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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 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 /* sDMA supports only 1, 2, and 4 byte transfer elements. */
 57 static void omap_pcm_limit_supported_formats(void)
 58 {
 59         int i;
 60 
 61         for (i = 0; i < SNDRV_PCM_FORMAT_LAST; i++) {
 62                 switch (snd_pcm_format_physical_width(i)) {
 63                 case 8:
 64                 case 16:
 65                 case 32:
 66                         omap_pcm_hardware.formats |= (1LL << i);
 67                         break;
 68                 default:
 69                         break;
 70                 }
 71         }
 72 }
 73 
 74 /* this may get called several times by oss emulation */
 75 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 76                               struct snd_pcm_hw_params *params)
 77 {
 78         struct snd_pcm_runtime *runtime = substream->runtime;
 79         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 80         struct omap_pcm_dma_data *dma_data;
 81         struct dma_slave_config config;
 82         struct dma_chan *chan;
 83         int err = 0;
 84 
 85         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 86 
 87         /* return if this is a bufferless transfer e.g.
 88          * codec <--> BT codec or GSM modem -- lg FIXME */
 89         if (!dma_data)
 90                 return 0;
 91 
 92         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 93         runtime->dma_bytes = params_buffer_bytes(params);
 94 
 95         chan = snd_dmaengine_pcm_get_chan(substream);
 96         if (!chan)
 97                 return -EINVAL;
 98 
 99         /* fills in addr_width and direction */
100         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
101         if (err)
102                 return err;
103 
104         snd_dmaengine_pcm_set_config_from_dai_data(substream,
105                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
106                         &config);
107 
108         return dmaengine_slave_config(chan, &config);
109 }
110 
111 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
112 {
113         snd_pcm_set_runtime_buffer(substream, NULL);
114         return 0;
115 }
116 
117 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
118 {
119         snd_pcm_uframes_t offset;
120 
121         if (pcm_omap1510())
122                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
123         else
124                 offset = snd_dmaengine_pcm_pointer(substream);
125 
126         return offset;
127 }
128 
129 static int omap_pcm_open(struct snd_pcm_substream *substream)
130 {
131         struct snd_soc_pcm_runtime *rtd = substream->private_data;
132         struct snd_dmaengine_dai_dma_data *dma_data;
133         int ret;
134 
135         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
136 
137         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
138 
139         /* DT boot: filter_data is the DMA name */
140         if (rtd->cpu_dai->dev->of_node) {
141                 struct dma_chan *chan;
142 
143                 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
144                                                  dma_data->filter_data);
145                 ret = snd_dmaengine_pcm_open(substream, chan);
146         } else {
147                 ret = snd_dmaengine_pcm_open_request_chan(substream,
148                                                           omap_dma_filter_fn,
149                                                           dma_data->filter_data);
150         }
151         return ret;
152 }
153 
154 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
155         struct vm_area_struct *vma)
156 {
157         struct snd_pcm_runtime *runtime = substream->runtime;
158 
159         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
160                                      runtime->dma_area,
161                                      runtime->dma_addr,
162                                      runtime->dma_bytes);
163 }
164 
165 static struct snd_pcm_ops omap_pcm_ops = {
166         .open           = omap_pcm_open,
167         .close          = snd_dmaengine_pcm_close_release_chan,
168         .ioctl          = snd_pcm_lib_ioctl,
169         .hw_params      = omap_pcm_hw_params,
170         .hw_free        = omap_pcm_hw_free,
171         .trigger        = snd_dmaengine_pcm_trigger,
172         .pointer        = omap_pcm_pointer,
173         .mmap           = omap_pcm_mmap,
174 };
175 
176 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
177         int stream)
178 {
179         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
180         struct snd_dma_buffer *buf = &substream->dma_buffer;
181         size_t size = omap_pcm_hardware.buffer_bytes_max;
182 
183         buf->dev.type = SNDRV_DMA_TYPE_DEV;
184         buf->dev.dev = pcm->card->dev;
185         buf->private_data = NULL;
186         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
187                                            &buf->addr, GFP_KERNEL);
188         if (!buf->area)
189                 return -ENOMEM;
190 
191         buf->bytes = size;
192         return 0;
193 }
194 
195 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
196 {
197         struct snd_pcm_substream *substream;
198         struct snd_dma_buffer *buf;
199         int stream;
200 
201         for (stream = 0; stream < 2; stream++) {
202                 substream = pcm->streams[stream].substream;
203                 if (!substream)
204                         continue;
205 
206                 buf = &substream->dma_buffer;
207                 if (!buf->area)
208                         continue;
209 
210                 dma_free_writecombine(pcm->card->dev, buf->bytes,
211                                       buf->area, buf->addr);
212                 buf->area = NULL;
213         }
214 }
215 
216 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
217 {
218         struct snd_card *card = rtd->card->snd_card;
219         struct snd_pcm *pcm = rtd->pcm;
220         int ret;
221 
222         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
223         if (ret)
224                 return ret;
225 
226         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
227                 ret = omap_pcm_preallocate_dma_buffer(pcm,
228                         SNDRV_PCM_STREAM_PLAYBACK);
229                 if (ret)
230                         goto out;
231         }
232 
233         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
234                 ret = omap_pcm_preallocate_dma_buffer(pcm,
235                         SNDRV_PCM_STREAM_CAPTURE);
236                 if (ret)
237                         goto out;
238         }
239 
240 out:
241         /* free preallocated buffers in case of error */
242         if (ret)
243                 omap_pcm_free_dma_buffers(pcm);
244 
245         return ret;
246 }
247 
248 static struct snd_soc_platform_driver omap_soc_platform = {
249         .ops            = &omap_pcm_ops,
250         .pcm_new        = omap_pcm_new,
251         .pcm_free       = omap_pcm_free_dma_buffers,
252 };
253 
254 int omap_pcm_platform_register(struct device *dev)
255 {
256         omap_pcm_limit_supported_formats();
257         return devm_snd_soc_register_platform(dev, &omap_soc_platform);
258 }
259 EXPORT_SYMBOL_GPL(omap_pcm_platform_register);
260 
261 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
262 MODULE_DESCRIPTION("OMAP PCM DMA module");
263 MODULE_LICENSE("GPL");
264 

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