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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, | |
7c1c1d4a | 42 | struct dma_chan *chan); |
e7f73a16 LPC |
43 | int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); |
44 | ||
7c1c1d4a LPC |
45 | int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream, |
46 | dma_filter_fn filter_fn, void *filter_data); | |
47 | int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream); | |
48 | ||
e7f73a16 LPC |
49 | struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream); |
50 | ||
85c9f9c5 LPC |
51 | /** |
52 | * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data | |
53 | * @addr: Address of the DAI data source or destination register. | |
54 | * @addr_width: Width of the DAI data source or destination register. | |
55 | * @maxburst: Maximum number of words(note: words, as in units of the | |
56 | * src_addr_width member, not bytes) that can be send to or received from the | |
57 | * DAI in one burst. | |
58 | * @slave_id: Slave requester id for the DMA channel. | |
59 | * @filter_data: Custom DMA channel filter data, this will usually be used when | |
60 | * requesting the DMA channel. | |
61 | */ | |
62 | struct snd_dmaengine_dai_dma_data { | |
63 | dma_addr_t addr; | |
64 | enum dma_slave_buswidth addr_width; | |
65 | u32 maxburst; | |
66 | unsigned int slave_id; | |
67 | void *filter_data; | |
68 | }; | |
69 | ||
70 | void snd_dmaengine_pcm_set_config_from_dai_data( | |
71 | const struct snd_pcm_substream *substream, | |
72 | const struct snd_dmaengine_dai_dma_data *dma_data, | |
73 | struct dma_slave_config *config); | |
74 | ||
28c4468b LPC |
75 | /** |
76 | * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM | |
77 | * @prepare_slave_config: Callback used to fill in the DMA slave_config for a | |
78 | * PCM substream. Will be called from the PCM drivers hwparams callback. | |
79 | * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM. | |
80 | * @prealloc_buffer_size: Size of the preallocated audio buffer. | |
81 | */ | |
82 | struct snd_dmaengine_pcm_config { | |
83 | int (*prepare_slave_config)(struct snd_pcm_substream *substream, | |
84 | struct snd_pcm_hw_params *params, | |
85 | struct dma_slave_config *slave_config); | |
86 | ||
87 | const struct snd_pcm_hardware *pcm_hardware; | |
88 | unsigned int prealloc_buffer_size; | |
89 | }; | |
90 | ||
91 | int snd_dmaengine_pcm_register(struct device *dev, | |
92 | const struct snd_dmaengine_pcm_config *config, | |
93 | unsigned int flags); | |
94 | void snd_dmaengine_pcm_unregister(struct device *dev); | |
95 | ||
96 | int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, | |
97 | struct snd_pcm_hw_params *params, | |
98 | struct dma_slave_config *slave_config); | |
99 | ||
e7f73a16 | 100 | #endif |