sound/soc/fsl/fsl_sai.c - kernel/lockdown - Git at Google

 /*
  * Freescale ALSA SoC Digital Audio Interface (SAI) driver.
  *
  * Copyright 2012-2013 Freescale Semiconductor, Inc.
  *
  * 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/clk.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>

 #include "fsl_sai.h"

 static inline u32 sai_readl(struct fsl_sai *sai,
 		const void __iomem *addr)
 {
 	u32 val;

 	val = __raw_readl(addr);

 	if (likely(sai->big_endian_regs))
 		val = be32_to_cpu(val);
 	else
 		val = le32_to_cpu(val);
 	rmb();

 	return val;
 }

 static inline void sai_writel(struct fsl_sai *sai,
 		u32 val, void __iomem *addr)
 {
 	wmb();
 	if (likely(sai->big_endian_regs))
 		val = cpu_to_be32(val);
 	else
 		val = cpu_to_le32(val);

 	__raw_writel(val, addr);
 }

 static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
 		int clk_id, unsigned int freq, int fsl_dir)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	u32 val_cr2, reg_cr2;

 	if (fsl_dir == FSL_FMT_TRANSMITTER)
 		reg_cr2 = FSL_SAI_TCR2;
 	else
 		reg_cr2 = FSL_SAI_RCR2;

 	val_cr2 = sai_readl(sai, sai->base + reg_cr2);
 	val_cr2 &= ~FSL_SAI_CR2_MSEL_MASK;

 	switch (clk_id) {
 	case FSL_SAI_CLK_BUS:
 		val_cr2 |= FSL_SAI_CR2_MSEL_BUS;
 		break;
 	case FSL_SAI_CLK_MAST1:
 		val_cr2 |= FSL_SAI_CR2_MSEL_MCLK1;
 		break;
 	case FSL_SAI_CLK_MAST2:
 		val_cr2 |= FSL_SAI_CR2_MSEL_MCLK2;
 		break;
 	case FSL_SAI_CLK_MAST3:
 		val_cr2 |= FSL_SAI_CR2_MSEL_MCLK3;
 		break;
 	default:
 		return -EINVAL;
 	}

 	sai_writel(sai, val_cr2, sai->base + reg_cr2);

 	return 0;
 }

 static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 		int clk_id, unsigned int freq, int dir)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int ret;

 	if (dir == SND_SOC_CLOCK_IN)
 		return 0;

 	ret = clk_prepare_enable(sai->clk);
 	if (ret)
 		return ret;

 	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
 					FSL_FMT_TRANSMITTER);
 	if (ret) {
 		dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
 		goto err_clk;
 	}

 	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
 					FSL_FMT_RECEIVER);
 	if (ret) {
 		dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);
 		goto err_clk;
 	}

 err_clk:
 	clk_disable_unprepare(sai->clk);

 	return ret;
 }

 static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
 				unsigned int fmt, int fsl_dir)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	u32 val_cr2, val_cr4, reg_cr2, reg_cr4;

 	if (fsl_dir == FSL_FMT_TRANSMITTER) {
 		reg_cr2 = FSL_SAI_TCR2;
 		reg_cr4 = FSL_SAI_TCR4;
 	} else {
 		reg_cr2 = FSL_SAI_RCR2;
 		reg_cr4 = FSL_SAI_RCR4;
 	}

 	val_cr2 = sai_readl(sai, sai->base + reg_cr2);
 	val_cr4 = sai_readl(sai, sai->base + reg_cr4);

 	if (sai->big_endian_data)
 		val_cr4 &= ~FSL_SAI_CR4_MF;
 	else
 		val_cr4 |= FSL_SAI_CR4_MF;

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		val_cr4 |= FSL_SAI_CR4_FSE;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_IB_IF:
 		val_cr4 |= FSL_SAI_CR4_FSP;
 		val_cr2 &= ~FSL_SAI_CR2_BCP;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		val_cr4 &= ~FSL_SAI_CR4_FSP;
 		val_cr2 &= ~FSL_SAI_CR2_BCP;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		val_cr4 |= FSL_SAI_CR4_FSP;
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		break;
 	case SND_SOC_DAIFMT_NB_NF:
 		val_cr4 &= ~FSL_SAI_CR4_FSP;
 		val_cr2 |= FSL_SAI_CR2_BCP;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		val_cr2 |= FSL_SAI_CR2_BCD_MSTR;
 		val_cr4 |= FSL_SAI_CR4_FSD_MSTR;
 		break;
 	case SND_SOC_DAIFMT_CBM_CFM:
 		val_cr2 &= ~FSL_SAI_CR2_BCD_MSTR;
 		val_cr4 &= ~FSL_SAI_CR4_FSD_MSTR;
 		break;
 	default:
 		return -EINVAL;
 	}

 	sai_writel(sai, val_cr2, sai->base + reg_cr2);
 	sai_writel(sai, val_cr4, sai->base + reg_cr4);

 	return 0;
 }

 static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	int ret;

 	ret = clk_prepare_enable(sai->clk);
 	if (ret)
 		return ret;

