sound/soc/samsung/ac97.c - linux - Git at Google

 /* sound/soc/samsung/ac97.c
  *
  * ALSA SoC Audio Layer - S3C AC97 Controller driver
  * 	Evolved from s3c2443-ac97.c
  *
  * Copyright (c) 2010 Samsung Electronics Co. Ltd
  *	Author: Jaswinder Singh <jassisinghbrar@gmail.com>
  * 	Credits: Graeme Gregory, Sean Choi
  *
  * 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/io.h>
 #include <linux/delay.h>
 #include <linux/clk.h>
 #include <linux/module.h>

 #include <sound/soc.h>

 #include <mach/dma.h>
 #include <plat/regs-ac97.h>
 #include <linux/platform_data/asoc-s3c.h>

 #include "dma.h"

 #define AC_CMD_ADDR(x) (x << 16)
 #define AC_CMD_DATA(x) (x & 0xffff)

 #define S3C_AC97_DAI_PCM 0
 #define S3C_AC97_DAI_MIC 1

 struct s3c_ac97_info {
 	struct clk         *ac97_clk;
 	void __iomem	   *regs;
 	struct mutex       lock;
 	struct completion  done;
 };
 static struct s3c_ac97_info s3c_ac97;

 static struct s3c2410_dma_client s3c_dma_client_out = {
 	.name = "AC97 PCMOut"
 };

 static struct s3c2410_dma_client s3c_dma_client_in = {
 	.name = "AC97 PCMIn"
 };

 static struct s3c2410_dma_client s3c_dma_client_micin = {
 	.name = "AC97 MicIn"
 };

 static struct s3c_dma_params s3c_ac97_pcm_out = {
 	.client		= &s3c_dma_client_out,
 	.dma_size	= 4,
 };

 static struct s3c_dma_params s3c_ac97_pcm_in = {
 	.client		= &s3c_dma_client_in,
 	.dma_size	= 4,
 };

 static struct s3c_dma_params s3c_ac97_mic_in = {
 	.client		= &s3c_dma_client_micin,
 	.dma_size	= 4,
 };

 static void s3c_ac97_activate(struct snd_ac97 *ac97)
 {
 	u32 ac_glbctrl, stat;

 	stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
 	if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
 		return; /* Return if already active */

 	INIT_COMPLETION(s3c_ac97.done);

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl |= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 		pr_err("AC97: Unable to activate!");
 }

 static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
 	unsigned short reg)
 {
 	u32 ac_glbctrl, ac_codec_cmd;
 	u32 stat, addr, data;

 	mutex_lock(&s3c_ac97.lock);

 	s3c_ac97_activate(ac97);

 	INIT_COMPLETION(s3c_ac97.done);

 	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 	ac_codec_cmd = S3C_AC97_CODEC_CMD_READ | AC_CMD_ADDR(reg);
 	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

 	udelay(50);

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 		pr_err("AC97: Unable to read!");

 	stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
 	addr = (stat >> 16) & 0x7f;
 	data = (stat & 0xffff);

 	if (addr != reg)
 		pr_err("ac97: req addr = %02x, rep addr = %02x\n",
 			reg, addr);

 	mutex_unlock(&s3c_ac97.lock);

 	return (unsigned short)data;
 }

 static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 	unsigned short val)
 {
 	u32 ac_glbctrl, ac_codec_cmd;

 	mutex_lock(&s3c_ac97.lock);

 	s3c_ac97_activate(ac97);

 	INIT_COMPLETION(s3c_ac97.done);

 	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 	ac_codec_cmd = AC_CMD_ADDR(reg) | AC_CMD_DATA(val);
 	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

 	udelay(50);

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl |= S3C_AC97_GLBCTRL_CODECREADYIE;
 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
 		pr_err("AC97: Unable to write!");

 	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
 	ac_codec_cmd |= S3C_AC97_CODEC_CMD_READ;
 	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

 	mutex_unlock(&s3c_ac97.lock);
 }

 static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	pr_debug("AC97: Cold reset\n");
 	writel(S3C_AC97_GLBCTRL_COLDRESET,
 			s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);
 }

 static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
 {
 	u32 stat;

 	stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
 	if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
 		return; /* Return if already active */

 	pr_debug("AC97: Warm reset\n");

 	writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	msleep(1);

 	s3c_ac97_activate(ac97);
 }

 static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
 {
 	u32 ac_glbctrl, ac_glbstat;

 	ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);

 	if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {

 		ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 		ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
 		writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 		complete(&s3c_ac97.done);
 	}

