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ASoC: Add support for synopsys i2s controller as per ASoC framework. 

This patch add support for synopsys I2S controller as per the ASoC
framework.

Signed-off-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Rajeev Kumar 2012-06-21 15:54:51 +05:30 committed by Mark Brown
parent f4a6348391
commit 3a9cf8efd7
6 changed files with 536 additions and 0 deletions
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69
include/sound/designware_i2s.h Normal file
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@ -0,0 +1,69 @@
/*
* Copyright (ST) 2012 Rajeev Kumar (rajeev-dlh.kumar@st.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef __SOUND_DESIGNWARE_I2S_H
#define __SOUND_DESIGNWARE_I2S_H
#include <linux/dmaengine.h>
#include <linux/types.h>
/*
* struct i2s_clk_config_data - represent i2s clk configuration data
* @chan_nr: number of channel
* @data_width: number of bits per sample (8/16/24/32 bit)
* @sample_rate: sampling frequency (8Khz, 16Khz, 32Khz, 44Khz, 48Khz)
*/
struct i2s_clk_config_data {
int chan_nr;
u32 data_width;
u32 sample_rate;
};
struct i2s_platform_data {
#define DWC_I2S_PLAY (1 << 0)
#define DWC_I2S_RECORD (1 << 1)
unsigned int cap;
int channel;
u32 snd_fmts;
u32 snd_rates;
void *play_dma_data;
void *capture_dma_data;
bool (*filter)(struct dma_chan *chan, void *slave);
int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
};
struct i2s_dma_data {
void *data;
dma_addr_t addr;
u32 max_burst;
enum dma_slave_buswidth addr_width;
bool (*filter)(struct dma_chan *chan, void *slave);
};
/* I2S DMA registers */
#define I2S_RXDMA 0x01C0
#define I2S_TXDMA 0x01C8
#define TWO_CHANNEL_SUPPORT 2 /* up to 2.0 */
#define FOUR_CHANNEL_SUPPORT 4 /* up to 3.1 */
#define SIX_CHANNEL_SUPPORT 6 /* up to 5.1 */
#define EIGHT_CHANNEL_SUPPORT 8 /* up to 7.1 */
#endif /* __SOUND_DESIGNWARE_I2S_H */

1
sound/soc/Kconfig
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@ -33,6 +33,7 @@ source "sound/soc/atmel/Kconfig"
source "sound/soc/au1x/Kconfig"
source "sound/soc/blackfin/Kconfig"
source "sound/soc/davinci/Kconfig"
source "sound/soc/dwc/Kconfig"
source "sound/soc/ep93xx/Kconfig"
source "sound/soc/fsl/Kconfig"
source "sound/soc/jz4740/Kconfig"

1
sound/soc/Makefile
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@ -11,6 +11,7 @@ obj-$(CONFIG_SND_SOC) += atmel/
obj-$(CONFIG_SND_SOC) += au1x/
obj-$(CONFIG_SND_SOC) += blackfin/
obj-$(CONFIG_SND_SOC) += davinci/
obj-$(CONFIG_SND_SOC) += dwc/
obj-$(CONFIG_SND_SOC) += ep93xx/
obj-$(CONFIG_SND_SOC) += fsl/
obj-$(CONFIG_SND_SOC) += jz4740/

8
sound/soc/dwc/Kconfig Normal file
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@ -0,0 +1,8 @@
config SND_DESIGNWARE_I2S
tristate "Synopsys I2S Device Driver"
help
Say Y or M if you want to add support for I2S driver for
Synopsys desigwnware I2S device. The device supports upto
maximum of 8 channels each for play and record.

3
sound/soc/dwc/Makefile Normal file
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@ -0,0 +1,3 @@
# SYNOPSYS Platform Support
obj-$(CONFIG_SND_DESIGNWARE_I2S) += designware_i2s.o

