sound/soc/s3c24xx/s3c-pcm.c - kernel/msm-4.9 - Gitiles

 /* sound/soc/s3c24xx/s3c-pcm.c
  *
  * ALSA SoC Audio Layer - S3C PCM-Controller driver
  *
  * Copyright (c) 2009 Samsung Electronics Co. Ltd
  * Author: Jaswinder Singh <jassi.brar@samsung.com>
  * based upon I2S drivers by Ben Dooks.
  *
  * 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/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/kernel.h>
 #include <linux/gpio.h>
 #include <linux/io.h>

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

 #include <plat/audio.h>
 #include <plat/dma.h>

 #include "s3c-dma.h"
 #include "s3c-pcm.h"

 static struct s3c2410_dma_client s3c_pcm_dma_client_out = {
 	.name		= "PCM Stereo out"
 };

 static struct s3c2410_dma_client s3c_pcm_dma_client_in = {
 	.name		= "PCM Stereo in"
 };

 static struct s3c_dma_params s3c_pcm_stereo_out[] = {
 	[0] = {
 		.client		= &s3c_pcm_dma_client_out,
 		.dma_size	= 4,
 	},
 	[1] = {
 		.client		= &s3c_pcm_dma_client_out,
 		.dma_size	= 4,
 	},
 };

 static struct s3c_dma_params s3c_pcm_stereo_in[] = {
 	[0] = {
 		.client		= &s3c_pcm_dma_client_in,
 		.dma_size	= 4,
 	},
 	[1] = {
 		.client		= &s3c_pcm_dma_client_in,
 		.dma_size	= 4,
 	},
 };

 static struct s3c_pcm_info s3c_pcm[2];

 static inline struct s3c_pcm_info *to_info(struct snd_soc_dai *cpu_dai)
 {
 	return cpu_dai->private_data;
 }

 static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
 {
 	void __iomem *regs = pcm->regs;
 	u32 ctl, clkctl;

 	clkctl = readl(regs + S3C_PCM_CLKCTL);
 	ctl = readl(regs + S3C_PCM_CTL);
 	ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
 			 << S3C_PCM_CTL_TXDIPSTICK_SHIFT);

 	if (on) {
 		ctl |= S3C_PCM_CTL_TXDMA_EN;
 		ctl |= S3C_PCM_CTL_TXFIFO_EN;
 		ctl |= S3C_PCM_CTL_ENABLE;
 		ctl |= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
 		clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 	} else {
 		ctl &= ~S3C_PCM_CTL_TXDMA_EN;
 		ctl &= ~S3C_PCM_CTL_TXFIFO_EN;

 		if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
 			ctl &= ~S3C_PCM_CTL_ENABLE;
 			if (!pcm->idleclk)
 				clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 		}
 	}

 	writel(clkctl, regs + S3C_PCM_CLKCTL);
 	writel(ctl, regs + S3C_PCM_CTL);
 }

 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
 {
 	void __iomem *regs = pcm->regs;
 	u32 ctl, clkctl;

 	ctl = readl(regs + S3C_PCM_CTL);
 	clkctl = readl(regs + S3C_PCM_CLKCTL);

 	if (on) {
 		ctl |= S3C_PCM_CTL_RXDMA_EN;
 		ctl |= S3C_PCM_CTL_RXFIFO_EN;
 		ctl |= S3C_PCM_CTL_ENABLE;
 		clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 	} else {
 		ctl &= ~S3C_PCM_CTL_RXDMA_EN;
 		ctl &= ~S3C_PCM_CTL_RXFIFO_EN;

 		if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
 			ctl &= ~S3C_PCM_CTL_ENABLE;
 			if (!pcm->idleclk)
 				clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 		}
 	}

 	writel(clkctl, regs + S3C_PCM_CLKCTL);
 	writel(ctl, regs + S3C_PCM_CTL);
 }

 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
 			       struct snd_soc_dai *dai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct s3c_pcm_info *pcm = to_info(rtd->dai->cpu_dai);
 	unsigned long flags;

 	dev_dbg(pcm->dev, "Entered %s\n", __func__);

