// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Allwinner SoCs Reset Controller driver
 *
 * Copyright 2013 Maxime Ripard
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/reset/reset-simple.h>
#include <linux/reset/sunxi.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>

static int sunxi_reset_init(struct device_node *np)
{
        struct reset_simple_data *data;
        struct resource res;
        resource_size_t size;
        int ret;

        data = kzalloc_obj(*data);
        if (!data)
                return -ENOMEM;

        ret = of_address_to_resource(np, 0, &res);
        if (ret)
                goto err_alloc;

        size = resource_size(&res);
        if (!request_mem_region(res.start, size, np->name)) {
                ret = -EBUSY;
                goto err_alloc;
        }

        data->membase = ioremap(res.start, size);
        if (!data->membase) {
                ret = -ENOMEM;
                goto err_alloc;
        }

        spin_lock_init(&data->lock);

        data->rcdev.owner = THIS_MODULE;
        data->rcdev.nr_resets = size * 8;
        data->rcdev.ops = &reset_simple_ops;
        data->rcdev.of_node = np;
        data->active_low = true;

        return reset_controller_register(&data->rcdev);

err_alloc:
        kfree(data);
        return ret;
};

/*
 * These are the reset controller we need to initialize early on in
 * our system, before we can even think of using a regular device
 * driver for it.
 * The controllers that we can register through the regular device
 * model are handled by the simple reset driver directly.
 */
static const struct of_device_id sunxi_early_reset_dt_ids[] __initconst = {
        { .compatible = "allwinner,sun6i-a31-ahb1-reset", },
        { /* sentinel */ },
};

void __init sun6i_reset_init(void)
{
        struct device_node *np;

        for_each_matching_node(np, sunxi_early_reset_dt_ids)
                sunxi_reset_init(np);
}