[mirror_ubuntu-hirsute-kernel.git] / sound / soc / s3c24xx / s3c24xx-i2s.c

/*
 * s3c24xx-i2s.c  --  ALSA Soc Audio Layer
 *
 * (c) 2006 Wolfson Microelectronics PLC.
 * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
 *
 * Copyright 2004-2005 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 *  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/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/jiffies.h>
#include <linux/io.h>
#include <linux/gpio.h>

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

#include <mach/hardware.h>
#include <mach/regs-gpio.h>
#include <mach/regs-clock.h>
#include <plat/audio.h>
#include <asm/dma.h>
#include <mach/dma.h>

#include <plat/regs-iis.h>

#include "s3c24xx-pcm.h"
#include "s3c24xx-i2s.h"

static struct s3c2410_dma_client s3c24xx_dma_client_out = {
	.name = "I2S PCM Stereo out"
};

static struct s3c2410_dma_client s3c24xx_dma_client_in = {
	.name = "I2S PCM Stereo in"
};

static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out = {
	.client		= &s3c24xx_dma_client_out,
	.channel	= DMACH_I2S_OUT,
	.dma_addr	= S3C2410_PA_IIS + S3C2410_IISFIFO,
	.dma_size	= 2,
};

static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = {
	.client		= &s3c24xx_dma_client_in,
	.channel	= DMACH_I2S_IN,
	.dma_addr	= S3C2410_PA_IIS + S3C2410_IISFIFO,
	.dma_size	= 2,
};

struct s3c24xx_i2s_info {
	void __iomem	*regs;
	struct clk	*iis_clk;
	u32		iiscon;
	u32		iismod;
	u32		iisfcon;
	u32		iispsr;
};
static struct s3c24xx_i2s_info s3c24xx_i2s;

static void s3c24xx_snd_txctrl(int on)
{
	u32 iisfcon;
	u32 iiscon;
	u32 iismod;

	pr_debug("Entered %s\n", __func__);

	iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
	iiscon  = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	iismod  = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);

	pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);

	if (on) {
		iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
		iiscon  |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
		iiscon  &= ~S3C2410_IISCON_TXIDLE;
		iismod  |= S3C2410_IISMOD_TXMODE;

		writel(iismod,  s3c24xx_i2s.regs + S3C2410_IISMOD);
		writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
		writel(iiscon,  s3c24xx_i2s.regs + S3C2410_IISCON);
	} else {
		/* note, we have to disable the FIFOs otherwise bad things
		 * seem to happen when the DMA stops. According to the
		 * Samsung supplied kernel, this should allow the DMA
		 * engine and FIFOs to reset. If this isn't allowed, the
		 * DMA engine will simply freeze randomly.
		 */

		iisfcon &= ~S3C2410_IISFCON_TXENABLE;
		iisfcon &= ~S3C2410_IISFCON_TXDMA;
		iiscon  |=  S3C2410_IISCON_TXIDLE;
		iiscon  &= ~S3C2410_IISCON_TXDMAEN;
		iismod  &= ~S3C2410_IISMOD_TXMODE;

		writel(iiscon,  s3c24xx_i2s.regs + S3C2410_IISCON);
		writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
		writel(iismod,  s3c24xx_i2s.regs + S3C2410_IISMOD);
	}

	pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
}

static void s3c24xx_snd_rxctrl(int on)
{
	u32 iisfcon;
	u32 iiscon;
	u32 iismod;

	pr_debug("Entered %s\n", __func__);

	iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
	iiscon  = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	iismod  = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);

	pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);

	if (on) {
		iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
		iiscon  |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
		iiscon  &= ~S3C2410_IISCON_RXIDLE;
		iismod  |= S3C2410_IISMOD_RXMODE;

		writel(iismod,  s3c24xx_i2s.regs + S3C2410_IISMOD);
		writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
		writel(iiscon,  s3c24xx_i2s.regs + S3C2410_IISCON);
	} else {
		/* note, we have to disable the FIFOs otherwise bad things
		 * seem to happen when the DMA stops. According to the
		 * Samsung supplied kernel, this should allow the DMA
		 * engine and FIFOs to reset. If this isn't allowed, the
		 * DMA engine will simply freeze randomly.
		 */

