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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 */
27static inline enum dma_transfer_direction
28snd_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
36int 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);
38int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
39snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
40snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
41
42int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
43 struct dma_chan *chan);
44int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
45
46int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
47 dma_filter_fn filter_fn, void *filter_data);
48int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
49
50struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
51 void *filter_data);
52struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
53
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
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.
74 * @fifo_size: FIFO size of the DAI controller in bytes
75 * @flags: PCM_DAI flags, only SND_DMAENGINE_PCM_DAI_FLAG_PACK for now
76 */
77struct snd_dmaengine_dai_dma_data {
78 dma_addr_t addr;
79 enum dma_slave_buswidth addr_width;
80 u32 maxburst;
81 unsigned int slave_id;
82 void *filter_data;
83 unsigned int fifo_size;
84 unsigned int flags;
85};
86
87void snd_dmaengine_pcm_set_config_from_dai_data(
88 const struct snd_pcm_substream *substream,
89 const struct snd_dmaengine_dai_dma_data *dma_data,
90 struct dma_slave_config *config);
91
92
93/*
94 * Try to request the DMA channel using compat_request_channel or
95 * compat_filter_fn if it couldn't be requested through devicetree.
96 */
97#define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0)
98/*
99 * Don't try to request the DMA channels through devicetree. This flag only
100 * makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well.
101 */
102#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
103/*
104 * The PCM is half duplex and the DMA channel is shared between capture and
105 * playback.
106 */
107#define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
108
109/**
110 * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
111 * @prepare_slave_config: Callback used to fill in the DMA slave_config for a
112 * PCM substream. Will be called from the PCM drivers hwparams callback.
113 * @compat_request_channel: Callback to request a DMA channel for platforms
114 * which do not use devicetree.
115 * @compat_filter_fn: Will be used as the filter function when requesting a
116 * channel for platforms which do not use devicetree. The filter parameter
117 * will be the DAI's DMA data.
118 * @dma_dev: If set, request DMA channel on this device rather than the DAI
119 * device.
120 * @chan_names: If set, these custom DMA channel names will be requested at
121 * registration time.
122 * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
123 * @prealloc_buffer_size: Size of the preallocated audio buffer.
124 *
125 * Note: If both compat_request_channel and compat_filter_fn are set
126 * compat_request_channel will be used to request the channel and
127 * compat_filter_fn will be ignored. Otherwise the channel will be requested
128 * using dma_request_channel with compat_filter_fn as the filter function.
129 */
130struct snd_dmaengine_pcm_config {
131 int (*prepare_slave_config)(struct snd_pcm_substream *substream,
132 struct snd_pcm_hw_params *params,
133 struct dma_slave_config *slave_config);
134 struct dma_chan *(*compat_request_channel)(
135 struct snd_soc_pcm_runtime *rtd,
136 struct snd_pcm_substream *substream);
137 dma_filter_fn compat_filter_fn;
138 struct device *dma_dev;
139 const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];
140
141 const struct snd_pcm_hardware *pcm_hardware;
142 unsigned int prealloc_buffer_size;
143};
144
145int snd_dmaengine_pcm_register(struct device *dev,
146 const struct snd_dmaengine_pcm_config *config,
147 unsigned int flags);
148void snd_dmaengine_pcm_unregister(struct device *dev);
149
150int devm_snd_dmaengine_pcm_register(struct device *dev,
151 const struct snd_dmaengine_pcm_config *config,
152 unsigned int flags);
153
154int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
155 struct snd_pcm_hw_params *params,
156 struct dma_slave_config *slave_config);
157
158#endif
1/* SPDX-License-Identifier: GPL-2.0+
2 *
3 * Copyright (C) 2012, Analog Devices Inc.
4 * Author: Lars-Peter Clausen <lars@metafoo.de>
5 */
6
7#ifndef __SOUND_DMAENGINE_PCM_H__
8#define __SOUND_DMAENGINE_PCM_H__
9
10#include <sound/pcm.h>
11#include <sound/soc.h>
12#include <linux/dmaengine.h>
13
14/**
15 * snd_pcm_substream_to_dma_direction - Get dma_transfer_direction for a PCM
16 * substream
17 * @substream: PCM substream
18 *
19 * Return: DMA transfer direction
20 */
21static inline enum dma_transfer_direction
22snd_pcm_substream_to_dma_direction(const struct snd_pcm_substream *substream)
23{
24 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
25 return DMA_MEM_TO_DEV;
26 else
27 return DMA_DEV_TO_MEM;
28}
29
30int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
31 const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config);
32int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd);
33snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream);
34snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream);
35
36int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
37 struct dma_chan *chan);
38int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream);
39
40int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
41 dma_filter_fn filter_fn, void *filter_data);
42int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream);
43
44struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
45 void *filter_data);
46struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream);
47
48/*
49 * The DAI supports packed transfers, eg 2 16-bit samples in a 32-bit word.
50 * If this flag is set the dmaengine driver won't put any restriction on
51 * the supported sample formats and set the DMA transfer size to undefined.
52 * The DAI driver is responsible to disable any unsupported formats in it's
53 * configuration and catch corner cases that are not already handled in
54 * the ALSA core.
55 */
56#define SND_DMAENGINE_PCM_DAI_FLAG_PACK BIT(0)
57
58/**
59 * struct snd_dmaengine_dai_dma_data - DAI DMA configuration data
60 * @addr: Address of the DAI data source or destination register.
