LXR linux/sound/soc/cirrus/ep93xx-pcm.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
   4 *
   5 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   6 * Copyright (C) 2006 Applied Data Systems
   7 *
   8 * Rewritten for the SoC audio subsystem (Based on PXA2xx code):
   9 *   Copyright (c) 2008 Ryan Mallon
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/platform_device.h>
  15#include <linux/dmaengine.h>
  16
  17#include <sound/pcm.h>
  18#include <sound/soc.h>
  19#include <sound/dmaengine_pcm.h>
  20
  21#include <linux/platform_data/dma-ep93xx.h>
  22
  23#include "ep93xx-pcm.h"
  24
  25static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
  26        .info                   = (SNDRV_PCM_INFO_MMAP          |
  27                                   SNDRV_PCM_INFO_MMAP_VALID    |
  28                                   SNDRV_PCM_INFO_INTERLEAVED   |
  29                                   SNDRV_PCM_INFO_BLOCK_TRANSFER),
  30        .buffer_bytes_max       = 131072,
  31        .period_bytes_min       = 32,
  32        .period_bytes_max       = 32768,
  33        .periods_min            = 1,
  34        .periods_max            = 32,
  35        .fifo_size              = 32,
  36};
  37
  38static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
  39{
  40        struct ep93xx_dma_data *data = filter_param;
  41
  42        if (data->direction == ep93xx_dma_chan_direction(chan)) {
  43                chan->private = data;
  44                return true;
  45        }
  46
  47        return false;
  48}
  49
  50static const struct snd_dmaengine_pcm_config ep93xx_dmaengine_pcm_config = {
  51        .pcm_hardware = &ep93xx_pcm_hardware,
  52        .compat_filter_fn = ep93xx_pcm_dma_filter,
  53        .prealloc_buffer_size = 131072,
  54};
  55
  56int devm_ep93xx_pcm_platform_register(struct device *dev)
  57{
  58        return devm_snd_dmaengine_pcm_register(dev,
  59                &ep93xx_dmaengine_pcm_config,
  60                SND_DMAENGINE_PCM_FLAG_NO_DT |
  61                SND_DMAENGINE_PCM_FLAG_COMPAT);
  62}
  63EXPORT_SYMBOL_GPL(devm_ep93xx_pcm_platform_register);
  64
  65MODULE_AUTHOR("Ryan Mallon");
  66MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
  67MODULE_LICENSE("GPL");
  68