		iisfcon &= ~S3C2410_IISFCON_RXENABLE;
		iisfcon &= ~S3C2410_IISFCON_RXDMA;
		iiscon  |= S3C2410_IISCON_RXIDLE;
		iiscon  &= ~S3C2410_IISCON_RXDMAEN;
		iismod  &= ~S3C2410_IISMOD_RXMODE;

		writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
		writel(iiscon,  s3c24xx_i2s.regs + S3C2410_IISCON);
		writel(iismod,  s3c24xx_i2s.regs + S3C2410_IISMOD);
	}

	pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
}

/*
 * Wait for the LR signal to allow synchronisation to the L/R clock
 * from the codec. May only be needed for slave mode.
 */
static int s3c24xx_snd_lrsync(void)
{
	u32 iiscon;
	int timeout = 50; /* 5ms */

	pr_debug("Entered %s\n", __func__);

	while (1) {
		iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
		if (iiscon & S3C2410_IISCON_LRINDEX)
			break;

		if (!timeout--)
			return -ETIMEDOUT;
		udelay(100);
	}

	return 0;
}

/*
 * Check whether CPU is the master or slave
 */
static inline int s3c24xx_snd_is_clkmaster(void)
{
	pr_debug("Entered %s\n", __func__);

	return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
}

/*
 * Set S3C24xx I2S DAI format
 */
static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
		unsigned int fmt)
{
	u32 iismod;

	pr_debug("Entered %s\n", __func__);

	iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	pr_debug("hw_params r: IISMOD: %x \n", iismod);

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		iismod |= S3C2410_IISMOD_SLAVE;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		iismod &= ~S3C2410_IISMOD_SLAVE;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_LEFT_J:
		iismod |= S3C2410_IISMOD_MSB;
		break;
	case SND_SOC_DAIFMT_I2S:
		iismod &= ~S3C2410_IISMOD_MSB;
		break;
	default:
		return -EINVAL;
	}

	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	pr_debug("hw_params w: IISMOD: %x \n", iismod);
	return 0;
}

static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	u32 iismod;

	pr_debug("Entered %s\n", __func__);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
	else
		rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;

	/* Working copies of register */
	iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	pr_debug("hw_params r: IISMOD: %x\n", iismod);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		iismod &= ~S3C2410_IISMOD_16BIT;
		((struct s3c24xx_pcm_dma_params *)
		  rtd->dai->cpu_dai->dma_data)->dma_size = 1;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		iismod |= S3C2410_IISMOD_16BIT;
		((struct s3c24xx_pcm_dma_params *)
		  rtd->dai->cpu_dai->dma_data)->dma_size = 2;
		break;
	default:
		return -EINVAL;
	}

	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	pr_debug("hw_params w: IISMOD: %x\n", iismod);
	return 0;
}

static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			       struct snd_soc_dai *dai)
{
	int ret = 0;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int channel = ((struct s3c24xx_pcm_dma_params *)
		  rtd->dai->cpu_dai->dma_data)->channel;

	pr_debug("Entered %s\n", __func__);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		if (!s3c24xx_snd_is_clkmaster()) {
			ret = s3c24xx_snd_lrsync();
			if (ret)
				goto exit_err;
		}

		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			s3c24xx_snd_rxctrl(1);
		else
			s3c24xx_snd_txctrl(1);

		s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
			s3c24xx_snd_rxctrl(0);
		else
			s3c24xx_snd_txctrl(0);
		break;
	default:
		ret = -EINVAL;
		break;
	}

exit_err:
	return ret;
}

/*
 * Set S3C24xx Clock source
 */
static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
	int clk_id, unsigned int freq, int dir)
{
	u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);

	pr_debug("Entered %s\n", __func__);

	iismod &= ~S3C2440_IISMOD_MPLL;

	switch (clk_id) {
	case S3C24XX_CLKSRC_PCLK:
		break;
	case S3C24XX_CLKSRC_MPLL:
		iismod |= S3C2440_IISMOD_MPLL;
		break;
	default:
		return -EINVAL;
	}

	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	return 0;
}

/*
 * Set S3C24xx Clock dividers
 */
static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
	int div_id, int div)
{
	u32 reg;

	pr_debug("Entered %s\n", __func__);

	switch (div_id) {
	case S3C24XX_DIV_BCLK:
		reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
		writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
		break;
	case S3C24XX_DIV_MCLK:
		reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
		writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
		break;
	case S3C24XX_DIV_PRESCALER:
		writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
		reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
		writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

