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linux/sound/soc/kirkwood/kirkwood-i2s.c
apatard@mandriva.com f9b95980f8 ASoC: kirkwood: Add i2s support 
This patch enables support for the i2s controller available on kirkwood
platforms

Signed-off-by: Arnaud Patard <apatard@mandriva.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2010-05-31 13:16:37 +01:00

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/*
* kirkwood-i2s.c
*
* (c) 2010 Arnaud Patard <apatard@mandriva.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mbus.h>
#include <linux/delay.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <plat/audio.h>
#include "kirkwood-i2s.h"
#include "kirkwood.h"
#define DRV_NAME "kirkwood-i2s"
#define KIRKWOOD_I2S_RATES \
(SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
#define KIRKWOOD_I2S_FORMATS \
(SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_S32_LE)
struct snd_soc_dai kirkwood_i2s_dai;
static struct kirkwood_dma_data *priv;
static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
unsigned long mask;
unsigned long value;
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
mask = KIRKWOOD_I2S_CTL_RJ;
break;
case SND_SOC_DAIFMT_LEFT_J:
mask = KIRKWOOD_I2S_CTL_LJ;
break;
case SND_SOC_DAIFMT_I2S:
mask = KIRKWOOD_I2S_CTL_I2S;
break;
default:
return -EINVAL;
}
/*
* Set same format for playback and record
* This avoids some troubles.
*/
value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
value |= mask;
writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
value |= mask;
writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
return 0;
}
static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
{
unsigned long value;
value = KIRKWOOD_DCO_CTL_OFFSET_0;
switch (rate) {
default:
case 44100:
value |= KIRKWOOD_DCO_CTL_FREQ_11;
break;
case 48000:
value |= KIRKWOOD_DCO_CTL_FREQ_12;
break;
case 96000:
value |= KIRKWOOD_DCO_CTL_FREQ_24;
break;
}
writel(value, io + KIRKWOOD_DCO_CTL);
/* wait for dco locked */
do {
cpu_relax();
value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
value &= KIRKWOOD_DCO_SPCR_STATUS;
} while (value == 0);
}
static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
unsigned int i2s_reg, reg;
unsigned long i2s_value, value;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_reg = KIRKWOOD_I2S_PLAYCTL;
reg = KIRKWOOD_PLAYCTL;
} else {
i2s_reg = KIRKWOOD_I2S_RECCTL;
reg = KIRKWOOD_RECCTL;
}
/* set dco conf */
kirkwood_set_dco(priv->io, params_rate(params));
i2s_value = readl(priv->io+i2s_reg);
i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
value = readl(priv->io+reg);
value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;
/*
* Size settings in play/rec i2s control regs and play/rec control
* regs must be the same.
*/
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
break;
/*
* doesn't work... S20_3LE != kirkwood 20bit format ?
*
case SNDRV_PCM_FORMAT_S20_3LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
value |= KIRKWOOD_PLAYCTL_SIZE_20;
break;
*/
case SNDRV_PCM_FORMAT_S24_LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
value |= KIRKWOOD_PLAYCTL_SIZE_24;
break;
case SNDRV_PCM_FORMAT_S32_LE:
i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
value |= KIRKWOOD_PLAYCTL_SIZE_32;
break;
default:
return -EINVAL;
}
writel(i2s_value, priv->io+i2s_reg);
writel(value, priv->io+reg);
return 0;
}
static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
unsigned long value;
/*
* specs says KIRKWOOD_PLAYCTL must be read 2 times before
* changing it. So read 1 time here and 1 later.
*/
value = readl(priv->io + KIRKWOOD_PLAYCTL);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
/* stop audio, enable interrupts */
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value |= KIRKWOOD_PLAYCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_PLAYCTL);
value = readl(priv->io + KIRKWOOD_INT_MASK);
value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
writel(value, priv->io + KIRKWOOD_INT_MASK);
/* configure audio & enable i2s playback */
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
value &= ~(KIRKWOOD_PLAYCTL_PAUSE|KIRKWOOD_PLAYCTL_SPDIF_EN);
if (priv->burst == 32)
value |= KIRKWOOD_PLAYCTL_BURST_32;
else
value |= KIRKWOOD_PLAYCTL_BURST_128;
value |= KIRKWOOD_PLAYCTL_I2S_EN;
writel(value, priv->io + KIRKWOOD_PLAYCTL);
break;
case SNDRV_PCM_TRIGGER_STOP:
/* stop audio, disable interrupts */
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value |= KIRKWOOD_PLAYCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_PLAYCTL);
value = readl(priv->io + KIRKWOOD_INT_MASK);
value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
writel(value, priv->io + KIRKWOOD_INT_MASK);
/* disable all playbacks */
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
writel(value, priv->io + KIRKWOOD_PLAYCTL);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value |= KIRKWOOD_PLAYCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_PLAYCTL);
break;
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value &= ~KIRKWOOD_PLAYCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_PLAYCTL);
break;
default:
return -EINVAL;
}
return 0;
}
static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
unsigned long value;
value = readl(priv->io + KIRKWOOD_RECCTL);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
/* stop audio, enable interrupts */
value = readl(priv->io + KIRKWOOD_RECCTL);
