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|
/*
* 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) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TS : PSC_AC97PCR_RS)
#define AC97PCR_STOP(stype) \
((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TP : PSC_AC97PCR_RP)
#define AC97PCR_CLRFIFO(stype) \
((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_AC97PCR_TC : PSC_AC97PCR_RC)
#define AC97STAT_BUSY(stype) \
((stype) == SNDRV_PCM_STREAM_PLAYBACK ? 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;
__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
wmb(); /* drain writebuffer */
retry = AC97_RW_RETRIES;
do {
mutex_lock(&pscdata->lock);
__raw_writel(PSC_AC97CDC_RD | PSC_AC97CDC_INDX(reg),
AC97_CDC(pscdata));
wmb(); /* drain writebuffer */
tmo = 20;
do {
udelay(21);
if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
break;
} while (--tmo);
data = __raw_readl(AC97_CDC(pscdata));
__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
wmb(); /* drain writebuffer */
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;
__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
wmb(); /* drain writebuffer */
retry = AC97_RW_RETRIES;
do {
mutex_lock(&pscdata->lock);
__raw_writel(PSC_AC97CDC_INDX(reg) | (val & 0xffff),
AC97_CDC(pscdata));
wmb(); /* drain writebuffer */
tmo = 20;
do {
udelay(21);
if (__raw_readl(AC97_EVNT(pscdata)) & PSC_AC97EVNT_CD)
break;
} while (--tmo);
__raw_writel(PSC_AC97EVNT_CD, AC97_EVNT(pscdata));
wmb(); /* drain writebuffer */
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);
__raw_writel(PSC_AC97RST_SNC, AC97_RST(pscdata));
wmb(); /* drain writebuffer */
msleep(10);
__raw_writel(0, AC97_RST(pscdata));
wmb(); /* drain writebuffer */
}
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 */
__raw_writel(0, AC97_CFG(au1xpsc_ac97_workdata));
wmb(); /* drain writebuffer */
__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(pscdata));
wmb(); /* drain writebuffer */
/* issue cold reset */
__raw_writel(PSC_AC97RST_RST, AC97_RST(pscdata));
wmb(); /* drain writebuffer */
msleep(500);
__raw_writel(0, AC97_RST(pscdata));
wmb(); /* drain writebuffer */
/* enable PSC */
__raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
wmb(); /* drain writebuffer */
/* wait for PSC to indicate it's ready */
i = 1000;
while (!((__raw_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 */
__raw_writel(pscdata->cfg | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
wmb(); /* drain writebuffer */
/* wait for AC97 core to become ready */
i = 1000;
while (!((__raw_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 */
static struct snd_ac97_bus_ops psc_ac97_ops = {
.read = au1xpsc_ac97_read,
.write = au1xpsc_ac97_write,
.reset = au1xpsc_ac97_cold_reset,
.warm_reset = au1xpsc_ac97_warm_reset,
};
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->stream;
chans = params_channels(params);
r = ro = __raw_readl(AC97_CFG(pscdata));
stat = __raw_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 == SNDRV_PCM_STREAM_PLAYBACK) {
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... */
__raw_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
wmb(); /* drain writebuffer */
/* ...wait for it... */
t = 100;
while ((__raw_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR) && --t)
msleep(1);
if (!t)
printk(KERN_ERR "PSC-AC97: can't disable!\n");
/* ...write config... */
__raw_writel(r, AC97_CFG(pscdata));
wmb(); /* drain writebuffer */
/* ...enable the AC97 controller again... */
__raw_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
wmb(); /* drain writebuffer */
/* ...and wait for ready bit */
t = 100;
while ((!(__raw_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->
|