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linux/sound/soc/au1x/psc-ac97.c
Mark Brown 3f4b783cfd ASoC: Register platform DAIs 
Register all platform DAIs with the core.  In line with current behaviour
this is done at module probe time rather than when the devices are probed
(since currently that only happens as the entire ASoC card is registered
except for those drivers that currently implement some kind of hotplug).
Since the core currently ignores DAI registration this has no practical
effect.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2008-12-09 10:49:27 +00:00

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/*
* Au12x0/Au1550 PSC ALSA ASoC audio support.
*
* (c) 2007-2008 MSC Vertriebsges.m.b.H.,
* Manuel Lauss <mano@roarinelk.homelinux.net>
*
* 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.
*
* NOTE: all of these drivers can only work with a SINGLE instance
* of a PSC. Multiple independent audio devices are impossible
* with ASoC v1.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.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"
#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)
/* instance data. There can be only one, MacLeod!!!! */
static struct au1xpsc_audio_data *au1xpsc_ac97_workdata;
/* AC97 controller reads codec register */
static unsigned short au1xpsc_ac97_read(struct snd_ac97 *ac97,
unsigned short reg)
{
/* FIXME */
struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
unsigned short data, tmo;
au_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg), AC97_CDC(pscdata));
au_sync();
tmo = 1000;
while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
udelay(2);
if (!tmo)
data = 0xffff;
else
data = au_readl(AC97_CDC(pscdata)) & 0xffff;
au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
au_sync();
return data;
}
/* AC97 controller writes to codec register */
static void au1xpsc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
unsigned short val)
{
/* FIXME */
struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
unsigned int tmo;
au_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff), AC97_CDC(pscdata));
au_sync();
tmo = 1000;
while ((!(au_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)) && --tmo)
au_sync();
au_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
au_sync();
}
/* AC97 controller asserts a warm reset */
static void au1xpsc_ac97_warm_reset(struct snd_ac97 *ac97)
{
/* FIXME */
struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
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)
{
/* FIXME */
struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
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 = 100000;
while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_SR)) && (--i))
au_sync();
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 = 100000;
while (!((au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)) && (--i))
au_sync();
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)
{
/* FIXME */
struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
unsigned long r, stat;
int chans, stype = SUBSTREAM_TYPE(substream);
chans = params_channels(params);
r = 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 {
/* disable AC97 device controller first */
au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
au_sync();
/* 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);
}
/* finally enable the AC97 controller again */
au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
au_sync();
pscdata->cfg = r;
pscdata->rate = params_rate(params);
}
return 0;
}
static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
/* FIXME */
struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
int ret, stype = SUBSTREAM_TYPE(substream);
ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
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();
break;
default:
ret = -EINVAL;
}
return ret;
}
static int au1xpsc_ac97_probe(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
int ret;
struct resource *r;
unsigned long sel;
if (au1xpsc_ac97_workdata)
return -EBUSY;
au1xpsc_ac97_workdata =
kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
if (!au1xpsc_ac97_workdata)
return -ENOMEM;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
ret = -ENODEV;
goto out0;
}
ret = -EBUSY;
au1xpsc_ac97_workdata->ioarea =
request_mem_region(r->start, r->end - r->start + 1,
"au1xpsc_ac97");
if (!au1xpsc_ac97_workdata->ioarea)
goto out0;
au1xpsc_ac97_workdata->mmio = ioremap(r->start, 0xffff);
if (!au1xpsc_ac97_workdata->mmio)
goto out1;
/* configuration: max dma trigger threshold, enable ac97 */
au1xpsc_ac97_workdata->cfg = PSC_AC97CFG_RT_FIFO8 |
PSC_AC97CFG_TT_FIFO8 |
PSC_AC97CFG_DE_ENABLE;
/* preserve PSC clock source set up by platform (dev.platform_data
* is already occupied by soc layer)
*/
sel = au_readl(PSC_SEL(au1xpsc_ac97_workdata)) & PSC_SEL_CLK_MASK;
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
au_sync();
au_writel(0, PSC_SEL(au1xpsc_ac97_workdata));
au_sync();
au_writel(PSC_SEL_PS_AC97MODE | sel, PSC_SEL(au1xpsc_ac97_workdata));
au_sync();
/* next up: cold reset. Dont check for PSC-ready now since
* there may not be any codec clock yet.
*/
return 0;
out1:
release_resource(au1xpsc_ac97_workdata->ioarea);
kfree(au1xpsc_ac97_workdata->ioarea);
out0:
kfree(au1xpsc_ac97_workdata);
au1xpsc_ac97_workdata = NULL;
return ret;
}
static void au1xpsc_ac97_remove(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
/* disable PSC completely */
au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
au_sync();
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
au_sync();
iounmap(au1xpsc_ac97_workdata->mmio);
release_resource(au1xpsc_ac97_workdata->ioarea);
kfree(au1xpsc_ac97_workdata->ioarea);
kfree(au1xpsc_ac97_workdata);
au1xpsc_ac97_workdata = NULL;
}
static int au1xpsc_ac97_suspend(struct snd_soc_dai *dai)
{
/* save interesting registers and disable PSC */
au1xpsc_ac97_workdata->pm[0] =
au_readl(PSC_SEL(au1xpsc_ac97_workdata));
au_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
au_sync();
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_ac97_workdata));
au_sync();
return 0;
}
static int au1xpsc_ac97_resume(struct snd_soc_dai *dai)
{
/* restore PSC clock config */
au_writel(au1xpsc_ac97_workdata->pm[0] | PSC_SEL_PS_AC97MODE,
PSC_SEL(au1xpsc_ac97_workdata));
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;
}
struct snd_soc_dai au1xpsc_ac97_dai = {
.name = "au1xpsc_ac97",
.ac97_control = 1,
.probe = au1xpsc_ac97_probe,
.remove = au1xpsc_ac97_remove,
.suspend = au1xpsc_ac97_suspend,
.resume = au1xpsc_ac97_resume,
.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 = {
.trigger = au1xpsc_ac97_trigger,
.hw_params = au1xpsc_ac97_hw_params,
},
};
EXPORT_SYMBOL_GPL(au1xpsc_ac97_dai);
static int __init au1xpsc_ac97_init(void)
{
au1xpsc_ac97_workdata = NULL;
return snd_soc_register_dai(&au1xpsc_ac97_dai);
}
static void __exit au1xpsc_ac97_exit(void)
{
snd_soc_unregister_dai(&au1xpsc_ac97_dai);
}
module_init(au1xpsc_ac97_init);
module_exit(au1xpsc_ac97_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC AC97 ALSA ASoC audio driver");
MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
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