sound/soc/nuc900/nuc900-ac97.c - kernel/quantenna - Git at Google

 /*
  * Copyright (c) 2009-2010 Nuvoton technology corporation.
  *
  * Wan ZongShun <mcuos.com@gmail.com>
  *
  * 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;version 2 of the License.
  *
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <linux/suspend.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/initval.h>
 #include <sound/soc.h>
 #include <linux/clk.h>

 #include <mach/mfp.h>

 #include "nuc900-audio.h"

 static DEFINE_MUTEX(ac97_mutex);
 struct nuc900_audio *nuc900_ac97_data;
 EXPORT_SYMBOL_GPL(nuc900_ac97_data);

 static int nuc900_checkready(void)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

 	if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
 		return -EPERM;

 	return 0;
 }

 /* AC97 controller reads codec register */
 static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
 					unsigned short reg)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 	unsigned long timeout = 0x10000, val;

 	mutex_lock(&ac97_mutex);

 	val = nuc900_checkready();
 	if (val) {
 		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
 		goto out;
 	}

 	/* set the R_WB bit and write register index */
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg);

 	/* set the valid frame bit and valid slots */
 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 	val |= (VALID_FRAME | SLOT1_VALID);
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);

 	udelay(100);

 	/* polling the AC_R_FINISH */
 	while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
 								&& timeout--)
 		mdelay(1);

 	if (!timeout) {
 		dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
 		val = -EPERM;
 		goto out;
 	}

 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
 	val &= ~SLOT1_VALID;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);

 	if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
 		dev_err(nuc900_audio->dev,
 				"R_INDEX of REG_ACTL_ACIS1 not match!\n");
 	}

 	udelay(100);
 	val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);

 out:
 	mutex_unlock(&ac97_mutex);
 	return val;
 }

 /* AC97 controller writes to codec register */
 static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 				unsigned short val)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 	unsigned long tmp, timeout = 0x10000;

 	mutex_lock(&ac97_mutex);

 	tmp = nuc900_checkready();
 	if (tmp)
 		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");

 	/* clear the R_WB bit and write register index */
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);

 	/* write register value */
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);

 	/* set the valid frame bit and valid slots */
 	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 	tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

 	udelay(100);

 	/* polling the AC_W_FINISH */
 	while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
 								&& timeout--)
 		mdelay(1);

 	if (!timeout)
 		dev_err(nuc900_audio->dev, "AC97 write register time out !\n");

 	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 	tmp &= ~(SLOT1_VALID | SLOT2_VALID);
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

 	mutex_unlock(&ac97_mutex);

 }

 static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 	unsigned long val;

 	mutex_lock(&ac97_mutex);

 	/* warm reset AC 97 */
 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
 	val |= AC_W_RES;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

 	udelay(100);

 	val = nuc900_checkready();
 	if (val)
 		dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");

 	mutex_unlock(&ac97_mutex);
 }

 static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 	unsigned long val;

 	mutex_lock(&ac97_mutex);

 	/* reset Audio Controller */
 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 	val |= ACTL_RESET_BIT;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 	val &= (~ACTL_RESET_BIT);
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

 	/* reset AC-link interface */

 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 	val |= AC_RESET;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 	val &= ~AC_RESET;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

 	/* cold reset AC 97 */
 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
 	val |= AC_C_RES;
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
 	val &= (~AC_C_RES);
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

 	udelay(100);

 	mutex_unlock(&ac97_mutex);

 }

 /* AC97 controller operations */
 static struct snd_ac97_bus_ops nuc900_ac97_ops = {
 	.read		= nuc900_ac97_read,
 	.write		= nuc900_ac97_write,
 	.reset		= nuc900_ac97_cold_reset,
 	.warm_reset	= nuc900_ac97_warm_reset,
 };

 static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
 				int cmd, struct snd_soc_dai *dai)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 	int ret;
 	unsigned long val, tmp;

 	ret = 0;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 			tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME);
 			AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

 			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
 			tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ);
 			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
 			val |= AC_PLAY;
 		} else {
 			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
 			tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ);

 			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
 			val |= AC_RECORD;
 		}

 		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
 			tmp &= ~(SLOT3_VALID | SLOT4_VALID);
 			AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

 			AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
 			val &= ~AC_PLAY;
 		} else {
 			AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
 			val &= ~AC_RECORD;
 		}

 		AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static int nuc900_ac97_probe(struct snd_soc_dai *dai)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
 	unsigned long val;

 	mutex_lock(&ac97_mutex);

 	/* enable unit clock */
 	clk_enable(nuc900_audio->clk);