 	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
 	if (ret) {
 		dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
 		goto err_clk;
 	}

 	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
 	if (ret) {
 		dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);
 		goto err_clk;
 	}

 err_clk:
 	clk_disable_unprepare(sai->clk);

 	return ret;
 }

 static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
 		struct snd_pcm_hw_params *params,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	u32 val_cr4, val_cr5, val_mr, reg_cr4, reg_cr5, reg_mr;
 	unsigned int channels = params_channels(params);
 	u32 word_width = snd_pcm_format_width(params_format(params));

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		reg_cr4 = FSL_SAI_TCR4;
 		reg_cr5 = FSL_SAI_TCR5;
 		reg_mr = FSL_SAI_TMR;
 	} else {
 		reg_cr4 = FSL_SAI_RCR4;
 		reg_cr5 = FSL_SAI_RCR5;
 		reg_mr = FSL_SAI_RMR;
 	}

 	val_cr4 = sai_readl(sai, sai->base + reg_cr4);
 	val_cr4 &= ~FSL_SAI_CR4_SYWD_MASK;
 	val_cr4 &= ~FSL_SAI_CR4_FRSZ_MASK;

 	val_cr5 = sai_readl(sai, sai->base + reg_cr5);
 	val_cr5 &= ~FSL_SAI_CR5_WNW_MASK;
 	val_cr5 &= ~FSL_SAI_CR5_W0W_MASK;
 	val_cr5 &= ~FSL_SAI_CR5_FBT_MASK;

 	val_cr4 |= FSL_SAI_CR4_SYWD(word_width);
 	val_cr5 |= FSL_SAI_CR5_WNW(word_width);
 	val_cr5 |= FSL_SAI_CR5_W0W(word_width);

 	val_cr5 &= ~FSL_SAI_CR5_FBT_MASK;
 	if (sai->big_endian_data)
 		val_cr5 |= FSL_SAI_CR5_FBT(0);
 	else
 		val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);

 	val_cr4 |= FSL_SAI_CR4_FRSZ(channels);
 	val_mr = ~0UL - ((1 << channels) - 1);

 	sai_writel(sai, val_cr4, sai->base + reg_cr4);
 	sai_writel(sai, val_cr5, sai->base + reg_cr5);
 	sai_writel(sai, val_mr, sai->base + reg_mr);

 	return 0;
 }

 static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
 	u32 tcsr, rcsr, val_cr2, val_cr3, reg_cr3;

 	val_cr2 = sai_readl(sai, sai->base + FSL_SAI_TCR2);
 	val_cr2 &= ~FSL_SAI_CR2_SYNC;
 	sai_writel(sai, val_cr2, sai->base + FSL_SAI_TCR2);

 	val_cr2 = sai_readl(sai, sai->base + FSL_SAI_RCR2);
 	val_cr2 |= FSL_SAI_CR2_SYNC;
 	sai_writel(sai, val_cr2, sai->base + FSL_SAI_RCR2);

 	tcsr = sai_readl(sai, sai->base + FSL_SAI_TCSR);
 	rcsr = sai_readl(sai, sai->base + FSL_SAI_RCSR);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		tcsr |= FSL_SAI_CSR_FRDE;
 		rcsr &= ~FSL_SAI_CSR_FRDE;
 		reg_cr3 = FSL_SAI_TCR3;
 	} else {
 		rcsr |= FSL_SAI_CSR_FRDE;
 		tcsr &= ~FSL_SAI_CSR_FRDE;
 		reg_cr3 = FSL_SAI_RCR3;
 	}

 	val_cr3 = sai_readl(sai, sai->base + reg_cr3);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		tcsr |= FSL_SAI_CSR_TERE;
 		rcsr |= FSL_SAI_CSR_TERE;
 		val_cr3 |= FSL_SAI_CR3_TRCE;

