// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * imx-pcm-dma-mx2.c  --  ALSA Soc Audio Layer
 *
 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
 *
 * This code is based on code copyrighted by Freescale,
 * Liam Girdwood, Javier Martin and probably others.
 */
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/types.h>
#include <linux/module.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>

#include "imx-pcm.h"

static bool filter(struct dma_chan *chan, void *param)
{
        if (!imx_dma_is_general_purpose(chan))
                return false;

        chan->private = param;

        return true;
}

static const struct snd_dmaengine_pcm_config imx_dmaengine_pcm_config = {
        .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
        .compat_filter_fn = filter,
};

int imx_pcm_dma_init(struct platform_device *pdev)
{
        struct snd_dmaengine_pcm_config *config;

        config = devm_kzalloc(&pdev->dev,
                        sizeof(struct snd_dmaengine_pcm_config), GFP_KERNEL);
        if (!config)
                return -ENOMEM;
        *config = imx_dmaengine_pcm_config;

        return devm_snd_dmaengine_pcm_register(&pdev->dev,
                config,
                SND_DMAENGINE_PCM_FLAG_COMPAT);
}
EXPORT_SYMBOL_GPL(imx_pcm_dma_init);

MODULE_DESCRIPTION("Freescale i.MX PCM DMA interface");
MODULE_LICENSE("GPL");