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