LXR linux/include/sound/dmaengine

   1/*
   2 *  Copyright (C) 2012, Analog Devices Inc.
   3 *      Author: Lars-Peter Clausen <lars@metafoo.de>
   4 *
   5 *  This program is free software; you can redistribute it and/or modify it
   6 *  under  the terms of the GNU General  Public License as published by the
   7 *  Free Software Foundation;  either version 2 of the License, or (at your
   8 *  option) any later version.
   9 *
  10 *  You should have received a copy of the GNU General Public License along
  11 *  with this program; if not, write to the Free Software Foundation, Inc.,
  12 *  675 Mass Ave, Cambridge, MA 02139, USA.
  13 *
  14 */
  15#ifndef __SOUND_DMAENGINE_PCM_H__
  16#define __SOUND_DMAENGINE_PCM_H__
  17
  18#include <sound/pcm.h>
  19#include <sound/soc.h>
  20#include <linux/dmaengine.h>
  21
  22/**
  23 * snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM
  24 *   substream
  25 * @substream: PCM substream
  26 */
  27static inline enum dma_transfer_direction
  28snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream)
  29{
  30        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  31                return DMA_MEM_TO_DEV;
  32        else
  33                return DMA_DEV_TO_MEM;
  34}
  35
  36int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
  37        const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config);
  38int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
  39snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
  40snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
  41
  42int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
  43        struct dma_chan *chan);
  44int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
  45
  46int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
  47        dma_filter_fn filter_fn, void *filter_data);
  48int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
  49
  50struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
  51        void *filter_data);
  52struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
  53
  54/**
  55 * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data
  56 * @addr: Address of the DAI data source or destination register.
  57 * @addr_width: Width of the DAI data source or destination register.
  58 * @maxburst: Maximum number of words(note: words, as in units of the
  59 * src_addr_width member, not bytes) that can be send to or received from the
  60 * DAI in one burst.
  61 * @slave_id: Slave requester id for the DMA channel.
  62 * @filter_data: Custom DMA channel filter data, this will usually be used when
  63 * requesting the DMA channel.
  64 * @chan_name: Custom channel name to use when requesting DMA channel.
  65 * @fifo_size: FIFO size of the DAI controller in bytes
  66 */
  67struct snd_dmaengine_dai_dma_data {
  68        dma_addr_t addr;
  69        enum dma_slave_buswidth addr_width;
  70        u32 maxburst;
  71        unsigned int slave_id;
  72        void *filter_data;
  73        const char *chan_name;
  74        unsigned int fifo_size;
  75};
  76
  77void snd_dmaengine_pcm_set_config_from_dai_data(
  78        const struct snd_pcm_substream *substream,
  79        const struct snd_dmaengine_dai_dma_data *dma_data,
  80        struct dma_slave_config *config);
  81
  82
  83/*
  84 * Try to request the DMA channel using compat_request_channel or
  85 * compat_filter_fn if it couldn't be requested through devicetree.
  86 */
  87#define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0)
  88/*
  89 * Don't try to request the DMA channels through devicetree. This flag only
  90 * makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well.
  91 */
  92#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
  93/*
  94 * The PCM is half duplex and the DMA channel is shared between capture and
  95 * playback.
  96 */
  97#define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
  98/*
  99 * The PCM streams have custom channel names specified.
 100 */
 101#define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4)
 102
 103/**
 104 * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
 105 * @prepare_slave_config: Callback used to fill in the DMA slave_config for a
 106 *   PCM substream. Will be called from the PCM drivers hwparams callback.
 107 * @compat_request_channel: Callback to request a DMA channel for platforms
 108 *   which do not use devicetree.
 109 * @compat_filter_fn: Will be used as the filter function when requesting a
 110 *  channel for platforms which do not use devicetree. The filter parameter
 111 *  will be the DAI's DMA data.
 112 * @dma_dev: If set, request DMA channel on this device rather than the DAI
 113 *  device.
 114 * @chan_names: If set, these custom DMA channel names will be requested at
 115 *  registration time.
 116 * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
 117 * @prealloc_buffer_size: Size of the preallocated audio buffer.
 118 *
 119 * Note: If both compat_request_channel and compat_filter_fn are set
 120 * compat_request_channel will be used to request the channel and
 121 * compat_filter_fn will be ignored. Otherwise the channel will be requested
 122 * using dma_request_channel with compat_filter_fn as the filter function.
 123 */
 124struct snd_dmaengine_pcm_config {
 125        int (*prepare_slave_config)(struct snd_pcm_substream *substream,
 126                        struct snd_pcm_hw_params *params,
 127                        struct dma_slave_config *slave_config);
 128        struct dma_chan *(*compat_request_channel)(
 129                        struct snd_soc_pcm_runtime *rtd,
 130                        struct snd_pcm_substream *substream);
 131        dma_filter_fn compat_filter_fn;
 132        struct device *dma_dev;
 133        const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];
 134
 135        const struct snd_pcm_hardware *pcm_hardware;
 136        unsigned int prealloc_buffer_size;
 137};
 138
 139int snd_dmaengine_pcm_register(struct device *dev,
 140        const struct snd_dmaengine_pcm_config *config,
 141        unsigned int flags);
 142void snd_dmaengine_pcm_unregister(struct device *dev);
 143
 144int devm_snd_dmaengine_pcm_register(struct device *dev,
 145        const struct snd_dmaengine_pcm_config *config,
 146        unsigned int flags);
 147
 148int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
 149        struct snd_pcm_hw_params *params,
 150        struct dma_slave_config *slave_config);
 151
 152#endif
 153