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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         u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
123                           BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
124                           BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
125         int i, ret;
126 
127         if (pcm->config && pcm->config->pcm_hardware)
128                 return snd_soc_set_runtime_hwparams(substream,
129                                 pcm->config->pcm_hardware);
130 
131         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
132 
133         memset(&hw, 0, sizeof(hw));
134         hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
135                         SNDRV_PCM_INFO_INTERLEAVED;
136         hw.periods_min = 2;
137         hw.periods_max = UINT_MAX;
138         hw.period_bytes_min = 256;
139         hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
140         hw.buffer_bytes_max = SIZE_MAX;
141         hw.fifo_size = dma_data->fifo_size;
142 
143         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
144                 hw.info |= SNDRV_PCM_INFO_BATCH;
145 
146         ret = dma_get_slave_caps(chan, &dma_caps);
147         if (ret == 0) {
148                 if (dma_caps.cmd_pause)
149                         hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
150                 if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
151                         hw.info |= SNDRV_PCM_INFO_BATCH;
152 
153                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
154                         addr_widths = dma_caps.dst_addr_widths;
155                 else
156                         addr_widths = dma_caps.src_addr_widths;
157         }
158 
159         /*
160          * Prepare formats mask for valid/allowed sample types. If the dma does
161          * not have support for the given physical word size, it needs to be
162          * masked out so user space can not use the format which produces
163          * corrupted audio.
164          * In case the dma driver does not implement the slave_caps the default
165          * assumption is that it supports 1, 2 and 4 bytes widths.
166          */
167         for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
168                 int bits = snd_pcm_format_physical_width(i);
169 
170                 /* Enable only samples with DMA supported physical widths */
171                 switch (bits) {
172                 case 8:
173                 case 16:
174                 case 24:
175                 case 32:
176                 case 64:
177                         if (addr_widths & (1 << (bits / 8)))
178                                 hw.formats |= (1LL << i);
179                         break;
180                 default:
181                         /* Unsupported types */
182                         break;
183                 }
184         }
185 
186         return snd_soc_set_runtime_hwparams(substream, &hw);
187 }
188 
189 static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
190 {
191         struct snd_soc_pcm_runtime *rtd = substream->private_data;
192         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
193         struct dma_chan *chan = pcm->chan[substream->stream];
194         int ret;
195 
196         ret = dmaengine_pcm_set_runtime_hwparams(substream);
197         if (ret)
198                 return ret;
199 
200         return snd_dmaengine_pcm_open(substream, chan);
201 }
202 
203 static struct dma_chan *dmaengine_pcm_compat_request_channel(
204         struct snd_soc_pcm_runtime *rtd,
205         struct snd_pcm_substream *substream)
206 {
207         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
208         struct snd_dmaengine_dai_dma_data *dma_data;
209         dma_filter_fn fn = NULL;
210 
211         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
212 
213         if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
214                 return pcm->chan[0];
215 
216         if (pcm->config && pcm->config->compat_request_channel)
217                 return pcm->config->compat_request_channel(rtd, substream);
218 
219         if (pcm->config)
220                 fn = pcm->config->compat_filter_fn;
221 
222         return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);
223 }
224 
225 static bool dmaengine_pcm_can_report_residue(struct dma_chan *chan)
226 {
227         struct dma_slave_caps dma_caps;
228         int ret;
229 
230         ret = dma_get_slave_caps(chan, &dma_caps);
231         if (ret != 0)
232                 return true;
233 
234         if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
235                 return false;
236 
237         return true;
238 }
239 
240 static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
241 {
242         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
243         const struct snd_dmaengine_pcm_config *config = pcm->config;
244         struct device *dev = rtd->platform->dev;
245         struct snd_dmaengine_dai_dma_data *dma_data;
246         struct snd_pcm_substream *substream;
247         size_t prealloc_buffer_size;
248         size_t max_buffer_size;
249         unsigned int i;
250         int ret;
251 
252         if (config && config->prealloc_buffer_size) {
253                 prealloc_buffer_size = config->prealloc_buffer_size;
254                 max_buffer_size = config->pcm_hardware->buffer_bytes_max;
255         } else {
256                 prealloc_buffer_size = 512 * 1024;
257                 max_buffer_size = SIZE_MAX;
258         }
259 
260 
261         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
262                 substream = rtd->pcm->streams[i].substream;
263                 if (!substream)
264                         continue;
265 
266                 dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
267 
268                 if (!pcm->chan[i] &&
269                     (pcm->flags & SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME))
270                         pcm->chan[i] = dma_request_slave_channel(dev,
271                                 dma_data->chan_name);
272 
273                 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
274                         pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
275                                 substream);
276                 }
277 
278                 if (!pcm->chan[i]) {
279                         dev_err(rtd->platform->dev,
280                                 "Missing dma channel for stream: %d\n", i);
281                         return -EINVAL;
282                 }
283 
284                 ret = snd_pcm_lib_preallocate_pages(substream,
285                                 SNDRV_DMA_TYPE_DEV_IRAM,
286                                 dmaengine_dma_dev(pcm, substream),
287                                 prealloc_buffer_size,
288                                 max_buffer_size);
289                 if (ret)
290                         return ret;
291 
292                 /*
293                  * This will only return false if we know for sure that at least
294                  * one channel does not support residue reporting. If the DMA
295                  * driver does not implement the slave_caps API we rely having
296                  * the NO_RESIDUE flag set manually in case residue reporting is
297                  * not supported.
