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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 
 35 #ifdef CONFIG_ARCH_OMAP1
 36 #define pcm_omap1510()  cpu_is_omap1510()
 37 #else
 38 #define pcm_omap1510()  0
 39 #endif
 40 
 41 static const struct snd_pcm_hardware omap_pcm_hardware = {
 42         .info                   = SNDRV_PCM_INFO_MMAP |
 43                                   SNDRV_PCM_INFO_MMAP_VALID |
 44                                   SNDRV_PCM_INFO_INTERLEAVED |
 45                                   SNDRV_PCM_INFO_PAUSE |
 46                                   SNDRV_PCM_INFO_RESUME |
 47                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
 48         .period_bytes_min       = 32,
 49         .period_bytes_max       = 64 * 1024,
 50         .periods_min            = 2,
 51         .periods_max            = 255,
 52         .buffer_bytes_max       = 128 * 1024,
 53 };
 54 
 55 /* this may get called several times by oss emulation */
 56 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 57                               struct snd_pcm_hw_params *params)
 58 {
 59         struct snd_pcm_runtime *runtime = substream->runtime;
 60         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 61         struct omap_pcm_dma_data *dma_data;
 62         struct dma_slave_config config;
 63         struct dma_chan *chan;
 64         int err = 0;
 65 
 66         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 67 
 68         /* return if this is a bufferless transfer e.g.
 69          * codec <--> BT codec or GSM modem -- lg FIXME */
 70         if (!dma_data)
 71                 return 0;
 72 
 73         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 74         runtime->dma_bytes = params_buffer_bytes(params);
 75 
 76         chan = snd_dmaengine_pcm_get_chan(substream);
 77         if (!chan)
 78                 return -EINVAL;
 79 
 80         /* fills in addr_width and direction */
 81         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 82         if (err)
 83                 return err;
 84 
 85         snd_dmaengine_pcm_set_config_from_dai_data(substream,
 86                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 87                         &config);
 88 
 89         return dmaengine_slave_config(chan, &config);
 90 }
 91 
 92 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 93 {
 94         snd_pcm_set_runtime_buffer(substream, NULL);
 95         return 0;
 96 }
 97 
 98 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
 99 {
100         snd_pcm_uframes_t offset;
101 
102         if (pcm_omap1510())
103                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
104         else
105                 offset = snd_dmaengine_pcm_pointer(substream);
106 
107         return offset;
108 }
109 
110 static int omap_pcm_open(struct snd_pcm_substream *substream)
111 {
112         struct snd_soc_pcm_runtime *rtd = substream->private_data;
113         struct snd_dmaengine_dai_dma_data *dma_data;
114         int ret;
115 
116         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
117 
118         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
119 
120         /* DT boot: filter_data is the DMA name */
121         if (rtd->cpu_dai->dev->of_node) {
122                 struct dma_chan *chan;
123 
124                 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
125                                                  dma_data->filter_data);
126                 ret = snd_dmaengine_pcm_open(substream, chan);
127         } else {
128                 ret = snd_dmaengine_pcm_open_request_chan(substream,
129                                                           omap_dma_filter_fn,
130                                                           dma_data->filter_data);
131         }
132         return ret;
133 }
134 
135 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
136         struct vm_area_struct *vma)
137 {
138         struct snd_pcm_runtime *runtime = substream->runtime;
139 
140         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
141                                      runtime->dma_area,
142                                      runtime->dma_addr,
143                                      runtime->dma_bytes);
144 }
145 
146 static struct snd_pcm_ops omap_pcm_ops = {
147         .open           = omap_pcm_open,
148         .close          = snd_dmaengine_pcm_close_release_chan,
149         .ioctl          = snd_pcm_lib_ioctl,
150         .hw_params      = omap_pcm_hw_params,
151         .hw_free        = omap_pcm_hw_free,
152         .trigger        = snd_dmaengine_pcm_trigger,
153         .pointer        = omap_pcm_pointer,
154         .mmap           = omap_pcm_mmap,
155 };
156 
157 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
158         int stream)
159 {
160         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
161         struct snd_dma_buffer *buf = &substream->dma_buffer;
162         size_t size = omap_pcm_hardware.buffer_bytes_max;
163 
164         buf->dev.type = SNDRV_DMA_TYPE_DEV;
165         buf->dev.dev = pcm->card->dev;
166         buf->private_data = NULL;
167         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
168                                            &buf->addr, GFP_KERNEL);
169         if (!buf->area)
170                 return -ENOMEM;
171 
172         buf->bytes = size;
173         return 0;
174 }
175 
176 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
177 {
178         struct snd_pcm_substream *substream;
179         struct snd_dma_buffer *buf;
180         int stream;
181 
182         for (stream = 0; stream < 2; stream++) {
183                 substream = pcm->streams[stream].substream;
184                 if (!substream)
185                         continue;
186 
187                 buf = &substream->dma_buffer;
188                 if (!buf->area)
189                         continue;
190 
191                 dma_free_writecombine(pcm->card->dev, buf->bytes,
192                                       buf->area, buf->addr);
193                 buf->area = NULL;
194         }
195 }
196 
197 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
198 {
199         struct snd_card *card = rtd->card->snd_card;
200         struct snd_pcm *pcm = rtd->pcm;
201         int ret;
202 
203         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
204         if (ret)
205                 return ret;
206 
207         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
208                 ret = omap_pcm_preallocate_dma_buffer(pcm,
209                         SNDRV_PCM_STREAM_PLAYBACK);
210                 if (ret)
211                         goto out;
212         }
213 
214         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
215                 ret = omap_pcm_preallocate_dma_buffer(pcm,
216                         SNDRV_PCM_STREAM_CAPTURE);
217                 if (ret)
218                         goto out;
219         }
220 
221 out:
222         /* free preallocated buffers in case of error */
223         if (ret)
224                 omap_pcm_free_dma_buffers(pcm);
225 
226         return ret;
227 }
228 
229 static struct snd_soc_platform_driver omap_soc_platform = {
230         .ops            = &omap_pcm_ops,
231         .pcm_new        = omap_pcm_new,
232         .pcm_free       = omap_pcm_free_dma_buffers,
233 };
234 
235 int omap_pcm_platform_register(struct device *dev)
236 {
237         return devm_snd_soc_register_platform(dev, &omap_soc_platform);
238 }
239 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
240 
241 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
242 MODULE_DESCRIPTION("OMAP PCM DMA module");
243 MODULE_LICENSE("GPL");
244 

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