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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edma-pcm.c (1721B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * edma-pcm.c - eDMA PCM driver using dmaengine for AM3xxx, AM4xxx
      4 *
      5 * Copyright (C) 2014 Texas Instruments, Inc.
      6 *
      7 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
      8 *
      9 * Based on: sound/soc/tegra/tegra_pcm.c
     10 */
     11
     12#include <linux/module.h>
     13#include <sound/core.h>
     14#include <sound/pcm.h>
     15#include <sound/pcm_params.h>
     16#include <sound/soc.h>
     17#include <sound/dmaengine_pcm.h>
     18
     19#include "edma-pcm.h"
     20
     21static const struct snd_pcm_hardware edma_pcm_hardware = {
     22	.info			= SNDRV_PCM_INFO_MMAP |
     23				  SNDRV_PCM_INFO_MMAP_VALID |
     24				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
     25				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
     26				  SNDRV_PCM_INFO_INTERLEAVED,
     27	.buffer_bytes_max	= 128 * 1024,
     28	.period_bytes_min	= 32,
     29	.period_bytes_max	= 64 * 1024,
     30	.periods_min		= 2,
     31	.periods_max		= 19, /* Limit by edma dmaengine driver */
     32};
     33
     34static const struct snd_dmaengine_pcm_config edma_dmaengine_pcm_config = {
     35	.pcm_hardware = &edma_pcm_hardware,
     36	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
     37	.prealloc_buffer_size = 128 * 1024,
     38};
     39
     40int edma_pcm_platform_register(struct device *dev)
     41{
     42	struct snd_dmaengine_pcm_config *config;
     43
     44	if (dev->of_node)
     45		return devm_snd_dmaengine_pcm_register(dev,
     46						&edma_dmaengine_pcm_config, 0);
     47
     48	config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
     49	if (!config)
     50		return -ENOMEM;
     51
     52	*config = edma_dmaengine_pcm_config;
     53
     54	config->chan_names[0] = "tx";
     55	config->chan_names[1] = "rx";
     56
     57	return devm_snd_dmaengine_pcm_register(dev, config, 0);
     58}
     59EXPORT_SYMBOL_GPL(edma_pcm_platform_register);
     60
     61MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
     62MODULE_DESCRIPTION("eDMA PCM ASoC platform driver");
     63MODULE_LICENSE("GPL");