 	/* enable audio controller and AC-link interface */
 	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
 	val |= (IIS_AC_PIN_SEL | ACLINK_EN);
 	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);

 	mutex_unlock(&ac97_mutex);

 	return 0;
 }

 static int nuc900_ac97_remove(struct snd_soc_dai *dai)
 {
 	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

 	clk_disable(nuc900_audio->clk);
 	return 0;
 }

 static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
 	.trigger	= nuc900_ac97_trigger,
 };

 static struct snd_soc_dai_driver nuc900_ac97_dai = {
 	.probe			= nuc900_ac97_probe,
 	.remove			= nuc900_ac97_remove,
 	.bus_control		= true,
 	.playback = {
 		.rates		= SNDRV_PCM_RATE_8000_48000,
 		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
 		.channels_min	= 1,
 		.channels_max	= 2,
 	},
 	.capture = {
 		.rates		= SNDRV_PCM_RATE_8000_48000,
 		.formats	= SNDRV_PCM_FMTBIT_S16_LE,
 		.channels_min	= 1,
 		.channels_max	= 2,
 	},
 	.ops = &nuc900_ac97_dai_ops,
 };

 static const struct snd_soc_component_driver nuc900_ac97_component = {
 	.name		= "nuc900-ac97",
 };

 static int nuc900_ac97_drvprobe(struct platform_device *pdev)
 {
 	struct nuc900_audio *nuc900_audio;
 	int ret;

 	if (nuc900_ac97_data)
 		return -EBUSY;

 	nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
 				    GFP_KERNEL);
 	if (!nuc900_audio)
 		return -ENOMEM;

 	spin_lock_init(&nuc900_audio->lock);

 	nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
 						   nuc900_audio->res);
 	if (IS_ERR(nuc900_audio->mmio))
 		return PTR_ERR(nuc900_audio->mmio);

 	nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(nuc900_audio->clk)) {
 		ret = PTR_ERR(nuc900_audio->clk);
 		goto out;
 	}

 	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
 	if (!nuc900_audio->irq_num) {
 		ret = -EBUSY;
 		goto out;
 	}

 	nuc900_ac97_data = nuc900_audio;

 	ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
 	if (ret)
 		goto out;

 	ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
 					 &nuc900_ac97_dai, 1);
 	if (ret)
 		goto out;

 	/* enbale ac97 multifunction pin */
 	mfp_set_groupg(nuc900_audio->dev, NULL);

 	return 0;

 out:
 	snd_soc_set_ac97_ops(NULL);
 	return ret;
 }

 static int nuc900_ac97_drvremove(struct platform_device *pdev)
 {
 	snd_soc_unregister_component(&pdev->dev);

 	nuc900_ac97_data = NULL;
 	snd_soc_set_ac97_ops(NULL);

 	return 0;
 }

 static struct platform_driver nuc900_ac97_driver = {
 	.driver	= {
 		.name	= "nuc900-ac97",
 	},
 	.probe		= nuc900_ac97_drvprobe,
 	.remove		= nuc900_ac97_drvremove,
 };

 module_platform_driver(nuc900_ac97_driver);

 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:nuc900-ac97");
	/*
	* Copyright (c) 2009-2010 Nuvoton technology corporation.
	*
	* Wan ZongShun <mcuos.com@gmail.com>
	*
	* 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;version 2 of the License.
	*
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/device.h>
	#include <linux/delay.h>
	#include <linux/mutex.h>
	#include <linux/suspend.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/initval.h>
	#include <sound/soc.h>
	#include <linux/clk.h>

	#include <mach/mfp.h>

	#include "nuc900-audio.h"

	static DEFINE_MUTEX(ac97_mutex);
	struct nuc900_audio *nuc900_ac97_data;
	EXPORT_SYMBOL_GPL(nuc900_ac97_data);

	static int nuc900_checkready(void)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

	if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
	return -EPERM;

	return 0;
	}

	/* AC97 controller reads codec register */
	static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long timeout = 0x10000, val;

	mutex_lock(&ac97_mutex);

	val = nuc900_checkready();
	if (val) {
	dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
	goto out;
	}

	/* set the R_WB bit and write register index */
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB \| reg);

	/* set the valid frame bit and valid slots */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	val \|= (VALID_FRAME \| SLOT1_VALID);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);

	udelay(100);

	/* polling the AC_R_FINISH */
	while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
	&& timeout--)
	mdelay(1);

	if (!timeout) {
	dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
	val = -EPERM;
	goto out;
	}

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
	val &= ~SLOT1_VALID;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);

	if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
	dev_err(nuc900_audio->dev,
	"R_INDEX of REG_ACTL_ACIS1 not match!\n");
	}

	udelay(100);
	val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);

	out:
	mutex_unlock(&ac97_mutex);
	return val;
	}

	/* AC97 controller writes to codec register */
	static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long tmp, timeout = 0x10000;

	mutex_lock(&ac97_mutex);

	tmp = nuc900_checkready();
	if (tmp)
	dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");

	/* clear the R_WB bit and write register index */
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);

	/* write register value */
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);

	/* set the valid frame bit and valid slots */
	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	tmp \|= SLOT1_VALID \| SLOT2_VALID \| VALID_FRAME;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

	udelay(100);

	/* polling the AC_W_FINISH */
	while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
	&& timeout--)
	mdelay(1);

	if (!timeout)
	dev_err(nuc900_audio->dev, "AC97 write register time out !\n");

	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	tmp &= ~(SLOT1_VALID \| SLOT2_VALID);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

	mutex_unlock(&ac97_mutex);

	}

	static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long val;

	mutex_lock(&ac97_mutex);

