playback_dma_data;

 	return 0;
 }

 static const struct snd_soc_dai_ops rockchip_i2s_dai_ops = {
 	.hw_params = rockchip_i2s_hw_params,
 	.set_sysclk = rockchip_i2s_set_sysclk,
 	.set_fmt = rockchip_i2s_set_fmt,
 	.trigger = rockchip_i2s_trigger,
 };

 static struct snd_soc_dai_driver rockchip_i2s_dai = {
 	.probe = rockchip_i2s_dai_probe,
 	.playback = {
 		.stream_name = "Playback",
 		.channels_min = 2,
 		.channels_max = 8,
 		.rates = SNDRV_PCM_RATE_8000_192000,
 		.formats = (SNDRV_PCM_FMTBIT_S8 |
 			    SNDRV_PCM_FMTBIT_S16_LE |
 			    SNDRV_PCM_FMTBIT_S20_3LE |
 			    SNDRV_PCM_FMTBIT_S24_LE),
 	},
 	.capture = {
 		.stream_name = "Capture",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_192000,
 		.formats = (SNDRV_PCM_FMTBIT_S8 |
 			    SNDRV_PCM_FMTBIT_S16_LE |
 			    SNDRV_PCM_FMTBIT_S20_3LE |
 			    SNDRV_PCM_FMTBIT_S24_LE),
 	},
 	.ops = &rockchip_i2s_dai_ops,
 };

 static const struct snd_soc_component_driver rockchip_i2s_component = {
 	.name = DRV_NAME,
 };

 static bool rockchip_i2s_wr_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case I2S_TXCR:
 	case I2S_RXCR:
 	case I2S_CKR:
 	case I2S_DMACR:
 	case I2S_INTCR:
 	case I2S_XFER:
 	case I2S_CLR:
 	case I2S_TXDR:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool rockchip_i2s_rd_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case I2S_TXCR:
 	case I2S_RXCR:
 	case I2S_CKR:
 	case I2S_DMACR:
 	case I2S_INTCR:
 	case I2S_XFER:
 	case I2S_CLR:
 	case I2S_RXDR:
 	case I2S_FIFOLR:
 	case I2S_INTSR:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool rockchip_i2s_volatile_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	case I2S_INTSR:
 	case I2S_CLR:
 		return true;
 	default:
 		return false;
 	}
 }

 static bool rockchip_i2s_precious_reg(struct device *dev, unsigned int reg)
 {
 	switch (reg) {
 	default:
 		return false;
 	}
 }

 static const struct regmap_config rockchip_i2s_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
 	.max_register = I2S_RXDR,
 	.writeable_reg = rockchip_i2s_wr_reg,
 	.readable_reg = rockchip_i2s_rd_reg,
 	.volatile_reg = rockchip_i2s_volatile_reg,
 	.precious_reg = rockchip_i2s_precious_reg,
 	.cache_type = REGCACHE_FLAT,
 };

 static int rockchip_i2s_probe(struct platform_device *pdev)
 {
 	struct rk_i2s_dev *i2s;
 	struct resource *res;
 	void __iomem *regs;
 	int ret;

 	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
 	if (!i2s) {
 		dev_err(&pdev->dev, "Can't allocate rk_i2s_dev\n");
 		return -ENOMEM;
 	}

 	/* try to prepare related clocks */
 	i2s->hclk = devm_clk_get(&pdev->dev, "i2s_hclk");
 	if (IS_ERR(i2s->hclk)) {
 		dev_err(&pdev->dev, "Can't retrieve i2s bus clock\n");
 		return PTR_ERR(i2s->hclk);
 	}
 	ret = clk_prepare_enable(i2s->hclk);
 	if (ret) {
 		dev_err(i2s->dev, "hclock enable failed %d\n", ret);
 		return ret;
 	}

 	i2s->mclk = devm_clk_get(&pdev->dev, "i2s_clk");
 	if (IS_ERR(i2s->mclk)) {
 		dev_err(&pdev->dev, "Can't retrieve i2s master clock\n");
 		return PTR_ERR(i2s->mclk);
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);

