projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| dd9f1486 JN |
1 | /* |
| 2 | * ZTE zx296702 SoC reset code | |
| 3 | * | |
| 4 | * Copyright (c) 2015 Linaro Ltd. | |
| 5 | * | |
| 6 | * Author: Jun Nie <jun.nie@linaro.org> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/delay.h> | |
| 14 | #include <linux/io.h> | |
| 15 | #include <linux/module.h> | |
| 16 | #include <linux/notifier.h> | |
| 17 | #include <linux/of_address.h> | |
| 18 | #include <linux/platform_device.h> | |
| 19 | #include <linux/reboot.h> | |
| 20 | ||
| dd9f1486 JN |
21 | static void __iomem *base; |
| 22 | static void __iomem *pcu_base; | |
| 23 | ||
| 24 | static int zx_restart_handler(struct notifier_block *this, | |
| 25 | unsigned long mode, void *cmd) | |
| 26 | { | |
| 27 | writel_relaxed(1, base + 0xb0); | |
| 28 | writel_relaxed(1, pcu_base + 0x34); | |
| 29 | ||
| 30 | mdelay(50); | |
| 31 | pr_emerg("Unable to restart system\n"); | |
| 32 | ||
| 33 | return NOTIFY_DONE; | |
| 34 | } | |
| 35 | ||
| 36 | static struct notifier_block zx_restart_nb = { | |
| 37 | .notifier_call = zx_restart_handler, | |
| 38 | .priority = 128, | |
| 39 | }; | |
| 40 | ||
| 41 | static int zx_reboot_probe(struct platform_device *pdev) | |
| 42 | { | |
| 43 | struct device_node *np = pdev->dev.of_node; | |
| 44 | int err; | |
| 45 | ||
| 46 | base = of_iomap(np, 0); | |
| 47 | if (!base) { | |
| 48 | WARN(1, "failed to map base address"); | |
| 49 | return -ENODEV; | |
| 50 | } | |
| 51 | ||
| 52 | np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu"); | |
| 53 | pcu_base = of_iomap(np, 0); | |
| 54 | if (!pcu_base) { | |
| 55 | iounmap(base); | |
| 56 | WARN(1, "failed to map pcu_base address"); | |
| 57 | return -ENODEV; | |
| 58 | } | |
| 59 | ||
| 60 | err = register_restart_handler(&zx_restart_nb); | |
| 61 | if (err) | |
| 62 | dev_err(&pdev->dev, "Register restart handler failed(err=%d)\n", | |
| 63 | err); | |
| 64 | ||
| 65 | return err; | |
| 66 | } | |
| 67 | ||
| 68 | static const struct of_device_id zx_reboot_of_match[] = { | |
| 69 | { .compatible = "zte,sysctrl" }, | |
| 70 | {} | |
| 71 | }; | |
| 72 | ||
| 73 | static struct platform_driver zx_reboot_driver = { | |
| 74 | .probe = zx_reboot_probe, | |
| 75 | .driver = { | |
| 76 | .name = "zx-reboot", | |
| 77 | .of_match_table = zx_reboot_of_match, | |
| 78 | }, | |
| 79 | }; | |
| 80 | module_platform_driver(zx_reboot_driver); |