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl |= (1<<30); /* Clear interrupt */
 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 	return IRQ_HANDLED;
 }

 struct snd_ac97_bus_ops soc_ac97_ops = {
 	.read       = s3c_ac97_read,
 	.write      = s3c_ac97_write,
 	.warm_reset = s3c_ac97_warm_reset,
 	.reset      = s3c_ac97_cold_reset,
 };
 EXPORT_SYMBOL_GPL(soc_ac97_ops);

 static int s3c_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->cpu_dai;
 	struct s3c_dma_params *dma_data;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		dma_data = &s3c_ac97_pcm_out;
 	else
 		dma_data = &s3c_ac97_pcm_in;

 	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);

 	return 0;
 }

 static int s3c_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;
 	struct s3c_dma_params *dma_data =
 		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
 	else
 		ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;

 	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:
 		break;
 	}

 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 	if (!dma_data->ops)
 		dma_data->ops = samsung_dma_get_ops();

 	dma_data->ops->started(dma_data->channel);

 	return 0;
 }

 static int s3c_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->cpu_dai;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		return -ENODEV;
 	else
 		snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);

 	return 0;
 }

 static int s3c_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;
 	struct s3c_dma_params *dma_data =
 		snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

 	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
 	ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		ac_glbctrl |= S3C_AC97_GLBCTRL_MICINTM_DMA;
 		break;

 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		break;
 	}

 	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

 	if (!dma_data->ops)
 		dma_data->ops = samsung_dma_get_ops();

 	dma_data->ops->started(dma_data->channel);

 	return 0;
 }

 static const struct snd_soc_dai_ops s3c_ac97_dai_ops = {
 	.hw_params	= s3c_ac97_hw_params,
 	.trigger	= s3c_ac97_trigger,
 };

 static const struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
 	.hw_params	= s3c_ac97_hw_mic_params,
 	.trigger	= s3c_ac97_mic_trigger,
 };

 static struct snd_soc_dai_driver s3c_ac97_dai[] = {
 	[S3C_AC97_DAI_PCM] = {
 		.name =	"samsung-ac97",
 		.ac97_control = 1,
 		.playback = {
 			.stream_name = "AC97 Playback",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000_48000,
 			.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 		.capture = {
 			.stream_name = "AC97 Capture",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = SNDRV_PCM_RATE_8000_48000,
 			.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 		.ops = &s3c_ac97_dai_ops,
 	},
 	[S3C_AC97_DAI_MIC] = {
 		.name = "samsung-ac97-mic",
 		.ac97_control = 1,
 		.capture = {
 			.stream_name = "AC97 Mic Capture",
 			.channels_min = 1,
 			.channels_max = 1,
 			.rates = SNDRV_PCM_RATE_8000_48000,
 			.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 		.ops = &s3c_ac97_mic_dai_ops,
 	},
 };

 static __devinit int s3c_ac97_probe(struct platform_device *pdev)
 {
 	struct resource *mem_res, *dmatx_res, *dmarx_res, *dmamic_res, *irq_res;
 	struct s3c_audio_pdata *ac97_pdata;
 	int ret;

 	ac97_pdata = pdev->dev.platform_data;
 	if (!ac97_pdata || !ac97_pdata->cfg_gpio) {
 		dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
 		return -EINVAL;
 	}

 	/* 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 AC97-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 AC97-RX dma resource\n");
 		return -ENXIO;
 	}

 	dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
 	if (!dmamic_res) {
 		dev_err(&pdev->dev, "Unable to get AC97-MIC 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;
 	}

 	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (!irq_res) {
 		dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
 		return -ENXIO;
 	}

 	if (!request_mem_region(mem_res->start,
 				resource_size(mem_res), "ac97")) {
 		dev_err(&pdev->dev, "Unable to request register region\n");
 		return -EBUSY;
 	}

 	s3c_ac97_pcm_out.channel = dmatx_res->start;
 	s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
 	s3c_ac97_pcm_in.channel = dmarx_res->start;
 	s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
 	s3c_ac97_mic_in.channel = dmamic_res->start;
 	s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;

 	init_completion(&s3c_ac97.done);
 	mutex_init(&s3c_ac97.lock);

 	s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
 	if (s3c_ac97.regs == NULL) {
 		dev_err(&pdev->dev, "Unable to ioremap register region\n");
 		ret = -ENXIO;
 		goto err1;
 	}

 	s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
 	if (IS_ERR(s3c_ac97.ac97_clk)) {
 		dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
 		ret = -ENODEV;
 		goto err2;
 	}
 	clk_enable(s3c_ac97.ac97_clk);

 	if (ac97_pdata->cfg_gpio(pdev)) {
 		dev_err(&pdev->dev, "Unable to configure gpio\n");
 		ret = -EINVAL;
 		goto err3;
 	}

