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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rmobile-reset.c (2012B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Renesas R-Mobile Reset Driver
      4 *
      5 * Copyright (C) 2014 Glider bvba
      6 */
      7
      8#include <linux/io.h>
      9#include <linux/module.h>
     10#include <linux/notifier.h>
     11#include <linux/of_address.h>
     12#include <linux/platform_device.h>
     13#include <linux/printk.h>
     14#include <linux/reboot.h>
     15
     16/* SYSC Register Bank 2 */
     17#define RESCNT2		0x20		/* Reset Control Register 2 */
     18
     19/* Reset Control Register 2 */
     20#define RESCNT2_PRES	0x80000000	/* Soft power-on reset */
     21
     22static void __iomem *sysc_base2;
     23
     24static int rmobile_reset_handler(struct notifier_block *this,
     25				 unsigned long mode, void *cmd)
     26{
     27	pr_debug("%s %lu\n", __func__, mode);
     28
     29	/* Let's assume we have acquired the HPB semaphore */
     30	writel(RESCNT2_PRES, sysc_base2 + RESCNT2);
     31
     32	return NOTIFY_DONE;
     33}
     34
     35static struct notifier_block rmobile_reset_nb = {
     36	.notifier_call = rmobile_reset_handler,
     37	.priority = 192,
     38};
     39
     40static int rmobile_reset_probe(struct platform_device *pdev)
     41{
     42	int error;
     43
     44	sysc_base2 = of_iomap(pdev->dev.of_node, 1);
     45	if (!sysc_base2)
     46		return -ENODEV;
     47
     48	error = register_restart_handler(&rmobile_reset_nb);
     49	if (error) {
     50		dev_err(&pdev->dev,
     51			"cannot register restart handler (err=%d)\n", error);
     52		goto fail_unmap;
     53	}
     54
     55	return 0;
     56
     57fail_unmap:
     58	iounmap(sysc_base2);
     59	return error;
     60}
     61
     62static int rmobile_reset_remove(struct platform_device *pdev)
     63{
     64	unregister_restart_handler(&rmobile_reset_nb);
     65	iounmap(sysc_base2);
     66	return 0;
     67}
     68
     69static const struct of_device_id rmobile_reset_of_match[] = {
     70	{ .compatible = "renesas,sysc-rmobile", },
     71	{ /* sentinel */ }
     72};
     73MODULE_DEVICE_TABLE(of, rmobile_reset_of_match);
     74
     75static struct platform_driver rmobile_reset_driver = {
     76	.probe = rmobile_reset_probe,
     77	.remove = rmobile_reset_remove,
     78	.driver = {
     79		.name = "rmobile_reset",
     80		.of_match_table = rmobile_reset_of_match,
     81	},
     82};
     83
     84module_platform_driver(rmobile_reset_driver);
     85
     86MODULE_DESCRIPTION("Renesas R-Mobile Reset Driver");
     87MODULE_AUTHOR("Geert Uytterhoeven <geert+renesas@glider.be>");
     88MODULE_LICENSE("GPL v2");