sound/soc/tegra/tegra_pcm.c

   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
  27 static 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
  39 static 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
  45 int tegra_pcm_platform_register(struct device *dev)
  46 {
  47         return snd_dmaengine_pcm_register(dev, &tegra_dmaengine_pcm_config, 0);
  48 }
  49 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register);
  50
  51 int 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 }
  62 EXPORT_SYMBOL_GPL(tegra_pcm_platform_register_with_chan_names);
  63
  64 void tegra_pcm_platform_unregister(struct device *dev)
  65 {
  66         return snd_dmaengine_pcm_unregister(dev);
  67 }
  68 EXPORT_SYMBOL_GPL(tegra_pcm_platform_unregister);
  69
  70 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
  71 MODULE_DESCRIPTION("Tegra PCM ASoC driver");
  72 MODULE_LICENSE("GPL");