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ASoC: mmp-sspa: Add support for soc-generic-dmaengine-pcm

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This makes the driver usable with the mmp_tdma drier via
soc-generic-dmaengine-pcm. This is conditionalized on DT node (support
for DT is added by a later patch).

A custom mmap callback that creates a NC mapping is used instead of the
default WC one, because with write-combining some bytes don't seem to
make it through for reasons unknown to me.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200511210134.1224532-6-lkundrak@v3.sk
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Lubomir Rintel 2020-05-11 23:01:28 +02:00 committed by Mark Brown
parent c9aeda1c94
commit 724da05378
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GPG Key ID: 24D68B725D5487D0
1 changed files with 57 additions and 0 deletions
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57
sound/soc/pxa/mmp-sspa.c
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@ -386,8 +386,54 @@ static struct snd_soc_dai_driver mmp_sspa_dai = {
.ops = &mmp_sspa_dai_ops,
};
#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
SNDRV_PCM_INFO_MMAP_VALID | \
SNDRV_PCM_INFO_INTERLEAVED | \
SNDRV_PCM_INFO_PAUSE | \
SNDRV_PCM_INFO_RESUME | \
SNDRV_PCM_INFO_NO_PERIOD_WAKEUP)
static const struct snd_pcm_hardware mmp_pcm_hardware[] = {
{
.info = MMP_PCM_INFO,
.period_bytes_min = 1024,
.period_bytes_max = 2048,
.periods_min = 2,
.periods_max = 32,
.buffer_bytes_max = 4096,
.fifo_size = 32,
},
{
.info = MMP_PCM_INFO,
.period_bytes_min = 1024,
.period_bytes_max = 2048,
.periods_min = 2,
.periods_max = 32,
.buffer_bytes_max = 4096,
.fifo_size = 32,
},
};
static const struct snd_dmaengine_pcm_config mmp_pcm_config = {
.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
.pcm_hardware = mmp_pcm_hardware,
.prealloc_buffer_size = 4096,
};
static int mmp_pcm_mmap(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return remap_pfn_range(vma, vma->vm_start,
substream->dma_buffer.addr >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
}
static const struct snd_soc_component_driver mmp_sspa_component = {
.name = "mmp-sspa",
.mmap = mmp_pcm_mmap,
};
static int asoc_mmp_sspa_probe(struct platform_device *pdev)
@ -425,10 +471,21 @@ static int asoc_mmp_sspa_probe(struct platform_device *pdev)
priv->dai_fmt = (unsigned int) -1;
platform_set_drvdata(pdev, priv);
priv->playback_dma_data.maxburst = 4;
priv->capture_dma_data.maxburst = 4;
/* You know, these addresses are actually ignored. */
priv->playback_dma_data.addr = SSPA_TXD;
priv->capture_dma_data.addr = SSPA_RXD;
if (pdev->dev.of_node) {
int ret;
ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
&mmp_pcm_config, 0);
if (ret)
return ret;
}
return devm_snd_soc_register_component(&pdev->dev, &mmp_sspa_component,
&mmp_sspa_dai, 1);
}