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authorStephen Warren <swarren@nvidia.com>2013-12-03 14:26:34 -0700
committerMark Brown <broonie@linaro.org>2013-12-09 18:45:01 +0000
commit194c7dea00c68c1b1f8ff26304fa937a006f66dd (patch)
tree5490b3298d3db2ae76ba2dbdc0ca8c7ffaefd3f4 /include/sound/dmaengine_pcm.h
parenta715d01e9c8177634bd7c22e67c9088282744569 (diff)
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op-kernel-dev-194c7dea00c68c1b1f8ff26304fa937a006f66dd.tar.gz
ASoC: dmaengine: add custom DMA config to snd_dmaengine_pcm_config
Add fields to struct snd_dmaengine_pcm_config to allow custom: - DMA channel names. This is useful when the default "tx" and "rx" channel names don't apply, for example if a HW module supports multiple channels, each having different DMA channel names. This is the case with the FIFOs in Tegra's AHUB. This new facility can replace SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME. - DMA device This allows requesting DMA channels for a device other than the device which is registering the "PCM" driver. This is quite unusual, but is currently useful on Tegra. In much HW, and in Tegra20, each DAI HW module contains its own FIFOs which DMA writes to. However, in Tegra30, the DMA FIFOs were split out AHUB HW module, which then routes the data through a cross-bar, and into the DAI HW modules. However, the current ASoC driver structure does not expose this detail, and acts as if the FIFOs are still part of the DAI HW modules. Consequently, the "PCM" driver is registered with the DAI HW module, yet the DMA channels must be looked up in the AHUB HW module's device tree node. This new config field allows that to happen. Eventually, the Tegra drivers will be reworked to fully expose the AHUB, and this config field can be removed. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'include/sound/dmaengine_pcm.h')
-rw-r--r--include/sound/dmaengine_pcm.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index 4ef986c..eb73a3a 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -114,6 +114,10 @@ void snd_dmaengine_pcm_set_config_from_dai_data(
* @compat_filter_fn: Will be used as the filter function when requesting a
* channel for platforms which do not use devicetree. The filter parameter
* will be the DAI's DMA data.
+ * @dma_dev: If set, request DMA channel on this device rather than the DAI
+ * device.
+ * @chan_names: If set, these custom DMA channel names will be requested at
+ * registration time.
* @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
* @prealloc_buffer_size: Size of the preallocated audio buffer.
*
@@ -130,6 +134,8 @@ struct snd_dmaengine_pcm_config {
struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_substream *substream);
dma_filter_fn compat_filter_fn;
+ struct device *dma_dev;
+ const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];
const struct snd_pcm_hardware *pcm_hardware;
unsigned int prealloc_buffer_size;
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