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         int ret;
 117
 118         snd_soc_set_runtime_hwparams(substream, &omap_pcm_hardware);
 119
 120         dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
 121
 122         /* DT boot: filter_data is the DMA name */
 123         if (rtd->cpu_dai->dev->of_node) {
 124                 struct dma_chan *chan;
 125
 126                 chan = dma_request_slave_channel(rtd->cpu_dai->dev,
 127                                                  dma_data->filter_data);
 128                 ret = snd_dmaengine_pcm_open(substream, chan);
 129         } else {
 130                 ret = snd_dmaengine_pcm_open_request_chan(substream,
 131                                                           omap_dma_filter_fn,
 132                                                           dma_data->filter_data);
 133         }
 134         return ret;
 135 }
 136
 137 static int omap_pcm_mmap(struct snd_pcm_substream *substream,
 138         struct vm_area_struct *vma)
 139 {
 140         struct snd_pcm_runtime *runtime = substream->runtime;
 141
 142         return dma_mmap_writecombine(substream->pcm->card->dev, vma,
 143                                      runtime->dma_area,
 144                                      runtime->dma_addr,
 145                                      runtime->dma_bytes);
 146 }
 147
 148 static struct snd_pcm_ops omap_pcm_ops = {
 149         .open           = omap_pcm_open,
 150         .close          = snd_dmaengine_pcm_close_release_chan,
 151         .ioctl          = snd_pcm_lib_ioctl,
 152         .hw_params      = omap_pcm_hw_params,
 153         .hw_free        = omap_pcm_hw_free,
 154         .trigger        = snd_dmaengine_pcm_trigger,
 155         .pointer        = omap_pcm_pointer,
 156         .mmap           = omap_pcm_mmap,
 157 };
 158
 159 static int omap_pcm_preallocate_dma_buffer(struct snd_pcm *pcm,
 160         int stream)
 161 {
 162         struct snd_pcm_substream *substream = pcm->streams[stream].substream;
 163         struct snd_dma_buffer *buf = &substream->dma_buffer;
 164         size_t size = omap_pcm_hardware.buffer_bytes_max;
 165
 166         buf->dev.type = SNDRV_DMA_TYPE_DEV;
 167         buf->dev.dev = pcm->card->dev;
 168         buf->private_data = NULL;
 169         buf->area = dma_alloc_writecombine(pcm->card->dev, size,
 170                                            &buf->addr, GFP_KERNEL);
 171         if (!buf->area)
 172                 return -ENOMEM;
 173
 174         buf->bytes = size;
 175         return 0;
 176 }
 177
 178 static void omap_pcm_free_dma_buffers(struct snd_pcm *pcm)
 179 {
 180         struct snd_pcm_substream *substream;
 181         struct snd_dma_buffer *buf;
 182         int stream;
 183
 184         for (stream = 0; stream < 2; stream++) {
 185                 substream = pcm->streams[stream].substream;
 186                 if (!substream)
 187                         continue;
 188
 189                 buf = &substream->dma_buffer;
 190                 if (!buf->area)
 191                         continue;
 192
 193                 dma_free_writecombine(pcm->card->dev, buf->bytes,
 194                                       buf->area, buf->addr);
 195                 buf->area = NULL;
 196         }
 197 }
 198
 199 static int omap_pcm_new(struct snd_soc_pcm_runtime *rtd)
 200 {
 201         struct snd_card *card = rtd->card->snd_card;
 202         struct snd_pcm *pcm = rtd->pcm;
 203         int ret;
 204
 205         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(64));
 206         if (ret)
 207                 return ret;
 208
 209         if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
 210                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 211                         SNDRV_PCM_STREAM_PLAYBACK);
 212                 if (ret)
 213                         goto out;
 214         }
 215
 216         if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
 217                 ret = omap_pcm_preallocate_dma_buffer(pcm,
 218                         SNDRV_PCM_STREAM_CAPTURE);
 219                 if (ret)
 220                         goto out;
 221         }
 222
 223 out:
 224         /* free preallocated buffers in case of error */
 225         if (ret)
 226                 omap_pcm_free_dma_buffers(pcm);
 227
 228         return ret;
 229 }
 230
 231 static struct snd_soc_platform_driver omap_soc_platform = {
 232         .ops            = &omap_pcm_ops,
 233         .pcm_new        = omap_pcm_new,
 234         .pcm_free       = omap_pcm_free_dma_buffers,
 235 };
 236
 237 static int omap_pcm_probe(struct platform_device *pdev)
 238 {
 239         return snd_soc_register_platform(&pdev->dev,
 240                         &omap_soc_platform);
 241 }
 242
 243 static int omap_pcm_remove(struct platform_device *pdev)
 244 {
 245         snd_soc_unregister_platform(&pdev->dev);
 246         return 0;
 247 }
 248
 249 static struct platform_driver omap_pcm_driver = {
 250         .driver = {
 251                         .name = "omap-pcm-audio",
 252                         .owner = THIS_MODULE,
 253         },
 254
 255         .probe = omap_pcm_probe,
 256         .remove = omap_pcm_remove,
 257 };
 258
 259 module_platform_driver(omap_pcm_driver);
 260
 261 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
 262 MODULE_DESCRIPTION("OMAP PCM DMA module");
 263 MODULE_LICENSE("GPL");
 264 MODULE_ALIAS("platform:omap-pcm-audio");