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08a0b71757
linux/sound/soc/nuc900/nuc900-ac97.c
Wan ZongShun 08a0b71757 ASoC: nuc900: patch for modifing the ac97 delays to minimum 
This patch is to modify the ac97 delays to minimum, all these 1000 micro
seconds delays seem over spec for the AC97 interface.

I deleted some unnecessary delays here and changed the AC97 cold and warm reset
delays from 1000us to 100us.

Signed-off-by: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2010-06-02 11:47:06 +01:00

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/*
* 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,
};
struct snd_soc_dai nuc900_ac97_dai = {
.name = "nuc900-ac97",
.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,
}
EXPORT_SYMBOL_GPL(nuc900_ac97_dai);
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;
nuc900_audio->dev = nuc900_ac97_dai.dev = &pdev->dev;
ret = snd_soc_register_dai(&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(&nuc900_ac97_dai);
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-audio",
.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");
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