cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ep93xx-pcm.c (1747B)

      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");