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 --- sound/soc/soc-dmaengine-pcm.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'sound/soc/soc-dmaengine-pcm.c') diff --git a/sound/soc/soc-dmaengine-pcm.c b/sound/soc/soc-dmaengine-pcm.c index 7c24dedff971..a9a300acb506 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; -- cgit v1.2.3