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152 lines
5.7 KiB
152 lines
5.7 KiB
/* |
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* Copyright (C) 2012, Analog Devices Inc. |
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* Author: Lars-Peter Clausen <lars@metafoo.de> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the |
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* Free Software Foundation; either version 2 of the License, or (at your |
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* option) any later version. |
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* |
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* You should have received a copy of the GNU General Public License along |
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* with this program; if not, write to the Free Software Foundation, Inc., |
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* 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*/ |
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#ifndef __SOUND_DMAENGINE_PCM_H__ |
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#define __SOUND_DMAENGINE_PCM_H__ |
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#include <sound/pcm.h> |
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#include <sound/soc.h> |
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#include <linux/dmaengine.h> |
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/** |
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* snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM |
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* substream |
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* @substream: PCM substream |
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*/ |
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static inline enum dma_transfer_direction |
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snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream) |
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{ |
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
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return DMA_MEM_TO_DEV; |
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else |
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return DMA_DEV_TO_MEM; |
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} |
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int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, |
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const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); |
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int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd); |
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snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream); |
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snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream); |
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int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, |
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struct dma_chan *chan); |
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int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); |
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int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, |
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dma_filter_fn filter_fn, void *filter_data); |
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int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream); |
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struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, |
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void *filter_data); |
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struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream); |
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/** |
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* struct snd_dmaengine_dai_dma_data - DAI DMA configuration data |
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* @addr: Address of the DAI data source or destination register. |
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* @addr_width: Width of the DAI data source or destination register. |
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* @maxburst: Maximum number of words(note: words, as in units of the |
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* src_addr_width member, not bytes) that can be send to or received from the |
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* DAI in one burst. |
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* @slave_id: Slave requester id for the DMA channel. |
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* @filter_data: Custom DMA channel filter data, this will usually be used when |
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* requesting the DMA channel. |
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* @chan_name: Custom channel name to use when requesting DMA channel. |
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* @fifo_size: FIFO size of the DAI controller in bytes |
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*/ |
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struct snd_dmaengine_dai_dma_data { |
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dma_addr_t addr; |
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enum dma_slave_buswidth addr_width; |
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u32 maxburst; |
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unsigned int slave_id; |
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void *filter_data; |
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const char *chan_name; |
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unsigned int fifo_size; |
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}; |
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void snd_dmaengine_pcm_set_config_from_dai_data( |
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const struct snd_pcm_substream *substream, |
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const struct snd_dmaengine_dai_dma_data *dma_data, |
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struct dma_slave_config *config); |
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/* |
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* Try to request the DMA channel using compat_request_channel or |
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* compat_filter_fn if it couldn't be requested through devicetree. |
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*/ |
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#define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0) |
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/* |
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* Don't try to request the DMA channels through devicetree. This flag only |
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* makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well. |
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*/ |
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#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1) |
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/* |
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* The PCM is half duplex and the DMA channel is shared between capture and |
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* playback. |
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*/ |
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#define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3) |
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/* |
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* The PCM streams have custom channel names specified. |
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*/ |
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#define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4) |
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/** |
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* struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM |
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* @prepare_slave_config: Callback used to fill in the DMA slave_config for a |
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* PCM substream. Will be called from the PCM drivers hwparams callback. |
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* @compat_request_channel: Callback to request a DMA channel for platforms |
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* which do not use devicetree. |
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* @compat_filter_fn: Will be used as the filter function when requesting a |
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* channel for platforms which do not use devicetree. The filter parameter |
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* will be the DAI's DMA data. |
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* @dma_dev: If set, request DMA channel on this device rather than the DAI |
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* device. |
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* @chan_names: If set, these custom DMA channel names will be requested at |
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* registration time. |
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* @pcm_hardware: snd_pcm_hardware struct to be used for the PCM. |
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* @prealloc_buffer_size: Size of the preallocated audio buffer. |
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* |
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* Note: If both compat_request_channel and compat_filter_fn are set |
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* compat_request_channel will be used to request the channel and |
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* compat_filter_fn will be ignored. Otherwise the channel will be requested |
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* using dma_request_channel with compat_filter_fn as the filter function. |
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*/ |
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struct snd_dmaengine_pcm_config { |
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int (*prepare_slave_config)(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct dma_slave_config *slave_config); |
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struct dma_chan *(*compat_request_channel)( |
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struct snd_soc_pcm_runtime *rtd, |
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struct snd_pcm_substream *substream); |
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dma_filter_fn compat_filter_fn; |
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struct device *dma_dev; |
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const char *chan_names[SNDRV_PCM_STREAM_LAST + 1]; |
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const struct snd_pcm_hardware *pcm_hardware; |
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unsigned int prealloc_buffer_size; |
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}; |
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int snd_dmaengine_pcm_register(struct device *dev, |
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const struct snd_dmaengine_pcm_config *config, |
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unsigned int flags); |
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void snd_dmaengine_pcm_unregister(struct device *dev); |
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int devm_snd_dmaengine_pcm_register(struct device *dev, |
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const struct snd_dmaengine_pcm_config *config, |
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unsigned int flags); |
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int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct dma_slave_config *slave_config); |
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#endif
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