sound/soc/s3c24xx/s3c2443-ac97.c - kernel/msm - Gitiles

 /*
  * s3c2443-ac97.c  --  ALSA Soc Audio Layer
  *
  * (c) 2007 Wolfson Microelectronics PLC.
  * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
  *
  *  Copyright (C) 2005, Sean Choi <sh428.choi@samsung.com>
  *  All rights reserved.
  *
  *  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/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/wait.h>
 #include <linux/delay.h>
 #include <linux/gpio.h>
 #include <linux/clk.h>

 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/ac97_codec.h>
 #include <sound/initval.h>
 #include <sound/soc.h>

 #include <mach/hardware.h>
 #include <plat/regs-ac97.h>
 #include <mach/regs-gpio.h>
 #include <mach/regs-clock.h>
 #include <asm/dma.h>
 #include <mach/dma.h>

 #include "s3c-dma.h"
 #include "s3c24xx-ac97.h"

 struct s3c24xx_ac97_info {
 	void __iomem	*regs;
 	struct clk	*ac97_clk;
 };
 static struct s3c24xx_ac97_info s3c24xx_ac97;

 static DECLARE_COMPLETION(ac97_completion);
 static u32 codec_ready;
 static DEFINE_MUTEX(ac97_mutex);

 static unsigned short s3c2443_ac97_read(struct snd_ac97 *ac97,
 	unsigned short reg)
 {
 	u32 ac_glbctrl;
 	u32 ac_codec_cmd;
 	u32 stat, addr, data;

 	mutex_lock(&ac97_mutex);

 	codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
 	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
 	ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
 	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);

 	udelay(50);

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

 	wait_for_completion(&ac97_completion);

 	stat = readl(s3c24xx_ac97.regs + S3C_AC97_STAT);
 	addr = (stat >> 16) & 0x7f;
 	data = (stat & 0xffff);

 	if (addr != reg)
 		printk(KERN_ERR "s3c24xx-ac97: req addr = %02x,"
 				" rep addr = %02x\n", reg, addr);

 	mutex_unlock(&ac97_mutex);

 	return (unsigned short)data;
 }

 static void s3c2443_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 	unsigned short val)
 {
 	u32 ac_glbctrl;
 	u32 ac_codec_cmd;

 	mutex_lock(&ac97_mutex);

 	codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
 	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
 	ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
 	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);

 	udelay(50);

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

 	wait_for_completion(&ac97_completion);

 	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
 	ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
 	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);

 	mutex_unlock(&ac97_mutex);

 }

 static void s3c2443_ac97_warm_reset(struct snd_ac97 *ac97)
 {
 	u32 ac_glbctrl;

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl = S3C_AC97_GLBCTRL_WARMRESET;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl = 0;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);
 }

 static void s3c2443_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	u32 ac_glbctrl;

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl = S3C_AC97_GLBCTRL_COLDRESET;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl = 0;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA |
 		S3C_AC97_GLBCTRL_PCMINTM_DMA | S3C_AC97_GLBCTRL_MICINTM_DMA;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 }

 static irqreturn_t s3c2443_ac97_irq(int irq, void *dev_id)
 {
 	int status;
 	u32 ac_glbctrl;

 	status = readl(s3c24xx_ac97.regs + S3C_AC97_GLBSTAT) & codec_ready;

 	if (status) {
 		ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 		ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
 		writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 		complete(&ac97_completion);
 	}
 	return IRQ_HANDLED;
 }

 struct snd_ac97_bus_ops soc_ac97_ops = {
 	.read	= s3c2443_ac97_read,
 	.write	= s3c2443_ac97_write,
 	.warm_reset	= s3c2443_ac97_warm_reset,
 	.reset	= s3c2443_ac97_cold_reset,
 };

 static struct s3c2410_dma_client s3c2443_dma_client_out = {
 	.name = "AC97 PCM Stereo out"
 };

 static struct s3c2410_dma_client s3c2443_dma_client_in = {
 	.name = "AC97 PCM Stereo in"
 };

 static struct s3c2410_dma_client s3c2443_dma_client_micin = {
 	.name = "AC97 Mic Mono in"
 };

