422 lines
11 KiB
C
422 lines
11 KiB
C
|
/*
|
||
|
|
* Au12x0/Au1550 PSC ALSA ASoC audio support.
|
||
|
|
*
|
||
|
|
* (c) 2007-2008 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 I2S glue.
|
||
|
|
*
|
||
|
|
* NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/slab.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) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
|
||
|
|
#define I2SPCR_START(stype) \
|
||
|
|
((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
|
||
|
|
#define I2SPCR_STOP(stype) \
|
||
|
|
((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
|
||
|
|
#define I2SPCR_CLRFIFO(stype) \
|
||
|
|
((stype) == SNDRV_PCM_STREAM_PLAYBACK ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
|
||
|
|
|
||
|
|
|
||
|
|
static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
|
||
|
|
unsigned int fmt)
|
||
|
|
{
|
||
|
|
struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(cpu_dai);
|
||
|
|
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 = snd_soc_dai_get_drvdata(dai);
|
||
|
|
|
||
|
|
int cfgbits;
|
||
|
|
unsigned long stat;
|
||
|
|
|
||
|
|
/* check if the PSC is already streaming data */
|
||
|
|
stat = __raw_readl(I2S_STAT(pscdata));
|
||
|
|
if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
|
||
|
|
/* reject parameters not currently set up in hardware */
|
||
|
|
cfgbits = __raw_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 */
|
||
|
|
__raw_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
tmo = 1000000;
|
||
|
|
while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
|
||
|
|
tmo--;
|
||
|
|
|
||
|
|
if (!tmo)
|
||
|
|
goto psc_err;
|
||
|
|
|
||
|
|
__raw_writel(0, I2S_CFG(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
/* wait for I2S controller to become ready */
|
||
|
|
tmo = 1000000;
|
||
|
|
while (!(__raw_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
|
||
|
|
tmo--;
|
||
|
|
|
||
|
|
if (tmo)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
psc_err:
|
||
|
|
__raw_writel(0, I2S_CFG(pscdata));
|
||
|
|
__raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
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 = __raw_readl(I2S_STAT(pscdata));
|
||
|
|
if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
|
||
|
|
ret = au1xpsc_i2s_configure(pscdata);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
__raw_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
/* wait for start confirmation */
|
||
|
|
tmo = 1000000;
|
||
|
|
while (!(__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
|
||
|
|
tmo--;
|
||
|
|
|
||
|
|
if (!tmo) {
|
||
|
|
__raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
ret = -ETIMEDOUT;
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
|
||
|
|
{
|
||
|
|
unsigned long tmo, stat;
|
||
|
|
|
||
|
|
__raw_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
/* wait for stop confirmation */
|
||
|
|
tmo = 1000000;
|
||
|
|
while ((__raw_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
|
||
|
|
tmo--;
|
||
|
|
|
||
|
|
/* if both TX and RX are idle, disable PSC */
|
||
|
|
stat = __raw_readl(I2S_STAT(pscdata));
|
||
|
|
if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
|
||
|
|
__raw_writel(0, I2S_CFG(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int au1xpsc_i2s_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->stream;
|
||
|
|
|
||
|
|
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_startup(struct snd_pcm_substream *substream,
|
||
|
|
struct snd_soc_dai *dai)
|
||
|
|
{
|
||
|
|
struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
|
||
|
|
snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
|
||
|
|
.startup = au1xpsc_i2s_startup,
|
||
|
|
.trigger = au1xpsc_i2s_trigger,
|
||
|
|
.hw_params = au1xpsc_i2s_hw_params,
|
||
|
|
.set_fmt = au1xpsc_i2s_set_fmt,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct snd_soc_dai_driver au1xpsc_i2s_dai_template = {