 	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
 					    &rockchip_i2s_regmap_config);
 	if (IS_ERR(i2s->regmap)) {
 		dev_err(&pdev->dev,
 			"Failed to initialise managed register map\n");
 		return PTR_ERR(i2s->regmap);
 	}

 	i2s->playback_dma_data.addr = res->start + I2S_TXDR;
 	i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	i2s->playback_dma_data.maxburst = 16;

 	i2s->capture_dma_data.addr = res->start + I2S_RXDR;
 	i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	i2s->capture_dma_data.maxburst = 16;

 	i2s->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, i2s);

 	pm_runtime_enable(&pdev->dev);
 	if (!pm_runtime_enabled(&pdev->dev)) {
 		ret = i2s_runtime_resume(&pdev->dev);
 		if (ret)
 			goto err_pm_disable;
 	}

 	ret = devm_snd_soc_register_component(&pdev->dev,
 					      &rockchip_i2s_component,
 					      &rockchip_i2s_dai, 1);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not register DAI\n");
 		goto err_suspend;
 	}

 	ret = snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not register PCM\n");
 		goto err_pcm_register;
 	}

 	return 0;

 err_pcm_register:
 	snd_dmaengine_pcm_unregister(&pdev->dev);
 err_suspend:
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		i2s_runtime_suspend(&pdev->dev);
 err_pm_disable:
 	pm_runtime_disable(&pdev->dev);

 	return ret;
 }

 static int rockchip_i2s_remove(struct platform_device *pdev)
 {
 	struct rk_i2s_dev *i2s = dev_get_drvdata(&pdev->dev);

 	pm_runtime_disable(&pdev->dev);
 	if (!pm_runtime_status_suspended(&pdev->dev))
 		i2s_runtime_suspend(&pdev->dev);

 	clk_disable_unprepare(i2s->mclk);
 	clk_disable_unprepare(i2s->hclk);
 	snd_dmaengine_pcm_unregister(&pdev->dev);
 	snd_soc_unregister_component(&pdev->dev);

 	return 0;
 }

 static const struct of_device_id rockchip_i2s_match[] = {
 	{ .compatible = "rockchip,rk3066-i2s", },
 	{},
 };

 static const struct dev_pm_ops rockchip_i2s_pm_ops = {
 	SET_RUNTIME_PM_OPS(i2s_runtime_suspend, i2s_runtime_resume,
 			   NULL)
 };

 static struct platform_driver rockchip_i2s_driver = {
 	.probe = rockchip_i2s_probe,
 	.remove = rockchip_i2s_remove,
 	.driver = {
 		.name = DRV_NAME,
 		.owner = THIS_MODULE,
 		.of_match_table = of_match_ptr(rockchip_i2s_match),
 		.pm = &rockchip_i2s_pm_ops,
 	},
 };
 module_platform_driver(rockchip_i2s_driver);

 MODULE_DESCRIPTION("ROCKCHIP IIS ASoC Interface");
 MODULE_AUTHOR("jianqun <jay.xu@rock-chips.com>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:" DRV_NAME);
 MODULE_DEVICE_TABLE(of, rockchip_i2s_match);
	/* sound/soc/rockchip/rockchip_i2s.c
	*
	* ALSA SoC Audio Layer - Rockchip I2S Controller driver
	*
	* Copyright (c) 2014 Rockchip Electronics Co. Ltd.
	* Author: Jianqun <jay.xu@rock-chips.com>
	*
	* 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/delay.h>
	#include <linux/of_gpio.h>
	#include <linux/clk.h>
	#include <linux/pm_runtime.h>
	#include <linux/regmap.h>
	#include <sound/pcm_params.h>
	#include <sound/dmaengine_pcm.h>

	#include "rockchip_i2s.h"

	#define DRV_NAME "rockchip-i2s"

	struct rk_i2s_dev {
	struct device *dev;

	struct clk *hclk;
	struct clk *mclk;

	struct snd_dmaengine_dai_dma_data capture_dma_data;
	struct snd_dmaengine_dai_dma_data playback_dma_data;

	struct regmap *regmap;

