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Lars-Peter Clausen28c44682013-04-15 19:19:50 +02001/*
2 * Copyright (C) 2013, 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#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/dmaengine.h>
18#include <linux/slab.h>
19#include <sound/pcm.h>
20#include <sound/pcm_params.h>
21#include <sound/soc.h>
22#include <linux/dma-mapping.h>
23#include <linux/of.h>
Lars-Peter Clausen28c44682013-04-15 19:19:50 +020024
25#include <sound/dmaengine_pcm.h>
26
27struct dmaengine_pcm {
Takashi Iwaif82bf8e2013-10-25 18:06:09 +020028 struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
Lars-Peter Clausen28c44682013-04-15 19:19:50 +020029 const struct snd_dmaengine_pcm_config *config;
30 struct snd_soc_platform platform;
Lars-Peter Clausend1e14062013-04-20 19:29:00 +020031 unsigned int flags;
Lars-Peter Clausen28c44682013-04-15 19:19:50 +020032};
33
34static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
35{
36 return container_of(p, struct dmaengine_pcm, platform);
37}
38
Lars-Peter Clausenc0de42b2013-10-08 15:07:59 +020039static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
40 struct snd_pcm_substream *substream)
41{
42 if (!pcm->chan[substream->stream])
43 return NULL;
44
45 return pcm->chan[substream->stream]->device->dev;
46}
47
Lars-Peter Clausen28c44682013-04-15 19:19:50 +020048/**
49 * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
50 * @substream: PCM substream
51 * @params: hw_params
52 * @slave_config: DMA slave config to prepare
53 *
54 * This function can be used as a generic prepare_slave_config callback for
55 * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
56 * DAI DMA data. Internally the function will first call
57 * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
58 * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
59 * remaining fields based on the DAI DMA data.
60 */
61int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
62 struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
63{
64 struct snd_soc_pcm_runtime *rtd = substream->private_data;
65 struct snd_dmaengine_dai_dma_data *dma_data;
66 int ret;
67
68 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
69
70 ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
71 if (ret)
72 return ret;
73
74 snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
75 slave_config);
76
77 return 0;
78}
79EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
80
81static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
82 struct snd_pcm_hw_params *params)
83{
84 struct snd_soc_pcm_runtime *rtd = substream->private_data;
85 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
86 struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
Lars-Peter Clausenfa654e02013-10-08 15:08:00 +020087 int (*prepare_slave_config)(struct snd_pcm_substream *substream,
88 struct snd_pcm_hw_params *params,
89 struct dma_slave_config *slave_config);
Lars-Peter Clausen28c44682013-04-15 19:19:50 +020090 struct dma_slave_config slave_config;
91 int ret;
92
Lee Jonesa894bd72013-11-06 10:16:20 +000093 memset(&slave_config, 0, sizeof(slave_config));
94
Lars-Peter Clausenfa654e02013-10-08 15:08:00 +020095 if (!pcm->config)
96 prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
97 else
98 prepare_slave_config = pcm->config->prepare_slave_config;
99
100 if (prepare_slave_config) {
101 ret = prepare_slave_config(substream, params, &slave_config);
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200102 if (ret)
103 return ret;
104
105 ret = dmaengine_slave_config(chan, &slave_config);
106 if (ret)
107 return ret;
108 }
109
110 return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
111}
112
Lars-Peter Clausenc0de42b2013-10-08 15:07:59 +0200113static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream)
114{
115 struct snd_soc_pcm_runtime *rtd = substream->private_data;
116 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
117 struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
118 struct dma_chan *chan = pcm->chan[substream->stream];
119 struct snd_dmaengine_dai_dma_data *dma_data;
120 struct dma_slave_caps dma_caps;
121 struct snd_pcm_hardware hw;
122 int ret;
123
Lars-Peter Clausenfa654e02013-10-08 15:08:00 +0200124 if (pcm->config && pcm->config->pcm_hardware)
Lars-Peter Clausenc0de42b2013-10-08 15:07:59 +0200125 return snd_soc_set_runtime_hwparams(substream,
126 pcm->config->pcm_hardware);
127
128 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
129
130 memset(&hw, 0, sizeof(hw));
131 hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
132 SNDRV_PCM_INFO_INTERLEAVED;
133 hw.periods_min = 2;
134 hw.periods_max = UINT_MAX;
