[mirror_ubuntu-bionic-kernel.git] / sound / soc / nuc900 / nuc900-ac97.c

/*
 * 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/device.h>
#include <linux/clk.h>

#include <mach/mfp.h>

#include "nuc900-audio.h"

static DEFINE_MUTEX(ac97_mutex);
struct nuc900_audio *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 */
struct snd_ac97_bus_ops soc_ac97_ops = {
	.read		= nuc900_ac97_read,
	.write		= nuc900_ac97_write,
	.reset		= nuc900_ac97_cold_reset,
	.warm_reset	= nuc900_ac97_warm_reset,
}
EXPORT_SYMBOL_GPL(soc_ac97_ops);

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 platform_device *pdev,
					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 void nuc900_ac97_remove(struct platform_device *pdev,
						struct snd_soc_dai *dai)
{
	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;

	clk_disable(nuc900_audio->clk);
}

static 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,
	.ac97_control		= 1,
	.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 int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev)
{
	struct nuc900_audio *nuc900_audio;
	int ret;

	if (nuc900_ac97_data)
		return -EBUSY;

	nuc900_audio = kzalloc(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);
	if (!nuc900_audio->res) {
		ret = -ENODEV;
		goto out0;
	}

	if (!request_mem_region(nuc900_audio->res->start,
			resource_size(nuc900_audio->res), pdev->name)) {
		ret = -EBUSY;
		goto out0;
	}

	nuc900_audio->mmio = ioremap(nuc900_audio->res->start,
					resource_size(nuc900_audio->res));
	if (!nuc900_audio->mmio) {
		ret = -ENOMEM;
		goto out1;
	}

	nuc900_audio->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(nuc900_audio->clk)) {
		ret = PTR_ERR(nuc900_audio->clk);
		goto out2;
	}

	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
	if (!nuc900_audio->irq_num) {
		ret = -EBUSY;
		goto out2;
	}

	nuc900_ac97_data = nuc900_audio;

	ret = snd_soc_register_dai(&pdev->dev, &nuc900_ac97_dai);
	if (ret)
		goto out3;

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

	return 0;

out3:
	clk_put(nuc900_audio->clk);
out2:
	iounmap(nuc900_audio->mmio);
out1:
	release_mem_region(nuc900_audio->res->start,
					resource_size(nuc900_audio->res));
out0:
	kfree(nuc900_audio);
	return ret;
}

static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev)
{

	snd_soc_unregister_dai(&pdev->dev);

	clk_put(nuc900_ac97_data->clk);
	iounmap(nuc900_ac97_data->mmio);
	release_mem_region(nuc900_ac97_data->res->start,
				resource_size(nuc900_ac97_data->res));

	nuc900_ac97_data = NULL;

	return 0;
}

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

static int __init nuc900_ac97_init(void)
{
	return platform_driver_register(&nuc900_ac97_driver);
}

static void __exit nuc900_ac97_exit(void)
{
	platform_driver_unregister(&nuc900_ac97_driver);
}

module_init(nuc900_ac97_init);
module_exit(nuc900_ac97_exit);

MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-ac97");
Commit	Line	Data
1082e270 WZ	1	/*
	2	* Copyright (c) 2009-2010 Nuvoton technology corporation.
	3	*
	4	* Wan ZongShun <mcuos.com@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation;version 2 of the License.
	9	*
	10	*/
	11
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/slab.h>
	15	#include <linux/device.h>
	16	#include <linux/delay.h>
	17	#include <linux/mutex.h>
	18	#include <linux/suspend.h>
	19	#include <sound/core.h>
	20	#include <sound/pcm.h>
	21	#include <sound/initval.h>
	22	#include <sound/soc.h>
	23	#include <linux/device.h>
	24	#include <linux/clk.h>
	25
	26	#include <mach/mfp.h>
	27
0dc3b442	28	#include "nuc900-audio.h"
1082e270 WZ	29
	30	static DEFINE_MUTEX(ac97_mutex);
	31	struct nuc900_audio *nuc900_ac97_data;
	32
	33	static int nuc900_checkready(void)
	34	{
	35	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	36
	37	if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY))
	38	return -EPERM;
	39
	40	return 0;
	41	}
	42
	43	/* AC97 controller reads codec register */
	44	static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97,
	45	unsigned short reg)
	46	{
	47	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	48	unsigned long timeout = 0x10000, val;
	49
	50	mutex_lock(&ac97_mutex);
	51
	52	val = nuc900_checkready();
	53	if (!!val) {
	54	dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
	55	goto out;
	56	}
	57
	58	/* set the R_WB bit and write register index */
	59	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB \| reg);
	60
	61	/* set the valid frame bit and valid slots */
	62	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	63	val \|= (VALID_FRAME \| SLOT1_VALID);
	64	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
	65
	66	udelay(100);
	67
	68	/* polling the AC_R_FINISH */
8dfb0c78 WZ	69	while (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_R_FINISH)
8dfb0c78 WZ	70	&& timeout--)
1082e270 WZ	71	mdelay(1);
	72
	73	if (!timeout) {
	74	dev_err(nuc900_audio->dev, "AC97 read register time out !\n");
	75	val = -EPERM;
	76	goto out;
	77	}
	78
	79	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ;
	80	val &= ~SLOT1_VALID;
	81	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val);
	82
	83	if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) {
	84	dev_err(nuc900_audio->dev,
	85	"R_INDEX of REG_ACTL_ACIS1 not match!\n");
	86	}
	87
	88	udelay(100);
	89	val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF);
	90
	91	out:
	92	mutex_unlock(&ac97_mutex);
	93	return val;
	94	}
	95
	96	/* AC97 controller writes to codec register */
	97	static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	98	unsigned short val)
	99	{
	100	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	101	unsigned long tmp, timeout = 0x10000;
	102
	103	mutex_lock(&ac97_mutex);
	104
	105	tmp = nuc900_checkready();
	106	if (!!tmp)
	107	dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
	108
	109	/* clear the R_WB bit and write register index */
	110	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg);
	111
	112	/* write register value */
	113	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val);
	114
	115	/* set the valid frame bit and valid slots */
	116	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	117	tmp \|= SLOT1_VALID \| SLOT2_VALID \| VALID_FRAME;
	118	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
	119
	120	udelay(100);
	121
	122	/* polling the AC_W_FINISH */
8dfb0c78 WZ	123	while ((AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON) & AC_W_FINISH)
8dfb0c78 WZ	124	&& timeout--)
1082e270 WZ	125	mdelay(1);
	126
	127	if (!timeout)
	128	dev_err(nuc900_audio->dev, "AC97 write register time out !\n");
	129
	130	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	131	tmp &= ~(SLOT1_VALID \| SLOT2_VALID);
	132	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
	133
	134	mutex_unlock(&ac97_mutex);
	135
	136	}
	137
	138	static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97)
	139	{
	140	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	141	unsigned long val;
	142
