mirror of
https://github.com/torvalds/linux.git
synced 2024-12-02 09:01:34 +00:00
d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Hisilicon SoC reset code
|
|
*
|
|
* Copyright (c) 2014 Hisilicon Ltd.
|
|
* Copyright (c) 2014 Linaro Ltd.
|
|
*
|
|
* Author: Haojian Zhuang <haojian.zhuang@linaro.org>
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reboot.h>
|
|
|
|
#include <asm/proc-fns.h>
|
|
|
|
static void __iomem *base;
|
|
static u32 reboot_offset;
|
|
|
|
static int hisi_restart_handler(struct notifier_block *this,
|
|
unsigned long mode, void *cmd)
|
|
{
|
|
writel_relaxed(0xdeadbeef, base + reboot_offset);
|
|
|
|
while (1)
|
|
cpu_do_idle();
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block hisi_restart_nb = {
|
|
.notifier_call = hisi_restart_handler,
|
|
.priority = 128,
|
|
};
|
|
|
|
static int hisi_reboot_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
int err;
|
|
|
|
base = of_iomap(np, 0);
|
|
if (!base) {
|
|
WARN(1, "failed to map base address");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
|
|
pr_err("failed to find reboot-offset property\n");
|
|
iounmap(base);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = register_restart_handler(&hisi_restart_nb);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
|
|
err);
|
|
iounmap(base);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct of_device_id hisi_reboot_of_match[] = {
|
|
{ .compatible = "hisilicon,sysctrl" },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver hisi_reboot_driver = {
|
|
.probe = hisi_reboot_probe,
|
|
.driver = {
|
|
.name = "hisi-reboot",
|
|
.of_match_table = hisi_reboot_of_match,
|
|
},
|
|
};
|
|
module_platform_driver(hisi_reboot_driver);
|