	/*
	* Used to indicate the tx/rx status.
	* I2S controller hopes to start the tx and rx together,
	* also to stop them when they are both try to stop.
	*/
	bool tx_start;
	bool rx_start;
	};

	static int i2s_runtime_suspend(struct device *dev)
	{
	struct rk_i2s_dev *i2s = dev_get_drvdata(dev);

	clk_disable_unprepare(i2s->mclk);

	return 0;
	}

	static int i2s_runtime_resume(struct device *dev)
	{
	struct rk_i2s_dev *i2s = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(i2s->mclk);
	if (ret) {
	dev_err(i2s->dev, "clock enable failed %d\n", ret);
	return ret;
	}

	return 0;
	}

	static inline struct rk_i2s_dev to_info(struct snd_soc_dai dai)
	{
	return snd_soc_dai_get_drvdata(dai);
	}

	static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
	{
	unsigned int val = 0;
	int retry = 10;

	if (on) {
	regmap_update_bits(i2s->regmap, I2S_DMACR,
	I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_ENABLE);

	regmap_update_bits(i2s->regmap, I2S_XFER,
	I2S_XFER_TXS_START \| I2S_XFER_RXS_START,
	I2S_XFER_TXS_START \| I2S_XFER_RXS_START);

	i2s->tx_start = true;
	} else {
	i2s->tx_start = false;

	regmap_update_bits(i2s->regmap, I2S_DMACR,
	I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_DISABLE);

	if (!i2s->rx_start) {
	regmap_update_bits(i2s->regmap, I2S_XFER,
	I2S_XFER_TXS_START \|
	I2S_XFER_RXS_START,
	I2S_XFER_TXS_STOP \|
	I2S_XFER_RXS_STOP);

	regmap_update_bits(i2s->regmap, I2S_CLR,
	I2S_CLR_TXC \| I2S_CLR_RXC,
	I2S_CLR_TXC \| I2S_CLR_RXC);

	regmap_read(i2s->regmap, I2S_CLR, &val);

	/* Should wait for clear operation to finish */
	while (val) {
	regmap_read(i2s->regmap, I2S_CLR, &val);
	retry--;
	if (!retry) {
	dev_warn(i2s->dev, "fail to clear\n");
	break;
	}
	}
	}
	}
	}

	static void rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
	{
	unsigned int val = 0;
	int retry = 10;

	if (on) {
	regmap_update_bits(i2s->regmap, I2S_DMACR,
	I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_ENABLE);

	regmap_update_bits(i2s->regmap, I2S_XFER,
	I2S_XFER_TXS_START \| I2S_XFER_RXS_START,
	I2S_XFER_TXS_START \| I2S_XFER_RXS_START);

	i2s->rx_start = true;
	} else {
	i2s->rx_start = false;

	regmap_update_bits(i2s->regmap, I2S_DMACR,
	I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_DISABLE);

	if (!i2s->tx_start) {
	regmap_update_bits(i2s->regmap, I2S_XFER,
	I2S_XFER_TXS_START \|
	I2S_XFER_RXS_START,
	I2S_XFER_TXS_STOP \|
	I2S_XFER_RXS_STOP);

	regmap_update_bits(i2s->regmap, I2S_CLR,
	I2S_CLR_TXC \| I2S_CLR_RXC,
	I2S_CLR_TXC \| I2S_CLR_RXC);

	regmap_read(i2s->regmap, I2S_CLR, &val);

	/* Should wait for clear operation to finish */
	while (val) {
	regmap_read(i2s->regmap, I2S_CLR, &val);
	retry--;
	if (!retry)
	dev_warn(i2s->dev, "fail to clear\n");
	}
	}
	}
	}

	static int rockchip_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
	unsigned int fmt)
	{
	struct rk_i2s_dev *i2s = to_info(cpu_dai);
	unsigned int mask = 0, val = 0;

	mask = I2S_CKR_MSS_MASK;
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	/* Set source clock in Master mode */
	val = I2S_CKR_MSS_MASTER;
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	val = I2S_CKR_MSS_SLAVE;
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, I2S_CKR, mask, val);

	mask = I2S_TXCR_IBM_MASK;
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
	val = I2S_TXCR_IBM_RSJM;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	val = I2S_TXCR_IBM_LSJM;
	break;
	case SND_SOC_DAIFMT_I2S:
	val = I2S_TXCR_IBM_NORMAL;
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, I2S_TXCR, mask, val);

	mask = I2S_RXCR_IBM_MASK;
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
	val = I2S_RXCR_IBM_RSJM;
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	val = I2S_RXCR_IBM_LSJM;
	break;
	case SND_SOC_DAIFMT_I2S:
	val = I2S_RXCR_IBM_NORMAL;
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, I2S_RXCR, mask, val);

	return 0;
	}

	static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct rk_i2s_dev *i2s = to_info(dai);
	unsigned int val = 0;