135 hw.period_bytes_min = 256;
136 hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
137 hw.buffer_bytes_max = SIZE_MAX;
138 hw.fifo_size = dma_data->fifo_size;
139
140 ret = dma_get_slave_caps(chan, &dma_caps);
141 if (ret == 0) {
142 if (dma_caps.cmd_pause)
143 hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
144 }
145
146 return snd_soc_set_runtime_hwparams(substream, &hw);
147}
148
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200149static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
150{
151 struct snd_soc_pcm_runtime *rtd = substream->private_data;
152 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
153 struct dma_chan *chan = pcm->chan[substream->stream];
154 int ret;
155
Lars-Peter Clausenc0de42b2013-10-08 15:07:59 +0200156 ret = dmaengine_pcm_set_runtime_hwparams(substream);
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200157 if (ret)
158 return ret;
159
160 return snd_dmaengine_pcm_open(substream, chan);
161}
162
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200163static void dmaengine_pcm_free(struct snd_pcm *pcm)
164{
165 snd_pcm_lib_preallocate_free_for_all(pcm);
166}
167
Lars-Peter Clausenc9998362013-04-15 19:19:51 +0200168static struct dma_chan *dmaengine_pcm_compat_request_channel(
169 struct snd_soc_pcm_runtime *rtd,
170 struct snd_pcm_substream *substream)
171{
172 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
Mark Brown90130d22013-10-19 21:38:26 +0100173 struct snd_dmaengine_dai_dma_data *dma_data;
174
175 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
Lars-Peter Clausenc9998362013-04-15 19:19:51 +0200176
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200177 if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
178 return pcm->chan[0];
179
Lars-Peter Clausenc9998362013-04-15 19:19:51 +0200180 if (pcm->config->compat_request_channel)
181 return pcm->config->compat_request_channel(rtd, substream);
182
183 return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
Mark Brown90130d22013-10-19 21:38:26 +0100184 dma_data->filter_data);
Lars-Peter Clausenc9998362013-04-15 19:19:51 +0200185}
186
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200187static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
188{
189 struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
190 const struct snd_dmaengine_pcm_config *config = pcm->config;
Mark Brownea73b7d2013-10-19 17:43:51 +0100191 struct device *dev = rtd->platform->dev;
192 struct snd_dmaengine_dai_dma_data *dma_data;
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200193 struct snd_pcm_substream *substream;
Lars-Peter Clausenfa654e02013-10-08 15:08:00 +0200194 size_t prealloc_buffer_size;
195 size_t max_buffer_size;
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200196 unsigned int i;
197 int ret;
198
Lars-Peter Clausenfa654e02013-10-08 15:08:00 +0200199 if (config && config->prealloc_buffer_size) {
200 prealloc_buffer_size = config->prealloc_buffer_size;
201 max_buffer_size = config->pcm_hardware->buffer_bytes_max;
202 } else {
203 prealloc_buffer_size = 512 * 1024;
204 max_buffer_size = SIZE_MAX;
205 }
206
207
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200208 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
209 substream = rtd->pcm->streams[i].substream;
210 if (!substream)
211 continue;
212
Mark Brownea73b7d2013-10-19 17:43:51 +0100213 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
214
215 if (!pcm->chan[i] &&
216 (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
217 pcm->chan[i] = dma_request_slave_channel(dev,
218 dma_data->chan_name);
219
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200220 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
Lars-Peter Clausenc9998362013-04-15 19:19:51 +0200221 pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
222 substream);
223 }
224
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200225 if (!pcm->chan[i]) {
226 dev_err(rtd->platform->dev,
227 "Missing dma channel for stream: %d\n", i);
228 ret = -EINVAL;
229 goto err_free;
230 }
231
232 ret = snd_pcm_lib_preallocate_pages(substream,
233 SNDRV_DMA_TYPE_DEV,
234 dmaengine_dma_dev(pcm, substream),
Lars-Peter Clausenfa654e02013-10-08 15:08:00 +0200235 prealloc_buffer_size,
236 max_buffer_size);
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200237 if (ret)
238 goto err_free;
239 }
240
241 return 0;
242
243err_free:
244 dmaengine_pcm_free(rtd->pcm);
245 return ret;
246}
247
248static const struct snd_pcm_ops dmaengine_pcm_ops = {
249 .open = dmaengine_pcm_open,
250 .close = snd_dmaengine_pcm_close,
251 .ioctl = snd_pcm_lib_ioctl,
252 .hw_params = dmaengine_pcm_hw_params,
253 .hw_free = snd_pcm_lib_free_pages,
