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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sdma-pcm.c (1959B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  Copyright (C) 2018 Texas Instruments Incorporated - https://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
     15#include "sdma-pcm.h"
     16
     17static const struct snd_pcm_hardware sdma_pcm_hardware = {
     18	.info			= SNDRV_PCM_INFO_MMAP |
     19				  SNDRV_PCM_INFO_MMAP_VALID |
     20				  SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
     21				  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
     22				  SNDRV_PCM_INFO_INTERLEAVED,
     23	.period_bytes_min	= 32,
     24	.period_bytes_max	= 64 * 1024,
     25	.buffer_bytes_max	= 128 * 1024,
     26	.periods_min		= 2,
     27	.periods_max		= 255,
     28};
     29
     30static const struct snd_dmaengine_pcm_config sdma_dmaengine_pcm_config = {
     31	.pcm_hardware = &sdma_pcm_hardware,
     32	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
     33	.prealloc_buffer_size = 128 * 1024,
     34};
     35
     36int sdma_pcm_platform_register(struct device *dev,
     37			       char *txdmachan, char *rxdmachan)
     38{
     39	struct snd_dmaengine_pcm_config *config;
     40	unsigned int flags = 0;
     41
     42	/* Standard names for the directions: 'tx' and 'rx' */
     43	if (!txdmachan && !rxdmachan)
     44		return devm_snd_dmaengine_pcm_register(dev,
     45						&sdma_dmaengine_pcm_config, 0);
     46
     47	config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL);
     48	if (!config)
     49		return -ENOMEM;
     50
     51	*config = sdma_dmaengine_pcm_config;
     52
     53	if (!txdmachan || !rxdmachan) {
     54		/* One direction only PCM */
     55		flags |= SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX;
     56		if (!txdmachan) {
     57			txdmachan = rxdmachan;
     58			rxdmachan = NULL;
     59		}
     60	}
     61
     62	config->chan_names[0] = txdmachan;
     63	config->chan_names[1] = rxdmachan;
     64
     65	return devm_snd_dmaengine_pcm_register(dev, config, flags);
     66}
     67EXPORT_SYMBOL_GPL(sdma_pcm_platform_register);
     68
     69MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
     70MODULE_DESCRIPTION("sDMA PCM ASoC platform driver");
     71MODULE_LICENSE("GPL v2");