517 строки
12 KiB
C
517 строки
12 KiB
C
/*
|
|
* Au12x0/Au1550 PSC ALSA ASoC audio support.
|
|
*
|
|
* (c) 2007-2009 MSC Vertriebsges.m.b.H.,
|
|
* Manuel Lauss <manuel.lauss@gmail.com>
|
|
*
|
|
* 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.
|
|
*
|
|
* Au1xxx-PSC AC97 glue.
|
|
*
|
|
*/
|
|
|
|
#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 <asm/mach-au1x00/au1000.h>
|
|
#include <asm/mach-au1x00/au1xxx_psc.h>
|
|
|
|
#include "psc.h"
|
|
|
|
/* how often to retry failed codec register reads/writes */
|
|
#define AC97_RW_RETRIES 5
|
|
|
|
#define AC97_DIR \
|
|
(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
|
|
|
|
#define AC97_RATES \
|
|
SNDRV_PCM_RATE_8000_48000
|
|
|
|
#define AC97_FMTS \
|
|
(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3BE)
|
|
|
|
#define AC97PCR_START(stype) \
|
|
((stype) == PCM_TX ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
|
|
#define AC97PCR_STOP(stype) \
|
|
((stype) == PCM_TX ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
|
|
#define AC97PCR_CLRFIFO(stype) \
|
|
((stype) == PCM_TX ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
|
|
|
|
#define AC97STAT_BUSY(stype) \
|
|
((stype) == PCM_TX ? PSC_AC97STAT_TB : PSC_AC97STAT_RB)
|
|
|
|
/* instance data. There can be only one, MacLeod!!!! */
|
|
static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
|
|
|
|
#if 0
|
|
|
|
/* this could theoretically work, but ac97->bus->card->private_data can be NULL
|
|
* when snd_ac97_mixer() is called; I don't know if the rest further down the
|
|
* chain are always valid either.
|
|
*/
|
|
static inline struct au1xpsc_audio_data *ac97_to_pscdata(struct snd_ac97 *x)
|
|
{
|
|
struct snd_soc_card *c = x->bus->card->private_data;
|
|
return snd_soc_dai_get_drvdata(c->rtd->cpu_dai);
|
|
}
|
|
|
|
#else
|
|
|
|
#define ac97_to_pscdata(x) au1xpsc_ac97_workdata
|
|
|
|
#endif
|
|
|
|
/* AC97 controller reads codec register */
|
|
static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
|
|
unsigned short reg)
|
|
{
|
|
struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
|
|
unsigned short retry, tmo;
|
|
unsigned long data;
|
|
|
|
au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
|
|
au_sync();
|
|
|
|
retry = AC97_RW_RETRIES;
|
|
do {
|
|
mutex_lock(&pscdata->lock);
|
|
|
|
au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
|
|
AC97_CDC(pscdata));
|
|
au_sync();
|
|
|
|
tmo = 20;
|
|
do {
|
|
udelay(21);
|
|
if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
|
|
break;
|
|
} while (--tmo);
|
|
|
|
data = au_readl(AC97_CDC(pscdata));
|
|
|
|
au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
|
|
au_sync();
|
|
|
|
mutex_unlock(&pscdata->lock);
|
|
|
|
if (reg != ((data >> 16) & 0x7f))
|
|
tmo = 1; /* wrong register, try again */
|
|
|
|
} while (--retry && !tmo);
|
|
|
|
return retry ? data & 0xffff : 0xffff;
|
|
}
|
|
|
|
/* AC97 controller writes to codec register */
|
|
static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
|
|
unsigned short val)
|
|
{
|
|
struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
|
|
unsigned int tmo, retry;
|
|
|
|
au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
|
|
au_sync();
|
|
|
|
retry = AC97_RW_RETRIES;
|
|
do {
|
|
mutex_lock(&pscdata->lock);