 		sai_writel(sai, val_cr3, sai->base + reg_cr3);
 		sai_writel(sai, rcsr, sai->base + FSL_SAI_RCSR);
 		sai_writel(sai, tcsr, sai->base + FSL_SAI_TCSR);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		if (!(cpu_dai->playback_active || cpu_dai->capture_active)) {
 			tcsr &= ~FSL_SAI_CSR_TERE;
 			rcsr &= ~FSL_SAI_CSR_TERE;
 		}

 		val_cr3 &= ~FSL_SAI_CR3_TRCE;

 		sai_writel(sai, tcsr, sai->base + FSL_SAI_TCSR);
 		sai_writel(sai, rcsr, sai->base + FSL_SAI_RCSR);
 		sai_writel(sai, val_cr3, sai->base + reg_cr3);
 		break;
 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int fsl_sai_startup(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);

 	return clk_prepare_enable(sai->clk);
 }

 static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
 		struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);

 	clk_disable_unprepare(sai->clk);
 }

 static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
 	.set_sysclk	= fsl_sai_set_dai_sysclk,
 	.set_fmt	= fsl_sai_set_dai_fmt,
 	.hw_params	= fsl_sai_hw_params,
 	.trigger	= fsl_sai_trigger,
 	.startup	= fsl_sai_startup,
 	.shutdown	= fsl_sai_shutdown,
 };

 static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
 {
 	struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
 	int ret;

 	ret = clk_prepare_enable(sai->clk);
 	if (ret)
 		return ret;

 	sai_writel(sai, 0x0, sai->base + FSL_SAI_RCSR);
 	sai_writel(sai, 0x0, sai->base + FSL_SAI_TCSR);
 	sai_writel(sai, FSL_SAI_MAXBURST_TX * 2, sai->base + FSL_SAI_TCR1);
 	sai_writel(sai, FSL_SAI_MAXBURST_RX - 1, sai->base + FSL_SAI_RCR1);

 	clk_disable_unprepare(sai->clk);

 	snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
 				&sai->dma_params_rx);

 	snd_soc_dai_set_drvdata(cpu_dai, sai);

 	return 0;
 }

 static struct snd_soc_dai_driver fsl_sai_dai = {
 	.probe = fsl_sai_dai_probe,
 	.playback = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_96000,
 		.formats = FSL_SAI_FORMATS,
 	},
 	.capture = {
 		.channels_min = 1,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_8000_96000,
 		.formats = FSL_SAI_FORMATS,
 	},
 	.ops = &fsl_sai_pcm_dai_ops,
 };

 static const struct snd_soc_component_driver fsl_component = {
 	.name           = "fsl-sai",
 };

 static int fsl_sai_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct fsl_sai *sai;
 	struct resource *res;
 	int ret;

 	sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
 	if (!sai)
 		return -ENOMEM;

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

 	sai->clk = devm_clk_get(&pdev->dev, "sai");
 	if (IS_ERR(sai->clk)) {
 		dev_err(&pdev->dev, "Cannot get SAI's clock\n");
 		return PTR_ERR(sai->clk);
 	}

 	sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
 	sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
 	sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
 	sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;

 	sai->big_endian_regs = of_property_read_bool(np, "big-endian-regs");
 	sai->big_endian_data = of_property_read_bool(np, "big-endian-data");

 	platform_set_drvdata(pdev, sai);

 	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
 			&fsl_sai_dai, 1);
 	if (ret)
 		return ret;

 	return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
 			SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
 }

 static const struct of_device_id fsl_sai_ids[] = {
 	{ .compatible = "fsl,vf610-sai", },
 	{ /* sentinel */ }
 };

 static struct platform_driver fsl_sai_driver = {
 	.probe = fsl_sai_probe,
 	.driver = {
 		.name = "fsl-sai",
 		.owner = THIS_MODULE,
 		.of_match_table = fsl_sai_ids,
 	},
 };
 module_platform_driver(fsl_sai_driver);

 MODULE_DESCRIPTION("Freescale Soc SAI Interface");
 MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
 MODULE_ALIAS("platform:fsl-sai");
 MODULE_LICENSE("GPL");
	/*
	* Freescale ALSA SoC Digital Audio Interface (SAI) driver.
	*
	* Copyright 2012-2013 Freescale Semiconductor, Inc.
	*
	* 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/clk.h>
	#include <linux/delay.h>
	#include <linux/dmaengine.h>
	#include <linux/module.h>
	#include <linux/of_address.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/dmaengine_pcm.h>
	#include <sound/pcm_params.h>