|
||
|
|
.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 = &au1xpsc_i2s_dai_ops,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct snd_soc_component_driver au1xpsc_i2s_component = {
|
||
|
|
.name = "au1xpsc-i2s",
|
||
|
|
};
|
||
|
|
|
||
|
|
static int au1xpsc_i2s_drvprobe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct resource *iores, *dmares;
|
||
|
|
unsigned long sel;
|
||
|
|
struct au1xpsc_audio_data *wd;
|
||
|
|
|
||
|
|
wd = devm_kzalloc(&pdev->dev, sizeof(struct au1xpsc_audio_data),
|
||
|
|
GFP_KERNEL);
|
||
|
|
if (!wd)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
|
wd->mmio = devm_ioremap_resource(&pdev->dev, iores);
|
||
|
|
if (IS_ERR(wd->mmio))
|
||
|
|
return PTR_ERR(wd->mmio);
|
||
|
|
|
||
|
|
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
||
|
|
if (!dmares)
|
||
|
|
return -EBUSY;
|
||
|
|
wd->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
|
||
|
|
|
||
|
|
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
||
|
|
if (!dmares)
|
||
|
|
return -EBUSY;
|
||
|
|
wd->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
|
||
|
|
|
||
|
|
/* preserve PSC clock source set up by platform (dev.platform_data
|
||
|
|
* is already occupied by soc layer)
|
||
|
|
*/
|
||
|
|
sel = __raw_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
|
||
|
|
__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
|
||
|
|
__raw_writel(0, I2S_CFG(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
/* preconfigure: set max rx/tx fifo depths */
|
||
|
|
wd->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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* name the DAI like this device instance ("au1xpsc-i2s.PSCINDEX") */
|
||
|
|
memcpy(&wd->dai_drv, &au1xpsc_i2s_dai_template,
|
||
|
|
sizeof(struct snd_soc_dai_driver));
|
||
|
|
wd->dai_drv.name = dev_name(&pdev->dev);
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, wd);
|
||
|
|
|
||
|
|
return snd_soc_register_component(&pdev->dev, &au1xpsc_i2s_component,
|
||
|
|
&wd->dai_drv, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int au1xpsc_i2s_drvremove(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
|
||
|
|
|
||
|
|
snd_soc_unregister_component(&pdev->dev);
|
||
|
|
|
||
|
|
__raw_writel(0, I2S_CFG(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_PM
|
||
|
|
static int au1xpsc_i2s_drvsuspend(struct device *dev)
|
||
|
|
{
|
||
|
|
struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
/* save interesting register and disable PSC */
|
||
|
|
wd->pm[0] = __raw_readl(PSC_SEL(wd));
|
||
|
|
|
||
|
|
__raw_writel(0, I2S_CFG(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int au1xpsc_i2s_drvresume(struct device *dev)
|
||
|
|
{
|
||
|
|
struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
/* select I2S mode and PSC clock */
|
||
|
|
__raw_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(0, PSC_SEL(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
__raw_writel(wd->pm[0], PSC_SEL(wd));
|
||
|
|
wmb(); /* drain writebuffer */
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct dev_pm_ops au1xpsci2s_pmops = {
|
||
|
|
.suspend = au1xpsc_i2s_drvsuspend,
|
||
|
|
.resume = au1xpsc_i2s_drvresume,
|
||
|
|
};
|
||
|
|
|
||
|
|
#define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
|
||
|
|
|
||
|
|
#else
|
||
|
|
|
||
|
|
#define AU1XPSCI2S_PMOPS NULL
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static struct platform_driver au1xpsc_i2s_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "au1xpsc_i2s",
|
||
|
|
.pm = AU1XPSCI2S_PMOPS,
|
||
|
|
},
|
||
|
|
.probe = au1xpsc_i2s_drvprobe,
|
||
|
|
.remove = au1xpsc_i2s_drvremove,
|
||
|
|
};
|
||
|
|
|
||
|
|
module_platform_driver(au1xpsc_i2s_driver);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
|
||
|
|
MODULE_AUTHOR("Manuel Lauss");
|