[mirror_ubuntu-bionic-kernel.git] / sound / soc / samsung / spdif.c

/* sound/soc/samsung/spdif.c
 *
 * ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
 *
 * Copyright (c) 2010 Samsung Electronics Co. Ltd
 *		http://www.samsung.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/clk.h>
#include <linux/io.h>

#include <sound/soc.h>
#include <sound/pcm_params.h>

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

#include "dma.h"
#include "spdif.h"

/* Registers */
#define CLKCON				0x00
#define CON				0x04
#define BSTAS				0x08
#define CSTAS				0x0C
#define DATA_OUTBUF			0x10
#define DCNT				0x14
#define BSTAS_S				0x18
#define DCNT_S				0x1C

#define CLKCTL_MASK			0x7
#define CLKCTL_MCLK_EXT			(0x1 << 2)
#define CLKCTL_PWR_ON			(0x1 << 0)

#define CON_MASK			0x3ffffff
#define CON_FIFO_TH_SHIFT		19
#define CON_FIFO_TH_MASK		(0x7 << 19)
#define CON_USERDATA_23RDBIT		(0x1 << 12)

#define CON_SW_RESET			(0x1 << 5)

#define CON_MCLKDIV_MASK		(0x3 << 3)
#define CON_MCLKDIV_256FS		(0x0 << 3)
#define CON_MCLKDIV_384FS		(0x1 << 3)
#define CON_MCLKDIV_512FS		(0x2 << 3)

#define CON_PCM_MASK			(0x3 << 1)
#define CON_PCM_16BIT			(0x0 << 1)
#define CON_PCM_20BIT			(0x1 << 1)
#define CON_PCM_24BIT			(0x2 << 1)

#define CON_PCM_DATA			(0x1 << 0)

#define CSTAS_MASK			0x3fffffff
#define CSTAS_SAMP_FREQ_MASK		(0xF << 24)
#define CSTAS_SAMP_FREQ_44		(0x0 << 24)
#define CSTAS_SAMP_FREQ_48		(0x2 << 24)
#define CSTAS_SAMP_FREQ_32		(0x3 << 24)
#define CSTAS_SAMP_FREQ_96		(0xA << 24)

#define CSTAS_CATEGORY_MASK		(0xFF << 8)
#define CSTAS_CATEGORY_CODE_CDP		(0x01 << 8)

#define CSTAS_NO_COPYRIGHT		(0x1 << 2)

/**
 * struct samsung_spdif_info - Samsung S/PDIF Controller information
 * @lock: Spin lock for S/PDIF.
 * @dev: The parent device passed to use from the probe.
 * @regs: The pointer to the device register block.
 * @clk_rate: Current clock rate for calcurate ratio.
 * @pclk: The peri-clock pointer for spdif master operation.
 * @sclk: The source clock pointer for making sync signals.
 * @save_clkcon: Backup clkcon reg. in suspend.
 * @save_con: Backup con reg. in suspend.
 * @save_cstas: Backup cstas reg. in suspend.
 * @dma_playback: DMA information for playback channel.
 */
struct samsung_spdif_info {
	spinlock_t	lock;
	struct device	*dev;
	void __iomem	*regs;
	unsigned long	clk_rate;
	struct clk	*pclk;
	struct clk	*sclk;
	u32		saved_clkcon;
	u32		saved_con;
	u32		saved_cstas;
	struct s3c_dma_params	*dma_playback;
};

static struct s3c2410_dma_client spdif_dma_client_out = {
	.name		= "S/PDIF Stereo out",
};

static struct s3c_dma_params spdif_stereo_out;
static struct samsung_spdif_info spdif_info;

static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
{
	return snd_soc_dai_get_drvdata(cpu_dai);
}

static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
{
	void __iomem *regs = spdif->regs;
	u32 clkcon;

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

	clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
	if (on)
		writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
	else
		writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
}

static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
				int clk_id, unsigned int freq, int dir)
{
	struct samsung_spdif_info *spdif = to_info(cpu_dai);
	u32 clkcon;

