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86 lines
2.2 KiB
86 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/reboot.h> |
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#include <linux/regmap.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/reboot-mode.h> |
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struct syscon_reboot_mode { |
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struct regmap *map; |
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struct reboot_mode_driver reboot; |
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u32 offset; |
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u32 mask; |
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}; |
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static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, |
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unsigned int magic) |
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{ |
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struct syscon_reboot_mode *syscon_rbm; |
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int ret; |
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syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot); |
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ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset, |
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syscon_rbm->mask, magic); |
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if (ret < 0) |
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dev_err(reboot->dev, "update reboot mode bits failed\n"); |
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return ret; |
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} |
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static int syscon_reboot_mode_probe(struct platform_device *pdev) |
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{ |
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int ret; |
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struct syscon_reboot_mode *syscon_rbm; |
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syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL); |
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if (!syscon_rbm) |
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return -ENOMEM; |
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syscon_rbm->reboot.dev = &pdev->dev; |
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syscon_rbm->reboot.write = syscon_reboot_mode_write; |
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syscon_rbm->mask = 0xffffffff; |
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syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node); |
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if (IS_ERR(syscon_rbm->map)) |
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return PTR_ERR(syscon_rbm->map); |
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if (of_property_read_u32(pdev->dev.of_node, "offset", |
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&syscon_rbm->offset)) |
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return -EINVAL; |
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of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask); |
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ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot); |
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if (ret) |
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dev_err(&pdev->dev, "can't register reboot mode\n"); |
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return ret; |
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} |
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static const struct of_device_id syscon_reboot_mode_of_match[] = { |
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{ .compatible = "syscon-reboot-mode" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, syscon_reboot_mode_of_match); |
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static struct platform_driver syscon_reboot_mode_driver = { |
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.probe = syscon_reboot_mode_probe, |
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.driver = { |
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.name = "syscon-reboot-mode", |
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.of_match_table = syscon_reboot_mode_of_match, |
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}, |
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}; |
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module_platform_driver(syscon_reboot_mode_driver); |
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MODULE_AUTHOR("Andy Yan <[email protected]"); |
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MODULE_DESCRIPTION("SYSCON reboot mode driver"); |
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MODULE_LICENSE("GPL v2");
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