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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_CAPTURE + 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 /**
 40  * snd_dmaengine_pcm_prepare_slave_config() - Generic prepare_slave_config callback
 41  * @substream: PCM substream
 42  * @params: hw_params
 43  * @slave_config: DMA slave config to prepare
 44  *
 45  * This function can be used as a generic prepare_slave_config callback for
 46  * platforms which make use of the snd_dmaengine_dai_dma_data struct for their
 47  * DAI DMA data. Internally the function will first call
 48  * snd_hwparams_to_dma_slave_config to fill in the slave config based on the
 49  * hw_params, followed by snd_dmaengine_set_config_from_dai_data to fill in the
 50  * remaining fields based on the DAI DMA data.
 51  */
 52 int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
 53         struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config)
 54 {
 55         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 56         struct snd_dmaengine_dai_dma_data *dma_data;
 57         int ret;
 58 
 59         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 60 
 61         ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
 62         if (ret)
 63                 return ret;
 64 
 65         snd_dmaengine_pcm_set_config_from_dai_data(substream, dma_data,
 66                 slave_config);
 67 
 68         return 0;
 69 }
 70 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_prepare_slave_config);
 71 
 72 static int dmaengine_pcm_hw_params(struct snd_pcm_substream *substream,
 73         struct snd_pcm_hw_params *params)
 74 {
 75         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 76         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
 77         struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
 78         struct dma_slave_config slave_config;
 79         int ret;
 80 
 81         if (pcm->config->prepare_slave_config) {
 82                 ret = pcm->config->prepare_slave_config(substream, params,
 83                                 &slave_config);
 84                 if (ret)
 85                         return ret;
 86 
 87                 ret = dmaengine_slave_config(chan, &slave_config);
 88                 if (ret)
 89                         return ret;
 90         }
 91 
 92         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
 93 }
 94 
 95 static int dmaengine_pcm_open(struct snd_pcm_substream *substream)
 96 {
 97         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 98         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
 99         struct dma_chan *chan = pcm->chan[substream->stream];
100         int ret;
101 
102         ret = snd_soc_set_runtime_hwparams(substream,
103                                 pcm->config->pcm_hardware);
104         if (ret)
105                 return ret;
106 
107         return snd_dmaengine_pcm_open(substream, chan);
108 }
109 
110 static struct device *dmaengine_dma_dev(struct dmaengine_pcm *pcm,
111         struct snd_pcm_substream *substream)
112 {
113         if (!pcm->chan[substream->stream])
114                 return NULL;
115 
116         return pcm->chan[substream->stream]->device->dev;
117 }
118 
119 static void dmaengine_pcm_free(struct snd_pcm *pcm)
120 {
121         snd_pcm_lib_preallocate_free_for_all(pcm);
122 }
123 
124 static struct dma_chan *dmaengine_pcm_compat_request_channel(
125         struct snd_soc_pcm_runtime *rtd,
126         struct snd_pcm_substream *substream)
127 {
128         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
129 
130         if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) && pcm->chan[0])
131                 return pcm->chan[0];
132 
133         if (pcm->config->compat_request_channel)
134                 return pcm->config->compat_request_channel(rtd, substream);
135 
136         return snd_dmaengine_pcm_request_channel(pcm->config->compat_filter_fn,
137                 snd_soc_dai_get_dma_data(rtd->cpu_dai, substream));
138 }
139 
140 static int dmaengine_pcm_new(struct snd_soc_pcm_runtime *rtd)
141 {
142         struct dmaengine_pcm *pcm = soc_platform_to_pcm(rtd->platform);
143         const struct snd_dmaengine_pcm_config *config = pcm->config;
144         struct snd_pcm_substream *substream;
145         unsigned int i;
146         int ret;
147 
148         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
149                 substream = rtd->pcm->streams[i].substream;
150                 if (!substream)
151                         continue;
152 
153                 if (!pcm->chan[i] && (pcm->flags & SND_DMAENGINE_PCM_FLAG_COMPAT)) {
154                         pcm->chan[i] = dmaengine_pcm_compat_request_channel(rtd,
155                                 substream);
156                 }
157 
158                 if (!pcm->chan[i]) {
159                         dev_err(rtd->platform->dev,
160                                 "Missing dma channel for stream: %d\n", i);
161                         ret = -EINVAL;
162                         goto err_free;
163                 }
164 
165                 ret = snd_pcm_lib_preallocate_pages(substream,
