LXR linux/sound/soc/ti/edma-pcm.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
   4 *
   5 * Copyright (C) 2014 Texas Instruments, Inc.
   6 *
   7 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   8 *
   9 * Based on: sound/soc/tegra/tegra_pcm.c
  10 */
  11
  12#include <linux/module.h>
  13#include <sound/core.h>
  14#include <sound/pcm.h>
  15#include <sound/pcm_params.h>
  16#include <sound/soc.h>
  17#include <sound/dmaengine_pcm.h>
  18
  19#include "edma-pcm.h"
  20
  21static const struct snd_pcm_hardware edma_pcm_hardware = {
  22        .info                   = SNDRV_PCM_INFO_MMAP |
  23                                  SNDRV_PCM_INFO_MMAP_VALID |
  24                                  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
  25                                  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
  26                                  SNDRV_PCM_INFO_INTERLEAVED,
  27        .buffer_bytes_max       = 128 * 1024,
  28        .period_bytes_min       = 32,
  29        .period_bytes_max       = 64 * 1024,
  30        .periods_min            = 2,
  31        .periods_max            = 19, /* Limit by edma dmaengine driver */
  32};
  33
  34static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
  35        .pcm_hardware = &edma_pcm_hardware,
  36        .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  37        .prealloc_buffer_size = 128 * 1024,
  38};
  39
  40int edma_pcm_platform_register(struct device *dev)
  41{
  42        struct snd_dmaengine_pcm_config *config;
  43
  44        if (dev->of_node)
  45                return devm_snd_dmaengine_pcm_register(dev,
  46                                                &edma_dmaengine_pcm_config, 0);
  47
  48        config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
  49        if (!config)
  50                return -ENOMEM;
  51
  52        *config = edma_dmaengine_pcm_config;
  53
  54        config->chan_names[0] = "tx";
  55        config->chan_names[1] = "rx";
  56
  57        return devm_snd_dmaengine_pcm_register(dev, config, 0);
  58}
  59EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
  60
  61MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  62MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
  63MODULE_LICENSE("GPL");
  64