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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4a9b3737 HZ |
2 | /* |
3 | * Hisilicon SoC reset code | |
4 | * | |
5 | * Copyright (c) 2014 Hisilicon Ltd. | |
6 | * Copyright (c) 2014 Linaro Ltd. | |
7 | * | |
8 | * Author: Haojian Zhuang <haojian.zhuang@linaro.org> | |
4a9b3737 HZ |
9 | */ |
10 | ||
11 | #include <linux/delay.h> | |
12 | #include <linux/io.h> | |
13 | #include <linux/module.h> | |
6724534c | 14 | #include <linux/notifier.h> |
4a9b3737 HZ |
15 | #include <linux/of_address.h> |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/reboot.h> | |
18 | ||
19 | #include <asm/proc-fns.h> | |
4a9b3737 HZ |
20 | |
21 | static void __iomem *base; | |
22 | static u32 reboot_offset; | |
23 | ||
6724534c GR |
24 | static int hisi_restart_handler(struct notifier_block *this, |
25 | unsigned long mode, void *cmd) | |
4a9b3737 HZ |
26 | { |
27 | writel_relaxed(0xdeadbeef, base + reboot_offset); | |
28 | ||
29 | while (1) | |
30 | cpu_do_idle(); | |
6724534c GR |
31 | |
32 | return NOTIFY_DONE; | |
4a9b3737 HZ |
33 | } |
34 | ||
6724534c GR |
35 | static struct notifier_block hisi_restart_nb = { |
36 | .notifier_call = hisi_restart_handler, | |
37 | .priority = 128, | |
38 | }; | |
39 | ||
4a9b3737 HZ |
40 | static int hisi_reboot_probe(struct platform_device *pdev) |
41 | { | |
42 | struct device_node *np = pdev->dev.of_node; | |
6724534c | 43 | int err; |
4a9b3737 HZ |
44 | |
45 | base = of_iomap(np, 0); | |
46 | if (!base) { | |
47 | WARN(1, "failed to map base address"); | |
48 | return -ENODEV; | |
49 | } | |
50 | ||
51 | if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) { | |
52 | pr_err("failed to find reboot-offset property\n"); | |
bae170ef | 53 | iounmap(base); |
4a9b3737 HZ |
54 | return -EINVAL; |
55 | } | |
56 | ||
6724534c | 57 | err = register_restart_handler(&hisi_restart_nb); |
bae170ef | 58 | if (err) { |
6724534c GR |
59 | dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n", |
60 | err); | |
bae170ef AY |
61 | iounmap(base); |
62 | } | |
4a9b3737 | 63 | |
6724534c | 64 | return err; |
4a9b3737 HZ |
65 | } |
66 | ||
8fb08855 | 67 | static const struct of_device_id hisi_reboot_of_match[] = { |
4a9b3737 HZ |
68 | { .compatible = "hisilicon,sysctrl" }, |
69 | {} | |
70 | }; | |
71 | ||
72 | static struct platform_driver hisi_reboot_driver = { | |
73 | .probe = hisi_reboot_probe, | |
74 | .driver = { | |
75 | .name = "hisi-reboot", | |
76 | .of_match_table = hisi_reboot_of_match, | |
77 | }, | |
78 | }; | |
79 | module_platform_driver(hisi_reboot_driver); |