 	ret = request_irq(irq_res->start, s3c_ac97_irq,
 					0, "AC97", NULL);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
 		goto err4;
 	}

 	ret = snd_soc_register_dais(&pdev->dev, s3c_ac97_dai,
 			ARRAY_SIZE(s3c_ac97_dai));
 	if (ret)
 		goto err5;

 	return 0;

 err5:
 	free_irq(irq_res->start, NULL);
 err4:
 err3:
 	clk_disable(s3c_ac97.ac97_clk);
 	clk_put(s3c_ac97.ac97_clk);
 err2:
 	iounmap(s3c_ac97.regs);
 err1:
 	release_mem_region(mem_res->start, resource_size(mem_res));

 	return ret;
 }

 static __devexit int s3c_ac97_remove(struct platform_device *pdev)
 {
 	struct resource *mem_res, *irq_res;

 	snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(s3c_ac97_dai));

 	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (irq_res)
 		free_irq(irq_res->start, NULL);

 	clk_disable(s3c_ac97.ac97_clk);
 	clk_put(s3c_ac97.ac97_clk);

 	iounmap(s3c_ac97.regs);

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

 	return 0;
 }

 static struct platform_driver s3c_ac97_driver = {
 	.probe  = s3c_ac97_probe,
 	.remove = __devexit_p(s3c_ac97_remove),
 	.driver = {
 		.name = "samsung-ac97",
 		.owner = THIS_MODULE,
 	},
 };

 module_platform_driver(s3c_ac97_driver);

 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
 MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:samsung-ac97");
	/* sound/soc/samsung/ac97.c
	*
	* ALSA SoC Audio Layer - S3C AC97 Controller driver
	* Evolved from s3c2443-ac97.c
	*
	* Copyright (c) 2010 Samsung Electronics Co. Ltd
	* Author: Jaswinder Singh <jassisinghbrar@gmail.com>
	* Credits: Graeme Gregory, Sean Choi
	*
	* 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/io.h>
	#include <linux/delay.h>
	#include <linux/clk.h>
	#include <linux/module.h>

	#include <sound/soc.h>

	#include <mach/dma.h>
	#include <plat/regs-ac97.h>
	#include <linux/platform_data/asoc-s3c.h>

	#include "dma.h"

	#define AC_CMD_ADDR(x) (x << 16)
	#define AC_CMD_DATA(x) (x & 0xffff)

	#define S3C_AC97_DAI_PCM 0
	#define S3C_AC97_DAI_MIC 1

	struct s3c_ac97_info {
	struct clk *ac97_clk;
	void __iomem *regs;
	struct mutex lock;
	struct completion done;
	};
	static struct s3c_ac97_info s3c_ac97;

	static struct s3c2410_dma_client s3c_dma_client_out = {
	.name = "AC97 PCMOut"
	};

	static struct s3c2410_dma_client s3c_dma_client_in = {
	.name = "AC97 PCMIn"
	};

	static struct s3c2410_dma_client s3c_dma_client_micin = {
	.name = "AC97 MicIn"
	};

	static struct s3c_dma_params s3c_ac97_pcm_out = {
	.client = &s3c_dma_client_out,
	.dma_size = 4,
	};

	static struct s3c_dma_params s3c_ac97_pcm_in = {
	.client = &s3c_dma_client_in,
	.dma_size = 4,
	};

	static struct s3c_dma_params s3c_ac97_mic_in = {
	.client = &s3c_dma_client_micin,
	.dma_size = 4,
	};

	static void s3c_ac97_activate(struct snd_ac97 *ac97)
	{
	u32 ac_glbctrl, stat;

	stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
	if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
	return; /* Return if already active */

	INIT_COMPLETION(s3c_ac97.done);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl = S3C_AC97_GLBCTRL_ACLINKON;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl \|= S3C_AC97_GLBCTRL_TRANSFERDATAENABLE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl \|= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
	pr_err("AC97: Unable to activate!");
	}

	static unsigned short s3c_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
	{
	u32 ac_glbctrl, ac_codec_cmd;
	u32 stat, addr, data;

	mutex_lock(&s3c_ac97.lock);

	s3c_ac97_activate(ac97);

	INIT_COMPLETION(s3c_ac97.done);

