// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ZTE zx296702 SoC reset code
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*
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* Copyright (c) 2015 Linaro Ltd.
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*
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* Author: Jun Nie <jun.nie@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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static void __iomem *base;
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static void __iomem *pcu_base;
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static int zx_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(1, base + 0xb0);
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writel_relaxed(1, pcu_base + 0x34);
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mdelay(50);
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pr_emerg("Unable to restart system\n");
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return NOTIFY_DONE;
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}
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static struct notifier_block zx_restart_nb = {
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.notifier_call = zx_restart_handler,
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.priority = 128,
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};
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static int zx_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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np = of_find_compatible_node(NULL, NULL, "zte,zx296702-pcu");
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pcu_base = of_iomap(np, 0);
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of_node_put(np);
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if (!pcu_base) {
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iounmap(base);
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WARN(1, "failed to map pcu_base address");
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return -ENODEV;
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}
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err = register_restart_handler(&zx_restart_nb);
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if (err) {
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iounmap(base);
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iounmap(pcu_base);
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dev_err(&pdev->dev, "Register restart handler failed(err=%d)\n",
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err);
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}
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return err;
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}
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static const struct of_device_id zx_reboot_of_match[] = {
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{ .compatible = "zte,sysctrl" },
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{}
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};
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MODULE_DEVICE_TABLE(of, zx_reboot_of_match);
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static struct platform_driver zx_reboot_driver = {
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.probe = zx_reboot_probe,
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.driver = {
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.name = "zx-reboot",
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.of_match_table = zx_reboot_of_match,
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},
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};
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module_platform_driver(zx_reboot_driver);
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MODULE_DESCRIPTION("ZTE SoCs reset driver");
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MODULE_AUTHOR("Jun Nie <jun.nie@linaro.org>");
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MODULE_LICENSE("GPL v2");
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