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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> | |
c999836d | 19 | #include <sound/soc.h> |
e7f73a16 LPC |
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 | ||
e7f73a16 LPC |
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); | |
3528f27a | 39 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream); |
9883ab22 | 40 | snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream); |
e7f73a16 LPC |
41 | |
42 | int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, | |
7c1c1d4a | 43 | struct dma_chan *chan); |
e7f73a16 LPC |
44 | int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); |
45 | ||
7c1c1d4a LPC |
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 | ||
c999836d LPC |
50 | struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, |
51 | void *filter_data); | |
e7f73a16 LPC |
52 | struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream); |
53 | ||
73fe01cf MR |
54 | /* |
55 | * The DAI supports packed transfers, eg 2 16-bit samples in a 32-bit word. | |
56 | * If this flag is set the dmaengine driver won't put any restriction on | |
57 | * the supported sample formats and set the DMA transfer size to undefined. | |
58 | * The DAI driver is responsible to disable any unsupported formats in it's | |
59 | * configuration and catch corner cases that are not already handled in | |
60 | * the ALSA core. | |
61 | */ | |
62 | #define SND_DMAENGINE_PCM_DAI_FLAG_PACK BIT(0) | |
63 | ||
85c9f9c5 LPC |
64 | /** |
65 | * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data | |
66 | * @addr: Address of the DAI data source or destination register. | |
67 | * @addr_width: Width of the DAI data source or destination register. | |
68 | * @maxburst: Maximum number of words(note: words, as in units of the | |
69 | * src_addr_width member, not bytes) that can be send to or received from the | |
70 | * DAI in one burst. | |
71 | * @slave_id: Slave requester id for the DMA channel. | |
72 | * @filter_data: Custom DMA channel filter data, this will usually be used when | |
73 | * requesting the DMA channel. | |
9bfa24e9 | 74 | * @chan_name: Custom channel name to use when requesting DMA channel. |
c0de42bf | 75 | * @fifo_size: FIFO size of the DAI controller in bytes |
73fe01cf | 76 | * @flags: PCM_DAI flags, only SND_DMAENGINE_PCM_DAI_FLAG_PACK for now |
85c9f9c5 LPC |
77 | */ |
78 | struct snd_dmaengine_dai_dma_data { | |
79 | dma_addr_t addr; | |
80 | enum dma_slave_buswidth addr_width; | |
81 | u32 maxburst; | |
82 | unsigned int slave_id; | |
83 | void *filter_data; | |
9bfa24e9 | 84 | const char *chan_name; |
c0de42bf | 85 | unsigned int fifo_size; |
73fe01cf | 86 | unsigned int flags; |
85c9f9c5 LPC |
87 | }; |
88 | ||
89 | void snd_dmaengine_pcm_set_config_from_dai_data( | |
90 | const struct snd_pcm_substream *substream, | |
91 | const struct snd_dmaengine_dai_dma_data *dma_data, | |
92 | struct dma_slave_config *config); | |
93 | ||
c999836d LPC |
94 | |
95 | /* | |
96 | * Try to request the DMA channel using compat_request_channel or | |
97 | * compat_filter_fn if it couldn't be requested through devicetree. | |
98 | */ | |
99 | #define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0) | |
100 | /* | |
101 | * Don't try to request the DMA channels through devicetree. This flag only | |
102 | * makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well. | |
103 | */ | |
104 | #define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1) | |
d1e1406c LPC |
105 | /* |
106 | * The PCM is half duplex and the DMA channel is shared between capture and | |
107 | * playback. | |
108 | */ | |
109 | #define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3) | |
9bfa24e9 SN |
110 | /* |
111 | * The PCM streams have custom channel names specified. | |
112 | */ | |
113 | #define SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME BIT(4) | |
c999836d | 114 | |
28c4468b LPC |
115 | /** |
116 | * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM | |
117 | * @prepare_slave_config: Callback used to fill in the DMA slave_config for a | |
118 | * PCM substream. Will be called from the PCM drivers hwparams callback. | |
c999836d LPC |
119 | * @compat_request_channel: Callback to request a DMA channel for platforms |
120 | * which do not use devicetree. | |
2e78a556 OM |
121 | * @process: Callback used to apply processing on samples transferred from/to |
122 | * user space. | |
c999836d LPC |
123 | * @compat_filter_fn: Will be used as the filter function when requesting a |
124 | * channel for platforms which do not use devicetree. The filter parameter | |
125 | * will be the DAI's DMA data. | |
194c7dea SW |
126 | * @dma_dev: If set, request DMA channel on this device rather than the DAI |
127 | * device. | |
128 | * @chan_names: If set, these custom DMA channel names will be requested at | |
129 | * registration time. | |
28c4468b LPC |
130 | * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM. |
131 | * @prealloc_buffer_size: Size of the preallocated audio buffer. | |
c999836d LPC |
132 | * |
133 | * Note: If both compat_request_channel and compat_filter_fn are set | |
134 | * compat_request_channel will be used to request the channel and | |
135 | * compat_filter_fn will be ignored. Otherwise the channel will be requested | |
136 | * using dma_request_channel with compat_filter_fn as the filter function. | |
28c4468b LPC |
137 | */ |
138 | struct snd_dmaengine_pcm_config { | |
139 | int (*prepare_slave_config)(struct snd_pcm_substream *substream, | |
140 | struct snd_pcm_hw_params *params, | |
141 | struct dma_slave_config *slave_config); | |
c999836d LPC |
142 | struct dma_chan *(*compat_request_channel)( |
143 | struct snd_soc_pcm_runtime *rtd, | |
144 | struct snd_pcm_substream *substream); | |
78648092 OM |
145 | int (*process)(struct snd_pcm_substream *substream, |
146 | int channel, unsigned long hwoff, | |
147 | void *buf, unsigned long bytes); | |
c999836d | 148 | dma_filter_fn compat_filter_fn; |
194c7dea SW |
149 | struct device *dma_dev; |
150 | const char *chan_names[SNDRV_PCM_STREAM_LAST + 1]; | |
28c4468b LPC |
151 | |
152 | const struct snd_pcm_hardware *pcm_hardware; | |
153 | unsigned int prealloc_buffer_size; | |
154 | }; | |
155 | ||
156 | int snd_dmaengine_pcm_register(struct device *dev, | |
157 | const struct snd_dmaengine_pcm_config *config, | |
158 | unsigned int flags); | |
159 | void snd_dmaengine_pcm_unregister(struct device *dev); | |
160 | ||
21585ee8 LPC |
161 | int devm_snd_dmaengine_pcm_register(struct device *dev, |
162 | const struct snd_dmaengine_pcm_config *config, | |
163 | unsigned int flags); | |
164 | ||
28c4468b LPC |
165 | int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, |
166 | struct snd_pcm_hw_params *params, | |
167 | struct dma_slave_config *slave_config); | |
168 | ||
be7ee5f3 KM |
169 | #define SND_DMAENGINE_PCM_DRV_NAME "snd_dmaengine_pcm" |
170 | ||
e7f73a16 | 171 | #endif |