	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd = S3C_AC97_CODEC_CMD_READ \| AC_CMD_ADDR(reg);
	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

	udelay(50);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl \|= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
	pr_err("AC97: Unable to read!");

	stat = readl(s3c_ac97.regs + S3C_AC97_STAT);
	addr = (stat >> 16) & 0x7f;
	data = (stat & 0xffff);

	if (addr != reg)
	pr_err("ac97: req addr = %02x, rep addr = %02x\n",
	reg, addr);

	mutex_unlock(&s3c_ac97.lock);

	return (unsigned short)data;
	}

	static void s3c_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
	{
	u32 ac_glbctrl, ac_codec_cmd;

	mutex_lock(&s3c_ac97.lock);

	s3c_ac97_activate(ac97);

	INIT_COMPLETION(s3c_ac97.done);

	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd = AC_CMD_ADDR(reg) \| AC_CMD_DATA(val);
	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

	udelay(50);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl \|= S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!wait_for_completion_timeout(&s3c_ac97.done, HZ))
	pr_err("AC97: Unable to write!");

	ac_codec_cmd = readl(s3c_ac97.regs + S3C_AC97_CODEC_CMD);
	ac_codec_cmd \|= S3C_AC97_CODEC_CMD_READ;
	writel(ac_codec_cmd, s3c_ac97.regs + S3C_AC97_CODEC_CMD);

	mutex_unlock(&s3c_ac97.lock);
	}

	static void s3c_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	pr_debug("AC97: Cold reset\n");
	writel(S3C_AC97_GLBCTRL_COLDRESET,
	s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);
	}

	static void s3c_ac97_warm_reset(struct snd_ac97 *ac97)
	{
	u32 stat;

	stat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT) & 0x7;
	if (stat == S3C_AC97_GLBSTAT_MAINSTATE_ACTIVE)
	return; /* Return if already active */

	pr_debug("AC97: Warm reset\n");

	writel(S3C_AC97_GLBCTRL_WARMRESET, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	writel(0, s3c_ac97.regs + S3C_AC97_GLBCTRL);
	msleep(1);

	s3c_ac97_activate(ac97);
	}

	static irqreturn_t s3c_ac97_irq(int irq, void *dev_id)
	{
	u32 ac_glbctrl, ac_glbstat;

	ac_glbstat = readl(s3c_ac97.regs + S3C_AC97_GLBSTAT);

	if (ac_glbstat & S3C_AC97_GLBSTAT_CODECREADY) {

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_CODECREADYIE;
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	complete(&s3c_ac97.done);
	}

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl \|= (1<<30); /* Clear interrupt */
	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	return IRQ_HANDLED;
	}

	struct snd_ac97_bus_ops soc_ac97_ops = {
	.read = s3c_ac97_read,
	.write = s3c_ac97_write,
	.warm_reset = s3c_ac97_warm_reset,
	.reset = s3c_ac97_cold_reset,
	};
	EXPORT_SYMBOL_GPL(soc_ac97_ops);

	static int s3c_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->cpu_dai;
	struct s3c_dma_params *dma_data;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	dma_data = &s3c_ac97_pcm_out;
	else
	dma_data = &s3c_ac97_pcm_in;

	snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);

	return 0;
	}

	static int s3c_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;
	struct s3c_dma_params *dma_data =
	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMINTM_MASK;
	else
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_PCMOUTTM_MASK;

	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:
	break;
	}

	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!dma_data->ops)
	dma_data->ops = samsung_dma_get_ops();

	dma_data->ops->started(dma_data->channel);

	return 0;
	}

	static int s3c_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->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	return -ENODEV;
	else
	snd_soc_dai_set_dma_data(cpu_dai, substream, &s3c_ac97_mic_in);

	return 0;
	}

	static int s3c_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;
	struct s3c_dma_params *dma_data =
	snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	ac_glbctrl = readl(s3c_ac97.regs + S3C_AC97_GLBCTRL);
	ac_glbctrl &= ~S3C_AC97_GLBCTRL_MICINTM_MASK;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	ac_glbctrl \|= S3C_AC97_GLBCTRL_MICINTM_DMA;
	break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	break;
	}

	writel(ac_glbctrl, s3c_ac97.regs + S3C_AC97_GLBCTRL);

	if (!dma_data->ops)
	dma_data->ops = samsung_dma_get_ops();

	dma_data->ops->started(dma_data->channel);

	return 0;
	}

	static const struct snd_soc_dai_ops s3c_ac97_dai_ops = {
	.hw_params = s3c_ac97_hw_params,
	.trigger = s3c_ac97_trigger,
	};

	static const struct snd_soc_dai_ops s3c_ac97_mic_dai_ops = {
	.hw_params = s3c_ac97_hw_mic_params,
	.trigger = s3c_ac97_mic_trigger,
	};