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		spin_lock_irqsave(&pcm->lock, flags);

 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			s3c_pcm_snd_rxctrl(pcm, 1);
 		else
 			s3c_pcm_snd_txctrl(pcm, 1);

 		spin_unlock_irqrestore(&pcm->lock, flags);
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		spin_lock_irqsave(&pcm->lock, flags);

 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			s3c_pcm_snd_rxctrl(pcm, 0);
 		else
 			s3c_pcm_snd_txctrl(pcm, 0);

 		spin_unlock_irqrestore(&pcm->lock, flags);
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *params,
 				 struct snd_soc_dai *socdai)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dai_link *dai = rtd->dai;
 	struct s3c_pcm_info *pcm = to_info(dai->cpu_dai);
 	struct s3c_dma_params *dma_data;
 	void __iomem *regs = pcm->regs;
 	struct clk *clk;
 	int sclk_div, sync_div;
 	unsigned long flags;
 	u32 clkctl;

 	dev_dbg(pcm->dev, "Entered %s\n", __func__);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		dma_data = pcm->dma_playback;
 	else
 		dma_data = pcm->dma_capture;

 	snd_soc_dai_set_dma_data(dai->cpu_dai, substream, dma_data);

 	/* Strictly check for sample size */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
 	default:
 		return -EINVAL;
 	}

 	spin_lock_irqsave(&pcm->lock, flags);

 	/* Get hold of the PCMSOURCE_CLK */
 	clkctl = readl(regs + S3C_PCM_CLKCTL);
 	if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
 		clk = pcm->pclk;
 	else
 		clk = pcm->cclk;

 	/* Set the SCLK divider */
 	sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
 					params_rate(params) / 2 - 1;

 	clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
 			<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 	clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
 			<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);

 	/* Set the SYNC divider */
 	sync_div = pcm->sclk_per_fs - 1;

 	clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
 				<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 	clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
 				<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);

 	writel(clkctl, regs + S3C_PCM_CLKCTL);

 	spin_unlock_irqrestore(&pcm->lock, flags);

 	dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
 				clk_get_rate(clk), pcm->sclk_per_fs,
 				sclk_div, sync_div);

 	return 0;
 }

 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
 			       unsigned int fmt)
 {
 	struct s3c_pcm_info *pcm = to_info(cpu_dai);
 	void __iomem *regs = pcm->regs;
 	unsigned long flags;
 	int ret = 0;
 	u32 ctl;

 	dev_dbg(pcm->dev, "Entered %s\n", __func__);

 	spin_lock_irqsave(&pcm->lock, flags);

 	ctl = readl(regs + S3C_PCM_CTL);

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		/* Nothing to do, NB_NF by default */
 		break;
 	default:
 		dev_err(pcm->dev, "Unsupported clock inversion!\n");
 		ret = -EINVAL;
 		goto exit;
 	}

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBS_CFS:
 		/* Nothing to do, Master by default */
 		break;
 	default:
 		dev_err(pcm->dev, "Unsupported master/slave format!\n");
 		ret = -EINVAL;
 		goto exit;
 	}

 	switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
 	case SND_SOC_DAIFMT_CONT:
 		pcm->idleclk = 1;
 		break;
 	case SND_SOC_DAIFMT_GATED:
 		pcm->idleclk = 0;
 		break;
 	default:
 		dev_err(pcm->dev, "Invalid Clock gating request!\n");
 		ret = -EINVAL;
 		goto exit;
 	}