|
|
|
|
au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
|
|
AC97_CDC(pscdata));
|
|
au_sync();
|
|
|
|
tmo = 20;
|
|
do {
|
|
udelay(21);
|
|
if (au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
|
|
break;
|
|
} while (--tmo);
|
|
|
|
au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
|
|
au_sync();
|
|
|
|
mutex_unlock(&pscdata->lock);
|
|
} while (--retry && !tmo);
|
|
}
|
|
|
|
/* AC97 controller asserts a warm reset */
|
|
static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
|
|
{
|
|
struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
|
|
|
|
au_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
|
|
au_sync();
|
|
msleep(10);
|
|
au_writel(0, AC97_RST(pscdata));
|
|
au_sync();
|
|
}
|
|
|
|
static void au1xpsc_ac97_cold_reset(struct snd_ac97 *ac97)
|
|
{
|
|
struct au1xpsc_audio_data *pscdata = ac97_to_pscdata(ac97);
|
|
int i;
|
|
|
|
/* disable PSC during cold reset */
|
|
au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
|
|
au_sync();
|
|
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
|
|
au_sync();
|
|
|
|
/* issue cold reset */
|
|
au_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
|
|
au_sync();
|
|
msleep(500);
|
|
au_writel(0, AC97_RST(pscdata));
|
|
au_sync();
|
|
|
|
/* enable PSC */
|
|
au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
|
|
au_sync();
|
|
|
|
/* wait for PSC to indicate it's ready */
|
|
i = 1000;
|
|
while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
|
|
msleep(1);
|
|
|
|
if (i == 0) {
|
|
printk(KERN_ERR "au1xpsc-ac97: PSC not ready!\n");
|
|
return;
|
|
}
|
|
|
|
/* enable the ac97 function */
|
|
au_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
|
|
au_sync();
|
|
|
|
/* wait for AC97 core to become ready */
|
|
i = 1000;
|
|
while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
|
|
msleep(1);
|
|
if (i == 0)
|
|
printk(KERN_ERR "au1xpsc-ac97: AC97 ctrl not ready\n");
|
|
}
|
|
|
|
/* AC97 controller operations */
|
|
struct snd_ac97_bus_ops soc_ac97_ops = {
|
|
.read = au1xpsc_ac97_read,
|
|
.write = au1xpsc_ac97_write,
|
|
.reset = au1xpsc_ac97_cold_reset,
|
|
.warm_reset = au1xpsc_ac97_warm_reset,
|
|
};
|
|
EXPORT_SYMBOL_GPL(soc_ac97_ops);
|
|
|
|
static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
|
|
unsigned long r, ro, stat;
|
|
int chans, t, stype = SUBSTREAM_TYPE(substream);
|
|
|
|
chans = params_channels(params);
|
|
|
|
r = ro = au_readl(AC97_CFG(pscdata));
|
|
stat = au_readl(AC97_STAT(pscdata));
|
|
|
|
/* already active? */
|
|
if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
|
|
/* reject parameters not currently set up */
|
|
if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
|
|
(pscdata->rate != params_rate(params)))
|
|
return -EINVAL;
|
|
} else {
|
|
|
|
/* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
|
|
r &= ~PSC_AC97CFG_LEN_MASK;
|
|
r |= PSC_AC97CFG_SET_LEN(params->msbits);
|
|
|
|
/* channels: enable slots for front L/R channel */
|
|
if (stype == PCM_TX) {
|
|
r &= ~PSC_AC97CFG_TXSLOT_MASK;
|
|
r |= PSC_AC97CFG_TXSLOT_ENA(3);
|
|
r |= PSC_AC97CFG_TXSLOT_ENA(4);
|
|
} else {
|
|
r &= ~PSC_AC97CFG_RXSLOT_MASK;
|
|
r |= PSC_AC97CFG_RXSLOT_ENA(3);
|
|
r |= PSC_AC97CFG_RXSLOT_ENA(4);
|
|
}
|
|
|
|