	143	mutex_lock(&ac97_mutex);
	144
	145	/* warm reset AC 97 */
	146	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	147	val \|= AC_W_RES;
	148	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
	149
08a0b717	150	udelay(100);
1082e270 WZ	151
	152	val = nuc900_checkready();
	153	if (!!val)
	154	dev_err(nuc900_audio->dev, "AC97 codec is not ready\n");
	155
	156	mutex_unlock(&ac97_mutex);
	157	}
	158
	159	static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97)
	160	{
	161	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	162	unsigned long val;
	163
	164	mutex_lock(&ac97_mutex);
	165
	166	/* reset Audio Controller */
	167	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	168	val \|= ACTL_RESET_BIT;
	169	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
	170
1082e270 WZ	171	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	172	val &= (~ACTL_RESET_BIT);
	173	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
	174
1082e270 WZ	175	/* reset AC-link interface */
	176
	177	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	178	val \|= AC_RESET;
	179	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
	180
1082e270 WZ	181	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
	182	val &= ~AC_RESET;
	183	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
	184
1082e270 WZ	185	/* cold reset AC 97 */
	186	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	187	val \|= AC_C_RES;
	188	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
	189
1082e270 WZ	190	val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON);
	191	val &= (~AC_C_RES);
	192	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val);
	193
08a0b717	194	udelay(100);
1082e270 WZ	195
	196	mutex_unlock(&ac97_mutex);
	197
	198	}
	199
	200	/* AC97 controller operations */
	201	struct snd_ac97_bus_ops soc_ac97_ops = {
	202	.read = nuc900_ac97_read,
	203	.write = nuc900_ac97_write,
	204	.reset = nuc900_ac97_cold_reset,
	205	.warm_reset = nuc900_ac97_warm_reset,
	206	}
	207	EXPORT_SYMBOL_GPL(soc_ac97_ops);
	208
	209	static int nuc900_ac97_trigger(struct snd_pcm_substream *substream,
	210	int cmd, struct snd_soc_dai *dai)
	211	{
	212	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
018334c0	213	int ret;
1082e270 WZ	214	unsigned long val, tmp;
	215
	216	ret = 0;
	217
	218	switch (cmd) {
	219	case SNDRV_PCM_TRIGGER_START:
	220	case SNDRV_PCM_TRIGGER_RESUME:
	221	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
018334c0	222	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1082e270 WZ	223	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	224	tmp \|= (SLOT3_VALID \| SLOT4_VALID \| VALID_FRAME);
	225	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
	226
	227	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR);
	228	tmp \|= (P_DMA_END_IRQ \| P_DMA_MIDDLE_IRQ);
	229	AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp);
	230	val \|= AC_PLAY;
	231	} else {
	232	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR);
	233	tmp \|= (R_DMA_END_IRQ \| R_DMA_MIDDLE_IRQ);
	234
	235	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp);
	236	val \|= AC_RECORD;
	237	}
	238
	239	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
	240
	241	break;
	242	case SNDRV_PCM_TRIGGER_STOP:
	243	case SNDRV_PCM_TRIGGER_SUSPEND:
	244	val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET);
018334c0	245	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1082e270 WZ	246	tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0);
	247	tmp &= ~(SLOT3_VALID \| SLOT4_VALID);
	248	AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp);
	249
	250	AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR);
	251	val &= ~AC_PLAY;
	252	} else {
	253	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR);
	254	val &= ~AC_RECORD;
	255	}
	256
	257	AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val);
	258
	259	break;
	260	default:
	261	ret = -EINVAL;
	262	}
	263
	264	return ret;
	265	}
	266
	267	static int nuc900_ac97_probe(struct platform_device *pdev,
	268	struct snd_soc_dai *dai)
	269	{
	270	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	271	unsigned long val;