454
sound/soc/dwc/designware_i2s.c Normal file
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@ -0,0 +1,454 @@
/*
* ALSA SoC Synopsys I2S Audio Layer
*
* sound/soc/spear/designware_i2s.c
*
* Copyright (C) 2010 ST Microelectronics
* Rajeev Kumar <rajeev-dlh.kumar@st.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <sound/designware_i2s.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
/* common register for all channel */
#define IER 0x000
#define IRER 0x004
#define ITER 0x008
#define CER 0x00C
#define CCR 0x010
#define RXFFR 0x014
#define TXFFR 0x018
/* I2STxRxRegisters for all channels */
#define LRBR_LTHR(x) (0x40 * x + 0x020)
#define RRBR_RTHR(x) (0x40 * x + 0x024)
#define RER(x) (0x40 * x + 0x028)
#define TER(x) (0x40 * x + 0x02C)
#define RCR(x) (0x40 * x + 0x030)
#define TCR(x) (0x40 * x + 0x034)
#define ISR(x) (0x40 * x + 0x038)
#define IMR(x) (0x40 * x + 0x03C)
#define ROR(x) (0x40 * x + 0x040)
#define TOR(x) (0x40 * x + 0x044)
#define RFCR(x) (0x40 * x + 0x048)
#define TFCR(x) (0x40 * x + 0x04C)
#define RFF(x) (0x40 * x + 0x050)
#define TFF(x) (0x40 * x + 0x054)
/* I2SCOMPRegisters */
#define I2S_COMP_PARAM_2 0x01F0
#define I2S_COMP_PARAM_1 0x01F4
#define I2S_COMP_VERSION 0x01F8
#define I2S_COMP_TYPE 0x01FC
#define MAX_CHANNEL_NUM 8
#define MIN_CHANNEL_NUM 2
struct dw_i2s_dev {
void __iomem *i2s_base;
struct clk *clk;
int active;
unsigned int capability;
struct device *dev;
/* data related to DMA transfers b/w i2s and DMAC */
struct i2s_dma_data play_dma_data;
struct i2s_dma_data capture_dma_data;
struct i2s_clk_config_data config;
int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
};
static inline void i2s_write_reg(void *io_base, int reg, u32 val)
{
writel(val, io_base + reg);
}
static inline u32 i2s_read_reg(void *io_base, int reg)
{
return readl(io_base + reg);
}
static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
{
u32 i = 0;
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
for (i = 0; i < 4; i++)
i2s_write_reg(dev->i2s_base, TER(i), 0);
} else {
for (i = 0; i < 4; i++)
i2s_write_reg(dev->i2s_base, RER(i), 0);
}
}
static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
{
u32 i = 0;
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
for (i = 0; i < 4; i++)
i2s_write_reg(dev->i2s_base, TOR(i), 0);
} else {
for (i = 0; i < 4; i++)
i2s_write_reg(dev->i2s_base, ROR(i), 0);
}
}
void i2s_start(struct dw_i2s_dev *dev, struct snd_pcm_substream *substream)
{
i2s_write_reg(dev->i2s_base, IER, 1);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
i2s_write_reg(dev->i2s_base, ITER, 1);
else
i2s_write_reg(dev->i2s_base, IRER, 1);
i2s_write_reg(dev->i2s_base, CER, 1);
}
static void i2s_stop(struct dw_i2s_dev *dev,
struct snd_pcm_substream *substream)
{
u32 i = 0, irq;
i2s_clear_irqs(dev, substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_write_reg(dev->i2s_base, ITER, 0);
for (i = 0; i < 4; i++) {
irq = i2s_read_reg(dev->i2s_base, IMR(i));
i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x30);
}
} else {
i2s_write_reg(dev->i2s_base, IRER, 0);
for (i = 0; i < 4; i++) {
irq = i2s_read_reg(dev->i2s_base, IMR(i));
i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x03);
}
}
if (!dev->active) {
i2s_write_reg(dev->i2s_base, CER, 0);
i2s_write_reg(dev->i2s_base, IER, 0);
}
}
static int dw_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
struct i2s_dma_data *dma_data = NULL;
if (!(dev->capability & DWC_I2S_RECORD) &&
(substream->stream == SNDRV_PCM_STREAM_CAPTURE))
return -EINVAL;
if (!(dev->capability & DWC_I2S_PLAY) &&
(substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
return -EINVAL;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dma_data = &dev->play_dma_data;
else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
dma_data = &dev->capture_dma_data;
snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);
return 0;
}
static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
struct i2s_clk_config_data *config = &dev->config;
u32 ccr, xfer_resolution, ch_reg, irq;
int ret;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
config->data_width = 16;
ccr = 0x00;
xfer_resolution = 0x02;
break;
case SNDRV_PCM_FORMAT_S24_LE:
config->data_width = 24;
ccr = 0x08;
xfer_resolution = 0x04;
break;
case SNDRV_PCM_FORMAT_S32_LE:
config->data_width = 32;
ccr = 0x10;
xfer_resolution = 0x05;
break;
default:
dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
return -EINVAL;
}
config->chan_nr = params_channels(params);
switch (config->chan_nr) {
case EIGHT_CHANNEL_SUPPORT:
ch_reg = 3;
case SIX_CHANNEL_SUPPORT:
ch_reg = 2;
case FOUR_CHANNEL_SUPPORT:
ch_reg = 1;
case TWO_CHANNEL_SUPPORT:
ch_reg = 0;
break;
default:
dev_err(dev->dev, "channel not supported\n");
