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

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  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         .formats                = SNDRV_PCM_FMTBIT_S16_LE |
 49                                   SNDRV_PCM_FMTBIT_S32_LE,
 50         .period_bytes_min       = 32,
 51         .period_bytes_max       = 64 * 1024,
 52         .periods_min            = 2,
 53         .periods_max            = 255,
 54         .buffer_bytes_max       = 128 * 1024,
 55 };
 56 
 57 /* this may get called several times by oss emulation */
 58 static int omap_pcm_hw_params(struct snd_pcm_substream *substream,
 59                               struct snd_pcm_hw_params *params)
 60 {
 61         struct snd_pcm_runtime *runtime = substream->runtime;
 62         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 63         struct omap_pcm_dma_data *dma_data;
 64         struct dma_slave_config config;
 65         struct dma_chan *chan;
 66         int err = 0;
 67 
 68         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 69 
 70         /* return if this is a bufferless transfer e.g.
 71          * codec <--> BT codec or GSM modem -- lg FIXME */
 72         if (!dma_data)
 73                 return 0;
 74 
 75         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 76         runtime->dma_bytes = params_buffer_bytes(params);
 77 
 78         chan = snd_dmaengine_pcm_get_chan(substream);
 79         if (!chan)
 80                 return -EINVAL;
 81 
 82         /* fills in addr_width and direction */
 83         err = snd_hwparams_to_dma_slave_config(substream, params, &config);
 84         if (err)
 85                 return err;
 86 
 87         snd_dmaengine_pcm_set_config_from_dai_data(substream,
 88                         snd_soc_dai_get_dma_data(rtd->cpu_dai, substream),
 89                         &config);
 90 
 91         return dmaengine_slave_config(chan, &config);
 92 }
 93 
 94 static int omap_pcm_hw_free(struct snd_pcm_substream *substream)
 95 {
 96         snd_pcm_set_runtime_buffer(substream, NULL);
 97         return 0;
 98 }
 99 
100 static snd_pcm_uframes_t omap_pcm_pointer(struct snd_pcm_substream *substream)
101 {
102         snd_pcm_uframes_t offset;
103 
104         if (pcm_omap1510())
105                 offset = snd_dmaengine_pcm_pointer_no_residue(substream);
106         else
107                 offset = snd_dmaengine_pcm_pointer(substream);
108 
109         return offset;
110 }
111 
112 static int omap_pcm_open(struct snd_pcm_substream *substream)
113 {
114         struct snd_soc_pcm_runtime *rtd = substream->private_data;
115         struct snd_dmaengine_dai_dma_data *dma_data;
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         return snd_dmaengine_pcm_open_request_chan(substream,
122                                                    omap_dma_filter_fn,
123                                                    dma_data->filter_data);
124 }
125 
126 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
127         struct vm_area_struct *vma)
128 {
129         struct snd_pcm_runtime *runtime = substream->runtime;
130 
131         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
132                                      runtime->dma_area,
133                                      runtime->dma_addr,
134                                      runtime->dma_bytes);
135 }
136 
137 static struct snd_pcm_ops omap_pcm_ops = {
138         .open           = omap_pcm_open,
139         .close          = snd_dmaengine_pcm_close_release_chan,
140         .ioctl          = snd_pcm_lib_ioctl,
141         .hw_params      = omap_pcm_hw_params,
142         .hw_free        = omap_pcm_hw_free,
143         .trigger        = snd_dmaengine_pcm_trigger,
144         .pointer        = omap_pcm_pointer,
145         .mmap           = omap_pcm_mmap,
146 };
147 
148 static u64 omap_pcm_dmamask = DMA_BIT_MASK(64);
149 
150 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
151         int stream)
152 {
153         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
154         struct snd_dma_buffer *buf = &substream->dma_buffer;
155         size_t size = omap_pcm_hardware.buffer_bytes_max;
156 
157         buf->dev.type = SNDRV_DMA_TYPE_DEV;
158         buf->dev.dev = pcm->card->dev;
159         buf->private_data = NULL;
160         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
161                                            &buf->addr, GFP_KERNEL);
162         if (!buf->area)
163                 return -ENOMEM;
164 
165         buf->bytes = size;
166         return 0;
167 }
168 
169 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
170 {
171         struct snd_pcm_substream *substream;
172         struct snd_dma_buffer *buf;
173         int stream;
174 
175         for (stream = 0; stream < 2; stream++) {
176                 substream = pcm->streams[stream].substream;
177                 if (!substream)
178                         continue;
179 
180                 buf = &substream->dma_buffer;
181                 if (!buf->area)
182                         continue;
183 
184                 dma_free_writecombine(pcm->card->dev, buf->bytes,
185                                       buf->area, buf->addr);
186                 buf->area = NULL;
187         }
188 }
189 
190 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
191 {
192         struct snd_card *card = rtd->card->snd_card;
193         struct snd_pcm *pcm = rtd->pcm;
194         int ret = 0;
195 
196         if (!card->dev->dma_mask)
197                 card->dev->dma_mask = &omap_pcm_dmamask;
198         if (!card->dev->coherent_dma_mask)
199                 card->dev->coherent_dma_mask = DMA_BIT_MASK(64);
200 
201         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
202                 ret = omap_pcm_preallocate_dma_buffer(pcm,
203                         SNDRV_PCM_STREAM_PLAYBACK);
204                 if (ret)
205                         goto out;
206         }
207 
208         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
209                 ret = omap_pcm_preallocate_dma_buffer(pcm,
210                         SNDRV_PCM_STREAM_CAPTURE);
211                 if (ret)
212                         goto out;
213         }
214 
215 out:
216         /* free preallocated buffers in case of error */
217         if (ret)
218                 omap_pcm_free_dma_buffers(pcm);
219 
220         return ret;
221 }
222 
223 static struct snd_soc_platform_driver omap_soc_platform = {
224         .ops            = &omap_pcm_ops,
225         .pcm_new        = omap_pcm_new,
226         .pcm_free       = omap_pcm_free_dma_buffers,
227 };
228 
229 static int omap_pcm_probe(struct platform_device *pdev)
230 {
231         return snd_soc_register_platform(&pdev->dev,
232                         &omap_soc_platform);
233 }
234 
235 static int omap_pcm_remove(struct platform_device *pdev)
236 {
237         snd_soc_unregister_platform(&pdev->dev);
238         return 0;
239 }
240 
241 static struct platform_driver omap_pcm_driver = {
242         .driver = {
243                         .name = "omap-pcm-audio",
244                         .owner = THIS_MODULE,
245         },
246 
247         .probe = omap_pcm_probe,
248         .remove = omap_pcm_remove,
249 };
250 
251 module_platform_driver(omap_pcm_driver);
252 
253 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
254 MODULE_DESCRIPTION("OMAP PCM DMA module");
255 MODULE_LICENSE("GPL");
256 MODULE_ALIAS("platform:omap-pcm-audio");
257 

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