/* do we need to poke the hardware? */
|
|
if (!(r ^ ro))
|
|
goto out;
|
|
|
|
/* ac97 engine is about to be disabled */
|
|
mutex_lock(&pscdata->lock);
|
|
|
|
/* disable AC97 device controller first... */
|
|
au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
|
|
au_sync();
|
|
|
|
/* ...wait for it... */
|
|
t = 100;
|
|
while ((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
|
|
msleep(1);
|
|
|
|
if (!t)
|
|
printk(KERN_ERR "PSC-AC97: can't disable!\n");
|
|
|
|
/* ...write config... */
|
|
au_writel(r, AC97_CFG(pscdata));
|
|
au_sync();
|
|
|
|
/* ...enable the AC97 controller again... */
|
|
au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
|
|
au_sync();
|
|
|
|
/* ...and wait for ready bit */
|
|
t = 100;
|
|
while ((!(au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && --t)
|
|
msleep(1);
|
|
|
|
if (!t)
|
|
printk(KERN_ERR "PSC-AC97: can't enable!\n");
|
|
|
|
mutex_unlock(&pscdata->lock);
|
|
|
|
pscdata->cfg = r;
|
|
pscdata->rate = params_rate(params);
|
|
}
|
|
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
|
|
int cmd, struct snd_soc_dai *dai)
|
|
{
|
|
struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
|
|
int ret, stype = SUBSTREAM_TYPE(substream);
|
|
|
|
ret = 0;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
|
|
au_sync();
|
|
au_writel(AC97PCR_START(stype), AC97_PCR(pscdata));
|
|
au_sync();
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
au_writel(AC97PCR_STOP(stype), AC97_PCR(pscdata));
|
|
au_sync();
|
|
|
|
while (au_readl(AC97_STAT(pscdata)) & AC97STAT_BUSY(stype))
|
|
asm volatile ("nop");
|
|
|
|
au_writel(AC97PCR_CLRFIFO(stype), AC97_PCR(pscdata));
|
|
au_sync();
|
|
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
|
|
{
|
|
return au1xpsc_ac97_workdata ? 0 : -ENODEV;
|
|
}
|
|
|
|
static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
|
|
.trigger = au1xpsc_ac97_trigger,
|
|
.hw_params = au1xpsc_ac97_hw_params,
|
|
};
|
|
|
|
static const struct snd_soc_dai_driver au1xpsc_ac97_dai_template = {
|
|
.ac97_control = 1,
|
|
.probe = au1xpsc_ac97_probe,
|
|
.playback = {
|
|
.rates = AC97_RATES,
|
|
.formats = AC97_FMTS,
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
},
|
|
.capture = {
|
|
.rates = AC97_RATES,
|
|
.formats = AC97_FMTS,
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
},
|
|
.ops = &au1xpsc_ac97_dai_ops,
|
|
};
|
|
|
|
static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct resource *r;
|
|
unsigned long sel;
|
|
struct au1xpsc_audio_data *wd;
|
|
|
|
wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
|
|
if (!wd)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&wd->lock);
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!r) {
|
|
ret = -ENODEV;
|
|
goto out0;
|
|
}
|
|
|
|
ret = -EBUSY;
|
|
if (!request_mem_region(r->start, resource_size(r), pdev->name))
|
|
goto out0;
|
|
|
|
wd->mmio = ioremap(r->start, resource_size(r));
|
|
if (!wd->mmio)
|
|
goto out1;
|
|
|
|
/* configuration: max dma trigger threshold, enable ac97 */
|
|
wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
|
|
PSC_AC97CFG_DE_ENABLE;
|
|
|
|
/* preserve PSC clock source set up by platform */
|
|
sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
|
|
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