61 * @addr_width: Width of the DAI data source or destination register.
62 * @maxburst: Maximum number of words(note: words, as in units of the
63 * src_addr_width member, not bytes) that can be send to or received from the
64 * DAI in one burst.
65 * @filter_data: Custom DMA channel filter data, this will usually be used when
66 * requesting the DMA channel.
67 * @chan_name: Custom channel name to use when requesting DMA channel.
68 * @fifo_size: FIFO size of the DAI controller in bytes
69 * @flags: PCM_DAI flags, only SND_DMAENGINE_PCM_DAI_FLAG_PACK for now
70 * @peripheral_config: peripheral configuration for programming peripheral
71 * for dmaengine transfer
72 * @peripheral_size: peripheral configuration buffer size
73 */
74struct snd_dmaengine_dai_dma_data {
75 dma_addr_t addr;
76 enum dma_slave_buswidth addr_width;
77 u32 maxburst;
78 void *filter_data;
79 const char *chan_name;
80 unsigned int fifo_size;
81 unsigned int flags;
82 void *peripheral_config;
83 size_t peripheral_size;
84};
85
86void snd_dmaengine_pcm_set_config_from_dai_data(
87 const struct snd_pcm_substream *substream,
88 const struct snd_dmaengine_dai_dma_data *dma_data,
89 struct dma_slave_config *config);
90
91int snd_dmaengine_pcm_refine_runtime_hwparams(
92 struct snd_pcm_substream *substream,
93 struct snd_dmaengine_dai_dma_data *dma_data,
94 struct snd_pcm_hardware *hw,
95 struct dma_chan *chan);
96
97/*
98 * Try to request the DMA channel using compat_request_channel or
99 * compat_filter_fn if it couldn't be requested through devicetree.
100 */
101#define SND_DMAENGINE_PCM_FLAG_COMPAT BIT(0)
102/*
103 * Don't try to request the DMA channels through devicetree. This flag only
104 * makes sense if SND_DMAENGINE_PCM_FLAG_COMPAT is set as well.
105 */
106#define SND_DMAENGINE_PCM_FLAG_NO_DT BIT(1)
107/*
108 * The PCM is half duplex and the DMA channel is shared between capture and
109 * playback.
110 */
111#define SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX BIT(3)
112
113/**
114 * struct snd_dmaengine_pcm_config - Configuration data for dmaengine based PCM
115 * @prepare_slave_config: Callback used to fill in the DMA slave_config for a
116 * PCM substream. Will be called from the PCM drivers hwparams callback.
117 * @compat_request_channel: Callback to request a DMA channel for platforms
118 * which do not use devicetree.
119 * @process: Callback used to apply processing on samples transferred from/to
120 * user space.
121 * @compat_filter_fn: Will be used as the filter function when requesting a
122 * channel for platforms which do not use devicetree. The filter parameter
123 * will be the DAI's DMA data.
124 * @dma_dev: If set, request DMA channel on this device rather than the DAI
125 * device.
126 * @chan_names: If set, these custom DMA channel names will be requested at
127 * registration time.
128 * @pcm_hardware: snd_pcm_hardware struct to be used for the PCM.
129 * @prealloc_buffer_size: Size of the preallocated audio buffer.
130 *
131 * Note: If both compat_request_channel and compat_filter_fn are set
132 * compat_request_channel will be used to request the channel and
133 * compat_filter_fn will be ignored. Otherwise the channel will be requested
134 * using dma_request_channel with compat_filter_fn as the filter function.
135 */
136struct snd_dmaengine_pcm_config {
137 int (*prepare_slave_config)(struct snd_pcm_substream *substream,
138 struct snd_pcm_hw_params *params,
139 struct dma_slave_config *slave_config);
140 struct dma_chan *(*compat_request_channel)(
141 struct snd_soc_pcm_runtime *rtd,
142 struct snd_pcm_substream *substream);
143 int (*process)(struct snd_pcm_substream *substream,
144 int channel, unsigned long hwoff,
145 unsigned long bytes);
146 dma_filter_fn compat_filter_fn;
147 struct device *dma_dev;
148 const char *chan_names[SNDRV_PCM_STREAM_LAST + 1];
149
150 const struct snd_pcm_hardware *pcm_hardware;
151 unsigned int prealloc_buffer_size;
152};
153
154int snd_dmaengine_pcm_register(struct device *dev,
155 const struct snd_dmaengine_pcm_config *config,
156 unsigned int flags);
157void snd_dmaengine_pcm_unregister(struct device *dev);
158
159int devm_snd_dmaengine_pcm_register(struct device *dev,
160 const struct snd_dmaengine_pcm_config *config,
161 unsigned int flags);
162
163int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
164 struct snd_pcm_hw_params *params,
165 struct dma_slave_config *slave_config);
166
167#define SND_DMAENGINE_PCM_DRV_NAME "snd_dmaengine_pcm"
168
169struct dmaengine_pcm {
170 struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
171 const struct snd_dmaengine_pcm_config *config;
172 struct snd_soc_component component;
173 unsigned int flags;
174};
175
176static inline struct dmaengine_pcm *soc_component_to_pcm(struct snd_soc_component *p)
177{
178 return container_of(p, struct dmaengine_pcm, component);
179}
180#endif