LXR linux/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
  30static 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
  43static 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
  50int 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}
  55EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
  56
  57MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  58MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
  59MODULE_LICENSE("GPL");
  60