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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 | */ |
65 | struct snd_dmaengine_dai_dma_data { |
66 | dma_addr_t addr; |
67 | enum dma_slave_buswidth addr_width; |
68 | u32 maxburst; |
69 | unsigned int slave_id; |
70 | void *filter_data; |
71 | }; |
72 | |
73 | void snd_dmaengine_pcm_set_config_from_dai_data( |
74 | const struct snd_pcm_substream *substream, |
75 | const struct snd_dmaengine_dai_dma_data *dma_data, |
76 | struct dma_slave_config *config); |
77 | |
78 | |
79 | /* |
80 | * Try to request the DMA channel using compat_request_channel or |
81 | * compat_filter_fn if it couldn't be requested through devicetree. |
82 | */ |
83 | #define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0) |
84 | /* |
85 | * Don't try to request the DMA channels through devicetree. This flag only |
86 | * makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well. |
87 | */ |
88 | #define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1) |
89 | /* |
90 | * The platforms dmaengine driver does not support reporting the amount of |
91 | * bytes that are still left to transfer. |
92 | */ |
93 | #define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(2) |
94 | /* |
95 | * The PCM is half duplex and the DMA channel is shared between capture and |
96 | * playback. |
97 | */ |
98 | #define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3) |
99 | |
100 | /** |
101 | * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM |
102 | * @prepare_slave_config: Callback used to fill in the DMA slave_config for a |
103 | * PCM substream. Will be called from the PCM drivers hwparams callback. |
104 | * @compat_request_channel: Callback to request a DMA channel for platforms |
105 | * which do not use devicetree. |
106 | * @compat_filter_fn: Will be used as the filter function when requesting a |
107 | * channel for platforms which do not use devicetree. The filter parameter |
108 | * will be the DAI's DMA data. |
109 | * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM. |
110 | * @prealloc_buffer_size: Size of the preallocated audio buffer. |
111 | * |
112 | * Note: If both compat_request_channel and compat_filter_fn are set |
113 | * compat_request_channel will be used to request the channel and |
114 | * compat_filter_fn will be ignored. Otherwise the channel will be requested |
115 | * using dma_request_channel with compat_filter_fn as the filter function. |
116 | */ |
117 | struct snd_dmaengine_pcm_config { |
118 | int (*prepare_slave_config)(struct snd_pcm_substream *substream, |
119 | struct snd_pcm_hw_params *params, |
120 | struct dma_slave_config *slave_config); |
121 | struct dma_chan *(*compat_request_channel)( |
122 | struct snd_soc_pcm_runtime *rtd, |
123 | struct snd_pcm_substream *substream); |
124 | dma_filter_fn compat_filter_fn; |
125 | |
126 | const struct snd_pcm_hardware *pcm_hardware; |
127 | unsigned int prealloc_buffer_size; |
128 | }; |
129 | |
130 | int snd_dmaengine_pcm_register(struct device *dev, |
131 | const struct snd_dmaengine_pcm_config *config, |
132 | unsigned int flags); |
133 | void snd_dmaengine_pcm_unregister(struct device *dev); |
134 | |
135 | int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, |
136 | struct snd_pcm_hw_params *params, |
137 | struct dma_slave_config *slave_config); |
138 | |
139 | #endif |
140 |
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