28c4468b00
This patch adds a generic dmaengine PCM driver. It builds on top of the dmaengine PCM library and adds the missing pieces like DMA channel management, buffer management and channel configuration. It will be able to replace the majority of the existing platform specific dmaengine based PCM drivers. Devicetree is used to map the DMA channels to the PCM device. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Tested-by: Stephen Warren <swarren@nvidia.com> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*
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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 <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_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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*/
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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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};
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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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* 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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* @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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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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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 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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