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kernel-ark/sound/soc/au1x/psc-i2s.c
Mark Brown 3ba9e10a6d ASoC: Remove DAI type information 
DAI type information is only ever used within ASoC in order to special
case AC97 and for diagnostic purposes. Since modern CPUs and codecs
support multi function DAIs which can be configured for several modes
it is more trouble than it's worth to maintain anything other than a
flag identifying AC97 DAIs so remove the type field and replace it with
an ac97_control flag.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2008-11-24 18:01:31 +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 I2S 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.
* NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
*/
#include <linux/init.h>
#include <linux/module.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"
/* supported I2S DAI hardware formats */
#define AU1XPSC_I2S_DAIFMT \
(SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J | \
SND_SOC_DAIFMT_NB_NF)
/* supported I2S direction */
#define AU1XPSC_I2S_DIR \
(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
#define AU1XPSC_I2S_RATES \
SNDRV_PCM_RATE_8000_192000
#define AU1XPSC_I2S_FMTS \
(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
#define I2SSTAT_BUSY(stype) \
((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
#define I2SPCR_START(stype) \
((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
#define I2SPCR_STOP(stype) \
((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
#define I2SPCR_CLRFIFO(stype) \
((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
/* instance data. There can be only one, MacLeod!!!! */
static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;
static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
unsigned long ct;
int ret;
ret = -EINVAL;
ct = pscdata->cfg;
ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ); /* left-justified */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
ct |= PSC_I2SCFG_XM; /* enable I2S mode */
break;
case SND_SOC_DAIFMT_MSB:
break;
case SND_SOC_DAIFMT_LSB:
ct |= PSC_I2SCFG_MLJ; /* LSB (right-) justified */
break;
default:
goto out;
}
ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI); /* IB-IF */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
break;
case SND_SOC_DAIFMT_NB_IF:
ct |= PSC_I2SCFG_BI;
break;
case SND_SOC_DAIFMT_IB_NF:
ct |= PSC_I2SCFG_WI;
break;
case SND_SOC_DAIFMT_IB_IF:
break;
default:
goto out;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM: /* CODEC master */
ct |= PSC_I2SCFG_MS; /* PSC I2S slave mode */
break;
case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */
ct &= ~PSC_I2SCFG_MS; /* PSC I2S Master mode */
break;
default:
goto out;
}
pscdata->cfg = ct;
ret = 0;
out:
return ret;
}
static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
int cfgbits;
unsigned long stat;
/* check if the PSC is already streaming data */
stat = au_readl(I2S_STAT(pscdata));
if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
/* reject parameters not currently set up in hardware */
cfgbits = au_readl(I2S_CFG(pscdata));
if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
(params_rate(params) != pscdata->rate))
return -EINVAL;
} else {
/* set sample bitdepth */
pscdata->cfg &= ~(0x1f << 4);
pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
/* remember current rate for other stream */
pscdata->rate = params_rate(params);
}
return 0;
}
/* Configure PSC late: on my devel systems the codec is I2S master and
* supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC
* uses aggressive PM and switches the codec off when it is not in use
* which also means the PSC unit doesn't get any clocks and is therefore
* dead. That's why this chunk here gets called from the trigger callback
* because I can be reasonably certain the codec is driving the clocks.