 static struct s3c_dma_params s3c2443_ac97_pcm_stereo_out = {
 	.client		= &s3c2443_dma_client_out,
 	.channel	= DMACH_PCM_OUT,
 	.dma_addr	= S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
 	.dma_size	= 4,
 };

 static struct s3c_dma_params s3c2443_ac97_pcm_stereo_in = {
 	.client		= &s3c2443_dma_client_in,
 	.channel	= DMACH_PCM_IN,
 	.dma_addr	= S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
 	.dma_size	= 4,
 };

 static struct s3c_dma_params s3c2443_ac97_mic_mono_in = {
 	.client		= &s3c2443_dma_client_micin,
 	.channel	= DMACH_MIC_IN,
 	.dma_addr	= S3C2440_PA_AC97 + S3C_AC97_MIC_DATA,
 	.dma_size	= 4,
 };

 static int s3c2443_ac97_probe(struct platform_device *pdev,
 			      struct snd_soc_dai *dai)
 {
 	int ret;
 	u32 ac_glbctrl;

 	s3c24xx_ac97.regs = ioremap(S3C2440_PA_AC97, 0x100);
 	if (s3c24xx_ac97.regs == NULL)
 		return -ENXIO;

 	s3c24xx_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
 	if (s3c24xx_ac97.ac97_clk == NULL) {
 		printk(KERN_ERR "s3c2443-ac97 failed to get ac97_clock\n");
 		iounmap(s3c24xx_ac97.regs);
 		return -ENODEV;
 	}
 	clk_enable(s3c24xx_ac97.ac97_clk);

 	s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2443_GPE0_AC_nRESET);
 	s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2443_GPE1_AC_SYNC);
 	s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2443_GPE2_AC_BITCLK);
 	s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2443_GPE3_AC_SDI);
 	s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2443_GPE4_AC_SDO);

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl = S3C_AC97_GLBCTRL_COLDRESET;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl = 0;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

 	ret = request_irq(IRQ_S3C244x_AC97, s3c2443_ac97_irq,
 		IRQF_DISABLED, "AC97", NULL);
 	if (ret < 0) {
 		printk(KERN_ERR "s3c24xx-ac97: interrupt request failed.\n");
 		clk_disable(s3c24xx_ac97.ac97_clk);
 		clk_put(s3c24xx_ac97.ac97_clk);
 		iounmap(s3c24xx_ac97.regs);
 	}
 	return ret;
 }

 static void s3c2443_ac97_remove(struct platform_device *pdev,
 				struct snd_soc_dai *dai)
 {
 	free_irq(IRQ_S3C244x_AC97, NULL);
 	clk_disable(s3c24xx_ac97.ac97_clk);
 	clk_put(s3c24xx_ac97.ac97_clk);
 	iounmap(s3c24xx_ac97.regs);
 }

 static int s3c2443_ac97_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;
 	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		cpu_dai->dma_data = &s3c2443_ac97_pcm_stereo_out;
 	else
 		cpu_dai->dma_data = &s3c2443_ac97_pcm_stereo_in;

 	return 0;
 }

 static int s3c2443_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
 				struct snd_soc_dai *dai)
 {
 	u32 ac_glbctrl;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int channel = ((struct s3c_dma_params *)
 		  rtd->dai->cpu_dai->dma_data)->channel;

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
 		else
 			ac_glbctrl |= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 			ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
 		else
 			ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
 		break;
 	}
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

 	s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);

 	return 0;
 }

 static int s3c2443_ac97_hw_mic_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;
 	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		return -ENODEV;
 	else
 		cpu_dai->dma_data = &s3c2443_ac97_mic_mono_in;

 	return 0;
 }

 static int s3c2443_ac97_mic_trigger(struct snd_pcm_substream *substream,
 				    int cmd, struct snd_soc_dai *dai)
 {
 	u32 ac_glbctrl;
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	int channel = ((struct s3c_dma_params *)
 		  rtd->dai->cpu_dai->dma_data)->channel;

