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Subject[PATCH 3/3] ASoC: tegra: use core/pcm library for pcm buffer allocation
Date
The soc/core support the APIs for allocate and deallocate the
writecombine dma buffer for pcm substream.
Use these APIs and remove the local implementation for achieving
these functionalities.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
sound/soc/tegra/tegra_pcm.c | 92 ++-----------------------------------------
1 files changed, 4 insertions(+), 88 deletions(-)
diff --git a/sound/soc/tegra/tegra_pcm.c b/sound/soc/tegra/tegra_pcm.c
index 127348d..6754697 100644
--- a/sound/soc/tegra/tegra_pcm.c
+++ b/sound/soc/tegra/tegra_pcm.c
@@ -263,18 +263,6 @@ static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
return prtd->period_index * runtime->period_size;
}

-
-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 = tegra_pcm_close,
@@ -283,91 +271,19 @@ static struct snd_pcm_ops tegra_pcm_ops = {
.hw_free = tegra_pcm_hw_free,
.trigger = tegra_pcm_trigger,
.pointer = tegra_pcm_pointer,
- .mmap = tegra_pcm_mmap,
+ .mmap = snd_pcm_lib_mmap_writecombine_dma_buffer,
};

-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);
+ return snd_soc_pcm_new_writecombine_dma_buffer(rtd,
+ tegra_pcm_hardware.buffer_bytes_max);
}

static struct snd_soc_platform_driver tegra_pcm_platform = {
.ops = &tegra_pcm_ops,
.pcm_new = tegra_pcm_new,
- .pcm_free = tegra_pcm_free,
+ .pcm_free = snd_soc_pcm_free_writecombine_dma_buffer,
};

int __devinit tegra_pcm_platform_register(struct device *dev)
--
1.7.1.1


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