/*
 * To avoid duplicating clock code, allow machine driver to
 * get the clockrate from here.
 */
u32 s3c24xx_i2s_get_clockrate(void)
{
	return clk_get_rate(s3c24xx_i2s.iis_clk);
}
EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);

static int s3c24xx_i2s_probe(struct platform_device *pdev,
			     struct snd_soc_dai *dai)
{
	pr_debug("Entered %s\n", __func__);

	s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
	if (s3c24xx_i2s.regs == NULL)
		return -ENXIO;

	s3c24xx_i2s.iis_clk = clk_get(&pdev->dev, "iis");
	if (s3c24xx_i2s.iis_clk == NULL) {
		pr_err("failed to get iis_clock\n");
		iounmap(s3c24xx_i2s.regs);
		return -ENODEV;
	}
	clk_enable(s3c24xx_i2s.iis_clk);

	/* Configure the I2S pins in correct mode */
	s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
	s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
	s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
	s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
	s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);

	writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);

	s3c24xx_snd_txctrl(0);
	s3c24xx_snd_rxctrl(0);

	return 0;
}

#ifdef CONFIG_PM
static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
{
	pr_debug("Entered %s\n", __func__);

	s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
	s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);

	clk_disable(s3c24xx_i2s.iis_clk);

	return 0;
}

static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
{
	pr_debug("Entered %s\n", __func__);
	clk_enable(s3c24xx_i2s.iis_clk);

	writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
	writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
	writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);

	return 0;
}
#else
#define s3c24xx_i2s_suspend NULL
#define s3c24xx_i2s_resume NULL
#endif


#define S3C24XX_I2S_RATES \
	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
	SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
	SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

static struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
	.trigger	= s3c24xx_i2s_trigger,
	.hw_params	= s3c24xx_i2s_hw_params,
	.set_fmt	= s3c24xx_i2s_set_fmt,
	.set_clkdiv	= s3c24xx_i2s_set_clkdiv,
	.set_sysclk	= s3c24xx_i2s_set_sysclk,
};

struct snd_soc_dai s3c24xx_i2s_dai = {
	.name = "s3c24xx-i2s",
	.id = 0,
	.probe = s3c24xx_i2s_probe,
	.suspend = s3c24xx_i2s_suspend,
	.resume = s3c24xx_i2s_resume,
	.playback = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = S3C24XX_I2S_RATES,
		.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
	.capture = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = S3C24XX_I2S_RATES,
		.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &s3c24xx_i2s_dai_ops,
};
EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);

static int __init s3c24xx_i2s_init(void)
{
	return snd_soc_register_dai(&s3c24xx_i2s_dai);
}
module_init(s3c24xx_i2s_init);

static void __exit s3c24xx_i2s_exit(void)
{
	snd_soc_unregister_dai(&s3c24xx_i2s_dai);
}
module_exit(s3c24xx_i2s_exit);