254 .trigger = snd_dmaengine_pcm_trigger,
255 .pointer = snd_dmaengine_pcm_pointer,
256};
257
258static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
259 .ops = &dmaengine_pcm_ops,
260 .pcm_new = dmaengine_pcm_new,
261 .pcm_free = dmaengine_pcm_free,
Lars-Peter Clausenc9998362013-04-15 19:19:51 +0200262 .probe_order = SND_SOC_COMP_ORDER_LATE,
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200263};
264
Lars-Peter Clausen610f7802013-04-15 19:19:55 +0200265static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
266 .open = dmaengine_pcm_open,
267 .close = snd_dmaengine_pcm_close,
268 .ioctl = snd_pcm_lib_ioctl,
269 .hw_params = dmaengine_pcm_hw_params,
270 .hw_free = snd_pcm_lib_free_pages,
271 .trigger = snd_dmaengine_pcm_trigger,
272 .pointer = snd_dmaengine_pcm_pointer_no_residue,
273};
274
275static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
276 .ops = &dmaengine_no_residue_pcm_ops,
277 .pcm_new = dmaengine_pcm_new,
278 .pcm_free = dmaengine_pcm_free,
279 .probe_order = SND_SOC_COMP_ORDER_LATE,
280};
281
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200282static const char * const dmaengine_pcm_dma_channel_names[] = {
283 [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
284 [SNDRV_PCM_STREAM_CAPTURE] = "rx",
285};
286
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200287static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
Shawn Guo6f1fd932013-04-22 21:57:24 +0800288 struct device *dev)
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200289{
290 unsigned int i;
291
Mark Brownea73b7d2013-10-19 17:43:51 +0100292 if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
293 SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
294 !dev->of_node)
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200295 return;
296
297 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
Shawn Guo6f1fd932013-04-22 21:57:24 +0800298 pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200299 pcm->chan[1] = pcm->chan[0];
300 } else {
301 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
Shawn Guo6f1fd932013-04-22 21:57:24 +0800302 pcm->chan[i] = dma_request_slave_channel(dev,
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200303 dmaengine_pcm_dma_channel_names[i]);
304 }
305 }
306}
307
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200308/**
309 * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
310 * @dev: The parent device for the PCM device
311 * @config: Platform specific PCM configuration
312 * @flags: Platform specific quirks
313 */
314int snd_dmaengine_pcm_register(struct device *dev,
315 const struct snd_dmaengine_pcm_config *config, unsigned int flags)
316{
317 struct dmaengine_pcm *pcm;
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200318
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200319 pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
320 if (!pcm)
321 return -ENOMEM;
322
323 pcm->config = config;
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200324 pcm->flags = flags;
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200325
Shawn Guo6f1fd932013-04-22 21:57:24 +0800326 dmaengine_pcm_request_chan_of(pcm, dev);
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200327
Lars-Peter Clausen610f7802013-04-15 19:19:55 +0200328 if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
329 return snd_soc_add_platform(dev, &pcm->platform,
330 &dmaengine_no_residue_pcm_platform);
331 else
332 return snd_soc_add_platform(dev, &pcm->platform,
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200333 &dmaengine_pcm_platform);
334}
335EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
336
337/**
338 * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
339 * @dev: Parent device the PCM was register with
340 *
341 * Removes a dmaengine based PCM device previously registered with
342 * snd_dmaengine_pcm_register.
343 */
344void snd_dmaengine_pcm_unregister(struct device *dev)
345{
346 struct snd_soc_platform *platform;
347 struct dmaengine_pcm *pcm;
348 unsigned int i;
349
350 platform = snd_soc_lookup_platform(dev);
351 if (!platform)
352 return;
353
354 pcm = soc_platform_to_pcm(platform);
355
356 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200357 if (pcm->chan[i]) {
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200358 dma_release_channel(pcm->chan[i]);
Lars-Peter Clausend1e14062013-04-20 19:29:00 +0200359 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
360 break;
361 }
Lars-Peter Clausen28c44682013-04-15 19:19:50 +0200362 }
363
364 snd_soc_remove_platform(platform);
365 kfree(pcm);
366}
367EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
368
369MODULE_LICENSE("GPL");