ASoC: Add support for SPEAr ASoC pcm layer.
This patch add support for the SPEAr ASoC pcm layer in ASoC framework. The pcm layer uses common snd_dmaengine 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:
parent
3a9cf8efd7
commit
241b446f30
35
include/sound/spear_dma.h
Normal file
35
include/sound/spear_dma.h
Normal file
|
@ -0,0 +1,35 @@
|
|||
/*
|
||||
* linux/spear_dma.h
|
||||
*
|
||||
* 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 SPEAR_DMA_H
|
||||
#define SPEAR_DMA_H
|
||||
|
||||
#include <linux/dmaengine.h>
|
||||
|
||||
struct spear_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);
|
||||
};
|
||||
|
||||
#endif /* SPEAR_DMA_H */
|
214
sound/soc/spear/spear_pcm.c
Normal file
214
sound/soc/spear/spear_pcm.c
Normal file
|
@ -0,0 +1,214 @@
|
|||
/*
|
||||
* ALSA PCM interface for ST SPEAr Processors
|
||||
*
|
||||
* sound/soc/spear/spear_pcm.c
|
||||
*
|
||||
* Copyright (C) 2012 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/module.h>
|
||||
#include <linux/dmaengine.h>
|
||||
#include <linux/dma-mapping.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/scatterlist.h>
|
||||
#include <linux/slab.h>
|
||||
#include <sound/core.h>
|
||||
#include <sound/dmaengine_pcm.h>
|
||||
#include <sound/pcm.h>
|
||||
#include <sound/pcm_params.h>
|
||||
#include <sound/soc.h>
|
||||
#include <sound/spear_dma.h>
|
||||
|
||||
struct snd_pcm_hardware spear_pcm_hardware = {
|
||||
.info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
|
||||
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
|
||||
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
|
||||
.buffer_bytes_max = 16 * 1024, /* max buffer size */
|
||||
.period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
|
||||
.period_bytes_max = 2 * 1024, /* maximum period size */
|
||||
.periods_min = 1, /* min # periods */
|
||||
.periods_max = 8, /* max # of periods */
|
||||
.fifo_size = 0, /* fifo size in bytes */
|
||||
};
|
||||
|
||||
static int spear_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 spear_pcm_hw_free(struct snd_pcm_substream *substream)
|
||||
{
|
||||
snd_pcm_set_runtime_buffer(substream, NULL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int spear_pcm_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
||||
|
||||
struct spear_dma_data *dma_data = (struct spear_dma_data *)
|
||||
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
|
||||
int ret;
|
||||
|
||||
ret = snd_soc_set_runtime_hwparams(substream, &spear_pcm_hardware);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = snd_dmaengine_pcm_open(substream, dma_data->filter, dma_data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
snd_dmaengine_pcm_set_data(substream, dma_data);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int spear_pcm_close(struct snd_pcm_substream *substream)
|
||||
{
|
||||
|
||||
snd_dmaengine_pcm_close(substream);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int spear_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 spear_pcm_ops = {
|
||||
.open = spear_pcm_open,
|
||||
.close = spear_pcm_close,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = spear_pcm_hw_params,
|
||||
.hw_free = spear_pcm_hw_free,
|
||||
.trigger = snd_dmaengine_pcm_trigger,
|
||||
.pointer = snd_dmaengine_pcm_pointer,
|
||||
.mmap = spear_pcm_mmap,
|
||||
};
|
||||
|
||||
static int
|
||||
spear_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
|
||||
size_t size)
|
||||
{
|
||||
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
|
||||
struct snd_dma_buffer *buf = &substream->dma_buffer;
|
||||
|
||||
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;
|
||||
|
||||
dev_info(buf->dev.dev,
|
||||
" preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
|
||||
(void *)buf->area, (void *)buf->addr, size);
|
||||
|
||||
buf->bytes = size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void spear_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 && !buf->area)
|
||||
continue;
|
||||
|
||||
dma_free_writecombine(pcm->card->dev, buf->bytes,
|
||||
buf->area, buf->addr);
|
||||
buf->area = NULL;
|
||||
}
|
||||
}
|
||||
|
||||
static u64 spear_pcm_dmamask = DMA_BIT_MASK(32);
|
||||
|
||||
static int spear_pcm_new(struct snd_card *card,
|
||||
struct snd_soc_dai *dai, struct snd_pcm *pcm)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (!card->dev->dma_mask)
|
||||
card->dev->dma_mask = &spear_pcm_dmamask;
|
||||
if (!card->dev->coherent_dma_mask)
|
||||
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
|
||||
|
||||
if (dai->driver->playback.channels_min) {
|
||||
ret = spear_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_PLAYBACK,
|
||||
spear_pcm_hardware.buffer_bytes_max);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (dai->driver->capture.channels_min) {
|
||||
ret = spear_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_CAPTURE,
|
||||
spear_pcm_hardware.buffer_bytes_max);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct snd_soc_platform_driver spear_soc_platform = {
|
||||
.ops = &spear_pcm_ops,
|
||||
.pcm_new = spear_pcm_new,
|
||||
.pcm_free = spear_pcm_free,
|
||||
};
|
||||
|
||||
static int __devinit spear_soc_platform_probe(struct platform_device *pdev)
|
||||
{
|
||||
return snd_soc_register_platform(&pdev->dev, &spear_soc_platform);
|
||||
}
|
||||
|
||||
static int __devexit spear_soc_platform_remove(struct platform_device *pdev)
|
||||
{
|
||||
snd_soc_unregister_platform(&pdev->dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver spear_pcm_driver = {
|
||||
.driver = {
|
||||
.name = "spear-pcm-audio",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
|
||||
.probe = spear_soc_platform_probe,
|
||||
.remove = __devexit_p(spear_soc_platform_remove),
|
||||
};
|
||||
|
||||
module_platform_driver(spear_pcm_driver);
|
||||
|
||||
MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
|
||||
MODULE_DESCRIPTION("SPEAr PCM DMA module");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:spear-pcm-audio");
|
Loading…
Reference in a new issue