// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) ST-Ericsson SA 2012
 *
 * Author: Ola Lilja <ola.o.lilja@stericsson.com>,
 *         Roger Nilsson <roger.xr.nilsson@stericsson.com>
 *         for ST-Ericsson.
 */

#include <asm/page.h>

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/slab.h>

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

#include "ux500_msp_i2s.h"
#include "ux500_pcm.h"

#define UX500_PLATFORM_PERIODS_BYTES_MIN        128
#define UX500_PLATFORM_PERIODS_BYTES_MAX        (64 * PAGE_SIZE)
#define UX500_PLATFORM_PERIODS_MIN              2
#define UX500_PLATFORM_PERIODS_MAX              48
#define UX500_PLATFORM_BUFFER_BYTES_MAX         (2048 * PAGE_SIZE)

static int ux500_pcm_prepare_slave_config(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params,
                struct dma_slave_config *slave_config)
{
        struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
        struct snd_dmaengine_dai_dma_data *snd_dma_params;
        dma_addr_t dma_addr;
        int ret;

        snd_dma_params = snd_soc_dai_get_dma_data(snd_soc_rtd_to_cpu(rtd, 0), substream);
        dma_addr = snd_dma_params->addr;

        ret = snd_hwparams_to_dma_slave_config(substream, params, slave_config);
        if (ret)
                return ret;

        slave_config->dst_maxburst = 4;
        slave_config->src_maxburst = 4;

        slave_config->src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
        slave_config->dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;

        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                slave_config->dst_addr = dma_addr;
        else
                slave_config->src_addr = dma_addr;

        return 0;
}

static const struct snd_dmaengine_pcm_config ux500_dmaengine_of_pcm_config = {
        .prepare_slave_config = ux500_pcm_prepare_slave_config,
};

int ux500_pcm_register_platform(struct platform_device *pdev)
{
        int ret;

        ret = snd_dmaengine_pcm_register(&pdev->dev,
                                         &ux500_dmaengine_of_pcm_config, 0);
        if (ret < 0) {
                dev_err(&pdev->dev,
                        "%s: ERROR: Failed to register platform '%s' (%d)!\n",
                        __func__, pdev->name, ret);
                return ret;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_register_platform);

int ux500_pcm_unregister_platform(struct platform_device *pdev)
{
        snd_dmaengine_pcm_unregister(&pdev->dev);
        return 0;
}
EXPORT_SYMBOL_GPL(ux500_pcm_unregister_platform);

MODULE_AUTHOR("Ola Lilja");
MODULE_AUTHOR("Roger Nilsson");
MODULE_DESCRIPTION("ASoC UX500 driver");
MODULE_LICENSE("GPL v2");