sound/soc/omap/sdma-pcm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
   4  *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
   5  */
   6
   7 #include <linux/module.h>
   8 #include <sound/core.h>
   9 #include <sound/pcm.h>
  10 #include <sound/pcm_params.h>
  11 #include <sound/soc.h>
  12 #include <sound/dmaengine_pcm.h>
  13 #include <linux/omap-dma.h>
  14
  15 #include "sdma-pcm.h"
  16
  17 static const struct snd_pcm_hardware sdma_pcm_hardware = {
  18         .info                   = SNDRV_PCM_INFO_MMAP |
  19                                   SNDRV_PCM_INFO_MMAP_VALID |
  20                                   SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
  21                                   SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
  22                                   SNDRV_PCM_INFO_INTERLEAVED,
  23         .period_bytes_min       = 32,
  24         .period_bytes_max       = 64 * 1024,
  25         .buffer_bytes_max       = 128 * 1024,
  26         .periods_min            = 2,
  27         .periods_max            = 255,
  28 };
  29
  30 static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
  31         .pcm_hardware = &sdma_pcm_hardware,
  32         .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
  33         .compat_filter_fn = omap_dma_filter_fn,
  34         .prealloc_buffer_size = 128 * 1024,
  35 };
  36
  37 int sdma_pcm_platform_register(struct device *dev,
  38                                char *txdmachan, char *rxdmachan)
  39 {
  40         struct snd_dmaengine_pcm_config *config;
  41         unsigned int flags = SND_DMAENGINE_PCM_FLAG_COMPAT;
  42
  43         /* Standard names for the directions: 'tx' and 'rx' */
  44         if (!txdmachan && !rxdmachan)
  45                 return devm_snd_dmaengine_pcm_register(dev,
  46                                                 &sdma_dmaengine_pcm_config,
  47                                                 flags);
  48
  49         config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
  50         if (!config)
  51                 return -ENOMEM;
  52
  53         *config = sdma_dmaengine_pcm_config;
  54
  55         if (!txdmachan || !rxdmachan) {
  56                 /* One direction only PCM */
  57                 flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
  58                 if (!txdmachan) {
  59                         txdmachan = rxdmachan;
  60                         rxdmachan = NULL;
  61                 }
  62         }
  63
  64         config->chan_names[0] = txdmachan;
  65         config->chan_names[1] = rxdmachan;
  66
  67         return devm_snd_dmaengine_pcm_register(dev, config, flags);
  68 }
  69 EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
  70
  71 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
  72 MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
  73 MODULE_LICENSE("GPL v2");