From 85c9f9c5f9d09ea43daf4f1a8b81d3c7b7394d27 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Wed, 3 Apr 2013 11:06:02 +0200 Subject: 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 Reviewed-by: Stephen Warren Tested-by: Stephen Warren Signed-off-by: Mark Brown --- include/sound/dmaengine_pcm.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'include/sound') 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 -- cgit v1.2.3