172 lines
6.5 KiB
C
172 lines
6.5 KiB
C
/*
|
|
* 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 <sound/soc.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,
|
|
struct dma_chan *chan);
|
|
int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
|
|
|
|
int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
|
|
dma_filter_fn filter_fn, void *filter_data);
|
|
int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
|
|
|
|
struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
|
|
void *filter_data);
|
|
struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
|
|
|
|
/*
|
|
* The DAI supports packed transfers, eg 2 16-bit samples in a 32-bit word.
|
|
* If this flag is set the dmaengine driver won't put any restriction on
|
|
* the supported sample formats and set the DMA transfer size to undefined.
|
|
* The DAI driver is responsible to disable any unsupported formats in it's
|
|
* configuration and catch corner cases that are not already handled in
|
|
* the ALSA core.
|
|
*/
|
|
#define SND_DMAENGINE_PCM_DAI_FLAG_PACK BIT(0)
|
|
|
|
/**
|
|
* 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.
|
|
* @chan_name: Custom channel name to use when requesting DMA channel.
|
|
* @fifo_size: FIFO size of the DAI controller in bytes
|
|
* @flags: PCM_DAI flags, only SND_DMAENGINE_PCM_DAI_FLAG_PACK for now
|
|
*/
|
|
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;
|
|
const char *chan_name;
|
|
unsigned int fifo_size;
|
|
unsigned int flags;
|
|
};
|
|
|
|
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);
|
|
|
|
|
|
/*
|
|
* Try to request the DMA channel using compat_request_channel or
|
|
* compat_filter_fn if it couldn't be requested through devicetree.
|
|
*/
|
|
#define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0)
|
|
/*
|
|
* Don't try to request the DMA channels through devicetree. This flag only
|
|
* makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well.
|
|
*/
|
|
#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
|
|
/*
|
|
* The PCM is half duplex and the DMA channel is shared between capture and
|
|
* playback.
|
|
*/
|
|
#define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
|
|
/*
|
|
* The PCM streams have custom channel names specified.
|
|
*/
|
|
#define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4)
|
|
|
|
/**
|
|
* struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
|
|
* @prepare_slave_config: Callback used to fill in the DMA slave_config for a
|
|
* PCM substream. Will be called from the PCM drivers hwparams callback.
|
|
* @compat_request_channel: Callback to request a DMA channel for platforms
|
|
* which do not use devicetree.
|
|
* @process: Callback used to apply processing on samples transferred from/to
|
|
* user space.
|
|
* @compat_filter_fn: Will be used as the filter function when requesting a
|
|
* channel for platforms which do not use devicetree. The filter parameter
|
|
* will be the DAI's DMA data.
|
|
* @dma_dev: If set, request DMA channel on this device rather than the DAI
|
|
* device.
|
|
* @chan_names: If set, these custom DMA channel names will be requested at
|
|
* registration time.
|
|
* @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
|
|
* @prealloc_buffer_size: Size of the preallocated audio buffer.
|
|
*
|
|
* Note: If both compat_request_channel and compat_filter_fn are set
|
|
* compat_request_channel will be used to request the channel and
|
|
* compat_filter_fn will be ignored. Otherwise the channel will be requested
|
|
* using dma_request_channel with compat_filter_fn as the filter function.
|
|
*/
|
|
struct snd_dmaengine_pcm_config {
|
|
int (*prepare_slave_config)(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params,
|
|
struct dma_slave_config *slave_config);
|
|
struct dma_chan *(*compat_request_channel)(
|
|
struct snd_soc_pcm_runtime *rtd,
|
|
struct snd_pcm_substream *substream);
|
|
int (*process)(struct snd_pcm_substream *substream,
|
|
int channel, unsigned long hwoff,
|
|
void *buf, unsigned long bytes);
|
|
dma_filter_fn compat_filter_fn;
|
|
struct device *dma_dev;
|
|
const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];
|
|
|
|
const struct snd_pcm_hardware *pcm_hardware;
|
|
unsigned int prealloc_buffer_size;
|
|
};
|
|
|
|
int snd_dmaengine_pcm_register(struct device *dev,
|
|
const struct snd_dmaengine_pcm_config *config,
|
|
unsigned int flags);
|
|
void snd_dmaengine_pcm_unregister(struct device *dev);
|
|
|
|
int devm_snd_dmaengine_pcm_register(struct device *dev,
|
|
const struct snd_dmaengine_pcm_config *config,
|
|
unsigned int flags);
|
|
|
|
int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params,
|
|
struct dma_slave_config *slave_config);
|
|
|
|
#define SND_DMAENGINE_PCM_DRV_NAME "snd_dmaengine_pcm"
|
|
|
|
#endif
|