[deliverable/linux.git] / sound / soc / s3c24xx / s3c-pcm.c

/* 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 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 = snd_soc_dai_get_drvdata(rtd->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 s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->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(rtd->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 = snd_soc_dai_get_drvdata(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 = snd_soc_dai_get_drvdata(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 = snd_soc_dai_get_drvdata(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_DAI_DECLARE			\
{								\
	.name		 = "samsung-dai",			\
	.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_driver s3c_pcm_dai[] = {
	S3C_PCM_DAI_DECLARE,
	S3C_PCM_DAI_DECLARE,
};
EXPORT_SYMBOL_GPL(s3c_pcm_dai);

static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
{
	struct s3c_pcm_info *pcm;
	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);

	/* 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 */
	dev_set_drvdata(&pdev->dev, 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(&pdev->dev, s3c_pcm_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;

	snd_soc_unregister_dai(&pdev->dev);

	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-audio",
		.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");
Commit	Line	Data
357a1db9 JB	1	/* sound/soc/s3c24xx/s3c-pcm.c
	2	*
	3	* ALSA SoC Audio Layer - S3C PCM-Controller driver
	4	*
	5	* Copyright (c) 2009 Samsung Electronics Co. Ltd
	6	* Author: Jaswinder Singh <jassi.brar@samsung.com>
	7	* based upon I2S drivers by Ben Dooks.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/module.h>
	16	#include <linux/device.h>
	17	#include <linux/delay.h>
	18	#include <linux/clk.h>
	19	#include <linux/kernel.h>
	20	#include <linux/gpio.h>
	21	#include <linux/io.h>
	22
	23	#include <sound/core.h>
	24	#include <sound/pcm.h>
	25	#include <sound/pcm_params.h>
	26	#include <sound/initval.h>
	27	#include <sound/soc.h>
	28
	29	#include <plat/audio.h>
	30	#include <plat/dma.h>
	31
	32	#include "s3c-dma.h"
	33	#include "s3c-pcm.h"
	34
	35	static struct s3c2410_dma_client s3c_pcm_dma_client_out = {
	36	.name = "PCM Stereo out"
	37	};
	38
	39	static struct s3c2410_dma_client s3c_pcm_dma_client_in = {
	40	.name = "PCM Stereo in"
	41	};
	42
	43	static struct s3c_dma_params s3c_pcm_stereo_out[] = {
	44	[0] = {
	45	.client = &s3c_pcm_dma_client_out,
	46	.dma_size = 4,
	47	},
	48	[1] = {
	49	.client = &s3c_pcm_dma_client_out,
	50	.dma_size = 4,
	51	},
	52	};
	53
	54	static struct s3c_dma_params s3c_pcm_stereo_in[] = {
	55	[0] = {
	56	.client = &s3c_pcm_dma_client_in,
	57	.dma_size = 4,
	58	},
	59	[1] = {
	60	.client = &s3c_pcm_dma_client_in,
	61	.dma_size = 4,
	62	},
	63	};
	64
65	static struct s3c_pcm_info s3c_pcm[2];
66
357a1db9 JB	67	static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
	68	{
	69	void __iomem *regs = pcm->regs;
	70	u32 ctl, clkctl;
	71
	72	clkctl = readl(regs + S3C_PCM_CLKCTL);
	73	ctl = readl(regs + S3C_PCM_CTL);
	74	ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
	75	<< S3C_PCM_CTL_TXDIPSTICK_SHIFT);
	76
	77	if (on) {
	78	ctl \|= S3C_PCM_CTL_TXDMA_EN;
	79	ctl \|= S3C_PCM_CTL_TXFIFO_EN;
	80	ctl \|= S3C_PCM_CTL_ENABLE;
	81	ctl \|= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
	82	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	83	} else {
	84	ctl &= ~S3C_PCM_CTL_TXDMA_EN;
	85	ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
	86
	87	if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
	88	ctl &= ~S3C_PCM_CTL_ENABLE;
	89	if (!pcm->idleclk)
	90	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	91	}
	92	}
	93
	94	writel(clkctl, regs + S3C_PCM_CLKCTL);
	95	writel(ctl, regs + S3C_PCM_CTL);
	96	}
	97
	98	static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
	99	{
	100	void __iomem *regs = pcm->regs;
	101	u32 ctl, clkctl;
	102
	103	ctl = readl(regs + S3C_PCM_CTL);
	104	clkctl = readl(regs + S3C_PCM_CLKCTL);
	105
	106	if (on) {
	107	ctl \|= S3C_PCM_CTL_RXDMA_EN;
	108	ctl \|= S3C_PCM_CTL_RXFIFO_EN;
