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Linux/include/sound/dmaengine_pcm.h

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  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  */
 27 static inline enum dma_transfer_direction
 28 snd_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 
 36 int 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);
 38 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
 39 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
 40 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
 41 
 42 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
 43         struct dma_chan *chan);
 44 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
 45 
 46 int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
 47         dma_filter_fn filter_fn, void *filter_data);
 48 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
 49 
 50 struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
 51         void *filter_data);
 52 struct 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  */
 67 struct 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 
 77 void 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 platforms dmaengine driver does not support reporting the amount of
 95  * bytes that are still left to transfer.
 96  */
 97 #define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2)
 98 /*
 99  * The PCM is half duplex and the DMA channel is shared between capture and
100  * playback.
101  */
102 #define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
103 /*
104  * The PCM streams have custom channel names specified.
105  */
106 #define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4)
107 
108 /**
109  * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
110  * @prepare_slave_config: Callback used to fill in the DMA slave_config for a
111  *   PCM substream. Will be called from the PCM drivers hwparams callback.
112  * @compat_request_channel: Callback to request a DMA channel for platforms
113  *   which do not use devicetree.
114  * @compat_filter_fn: Will be used as the filter function when requesting a
115  *  channel for platforms which do not use devicetree. The filter parameter
116  *  will be the DAI's DMA data.
117  * @dma_dev: If set, request DMA channel on this device rather than the DAI
118  *  device.
119  * @chan_names: If set, these custom DMA channel names will be requested at
120  *  registration time.
121  * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
122  * @prealloc_buffer_size: Size of the preallocated audio buffer.
123  *
124  * Note: If both compat_request_channel and compat_filter_fn are set
125  * compat_request_channel will be used to request the channel and
126  * compat_filter_fn will be ignored. Otherwise the channel will be requested
127  * using dma_request_channel with compat_filter_fn as the filter function.
128  */
129 struct snd_dmaengine_pcm_config {
130         int (*prepare_slave_config)(struct snd_pcm_substream *substream,
131                         struct snd_pcm_hw_params *params,
132                         struct dma_slave_config *slave_config);
133         struct dma_chan *(*compat_request_channel)(
134                         struct snd_soc_pcm_runtime *rtd,
135                         struct snd_pcm_substream *substream);
136         dma_filter_fn compat_filter_fn;
137         struct device *dma_dev;
138         const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];
139 
140         const struct snd_pcm_hardware *pcm_hardware;
141         unsigned int prealloc_buffer_size;
142 };
143 
144 int snd_dmaengine_pcm_register(struct device *dev,
145         const struct snd_dmaengine_pcm_config *config,
146         unsigned int flags);
147 void snd_dmaengine_pcm_unregister(struct device *dev);
148 
149 int devm_snd_dmaengine_pcm_register(struct device *dev,
150         const struct snd_dmaengine_pcm_config *config,
151         unsigned int flags);
152 
153 int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
154         struct snd_pcm_hw_params *params,
155         struct dma_slave_config *slave_config);
156 
157 #endif
158 

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