mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-12 21:44:06 +08:00
016ab467aa
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
248 lines
6.1 KiB
C
248 lines
6.1 KiB
C
/*
|
|
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
*
|
|
* Based on sound/soc/imx/imx-pcm-dma-mx2.c
|
|
*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/dmaengine.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/initval.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
|
|
#include <mach/dma.h>
|
|
#include "mxs-pcm.h"
|
|
|
|
struct mxs_pcm_dma_data {
|
|
struct mxs_dma_data dma_data;
|
|
struct mxs_pcm_dma_params *dma_params;
|
|
};
|
|
|
|
static struct snd_pcm_hardware snd_mxs_hardware = {
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_PAUSE |
|
|
SNDRV_PCM_INFO_RESUME |
|
|
SNDRV_PCM_INFO_INTERLEAVED,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
|
SNDRV_PCM_FMTBIT_S20_3LE |
|
|
SNDRV_PCM_FMTBIT_S24_LE,
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 8192,
|
|
.periods_min = 1,
|
|
.periods_max = 52,
|
|
.buffer_bytes_max = 64 * 1024,
|
|
.fifo_size = 32,
|
|
|
|
};
|
|
|
|
static bool filter(struct dma_chan *chan, void *param)
|
|
{
|
|
struct mxs_pcm_dma_data *pcm_dma_data = param;
|
|
struct mxs_pcm_dma_params *dma_params = pcm_dma_data->dma_params;
|
|
|
|
if (!mxs_dma_is_apbx(chan))
|
|
return false;
|
|
|
|
if (chan->chan_id != dma_params->chan_num)
|
|
return false;
|
|
|
|
chan->private = &pcm_dma_data->dma_data;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int snd_mxs_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_mxs_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct mxs_pcm_dma_data *pcm_dma_data;
|
|
int ret;
|
|
|
|
pcm_dma_data = kzalloc(sizeof(*pcm_dma_data), GFP_KERNEL);
|
|
if (pcm_dma_data == NULL)
|
|
return -ENOMEM;
|
|
|
|
pcm_dma_data->dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
|
|
pcm_dma_data->dma_data.chan_irq = pcm_dma_data->dma_params->chan_irq;
|
|
|
|
ret = snd_dmaengine_pcm_open(substream, filter, pcm_dma_data);
|
|
if (ret) {
|
|
kfree(pcm_dma_data);
|
|
return ret;
|
|
}
|
|
|
|
snd_soc_set_runtime_hwparams(substream, &snd_mxs_hardware);
|
|
|
|
snd_dmaengine_pcm_set_data(substream, pcm_dma_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_mxs_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct mxs_pcm_dma_data *pcm_dma_data = snd_dmaengine_pcm_get_data(substream);
|
|
|
|
snd_dmaengine_pcm_close(substream);
|
|
kfree(pcm_dma_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int snd_mxs_pcm_mmap(struct snd_pcm_substream *substream,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
|
runtime->dma_area,
|
|
runtime->dma_addr,
|
|
runtime->dma_bytes);
|
|
}
|
|
|
|
static struct snd_pcm_ops mxs_pcm_ops = {
|
|
.open = snd_mxs_open,
|
|
.close = snd_mxs_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = snd_mxs_pcm_hw_params,
|
|
.trigger = snd_dmaengine_pcm_trigger,
|
|
.pointer = snd_dmaengine_pcm_pointer,
|
|
.mmap = snd_mxs_pcm_mmap,
|
|
};
|
|
|
|
static int mxs_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
|
|
{
|
|
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
|
|
struct snd_dma_buffer *buf = &substream->dma_buffer;
|
|
size_t size = snd_mxs_hardware.buffer_bytes_max;
|
|
|
|
buf->dev.type = SNDRV_DMA_TYPE_DEV;
|
|
buf->dev.dev = pcm->card->dev;
|
|
buf->private_data = NULL;
|
|
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
|
|
&buf->addr, GFP_KERNEL);
|
|
if (!buf->area)
|
|
return -ENOMEM;
|
|
buf->bytes = size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u64 mxs_pcm_dmamask = DMA_BIT_MASK(32);
|
|
static int mxs_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
|
{
|
|
struct snd_card *card = rtd->card->snd_card;
|
|
struct snd_pcm *pcm = rtd->pcm;
|
|
int ret = 0;
|
|
|
|
if (!card->dev->dma_mask)
|
|
card->dev->dma_mask = &mxs_pcm_dmamask;
|
|
if (!card->dev->coherent_dma_mask)
|
|
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
|
|
|
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
|
|
ret = mxs_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
|
|
ret = mxs_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void mxs_pcm_free(struct snd_pcm *pcm)
|
|
{
|
|
struct snd_pcm_substream *substream;
|
|
struct snd_dma_buffer *buf;
|
|
int stream;
|
|
|
|
for (stream = 0; stream < 2; stream++) {
|
|
substream = pcm->streams[stream].substream;
|
|
if (!substream)
|
|
continue;
|
|
|
|
buf = &substream->dma_buffer;
|
|
if (!buf->area)
|
|
continue;
|
|
|
|
dma_free_writecombine(pcm->card->dev, buf->bytes,
|
|
buf->area, buf->addr);
|
|
buf->area = NULL;
|
|
}
|
|
}
|
|
|
|
static struct snd_soc_platform_driver mxs_soc_platform = {
|
|
.ops = &mxs_pcm_ops,
|
|
.pcm_new = mxs_pcm_new,
|
|
.pcm_free = mxs_pcm_free,
|
|
};
|
|
|
|
static int __devinit mxs_soc_platform_probe(struct platform_device *pdev)
|
|
{
|
|
return snd_soc_register_platform(&pdev->dev, &mxs_soc_platform);
|
|
}
|
|
|
|
static int __devexit mxs_soc_platform_remove(struct platform_device *pdev)
|
|
{
|
|
snd_soc_unregister_platform(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver mxs_pcm_driver = {
|
|
.driver = {
|
|
.name = "mxs-pcm-audio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = mxs_soc_platform_probe,
|
|
.remove = __devexit_p(mxs_soc_platform_remove),
|
|
};
|
|
|
|
module_platform_driver(mxs_pcm_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:mxs-pcm-audio");
|