projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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"); | |
| 56 | return -EINVAL; | |
| 57 | } | |
| 58 | ||
| 6724534c GR |
59 | err = register_restart_handler(&hisi_restart_nb); |
| 60 | if (err) | |
| 61 | dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n", | |
| 62 | err); | |
| 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); |