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_DSP_A:
 		ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 		ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 		break;
 	case SND_SOC_DAIFMT_DSP_B:
 		ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 		ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 		break;
 	default:
 		dev_err(pcm->dev, "Unsupported data format!\n");
 		ret = -EINVAL;
 		goto exit;
 	}

 	writel(ctl, regs + S3C_PCM_CTL);

 exit:
 	spin_unlock_irqrestore(&pcm->lock, flags);

 	return ret;
 }

 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
 						int div_id, int div)
 {
 	struct s3c_pcm_info *pcm = to_info(cpu_dai);

 	switch (div_id) {
 	case S3C_PCM_SCLK_PER_FS:
 		pcm->sclk_per_fs = div;
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
 				  int clk_id, unsigned int freq, int dir)
 {
 	struct s3c_pcm_info *pcm = to_info(cpu_dai);
 	void __iomem *regs = pcm->regs;
 	u32 clkctl = readl(regs + S3C_PCM_CLKCTL);

 	switch (clk_id) {
 	case S3C_PCM_CLKSRC_PCLK:
 		clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 		break;

 	case S3C_PCM_CLKSRC_MUX:
 		clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;

 		if (clk_get_rate(pcm->cclk) != freq)
 			clk_set_rate(pcm->cclk, freq);

 		break;

 	default:
 		return -EINVAL;
 	}

 	writel(clkctl, regs + S3C_PCM_CLKCTL);

 	return 0;
 }

 static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
 	.set_sysclk	= s3c_pcm_set_sysclk,
 	.set_clkdiv	= s3c_pcm_set_clkdiv,
 	.trigger	= s3c_pcm_trigger,
 	.hw_params	= s3c_pcm_hw_params,
 	.set_fmt	= s3c_pcm_set_fmt,
 };

 #define S3C_PCM_RATES  SNDRV_PCM_RATE_8000_96000

 #define S3C_PCM_DECLARE(n)			\
 {								\
 	.name		 = "samsung-pcm",			\
 	.id		 = (n),				\
 	.symmetric_rates = 1,					\
 	.ops = &s3c_pcm_dai_ops,				\
 	.playback = {						\
 		.channels_min	= 2,				\
 		.channels_max	= 2,				\
 		.rates		= S3C_PCM_RATES,		\
 		.formats	= SNDRV_PCM_FMTBIT_S16_LE,	\
 	},							\
 	.capture = {						\
 		.channels_min	= 2,				\
 		.channels_max	= 2,				\
 		.rates		= S3C_PCM_RATES,		\
 		.formats	= SNDRV_PCM_FMTBIT_S16_LE,	\
 	},							\
 }

 struct snd_soc_dai s3c_pcm_dai[] = {
 	S3C_PCM_DECLARE(0),
 	S3C_PCM_DECLARE(1),
 };
 EXPORT_SYMBOL_GPL(s3c_pcm_dai);

 static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
 {
 	struct s3c_pcm_info *pcm;
 	struct snd_soc_dai *dai;
 	struct resource *mem_res, *dmatx_res, *dmarx_res;
 	struct s3c_audio_pdata *pcm_pdata;
 	int ret;

 	/* Check for valid device index */
 	if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
 		dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 		return -EINVAL;
 	}

 	pcm_pdata = pdev->dev.platform_data;

 	/* Check for availability of necessary resource */
 	dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 	if (!dmatx_res) {
 		dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
 		return -ENXIO;
 	}

 	dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 	if (!dmarx_res) {
 		dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
 		return -ENXIO;
 	}

 	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!mem_res) {
 		dev_err(&pdev->dev, "Unable to get register resource\n");
 		return -ENXIO;
 	}

 	if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
 		dev_err(&pdev->dev, "Unable to configure gpio\n");
 		return -EINVAL;
 	}

 	pcm = &s3c_pcm[pdev->id];
 	pcm->dev = &pdev->dev;

 	spin_lock_init(&pcm->lock);

 	dai = &s3c_pcm_dai[pdev->id];
 	dai->dev = &pdev->dev;

 	/* Default is 128fs */
 	pcm->sclk_per_fs = 128;

 	pcm->cclk = clk_get(&pdev->dev, "audio-bus");
 	if (IS_ERR(pcm->cclk)) {
 		dev_err(&pdev->dev, "failed to get audio-bus\n");
 		ret = PTR_ERR(pcm->cclk);
 		goto err1;
 	}
 	clk_enable(pcm->cclk);