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

	clkcon = readl(spdif->regs + CLKCON);

	if (clk_id == SND_SOC_SPDIF_INT_MCLK)
		clkcon &= ~CLKCTL_MCLK_EXT;
	else
		clkcon |= CLKCTL_MCLK_EXT;

	writel(clkcon, spdif->regs + CLKCON);

	spdif->clk_rate = freq;

	return 0;
}

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

	dev_dbg(spdif->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(&spdif->lock, flags);
		spdif_snd_txctrl(spdif, 1);
		spin_unlock_irqrestore(&spdif->lock, flags);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		spin_lock_irqsave(&spdif->lock, flags);
		spdif_snd_txctrl(spdif, 0);
		spin_unlock_irqrestore(&spdif->lock, flags);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int spdif_sysclk_ratios[] = {
	512, 384, 256,
};

static int spdif_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 samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
	void __iomem *regs = spdif->regs;
	struct s3c_dma_params *dma_data;
	u32 con, clkcon, cstas;
	unsigned long flags;
	int i, ratio;

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

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dma_data = spdif->dma_playback;
	else {
		dev_err(spdif->dev, "Capture is not supported\n");
		return -EINVAL;
	}

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

	spin_lock_irqsave(&spdif->lock, flags);

	con = readl(regs + CON) & CON_MASK;
	cstas = readl(regs + CSTAS) & CSTAS_MASK;
	clkcon = readl(regs + CLKCON) & CLKCTL_MASK;

	con &= ~CON_FIFO_TH_MASK;
	con |= (0x7 << CON_FIFO_TH_SHIFT);
	con |= CON_USERDATA_23RDBIT;
	con |= CON_PCM_DATA;

	con &= ~CON_PCM_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		con |= CON_PCM_16BIT;
		break;
	default:
		dev_err(spdif->dev, "Unsupported data size.\n");
		goto err;
	}

	ratio = spdif->clk_rate / params_rate(params);
	for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
		if (ratio == spdif_sysclk_ratios[i])
			break;
	if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
		dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
				spdif->clk_rate, params_rate(params));
		goto err;
	}

	con &= ~CON_MCLKDIV_MASK;
	switch (ratio) {
	case 256:
		con |= CON_MCLKDIV_256FS;
		break;
	case 384:
		con |= CON_MCLKDIV_384FS;
		break;
	case 512:
		con |= CON_MCLKDIV_512FS;
		break;
	}

	cstas &= ~CSTAS_SAMP_FREQ_MASK;
	switch (params_rate(params)) {
	case 44100:
		cstas |= CSTAS_SAMP_FREQ_44;
		break;
	case 48000:
		cstas |= CSTAS_SAMP_FREQ_48;
		break;
	case 32000:
		cstas |= CSTAS_SAMP_FREQ_32;
		break;
	case 96000:
		cstas |= CSTAS_SAMP_FREQ_96;
		break;
	default:
		dev_err(spdif->dev, "Invalid sampling rate %d\n",
				params_rate(params));
		goto err;
	}

	cstas &= ~CSTAS_CATEGORY_MASK;
	cstas |= CSTAS_CATEGORY_CODE_CDP;
	cstas |= CSTAS_NO_COPYRIGHT;

	writel(con, regs + CON);
	writel(cstas, regs + CSTAS);
	writel(clkcon, regs + CLKCON);

	spin_unlock_irqrestore(&spdif->lock, flags);

	return 0;
err:
	spin_unlock_irqrestore(&spdif->lock, flags);
	return -EINVAL;
}

static void spdif_shutdown(struct snd_pcm_substream *substream,
				struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
	void __iomem *regs = spdif->regs;
	u32 con, clkcon;

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

	con = readl(regs + CON) & CON_MASK;
	clkcon = readl(regs + CLKCON) & CLKCTL_MASK;

	writel(con | CON_SW_RESET, regs + CON);
	cpu_relax();

	writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
}

#ifdef CONFIG_PM
static int spdif_suspend(struct snd_soc_dai *cpu_dai)
{
	struct samsung_spdif_info *spdif = to_info(cpu_dai);
	u32 con = spdif->saved_con;

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

	spdif->saved_clkcon = readl(spdif->regs	+ CLKCON) & CLKCTL_MASK;
	spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
	spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;

	writel(con | CON_SW_RESET, spdif->regs + CON);
	cpu_relax();

	return 0;
}

static int spdif_resume(struct snd_soc_dai *cpu_dai)
{
	struct samsung_spdif_info *spdif = to_info(cpu_dai);

