cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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imx-pcm-dma.c (1257B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
      4 *
      5 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
      6 *
      7 * This code is based on code copyrighted by Freescale,
      8 * Liam Girdwood, Javier Martin and probably others.
      9 */
     10#include <linux/platform_device.h>
     11#include <linux/dmaengine.h>
     12#include <linux/types.h>
     13#include <linux/module.h>
     14
     15#include <sound/core.h>
     16#include <sound/pcm.h>
     17#include <sound/soc.h>
     18#include <sound/dmaengine_pcm.h>
     19
     20#include "imx-pcm.h"
     21
     22static bool filter(struct dma_chan *chan, void *param)
     23{
     24	if (!imx_dma_is_general_purpose(chan))
     25		return false;
     26
     27	chan->private = param;
     28
     29	return true;
     30}
     31
     32static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
     33	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
     34	.compat_filter_fn = filter,
     35};
     36
     37int imx_pcm_dma_init(struct platform_device *pdev)
     38{
     39	struct snd_dmaengine_pcm_config *config;
     40
     41	config = devm_kzalloc(&pdev->dev,
     42			sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
     43	if (!config)
     44		return -ENOMEM;
     45	*config = imx_dmaengine_pcm_config;
     46
     47	return devm_snd_dmaengine_pcm_register(&pdev->dev,
     48		config,
     49		SND_DMAENGINE_PCM_FLAG_COMPAT);
     50}
     51EXPORT_SYMBOL_GPL(imx_pcm_dma_init);
     52
     53MODULE_LICENSE("GPL");