298                  */
299                 if (!dmaengine_pcm_can_report_residue(pcm->chan[i]))
300                         pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;
301         }
302 
303         return 0;
304 }
305 
306 static snd_pcm_uframes_t dmaengine_pcm_pointer(
307         struct snd_pcm_substream *substream)
308 {
309         struct snd_soc_pcm_runtime *rtd = substream->private_data;
310         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
311 
312         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
313                 return snd_dmaengine_pcm_pointer_no_residue(substream);
314         else
315                 return snd_dmaengine_pcm_pointer(substream);
316 }
317 
318 static const struct snd_pcm_ops dmaengine_pcm_ops = {
319         .open           = dmaengine_pcm_open,
320         .close          = snd_dmaengine_pcm_close,
321         .ioctl          = snd_pcm_lib_ioctl,
322         .hw_params      = dmaengine_pcm_hw_params,
323         .hw_free        = snd_pcm_lib_free_pages,
324         .trigger        = snd_dmaengine_pcm_trigger,
325         .pointer        = dmaengine_pcm_pointer,
326 };
327 
328 static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
329         .component_driver = {
330                 .probe_order = SND_SOC_COMP_ORDER_LATE,
331         },
332         .ops            = &dmaengine_pcm_ops,
333         .pcm_new        = dmaengine_pcm_new,
334 };
335 
336 static const char * const dmaengine_pcm_dma_channel_names[] = {
337         [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
338         [SNDRV_PCM_STREAM_CAPTURE] = "rx",
339 };
340 
341 static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
342         struct device *dev, const struct snd_dmaengine_pcm_config *config)
343 {
344         unsigned int i;
345         const char *name;
346         struct dma_chan *chan;
347 
348         if ((pcm->flags & (SND_DMAENGINE_PCM_FLAG_NO_DT |
349                            SND_DMAENGINE_PCM_FLAG_CUSTOM_CHANNEL_NAME)) ||
350             !dev->of_node)
351                 return 0;
352 
353         if (config && config->dma_dev) {
354                 /*
355                  * If this warning is seen, it probably means that your Linux
356                  * device structure does not match your HW device structure.
357                  * It would be best to refactor the Linux device structure to
358                  * correctly match the HW structure.
359                  */
360                 dev_warn(dev, "DMA channels sourced from device %s",
361                          dev_name(config->dma_dev));
362                 dev = config->dma_dev;
363         }
364 
365         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
366              i++) {
367                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
368                         name = "rx-tx";
369                 else
370                         name = dmaengine_pcm_dma_channel_names[i];
371                 if (config && config->chan_names[i])
372                         name = config->chan_names[i];
373                 chan = dma_request_slave_channel_reason(dev, name);
374                 if (IS_ERR(chan)) {
375                         if (PTR_ERR(chan) == -EPROBE_DEFER)
376                                 return -EPROBE_DEFER;
377                         pcm->chan[i] = NULL;
378                 } else {
379                         pcm->chan[i] = chan;
380                 }
381                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
382                         break;
383         }
384 
385         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
386                 pcm->chan[1] = pcm->chan[0];
387 
388         return 0;
389 }
390 
391 static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
392 {
393         unsigned int i;
394 
395         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
396              i++) {
397                 if (!pcm->chan[i])
398                         continue;
399                 dma_release_channel(pcm->chan[i]);
400                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
401                         break;
402         }
403 }
404 
405 /**
406  * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
407  * @dev: The parent device for the PCM device
408  * @config: Platform specific PCM configuration
409  * @flags: Platform specific quirks
410  */
411 int snd_dmaengine_pcm_register(struct device *dev,
412         const struct snd_dmaengine_pcm_config *config, unsigned int flags)
413 {
414         struct dmaengine_pcm *pcm;
415         int ret;
416 
417         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
418         if (!pcm)
419                 return -ENOMEM;
420 
421         pcm->config = config;
422         pcm->flags = flags;
423 
424         ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
425         if (ret)
426                 goto err_free_dma;
427 
428         ret = snd_soc_add_platform(dev, &pcm->platform,
429                 &dmaengine_pcm_platform);
430         if (ret)
431                 goto err_free_dma;
432 
433         return 0;
434 
435 err_free_dma:
436         dmaengine_pcm_release_chan(pcm);
437         kfree(pcm);
438         return ret;
439 }
440 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
441 
442 /**
443  * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
444  * @dev: Parent device the PCM was register with
445  *
446  * Removes a dmaengine based PCM device previously registered with
447  * snd_dmaengine_pcm_register.
448  */
449 void snd_dmaengine_pcm_unregister(struct device *dev)
450 {
451         struct snd_soc_platform *platform;
452         struct dmaengine_pcm *pcm;
453 
454         platform = snd_soc_lookup_platform(dev);
455         if (!platform)
456                 return;
457 
458         pcm = soc_platform_to_pcm(platform);
459 
460         snd_soc_remove_platform(platform);
461         dmaengine_pcm_release_chan(pcm);
462         kfree(pcm);
463 }
464 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
465 
466 MODULE_LICENSE("GPL");
467 

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