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
  21 static 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
  34 static 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
  40 int 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 }
  59 EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
  60
  61 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  62 MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
  63 MODULE_LICENSE("GPL");