 	/* record our pcm structure for later use in the callbacks */
 	dai->private_data = pcm;

 	if (!request_mem_region(mem_res->start,
 				resource_size(mem_res), "samsung-pcm")) {
 		dev_err(&pdev->dev, "Unable to request register region\n");
 		ret = -EBUSY;
 		goto err2;
 	}

 	pcm->regs = ioremap(mem_res->start, 0x100);
 	if (pcm->regs == NULL) {
 		dev_err(&pdev->dev, "cannot ioremap registers\n");
 		ret = -ENXIO;
 		goto err3;
 	}

 	pcm->pclk = clk_get(&pdev->dev, "pcm");
 	if (IS_ERR(pcm->pclk)) {
 		dev_err(&pdev->dev, "failed to get pcm_clock\n");
 		ret = -ENOENT;
 		goto err4;
 	}
 	clk_enable(pcm->pclk);

 	ret = snd_soc_register_dai(dai);
 	if (ret != 0) {
 		dev_err(&pdev->dev, "failed to get pcm_clock\n");
 		goto err5;
 	}

 	s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
 							+ S3C_PCM_RXFIFO;
 	s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
 							+ S3C_PCM_TXFIFO;

 	s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
 	s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;

 	pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
 	pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];

 	return 0;

 err5:
 	clk_disable(pcm->pclk);
 	clk_put(pcm->pclk);
 err4:
 	iounmap(pcm->regs);
 err3:
 	release_mem_region(mem_res->start, resource_size(mem_res));
 err2:
 	clk_disable(pcm->cclk);
 	clk_put(pcm->cclk);
 err1:
 	return ret;
 }

 static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
 {
 	struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
 	struct resource *mem_res;

 	iounmap(pcm->regs);

 	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(mem_res->start, resource_size(mem_res));

 	clk_disable(pcm->cclk);
 	clk_disable(pcm->pclk);
 	clk_put(pcm->pclk);
 	clk_put(pcm->cclk);

 	return 0;
 }

 static struct platform_driver s3c_pcm_driver = {
 	.probe  = s3c_pcm_dev_probe,
 	.remove = s3c_pcm_dev_remove,
 	.driver = {
 		.name = "samsung-pcm",
 		.owner = THIS_MODULE,
 	},
 };

 static int __init s3c_pcm_init(void)
 {
 	return platform_driver_register(&s3c_pcm_driver);
 }
 module_init(s3c_pcm_init);

 static void __exit s3c_pcm_exit(void)
 {
 	platform_driver_unregister(&s3c_pcm_driver);
 }
 module_exit(s3c_pcm_exit);

 /* Module information */
 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
 MODULE_DESCRIPTION("S3C PCM Controller Driver");
 MODULE_LICENSE("GPL");
	/* sound/soc/s3c24xx/s3c-pcm.c
	*
	* ALSA SoC Audio Layer - S3C PCM-Controller driver
	*
	* Copyright (c) 2009 Samsung Electronics Co. Ltd
	* Author: Jaswinder Singh <jassi.brar@samsung.com>
	* based upon I2S drivers by Ben Dooks.
	*
	* 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/init.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/kernel.h>
	#include <linux/gpio.h>
	#include <linux/io.h>

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

	#include <plat/audio.h>
	#include <plat/dma.h>

	#include "s3c-dma.h"
	#include "s3c-pcm.h"

	static struct s3c2410_dma_client s3c_pcm_dma_client_out = {
	.name = "PCM Stereo out"
	};

	static struct s3c2410_dma_client s3c_pcm_dma_client_in = {
	.name = "PCM Stereo in"
	};

	static struct s3c_dma_params s3c_pcm_stereo_out[] = {
	[0] = {
	.client = &s3c_pcm_dma_client_out,
	.dma_size = 4,
	},
	[1] = {
	.client = &s3c_pcm_dma_client_out,
	.dma_size = 4,
	},
	};

	static struct s3c_dma_params s3c_pcm_stereo_in[] = {
	[0] = {
	.client = &s3c_pcm_dma_client_in,
	.dma_size = 4,
	},
	[1] = {
	.client = &s3c_pcm_dma_client_in,
	.dma_size = 4,
	},
	};

	static struct s3c_pcm_info s3c_pcm[2];