	#include "fsl_sai.h"

	static inline u32 sai_readl(struct fsl_sai *sai,
	const void __iomem *addr)
	{
	u32 val;

	val = __raw_readl(addr);

	if (likely(sai->big_endian_regs))
	val = be32_to_cpu(val);
	else
	val = le32_to_cpu(val);
	rmb();

	return val;
	}

	static inline void sai_writel(struct fsl_sai *sai,
	u32 val, void __iomem *addr)
	{
	wmb();
	if (likely(sai->big_endian_regs))
	val = cpu_to_be32(val);
	else
	val = cpu_to_le32(val);

	__raw_writel(val, addr);
	}

	static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int fsl_dir)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	u32 val_cr2, reg_cr2;

	if (fsl_dir == FSL_FMT_TRANSMITTER)
	reg_cr2 = FSL_SAI_TCR2;
	else
	reg_cr2 = FSL_SAI_RCR2;

	val_cr2 = sai_readl(sai, sai->base + reg_cr2);
	val_cr2 &= ~FSL_SAI_CR2_MSEL_MASK;

	switch (clk_id) {
	case FSL_SAI_CLK_BUS:
	val_cr2 \|= FSL_SAI_CR2_MSEL_BUS;
	break;
	case FSL_SAI_CLK_MAST1:
	val_cr2 \|= FSL_SAI_CR2_MSEL_MCLK1;
	break;
	case FSL_SAI_CLK_MAST2:
	val_cr2 \|= FSL_SAI_CR2_MSEL_MCLK2;
	break;
	case FSL_SAI_CLK_MAST3:
	val_cr2 \|= FSL_SAI_CR2_MSEL_MCLK3;
	break;
	default:
	return -EINVAL;
	}

	sai_writel(sai, val_cr2, sai->base + reg_cr2);

	return 0;
	}

	static int fsl_sai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int dir)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int ret;

	if (dir == SND_SOC_CLOCK_IN)
	return 0;

	ret = clk_prepare_enable(sai->clk);
	if (ret)
	return ret;

	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
	FSL_FMT_TRANSMITTER);
	if (ret) {
	dev_err(cpu_dai->dev, "Cannot set tx sysclk: %d\n", ret);
	goto err_clk;
	}

	ret = fsl_sai_set_dai_sysclk_tr(cpu_dai, clk_id, freq,
	FSL_FMT_RECEIVER);
	if (ret) {
	dev_err(cpu_dai->dev, "Cannot set rx sysclk: %d\n", ret);
	goto err_clk;
	}

	err_clk:
	clk_disable_unprepare(sai->clk);

	return ret;
	}

	static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai,
	unsigned int fmt, int fsl_dir)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	u32 val_cr2, val_cr4, reg_cr2, reg_cr4;

	if (fsl_dir == FSL_FMT_TRANSMITTER) {
	reg_cr2 = FSL_SAI_TCR2;
	reg_cr4 = FSL_SAI_TCR4;
	} else {
	reg_cr2 = FSL_SAI_RCR2;
	reg_cr4 = FSL_SAI_RCR4;
	}

	val_cr2 = sai_readl(sai, sai->base + reg_cr2);
	val_cr4 = sai_readl(sai, sai->base + reg_cr4);

	if (sai->big_endian_data)
	val_cr4 &= ~FSL_SAI_CR4_MF;
	else
	val_cr4 \|= FSL_SAI_CR4_MF;

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	val_cr4 \|= FSL_SAI_CR4_FSE;
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_IB_IF:
	val_cr4 \|= FSL_SAI_CR4_FSP;
	val_cr2 &= ~FSL_SAI_CR2_BCP;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	val_cr4 &= ~FSL_SAI_CR4_FSP;
	val_cr2 &= ~FSL_SAI_CR2_BCP;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	val_cr4 \|= FSL_SAI_CR4_FSP;
	val_cr2 \|= FSL_SAI_CR2_BCP;
	break;
	case SND_SOC_DAIFMT_NB_NF:
	val_cr4 &= ~FSL_SAI_CR4_FSP;
	val_cr2 \|= FSL_SAI_CR2_BCP;
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	val_cr2 \|= FSL_SAI_CR2_BCD_MSTR;
	val_cr4 \|= FSL_SAI_CR4_FSD_MSTR;
	break;
	case SND_SOC_DAIFMT_CBM_CFM:
	val_cr2 &= ~FSL_SAI_CR2_BCD_MSTR;
	val_cr4 &= ~FSL_SAI_CR4_FSD_MSTR;
	break;
	default:
	return -EINVAL;
	}

	sai_writel(sai, val_cr2, sai->base + reg_cr2);
	sai_writel(sai, val_cr4, sai->base + reg_cr4);

	return 0;
	}

	static int fsl_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int ret;

	ret = clk_prepare_enable(sai->clk);
	if (ret)
	return ret;