 	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		ac_glbctrl |= S3C_AC97_GLBCTRL_PCMINTM_DMA;
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
 	}
 	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

 	s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);

 	return 0;
 }

 #define s3c2443_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
 		SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)

 static struct snd_soc_dai_ops s3c2443_ac97_dai_ops = {
 	.hw_params	= s3c2443_ac97_hw_params,
 	.trigger	= s3c2443_ac97_trigger,
 };

 static struct snd_soc_dai_ops s3c2443_ac97_mic_dai_ops = {
 	.hw_params	= s3c2443_ac97_hw_mic_params,
 	.trigger	= s3c2443_ac97_mic_trigger,
 };

 struct snd_soc_dai s3c2443_ac97_dai[] = {
 {
 	.name = "s3c2443-ac97",
 	.id = 0,
 	.ac97_control = 1,
 	.probe = s3c2443_ac97_probe,
 	.remove = s3c2443_ac97_remove,
 	.playback = {
 		.stream_name = "AC97 Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = s3c2443_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.capture = {
 		.stream_name = "AC97 Capture",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = s3c2443_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.ops = &s3c2443_ac97_dai_ops,
 },
 {
 	.name = "pxa2xx-ac97-mic",
 	.id = 1,
 	.ac97_control = 1,
 	.capture = {
 		.stream_name = "AC97 Mic Capture",
 		.channels_min = 1,
 		.channels_max = 1,
 		.rates = s3c2443_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.ops = &s3c2443_ac97_mic_dai_ops,
 },
 };
 EXPORT_SYMBOL_GPL(s3c2443_ac97_dai);
 EXPORT_SYMBOL_GPL(soc_ac97_ops);

 static int __init s3c2443_ac97_init(void)
 {
 	return snd_soc_register_dais(s3c2443_ac97_dai,
 				     ARRAY_SIZE(s3c2443_ac97_dai));
 }
 module_init(s3c2443_ac97_init);

 static void __exit s3c2443_ac97_exit(void)
 {
 	snd_soc_unregister_dais(s3c2443_ac97_dai,
 				ARRAY_SIZE(s3c2443_ac97_dai));
 }
 module_exit(s3c2443_ac97_exit);


 MODULE_AUTHOR("Graeme Gregory");
 MODULE_DESCRIPTION("AC97 driver for the Samsung s3c2443 chip");
 MODULE_LICENSE("GPL");
	/*
	* s3c2443-ac97.c -- ALSA Soc Audio Layer
	*
	* (c) 2007 Wolfson Microelectronics PLC.
	* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
	*
	* Copyright (C) 2005, Sean Choi <sh428.choi@samsung.com>
	* All rights reserved.
	*
	* 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/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/wait.h>
	#include <linux/delay.h>
	#include <linux/gpio.h>
	#include <linux/clk.h>

	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/ac97_codec.h>
	#include <sound/initval.h>
	#include <sound/soc.h>

	#include <mach/hardware.h>
	#include <plat/regs-ac97.h>
	#include <mach/regs-gpio.h>
	#include <mach/regs-clock.h>
	#include <asm/dma.h>
	#include <mach/dma.h>

	#include "s3c-dma.h"
	#include "s3c24xx-ac97.h"

	struct s3c24xx_ac97_info {
	void __iomem *regs;
	struct clk *ac97_clk;
	};
	static struct s3c24xx_ac97_info s3c24xx_ac97;

	static DECLARE_COMPLETION(ac97_completion);
	static u32 codec_ready;
	static DEFINE_MUTEX(ac97_mutex);

	static unsigned short s3c2443_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
	{
	u32 ac_glbctrl;
	u32 ac_codec_cmd;
	u32 stat, addr, data;

	mutex_lock(&ac97_mutex);

	codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd = S3C_AC97_CODEC_CMD_READ \| AC_CMD_ADDR(reg);
	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);

	udelay(50);

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl \|= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

	wait_for_completion(&ac97_completion);

	stat = readl(s3c24xx_ac97.regs + S3C_AC97_STAT);
	addr = (stat >> 16) & 0x7f;
	data = (stat & 0xffff);

	if (addr != reg)
	printk(KERN_ERR "s3c24xx-ac97: req addr = %02x,"
	" rep addr = %02x\n", reg, addr);

	mutex_unlock(&ac97_mutex);

	return (unsigned short)data;
	}

	static void s3c2443_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
	{
	u32 ac_glbctrl;
	u32 ac_codec_cmd;

	mutex_lock(&ac97_mutex);

	codec_ready = S3C_AC97_GLBSTAT_CODECREADY;
	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd = AC_CMD_ADDR(reg) \| AC_CMD_DATA(val);
	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);

	udelay(50);