/* Module information */
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
MODULE_LICENSE("GPL");
Commit	Line	Data
c1422a66 BD	1	/*
	2	* s3c24xx-i2s.c -- ALSA Soc Audio Layer
	3	*
	4	* (c) 2006 Wolfson Microelectronics PLC.
	5	* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
	6	*
c8efef17	7	* Copyright 2004-2005 Simtec Electronics
c1422a66 BD	8	* http://armlinux.simtec.co.uk/
	9	* Ben Dooks <ben@simtec.co.uk>
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
c1422a66 BD	15	*/
	16
	17	#include <linux/init.h>
	18	#include <linux/module.h>
	19	#include <linux/device.h>
	20	#include <linux/delay.h>
	21	#include <linux/clk.h>
f11b7992	22	#include <linux/jiffies.h>
40efc15f	23	#include <linux/io.h>
ec976d6e BD	24	#include <linux/gpio.h>
ec976d6e BD	25
c1422a66 BD	26	#include <sound/core.h>
	27	#include <sound/pcm.h>
	28	#include <sound/pcm_params.h>
	29	#include <sound/initval.h>
	30	#include <sound/soc.h>
	31
a09e64fb RK	32	#include <mach/hardware.h>
	33	#include <mach/regs-gpio.h>
	34	#include <mach/regs-clock.h>
899e6cf5	35	#include <plat/audio.h>
c1422a66	36	#include <asm/dma.h>
a09e64fb	37	#include <mach/dma.h>
c1422a66	38
8150bc88	39	#include <plat/regs-iis.h>
aa9673cf	40
c1422a66 BD	41	#include "s3c24xx-pcm.h"
	42	#include "s3c24xx-i2s.h"
	43
c1422a66 BD	44	static struct s3c2410_dma_client s3c24xx_dma_client_out = {
	45	.name = "I2S PCM Stereo out"
	46	};
	47
	48	static struct s3c2410_dma_client s3c24xx_dma_client_in = {
	49	.name = "I2S PCM Stereo in"
	50	};
	51
	52	static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out = {
	53	.client = &s3c24xx_dma_client_out,
	54	.channel = DMACH_I2S_OUT,
e81208fe GG	55	.dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
e81208fe GG	56	.dma_size = 2,
c1422a66 BD	57	};
	58
	59	static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = {
	60	.client = &s3c24xx_dma_client_in,
	61	.channel = DMACH_I2S_IN,
e81208fe GG	62	.dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
e81208fe GG	63	.dma_size = 2,
c1422a66 BD	64	};
	65
	66	struct s3c24xx_i2s_info {
	67	void __iomem *regs;
	68	struct clk *iis_clk;
5cd919a2 GG	69	u32 iiscon;
	70	u32 iismod;
	71	u32 iisfcon;
	72	u32 iispsr;
c1422a66 BD	73	};
	74	static struct s3c24xx_i2s_info s3c24xx_i2s;
	75
	76	static void s3c24xx_snd_txctrl(int on)
	77	{
	78	u32 iisfcon;
	79	u32 iiscon;
	80	u32 iismod;
	81
ee7d4767	82	pr_debug("Entered %s\n", __func__);
c1422a66 BD	83
	84	iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
	85	iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	86	iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	87
5314adc3	88	pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
c1422a66 BD	89
	90	if (on) {
	91	iisfcon \|= S3C2410_IISFCON_TXDMA \| S3C2410_IISFCON_TXENABLE;
	92	iiscon \|= S3C2410_IISCON_TXDMAEN \| S3C2410_IISCON_IISEN;
	93	iiscon &= ~S3C2410_IISCON_TXIDLE;
	94	iismod \|= S3C2410_IISMOD_TXMODE;
	95
	96	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	97	writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
	98	writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
	99	} else {
	100	/* note, we have to disable the FIFOs otherwise bad things
	101	* seem to happen when the DMA stops. According to the
	102	* Samsung supplied kernel, this should allow the DMA
	103	* engine and FIFOs to reset. If this isn't allowed, the
	104	* DMA engine will simply freeze randomly.
	105	*/
	106
	107	iisfcon &= ~S3C2410_IISFCON_TXENABLE;
	108	iisfcon &= ~S3C2410_IISFCON_TXDMA;
	109	iiscon \|= S3C2410_IISCON_TXIDLE;
	110	iiscon &= ~S3C2410_IISCON_TXDMAEN;
	111	iismod &= ~S3C2410_IISMOD_TXMODE;
	112
	113	writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
	114	writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
	115	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	116	}
	117
5314adc3	118	pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
c1422a66 BD	119	}
	120
	121	static void s3c24xx_snd_rxctrl(int on)
	122	{
	123	u32 iisfcon;
	124	u32 iiscon;
	125	u32 iismod;
	126
ee7d4767	127	pr_debug("Entered %s\n", __func__);