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
	val \|= I2S_TXCR_VDW(8);
	break;
	case SNDRV_PCM_FORMAT_S16_LE:
	val \|= I2S_TXCR_VDW(16);
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	val \|= I2S_TXCR_VDW(20);
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	val \|= I2S_TXCR_VDW(24);
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, I2S_TXCR, I2S_TXCR_VDW_MASK, val);
	regmap_update_bits(i2s->regmap, I2S_RXCR, I2S_RXCR_VDW_MASK, val);

	return 0;
	}

	static int rockchip_i2s_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct rk_i2s_dev *i2s = to_info(dai);
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	rockchip_snd_rxctrl(i2s, 1);
	else
	rockchip_snd_txctrl(i2s, 1);
	break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	rockchip_snd_rxctrl(i2s, 0);
	else
	rockchip_snd_txctrl(i2s, 0);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static int rockchip_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
	unsigned int freq, int dir)
	{
	struct rk_i2s_dev *i2s = to_info(cpu_dai);
	int ret;

	ret = clk_set_rate(i2s->mclk, freq);
	if (ret)
	dev_err(i2s->dev, "Fail to set mclk %d\n", ret);

	return ret;
	}

	static int rockchip_i2s_dai_probe(struct snd_soc_dai *dai)
	{
	struct rk_i2s_dev *i2s = snd_soc_dai_get_drvdata(dai);

	dai->capture_dma_data = &i2s->capture_dma_data;
	dai->playback_dma_data = &i2s->playback_dma_data;

	return 0;
	}

	static const struct snd_soc_dai_ops rockchip_i2s_dai_ops = {
	.hw_params = rockchip_i2s_hw_params,
	.set_sysclk = rockchip_i2s_set_sysclk,
	.set_fmt = rockchip_i2s_set_fmt,
	.trigger = rockchip_i2s_trigger,
	};

	static struct snd_soc_dai_driver rockchip_i2s_dai = {
	.probe = rockchip_i2s_dai_probe,
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2,
	.channels_max = 8,
	.rates = SNDRV_PCM_RATE_8000_192000,
	.formats = (SNDRV_PCM_FMTBIT_S8 \|
	SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S20_3LE \|
	SNDRV_PCM_FMTBIT_S24_LE),
	},
	.capture = {
	.stream_name = "Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_192000,
	.formats = (SNDRV_PCM_FMTBIT_S8 \|
	SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S20_3LE \|
	SNDRV_PCM_FMTBIT_S24_LE),
	},
	.ops = &rockchip_i2s_dai_ops,
	};

	static const struct snd_soc_component_driver rockchip_i2s_component = {
	.name = DRV_NAME,
	};

	static bool rockchip_i2s_wr_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case I2S_TXCR:
	case I2S_RXCR:
	case I2S_CKR:
	case I2S_DMACR:
	case I2S_INTCR:
	case I2S_XFER:
	case I2S_CLR:
	case I2S_TXDR:
	return true;
	default:
	return false;
	}
	}

	static bool rockchip_i2s_rd_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case I2S_TXCR:
	case I2S_RXCR:
	case I2S_CKR:
	case I2S_DMACR:
	case I2S_INTCR:
	case I2S_XFER:
	case I2S_CLR:
	case I2S_RXDR:
	case I2S_FIFOLR:
	case I2S_INTSR:
	return true;
	default:
	return false;
	}
	}

	static bool rockchip_i2s_volatile_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	case I2S_INTSR:
	case I2S_CLR:
	return true;
	default:
	return false;
	}
	}

	static bool rockchip_i2s_precious_reg(struct device *dev, unsigned int reg)
	{
	switch (reg) {
	default:
	return false;
	}
	}

	static const struct regmap_config rockchip_i2s_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = I2S_RXDR,
	.writeable_reg = rockchip_i2s_wr_reg,
	.readable_reg = rockchip_i2s_rd_reg,
	.volatile_reg = rockchip_i2s_volatile_reg,
	.precious_reg = rockchip_i2s_precious_reg,
	.cache_type = REGCACHE_FLAT,
	};

	static int rockchip_i2s_probe(struct platform_device *pdev)
	{
	struct rk_i2s_dev *i2s;
	struct resource *res;
	void __iomem *regs;
	int ret;

