linux-stable/drivers/power/reset/hisi-reboot.c
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
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>
2019-06-19 17:09:55 +02:00

79 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);