c1422a66 BD	128
	129	iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
	130	iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	131	iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	132
5314adc3	133	pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
c1422a66 BD	134
	135	if (on) {
	136	iisfcon \|= S3C2410_IISFCON_RXDMA \| S3C2410_IISFCON_RXENABLE;
	137	iiscon \|= S3C2410_IISCON_RXDMAEN \| S3C2410_IISCON_IISEN;
	138	iiscon &= ~S3C2410_IISCON_RXIDLE;
	139	iismod \|= S3C2410_IISMOD_RXMODE;
	140
	141	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	142	writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
	143	writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
	144	} else {
	145	/* note, we have to disable the FIFOs otherwise bad things
	146	* seem to happen when the DMA stops. According to the
	147	* Samsung supplied kernel, this should allow the DMA
	148	* engine and FIFOs to reset. If this isn't allowed, the
	149	* DMA engine will simply freeze randomly.
	150	*/
	151
0015e7d1 MB	152	iisfcon &= ~S3C2410_IISFCON_RXENABLE;
	153	iisfcon &= ~S3C2410_IISFCON_RXDMA;
	154	iiscon \|= S3C2410_IISCON_RXIDLE;
	155	iiscon &= ~S3C2410_IISCON_RXDMAEN;
c1422a66 BD	156	iismod &= ~S3C2410_IISMOD_RXMODE;
	157
	158	writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
	159	writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
	160	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	161	}
	162
5314adc3	163	pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
c1422a66 BD	164	}
	165
	166	/*
	167	* Wait for the LR signal to allow synchronisation to the L/R clock
	168	* from the codec. May only be needed for slave mode.
	169	*/
	170	static int s3c24xx_snd_lrsync(void)
	171	{
	172	u32 iiscon;
33e5b222	173	int timeout = 50; /* 5ms */
c1422a66	174
ee7d4767	175	pr_debug("Entered %s\n", __func__);
c1422a66 BD	176
	177	while (1) {
	178	iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	179	if (iiscon & S3C2410_IISCON_LRINDEX)
	180	break;
	181
33e5b222	182	if (!timeout--)
c1422a66	183	return -ETIMEDOUT;
33e5b222	184	udelay(100);
c1422a66 BD	185	}
	186
	187	return 0;
	188	}
	189
	190	/*
	191	* Check whether CPU is the master or slave
	192	*/
	193	static inline int s3c24xx_snd_is_clkmaster(void)
	194	{
ee7d4767	195	pr_debug("Entered %s\n", __func__);
c1422a66 BD	196
	197	return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
	198	}
	199
	200	/*
	201	* Set S3C24xx I2S DAI format
	202	*/
1992a6fb	203	static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
c1422a66 BD	204	unsigned int fmt)
	205	{
	206	u32 iismod;
	207
ee7d4767	208	pr_debug("Entered %s\n", __func__);
c1422a66 BD	209
c1422a66 BD	210	iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
5314adc3	211	pr_debug("hw_params r: IISMOD: %x \n", iismod);
c1422a66 BD	212
	213	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	214	case SND_SOC_DAIFMT_CBM_CFM:
	215	iismod \|= S3C2410_IISMOD_SLAVE;
	216	break;
	217	case SND_SOC_DAIFMT_CBS_CFS:
2c36eecf	218	iismod &= ~S3C2410_IISMOD_SLAVE;
c1422a66 BD	219	break;
	220	default:
	221	return -EINVAL;
	222	}
	223
	224	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	225	case SND_SOC_DAIFMT_LEFT_J:
	226	iismod \|= S3C2410_IISMOD_MSB;
	227	break;
	228	case SND_SOC_DAIFMT_I2S:
2c36eecf	229	iismod &= ~S3C2410_IISMOD_MSB;
c1422a66 BD	230	break;
	231	default:
	232	return -EINVAL;
	233	}
	234
	235	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
5314adc3	236	pr_debug("hw_params w: IISMOD: %x \n", iismod);
c1422a66 BD	237	return 0;
	238	}
	239
	240	static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
dee89c4d MB	241	struct snd_pcm_hw_params *params,
dee89c4d MB	242	struct snd_soc_dai *dai)
c1422a66 BD	243	{
	244	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	245	u32 iismod;
	246
ee7d4767	247	pr_debug("Entered %s\n", __func__);
c1422a66 BD	248
	249	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	250	rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
	251	else
	252	rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;
