/* sound/soc/s3c24xx/s3c64xx-i2s.c
 *
 * ALSA SoC Audio Layer - S3C64XX I2S driver
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.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 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/regs-s3c2412-iis.h>
#include <plat/gpio-bank-d.h>
#include <plat/gpio-bank-e.h>
#include <plat/gpio-cfg.h>
#include <plat/audio.h>

#include <mach/map.h>
#include <mach/dma.h>

#include "s3c24xx-pcm.h"
#include "s3c64xx-i2s.h"

static struct s3c2410_dma_client s3c64xx_dma_client_out = {
	.name		= "I2S PCM Stereo out"
};

static struct s3c2410_dma_client s3c64xx_dma_client_in = {
	.name		= "I2S PCM Stereo in"
};

static struct s3c24xx_pcm_dma_params s3c64xx_i2s_pcm_stereo_out[2] = {
	[0] = {
		.channel	= DMACH_I2S0_OUT,
		.client		= &s3c64xx_dma_client_out,
		.dma_addr	= S3C64XX_PA_IIS0 + S3C2412_IISTXD,
		.dma_size	= 4,
	},
	[1] = {
		.channel	= DMACH_I2S1_OUT,
		.client		= &s3c64xx_dma_client_out,
		.dma_addr	= S3C64XX_PA_IIS1 + S3C2412_IISTXD,
		.dma_size	= 4,
	},
};

static struct s3c24xx_pcm_dma_params s3c64xx_i2s_pcm_stereo_in[2] = {
	[0] = {
		.channel	= DMACH_I2S0_IN,
		.client		= &s3c64xx_dma_client_in,
		.dma_addr	= S3C64XX_PA_IIS0 + S3C2412_IISRXD,
		.dma_size	= 4,
	},
	[1] = {
		.channel	= DMACH_I2S1_IN,
		.client		= &s3c64xx_dma_client_in,
		.dma_addr	= S3C64XX_PA_IIS1 + S3C2412_IISRXD,
		.dma_size	= 4,
	},
};

static struct s3c_i2sv2_info s3c64xx_i2s[2];

static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
{
	return cpu_dai->private_data;
}

static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
				  int clk_id, unsigned int freq, int dir)
{
	struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
	u32 iismod = readl(i2s->regs + S3C2412_IISMOD);

	switch (clk_id) {
	case S3C64XX_CLKSRC_PCLK:
		iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
		break;

	case S3C64XX_CLKSRC_MUX:
		iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
		break;

	default:
		return -EINVAL;
	}

	writel(iismod, i2s->regs + S3C2412_IISMOD);

	return 0;
}


unsigned long s3c64xx_i2s_get_clockrate(struct snd_soc_dai *dai)
{
	struct s3c_i2sv2_info *i2s = to_info(dai);

	return clk_get_rate(i2s->iis_cclk);
}
EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clockrate);

static int s3c64xx_i2s_probe(struct platform_device *pdev,
			     struct snd_soc_dai *dai)
{
	struct device *dev = &pdev->dev;
	struct s3c_i2sv2_info *i2s;
	int ret;

	dev_dbg(dev, "%s: probing dai %d\n", __func__, pdev->id);

	if (pdev->id < 0 || pdev->id > ARRAY_SIZE(s3c64xx_i2s)) {
		dev_err(dev, "id %d out of range\n", pdev->id);
		return -EINVAL;
	}

	i2s = &s3c64xx_i2s[pdev->id];

	ret = s3c_i2sv2_probe(pdev, dai, i2s,
			      pdev->id ? S3C64XX_PA_IIS1 : S3C64XX_PA_IIS0);
	if (ret)
		return ret;

	i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
	i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];

	i2s->iis_cclk = clk_get(dev, "audio-bus");
	if (IS_ERR(i2s->iis_cclk)) {
		dev_err(dev, "failed to get audio-bus");
		iounmap(i2s->regs);
		return -ENODEV;
	}

	/* configure GPIO for i2s port */
	switch (pdev->id) {
	case 0:
		s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
		s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
		s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
		s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
		s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
		break;
	case 1:
		s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
		s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
		s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
		s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
		s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
	}

	return 0;
}


#define S3C64XX_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)

#define S3C64XX_I2S_FMTS \
	(SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE)

static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops = {
	.set_sysclk	= s3c64xx_i2s_set_sysclk,	
};

struct snd_soc_dai s3c64xx_i2s_dai = {
	.name		= "s3c64xx-i2s",
	.id		= 0,
	.probe		= s3c64xx_i2s_probe,
	.playback = {
		.channels_min	= 2,
		.channels_max	= 2,
		.rates		= S3C64XX_I2S_RATES,
		.formats	= S3C64XX_I2S_FMTS,
	},
	.capture = {
		.channels_min	= 2,
		.channels_max	= 2,
		.rates		= S3C64XX_I2S_RATES,
		.formats	= S3C64XX_I2S_FMTS,
	},
	.ops = &s3c64xx_i2s_dai_ops,
};
EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);

static int __init s3c64xx_i2s_init(void)
{
	return  s3c_i2sv2_register_dai(&s3c64xx_i2s_dai);
}
module_init(s3c64xx_i2s_init);

static void __exit s3c64xx_i2s_exit(void)
{
	snd_soc_unregister_dai(&s3c64xx_i2s_dai);
}
module_exit(s3c64xx_i2s_exit);

/* Module information */
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
MODULE_LICENSE("GPL");