projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 4fcd504e AY |
2 | /* |
| 3 | * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd | |
| 4fcd504e AY |
4 | */ |
| 5 | ||
| 6 | #include <linux/init.h> | |
| 7 | #include <linux/module.h> | |
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/of.h> | |
| 10 | #include <linux/platform_device.h> | |
| 11 | #include <linux/reboot.h> | |
| 12 | #include <linux/regmap.h> | |
| 13 | #include <linux/mfd/syscon.h> | |
| f1bea879 | 14 | #include <linux/reboot-mode.h> |
| 4fcd504e AY |
15 | |
| 16 | struct syscon_reboot_mode { | |
| 17 | struct regmap *map; | |
| 18 | struct reboot_mode_driver reboot; | |
| 19 | u32 offset; | |
| 20 | u32 mask; | |
| 21 | }; | |
| 22 | ||
| 23 | static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, | |
| 24 | unsigned int magic) | |
| 25 | { | |
| 26 | struct syscon_reboot_mode *syscon_rbm; | |
| 27 | int ret; | |
| 28 | ||
| 29 | syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); | |
| 30 | ||
| 31 | ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, | |
| 32 | syscon_rbm->mask, magic); | |
| 33 | if (ret < 0) | |
| 34 | dev_err(reboot->dev, "update reboot mode bits failed\n"); | |
| 35 | ||
| 36 | return ret; | |
| 37 | } | |
| 38 | ||
| 39 | static int syscon_reboot_mode_probe(struct platform_device *pdev) | |
| 40 | { | |
| 41 | int ret; | |
| 42 | struct syscon_reboot_mode *syscon_rbm; | |
| 43 | ||
| 44 | syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); | |
| 45 | if (!syscon_rbm) | |
| 46 | return -ENOMEM; | |
| 47 | ||
| 48 | syscon_rbm->reboot.dev = &pdev->dev; | |
| 49 | syscon_rbm->reboot.write = syscon_reboot_mode_write; | |
| 50 | syscon_rbm->mask = 0xffffffff; | |
| 51 | ||
| 4fcd504e AY |
52 | syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
| 53 | if (IS_ERR(syscon_rbm->map)) | |
| 54 | return PTR_ERR(syscon_rbm->map); | |
| 55 | ||
| 56 | if (of_property_read_u32(pdev->dev.of_node, "offset", | |
| 57 | &syscon_rbm->offset)) | |
| 58 | return -EINVAL; | |
| 59 | ||
| 60 | of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); | |
| 61 | ||
| 8dfdd2a8 | 62 | ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot); |
| 4fcd504e AY |
63 | if (ret) |
| 64 | dev_err(&pdev->dev, "can't register reboot mode\n"); | |
| 65 | ||
| 66 | return ret; | |
| 67 | } | |
| 68 | ||
| 4fcd504e AY |
69 | static const struct of_device_id syscon_reboot_mode_of_match[] = { |
| 70 | { .compatible = "syscon-reboot-mode" }, | |
| 71 | {} | |
| 72 | }; | |
| 0a27aa9c | 73 | MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match); |
| 4fcd504e AY |
74 | |
| 75 | static struct platform_driver syscon_reboot_mode_driver = { | |
| 76 | .probe = syscon_reboot_mode_probe, | |
| 4fcd504e AY |
77 | .driver = { |
| 78 | .name = "syscon-reboot-mode", | |
| 79 | .of_match_table = syscon_reboot_mode_of_match, | |
| 80 | }, | |
| 81 | }; | |
| 82 | module_platform_driver(syscon_reboot_mode_driver); | |
| 83 | ||
| 84 | MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); | |
| 85 | MODULE_DESCRIPTION("SYSCON reboot mode driver"); | |
| 86 | MODULE_LICENSE("GPL v2"); |