	static inline struct s3c_pcm_info to_info(struct snd_soc_dai cpu_dai)
	{
	return cpu_dai->private_data;
	}

	static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
	{
	void __iomem *regs = pcm->regs;
	u32 ctl, clkctl;

	clkctl = readl(regs + S3C_PCM_CLKCTL);
	ctl = readl(regs + S3C_PCM_CTL);
	ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
	<< S3C_PCM_CTL_TXDIPSTICK_SHIFT);

	if (on) {
	ctl \|= S3C_PCM_CTL_TXDMA_EN;
	ctl \|= S3C_PCM_CTL_TXFIFO_EN;
	ctl \|= S3C_PCM_CTL_ENABLE;
	ctl \|= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	} else {
	ctl &= ~S3C_PCM_CTL_TXDMA_EN;
	ctl &= ~S3C_PCM_CTL_TXFIFO_EN;

	if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
	ctl &= ~S3C_PCM_CTL_ENABLE;
	if (!pcm->idleclk)
	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	}
	}

	writel(clkctl, regs + S3C_PCM_CLKCTL);
	writel(ctl, regs + S3C_PCM_CTL);
	}

	static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
	{
	void __iomem *regs = pcm->regs;
	u32 ctl, clkctl;

	ctl = readl(regs + S3C_PCM_CTL);
	clkctl = readl(regs + S3C_PCM_CLKCTL);

	if (on) {
	ctl \|= S3C_PCM_CTL_RXDMA_EN;
	ctl \|= S3C_PCM_CTL_RXFIFO_EN;
	ctl \|= S3C_PCM_CTL_ENABLE;
	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	} else {
	ctl &= ~S3C_PCM_CTL_RXDMA_EN;
	ctl &= ~S3C_PCM_CTL_RXFIFO_EN;

	if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
	ctl &= ~S3C_PCM_CTL_ENABLE;
	if (!pcm->idleclk)
	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	}
	}

	writel(clkctl, regs + S3C_PCM_CLKCTL);
	writel(ctl, regs + S3C_PCM_CTL);
	}

	static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct s3c_pcm_info *pcm = to_info(rtd->dai->cpu_dai);
	unsigned long flags;

	dev_dbg(pcm->dev, "Entered %s\n", __func__);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	spin_lock_irqsave(&pcm->lock, flags);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	s3c_pcm_snd_rxctrl(pcm, 1);
	else
	s3c_pcm_snd_txctrl(pcm, 1);

	spin_unlock_irqrestore(&pcm->lock, flags);
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	spin_lock_irqsave(&pcm->lock, flags);

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	s3c_pcm_snd_rxctrl(pcm, 0);
	else
	s3c_pcm_snd_txctrl(pcm, 0);

	spin_unlock_irqrestore(&pcm->lock, flags);
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *socdai)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai_link *dai = rtd->dai;
	struct s3c_pcm_info *pcm = to_info(dai->cpu_dai);
	struct s3c_dma_params *dma_data;
	void __iomem *regs = pcm->regs;
	struct clk *clk;
	int sclk_div, sync_div;
	unsigned long flags;
	u32 clkctl;

	dev_dbg(pcm->dev, "Entered %s\n", __func__);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	dma_data = pcm->dma_playback;
	else
	dma_data = pcm->dma_capture;

	snd_soc_dai_set_dma_data(dai->cpu_dai, substream, dma_data);

	/* Strictly check for sample size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	break;
	default:
	return -EINVAL;
	}

	spin_lock_irqsave(&pcm->lock, flags);

	/* Get hold of the PCMSOURCE_CLK */
	clkctl = readl(regs + S3C_PCM_CLKCTL);
	if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
	clk = pcm->pclk;
	else
	clk = pcm->cclk;

	/* Set the SCLK divider */
	sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
	params_rate(params) / 2 - 1;

	clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
	<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
	clkctl \|= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
	<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);

