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ASoC: tegra: Use generic dmaengine PCM

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Use the generic dmaengine PCM driver instead of a custom implementation.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Lars-Peter Clausen 2013-04-15 19:19:52 +02:00 committed by Mark Brown
parent 753e23ea58
commit 11a8576a0a
2 changed files with 10 additions and 163 deletions
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2
sound/soc/tegra/Kconfig
View file

@ -2,7 +2,7 @@ config SND_SOC_TEGRA
tristate "SoC Audio for the Tegra System-on-Chip"
depends on ARCH_TEGRA && TEGRA20_APB_DMA
select REGMAP_MMIO
select SND_SOC_DMAENGINE_PCM if TEGRA20_APB_DMA
select SND_SOC_GENERIC_DMAENGINE_PCM if TEGRA20_APB_DMA
help
Say Y or M here if you want support for SoC audio on Tegra.

171
sound/soc/tegra/tegra_pcm.c
View file

@ -29,9 +29,7 @@
*
*/
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
@ -55,175 +53,24 @@ static const struct snd_pcm_hardware tegra_pcm_hardware = {
.fifo_size = 4,
};
static int tegra_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct device *dev = rtd->platform->dev;
int ret;
/* Set HW params now that initialization is complete */
snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
ret = snd_dmaengine_pcm_open_request_chan(substream, NULL, NULL);
if (ret) {
dev_err(dev, "dmaengine pcm open failed with err %d\n", ret);
return ret;
}
return 0;
}
static int tegra_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct device *dev = rtd->platform->dev;
struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
struct dma_slave_config slave_config;
int ret;
ret = snd_hwparams_to_dma_slave_config(substream, params,
&slave_config);
if (ret) {
dev_err(dev, "hw params config failed with err %d\n", ret);
return ret;
}
snd_dmaengine_pcm_set_config_from_dai_data(substream,
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
&slave_config);
ret = dmaengine_slave_config(chan, &slave_config);
if (ret < 0) {
dev_err(dev, "dma slave config failed with err %d\n", ret);
return ret;
}
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
return 0;
}
static int tegra_pcm_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int tegra_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 tegra_pcm_ops = {
.open = tegra_pcm_open,
.close = snd_dmaengine_pcm_close_release_chan,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = tegra_pcm_hw_params,
.hw_free = tegra_pcm_hw_free,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer,
.mmap = tegra_pcm_mmap,
};
static int tegra_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 = tegra_pcm_hardware.buffer_bytes_max;
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
if (!buf->area)
return -ENOMEM;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
buf->private_data = NULL;
buf->bytes = size;
return 0;
}
static void tegra_pcm_deallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
struct snd_pcm_substream *substream;
struct snd_dma_buffer *buf;
substream = pcm->streams[stream].substream;
if (!substream)
return;
buf = &substream->dma_buffer;
if (!buf->area)
return;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
static u64 tegra_dma_mask = DMA_BIT_MASK(32);
static int tegra_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 = &tegra_dma_mask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
ret = tegra_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
goto err;
}
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
ret = tegra_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE);
if (ret)
goto err_free_play;
}
return 0;
err_free_play:
tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
err:
return ret;
}
static void tegra_pcm_free(struct snd_pcm *pcm)
{
tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_CAPTURE);
tegra_pcm_deallocate_dma_buffer(pcm, SNDRV_PCM_STREAM_PLAYBACK);
}
static struct snd_soc_platform_driver tegra_pcm_platform = {
.ops = &tegra_pcm_ops,
.pcm_new = tegra_pcm_new,
.pcm_free = tegra_pcm_free,
static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
.pcm_hardware = &tegra_pcm_hardware,
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
.compat_filter_fn = NULL,
.prealloc_buffer_size = PAGE_SIZE * 8,
};
int tegra_pcm_platform_register(struct device *dev)
{
return snd_soc_register_platform(dev, &tegra_pcm_platform);
return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config,
SND_DMAENGINE_PCM_FLAG_NO_DT |
SND_DMAENGINE_PCM_FLAG_COMPAT);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
void tegra_pcm_platform_unregister(struct device *dev)
{
snd_soc_unregister_platform(dev);
return snd_dmaengine_pcm_unregister(dev);
}
EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);