1/*
2 * Hisilicon SoC reset code
3 *
4 * Copyright (c) 2014 Hisilicon Ltd.
5 * Copyright (c) 2014 Linaro Ltd.
6 *
7 * Author: Haojian Zhuang <haojian.zhuang@linaro.org>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/delay.h>
15#include <linux/io.h>
16#include <linux/module.h>
17#include <linux/of_address.h>
18#include <linux/platform_device.h>
19#include <linux/reboot.h>
20
21#include <asm/proc-fns.h>
22#include <asm/system_misc.h>
23
24static void __iomem *base;
25static u32 reboot_offset;
26
27static void hisi_restart(enum reboot_mode mode, const char *cmd)
28{
29	writel_relaxed(0xdeadbeef, base + reboot_offset);
30
31	while (1)
32		cpu_do_idle();
33}
34
35static int hisi_reboot_probe(struct platform_device *pdev)
36{
37	struct device_node *np = pdev->dev.of_node;
38
39	base = of_iomap(np, 0);
40	if (!base) {
41		WARN(1, "failed to map base address");
42		return -ENODEV;
43	}
44
45	if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
46		pr_err("failed to find reboot-offset property\n");
47		return -EINVAL;
48	}
49
50	arm_pm_restart = hisi_restart;
51
52	return 0;
53}
54
55static struct of_device_id hisi_reboot_of_match[] = {
56	{ .compatible = "hisilicon,sysctrl" },
57	{}
58};
59
60static struct platform_driver hisi_reboot_driver = {
61	.probe = hisi_reboot_probe,
62	.driver = {
63		.name = "hisi-reboot",
64		.of_match_table = hisi_reboot_of_match,
65	},
66};
67module_platform_driver(hisi_reboot_driver);
68