	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
	if (!i2s) {
	dev_err(&pdev->dev, "Can't allocate rk_i2s_dev\n");
	return -ENOMEM;
	}

	/* try to prepare related clocks */
	i2s->hclk = devm_clk_get(&pdev->dev, "i2s_hclk");
	if (IS_ERR(i2s->hclk)) {
	dev_err(&pdev->dev, "Can't retrieve i2s bus clock\n");
	return PTR_ERR(i2s->hclk);
	}
	ret = clk_prepare_enable(i2s->hclk);
	if (ret) {
	dev_err(i2s->dev, "hclock enable failed %d\n", ret);
	return ret;
	}

	i2s->mclk = devm_clk_get(&pdev->dev, "i2s_clk");
	if (IS_ERR(i2s->mclk)) {
	dev_err(&pdev->dev, "Can't retrieve i2s master clock\n");
	return PTR_ERR(i2s->mclk);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(regs))
	return PTR_ERR(regs);

	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
	&rockchip_i2s_regmap_config);
	if (IS_ERR(i2s->regmap)) {
	dev_err(&pdev->dev,
	"Failed to initialise managed register map\n");
	return PTR_ERR(i2s->regmap);
	}

	i2s->playback_dma_data.addr = res->start + I2S_TXDR;
	i2s->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	i2s->playback_dma_data.maxburst = 16;

	i2s->capture_dma_data.addr = res->start + I2S_RXDR;
	i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	i2s->capture_dma_data.maxburst = 16;

	i2s->dev = &pdev->dev;
	dev_set_drvdata(&pdev->dev, i2s);

	pm_runtime_enable(&pdev->dev);
	if (!pm_runtime_enabled(&pdev->dev)) {
	ret = i2s_runtime_resume(&pdev->dev);
	if (ret)
	goto err_pm_disable;
	}

	ret = devm_snd_soc_register_component(&pdev->dev,
	&rockchip_i2s_component,
	&rockchip_i2s_dai, 1);
	if (ret) {
	dev_err(&pdev->dev, "Could not register DAI\n");
	goto err_suspend;
	}

	ret = snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
	if (ret) {
	dev_err(&pdev->dev, "Could not register PCM\n");
	goto err_pcm_register;
	}

	return 0;

	err_pcm_register:
	snd_dmaengine_pcm_unregister(&pdev->dev);
	err_suspend:
	if (!pm_runtime_status_suspended(&pdev->dev))
	i2s_runtime_suspend(&pdev->dev);
	err_pm_disable:
	pm_runtime_disable(&pdev->dev);

	return ret;
	}

	static int rockchip_i2s_remove(struct platform_device *pdev)
	{
	struct rk_i2s_dev *i2s = dev_get_drvdata(&pdev->dev);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev))
	i2s_runtime_suspend(&pdev->dev);

	clk_disable_unprepare(i2s->mclk);
	clk_disable_unprepare(i2s->hclk);
	snd_dmaengine_pcm_unregister(&pdev->dev);
	snd_soc_unregister_component(&pdev->dev);

	return 0;
	}

	static const struct of_device_id rockchip_i2s_match[] = {
	{ .compatible = "rockchip,rk3066-i2s", },
	{},
	};

	static const struct dev_pm_ops rockchip_i2s_pm_ops = {
	SET_RUNTIME_PM_OPS(i2s_runtime_suspend, i2s_runtime_resume,
	NULL)
	};

	static struct platform_driver rockchip_i2s_driver = {
	.probe = rockchip_i2s_probe,
	.remove = rockchip_i2s_remove,
	.driver = {
	.name = DRV_NAME,
	.owner = THIS_MODULE,
	.of_match_table = of_match_ptr(rockchip_i2s_match),
	.pm = &rockchip_i2s_pm_ops,
	},
	};
	module_platform_driver(rockchip_i2s_driver);

	MODULE_DESCRIPTION("ROCKCHIP IIS ASoC Interface");
	MODULE_AUTHOR("jianqun <jay.xu@rock-chips.com>");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:" DRV_NAME);
	MODULE_DEVICE_TABLE(of, rockchip_i2s_match);