}
i2s_disable_channels(dev, substream->stream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
i2s_write_reg(dev->i2s_base, TCR(ch_reg), xfer_resolution);
i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
} else {
i2s_write_reg(dev->i2s_base, RCR(ch_reg), xfer_resolution);
i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
}
i2s_write_reg(dev->i2s_base, CCR, ccr);
config->sample_rate = params_rate(params);
if (!dev->i2s_clk_cfg)
return -EINVAL;
ret = dev->i2s_clk_cfg(config);
if (ret < 0) {
dev_err(dev->dev, "runtime audio clk config fail\n");
return ret;
}
return 0;
}
static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
snd_soc_dai_set_dma_data(dai, substream, NULL);
}
static int dw_i2s_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
dev->active++;
i2s_start(dev, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
dev->active--;
i2s_stop(dev, substream);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static struct snd_soc_dai_ops dw_i2s_dai_ops = {
.startup = dw_i2s_startup,
.shutdown = dw_i2s_shutdown,
.hw_params = dw_i2s_hw_params,
.trigger = dw_i2s_trigger,
};
#ifdef CONFIG_PM
static int dw_i2s_suspend(struct snd_soc_dai *dai)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
clk_disable(dev->clk);
return 0;
}
static int dw_i2s_resume(struct snd_soc_dai *dai)
{
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
clk_enable(dev->clk);
return 0;
}
#else
#define dw_i2s_suspend NULL
#define dw_i2s_resume NULL
#endif
static int dw_i2s_probe(struct platform_device *pdev)
{
const struct i2s_platform_data *pdata = pdev->dev.platform_data;
struct dw_i2s_dev *dev;
struct resource *res;
int ret;
unsigned int cap;
struct snd_soc_dai_driver *dw_i2s_dai;
if (!pdata) {
dev_err(&pdev->dev, "Invalid platform data\n");
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no i2s resource defined\n");
return -ENODEV;
}
if (!devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name)) {
dev_err(&pdev->dev, "i2s region already claimed\n");
return -EBUSY;
}
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev) {
dev_warn(&pdev->dev, "kzalloc fail\n");
return -ENOMEM;
}
dev->i2s_base = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
if (!dev->i2s_base) {
dev_err(&pdev->dev, "ioremap fail for i2s_region\n");
return -ENOMEM;
}
cap = pdata->cap;
dev->capability = cap;
dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
/* Set DMA slaves info */
dev->play_dma_data.data = pdata->play_dma_data;
dev->capture_dma_data.data = pdata->capture_dma_data;
dev->play_dma_data.addr = res->start + I2S_TXDMA;
dev->capture_dma_data.addr = res->start + I2S_RXDMA;
dev->play_dma_data.max_burst = 16;
dev->capture_dma_data.max_burst = 16;
dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
dev->play_dma_data.filter = pdata->filter;
dev->capture_dma_data.filter = pdata->filter;
dev->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk))
return PTR_ERR(dev->clk);
ret = clk_enable(dev->clk);
if (ret < 0)
goto err_clk_put;
dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
if (!dw_i2s_dai) {
dev_err(&pdev->dev, "mem allocation failed for dai driver\n");
ret = -ENOMEM;
goto err_clk_disable;
}
if (cap & DWC_I2S_PLAY) {
dev_dbg(&pdev->dev, " SPEAr: play supported\n");
dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
dw_i2s_dai->playback.channels_max = pdata->channel;
dw_i2s_dai->playback.formats = pdata->snd_fmts;
dw_i2s_dai->playback.rates = pdata->snd_rates;
}
if (cap & DWC_I2S_RECORD) {
dev_dbg(&pdev->dev, "SPEAr: record supported\n");
dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
dw_i2s_dai->capture.channels_max = pdata->channel;
dw_i2s_dai->capture.formats = pdata->snd_fmts;
dw_i2s_dai->capture.rates = pdata->snd_rates;
}
dw_i2s_dai->ops = &dw_i2s_dai_ops;
dw_i2s_dai->suspend = dw_i2s_suspend;
dw_i2s_dai->resume = dw_i2s_resume;
dev->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, dev);
ret = snd_soc_register_dai(&pdev->dev, dw_i2s_dai);
if (ret != 0) {
dev_err(&pdev->dev, "not able to register dai\n");
goto err_set_drvdata;
}
return 0;
err_set_drvdata:
dev_set_drvdata(&pdev->dev, NULL);
err_clk_disable:
clk_disable(dev->clk);
err_clk_put:
clk_put(dev->clk);
return ret;
}
static int dw_i2s_remove(struct platform_device *pdev)
{
struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
snd_soc_unregister_dai(&pdev->dev);
dev_set_drvdata(&pdev->dev, NULL);
clk_put(dev->clk);
return 0;
}
static struct platform_driver dw_i2s_driver = {
.probe = dw_i2s_probe,
.remove = dw_i2s_remove,
.driver = {
.name = "designware-i2s",
.owner = THIS_MODULE,
},
};
module_platform_driver(dw_i2s_driver);
MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:designware_i2s");