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author | Lars-Peter Clausen <lars@metafoo.de> | 2013-04-03 11:06:02 +0200 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-03 18:12:33 +0100 |
commit | 85c9f9c5f9d09ea43daf4f1a8b81d3c7b7394d27 (patch) | |
tree | 832dd28c2f8e763d4a9fc62559db8454af04abef /sound | |
parent | 5fa70f71dbf33603b0d29b33d8da128b266eb733 (diff) | |
download | op-kernel-dev-85c9f9c5f9d09ea43daf4f1a8b81d3c7b7394d27.zip op-kernel-dev-85c9f9c5f9d09ea43daf4f1a8b81d3c7b7394d27.tar.gz |
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 'sound')
-rw-r--r-- | sound/soc/soc-dmaengine-pcm.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c index 7c24ded..a9a300a 100644 --- a/sound/soc/soc-dmaengine-pcm.c +++ b/sound/soc/soc-dmaengine-pcm.c @@ -95,6 +95,43 @@ int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, } EXPORT_SYMBOL_GPL(snd_hwparams_to_dma_slave_config); +/** + * snd_dmaengine_pcm_set_config_from_dai_data() - Initializes a dma slave config + * using DAI DMA data. + * @substream: PCM substream + * @dma_data: DAI DMA data + * @slave_config: DMA slave configuration + * + * Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and + * slave_id fields of the DMA slave config from the same fields of the DAI DMA + * data struct. The src and dst fields will be initialized depending on the + * direction of the substream. If the substream is a playback stream the dst + * fields will be initialized, if it is a capture stream the src fields will be + * initialized. The {dst,src}_addr_width field will only be initialized if the + * addr_width field of the DAI DMA data struct is not equal to + * DMA_SLAVE_BUSWIDTH_UNDEFINED. + */ +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 *slave_config) +{ + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + slave_config->dst_addr = dma_data->addr; + slave_config->dst_maxburst = dma_data->maxburst; + if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) + slave_config->dst_addr_width = dma_data->addr_width; + } else { + slave_config->src_addr = dma_data->addr; + slave_config->src_maxburst = dma_data->maxburst; + if (dma_data->addr_width != DMA_SLAVE_BUSWIDTH_UNDEFINED) + slave_config->src_addr_width = dma_data->addr_width; + } + + slave_config->slave_id = dma_data->slave_id; +} +EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_set_config_from_dai_data); + static void dmaengine_pcm_dma_complete(void *arg) { struct snd_pcm_substream *substream = arg; |