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TOMOYO Linux Cross Reference
Linux/sound/soc/soc-generic-dmaengine-pcm.c

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  1 /*
  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>
 24 
 25 #include <sound/dmaengine_pcm.h>
 26 
 27 struct dmaengine_pcm {
 28         struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
 29         const struct snd_dmaengine_pcm_config *config;
 30         struct snd_soc_platform platform;
 31         unsigned int flags;
 32 };
 33 
 34 static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
 35 {
 36         return container_of(p, struct dmaengine_pcm, platform);
 37 }
 38 
 39 static 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 
 48 /**
 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  */
 61 int 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 }
 79 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
 80 
 81 static 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);
 87         int (*prepare_slave_config)(struct snd_pcm_substream *substream,
 88                         struct snd_pcm_hw_params *params,
 89                         struct dma_slave_config *slave_config);
 90         struct dma_slave_config slave_config;
 91         int ret;
 92 
 93         memset(&slave_config, 0, sizeof(slave_config));
 94 
 95         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);
102                 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 
113 static 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 
124         if (pcm->config && pcm->config->pcm_hardware)
125                 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 
149 static 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 
156         ret = dmaengine_pcm_set_runtime_hwparams(substream);
157         if (ret)
158                 return ret;
159 
160         return snd_dmaengine_pcm_open(substream, chan);
161 }
162 
163 static void dmaengine_pcm_free(struct snd_pcm *pcm)
164 {
165         snd_pcm_lib_preallocate_free_for_all(pcm);
166 }
167 
168 static 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);
173         struct snd_dmaengine_dai_dma_data *dma_data;
174 
175         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
176 
177         if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
178                 return pcm->chan[0];
179 
180         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,
184                                                  dma_data->filter_data);
185 }
186 
187 static 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;
191         struct device *dev = rtd->platform->dev;
192         struct snd_dmaengine_dai_dma_data *dma_data;
193         struct snd_pcm_substream *substream;
194         size_t prealloc_buffer_size;
195         size_t max_buffer_size;
196         unsigned int i;
197         int ret;
198 
199         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 
208         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 
213                 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 
220                 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
221                         pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
222                                 substream);
223                 }
224 
225                 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_IRAM,
234                                 dmaengine_dma_dev(pcm, substream),
235                                 prealloc_buffer_size,
236                                 max_buffer_size);
237                 if (ret)
238                         goto err_free;
239         }
240 
241         return 0;
242 
243 err_free:
244         dmaengine_pcm_free(rtd->pcm);
245         return ret;
246 }
247 
248 static 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 
258 static 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,
262         .probe_order    = SND_SOC_COMP_ORDER_LATE,
263 };
264 
265 static 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 
275 static 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 
282 static const char * const dmaengine_pcm_dma_channel_names[] = {
283         [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
284         [SNDRV_PCM_STREAM_CAPTURE] = "rx",
285 };
286 
287 static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
288         struct device *dev)
289 {
290         unsigned int i;
291 
292         if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
293                            SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
294             !dev->of_node)
295                 return;
296 
297         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
298                 pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
299                 pcm->chan[1] = pcm->chan[0];
300         } else {
301                 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
302                         pcm->chan[i] = dma_request_slave_channel(dev,
303                                         dmaengine_pcm_dma_channel_names[i]);
304                 }
305         }
306 }
307 
308 static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
309 {
310         unsigned int i;
311 
312         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
313              i++) {
314                 if (!pcm->chan[i])
315                         continue;
316                 dma_release_channel(pcm->chan[i]);
317                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
318                         break;
319         }
320 }
321 
322 /**
323  * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
324  * @dev: The parent device for the PCM device
325  * @config: Platform specific PCM configuration
326  * @flags: Platform specific quirks
327  */
328 int snd_dmaengine_pcm_register(struct device *dev,
329         const struct snd_dmaengine_pcm_config *config, unsigned int flags)
330 {
331         struct dmaengine_pcm *pcm;
332         int ret;
333 
334         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
335         if (!pcm)
336                 return -ENOMEM;
337 
338         pcm->config = config;
339         pcm->flags = flags;
340 
341         dmaengine_pcm_request_chan_of(pcm, dev);
342 
343         if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
344                 ret = snd_soc_add_platform(dev, &pcm->platform,
345                                 &dmaengine_no_residue_pcm_platform);
346         else
347                 ret = snd_soc_add_platform(dev, &pcm->platform,
348                                 &dmaengine_pcm_platform);
349         if (ret)
350                 goto err_free_dma;
351 
352         return 0;
353 
354 err_free_dma:
355         dmaengine_pcm_release_chan(pcm);
356         kfree(pcm);
357         return ret;
358 }
359 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
360 
361 /**
362  * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
363  * @dev: Parent device the PCM was register with
364  *
365  * Removes a dmaengine based PCM device previously registered with
366  * snd_dmaengine_pcm_register.
367  */
368 void snd_dmaengine_pcm_unregister(struct device *dev)
369 {
370         struct snd_soc_platform *platform;
371         struct dmaengine_pcm *pcm;
372 
373         platform = snd_soc_lookup_platform(dev);
374         if (!platform)
375                 return;
376 
377         pcm = soc_platform_to_pcm(platform);
378 
379         snd_soc_remove_platform(platform);
380         dmaengine_pcm_release_chan(pcm);
381         kfree(pcm);
382 }
383 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
384 
385 MODULE_LICENSE("GPL");
386 

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