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> | |
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 | ||
24 | static void __iomem *base; | |
25 | static u32 reboot_offset; | |
26 | ||
27 | static 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 | ||
35 | static 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 | ||
55 | static struct of_device_id hisi_reboot_of_match[] = { | |
56 | { .compatible = "hisilicon,sysctrl" }, | |
57 | {} | |
58 | }; | |
59 | ||
60 | static 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 | }; | |
67 | module_platform_driver(hisi_reboot_driver); |