// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * OpenFirmware bindings for the MMC-over-SPI driver
 *
 * Copyright (c) MontaVista Software, Inc. 2008.
 *
 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/spi/spi.h>
#include <linux/spi/mmc_spi.h>
#include <linux/mmc/core.h>
#include <linux/mmc/host.h>

MODULE_DESCRIPTION("OpenFirmware bindings for the MMC-over-SPI driver");
MODULE_LICENSE("GPL");

struct of_mmc_spi {
        struct mmc_spi_platform_data pdata;
        int detect_irq;
};

static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
{
        return container_of(dev->platform_data, struct of_mmc_spi, pdata);
}

static int of_mmc_spi_init(struct device *dev,
                           irqreturn_t (*irqhandler)(int, void *), void *mmc)
{
        struct of_mmc_spi *oms = to_of_mmc_spi(dev);

        return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
                                        IRQF_ONESHOT, dev_name(dev), mmc);
}

static void of_mmc_spi_exit(struct device *dev, void *mmc)
{
        struct of_mmc_spi *oms = to_of_mmc_spi(dev);

        free_irq(oms->detect_irq, mmc);
}

struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
{
        struct mmc_host *mmc = dev_get_drvdata(&spi->dev);
        struct device *dev = &spi->dev;
        struct of_mmc_spi *oms;

        if (dev->platform_data || !dev_fwnode(dev))
                return dev->platform_data;

        oms = kzalloc_obj(*oms);
        if (!oms)
                return NULL;

        if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0)
                goto err_ocr;

        oms->detect_irq = spi->irq;
        if (oms->detect_irq > 0) {
                oms->pdata.init = of_mmc_spi_init;
                oms->pdata.exit = of_mmc_spi_exit;
        } else {
                oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
        }
        if (device_property_read_bool(dev, "cap-sd-highspeed"))
                oms->pdata.caps |= MMC_CAP_SD_HIGHSPEED;
        if (device_property_read_bool(dev, "cap-mmc-highspeed"))
                oms->pdata.caps |= MMC_CAP_MMC_HIGHSPEED;

        dev->platform_data = &oms->pdata;
        return dev->platform_data;
err_ocr:
        kfree(oms);
        return NULL;
}
EXPORT_SYMBOL(mmc_spi_get_pdata);

void mmc_spi_put_pdata(struct spi_device *spi)
{
        struct device *dev = &spi->dev;
        struct of_mmc_spi *oms = to_of_mmc_spi(dev);

        if (!dev->platform_data || !dev_fwnode(dev))
                return;

        kfree(oms);
        dev->platform_data = NULL;
}
EXPORT_SYMBOL(mmc_spi_put_pdata);