Commit | Line | Data |
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4a9b3737 HZ |
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> | |
6724534c | 17 | #include <linux/notifier.h> |
4a9b3737 HZ |
18 | #include <linux/of_address.h> |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/reboot.h> | |
21 | ||
22 | #include <asm/proc-fns.h> | |
4a9b3737 HZ |
23 | |
24 | static void __iomem *base; | |
25 | static u32 reboot_offset; | |
26 | ||
6724534c GR |
27 | static int hisi_restart_handler(struct notifier_block *this, |
28 | unsigned long mode, void *cmd) | |
4a9b3737 HZ |
29 | { |
30 | writel_relaxed(0xdeadbeef, base + reboot_offset); | |
31 | ||
32 | while (1) | |
33 | cpu_do_idle(); | |
6724534c GR |
34 | |
35 | return NOTIFY_DONE; | |
4a9b3737 HZ |
36 | } |
37 | ||
6724534c GR |
38 | static struct notifier_block hisi_restart_nb = { |
39 | .notifier_call = hisi_restart_handler, | |
40 | .priority = 128, | |
41 | }; | |
42 | ||
4a9b3737 HZ |
43 | static int hisi_reboot_probe(struct platform_device *pdev) |
44 | { | |
45 | struct device_node *np = pdev->dev.of_node; | |
6724534c | 46 | int err; |
4a9b3737 HZ |
47 | |
48 | base = of_iomap(np, 0); | |
49 | if (!base) { | |
50 | WARN(1, "failed to map base address"); | |
51 | return -ENODEV; | |
52 | } | |
53 | ||
54 | if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) { | |
55 | pr_err("failed to find reboot-offset property\n"); | |
bae170ef | 56 | iounmap(base); |
4a9b3737 HZ |
57 | return -EINVAL; |
58 | } | |
59 | ||
6724534c | 60 | err = register_restart_handler(&hisi_restart_nb); |
bae170ef | 61 | if (err) { |
6724534c GR |
62 | dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n", |
63 | err); | |
bae170ef AY |
64 | iounmap(base); |
65 | } | |
4a9b3737 | 66 | |
6724534c | 67 | return err; |
4a9b3737 HZ |
68 | } |
69 | ||
8fb08855 | 70 | static const struct of_device_id hisi_reboot_of_match[] = { |
4a9b3737 HZ |
71 | { .compatible = "hisilicon,sysctrl" }, |
72 | {} | |
73 | }; | |
74 | ||
75 | static struct platform_driver hisi_reboot_driver = { | |
76 | .probe = hisi_reboot_probe, | |
77 | .driver = { | |
78 | .name = "hisi-reboot", | |
79 | .of_match_table = hisi_reboot_of_match, | |
80 | }, | |
81 | }; | |
82 | module_platform_driver(hisi_reboot_driver); |