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         .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");