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e7f73a16 LPC |
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 <linux/dmaengine.h> | |
20 | ||
21 | /** | |
22 | * snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM | |
23 | * substream | |
24 | * @substream: PCM substream | |
25 | */ | |
26 | static inline enum dma_transfer_direction | |
27 | snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream) | |
28 | { | |
29 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) | |
30 | return DMA_MEM_TO_DEV; | |
31 | else | |
32 | return DMA_DEV_TO_MEM; | |
33 | } | |
34 | ||
e7f73a16 LPC |
35 | int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, |
36 | const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); | |
37 | int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd); | |
3528f27a | 38 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream); |
9883ab22 | 39 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream); |
e7f73a16 LPC |
40 | |
41 | int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, | |
42 | dma_filter_fn filter_fn, void *filter_data); | |
43 | int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); | |
44 | ||
45 | struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream); | |
46 | ||
85c9f9c5 LPC |
47 | /** |
48 | * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data | |
49 | * @addr: Address of the DAI data source or destination register. | |
50 | * @addr_width: Width of the DAI data source or destination register. | |
51 | * @maxburst: Maximum number of words(note: words, as in units of the | |
52 | * src_addr_width member, not bytes) that can be send to or received from the | |
53 | * DAI in one burst. | |
54 | * @slave_id: Slave requester id for the DMA channel. | |
55 | * @filter_data: Custom DMA channel filter data, this will usually be used when | |
56 | * requesting the DMA channel. | |
57 | */ | |
58 | struct snd_dmaengine_dai_dma_data { | |
59 | dma_addr_t addr; | |
60 | enum dma_slave_buswidth addr_width; | |
61 | u32 maxburst; | |
62 | unsigned int slave_id; | |
63 | void *filter_data; | |
64 | }; | |
65 | ||
66 | void snd_dmaengine_pcm_set_config_from_dai_data( | |
67 | const struct snd_pcm_substream *substream, | |
68 | const struct snd_dmaengine_dai_dma_data *dma_data, | |
69 | struct dma_slave_config *config); | |
70 | ||
e7f73a16 | 71 | #endif |