sound/soc/davinci/edma-pcm.c

   1 /*
   2  * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
   3  *
   4  * Copyright (C) 2014 Texas Instruments, Inc.
   5  *
   6  * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   7  *
   8  * Based on: sound/soc/tegra/tegra_pcm.c
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * version 2 as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/soc.h>
  25 #include <sound/dmaengine_pcm.h>
  26 #include <linux/edma.h>
  27
  28 #include "edma-pcm.h"
  29
  30 static const struct snd_pcm_hardware edma_pcm_hardware = {
  31         .info                   = SNDRV_PCM_INFO_MMAP |
  32                                   SNDRV_PCM_INFO_MMAP_VALID |
  33                                   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
  34                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
  35                                   SNDRV_PCM_INFO_INTERLEAVED,
  36         .buffer_bytes_max       = 128 * 1024,
  37         .period_bytes_min       = 32,
  38         .period_bytes_max       = 64 * 1024,
  39         .periods_min            = 2,
  40         .periods_max            = 19, /* Limit by edma dmaengine driver */
  41 };
  42
  43 static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
  44         .pcm_hardware = &edma_pcm_hardware,
  45         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  46         .compat_filter_fn = edma_filter_fn,
  47         .prealloc_buffer_size = 128 * 1024,
  48 };
  49
  50 int edma_pcm_platform_register(struct device *dev)
  51 {
  52         return devm_snd_dmaengine_pcm_register(dev, &edma_dmaengine_pcm_config,
  53                                         SND_DMAENGINE_PCM_FLAG_COMPAT);
  54 }
  55 EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
  56
  57 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  58 MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
  59 MODULE_LICENSE("GPL");