| /* |
| * Copyright (C) 2012, Analog Devices Inc. |
| * Author: Lars-Peter Clausen <lars@metafoo.de> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 675 Mass Ave, Cambridge, MA 02139, USA. |
| * |
| */ |
| #ifndef __SOUND_DMAENGINE_PCM_H__ |
| #define __SOUND_DMAENGINE_PCM_H__ |
| |
| #include <sound/pcm.h> |
| #include <linux/dmaengine.h> |
| |
| /** |
| * snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM |
| * substream |
| * @substream: PCM substream |
| */ |
| static inline enum dma_transfer_direction |
| snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream) |
| { |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| return DMA_MEM_TO_DEV; |
| else |
| return DMA_DEV_TO_MEM; |
| } |
| |
| int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, |
| const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); |
| int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd); |
| snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream); |
| snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream); |
| |
| int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, |
| dma_filter_fn filter_fn, void *filter_data); |
| 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 |