// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Hisilicon SoC reset code
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*
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* Copyright (c) 2014 Hisilicon Ltd.
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* Copyright (c) 2014 Linaro Ltd.
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*
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* Author: Haojian Zhuang <haojian.zhuang@linaro.org>
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <asm/proc-fns.h>
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static void __iomem *base;
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static u32 reboot_offset;
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static int hisi_restart_handler(struct notifier_block *this,
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unsigned long mode, void *cmd)
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{
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writel_relaxed(0xdeadbeef, base + reboot_offset);
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while (1)
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cpu_do_idle();
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return NOTIFY_DONE;
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}
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static struct notifier_block hisi_restart_nb = {
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.notifier_call = hisi_restart_handler,
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.priority = 128,
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};
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static int hisi_reboot_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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int err;
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base = of_iomap(np, 0);
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if (!base) {
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WARN(1, "failed to map base address");
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return -ENODEV;
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}
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if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
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pr_err("failed to find reboot-offset property\n");
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iounmap(base);
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return -EINVAL;
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}
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err = register_restart_handler(&hisi_restart_nb);
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if (err) {
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dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
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err);
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iounmap(base);
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}
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return err;
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}
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static const struct of_device_id hisi_reboot_of_match[] = {
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{ .compatible = "hisilicon,sysctrl" },
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{}
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};
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static struct platform_driver hisi_reboot_driver = {
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.probe = hisi_reboot_probe,
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.driver = {
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.name = "hisi-reboot",
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.of_match_table = hisi_reboot_of_match,
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},
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};
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module_platform_driver(hisi_reboot_driver);
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