|
au_sync();
|
|
au_writel(0, PSC_SEL(wd));
|
|
au_sync();
|
|
au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(wd));
|
|
au_sync();
|
|
|
|
/* name the DAI like this device instance ("au1xpsc-ac97.PSCINDEX") */
|
|
memcpy(&wd->dai_drv, &au1xpsc_ac97_dai_template,
|
|
sizeof(struct snd_soc_dai_driver));
|
|
wd->dai_drv.name = dev_name(&pdev->dev);
|
|
|
|
platform_set_drvdata(pdev, wd);
|
|
|
|
ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
|
|
if (ret)
|
|
goto out1;
|
|
|
|
wd->dmapd = au1xpsc_pcm_add(pdev);
|
|
if (wd->dmapd) {
|
|
au1xpsc_ac97_workdata = wd;
|
|
return 0;
|
|
}
|
|
|
|
snd_soc_unregister_dai(&pdev->dev);
|
|
out1:
|
|
release_mem_region(r->start, resource_size(r));
|
|
out0:
|
|
kfree(wd);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit au1xpsc_ac97_drvremove(struct platform_device *pdev)
|
|
{
|
|
struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
|
|
struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
if (wd->dmapd)
|
|
au1xpsc_pcm_destroy(wd->dmapd);
|
|
|
|
snd_soc_unregister_dai(&pdev->dev);
|
|
|
|
/* disable PSC completely */
|
|
au_writel(0, AC97_CFG(wd));
|
|
au_sync();
|
|
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
|
au_sync();
|
|
|
|
iounmap(wd->mmio);
|
|
release_mem_region(r->start, resource_size(r));
|
|
kfree(wd);
|
|
|
|
au1xpsc_ac97_workdata = NULL; /* MDEV */
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int au1xpsc_ac97_drvsuspend(struct device *dev)
|
|
{
|
|
struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
|
|
|
|
/* save interesting registers and disable PSC */
|
|
wd->pm[0] = au_readl(PSC_SEL(wd));
|
|
|
|
au_writel(0, AC97_CFG(wd));
|
|
au_sync();
|
|
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
|
au_sync();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int au1xpsc_ac97_drvresume(struct device *dev)
|
|
{
|
|
struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
|
|
|
|
/* restore PSC clock config */
|
|
au_writel(wd->pm[0] | PSC_SEL_PS_AC97MODE, PSC_SEL(wd));
|
|
au_sync();
|
|
|
|
/* after this point the ac97 core will cold-reset the codec.
|
|
* During cold-reset the PSC is reinitialized and the last
|
|
* configuration set up in hw_params() is restored.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
static struct dev_pm_ops au1xpscac97_pmops = {
|
|
.suspend = au1xpsc_ac97_drvsuspend,
|
|
.resume = au1xpsc_ac97_drvresume,
|
|
};
|
|
|
|
#define AU1XPSCAC97_PMOPS &au1xpscac97_pmops
|
|
|
|
#else
|
|
|
|
#define AU1XPSCAC97_PMOPS NULL
|
|
|
|
#endif
|
|
|
|
static struct platform_driver au1xpsc_ac97_driver = {
|
|
.driver = {
|
|
.name = "au1xpsc_ac97",
|
|
.owner = THIS_MODULE,
|
|
.pm = AU1XPSCAC97_PMOPS,
|
|
},
|
|
.probe = au1xpsc_ac97_drvprobe,
|
|
.remove = __devexit_p(au1xpsc_ac97_drvremove),
|
|
};
|
|
|
|
static int __init au1xpsc_ac97_load(void)
|
|
{
|
|
au1xpsc_ac97_workdata = NULL;
|
|
return platform_driver_register(&au1xpsc_ac97_driver);
|
|
}
|
|
|
|
static void __exit au1xpsc_ac97_unload(void)
|
|
{
|
|
platform_driver_unregister(&au1xpsc_ac97_driver);
|
|
}
|
|
|
|
module_init(au1xpsc_ac97_load);
|
|
module_exit(au1xpsc_ac97_unload);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
|
|
MODULE_AUTHOR("Manuel Lauss");
|
|
|