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Linux/sound/soc/omap/omap-pcm.c

  1 /*
  2  * omap-pcm.c  --  ALSA PCM interface for the OMAP SoC
  3  *
  4  * Copyright (C) 2008 Nokia Corporation
  5  *
  6  * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
  7  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License
 11  * version 2 as published by the Free Software Foundation.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16  * General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 21  * 02110-1301 USA
 22  *
 23  */
 24 
 25 #include <linux/dma-mapping.h>
 26 #include <linux/slab.h>
 27 #include <linux/module.h>
 28 #include <linux/omap-dma.h>
 29 #include <sound/core.h>
 30 #include <sound/pcm.h>
 31 #include <sound/pcm_params.h>
 32 #include <sound/dmaengine_pcm.h>
 33 #include <sound/soc.h>
 34 #include <sound/omap-pcm.h>
 35 
 36 #ifdef CONFIG_ARCH_OMAP1
 37 #define pcm_omap1510()  cpu_is_omap1510()
 38 #else
 39 #define pcm_omap1510()  0
 40 #endif
 41 
 42 static const struct snd_pcm_hardware omap_pcm_hardware = {
 43         .info                   = SNDRV_PCM_INFO_MMAP |
 44                                   SNDRV_PCM_INFO_MMAP_VALID |
 45                                   SNDRV_PCM_INFO_INTERLEAVED |
 46                                   SNDRV_PCM_INFO_PAUSE |
 47                                   SNDRV_PCM_INFO_RESUME |
 48                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
 49         .period_bytes_min       = 32,
 50         .period_bytes_max       = 64 * 1024,
 51         .periods_min            = 2,
 52         .periods_max            = 255,
 53         .buffer_bytes_max       = 128 * 1024,
 54 };
 55 
 56 /* this may get called several times by oss emulation */
 57 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 58                               struct snd_pcm_hw_params *params)
 59 {
 60         struct snd_pcm_runtime *runtime = substream->runtime;
 61         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 62         struct omap_pcm_dma_data *dma_data;
 63         struct dma_slave_config config;
 64         struct dma_chan *chan;
 65         int err = 0;
 66 
 67         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 68 
 69         /* return if this is a bufferless transfer e.g.
 70          * codec <--> BT codec or GSM modem -- lg FIXME */
 71         if (!dma_data)
 72                 return 0;
 73 
 74         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 75         runtime->dma_bytes = params_buffer_bytes(params);
 76 
 77         chan = snd_dmaengine_pcm_get_chan(substream);
 78         if (!chan)
 79                 return -EINVAL;
 80 
 81         /* fills in addr_width and direction */
 82         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 83         if (err)
 84                 return err;
 85 
 86         snd_dmaengine_pcm_set_config_from_dai_data(substream,
 87                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 88                         &config);
 89 
 90         return dmaengine_slave_config(chan, &config);
 91 }
 92 
 93 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 94 {
 95         snd_pcm_set_runtime_buffer(substream, NULL);
 96         return 0;
 97 }
 98 
 99 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
100 {
101         snd_pcm_uframes_t offset;
102 
103         if (pcm_omap1510())
104                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
105         else
106                 offset = snd_dmaengine_pcm_pointer(substream);
107 
108         return offset;
109 }
110 
111 static int omap_pcm_open(struct snd_pcm_substream *substream)
112 {
113         struct snd_soc_pcm_runtime *rtd = substream->private_data;
114         struct snd_dmaengine_dai_dma_data *dma_data;
115         int ret;
116 
117         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
118 
119         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
120 
121         /* DT boot: filter_data is the DMA name */
122         if (rtd->cpu_dai->dev->of_node) {
123                 struct dma_chan *chan;
124 
125                 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
126                                                  dma_data->filter_data);
127                 ret = snd_dmaengine_pcm_open(substream, chan);
128         } else {
129                 ret = snd_dmaengine_pcm_open_request_chan(substream,
130                                                           omap_dma_filter_fn,
131                                                           dma_data->filter_data);
132         }
133         return ret;
134 }
135 
136 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
137         struct vm_area_struct *vma)
138 {
139         struct snd_pcm_runtime *runtime = substream->runtime;
140 
141         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
142                                      runtime->dma_area,
143                                      runtime->dma_addr,
144                                      runtime->dma_bytes);
145 }
146 
147 static struct snd_pcm_ops omap_pcm_ops = {
148         .open           = omap_pcm_open,
149         .close          = snd_dmaengine_pcm_close_release_chan,
150         .ioctl          = snd_pcm_lib_ioctl,
151         .hw_params      = omap_pcm_hw_params,
152         .hw_free        = omap_pcm_hw_free,
153         .trigger        = snd_dmaengine_pcm_trigger,
154         .pointer        = omap_pcm_pointer,
155         .mmap           = omap_pcm_mmap,
156 };
157 
158 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
159         int stream)
160 {
161         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
162         struct snd_dma_buffer *buf = &substream->dma_buffer;
163         size_t size = omap_pcm_hardware.buffer_bytes_max;
164 
165         buf->dev.type = SNDRV_DMA_TYPE_DEV;
166         buf->dev.dev = pcm->card->dev;
167         buf->private_data = NULL;
168         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
169                                            &buf->addr, GFP_KERNEL);
170         if (!buf->area)
171                 return -ENOMEM;
172 
173         buf->bytes = size;
174         return 0;
175 }
176 
177 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
178 {
179         struct snd_pcm_substream *substream;
180         struct snd_dma_buffer *buf;
181         int stream;
182 
183         for (stream = 0; stream < 2; stream++) {
184                 substream = pcm->streams[stream].substream;
185                 if (!substream)
186                         continue;
187 
188                 buf = &substream->dma_buffer;
189                 if (!buf->area)
190                         continue;
191 
192                 dma_free_writecombine(pcm->card->dev, buf->bytes,
193                                       buf->area, buf->addr);
194                 buf->area = NULL;
195         }
196 }
197 
198 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
199 {
200         struct snd_card *card = rtd->card->snd_card;
201         struct snd_pcm *pcm = rtd->pcm;
202         int ret;
203 
204         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
205         if (ret)
206                 return ret;
207 
208         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
209                 ret = omap_pcm_preallocate_dma_buffer(pcm,
210                         SNDRV_PCM_STREAM_PLAYBACK);
211                 if (ret)
212                         goto out;
213         }
214 
215         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
216                 ret = omap_pcm_preallocate_dma_buffer(pcm,
217                         SNDRV_PCM_STREAM_CAPTURE);
218                 if (ret)
219                         goto out;
220         }
221 
222 out:
223         /* free preallocated buffers in case of error */
224         if (ret)
225                 omap_pcm_free_dma_buffers(pcm);
226 
227         return ret;
228 }
229 
230 static struct snd_soc_platform_driver omap_soc_platform = {
231         .ops            = &omap_pcm_ops,
232         .pcm_new        = omap_pcm_new,
233         .pcm_free       = omap_pcm_free_dma_buffers,
234 };
235 
236 int omap_pcm_platform_register(struct device *dev)
237 {
238         return devm_snd_soc_register_platform(dev, &omap_soc_platform);
239 }
240 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
241 
242 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
243 MODULE_DESCRIPTION("OMAP PCM DMA module");
244 MODULE_LICENSE("GPL");
245 

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