	/* Set the SYNC divider */
	sync_div = pcm->sclk_per_fs - 1;

	clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
	<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
	clkctl \|= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
	<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);

	writel(clkctl, regs + S3C_PCM_CLKCTL);

	spin_unlock_irqrestore(&pcm->lock, flags);

	dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
	clk_get_rate(clk), pcm->sclk_per_fs,
	sclk_div, sync_div);

	return 0;
	}

	static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
	unsigned int fmt)
	{
	struct s3c_pcm_info *pcm = to_info(cpu_dai);
	void __iomem *regs = pcm->regs;
	unsigned long flags;
	int ret = 0;
	u32 ctl;

	dev_dbg(pcm->dev, "Entered %s\n", __func__);

	spin_lock_irqsave(&pcm->lock, flags);

	ctl = readl(regs + S3C_PCM_CTL);

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	/* Nothing to do, NB_NF by default */
	break;
	default:
	dev_err(pcm->dev, "Unsupported clock inversion!\n");
	ret = -EINVAL;
	goto exit;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
	/* Nothing to do, Master by default */
	break;
	default:
	dev_err(pcm->dev, "Unsupported master/slave format!\n");
	ret = -EINVAL;
	goto exit;
	}

	switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
	case SND_SOC_DAIFMT_CONT:
	pcm->idleclk = 1;
	break;
	case SND_SOC_DAIFMT_GATED:
	pcm->idleclk = 0;
	break;
	default:
	dev_err(pcm->dev, "Invalid Clock gating request!\n");
	ret = -EINVAL;
	goto exit;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_DSP_A:
	ctl \|= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
	ctl \|= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
	break;
	case SND_SOC_DAIFMT_DSP_B:
	ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
	ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
	break;
	default:
	dev_err(pcm->dev, "Unsupported data format!\n");
	ret = -EINVAL;
	goto exit;
	}

	writel(ctl, regs + S3C_PCM_CTL);

	exit:
	spin_unlock_irqrestore(&pcm->lock, flags);

	return ret;
	}

	static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
	int div_id, int div)
	{
	struct s3c_pcm_info *pcm = to_info(cpu_dai);

	switch (div_id) {
	case S3C_PCM_SCLK_PER_FS:
	pcm->sclk_per_fs = div;
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int dir)
	{
	struct s3c_pcm_info *pcm = to_info(cpu_dai);
	void __iomem *regs = pcm->regs;
	u32 clkctl = readl(regs + S3C_PCM_CLKCTL);

	switch (clk_id) {
	case S3C_PCM_CLKSRC_PCLK:
	clkctl \|= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
	break;

	case S3C_PCM_CLKSRC_MUX:
	clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;

	if (clk_get_rate(pcm->cclk) != freq)
	clk_set_rate(pcm->cclk, freq);

	break;

	default:
	return -EINVAL;
	}

	writel(clkctl, regs + S3C_PCM_CLKCTL);

	return 0;
	}

	static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
	.set_sysclk = s3c_pcm_set_sysclk,
	.set_clkdiv = s3c_pcm_set_clkdiv,
	.trigger = s3c_pcm_trigger,
	.hw_params = s3c_pcm_hw_params,
	.set_fmt = s3c_pcm_set_fmt,
	};

	#define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000

	#define S3C_PCM_DECLARE(n) \
	{ \
	.name = "samsung-pcm", \
	.id = (n), \
	.symmetric_rates = 1, \
	.ops = &s3c_pcm_dai_ops, \
	.playback = { \
	.channels_min = 2, \
	.channels_max = 2, \
	.rates = S3C_PCM_RATES, \
	.formats = SNDRV_PCM_FMTBIT_S16_LE, \
	}, \
	.capture = { \
	.channels_min = 2, \
	.channels_max = 2, \
	.rates = S3C_PCM_RATES, \
	.formats = SNDRV_PCM_FMTBIT_S16_LE, \
	}, \
	}

	struct snd_soc_dai s3c_pcm_dai[] = {
	S3C_PCM_DECLARE(0),
	S3C_PCM_DECLARE(1),
	};
	EXPORT_SYMBOL_GPL(s3c_pcm_dai);

	static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
	{
	struct s3c_pcm_info *pcm;
	struct snd_soc_dai *dai;
	struct resource mem_res, dmatx_res, *dmarx_res;
	struct s3c_audio_pdata *pcm_pdata;
	int ret;