*/
static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
{
unsigned long tmo;
/* bring PSC out of sleep, and configure I2S unit */
au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
au_sync();
tmo = 1000000;
while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
tmo--;
if (!tmo)
goto psc_err;
au_writel(0, I2S_CFG(pscdata));
au_sync();
au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
au_sync();
/* wait for I2S controller to become ready */
tmo = 1000000;
while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
tmo--;
if (tmo)
return 0;
psc_err:
au_writel(0, I2S_CFG(pscdata));
au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
au_sync();
return -ETIMEDOUT;
}
static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
{
unsigned long tmo, stat;
int ret;
ret = 0;
/* if both TX and RX are idle, configure the PSC */
stat = au_readl(I2S_STAT(pscdata));
if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
ret = au1xpsc_i2s_configure(pscdata);
if (ret)
goto out;
}
au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
au_sync();
au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
au_sync();
/* wait for start confirmation */
tmo = 1000000;
while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
tmo--;
if (!tmo) {
au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
au_sync();
ret = -ETIMEDOUT;
}
out:
return ret;
}
static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
{
unsigned long tmo, stat;
au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
au_sync();
/* wait for stop confirmation */
tmo = 1000000;
while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
tmo--;
/* if both TX and RX are idle, disable PSC */
stat = au_readl(I2S_STAT(pscdata));
if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
au_writel(0, I2S_CFG(pscdata));
au_sync();
au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
au_sync();
}
return 0;
}
static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
int ret, stype = SUBSTREAM_TYPE(substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
ret = au1xpsc_i2s_start(pscdata, stype);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
ret = au1xpsc_i2s_stop(pscdata, stype);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int au1xpsc_i2s_probe(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
struct resource *r;
unsigned long sel;
int ret;
if (au1xpsc_i2s_workdata)
return -EBUSY;
au1xpsc_i2s_workdata =
kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
if (!au1xpsc_i2s_workdata)
return -ENOMEM;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
ret = -ENODEV;
goto out0;
}
ret = -EBUSY;
au1xpsc_i2s_workdata->ioarea =
request_mem_region(r->start, r->end - r->start + 1,
"au1xpsc_i2s");
if (!au1xpsc_i2s_workdata->ioarea)
goto out0;
au1xpsc_i2s_workdata->mmio = ioremap(r->start, 0xffff);
if (!au1xpsc_i2s_workdata->mmio)
goto out1;
/* preserve PSC clock source set up by platform (dev.platform_data
* is already occupied by soc layer)
*/
sel = au_readl(PSC_SEL(au1xpsc_i2s_workdata)) & PSC_SEL_CLK_MASK;
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
au_sync();
au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(au1xpsc_i2s_workdata));
au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
au_sync();
/* preconfigure: set max rx/tx fifo depths */
au1xpsc_i2s_workdata->cfg |=
PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;
/* don't wait for I2S core to become ready now; clocks may not
* be running yet; depending on clock input for PSC a wait might
* time out.
*/
return 0;
out1:
release_resource(au1xpsc_i2s_workdata->ioarea);
kfree(au1xpsc_i2s_workdata->ioarea);
out0:
kfree(au1xpsc_i2s_workdata);
au1xpsc_i2s_workdata = NULL;
return ret;
}
static void au1xpsc_i2s_remove(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
au_sync();
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
au_sync();
iounmap(au1xpsc_i2s_workdata->mmio);
release_resource(au1xpsc_i2s_workdata->ioarea);
kfree(au1xpsc_i2s_workdata->ioarea);
kfree(au1xpsc_i2s_workdata);
au1xpsc_i2s_workdata = NULL;
}
static int au1xpsc_i2s_suspend(struct platform_device *pdev,
struct snd_soc_dai *cpu_dai)
{
/* save interesting register and disable PSC */
au1xpsc_i2s_workdata->pm[0] =
au_readl(PSC_SEL(au1xpsc_i2s_workdata));
au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
au_sync();
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
au_sync();
return 0;
}
static int au1xpsc_i2s_resume(struct platform_device *pdev,
struct snd_soc_dai *cpu_dai)
{
/* select I2S mode and PSC clock */
au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
au_sync();
au_writel(0, PSC_SEL(au1xpsc_i2s_workdata));
au_sync();
au_writel(au1xpsc_i2s_workdata->pm[0],
PSC_SEL(au1xpsc_i2s_workdata));
au_sync();
return 0;
}
struct snd_soc_dai au1xpsc_i2s_dai = {
.name = "au1xpsc_i2s",
.probe = au1xpsc_i2s_probe,
.remove = au1xpsc_i2s_remove,
.suspend = au1xpsc_i2s_suspend,
.resume = au1xpsc_i2s_resume,
.playback = {
.rates = AU1XPSC_I2S_RATES,
.formats = AU1XPSC_I2S_FMTS,
.channels_min = 2,
.channels_max = 8, /* 2 without external help */
},
.capture = {
.rates = AU1XPSC_I2S_RATES,
.formats = AU1XPSC_I2S_FMTS,
.channels_min = 2,
.channels_max = 8, /* 2 without external help */
},
.ops = {
.trigger = au1xpsc_i2s_trigger,
.hw_params = au1xpsc_i2s_hw_params,
.set_fmt = au1xpsc_i2s_set_fmt,
},
};
EXPORT_SYMBOL(au1xpsc_i2s_dai);
static int __init au1xpsc_i2s_init(void)
{
au1xpsc_i2s_workdata = NULL;
return 0;
}
static void __exit au1xpsc_i2s_exit(void)
{
}
module_init(au1xpsc_i2s_init);
module_exit(au1xpsc_i2s_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
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