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7c1c1d4a7b
Refactor the dmaengine PCM library to allow the DMA channel to be requested
before opening a PCM substream. snd_dmaengine_pcm_open() now expects a DMA
channel instead of a filter function and filter parameter as its parameters.
snd_dmaengine_pcm_close() is updated to not release the DMA channel. This allows
a dmaengine based PCM driver to request its channels before the substream is
opened.
The patch also introduces two new functions, snd_dmaengine_pcm_open_request_chan()
and snd_dmaengine_pcm_close_release_chan(), which have the same signature and
behaviour of the old snd_dmaengine_pcm_{open,close}() and internally use the new
variants of these functions. All users of snd_dmaengine_pcm_{open,close}() are
updated to use snd_dmaengine_pcm_open_request_chan() and
snd_dmaengine_pcm_close_release_chan().
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>
76 lines
2.7 KiB
C
76 lines
2.7 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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#endif
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