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

	writel(spdif->saved_clkcon, spdif->regs	+ CLKCON);
	writel(spdif->saved_con, spdif->regs + CON);
	writel(spdif->saved_cstas, spdif->regs + CSTAS);

	return 0;
}
#else
#define spdif_suspend NULL
#define spdif_resume NULL
#endif

static struct snd_soc_dai_ops spdif_dai_ops = {
	.set_sysclk	= spdif_set_sysclk,
	.trigger	= spdif_trigger,
	.hw_params	= spdif_hw_params,
	.shutdown	= spdif_shutdown,
};

struct snd_soc_dai_driver samsung_spdif_dai = {
	.name = "samsung-spdif",
	.playback = {
		.stream_name = "S/PDIF Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = (SNDRV_PCM_RATE_32000 |
				SNDRV_PCM_RATE_44100 |
				SNDRV_PCM_RATE_48000 |
				SNDRV_PCM_RATE_96000),
		.formats = SNDRV_PCM_FMTBIT_S16_LE, },
	.ops = &spdif_dai_ops,
	.suspend = spdif_suspend,
	.resume = spdif_resume,
};

static __devinit int spdif_probe(struct platform_device *pdev)
{
	struct s3c_audio_pdata *spdif_pdata;
	struct resource *mem_res, *dma_res;
	struct samsung_spdif_info *spdif;
	int ret;

	spdif_pdata = pdev->dev.platform_data;

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

	dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dma_res) {
		dev_err(&pdev->dev, "Unable to get 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 (spdif_pdata && spdif_pdata->cfg_gpio
			&& spdif_pdata->cfg_gpio(pdev)) {
		dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
		return -EINVAL;
	}

	spdif = &spdif_info;
	spdif->dev = &pdev->dev;

	spin_lock_init(&spdif->lock);

	spdif->pclk = clk_get(&pdev->dev, "spdif");
	if (IS_ERR(spdif->pclk)) {
		dev_err(&pdev->dev, "failed to get peri-clock\n");
		ret = -ENOENT;
		goto err0;
	}
	clk_enable(spdif->pclk);

	spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
	if (IS_ERR(spdif->sclk)) {
		dev_err(&pdev->dev, "failed to get internal source clock\n");
		ret = -ENOENT;
		goto err1;
	}
	clk_enable(spdif->sclk);

	/* Request S/PDIF Register's memory region */
	if (!request_mem_region(mem_res->start,
				resource_size(mem_res), "samsung-spdif")) {
		dev_err(&pdev->dev, "Unable to request register region\n");
		ret = -EBUSY;
		goto err2;
	}

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

	dev_set_drvdata(&pdev->dev, spdif);

	ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
	if (ret != 0) {
		dev_err(&pdev->dev, "fail to register dai\n");
		goto err4;
	}

	spdif_stereo_out.dma_size = 2;
	spdif_stereo_out.client = &spdif_dma_client_out;
	spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
	spdif_stereo_out.channel = dma_res->start;

	spdif->dma_playback = &spdif_stereo_out;

	return 0;

err4:
	iounmap(spdif->regs);
err3:
	release_mem_region(mem_res->start, resource_size(mem_res));
err2:
	clk_disable(spdif->sclk);
	clk_put(spdif->sclk);
err1:
	clk_disable(spdif->pclk);
	clk_put(spdif->pclk);
err0:
	return ret;
}

static __devexit int spdif_remove(struct platform_device *pdev)
{
	struct samsung_spdif_info *spdif = &spdif_info;
	struct resource *mem_res;

	snd_soc_unregister_dai(&pdev->dev);

	iounmap(spdif->regs);

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

	clk_disable(spdif->sclk);
	clk_put(spdif->sclk);
	clk_disable(spdif->pclk);
	clk_put(spdif->pclk);

	return 0;
}

static struct platform_driver samsung_spdif_driver = {
	.probe	= spdif_probe,
	.remove	= spdif_remove,
	.driver	= {
		.name	= "samsung-spdif",
		.owner	= THIS_MODULE,
	},
};

static int __init spdif_init(void)
{
	return platform_driver_register(&samsung_spdif_driver);
}
module_init(spdif_init);

static void __exit spdif_exit(void)
{
	platform_driver_unregister(&samsung_spdif_driver);
}
module_exit(spdif_exit);

MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-spdif");
Commit	Line	Data
5033f43c	1	/* sound/soc/samsung/spdif.c
fc127ccc SY	2	*
	3	* ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
	4	*
	5	* Copyright (c) 2010 Samsung Electronics Co. Ltd
	6	* http://www.samsung.com/
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/clk.h>
	14	#include <linux/io.h>
	15
fc127ccc	16	#include <sound/soc.h>
0378b6ac	17	#include <sound/pcm_params.h>
fc127ccc SY	18
	19	#include <plat/audio.h>
	20	#include <mach/dma.h>
	21
4b640cf3	22	#include "dma.h"
fc127ccc SY	23	#include "spdif.h"
	24
	25	/* Registers */
	26	#define CLKCON 0x00
	27	#define CON 0x04
	28	#define BSTAS 0x08
	29	#define CSTAS 0x0C
	30	#define DATA_OUTBUF 0x10
	31	#define DCNT 0x14
	32	#define BSTAS_S 0x18
	33	#define DCNT_S 0x1C
	34
	35	#define CLKCTL_MASK 0x7
	36	#define CLKCTL_MCLK_EXT (0x1 << 2)
	37	#define CLKCTL_PWR_ON (0x1 << 0)
	38
	39	#define CON_MASK 0x3ffffff
	40	#define CON_FIFO_TH_SHIFT 19
	41	#define CON_FIFO_TH_MASK (0x7 << 19)
	42	#define CON_USERDATA_23RDBIT (0x1 << 12)
	43
	44	#define CON_SW_RESET (0x1 << 5)
	45
	46	#define CON_MCLKDIV_MASK (0x3 << 3)
	47	#define CON_MCLKDIV_256FS (0x0 << 3)
	48	#define CON_MCLKDIV_384FS (0x1 << 3)
	49	#define CON_MCLKDIV_512FS (0x2 << 3)
	50
	51	#define CON_PCM_MASK (0x3 << 1)
	52	#define CON_PCM_16BIT (0x0 << 1)
	53	#define CON_PCM_20BIT (0x1 << 1)
	54	#define CON_PCM_24BIT (0x2 << 1)
	55
	56	#define CON_PCM_DATA (0x1 << 0)
	57
	58	#define CSTAS_MASK 0x3fffffff
	59	#define CSTAS_SAMP_FREQ_MASK (0xF << 24)
	60	#define CSTAS_SAMP_FREQ_44 (0x0 << 24)
	61	#define CSTAS_SAMP_FREQ_48 (0x2 << 24)
	62	#define CSTAS_SAMP_FREQ_32 (0x3 << 24)
	63	#define CSTAS_SAMP_FREQ_96 (0xA << 24)
	64
	65	#define CSTAS_CATEGORY_MASK (0xFF << 8)
	66	#define CSTAS_CATEGORY_CODE_CDP (0x01 << 8)
	67
	68	#define CSTAS_NO_COPYRIGHT (0x1 << 2)
	69
	70	/**
	71	* struct samsung_spdif_info - Samsung S/PDIF Controller information
	72	* @lock: Spin lock for S/PDIF.
	73	* @dev: The parent device passed to use from the probe.
	74	* @regs: The pointer to the device register block.
	75	* @clk_rate: Current clock rate for calcurate ratio.
	76	* @pclk: The peri-clock pointer for spdif master operation.
	77	* @sclk: The source clock pointer for making sync signals.
	78	* @save_clkcon: Backup clkcon reg. in suspend.
	79	* @save_con: Backup con reg. in suspend.
	80	* @save_cstas: Backup cstas reg. in suspend.
	81	* @dma_playback: DMA information for playback channel.
	82	*/
	83	struct samsung_spdif_info {
	84	spinlock_t lock;
	85	struct device *dev;
	86	void __iomem *regs;
87	unsigned long clk_rate;
88	struct clk *pclk;
89	struct clk *sclk;
90	u32 saved_clkcon;
91	u32 saved_con;
92	u32 saved_cstas;
93	struct s3c_dma_params *dma_playback;
94	};
95
96	static struct s3c2410_dma_client spdif_dma_client_out = {
97	.name = "S/PDIF Stereo out",
98	};
99
100	static struct s3c_dma_params spdif_stereo_out;
101	static struct samsung_spdif_info spdif_info;
102
103	static inline struct samsung_spdif_info to_info(struct snd_soc_dai cpu_dai)
104	{
105	return snd_soc_dai_get_drvdata(cpu_dai);
106	}
107
108	static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
109	{
110	void __iomem *regs = spdif->regs;
111	u32 clkcon;
112
113	dev_dbg(spdif->dev, "Entered %s\n", __func__);
114
115	clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
116	if (on)