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl \|= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

	wait_for_completion(&ac97_completion);

	ac_codec_cmd = readl(s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd \|= S3C_AC97_CODEC_CMD_READ;
	writel(ac_codec_cmd, s3c24xx_ac97.regs + S3C_AC97_CODEC_CMD);

	mutex_unlock(&ac97_mutex);

	}

	static void s3c2443_ac97_warm_reset(struct snd_ac97 *ac97)
	{
	u32 ac_glbctrl;

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_WARMRESET;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = 0;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);
	}

	static void s3c2443_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	u32 ac_glbctrl;

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_COLDRESET;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = 0;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl \|= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl \|= S3C_AC97_GLBCTRL_PCMOUTTM_DMA \|
	S3C_AC97_GLBCTRL_PCMINTM_DMA \| S3C_AC97_GLBCTRL_MICINTM_DMA;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	}

	static irqreturn_t s3c2443_ac97_irq(int irq, void *dev_id)
	{
	int status;
	u32 ac_glbctrl;

	status = readl(s3c24xx_ac97.regs + S3C_AC97_GLBSTAT) & codec_ready;

	if (status) {
	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	complete(&ac97_completion);
	}
	return IRQ_HANDLED;
	}

	struct snd_ac97_bus_ops soc_ac97_ops = {
	.read = s3c2443_ac97_read,
	.write = s3c2443_ac97_write,
	.warm_reset = s3c2443_ac97_warm_reset,
	.reset = s3c2443_ac97_cold_reset,
	};

	static struct s3c2410_dma_client s3c2443_dma_client_out = {
	.name = "AC97 PCM Stereo out"
	};

	static struct s3c2410_dma_client s3c2443_dma_client_in = {
	.name = "AC97 PCM Stereo in"
	};

	static struct s3c2410_dma_client s3c2443_dma_client_micin = {
	.name = "AC97 Mic Mono in"
	};

	static struct s3c_dma_params s3c2443_ac97_pcm_stereo_out = {
	.client = &s3c2443_dma_client_out,
	.channel = DMACH_PCM_OUT,
	.dma_addr = S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
	.dma_size = 4,
	};

	static struct s3c_dma_params s3c2443_ac97_pcm_stereo_in = {
	.client = &s3c2443_dma_client_in,
	.channel = DMACH_PCM_IN,
	.dma_addr = S3C2440_PA_AC97 + S3C_AC97_PCM_DATA,
	.dma_size = 4,
	};

	static struct s3c_dma_params s3c2443_ac97_mic_mono_in = {
	.client = &s3c2443_dma_client_micin,
	.channel = DMACH_MIC_IN,
	.dma_addr = S3C2440_PA_AC97 + S3C_AC97_MIC_DATA,
	.dma_size = 4,
	};

	static int s3c2443_ac97_probe(struct platform_device *pdev,
	struct snd_soc_dai *dai)
	{
	int ret;
	u32 ac_glbctrl;

	s3c24xx_ac97.regs = ioremap(S3C2440_PA_AC97, 0x100);
	if (s3c24xx_ac97.regs == NULL)
	return -ENXIO;

	s3c24xx_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
	if (s3c24xx_ac97.ac97_clk == NULL) {
	printk(KERN_ERR "s3c2443-ac97 failed to get ac97_clock\n");
	iounmap(s3c24xx_ac97.regs);
	return -ENODEV;
	}
	clk_enable(s3c24xx_ac97.ac97_clk);

	s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2443_GPE0_AC_nRESET);
	s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2443_GPE1_AC_SYNC);
	s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2443_GPE2_AC_BITCLK);
	s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2443_GPE3_AC_SDI);
	s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2443_GPE4_AC_SDO);

