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