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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 /*
 28  * The platforms dmaengine driver does not support reporting the amount of
 29  * bytes that are still left to transfer.
 30  */
 31 #define SND_DMAENGINE_PCM_FLAG_NO_RESIDUE BIT(31)
 32 
 33 struct dmaengine_pcm {
 34         struct dma_chan *chan[SNDRV_PCM_STREAM_LAST + 1];
 35         const struct snd_dmaengine_pcm_config *config;
 36         struct snd_soc_platform platform;
 37         unsigned int flags;
 38 };
 39 
 40 static struct dmaengine_pcm *soc_platform_to_pcm(struct snd_soc_platform *p)
 41 {
 42         return container_of(p, struct dmaengine_pcm, platform);
 43 }
 44 
 45 static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
 46         struct snd_pcm_substream *substream)
 47 {
 48         if (!pcm->chan[substream->stream])
 49                 return NULL;
 50 
 51         return pcm->chan[substream->stream]->device->dev;
 52 }
 53 
 54 /**
 55  * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
 56  * @substream: PCM substream
 57  * @params: hw_params
 58  * @slave_config: DMA slave config to prepare
 59  *
 60  * This function can be used as a generic prepare_slave_config callback for
 61  * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
 62  * DAI DMA data. Internally the function will first call
 63  * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
 64  * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
 65  * remaining fields based on the DAI DMA data.
 66  */
 67 int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
 68         struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
 69 {
 70         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 71         struct snd_dmaengine_dai_dma_data *dma_data;
 72         int ret;
 73 
 74         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 75 
 76         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
 77         if (ret)
 78                 return ret;
 79 
 80         snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
 81                 slave_config);
 82 
 83         return 0;
 84 }
 85 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
 86 
 87 static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
 88         struct snd_pcm_hw_params *params)
 89 {
 90         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 91         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
 92         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 93         int (*prepare_slave_config)(struct snd_pcm_substream *substream,
 94                         struct snd_pcm_hw_params *params,
 95                         struct dma_slave_config *slave_config);
 96         struct dma_slave_config slave_config;
 97         int ret;
 98 
 99         memset(&slave_config, 0, sizeof(slave_config));
100 
101         if (!pcm->config)
102                 prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config;
103         else
104                 prepare_slave_config = pcm->config->prepare_slave_config;
105 
106         if (prepare_slave_config) {
107                 ret = prepare_slave_config(substream, params, &slave_config);
108                 if (ret)
109                         return ret;
110 
111                 ret = dmaengine_slave_config(chan, &slave_config);
112                 if (ret)
113                         return ret;
114         }
115 
116         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
117 }
118 
119 static int dmaengine_pcm_set_runtime_hwparams(struct snd_pcm_substream *substream)
120 {
121         struct snd_soc_pcm_runtime *rtd = substream->private_data;
122         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
123         struct device *dma_dev = dmaengine_dma_dev(pcm, substream);
124         struct dma_chan *chan = pcm->chan[substream->stream];
125         struct snd_dmaengine_dai_dma_data *dma_data;
126         struct dma_slave_caps dma_caps;
127         struct snd_pcm_hardware hw;
128         u32 addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
129                           BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
130                           BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
131         int i, ret;
132 
133         if (pcm->config && pcm->config->pcm_hardware)
134                 return snd_soc_set_runtime_hwparams(substream,
135                                 pcm->config->pcm_hardware);
136 
137         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
138 
139         memset(&hw, 0, sizeof(hw));
140         hw.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
141                         SNDRV_PCM_INFO_INTERLEAVED;
142         hw.periods_min = 2;
143         hw.periods_max = UINT_MAX;
144         hw.period_bytes_min = 256;
145         hw.period_bytes_max = dma_get_max_seg_size(dma_dev);
146         hw.buffer_bytes_max = SIZE_MAX;
147         hw.fifo_size = dma_data->fifo_size;
148 
149         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
150                 hw.info |= SNDRV_PCM_INFO_BATCH;
151 
152         ret = dma_get_slave_caps(chan, &dma_caps);
153         if (ret == 0) {
154                 if (dma_caps.cmd_pause)
155                         hw.info |= SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME;
156                 if (dma_caps.residue_granularity <= DMA_RESIDUE_GRANULARITY_SEGMENT)
157                         hw.info |= SNDRV_PCM_INFO_BATCH;
158 
159                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
160                         addr_widths = dma_caps.dst_addr_widths;
161                 else
162                         addr_widths = dma_caps.src_addr_widths;
163         }
164 
165         /*
166          * If SND_DMAENGINE_PCM_DAI_FLAG_PACK is set keep
167          * hw.formats set to 0, meaning no restrictions are in place.