	static struct snd_soc_dai_driver s3c_ac97_dai[] = {
	[S3C_AC97_DAI_PCM] = {
	.name = "samsung-ac97",
	.ac97_control = 1,
	.playback = {
	.stream_name = "AC97 Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.capture = {
	.stream_name = "AC97 Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &s3c_ac97_dai_ops,
	},
	[S3C_AC97_DAI_MIC] = {
	.name = "samsung-ac97-mic",
	.ac97_control = 1,
	.capture = {
	.stream_name = "AC97 Mic Capture",
	.channels_min = 1,
	.channels_max = 1,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = &s3c_ac97_mic_dai_ops,
	},
	};

	static __devinit int s3c_ac97_probe(struct platform_device *pdev)
	{
	struct resource mem_res, dmatx_res, dmarx_res, dmamic_res, *irq_res;
	struct s3c_audio_pdata *ac97_pdata;
	int ret;

	ac97_pdata = pdev->dev.platform_data;
	if (!ac97_pdata \|\| !ac97_pdata->cfg_gpio) {
	dev_err(&pdev->dev, "cfg_gpio callback not provided!\n");
	return -EINVAL;
	}

	/* 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 AC97-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 AC97-RX dma resource\n");
	return -ENXIO;
	}

	dmamic_res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
	if (!dmamic_res) {
	dev_err(&pdev->dev, "Unable to get AC97-MIC 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;
	}

	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq_res) {
	dev_err(&pdev->dev, "AC97 IRQ not provided!\n");
	return -ENXIO;
	}

	if (!request_mem_region(mem_res->start,
	resource_size(mem_res), "ac97")) {
	dev_err(&pdev->dev, "Unable to request register region\n");
	return -EBUSY;
	}

	s3c_ac97_pcm_out.channel = dmatx_res->start;
	s3c_ac97_pcm_out.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
	s3c_ac97_pcm_in.channel = dmarx_res->start;
	s3c_ac97_pcm_in.dma_addr = mem_res->start + S3C_AC97_PCM_DATA;
	s3c_ac97_mic_in.channel = dmamic_res->start;
	s3c_ac97_mic_in.dma_addr = mem_res->start + S3C_AC97_MIC_DATA;

	init_completion(&s3c_ac97.done);
	mutex_init(&s3c_ac97.lock);

	s3c_ac97.regs = ioremap(mem_res->start, resource_size(mem_res));
	if (s3c_ac97.regs == NULL) {
	dev_err(&pdev->dev, "Unable to ioremap register region\n");
	ret = -ENXIO;
	goto err1;
	}

	s3c_ac97.ac97_clk = clk_get(&pdev->dev, "ac97");
	if (IS_ERR(s3c_ac97.ac97_clk)) {
	dev_err(&pdev->dev, "ac97 failed to get ac97_clock\n");
	ret = -ENODEV;
	goto err2;
	}
	clk_enable(s3c_ac97.ac97_clk);

	if (ac97_pdata->cfg_gpio(pdev)) {
	dev_err(&pdev->dev, "Unable to configure gpio\n");
	ret = -EINVAL;
	goto err3;
	}

	ret = request_irq(irq_res->start, s3c_ac97_irq,
	0, "AC97", NULL);
	if (ret < 0) {
	dev_err(&pdev->dev, "ac97: interrupt request failed.\n");
	goto err4;
	}

	ret = snd_soc_register_dais(&pdev->dev, s3c_ac97_dai,
	ARRAY_SIZE(s3c_ac97_dai));
	if (ret)
	goto err5;

	return 0;

	err5:
	free_irq(irq_res->start, NULL);
	err4:
	err3:
	clk_disable(s3c_ac97.ac97_clk);
	clk_put(s3c_ac97.ac97_clk);
	err2:
	iounmap(s3c_ac97.regs);
	err1:
	release_mem_region(mem_res->start, resource_size(mem_res));

	return ret;
	}

	static __devexit int s3c_ac97_remove(struct platform_device *pdev)
	{
	struct resource mem_res, irq_res;

	snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(s3c_ac97_dai));

	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (irq_res)
	free_irq(irq_res->start, NULL);

	clk_disable(s3c_ac97.ac97_clk);
	clk_put(s3c_ac97.ac97_clk);

	iounmap(s3c_ac97.regs);

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

	return 0;
	}

	static struct platform_driver s3c_ac97_driver = {
	.probe = s3c_ac97_probe,
	.remove = __devexit_p(s3c_ac97_remove),
	.driver = {
	.name = "samsung-ac97",
	.owner = THIS_MODULE,
	},
	};

	module_platform_driver(s3c_ac97_driver);

	MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
	MODULE_DESCRIPTION("AC97 driver for the Samsung SoC");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:samsung-ac97");