/*
* ALSA SoC Voice Codec Interface for TI DAVINCI processor
*
* Copyright (C) 2010 Texas Instruments.
*
* Author: Miguel Aguilar <miguel.aguilar@ridgerun.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
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/mfd/davinci_voicecodec.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include "davinci-pcm.h"
#include "davinci-i2s.h"
#define MOD_REG_BIT(val, mask, set) do { \
if (set) { \
val |= mask; \
} else { \
val &= ~mask; \
} \
} while (0)
struct davinci_vcif_dev {
struct davinci_vc *davinci_vc;
struct davinci_pcm_dma_params dma_params[2];
};
static void davinci_vcif_start(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct davinci_vcif_dev *davinci_vcif_dev =
snd_soc_dai_get_drvdata(rtd->cpu_dai);
struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
u32 w;
/* Start the sample generator and enable transmitter/receiver */
w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 1);
else
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 1);
writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
}
static void davinci_vcif_stop(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct davinci_vcif_dev *davinci_vcif_dev =
snd_soc_dai_get_drvdata(rtd->cpu_dai);
struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
u32 w;
/* Reset transmitter/receiver and sample rate/frame sync generators */
w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTDAC, 0);
else
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RSTADC, 0);
writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
}
static int davinci_vcif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct davinci_vcif_dev *davinci_vcif_dev = snd_soc_dai_get_drvdata(dai);
struct davinci_vc *davinci_vc = davinci_vcif_dev->davinci_vc;
struct davinci_pcm_dma_params *dma_params =
&davinci_vcif_dev->dma_params[substream->stream];
u32 w;
/* Restart the codec before setup */
davinci_vcif_stop(substream);
davinci_vcif_start(substream);
/* General line settings */
writel(DAVINCI_VC_CTRL_MASK, davinci_vc->base + DAVINCI_VC_CTRL);
writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTCLR);
writel(DAVINCI_VC_INT_MASK, davinci_vc->base + DAVINCI_VC_INTEN);
w = readl(davinci_vc->base + DAVINCI_VC_CTRL);
/* Determine xfer data type */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_U8:
dma_params->data_type = 0;
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
DAVINCI_VC_CTRL_RD_UNSIGNED |
DAVINCI_VC_CTRL_WD_BITS_8 |
DAVINCI_VC_CTRL_WD_UNSIGNED, 1);
break;
case SNDRV_PCM_FORMAT_S8:
dma_params->data_type = 1;
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
DAVINCI_VC_CTRL_WD_BITS_8, 1);
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_UNSIGNED |
DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
break;
case SNDRV_PCM_FORMAT_S16_LE:
dma_params->data_type = 2;
MOD_REG_BIT(w, DAVINCI_VC_CTRL_RD_BITS_8 |
DAVINCI_VC_CTRL_RD_UNSIGNED |
DAVINCI_VC_CTRL_WD_BITS_8 |
DAVINCI_VC_CTRL_WD_UNSIGNED, 0);
break;
default:
printk(KERN_WARNING "davinci-vcif: unsupported PCM format");
return -EINVAL;
}
dma_params->acnt = dma_params->data_type;
writel(w, davinci_vc->base + DAVINCI_VC_CTRL);
return 0;
}
static int davinci_vcif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
davinci_vcif_start(substream);
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
davinci_vcif_stop(substream);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int davinci_vcif_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct davinci_vcif_dev *dev = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_set_dma_data(dai, substream, dev->dma_params);
return 0;
}
#define DAVINCI_VCIF_RATES SNDRV_PCM_RATE_8000_48000
static struct snd_soc_dai_ops davinci_vcif_dai_ops = {
.startup = davinci_vcif_startup,
.trigger = davinci_vcif_trigger,
.hw_params = davinci_vcif_hw_params,
};
static struct snd_soc_dai_driver davinci_vcif_dai = {
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = DAVINCI_VCIF_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = DAVINCI_VCIF_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.ops = &davinci_vcif_dai_ops,
};
static int davinci_vcif_probe(struct platform_device *pdev)
{
struct davinci_vc *davinci_vc = pdev->dev.platform_data;
struct davinci_vcif_dev *davinci_vcif_dev;
int ret;
davinci_vcif_dev = kzalloc(sizeof(struct davinci_vcif_dev), GFP_KERNEL);
if (!davinci_vcif_dev) {
dev_dbg(&pdev->dev,
"could not allocate memory for private data\n");
return -ENOMEM;
}
/* DMA tx params */
davinci_vcif_dev->davinci_vc = davinci_vc;
davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].channel =
davinci_vc->davinci_vcif.dma_tx_channel;
davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK].dma_addr =
davinci_vc->davinci_vcif.dma_tx_addr;
/* DMA rx params */
davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].channel =
davinci_vc->davinci_vcif.dma_rx_channel;
davinci_vcif_dev->dma_params[SNDRV_PCM_STREAM_CAPTURE].dma_addr =
davinci_vc->davinci_vcif.dma_rx_addr;
dev_set_drvdata(&pdev->dev, davinci_vcif_dev);
ret = snd_soc_register_dai(&pdev->dev, &davinci_vcif_dai);
if (ret != 0) {
dev_err(&pdev->dev, "could not register dai\n");
goto fail;
}
return 0;
fail:
kfree(davinci_vcif_dev);
return ret;
}
static int davinci_vcif_remove(struct platform_device *pdev)
{
struct davinci_vcif_dev *davinci_vcif_dev = dev_get_drvdata(&pdev->dev);
snd_soc_unregister_dai(&pdev->dev);
kfree(davinci_vcif_dev);
return 0;
}
static struct platform_driver davinci_vcif_driver = {
.probe = davinci_vcif_probe,
.remove = davinci_vcif_remove,
.driver = {
.name = "davinci-vcif",
.owner = THIS_MODULE,
},
};
static int __init davinci_vcif_init(void)
{
return platform_driver_probe(&davinci_vcif_driver, davinci_vcif_probe);
}
module_init(davinci_vcif_init);
static void __exit davinci_vcif_exit(void)
{
platform_driver_unregister(&davinci_vcif_driver);
}
module_exit(davinci_vcif_exit);
MODULE_AUTHOR("Miguel Aguilar");
MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC Voice Codec Interface");
MODULE_LICENSE("GPL");