value |= KIRKWOOD_RECCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_RECCTL);
value = readl(priv->io + KIRKWOOD_INT_MASK);
value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
writel(value, priv->io + KIRKWOOD_INT_MASK);
/* configure audio & enable i2s record */
value = readl(priv->io + KIRKWOOD_RECCTL);
value &= ~KIRKWOOD_RECCTL_BURST_MASK;
value &= ~KIRKWOOD_RECCTL_MONO;
value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_SPDIF_EN);
if (priv->burst == 32)
value |= KIRKWOOD_RECCTL_BURST_32;
else
value |= KIRKWOOD_RECCTL_BURST_128;
value |= KIRKWOOD_RECCTL_I2S_EN;
writel(value, priv->io + KIRKWOOD_RECCTL);
break;
case SNDRV_PCM_TRIGGER_STOP:
/* stop audio, disable interrupts */
value = readl(priv->io + KIRKWOOD_RECCTL);
value |= KIRKWOOD_RECCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_RECCTL);
value = readl(priv->io + KIRKWOOD_INT_MASK);
value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
writel(value, priv->io + KIRKWOOD_INT_MASK);
/* disable all records */
value = readl(priv->io + KIRKWOOD_RECCTL);
value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
writel(value, priv->io + KIRKWOOD_RECCTL);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_SUSPEND:
value = readl(priv->io + KIRKWOOD_RECCTL);
value |= KIRKWOOD_RECCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_RECCTL);
break;
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
value = readl(priv->io + KIRKWOOD_RECCTL);
value &= ~KIRKWOOD_RECCTL_PAUSE;
writel(value, priv->io + KIRKWOOD_RECCTL);
break;
default:
return -EINVAL;
break;
}
return 0;
}
static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
return kirkwood_i2s_play_trigger(substream, cmd, dai);
else
return kirkwood_i2s_rec_trigger(substream, cmd, dai);
return 0;
}
static int kirkwood_i2s_probe(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
unsigned long value;
unsigned int reg_data;
/* put system in a "safe" state : */
/* disable audio interrupts */
writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
writel(0, priv->io + KIRKWOOD_INT_MASK);
reg_data = readl(priv->io + 0x1200);
reg_data &= (~(0x333FF8));
reg_data |= 0x111D18;
writel(reg_data, priv->io + 0x1200);
msleep(500);
reg_data = readl(priv->io + 0x1200);
reg_data &= (~(0x333FF8));
reg_data |= 0x111D18;
writel(reg_data, priv->io + 0x1200);
/* disable playback/record */
value = readl(priv->io + KIRKWOOD_PLAYCTL);
value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
writel(value, priv->io + KIRKWOOD_PLAYCTL);
value = readl(priv->io + KIRKWOOD_RECCTL);
value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
writel(value, priv->io + KIRKWOOD_RECCTL);
return 0;
}
static void kirkwood_i2s_remove(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
}
static struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
.trigger = kirkwood_i2s_trigger,
.hw_params = kirkwood_i2s_hw_params,
.set_fmt = kirkwood_i2s_set_fmt,
};
struct snd_soc_dai kirkwood_i2s_dai = {
.name = DRV_NAME,
.id = 0,
.probe = kirkwood_i2s_probe,
.remove = kirkwood_i2s_remove,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = KIRKWOOD_I2S_RATES,
.formats = KIRKWOOD_I2S_FORMATS,},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = KIRKWOOD_I2S_RATES,
.formats = KIRKWOOD_I2S_FORMATS,},
.ops = &kirkwood_i2s_dai_ops,
};
EXPORT_SYMBOL_GPL(kirkwood_i2s_dai);
static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
{
struct resource *mem;
struct kirkwood_asoc_platform_data *data =
pdev->dev.platform_data;
int err;
priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "allocation failed\n");
err = -ENOMEM;
goto error;
}
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
dev_err(&pdev->dev, "platform_get_resource failed\n");
err = -ENXIO;
goto err_alloc;
}
priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
if (!priv->mem) {
dev_err(&pdev->dev, "request_mem_region failed\n");
err = -EBUSY;
goto error;
}
priv->io = ioremap(priv->mem->start, SZ_16K);
if (!priv->io) {
dev_err(&pdev->dev, "ioremap failed\n");
err = -ENOMEM;
goto err_iomem;
}
priv->irq = platform_get_irq(pdev, 0);
if (priv->irq <= 0) {
dev_err(&pdev->dev, "platform_get_irq failed\n");
err = -ENXIO;
goto err_ioremap;
}
if (!data || !data->dram) {
dev_err(&pdev->dev, "no platform data ?!\n");
err = -EINVAL;
goto err_ioremap;
}
priv->dram = data->dram;
priv->burst = data->burst;
kirkwood_i2s_dai.capture.dma_data = priv;
kirkwood_i2s_dai.playback.dma_data = priv;
return snd_soc_register_dai(&kirkwood_i2s_dai);
err_ioremap:
iounmap(priv->io);
err_iomem:
release_mem_region(priv->mem->start, SZ_16K);
err_alloc:
kfree(priv);
error:
return err;
}
static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
{
if (priv) {
iounmap(priv->io);
release_mem_region(priv->mem->start, SZ_16K);
kfree(priv);
}
snd_soc_unregister_dai(&kirkwood_i2s_dai);
return 0;
}
static struct platform_driver kirkwood_i2s_driver = {
.probe = kirkwood_i2s_dev_probe,
.remove = kirkwood_i2s_dev_remove,
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
static int __init kirkwood_i2s_init(void)
{
return platform_driver_register(&kirkwood_i2s_driver);
}
module_init(kirkwood_i2s_init);
static void __exit kirkwood_i2s_exit(void)
{
platform_driver_unregister(&kirkwood_i2s_driver);
}
module_exit(kirkwood_i2s_exit);
/* Module information */
MODULE_AUTHOR("Arnaud Patard, <apatard@mandriva.com>");
MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kirkwood-i2s");
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