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// 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(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);
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);
}
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