	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_TRANSMITTER);
	if (ret) {
	dev_err(cpu_dai->dev, "Cannot set tx format: %d\n", ret);
	goto err_clk;
	}

	ret = fsl_sai_set_dai_fmt_tr(cpu_dai, fmt, FSL_FMT_RECEIVER);
	if (ret) {
	dev_err(cpu_dai->dev, "Cannot set rx format: %d\n", ret);
	goto err_clk;
	}

	err_clk:
	clk_disable_unprepare(sai->clk);

	return ret;
	}

	static int fsl_sai_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	u32 val_cr4, val_cr5, val_mr, reg_cr4, reg_cr5, reg_mr;
	unsigned int channels = params_channels(params);
	u32 word_width = snd_pcm_format_width(params_format(params));

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	reg_cr4 = FSL_SAI_TCR4;
	reg_cr5 = FSL_SAI_TCR5;
	reg_mr = FSL_SAI_TMR;
	} else {
	reg_cr4 = FSL_SAI_RCR4;
	reg_cr5 = FSL_SAI_RCR5;
	reg_mr = FSL_SAI_RMR;
	}

	val_cr4 = sai_readl(sai, sai->base + reg_cr4);
	val_cr4 &= ~FSL_SAI_CR4_SYWD_MASK;
	val_cr4 &= ~FSL_SAI_CR4_FRSZ_MASK;

	val_cr5 = sai_readl(sai, sai->base + reg_cr5);
	val_cr5 &= ~FSL_SAI_CR5_WNW_MASK;
	val_cr5 &= ~FSL_SAI_CR5_W0W_MASK;
	val_cr5 &= ~FSL_SAI_CR5_FBT_MASK;

	val_cr4 \|= FSL_SAI_CR4_SYWD(word_width);
	val_cr5 \|= FSL_SAI_CR5_WNW(word_width);
	val_cr5 \|= FSL_SAI_CR5_W0W(word_width);

	val_cr5 &= ~FSL_SAI_CR5_FBT_MASK;
	if (sai->big_endian_data)
	val_cr5 \|= FSL_SAI_CR5_FBT(0);
	else
	val_cr5 \|= FSL_SAI_CR5_FBT(word_width - 1);

	val_cr4 \|= FSL_SAI_CR4_FRSZ(channels);
	val_mr = ~0UL - ((1 << channels) - 1);

	sai_writel(sai, val_cr4, sai->base + reg_cr4);
	sai_writel(sai, val_cr5, sai->base + reg_cr5);
	sai_writel(sai, val_mr, sai->base + reg_mr);

	return 0;
	}

	static int fsl_sai_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
	u32 tcsr, rcsr, val_cr2, val_cr3, reg_cr3;

	val_cr2 = sai_readl(sai, sai->base + FSL_SAI_TCR2);
	val_cr2 &= ~FSL_SAI_CR2_SYNC;
	sai_writel(sai, val_cr2, sai->base + FSL_SAI_TCR2);

	val_cr2 = sai_readl(sai, sai->base + FSL_SAI_RCR2);
	val_cr2 \|= FSL_SAI_CR2_SYNC;
	sai_writel(sai, val_cr2, sai->base + FSL_SAI_RCR2);

	tcsr = sai_readl(sai, sai->base + FSL_SAI_TCSR);
	rcsr = sai_readl(sai, sai->base + FSL_SAI_RCSR);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	tcsr \|= FSL_SAI_CSR_FRDE;
	rcsr &= ~FSL_SAI_CSR_FRDE;
	reg_cr3 = FSL_SAI_TCR3;
	} else {
	rcsr \|= FSL_SAI_CSR_FRDE;
	tcsr &= ~FSL_SAI_CSR_FRDE;
	reg_cr3 = FSL_SAI_RCR3;
	}

	val_cr3 = sai_readl(sai, sai->base + reg_cr3);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	tcsr \|= FSL_SAI_CSR_TERE;
	rcsr \|= FSL_SAI_CSR_TERE;
	val_cr3 \|= FSL_SAI_CR3_TRCE;