168          * In this case it's the responsibility of the DAI driver to
169          * provide the supported format information.
170          */
171         if (!(dma_data->flags & SND_DMAENGINE_PCM_DAI_FLAG_PACK))
172                 /*
173                  * Prepare formats mask for valid/allowed sample types. If the
174                  * dma does not have support for the given physical word size,
175                  * it needs to be masked out so user space can not use the
176                  * format which produces corrupted audio.
177                  * In case the dma driver does not implement the slave_caps the
178                  * default assumption is that it supports 1, 2 and 4 bytes
179                  * widths.
180                  */
181                 for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
182                         int bits = snd_pcm_format_physical_width(i);
183 
184                         /*
185                          * Enable only samples with DMA supported physical
186                          * widths
187                          */
188                         switch (bits) {
189                         case 8:
190                         case 16:
191                         case 24:
192                         case 32:
193                         case 64:
194                                 if (addr_widths & (1 << (bits / 8)))
195                                         hw.formats |= (1LL << i);
196                                 break;
197                         default:
198                                 /* Unsupported types */
199                                 break;
200                         }
201                 }
202 
203         return snd_soc_set_runtime_hwparams(substream, &hw);
204 }
205 
206 static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
207 {
208         struct snd_soc_pcm_runtime *rtd = substream->private_data;
209         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
210         struct dma_chan *chan = pcm->chan[substream->stream];
211         int ret;
212 
213         ret = dmaengine_pcm_set_runtime_hwparams(substream);
214         if (ret)
215                 return ret;
216 
217         return snd_dmaengine_pcm_open(substream, chan);
218 }
219 
220 static struct dma_chan *dmaengine_pcm_compat_request_channel(
221         struct snd_soc_pcm_runtime *rtd,
222         struct snd_pcm_substream *substream)
223 {
224         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
225         struct snd_dmaengine_dai_dma_data *dma_data;
226         dma_filter_fn fn = NULL;
227 
228         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
229 
230         if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
231                 return pcm->chan[0];
232 
233         if (pcm->config && pcm->config->compat_request_channel)
234                 return pcm->config->compat_request_channel(rtd, substream);
235 
236         if (pcm->config)
237                 fn = pcm->config->compat_filter_fn;
238 
239         return snd_dmaengine_pcm_request_channel(fn, dma_data->filter_data);
240 }
241 
242 static bool dmaengine_pcm_can_report_residue(struct device *dev,
243         struct dma_chan *chan)
244 {
245         struct dma_slave_caps dma_caps;
246         int ret;
247 
248         ret = dma_get_slave_caps(chan, &dma_caps);
249         if (ret != 0) {
250                 dev_warn(dev, "Failed to get DMA channel capabilities, falling back to period counting: %d\n",
251                          ret);
252                 return false;
253         }
254 
255         if (dma_caps.residue_granularity == DMA_RESIDUE_GRANULARITY_DESCRIPTOR)
256                 return false;
257 
258         return true;
259 }
260 
261 static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
262 {
263         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
264         const struct snd_dmaengine_pcm_config *config = pcm->config;
265         struct device *dev = rtd->platform->dev;
266         struct snd_pcm_substream *substream;
267         size_t prealloc_buffer_size;
268         size_t max_buffer_size;
269         unsigned int i;
270         int ret;
271 
272         if (config && config->prealloc_buffer_size) {
273                 prealloc_buffer_size = config->prealloc_buffer_size;
274                 max_buffer_size = config->pcm_hardware->buffer_bytes_max;
275         } else {
276                 prealloc_buffer_size = 512 * 1024;
277                 max_buffer_size = SIZE_MAX;
278         }
279 
280         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
281                 substream = rtd->pcm->streams[i].substream;
282                 if (!substream)
283                         continue;
284 
285                 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
286                         pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
287                                 substream);
288                 }
289 
290                 if (!pcm->chan[i]) {
291                         dev_err(rtd->platform->dev,
292                                 "Missing dma channel for stream: %d\n", i);
293                         return -EINVAL;
294                 }
295 
296                 ret = snd_pcm_lib_preallocate_pages(substream,
297                                 SNDRV_DMA_TYPE_DEV_IRAM,
298                                 dmaengine_dma_dev(pcm, substream),
299                                 prealloc_buffer_size,
300                                 max_buffer_size);
301                 if (ret)
302                         return ret;
303 
304                 if (!dmaengine_pcm_can_report_residue(dev, pcm->chan[i]))
305                         pcm->flags |= SND_DMAENGINE_PCM_FLAG_NO_RESIDUE;
306         }
307 
308         return 0;
309 }
310 