	109	ctl \|= S3C_PCM_CTL_ENABLE;
	110	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	111	} else {
	112	ctl &= ~S3C_PCM_CTL_RXDMA_EN;
	113	ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
	114
	115	if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
	116	ctl &= ~S3C_PCM_CTL_ENABLE;
	117	if (!pcm->idleclk)
	118	clkctl \|= S3C_PCM_CLKCTL_SERCLK_EN;
	119	}
	120	}
	121
	122	writel(clkctl, regs + S3C_PCM_CLKCTL);
	123	writel(ctl, regs + S3C_PCM_CTL);
	124	}
	125
	126	static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
	127	struct snd_soc_dai *dai)
	128	{
	129	struct snd_soc_pcm_runtime *rtd = substream->private_data;
f0fba2ad	130	struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
357a1db9 JB	131	unsigned long flags;
	132
	133	dev_dbg(pcm->dev, "Entered %s\n", __func__);
	134
	135	switch (cmd) {
	136	case SNDRV_PCM_TRIGGER_START:
	137	case SNDRV_PCM_TRIGGER_RESUME:
	138	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	139	spin_lock_irqsave(&pcm->lock, flags);
	140
	141	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	142	s3c_pcm_snd_rxctrl(pcm, 1);
	143	else
	144	s3c_pcm_snd_txctrl(pcm, 1);
	145
	146	spin_unlock_irqrestore(&pcm->lock, flags);
	147	break;
	148
	149	case SNDRV_PCM_TRIGGER_STOP:
	150	case SNDRV_PCM_TRIGGER_SUSPEND:
	151	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	152	spin_lock_irqsave(&pcm->lock, flags);
	153
	154	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	155	s3c_pcm_snd_rxctrl(pcm, 0);
	156	else
	157	s3c_pcm_snd_txctrl(pcm, 0);
	158
	159	spin_unlock_irqrestore(&pcm->lock, flags);
	160	break;
	161
	162	default:
	163	return -EINVAL;
	164	}
	165
	166	return 0;
	167	}
	168
	169	static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
	170	struct snd_pcm_hw_params *params,
	171	struct snd_soc_dai *socdai)
	172	{
	173	struct snd_soc_pcm_runtime *rtd = substream->private_data;
f0fba2ad	174	struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
5f712b2b	175	struct s3c_dma_params *dma_data;
357a1db9 JB	176	void __iomem *regs = pcm->regs;
	177	struct clk *clk;
	178	int sclk_div, sync_div;
	179	unsigned long flags;
	180	u32 clkctl;
	181
	182	dev_dbg(pcm->dev, "Entered %s\n", __func__);
	183
	184	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
5f712b2b	185	dma_data = pcm->dma_playback;
357a1db9	186	else
5f712b2b DM	187	dma_data = pcm->dma_capture;
5f712b2b DM	188
f0fba2ad	189	snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
357a1db9 JB	190
	191	/* Strictly check for sample size */
	192	switch (params_format(params)) {
	193	case SNDRV_PCM_FORMAT_S16_LE:
	194	break;
	195	default:
	196	return -EINVAL;
	197	}
	198
	199	spin_lock_irqsave(&pcm->lock, flags);
	200
	201	/* Get hold of the PCMSOURCE_CLK */
	202	clkctl = readl(regs + S3C_PCM_CLKCTL);
	203	if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
	204	clk = pcm->pclk;
	205	else
	206	clk = pcm->cclk;
	207
	208	/* Set the SCLK divider */
	209	sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
	210	params_rate(params) / 2 - 1;
	211
	212	clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
	213	<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
	214	clkctl \|= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
	215	<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
	216
	217	/* Set the SYNC divider */
	218	sync_div = pcm->sclk_per_fs - 1;
	219
	220	clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
	221	<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
	222	clkctl \|= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
	223	<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
	224
	225	writel(clkctl, regs + S3C_PCM_CLKCTL);
	226
	227	spin_unlock_irqrestore(&pcm->lock, flags);
	228
59cdd9bc	229	dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
357a1db9 JB	230	clk_get_rate(clk), pcm->sclk_per_fs,
	231	sclk_div, sync_div);
	232
	233	return 0;
	234	}
	235
	236	static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
	237	unsigned int fmt)
	238	{
f0fba2ad	239	struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
357a1db9 JB	240	void __iomem *regs = pcm->regs;
	241	unsigned long flags;
