projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 4a9b3737 | 2 | /* |
| 9f45275a | 3 | * HiSilicon SoC reset code |
| 4a9b3737 | 4 | * |
| 9f45275a | 5 | * Copyright (c) 2014 HiSilicon Ltd. |
| 4a9b3737 HZ |
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 | }; | |
| 2d54a222 | 71 | MODULE_DEVICE_TABLE(of, hisi_reboot_of_match); |
| 4a9b3737 HZ |
72 | |
| 73 | static struct platform_driver hisi_reboot_driver = { | |
| 74 | .probe = hisi_reboot_probe, | |
| 75 | .driver = { | |
| 76 | .name = "hisi-reboot", | |
| 77 | .of_match_table = hisi_reboot_of_match, | |
| 78 | }, | |
| 79 | }; | |
| 80 | module_platform_driver(hisi_reboot_driver); |