117	writel(clkcon \| CLKCTL_PWR_ON, regs + CLKCON);
118	else
119	writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
120	}
121
122	static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
123	int clk_id, unsigned int freq, int dir)
124	{
125	struct samsung_spdif_info *spdif = to_info(cpu_dai);
126	u32 clkcon;
127
128	dev_dbg(spdif->dev, "Entered %s\n", __func__);
129
130	clkcon = readl(spdif->regs + CLKCON);
131
132	if (clk_id == SND_SOC_SPDIF_INT_MCLK)
133	clkcon &= ~CLKCTL_MCLK_EXT;
134	else
135	clkcon \|= CLKCTL_MCLK_EXT;
136
137	writel(clkcon, spdif->regs + CLKCON);
138
139	spdif->clk_rate = freq;
140
141	return 0;
142	}
143
144	static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
145	struct snd_soc_dai *dai)
146	{
147	struct snd_soc_pcm_runtime *rtd = substream->private_data;
148	struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
149	unsigned long flags;
150
151	dev_dbg(spdif->dev, "Entered %s\n", __func__);
152
153	switch (cmd) {
154	case SNDRV_PCM_TRIGGER_START:
155	case SNDRV_PCM_TRIGGER_RESUME:
156	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
157	spin_lock_irqsave(&spdif->lock, flags);
158	spdif_snd_txctrl(spdif, 1);
159	spin_unlock_irqrestore(&spdif->lock, flags);
160	break;
161	case SNDRV_PCM_TRIGGER_STOP:
162	case SNDRV_PCM_TRIGGER_SUSPEND:
163	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
164	spin_lock_irqsave(&spdif->lock, flags);
165	spdif_snd_txctrl(spdif, 0);
166	spin_unlock_irqrestore(&spdif->lock, flags);
167	break;
168	default:
169	return -EINVAL;
170	}
171
172	return 0;
173	}
174
175	static int spdif_sysclk_ratios[] = {
176	512, 384, 256,
177	};
178
179	static int spdif_hw_params(struct snd_pcm_substream *substream,
180	struct snd_pcm_hw_params *params,
181	struct snd_soc_dai *socdai)
182	{
183	struct snd_soc_pcm_runtime *rtd = substream->private_data;
184	struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
185	void __iomem *regs = spdif->regs;
186	struct s3c_dma_params *dma_data;
187	u32 con, clkcon, cstas;
188	unsigned long flags;
189	int i, ratio;
190
191	dev_dbg(spdif->dev, "Entered %s\n", __func__);
192
193	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
194	dma_data = spdif->dma_playback;
195	else {
196	dev_err(spdif->dev, "Capture is not supported\n");
197	return -EINVAL;
198	}
199
200	snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
201
202	spin_lock_irqsave(&spdif->lock, flags);
203
204	con = readl(regs + CON) & CON_MASK;
205	cstas = readl(regs + CSTAS) & CSTAS_MASK;
206	clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
207
208	con &= ~CON_FIFO_TH_MASK;
209	con \|= (0x7 << CON_FIFO_TH_SHIFT);
210	con \|= CON_USERDATA_23RDBIT;
211	con \|= CON_PCM_DATA;
212
213	con &= ~CON_PCM_MASK;
214	switch (params_format(params)) {
215	case SNDRV_PCM_FORMAT_S16_LE:
216	con \|= CON_PCM_16BIT;
217	break;
218	default:
219	dev_err(spdif->dev, "Unsupported data size.\n");
220	goto err;
221	}
222
223	ratio = spdif->clk_rate / params_rate(params);
224	for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
225	if (ratio == spdif_sysclk_ratios[i])
226	break;
227	if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
228	dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
229	spdif->clk_rate, params_rate(params));
230	goto err;
231	}
232
233	con &= ~CON_MCLKDIV_MASK;
234	switch (ratio) {
235	case 256:
236	con \|= CON_MCLKDIV_256FS;
237	break;
238	case 384:
239	con \|= CON_MCLKDIV_384FS;