	sai_writel(sai, val_cr3, sai->base + reg_cr3);
	sai_writel(sai, rcsr, sai->base + FSL_SAI_RCSR);
	sai_writel(sai, tcsr, sai->base + FSL_SAI_TCSR);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	if (!(cpu_dai->playback_active \|\| cpu_dai->capture_active)) {
	tcsr &= ~FSL_SAI_CSR_TERE;
	rcsr &= ~FSL_SAI_CSR_TERE;
	}

	val_cr3 &= ~FSL_SAI_CR3_TRCE;

	sai_writel(sai, tcsr, sai->base + FSL_SAI_TCSR);
	sai_writel(sai, rcsr, sai->base + FSL_SAI_RCSR);
	sai_writel(sai, val_cr3, sai->base + reg_cr3);
	break;
	default:
	return -EINVAL;
	}

	return 0;
	}

	static int fsl_sai_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);

	return clk_prepare_enable(sai->clk);
	}

	static void fsl_sai_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);

	clk_disable_unprepare(sai->clk);
	}

	static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = {
	.set_sysclk = fsl_sai_set_dai_sysclk,
	.set_fmt = fsl_sai_set_dai_fmt,
	.hw_params = fsl_sai_hw_params,
	.trigger = fsl_sai_trigger,
	.startup = fsl_sai_startup,
	.shutdown = fsl_sai_shutdown,
	};

	static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
	{
	struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
	int ret;

	ret = clk_prepare_enable(sai->clk);
	if (ret)
	return ret;

	sai_writel(sai, 0x0, sai->base + FSL_SAI_RCSR);
	sai_writel(sai, 0x0, sai->base + FSL_SAI_TCSR);
	sai_writel(sai, FSL_SAI_MAXBURST_TX * 2, sai->base + FSL_SAI_TCR1);
	sai_writel(sai, FSL_SAI_MAXBURST_RX - 1, sai->base + FSL_SAI_RCR1);

	clk_disable_unprepare(sai->clk);

	snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params_tx,
	&sai->dma_params_rx);

	snd_soc_dai_set_drvdata(cpu_dai, sai);

	return 0;
	}

	static struct snd_soc_dai_driver fsl_sai_dai = {
	.probe = fsl_sai_dai_probe,
	.playback = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_96000,
	.formats = FSL_SAI_FORMATS,
	},
	.capture = {
	.channels_min = 1,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_96000,
	.formats = FSL_SAI_FORMATS,
	},
	.ops = &fsl_sai_pcm_dai_ops,
	};

	static const struct snd_soc_component_driver fsl_component = {
	.name = "fsl-sai",
	};

	static int fsl_sai_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct fsl_sai *sai;
	struct resource *res;
	int ret;

	sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
	if (!sai)
	return -ENOMEM;

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

	sai->clk = devm_clk_get(&pdev->dev, "sai");
	if (IS_ERR(sai->clk)) {
	dev_err(&pdev->dev, "Cannot get SAI's clock\n");
	return PTR_ERR(sai->clk);
	}

	sai->dma_params_rx.addr = res->start + FSL_SAI_RDR;
	sai->dma_params_tx.addr = res->start + FSL_SAI_TDR;
	sai->dma_params_rx.maxburst = FSL_SAI_MAXBURST_RX;
	sai->dma_params_tx.maxburst = FSL_SAI_MAXBURST_TX;

	sai->big_endian_regs = of_property_read_bool(np, "big-endian-regs");
	sai->big_endian_data = of_property_read_bool(np, "big-endian-data");

	platform_set_drvdata(pdev, sai);

	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
	&fsl_sai_dai, 1);
	if (ret)
	return ret;

	return devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
	SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
	}

	static const struct of_device_id fsl_sai_ids[] = {
	{ .compatible = "fsl,vf610-sai", },
	{ /* sentinel */ }
	};

	static struct platform_driver fsl_sai_driver = {
	.probe = fsl_sai_probe,
	.driver = {
	.name = "fsl-sai",
	.owner = THIS_MODULE,
	.of_match_table = fsl_sai_ids,
	},
	};
	module_platform_driver(fsl_sai_driver);

	MODULE_DESCRIPTION("Freescale Soc SAI Interface");
	MODULE_AUTHOR("Xiubo Li, <Li.Xiubo@freescale.com>");
	MODULE_ALIAS("platform:fsl-sai");
	MODULE_LICENSE("GPL");