	253
	254	/* Working copies of register */
	255	iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
5314adc3	256	pr_debug("hw_params r: IISMOD: %x\n", iismod);
c1422a66 BD	257
	258	switch (params_format(params)) {
	259	case SNDRV_PCM_FORMAT_S8:
53599bbc CP	260	iismod &= ~S3C2410_IISMOD_16BIT;
	261	((struct s3c24xx_pcm_dma_params *)
	262	rtd->dai->cpu_dai->dma_data)->dma_size = 1;
c1422a66 BD	263	break;
	264	case SNDRV_PCM_FORMAT_S16_LE:
	265	iismod \|= S3C2410_IISMOD_16BIT;
53599bbc CP	266	((struct s3c24xx_pcm_dma_params *)
53599bbc CP	267	rtd->dai->cpu_dai->dma_data)->dma_size = 2;
c1422a66	268	break;
53599bbc CP	269	default:
53599bbc CP	270	return -EINVAL;
c1422a66 BD	271	}
	272
	273	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
5314adc3	274	pr_debug("hw_params w: IISMOD: %x\n", iismod);
c1422a66 BD	275	return 0;
	276	}
	277
dee89c4d MB	278	static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
dee89c4d MB	279	struct snd_soc_dai *dai)
c1422a66 BD	280	{
c1422a66 BD	281	int ret = 0;
faf907c7 SL	282	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	283	int channel = ((struct s3c24xx_pcm_dma_params *)
	284	rtd->dai->cpu_dai->dma_data)->channel;
c1422a66	285
ee7d4767	286	pr_debug("Entered %s\n", __func__);
c1422a66 BD	287
	288	switch (cmd) {
	289	case SNDRV_PCM_TRIGGER_START:
	290	case SNDRV_PCM_TRIGGER_RESUME:
	291	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	292	if (!s3c24xx_snd_is_clkmaster()) {
	293	ret = s3c24xx_snd_lrsync();
	294	if (ret)
	295	goto exit_err;
	296	}
	297
	298	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	299	s3c24xx_snd_rxctrl(1);
	300	else
	301	s3c24xx_snd_txctrl(1);
faf907c7 SL	302
faf907c7 SL	303	s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);
c1422a66 BD	304	break;
	305	case SNDRV_PCM_TRIGGER_STOP:
	306	case SNDRV_PCM_TRIGGER_SUSPEND:
	307	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	308	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	309	s3c24xx_snd_rxctrl(0);
	310	else
	311	s3c24xx_snd_txctrl(0);
	312	break;
	313	default:
	314	ret = -EINVAL;
	315	break;
	316	}
	317
	318	exit_err:
	319	return ret;
	320	}
	321
	322	/*
	323	* Set S3C24xx Clock source
	324	*/
1992a6fb	325	static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
c1422a66 BD	326	int clk_id, unsigned int freq, int dir)
	327	{
	328	u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	329
ee7d4767	330	pr_debug("Entered %s\n", __func__);
c1422a66 BD	331
	332	iismod &= ~S3C2440_IISMOD_MPLL;
	333
	334	switch (clk_id) {
	335	case S3C24XX_CLKSRC_PCLK:
	336	break;
	337	case S3C24XX_CLKSRC_MPLL:
	338	iismod \|= S3C2440_IISMOD_MPLL;
	339	break;
	340	default:
	341	return -EINVAL;
	342	}
	343
	344	writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	345	return 0;
	346	}
	347
	348	/*
	349	* Set S3C24xx Clock dividers
	350	*/
1992a6fb	351	static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
c1422a66 BD	352	int div_id, int div)
	353	{
	354	u32 reg;
	355
ee7d4767	356	pr_debug("Entered %s\n", __func__);
c1422a66 BD	357
c1422a66 BD	358	switch (div_id) {
82fb159a	359	case S3C24XX_DIV_BCLK:
c1422a66 BD	360	reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
	361	writel(reg \| div, s3c24xx_i2s.regs + S3C2410_IISMOD);
	362	break;
82fb159a	363	case S3C24XX_DIV_MCLK:
c1422a66 BD	364	reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
	365	writel(reg \| div, s3c24xx_i2s.regs + S3C2410_IISMOD);
	366	break;
	367	case S3C24XX_DIV_PRESCALER:
	368	writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
	369	reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	370	writel(reg \| S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
	371	break;
	372	default:
	373	return -EINVAL;
	374	}
	375
	376	return 0;
	377	}
	378
	379	/*
	380	* To avoid duplicating clock code, allow machine driver to
	381	* get the clockrate from here.
	382	*/
	383	u32 s3c24xx_i2s_get_clockrate(void)
	384	{
	385	return clk_get_rate(s3c24xx_i2s.iis_clk);
	386	}
	387	EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
	388