	272
	273	mutex_lock(&ac97_mutex);
	274
	275	/* enable unit clock */
	276	clk_enable(nuc900_audio->clk);
	277
	278	/* enable audio controller and AC-link interface */
	279	val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON);
	280	val \|= (IIS_AC_PIN_SEL \| ACLINK_EN);
	281	AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val);
	282
	283	mutex_unlock(&ac97_mutex);
	284
	285	return 0;
	286	}
	287
	288	static void nuc900_ac97_remove(struct platform_device *pdev,
	289	struct snd_soc_dai *dai)
	290	{
	291	struct nuc900_audio *nuc900_audio = nuc900_ac97_data;
	292
	293	clk_disable(nuc900_audio->clk);
	294	}
	295
	296	static struct snd_soc_dai_ops nuc900_ac97_dai_ops = {
	297	.trigger = nuc900_ac97_trigger,
	298	};
	299
f0fba2ad	300	static struct snd_soc_dai_driver nuc900_ac97_dai = {
1082e270 WZ	301	.probe = nuc900_ac97_probe,
	302	.remove = nuc900_ac97_remove,
	303	.ac97_control = 1,
	304	.playback = {
	305	.rates = SNDRV_PCM_RATE_8000_48000,
	306	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	307	.channels_min = 1,
	308	.channels_max = 2,
	309	},
	310	.capture = {
	311	.rates = SNDRV_PCM_RATE_8000_48000,
	312	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	313	.channels_min = 1,
	314	.channels_max = 2,
	315	},
	316	.ops = &nuc900_ac97_dai_ops,
	317	}
1082e270 WZ	318
	319	static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev)
	320	{
	321	struct nuc900_audio *nuc900_audio;
	322	int ret;
	323
	324	if (nuc900_ac97_data)
	325	return -EBUSY;
	326
	327	nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL);
	328	if (!nuc900_audio)
	329	return -ENOMEM;
	330
	331	spin_lock_init(&nuc900_audio->lock);
	332
	333	nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	334	if (!nuc900_audio->res) {
	335	ret = -ENODEV;
	336	goto out0;
	337	}
	338
	339	if (!request_mem_region(nuc900_audio->res->start,
	340	resource_size(nuc900_audio->res), pdev->name)) {
	341	ret = -EBUSY;
	342	goto out0;
	343	}
	344
	345	nuc900_audio->mmio = ioremap(nuc900_audio->res->start,
	346	resource_size(nuc900_audio->res));
	347	if (!nuc900_audio->mmio) {
	348	ret = -ENOMEM;
	349	goto out1;
	350	}
	351
	352	nuc900_audio->clk = clk_get(&pdev->dev, NULL);
	353	if (IS_ERR(nuc900_audio->clk)) {
	354	ret = PTR_ERR(nuc900_audio->clk);
	355	goto out2;
	356	}
	357
	358	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
	359	if (!nuc900_audio->irq_num) {
	360	ret = -EBUSY;
	361	goto out2;
	362	}
	363
	364	nuc900_ac97_data = nuc900_audio;
	365
f0fba2ad	366	ret = snd_soc_register_dai(&pdev->dev, &nuc900_ac97_dai);
1082e270 WZ	367	if (ret)
	368	goto out3;
	369
	370	mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/
	371
	372	return 0;
	373
	374	out3:
	375	clk_put(nuc900_audio->clk);
	376	out2:
	377	iounmap(nuc900_audio->mmio);
	378	out1:
	379	release_mem_region(nuc900_audio->res->start,
	380	resource_size(nuc900_audio->res));
	381	out0:
	382	kfree(nuc900_audio);
	383	return ret;
	384	}
	385
	386	static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev)
	387	{
	388
f0fba2ad	389	snd_soc_unregister_dai(&pdev->dev);
1082e270 WZ	390
	391	clk_put(nuc900_ac97_data->clk);
	392	iounmap(nuc900_ac97_data->mmio);
	393	release_mem_region(nuc900_ac97_data->res->start,
	394	resource_size(nuc900_ac97_data->res));
	395
	396	nuc900_ac97_data = NULL;
	397
	398	return 0;
	399	}
	400
	401	static struct platform_driver nuc900_ac97_driver = {
	402	.driver = {
f0fba2ad	403	.name = "nuc900-ac97",
1082e270 WZ	404	.owner = THIS_MODULE,
	405	},
	406	.probe = nuc900_ac97_drvprobe,
	407	.remove = __devexit_p(nuc900_ac97_drvremove),
	408	};
	409
	410	static int __init nuc900_ac97_init(void)
	411	{
	412	return platform_driver_register(&nuc900_ac97_driver);
	413	}
	414
	415	static void __exit nuc900_ac97_exit(void)
	416	{
	417	platform_driver_unregister(&nuc900_ac97_driver);
	418	}
	419
	420	module_init(nuc900_ac97_init);
	421	module_exit(nuc900_ac97_exit);
	422
	423	MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
	424	MODULE_DESCRIPTION("NUC900 AC97 SoC driver!");
	425	MODULE_LICENSE("GPL");
	426	MODULE_ALIAS("platform:nuc900-ac97");