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 static int omap_pcm_probe(struct platform_device *pdev)
 236 {
 237         return snd_soc_register_platform(&pdev->dev,
 238                         &omap_soc_platform);
 239 }
 240
 241 static int omap_pcm_remove(struct platform_device *pdev)
 242 {
 243         snd_soc_unregister_platform(&pdev->dev);
 244         return 0;
 245 }
 246
 247 static struct platform_driver omap_pcm_driver = {
 248         .driver = {
 249                         .name = "omap-pcm-audio",
 250                         .owner = THIS_MODULE,
 251         },
 252
 253         .probe = omap_pcm_probe,
 254         .remove = omap_pcm_remove,
 255 };
 256
 257 module_platform_driver(omap_pcm_driver);
 258
 259 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 260 MODULE_DESCRIPTION("OMAP PCM DMA module");
 261 MODULE_LICENSE("GPL");
 262 MODULE_ALIAS("platform:omap-pcm-audio");