bdb92876	389	static int s3c24xx_i2s_probe(struct platform_device *pdev,
1992a6fb	390	struct snd_soc_dai *dai)
c1422a66	391	{
ee7d4767	392	pr_debug("Entered %s\n", __func__);
c1422a66 BD	393
	394	s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
	395	if (s3c24xx_i2s.regs == NULL)
	396	return -ENXIO;
	397
0fe564a5	398	s3c24xx_i2s.iis_clk = clk_get(&pdev->dev, "iis");
c1422a66	399	if (s3c24xx_i2s.iis_clk == NULL) {
b52a5195	400	pr_err("failed to get iis_clock\n");
8642a4ba	401	iounmap(s3c24xx_i2s.regs);
c1422a66 BD	402	return -ENODEV;
	403	}
	404	clk_enable(s3c24xx_i2s.iis_clk);
	405
	406	/* Configure the I2S pins in correct mode */
	407	s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
	408	s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
	409	s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
	410	s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
	411	s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
	412
	413	writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
	414
	415	s3c24xx_snd_txctrl(0);
	416	s3c24xx_snd_rxctrl(0);
	417
	418	return 0;
	419	}
	420
5cd919a2	421	#ifdef CONFIG_PM
dc7d7b83	422	static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
5cd919a2	423	{
ee7d4767	424	pr_debug("Entered %s\n", __func__);
40920307	425
5cd919a2 GG	426	s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
	427	s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
	428	s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
	429	s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
	430
	431	clk_disable(s3c24xx_i2s.iis_clk);
	432
	433	return 0;
	434	}
	435
dc7d7b83	436	static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
5cd919a2	437	{
ee7d4767	438	pr_debug("Entered %s\n", __func__);
5cd919a2 GG	439	clk_enable(s3c24xx_i2s.iis_clk);
	440
	441	writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
	442	writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
	443	writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
	444	writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
	445
	446	return 0;
	447	}
	448	#else
	449	#define s3c24xx_i2s_suspend NULL
	450	#define s3c24xx_i2s_resume NULL
	451	#endif
	452
	453
c1422a66 BD	454	#define S3C24XX_I2S_RATES \
	455	(SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_11025 \| SNDRV_PCM_RATE_16000 \| \
	456	SNDRV_PCM_RATE_22050 \| SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \| \
	457	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_88200 \| SNDRV_PCM_RATE_96000)
	458
6335d055 EM	459	static struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
	460	.trigger = s3c24xx_i2s_trigger,
	461	.hw_params = s3c24xx_i2s_hw_params,
	462	.set_fmt = s3c24xx_i2s_set_fmt,
	463	.set_clkdiv = s3c24xx_i2s_set_clkdiv,
	464	.set_sysclk = s3c24xx_i2s_set_sysclk,
	465	};
	466
1992a6fb	467	struct snd_soc_dai s3c24xx_i2s_dai = {
c1422a66 BD	468	.name = "s3c24xx-i2s",
c1422a66 BD	469	.id = 0,
c1422a66	470	.probe = s3c24xx_i2s_probe,
5cd919a2 GG	471	.suspend = s3c24xx_i2s_suspend,
5cd919a2 GG	472	.resume = s3c24xx_i2s_resume,
c1422a66 BD	473	.playback = {
	474	.channels_min = 2,
	475	.channels_max = 2,
	476	.rates = S3C24XX_I2S_RATES,
	477	.formats = SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_LE,},
	478	.capture = {
	479	.channels_min = 2,
	480	.channels_max = 2,
	481	.rates = S3C24XX_I2S_RATES,
	482	.formats = SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_LE,},
6335d055	483	.ops = &s3c24xx_i2s_dai_ops,
c1422a66 BD	484	};
	485	EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);
	486
c9b3a40f	487	static int __init s3c24xx_i2s_init(void)
3f4b783c MB	488	{
	489	return snd_soc_register_dai(&s3c24xx_i2s_dai);
	490	}
	491	module_init(s3c24xx_i2s_init);
	492
	493	static void __exit s3c24xx_i2s_exit(void)
	494	{
	495	snd_soc_unregister_dai(&s3c24xx_i2s_dai);
	496	}
	497	module_exit(s3c24xx_i2s_exit);
	498
c1422a66 BD	499	/* Module information */
	500	MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
	501	MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
	502	MODULE_LICENSE("GPL");