cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hisi-reboot.c (1722B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * HiSilicon SoC reset code
      4 *
      5 * Copyright (c) 2014 HiSilicon Ltd.
      6 * Copyright (c) 2014 Linaro Ltd.
      7 *
      8 * Author: Haojian Zhuang <haojian.zhuang@linaro.org>
      9 */
     10
     11#include <linux/delay.h>
     12#include <linux/io.h>
     13#include <linux/module.h>
     14#include <linux/notifier.h>
     15#include <linux/of_address.h>
     16#include <linux/platform_device.h>
     17#include <linux/reboot.h>
     18
     19#include <asm/proc-fns.h>
     20
     21static void __iomem *base;
     22static u32 reboot_offset;
     23
     24static int hisi_restart_handler(struct notifier_block *this,
     25				unsigned long mode, void *cmd)
     26{
     27	writel_relaxed(0xdeadbeef, base + reboot_offset);
     28
     29	while (1)
     30		cpu_do_idle();
     31
     32	return NOTIFY_DONE;
     33}
     34
     35static struct notifier_block hisi_restart_nb = {
     36	.notifier_call = hisi_restart_handler,
     37	.priority = 128,
     38};
     39
     40static int hisi_reboot_probe(struct platform_device *pdev)
     41{
     42	struct device_node *np = pdev->dev.of_node;
     43	int err;
     44
     45	base = of_iomap(np, 0);
     46	if (!base) {
     47		WARN(1, "failed to map base address");
     48		return -ENODEV;
     49	}
     50
     51	if (of_property_read_u32(np, "reboot-offset", &reboot_offset) < 0) {
     52		pr_err("failed to find reboot-offset property\n");
     53		iounmap(base);
     54		return -EINVAL;
     55	}
     56
     57	err = register_restart_handler(&hisi_restart_nb);
     58	if (err) {
     59		dev_err(&pdev->dev, "cannot register restart handler (err=%d)\n",
     60			err);
     61		iounmap(base);
     62	}
     63
     64	return err;
     65}
     66
     67static const struct of_device_id hisi_reboot_of_match[] = {
     68	{ .compatible = "hisilicon,sysctrl" },
     69	{}
     70};
     71MODULE_DEVICE_TABLE(of, hisi_reboot_of_match);
     72
     73static struct platform_driver hisi_reboot_driver = {
     74	.probe = hisi_reboot_probe,
     75	.driver = {
     76		.name = "hisi-reboot",
     77		.of_match_table = hisi_reboot_of_match,
     78	},
     79};
     80module_platform_driver(hisi_reboot_driver);