99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
// 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_read(struct reboot_mode_driver *reboot)
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{
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struct syscon_reboot_mode *syscon_rbm;
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u32 val = 0;
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syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
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regmap_read(syscon_rbm->map, syscon_rbm->offset, &val);
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return val;
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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->reboot.read = syscon_reboot_mode_read;
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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 <andy.yan@rock-chips.com");
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MODULE_DESCRIPTION("SYSCON reboot mode driver");
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MODULE_LICENSE("GPL v2");
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