240	break;
241	case 512:
242	con \|= CON_MCLKDIV_512FS;
243	break;
244	}
245
246	cstas &= ~CSTAS_SAMP_FREQ_MASK;
247	switch (params_rate(params)) {
248	case 44100:
249	cstas \|= CSTAS_SAMP_FREQ_44;
250	break;
251	case 48000:
252	cstas \|= CSTAS_SAMP_FREQ_48;
253	break;
254	case 32000:
255	cstas \|= CSTAS_SAMP_FREQ_32;
256	break;
257	case 96000:
258	cstas \|= CSTAS_SAMP_FREQ_96;
259	break;
260	default:
261	dev_err(spdif->dev, "Invalid sampling rate %d\n",
262	params_rate(params));
263	goto err;
264	}
265
266	cstas &= ~CSTAS_CATEGORY_MASK;
267	cstas \|= CSTAS_CATEGORY_CODE_CDP;
268	cstas \|= CSTAS_NO_COPYRIGHT;
269
270	writel(con, regs + CON);
271	writel(cstas, regs + CSTAS);
272	writel(clkcon, regs + CLKCON);
273
274	spin_unlock_irqrestore(&spdif->lock, flags);
275
276	return 0;
277	err:
278	spin_unlock_irqrestore(&spdif->lock, flags);
279	return -EINVAL;
280	}
281
282	static void spdif_shutdown(struct snd_pcm_substream *substream,
283	struct snd_soc_dai *dai)
284	{
285	struct snd_soc_pcm_runtime *rtd = substream->private_data;
286	struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
287	void __iomem *regs = spdif->regs;
288	u32 con, clkcon;
289
290	dev_dbg(spdif->dev, "Entered %s\n", __func__);
291
292	con = readl(regs + CON) & CON_MASK;
293	clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
294
295	writel(con \| CON_SW_RESET, regs + CON);
296	cpu_relax();
297
298	writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
299	}
300
301	#ifdef CONFIG_PM
302	static int spdif_suspend(struct snd_soc_dai *cpu_dai)
303	{
304	struct samsung_spdif_info *spdif = to_info(cpu_dai);
305	u32 con = spdif->saved_con;
306
307	dev_dbg(spdif->dev, "Entered %s\n", __func__);
308
309	spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
310	spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
311	spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
312
313	writel(con \| CON_SW_RESET, spdif->regs + CON);
314	cpu_relax();
315
316	return 0;
317	}
318
319	static int spdif_resume(struct snd_soc_dai *cpu_dai)
320	{
321	struct samsung_spdif_info *spdif = to_info(cpu_dai);
322
323	dev_dbg(spdif->dev, "Entered %s\n", __func__);
324
325	writel(spdif->saved_clkcon, spdif->regs + CLKCON);
326	writel(spdif->saved_con, spdif->regs + CON);
327	writel(spdif->saved_cstas, spdif->regs + CSTAS);
328
329	return 0;
330	}
331	#else
332	#define spdif_suspend NULL
333	#define spdif_resume NULL
334	#endif
335
336	static struct snd_soc_dai_ops spdif_dai_ops = {
337	.set_sysclk = spdif_set_sysclk,
338	.trigger = spdif_trigger,
339	.hw_params = spdif_hw_params,
340	.shutdown = spdif_shutdown,
341	};
342
343	struct snd_soc_dai_driver samsung_spdif_dai = {
344	.name = "samsung-spdif",
345	.playback = {
346	.stream_name = "S/PDIF Playback",
347	.channels_min = 2,
348	.channels_max = 2,
349	.rates = (SNDRV_PCM_RATE_32000 \|
350	SNDRV_PCM_RATE_44100 \|
351	SNDRV_PCM_RATE_48000 \|
352	SNDRV_PCM_RATE_96000),
353	.formats = SNDRV_PCM_FMTBIT_S16_LE, },
354	.ops = &spdif_dai_ops,
355	.suspend = spdif_suspend,
356	.resume = spdif_resume,
357	};
358
359	static __devinit int spdif_probe(struct platform_device *pdev)
360	{
361	struct s3c_audio_pdata *spdif_pdata;
362	struct resource mem_res, dma_res;
363	struct samsung_spdif_info *spdif;
364	int ret;
365
366	spdif_pdata = pdev->dev.platform_data;
367
368	dev_dbg(&pdev->dev, "Entered %s\n", __func__);
369
