1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Allwinner SoCs Reset Controller driver
 4 *
 5 * Copyright 2013 Maxime Ripard
 6 *
 7 * Maxime Ripard <maxime.ripard@free-electrons.com>
 8 */
 9
10#include <linux/err.h>
11#include <linux/io.h>
12#include <linux/init.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/platform_device.h>
16#include <linux/reset-controller.h>
17#include <linux/reset/reset-simple.h>
18#include <linux/reset/sunxi.h>
19#include <linux/slab.h>
20#include <linux/spinlock.h>
21#include <linux/types.h>
22
23static int sunxi_reset_init(struct device_node *np)
24{
25	struct reset_simple_data *data;
26	struct resource res;
27	resource_size_t size;
28	int ret;
29
30	data = kzalloc(sizeof(*data), GFP_KERNEL);
31	if (!data)
32		return -ENOMEM;
33
34	ret = of_address_to_resource(np, 0, &res);
35	if (ret)
36		goto err_alloc;
37
38	size = resource_size(&res);
39	if (!request_mem_region(res.start, size, np->name)) {
40		ret = -EBUSY;
41		goto err_alloc;
42	}
43
44	data->membase = ioremap(res.start, size);
45	if (!data->membase) {
46		ret = -ENOMEM;
47		goto err_alloc;
48	}
49
50	spin_lock_init(&data->lock);
51
52	data->rcdev.owner = THIS_MODULE;
53	data->rcdev.nr_resets = size * 8;
54	data->rcdev.ops = &reset_simple_ops;
55	data->rcdev.of_node = np;
56	data->active_low = true;
57
58	return reset_controller_register(&data->rcdev);
59
60err_alloc:
61	kfree(data);
62	return ret;
63};
64
65/*
66 * These are the reset controller we need to initialize early on in
67 * our system, before we can even think of using a regular device
68 * driver for it.
69 * The controllers that we can register through the regular device
70 * model are handled by the simple reset driver directly.
71 */
72static const struct of_device_id sunxi_early_reset_dt_ids[] __initconst = {
73	{ .compatible = "allwinner,sun6i-a31-ahb1-reset", },
74	{ /* sentinel */ },
75};
76
77void __init sun6i_reset_init(void)
78{
79	struct device_node *np;
80
81	for_each_matching_node(np, sunxi_early_reset_dt_ids)
82		sunxi_reset_init(np);
83}

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Allwinner SoCs Reset Controller driver
 4 *
 5 * Copyright 2013 Maxime Ripard
 6 *
 7 * Maxime Ripard <maxime.ripard@free-electrons.com>
 8 */
 9
10#include <linux/err.h>
11#include <linux/io.h>
12#include <linux/init.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/platform_device.h>
16#include <linux/reset-controller.h>
17#include <linux/reset/reset-simple.h>
18#include <linux/reset/sunxi.h>
19#include <linux/slab.h>
20#include <linux/spinlock.h>
21#include <linux/types.h>
22
23static int sunxi_reset_init(struct device_node *np)
24{
25	struct reset_simple_data *data;
26	struct resource res;
27	resource_size_t size;
28	int ret;
29
30	data = kzalloc(sizeof(*data), GFP_KERNEL);
31	if (!data)
32		return -ENOMEM;
33
34	ret = of_address_to_resource(np, 0, &res);
35	if (ret)
36		goto err_alloc;
37
38	size = resource_size(&res);
39	if (!request_mem_region(res.start, size, np->name)) {
40		ret = -EBUSY;
41		goto err_alloc;
42	}
43
44	data->membase = ioremap(res.start, size);
45	if (!data->membase) {
46		ret = -ENOMEM;
47		goto err_alloc;
48	}
49
50	spin_lock_init(&data->lock);
51
52	data->rcdev.owner = THIS_MODULE;
53	data->rcdev.nr_resets = size * 8;
54	data->rcdev.ops = &reset_simple_ops;
55	data->rcdev.of_node = np;
56	data->active_low = true;
57
58	return reset_controller_register(&data->rcdev);
59
60err_alloc:
61	kfree(data);
62	return ret;
63};
64
65/*
66 * These are the reset controller we need to initialize early on in
67 * our system, before we can even think of using a regular device
68 * driver for it.
69 * The controllers that we can register through the regular device
70 * model are handled by the simple reset driver directly.
71 */
72static const struct of_device_id sunxi_early_reset_dt_ids[] __initconst = {
73	{ .compatible = "allwinner,sun6i-a31-ahb1-reset", },
74	{ /* sentinel */ },
75};
76
77void __init sun6i_reset_init(void)
78{
79	struct device_node *np;
80
81	for_each_matching_node(np, sunxi_early_reset_dt_ids)
82		sunxi_reset_init(np);
83}