	242	int ret = 0;
	243	u32 ctl;
	244
	245	dev_dbg(pcm->dev, "Entered %s\n", __func__);
	246
	247	spin_lock_irqsave(&pcm->lock, flags);
	248
	249	ctl = readl(regs + S3C_PCM_CTL);
	250
	251	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	252	case SND_SOC_DAIFMT_NB_NF:
	253	/* Nothing to do, NB_NF by default */
	254	break;
	255	default:
	256	dev_err(pcm->dev, "Unsupported clock inversion!\n");
	257	ret = -EINVAL;
	258	goto exit;
	259	}
	260
	261	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	262	case SND_SOC_DAIFMT_CBS_CFS:
	263	/* Nothing to do, Master by default */
	264	break;
	265	default:
	266	dev_err(pcm->dev, "Unsupported master/slave format!\n");
	267	ret = -EINVAL;
	268	goto exit;
	269	}
	270
	271	switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
	272	case SND_SOC_DAIFMT_CONT:
	273	pcm->idleclk = 1;
	274	break;
	275	case SND_SOC_DAIFMT_GATED:
	276	pcm->idleclk = 0;
	277	break;
	278	default:
	279	dev_err(pcm->dev, "Invalid Clock gating request!\n");
	280	ret = -EINVAL;
	281	goto exit;
	282	}
	283
	284	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	285	case SND_SOC_DAIFMT_DSP_A:
	286	ctl \|= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
	287	ctl \|= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
	288	break;
	289	case SND_SOC_DAIFMT_DSP_B:
	290	ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
	291	ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
	292	break;
	293	default:
	294	dev_err(pcm->dev, "Unsupported data format!\n");
	295	ret = -EINVAL;
	296	goto exit;
	297	}
	298
	299	writel(ctl, regs + S3C_PCM_CTL);
	300
	301	exit:
	302	spin_unlock_irqrestore(&pcm->lock, flags);
	303
304	return ret;
305	}
306
307	static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
308	int div_id, int div)
309	{
f0fba2ad	310	struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
357a1db9 JB	311
	312	switch (div_id) {
	313	case S3C_PCM_SCLK_PER_FS:
	314	pcm->sclk_per_fs = div;
	315	break;
	316
	317	default:
	318	return -EINVAL;
	319	}
	320
	321	return 0;
	322	}
	323
	324	static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
	325	int clk_id, unsigned int freq, int dir)
	326	{
f0fba2ad	327	struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
357a1db9 JB	328	void __iomem *regs = pcm->regs;
	329	u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
	330
	331	switch (clk_id) {
	332	case S3C_PCM_CLKSRC_PCLK:
	333	clkctl \|= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
	334	break;
	335
	336	case S3C_PCM_CLKSRC_MUX:
	337	clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
	338
	339	if (clk_get_rate(pcm->cclk) != freq)
	340	clk_set_rate(pcm->cclk, freq);
	341
	342	break;
	343
	344	default:
	345	return -EINVAL;
	346	}
	347
	348	writel(clkctl, regs + S3C_PCM_CLKCTL);
	349
	350	return 0;
	351	}
	352
	353	static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
	354	.set_sysclk = s3c_pcm_set_sysclk,
	355	.set_clkdiv = s3c_pcm_set_clkdiv,
	356	.trigger = s3c_pcm_trigger,
	357	.hw_params = s3c_pcm_hw_params,
	358	.set_fmt = s3c_pcm_set_fmt,
	359	};
	360
	361	#define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000
	362
f0fba2ad	363	#define S3C_PCM_DAI_DECLARE \
357a1db9	364	{ \
f0fba2ad	365	.name = "samsung-dai", \
357a1db9 JB	366	.symmetric_rates = 1, \
	367	.ops = &s3c_pcm_dai_ops, \
	368	.playback = { \
	369	.channels_min = 2, \
	370	.channels_max = 2, \
	371	.rates = S3C_PCM_RATES, \
	372	.formats = SNDRV_PCM_FMTBIT_S16_LE, \
	373	}, \
	374	.capture = { \
	375	.channels_min = 2, \
	376	.channels_max = 2, \
	377	.rates = S3C_PCM_RATES, \
	378	.formats = SNDRV_PCM_FMTBIT_S16_LE, \
	379	}, \
	380	}
	381
f0fba2ad LG	382	struct snd_soc_dai_driver s3c_pcm_dai[] = {
	383	S3C_PCM_DAI_DECLARE,
	384	S3C_PCM_DAI_DECLARE,
357a1db9 JB	385	};
	386	EXPORT_SYMBOL_GPL(s3c_pcm_dai);
	387
	388	static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
	389	{
	390	struct s3c_pcm_info *pcm;
357a1db9 JB	391	struct resource mem_res, dmatx_res, *dmarx_res;
	392	struct s3c_audio_pdata *pcm_pdata;
	393	int ret;
	394
	395	/* Check for valid device index */
	396	if ((pdev->id < 0) \|\| pdev->id >= ARRAY_SIZE(s3c_pcm)) {
