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authorLars-Peter Clausen <lars@metafoo.de>2013-04-03 13:06:02 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-03 21:12:33 +0400
commit85c9f9c5f9d09ea43daf4f1a8b81d3c7b7394d27 (patch)
tree832dd28c2f8e763d4a9fc62559db8454af04abef /include/sound
parent5fa70f71dbf33603b0d29b33d8da128b266eb733 (diff)
downloadlinux-85c9f9c5f9d09ea43daf4f1a8b81d3c7b7394d27.tar.xz
ASoC: dmaengine-pcm: Add a common DAI DMA data struct
This patch adds a common DMA data struct which can be used by DAI drivers to communicate their DMA configuration requirements to the DMA pcm driver. Having a common data structure for this allows us to implement common functions on top of them, which can be used by multiple platforms. This patch also introduces a new function to initialize certain fields of a dma_slave_config struct from the common DAI DMA data struct. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Stephen Warren <swarren@nvidia.com> Tested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'include/sound')
-rw-r--r--include/sound/dmaengine_pcm.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/sound/dmaengine_pcm.h b/include/sound/dmaengine_pcm.h
index f8a70312adb8..95620428a59b 100644
--- a/include/sound/dmaengine_pcm.h
+++ b/include/sound/dmaengine_pcm.h
@@ -44,4 +44,28 @@ int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
+/**
+ * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data
+ * @addr: Address of the DAI data source or destination register.
+ * @addr_width: Width of the DAI data source or destination register.
+ * @maxburst: Maximum number of words(note: words, as in units of the
+ * src_addr_width member, not bytes) that can be send to or received from the
+ * DAI in one burst.
+ * @slave_id: Slave requester id for the DMA channel.
+ * @filter_data: Custom DMA channel filter data, this will usually be used when
+ * requesting the DMA channel.
+ */
+struct snd_dmaengine_dai_dma_data {
+ dma_addr_t addr;
+ enum dma_slave_buswidth addr_width;
+ u32 maxburst;
+ unsigned int slave_id;
+ void *filter_data;
+};
+
+void snd_dmaengine_pcm_set_config_from_dai_data(
+ const struct snd_pcm_substream *substream,
+ const struct snd_dmaengine_dai_dma_data *dma_data,
+ struct dma_slave_config *config);
+
#endif