166                                 SNDRV_DMA_TYPE_DEV,
167                                 dmaengine_dma_dev(pcm, substream),
168                                 config->prealloc_buffer_size,
169                                 config->pcm_hardware->buffer_bytes_max);
170                 if (ret)
171                         goto err_free;
172         }
173 
174         return 0;
175 
176 err_free:
177         dmaengine_pcm_free(rtd->pcm);
178         return ret;
179 }
180 
181 static const struct snd_pcm_ops dmaengine_pcm_ops = {
182         .open           = dmaengine_pcm_open,
183         .close          = snd_dmaengine_pcm_close,
184         .ioctl          = snd_pcm_lib_ioctl,
185         .hw_params      = dmaengine_pcm_hw_params,
186         .hw_free        = snd_pcm_lib_free_pages,
187         .trigger        = snd_dmaengine_pcm_trigger,
188         .pointer        = snd_dmaengine_pcm_pointer,
189 };
190 
191 static const struct snd_soc_platform_driver dmaengine_pcm_platform = {
192         .ops            = &dmaengine_pcm_ops,
193         .pcm_new        = dmaengine_pcm_new,
194         .pcm_free       = dmaengine_pcm_free,
195         .probe_order    = SND_SOC_COMP_ORDER_LATE,
196 };
197 
198 static const struct snd_pcm_ops dmaengine_no_residue_pcm_ops = {
199         .open           = dmaengine_pcm_open,
200         .close          = snd_dmaengine_pcm_close,
201         .ioctl          = snd_pcm_lib_ioctl,
202         .hw_params      = dmaengine_pcm_hw_params,
203         .hw_free        = snd_pcm_lib_free_pages,
204         .trigger        = snd_dmaengine_pcm_trigger,
205         .pointer        = snd_dmaengine_pcm_pointer_no_residue,
206 };
207 
208 static const struct snd_soc_platform_driver dmaengine_no_residue_pcm_platform = {
209         .ops            = &dmaengine_no_residue_pcm_ops,
210         .pcm_new        = dmaengine_pcm_new,
211         .pcm_free       = dmaengine_pcm_free,
212         .probe_order    = SND_SOC_COMP_ORDER_LATE,
213 };
214 
215 static const char * const dmaengine_pcm_dma_channel_names[] = {
216         [SNDRV_PCM_STREAM_PLAYBACK] = "tx",
217         [SNDRV_PCM_STREAM_CAPTURE] = "rx",
218 };
219 
220 static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
221         struct device *dev)
222 {
223         unsigned int i;
224 
225         if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !dev->of_node)
226                 return;
227 
228         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
229                 pcm->chan[0] = dma_request_slave_channel(dev, "rx-tx");
230                 pcm->chan[1] = pcm->chan[0];
231         } else {
232                 for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
233                         pcm->chan[i] = dma_request_slave_channel(dev,
234                                         dmaengine_pcm_dma_channel_names[i]);
235                 }
236         }
237 }
238 
239 /**
240  * snd_dmaengine_pcm_register - Register a dmaengine based PCM device
241  * @dev: The parent device for the PCM device
242  * @config: Platform specific PCM configuration
243  * @flags: Platform specific quirks
244  */
245 int snd_dmaengine_pcm_register(struct device *dev,
246         const struct snd_dmaengine_pcm_config *config, unsigned int flags)
247 {
248         struct dmaengine_pcm *pcm;
249 
250         pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
251         if (!pcm)
252                 return -ENOMEM;
253 
254         pcm->config = config;
255         pcm->flags = flags;
256 
257         dmaengine_pcm_request_chan_of(pcm, dev);
258 
259         if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
260                 return snd_soc_add_platform(dev, &pcm->platform,
261                                 &dmaengine_no_residue_pcm_platform);
262         else
263                 return snd_soc_add_platform(dev, &pcm->platform,
264                                 &dmaengine_pcm_platform);
265 }
266 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
267 
268 /**
269  * snd_dmaengine_pcm_unregister - Removes a dmaengine based PCM device
270  * @dev: Parent device the PCM was register with
271  *
272  * Removes a dmaengine based PCM device previously registered with
273  * snd_dmaengine_pcm_register.
274  */
275 void snd_dmaengine_pcm_unregister(struct device *dev)
276 {
277         struct snd_soc_platform *platform;
278         struct dmaengine_pcm *pcm;
279         unsigned int i;
280 
281         platform = snd_soc_lookup_platform(dev);
282         if (!platform)
283                 return;
284 
285         pcm = soc_platform_to_pcm(platform);
286 
287         for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
288                 if (pcm->chan[i]) {
289                         dma_release_channel(pcm->chan[i]);
290                         if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX)
291                                 break;
292                 }
293         }
294 
295         snd_soc_remove_platform(platform);
296         kfree(pcm);
297 }
298 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_unregister);
299 
300 MODULE_LICENSE("GPL");
301 

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