	/* warm reset AC 97 */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	val \|= AC_W_RES;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

	udelay(100);

	val = nuc900_checkready();
	if (val)
	dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");

	mutex_unlock(&ac97_mutex);
	}

	static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long val;

	mutex_lock(&ac97_mutex);

	/* reset Audio Controller */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val \|= ACTL_RESET_BIT;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val &= (~ACTL_RESET_BIT);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	/* reset AC-link interface */

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val \|= AC_RESET;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	val &= ~AC_RESET;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	/* cold reset AC 97 */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	val \|= AC_C_RES;
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	val &= (~AC_C_RES);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);

	udelay(100);

	mutex_unlock(&ac97_mutex);

	}

	/* AC97 controller operations */
	static struct snd_ac97_bus_ops nuc900_ac97_ops = {
	.read = nuc900_ac97_read,
	.write = nuc900_ac97_write,
	.reset = nuc900_ac97_cold_reset,
	.warm_reset = nuc900_ac97_warm_reset,
	};

	static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
	int cmd, struct snd_soc_dai *dai)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	int ret;
	unsigned long val, tmp;

	ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	tmp \|= (SLOT3_VALID \| SLOT4_VALID \| VALID_FRAME);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
	tmp \|= (P_DMA_END_IRQ \| P_DMA_MIDDLE_IRQ);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
	val \|= AC_PLAY;
	} else {
	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
	tmp \|= (R_DMA_END_IRQ \| R_DMA_MIDDLE_IRQ);

	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
	val \|= AC_RECORD;
	}

	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	tmp &= ~(SLOT3_VALID \| SLOT4_VALID);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);

	AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
	val &= ~AC_PLAY;
	} else {
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
	val &= ~AC_RECORD;
	}

	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);

	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static int nuc900_ac97_probe(struct snd_soc_dai *dai)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	unsigned long val;

	mutex_lock(&ac97_mutex);

	/* enable unit clock */
	clk_enable(nuc900_audio->clk);

	/* enable audio controller and AC-link interface */
	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
	val \|= (IIS_AC_PIN_SEL \| ACLINK_EN);
	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);

	mutex_unlock(&ac97_mutex);

	return 0;
	}

	static int nuc900_ac97_remove(struct snd_soc_dai *dai)
	{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

	clk_disable(nuc900_audio->clk);
	return 0;
	}

	static const struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
	.trigger = nuc900_ac97_trigger,
	};

	static struct snd_soc_dai_driver nuc900_ac97_dai = {
	.probe = nuc900_ac97_probe,
	.remove = nuc900_ac97_remove,
	.bus_control = true,
	.playback = {
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.channels_min = 1,
	.channels_max = 2,
	},
	.capture = {
	.rates = SNDRV_PCM_RATE_8000_48000,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.channels_min = 1,
	.channels_max = 2,
	},
	.ops = &nuc900_ac97_dai_ops,
	};

	static const struct snd_soc_component_driver nuc900_ac97_component = {
	.name = "nuc900-ac97",
	};

	static int nuc900_ac97_drvprobe(struct platform_device *pdev)
	{
	struct nuc900_audio *nuc900_audio;
	int ret;

	if (nuc900_ac97_data)
	return -EBUSY;

	nuc900_audio = devm_kzalloc(&pdev->dev, sizeof(struct nuc900_audio),
	GFP_KERNEL);
	if (!nuc900_audio)
	return -ENOMEM;

	spin_lock_init(&nuc900_audio->lock);

	nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	nuc900_audio->mmio = devm_ioremap_resource(&pdev->dev,
	nuc900_audio->res);
	if (IS_ERR(nuc900_audio->mmio))
	return PTR_ERR(nuc900_audio->mmio);

	nuc900_audio->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(nuc900_audio->clk)) {
	ret = PTR_ERR(nuc900_audio->clk);
	goto out;
	}

	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
	if (!nuc900_audio->irq_num) {
	ret = -EBUSY;
	goto out;
	}

	nuc900_ac97_data = nuc900_audio;

	ret = snd_soc_set_ac97_ops(&nuc900_ac97_ops);
	if (ret)
	goto out;

	ret = snd_soc_register_component(&pdev->dev, &nuc900_ac97_component,
	&nuc900_ac97_dai, 1);
	if (ret)
	goto out;

	/* enbale ac97 multifunction pin */
	mfp_set_groupg(nuc900_audio->dev, NULL);

	return 0;

	out:
	snd_soc_set_ac97_ops(NULL);
	return ret;
	}

	static int nuc900_ac97_drvremove(struct platform_device *pdev)
	{
	snd_soc_unregister_component(&pdev->dev);

	nuc900_ac97_data = NULL;
	snd_soc_set_ac97_ops(NULL);

	return 0;
	}

	static struct platform_driver nuc900_ac97_driver = {
	.driver = {
	.name = "nuc900-ac97",
	},
	.probe = nuc900_ac97_drvprobe,
	.remove = nuc900_ac97_drvremove,
	};

	module_platform_driver(nuc900_ac97_driver);

	MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
	MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:nuc900-ac97");