117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 MediaTek Inc.
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* Author Freddy Hsin <freddy.hsin@mediatek.com>
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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/of_address.h>
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#include <linux/reboot-mode.h>
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static const struct regmap_config mtk_regmap_config = {
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.reg_bits = 32,
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.val_bits = 32,
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.reg_stride = 4,
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};
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struct mtk_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 mtk_reboot_mode_write(struct reboot_mode_driver *reboot,
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unsigned int magic)
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{
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struct mtk_reboot_mode *mtk_rbm;
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int ret;
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mtk_rbm = container_of(reboot, struct mtk_reboot_mode, reboot);
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ret = regmap_update_bits(mtk_rbm->map, mtk_rbm->offset,
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mtk_rbm->mask, magic);
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if (ret < 0)
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dev_info(reboot->dev, "update reboot mode bits failed\n");
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return ret;
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}
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static int mtk_regmap_lookup_by_phandle(struct device *dev,
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struct mtk_reboot_mode *mtk_rbm)
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{
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struct device_node *toprgu_np;
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struct device_node *np = dev->of_node;
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void __iomem *base;
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toprgu_np = of_parse_phandle(np, "regmap", 0);
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if (!of_device_is_compatible(toprgu_np, "mediatek,toprgu"))
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return -EINVAL;
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base = of_iomap(toprgu_np, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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mtk_rbm->map = devm_regmap_init_mmio(dev, base,
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&mtk_regmap_config);
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return PTR_ERR_OR_ZERO(mtk_rbm->map);
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}
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static int mtk_reboot_mode_probe(struct platform_device *pdev)
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{
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int ret;
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struct mtk_reboot_mode *mtk_rbm;
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mtk_rbm = devm_kzalloc(&pdev->dev, sizeof(*mtk_rbm), GFP_KERNEL);
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if (!mtk_rbm)
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return -ENOMEM;
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mtk_rbm->reboot.dev = &pdev->dev;
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mtk_rbm->reboot.write = mtk_reboot_mode_write;
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mtk_rbm->mask = 0xf;
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ret = mtk_regmap_lookup_by_phandle(&pdev->dev, mtk_rbm);
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if (ret) {
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dev_info(&pdev->dev, "Couldn't create the toprgu regmap\n");
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return -EINVAL;
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}
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if (of_property_read_u32(pdev->dev.of_node, "offset",
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&mtk_rbm->offset))
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return -EINVAL;
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of_property_read_u32(pdev->dev.of_node, "mask", &mtk_rbm->mask);
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ret = devm_reboot_mode_register(&pdev->dev, &mtk_rbm->reboot);
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if (ret)
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dev_info(&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 mtk_reboot_mode_of_match[] = {
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{ .compatible = "toprgu-reboot-mode" },
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{}
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};
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MODULE_DEVICE_TABLE(of, mtk_reboot_mode_of_match);
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static struct platform_driver mtk_reboot_mode_driver = {
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.probe = mtk_reboot_mode_probe,
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.driver = {
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.name = "toprgu-reboot-mode",
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.of_match_table = mtk_reboot_mode_of_match,
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},
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};
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module_platform_driver(mtk_reboot_mode_driver);
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MODULE_AUTHOR("Freddy Hsin <freddy.hsin@mediatek.com>");
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MODULE_DESCRIPTION("Mediatek reboot mode driver");
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MODULE_LICENSE("GPL v2");
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