311 static snd_pcm_uframes_t dmaengine_pcm_pointer(
312         struct snd_pcm_substream *substream)
313 {
314         struct snd_soc_pcm_runtime *rtd = substream->private_data;
315         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
316 
317         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
318                 return snd_dmaengine_pcm_pointer_no_residue(substream);
319         else
320                 return snd_dmaengine_pcm_pointer(substream);
321 }
322 
323 static const struct snd_pcm_ops dmaengine_pcm_ops = {
324         .open           = dmaengine_pcm_open,
325         .close          = snd_dmaengine_pcm_close,
326         .ioctl          = snd_pcm_lib_ioctl,
327         .hw_params      = dmaengine_pcm_hw_params,
328         .hw_free        = snd_pcm_lib_free_pages,
329         .trigger        = snd_dmaengine_pcm_trigger,
330         .pointer        = dmaengine_pcm_pointer,
331 };
332 
333 static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
334         .component_driver = {
335                 .probe_order = SND_SOC_COMP_ORDER_LATE,
336         },
337         .ops            = &dmaengine_pcm_ops,
338         .pcm_new        = dmaengine_pcm_new,
339 };
340 
341 static const char * const dmaengine_pcm_dma_channel_names[] = {
342         [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
343         [SNDRV_PCM_STREAM_CAPTURE] = "rx",
344 };
345 
346 static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
347         struct device *dev, const struct snd_dmaengine_pcm_config *config)
348 {
349         unsigned int i;
350         const char *name;
351         struct dma_chan *chan;
352 
353         if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node)
354                 return 0;
355 
356         if (config && config->dma_dev) {
357                 /*
358                  * If this warning is seen, it probably means that your Linux
359                  * device structure does not match your HW device structure.
360                  * It would be best to refactor the Linux device structure to
361                  * correctly match the HW structure.
362                  */
363                 dev_warn(dev, "DMA channels sourced from device %s",
364                          dev_name(config->dma_dev));
365                 dev = config->dma_dev;
366         }
367 
368         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
369              i++) {
370                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
371                         name = "rx-tx";
372                 else
373                         name = dmaengine_pcm_dma_channel_names[i];
374                 if (config && config->chan_names[i])
375                         name = config->chan_names[i];
376                 chan = dma_request_slave_channel_reason(dev, name);
377                 if (IS_ERR(chan)) {
378                         if (PTR_ERR(chan) == -EPROBE_DEFER)
379                                 return -EPROBE_DEFER;
380                         pcm->chan[i] = NULL;
381                 } else {
382                         pcm->chan[i] = chan;
383                 }
384                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
385                         break;
386         }
387 
388         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
389                 pcm->chan[1] = pcm->chan[0];
390 
391         return 0;
392 }
393 
394 static void dmaengine_pcm_release_chan(struct dmaengine_pcm *pcm)
395 {
396         unsigned int i;
397 
398         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE;
399              i++) {
400                 if (!pcm->chan[i])
401                         continue;
402                 dma_release_channel(pcm->chan[i]);
403                 if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
404                         break;
405         }
406 }
407 
408 /**
409  * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
410  * @dev: The parent device for the PCM device
411  * @config: Platform specific PCM configuration
412  * @flags: Platform specific quirks
413  */
414 int snd_dmaengine_pcm_register(struct device *dev,
415         const struct snd_dmaengine_pcm_config *config, unsigned int flags)
416 {
417         struct dmaengine_pcm *pcm;
418         int ret;
419 
420         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
421         if (!pcm)
422                 return -ENOMEM;
423 
424         pcm->config = config;
425         pcm->flags = flags;
426 
427         ret = dmaengine_pcm_request_chan_of(pcm, dev, config);
428         if (ret)
429                 goto err_free_dma;
430 
431         ret = snd_soc_add_platform(dev, &pcm->platform,
432                 &dmaengine_pcm_platform);
433         if (ret)
434                 goto err_free_dma;
435 
436         return 0;
437 
438 err_free_dma:
439         dmaengine_pcm_release_chan(pcm);
440         kfree(pcm);
441         return ret;
442 }
443 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
444 
445 /**
446  * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
447  * @dev: Parent device the PCM was register with
448  *
449  * Removes a dmaengine based PCM device previously registered with
450  * snd_dmaengine_pcm_register.
451  */
452 void snd_dmaengine_pcm_unregister(struct device *dev)
453 {
454         struct snd_soc_platform *platform;
455         struct dmaengine_pcm *pcm;
456 
457         platform = snd_soc_lookup_platform(dev);
458         if (!platform)
459                 return;
460 
461         pcm = soc_platform_to_pcm(platform);
462 
463         snd_soc_remove_platform(platform);
464         dmaengine_pcm_release_chan(pcm);
465         kfree(pcm);
466 }
467 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
468 
469 MODULE_LICENSE("GPL");
470 

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