	/* Check for valid device index */
	if ((pdev->id < 0) \|\| pdev->id >= ARRAY_SIZE(s3c_pcm)) {
	dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
	return -EINVAL;
	}

	pcm_pdata = pdev->dev.platform_data;

	/* Check for availability of necessary resource */
	dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dmatx_res) {
	dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
	return -ENXIO;
	}

	dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!dmarx_res) {
	dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
	return -ENXIO;
	}

	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem_res) {
	dev_err(&pdev->dev, "Unable to get register resource\n");
	return -ENXIO;
	}

	if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
	dev_err(&pdev->dev, "Unable to configure gpio\n");
	return -EINVAL;
	}

	pcm = &s3c_pcm[pdev->id];
	pcm->dev = &pdev->dev;

	spin_lock_init(&pcm->lock);

	dai = &s3c_pcm_dai[pdev->id];
	dai->dev = &pdev->dev;

	/* Default is 128fs */
	pcm->sclk_per_fs = 128;

	pcm->cclk = clk_get(&pdev->dev, "audio-bus");
	if (IS_ERR(pcm->cclk)) {
	dev_err(&pdev->dev, "failed to get audio-bus\n");
	ret = PTR_ERR(pcm->cclk);
	goto err1;
	}
	clk_enable(pcm->cclk);

	/* record our pcm structure for later use in the callbacks */
	dai->private_data = pcm;

	if (!request_mem_region(mem_res->start,
	resource_size(mem_res), "samsung-pcm")) {
	dev_err(&pdev->dev, "Unable to request register region\n");
	ret = -EBUSY;
	goto err2;
	}

	pcm->regs = ioremap(mem_res->start, 0x100);
	if (pcm->regs == NULL) {
	dev_err(&pdev->dev, "cannot ioremap registers\n");
	ret = -ENXIO;
	goto err3;
	}

	pcm->pclk = clk_get(&pdev->dev, "pcm");
	if (IS_ERR(pcm->pclk)) {
	dev_err(&pdev->dev, "failed to get pcm_clock\n");
	ret = -ENOENT;
	goto err4;
	}
	clk_enable(pcm->pclk);

	ret = snd_soc_register_dai(dai);
	if (ret != 0) {
	dev_err(&pdev->dev, "failed to get pcm_clock\n");
	goto err5;
	}

	s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
	+ S3C_PCM_RXFIFO;
	s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
	+ S3C_PCM_TXFIFO;

	s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
	s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;

	pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
	pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];

	return 0;

	err5:
	clk_disable(pcm->pclk);
	clk_put(pcm->pclk);
	err4:
	iounmap(pcm->regs);
	err3:
	release_mem_region(mem_res->start, resource_size(mem_res));
	err2:
	clk_disable(pcm->cclk);
	clk_put(pcm->cclk);
	err1:
	return ret;
	}

	static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
	{
	struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
	struct resource *mem_res;

	iounmap(pcm->regs);

	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	release_mem_region(mem_res->start, resource_size(mem_res));

	clk_disable(pcm->cclk);
	clk_disable(pcm->pclk);
	clk_put(pcm->pclk);
	clk_put(pcm->cclk);

	return 0;
	}

	static struct platform_driver s3c_pcm_driver = {
	.probe = s3c_pcm_dev_probe,
	.remove = s3c_pcm_dev_remove,
	.driver = {
	.name = "samsung-pcm",
	.owner = THIS_MODULE,
	},
	};

	static int __init s3c_pcm_init(void)
	{
	return platform_driver_register(&s3c_pcm_driver);
	}
	module_init(s3c_pcm_init);

	static void __exit s3c_pcm_exit(void)
	{
	platform_driver_unregister(&s3c_pcm_driver);
	}
	module_exit(s3c_pcm_exit);

	/* Module information */
	MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
	MODULE_DESCRIPTION("S3C PCM Controller Driver");
	MODULE_LICENSE("GPL");