	397	dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
	398	return -EINVAL;
	399	}
	400
	401	pcm_pdata = pdev->dev.platform_data;
	402
	403	/* Check for availability of necessary resource */
	404	dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	405	if (!dmatx_res) {
	406	dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
	407	return -ENXIO;
	408	}
	409
	410	dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	411	if (!dmarx_res) {
	412	dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
	413	return -ENXIO;
	414	}
	415
	416	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	417	if (!mem_res) {
	418	dev_err(&pdev->dev, "Unable to get register resource\n");
	419	return -ENXIO;
	420	}
	421
	422	if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
	423	dev_err(&pdev->dev, "Unable to configure gpio\n");
	424	return -EINVAL;
	425	}
	426
	427	pcm = &s3c_pcm[pdev->id];
	428	pcm->dev = &pdev->dev;
	429
	430	spin_lock_init(&pcm->lock);
	431
357a1db9 JB	432	/* Default is 128fs */
	433	pcm->sclk_per_fs = 128;
	434
	435	pcm->cclk = clk_get(&pdev->dev, "audio-bus");
	436	if (IS_ERR(pcm->cclk)) {
	437	dev_err(&pdev->dev, "failed to get audio-bus\n");
	438	ret = PTR_ERR(pcm->cclk);
	439	goto err1;
	440	}
	441	clk_enable(pcm->cclk);
	442
	443	/* record our pcm structure for later use in the callbacks */
f0fba2ad	444	dev_set_drvdata(&pdev->dev, pcm);
357a1db9 JB	445
	446	if (!request_mem_region(mem_res->start,
	447	resource_size(mem_res), "samsung-pcm")) {
	448	dev_err(&pdev->dev, "Unable to request register region\n");
	449	ret = -EBUSY;
	450	goto err2;
	451	}
	452
	453	pcm->regs = ioremap(mem_res->start, 0x100);
	454	if (pcm->regs == NULL) {
	455	dev_err(&pdev->dev, "cannot ioremap registers\n");
	456	ret = -ENXIO;
	457	goto err3;
	458	}
	459
	460	pcm->pclk = clk_get(&pdev->dev, "pcm");
	461	if (IS_ERR(pcm->pclk)) {
	462	dev_err(&pdev->dev, "failed to get pcm_clock\n");
	463	ret = -ENOENT;
	464	goto err4;
	465	}
	466	clk_enable(pcm->pclk);
	467
f0fba2ad	468	ret = snd_soc_register_dai(&pdev->dev, s3c_pcm_dai);
357a1db9 JB	469	if (ret != 0) {
	470	dev_err(&pdev->dev, "failed to get pcm_clock\n");
	471	goto err5;
	472	}
	473
	474	s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
	475	+ S3C_PCM_RXFIFO;
	476	s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
	477	+ S3C_PCM_TXFIFO;
	478
	479	s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
	480	s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;
	481
	482	pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
	483	pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
	484
	485	return 0;
	486
	487	err5:
	488	clk_disable(pcm->pclk);
	489	clk_put(pcm->pclk);
	490	err4:
	491	iounmap(pcm->regs);
	492	err3:
	493	release_mem_region(mem_res->start, resource_size(mem_res));
	494	err2:
	495	clk_disable(pcm->cclk);
	496	clk_put(pcm->cclk);
	497	err1:
	498	return ret;
	499	}
	500
	501	static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
	502	{
	503	struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
	504	struct resource *mem_res;
	505
f0fba2ad LG	506	snd_soc_unregister_dai(&pdev->dev);
f0fba2ad LG	507
357a1db9 JB	508	iounmap(pcm->regs);
	509
	510	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	511	release_mem_region(mem_res->start, resource_size(mem_res));
	512
	513	clk_disable(pcm->cclk);
	514	clk_disable(pcm->pclk);
	515	clk_put(pcm->pclk);
	516	clk_put(pcm->cclk);
	517
	518	return 0;
	519	}
	520
	521	static struct platform_driver s3c_pcm_driver = {
	522	.probe = s3c_pcm_dev_probe,
	523	.remove = s3c_pcm_dev_remove,
	524	.driver = {
f0fba2ad	525	.name = "samsung-pcm-audio",
357a1db9 JB	526	.owner = THIS_MODULE,
	527	},
	528	};
	529
	530	static int __init s3c_pcm_init(void)
	531	{
	532	return platform_driver_register(&s3c_pcm_driver);
	533	}
	534	module_init(s3c_pcm_init);
	535
	536	static void __exit s3c_pcm_exit(void)
	537	{
	538	platform_driver_unregister(&s3c_pcm_driver);
	539	}
	540	module_exit(s3c_pcm_exit);
	541
	542	/* Module information */
	543	MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
	544	MODULE_DESCRIPTION("S3C PCM Controller Driver");
	545	MODULE_LICENSE("GPL");