| Andy Yan | 4fcd504 | 2016-07-06 21:27:26 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | #include <linux/reboot.h> |
| 16 | #include <linux/regmap.h> |
| 17 | #include <linux/mfd/syscon.h> |
| 18 | #include "reboot-mode.h" |
| 19 | |
| 20 | struct syscon_reboot_mode { |
| 21 | struct regmap *map; |
| 22 | struct reboot_mode_driver reboot; |
| 23 | u32 offset; |
| 24 | u32 mask; |
| 25 | }; |
| 26 | |
| 27 | static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, |
| 28 | unsigned int magic) |
| 29 | { |
| 30 | struct syscon_reboot_mode *syscon_rbm; |
| 31 | int ret; |
| 32 | |
| 33 | syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); |
| 34 | |
| 35 | ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, |
| 36 | syscon_rbm->mask, magic); |
| 37 | if (ret < 0) |
| 38 | dev_err(reboot->dev, "update reboot mode bits failed\n"); |
| 39 | |
| 40 | return ret; |
| 41 | } |
| 42 | |
| 43 | static int syscon_reboot_mode_probe(struct platform_device *pdev) |
| 44 | { |
| 45 | int ret; |
| 46 | struct syscon_reboot_mode *syscon_rbm; |
| 47 | |
| 48 | syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); |
| 49 | if (!syscon_rbm) |
| 50 | return -ENOMEM; |
| 51 | |
| 52 | syscon_rbm->reboot.dev = &pdev->dev; |
| 53 | syscon_rbm->reboot.write = syscon_reboot_mode_write; |
| 54 | syscon_rbm->mask = 0xffffffff; |
| 55 | |
| 56 | dev_set_drvdata(&pdev->dev, syscon_rbm); |
| 57 | |
| 58 | syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
| 59 | if (IS_ERR(syscon_rbm->map)) |
| 60 | return PTR_ERR(syscon_rbm->map); |
| 61 | |
| 62 | if (of_property_read_u32(pdev->dev.of_node, "offset", |
| 63 | &syscon_rbm->offset)) |
| 64 | return -EINVAL; |
| 65 | |
| 66 | of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); |
| 67 | |
| 68 | ret = reboot_mode_register(&syscon_rbm->reboot); |
| 69 | if (ret) |
| 70 | dev_err(&pdev->dev, "can't register reboot mode\n"); |
| 71 | |
| 72 | return ret; |
| 73 | } |
| 74 | |
| 75 | static int syscon_reboot_mode_remove(struct platform_device *pdev) |
| 76 | { |
| 77 | struct syscon_reboot_mode *syscon_rbm = dev_get_drvdata(&pdev->dev); |
| 78 | |
| 79 | return reboot_mode_unregister(&syscon_rbm->reboot); |
| 80 | } |
| 81 | |
| 82 | static const struct of_device_id syscon_reboot_mode_of_match[] = { |
| 83 | { .compatible = "syscon-reboot-mode" }, |
| 84 | {} |
| 85 | }; |
| 86 | |
| 87 | static struct platform_driver syscon_reboot_mode_driver = { |
| 88 | .probe = syscon_reboot_mode_probe, |
| 89 | .remove = syscon_reboot_mode_remove, |
| 90 | .driver = { |
| 91 | .name = "syscon-reboot-mode", |
| 92 | .of_match_table = syscon_reboot_mode_of_match, |
| 93 | }, |
| 94 | }; |
| 95 | module_platform_driver(syscon_reboot_mode_driver); |
| 96 | |
| 97 | MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com"); |
| 98 | MODULE_DESCRIPTION("SYSCON reboot mode driver"); |
| 99 | MODULE_LICENSE("GPL v2"); |