LXR linux/sound/soc/tegra/tegra

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * tegra_pcm.c - Tegra PCM driver
   4 *
   5 * Author: Stephen Warren <swarren@nvidia.com>
   6 * Copyright (C) 2010,2012 - NVIDIA, Inc.
   7 *
   8 * Based on code copyright/by:
   9 *
  10 * Copyright (c) 2009-2010, NVIDIA Corporation.
  11 * Scott Peterson <speterson@nvidia.com>
  12 * Vijay Mali <vmali@nvidia.com>
  13 *
  14 * Copyright (C) 2010 Google, Inc.
  15 * Iliyan Malchev <malchev@google.com>
  16 */
  17
  18#include <linux/module.h>
  19#include <sound/core.h>
  20#include <sound/pcm.h>
  21#include <sound/pcm_params.h>
  22#include <sound/soc.h>
  23#include <sound/dmaengine_pcm.h>
  24
  25#include "tegra_pcm.h"
  26
  27static const struct snd_pcm_hardware tegra_pcm_hardware = {
  28        .info                   = SNDRV_PCM_INFO_MMAP |
  29                                  SNDRV_PCM_INFO_MMAP_VALID |
  30                                  SNDRV_PCM_INFO_INTERLEAVED,
  31        .period_bytes_min       = 1024,
  32        .period_bytes_max       = PAGE_SIZE,
  33        .periods_min            = 2,
  34        .periods_max            = 8,
  35        .buffer_bytes_max       = PAGE_SIZE * 8,
  36        .fifo_size              = 4,
  37};
  38
  39static const struct snd_dmaengine_pcm_config tegra_dmaengine_pcm_config = {
  40        .pcm_hardware = &tegra_pcm_hardware,
  41        .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  42        .prealloc_buffer_size = PAGE_SIZE * 8,
  43};
  44
  45int tegra_pcm_platform_register(struct device *dev)
  46{
  47        return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
  48}
  49EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
  50
  51int tegra_pcm_platform_register_with_chan_names(struct device *dev,
  52                                struct snd_dmaengine_pcm_config *config,
  53                                char *txdmachan, char *rxdmachan)
  54{
  55        *config = tegra_dmaengine_pcm_config;
  56        config->dma_dev = dev->parent;
  57        config->chan_names[0] = txdmachan;
  58        config->chan_names[1] = rxdmachan;
  59
  60        return snd_dmaengine_pcm_register(dev, config, 0);
  61}
  62EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
  63
  64void tegra_pcm_platform_unregister(struct device *dev)
  65{
  66        return snd_dmaengine_pcm_unregister(dev);
  67}
  68EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
  69
  70MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
  71MODULE_DESCRIPTION("Tegra PCM ASoC driver");
  72MODULE_LICENSE("GPL");
  73