370	dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
371	if (!dma_res) {
372	dev_err(&pdev->dev, "Unable to get dma resource.\n");
373	return -ENXIO;
374	}
375
376	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
377	if (!mem_res) {
378	dev_err(&pdev->dev, "Unable to get register resource.\n");
379	return -ENXIO;
380	}
381
382	if (spdif_pdata && spdif_pdata->cfg_gpio
383	&& spdif_pdata->cfg_gpio(pdev)) {
384	dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
385	return -EINVAL;
386	}
387
388	spdif = &spdif_info;
389	spdif->dev = &pdev->dev;
390
391	spin_lock_init(&spdif->lock);
392
393	spdif->pclk = clk_get(&pdev->dev, "spdif");
394	if (IS_ERR(spdif->pclk)) {
395	dev_err(&pdev->dev, "failed to get peri-clock\n");
396	ret = -ENOENT;
397	goto err0;
398	}
399	clk_enable(spdif->pclk);
400
401	spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
402	if (IS_ERR(spdif->sclk)) {
403	dev_err(&pdev->dev, "failed to get internal source clock\n");
404	ret = -ENOENT;
405	goto err1;
406	}
407	clk_enable(spdif->sclk);
408
409	/* Request S/PDIF Register's memory region */
410	if (!request_mem_region(mem_res->start,
411	resource_size(mem_res), "samsung-spdif")) {
412	dev_err(&pdev->dev, "Unable to request register region\n");
413	ret = -EBUSY;
414	goto err2;
415	}
416
417	spdif->regs = ioremap(mem_res->start, 0x100);
418	if (spdif->regs == NULL) {
419	dev_err(&pdev->dev, "Cannot ioremap registers\n");
420	ret = -ENXIO;
421	goto err3;
422	}
423
424	dev_set_drvdata(&pdev->dev, spdif);
425
426	ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
427	if (ret != 0) {
428	dev_err(&pdev->dev, "fail to register dai\n");
429	goto err4;
430	}
431
432	spdif_stereo_out.dma_size = 2;
433	spdif_stereo_out.client = &spdif_dma_client_out;
434	spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
435	spdif_stereo_out.channel = dma_res->start;
436
437	spdif->dma_playback = &spdif_stereo_out;
438
439	return 0;
440
441	err4:
442	iounmap(spdif->regs);
443	err3:
444	release_mem_region(mem_res->start, resource_size(mem_res));
445	err2:
446	clk_disable(spdif->sclk);
447	clk_put(spdif->sclk);
448	err1:
449	clk_disable(spdif->pclk);
450	clk_put(spdif->pclk);
451	err0:
452	return ret;
453	}
454
455	static __devexit int spdif_remove(struct platform_device *pdev)
456	{
457	struct samsung_spdif_info *spdif = &spdif_info;
458	struct resource *mem_res;
459
460	snd_soc_unregister_dai(&pdev->dev);
461
462	iounmap(spdif->regs);
463
464	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
465	if (mem_res)
466	release_mem_region(mem_res->start, resource_size(mem_res));
467
468	clk_disable(spdif->sclk);
469	clk_put(spdif->sclk);
470	clk_disable(spdif->pclk);
471	clk_put(spdif->pclk);
472
473	return 0;
474	}
475
476	static struct platform_driver samsung_spdif_driver = {
477	.probe = spdif_probe,
478	.remove = spdif_remove,
479	.driver = {
480	.name = "samsung-spdif",
481	.owner = THIS_MODULE,
482	},
483	};
484
485	static int __init spdif_init(void)
486	{
487	return platform_driver_register(&samsung_spdif_driver);
488	}
489	module_init(spdif_init);
490
491	static void __exit spdif_exit(void)
492	{
493	platform_driver_unregister(&samsung_spdif_driver);
494	}
495	module_exit(spdif_exit);
496
497	MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
498	MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
499	MODULE_LICENSE("GPL");
500	MODULE_ALIAS("platform:samsung-spdif");