linux-imx

/*

 * Allwinner SoCs Reset Controller driver

 *

 * Copyright 2013 Maxime Ripard

 *

 * Maxime Ripard <maxime.ripard@free-electrons.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

​

#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/sunxi.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/types.h>

​

#include "reset-simple.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(sizeof(*data), GFP_KERNEL);

    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);