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_COLDRESET;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = 0;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl \|= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

	ret = request_irq(IRQ_S3C244x_AC97, s3c2443_ac97_irq,
	IRQF_DISABLED, "AC97", NULL);
	if (ret < 0) {
	printk(KERN_ERR "s3c24xx-ac97: interrupt request failed.\n");
	clk_disable(s3c24xx_ac97.ac97_clk);
	clk_put(s3c24xx_ac97.ac97_clk);
	iounmap(s3c24xx_ac97.regs);
	}
	return ret;
	}

	static void s3c2443_ac97_remove(struct platform_device *pdev,
	struct snd_soc_dai *dai)
	{
	free_irq(IRQ_S3C244x_AC97, NULL);
	clk_disable(s3c24xx_ac97.ac97_clk);
	clk_put(s3c24xx_ac97.ac97_clk);
	iounmap(s3c24xx_ac97.regs);
	}

	static int s3c2443_ac97_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;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	cpu_dai->dma_data = &s3c2443_ac97_pcm_stereo_out;
	else
	cpu_dai->dma_data = &s3c2443_ac97_pcm_stereo_in;

	return 0;
	}

	static int s3c2443_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	u32 ac_glbctrl;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int channel = ((struct s3c_dma_params *)
	rtd->dai->cpu_dai->dma_data)->channel;

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	ac_glbctrl \|= S3C_AC97_GLBCTRL_PCMINTM_DMA;
	else
	ac_glbctrl \|= S3C_AC97_GLBCTRL_PCMOUTTM_DMA;
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
	else
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;
	break;
	}
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

	s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);

	return 0;
	}

	static int s3c2443_ac97_hw_mic_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;
	struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	return -ENODEV;
	else
	cpu_dai->dma_data = &s3c2443_ac97_mic_mono_in;

	return 0;
	}

	static int s3c2443_ac97_mic_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	u32 ac_glbctrl;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	int channel = ((struct s3c_dma_params *)
	rtd->dai->cpu_dai->dma_data)->channel;

	ac_glbctrl = readl(s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	ac_glbctrl \|= S3C_AC97_GLBCTRL_PCMINTM_DMA;
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
	}
	writel(ac_glbctrl, s3c24xx_ac97.regs + S3C_AC97_GLBCTRL);

	s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);

	return 0;
	}

	#define s3c2443_AC97_RATES (SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_11025 \|\
	SNDRV_PCM_RATE_16000 \| SNDRV_PCM_RATE_22050 \| \
	SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000)

	static struct snd_soc_dai_ops s3c2443_ac97_dai_ops = {
	.hw_params = s3c2443_ac97_hw_params,
	.trigger = s3c2443_ac97_trigger,
	};

	static struct snd_soc_dai_ops s3c2443_ac97_mic_dai_ops = {
	.hw_params = s3c2443_ac97_hw_mic_params,
	.trigger = s3c2443_ac97_mic_trigger,
	};

	struct snd_soc_dai s3c2443_ac97_dai[] = {
	{
	.name = "s3c2443-ac97",
	.id = 0,
	.ac97_control = 1,
	.probe = s3c2443_ac97_probe,
	.remove = s3c2443_ac97_remove,
	.playback = {
	.stream_name = "AC97 Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = s3c2443_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.capture = {
	.stream_name = "AC97 Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = s3c2443_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &s3c2443_ac97_dai_ops,
	},
	{
	.name = "pxa2xx-ac97-mic",
	.id = 1,
	.ac97_control = 1,
	.capture = {
	.stream_name = "AC97 Mic Capture",
	.channels_min = 1,
	.channels_max = 1,
	.rates = s3c2443_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &s3c2443_ac97_mic_dai_ops,
	},
	};
	EXPORT_SYMBOL_GPL(s3c2443_ac97_dai);
	EXPORT_SYMBOL_GPL(soc_ac97_ops);

	static int __init s3c2443_ac97_init(void)
	{
	return snd_soc_register_dais(s3c2443_ac97_dai,
	ARRAY_SIZE(s3c2443_ac97_dai));
	}
	module_init(s3c2443_ac97_init);

	static void __exit s3c2443_ac97_exit(void)
	{
	snd_soc_unregister_dais(s3c2443_ac97_dai,
	ARRAY_SIZE(s3c2443_ac97_dai));
	}
	module_exit(s3c2443_ac97_exit);


	MODULE_AUTHOR("Graeme Gregory");
	MODULE_DESCRIPTION("AC97 driver for the Samsung s3c2443 chip");
	MODULE_LICENSE("GPL");