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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arm-versatile-reboot.c (4178B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2014 Linaro Ltd.
      4 *
      5 * Author: Linus Walleij <linus.walleij@linaro.org>
      6 */
      7#include <linux/init.h>
      8#include <linux/mfd/syscon.h>
      9#include <linux/reboot.h>
     10#include <linux/regmap.h>
     11#include <linux/of.h>
     12
     13#define INTEGRATOR_HDR_CTRL_OFFSET	0x0C
     14#define INTEGRATOR_HDR_LOCK_OFFSET	0x14
     15#define INTEGRATOR_CM_CTRL_RESET	(1 << 3)
     16
     17#define VERSATILE_SYS_LOCK_OFFSET	0x20
     18#define VERSATILE_SYS_RESETCTL_OFFSET	0x40
     19
     20/* Magic unlocking token used on all Versatile boards */
     21#define VERSATILE_LOCK_VAL		0xA05F
     22
     23/*
     24 * We detect the different syscon types from the compatible strings.
     25 */
     26enum versatile_reboot {
     27	INTEGRATOR_REBOOT_CM,
     28	VERSATILE_REBOOT_CM,
     29	REALVIEW_REBOOT_EB,
     30	REALVIEW_REBOOT_PB1176,
     31	REALVIEW_REBOOT_PB11MP,
     32	REALVIEW_REBOOT_PBA8,
     33	REALVIEW_REBOOT_PBX,
     34};
     35
     36/* Pointer to the system controller */
     37static struct regmap *syscon_regmap;
     38static enum versatile_reboot versatile_reboot_type;
     39
     40static const struct of_device_id versatile_reboot_of_match[] = {
     41	{
     42		.compatible = "arm,core-module-integrator",
     43		.data = (void *)INTEGRATOR_REBOOT_CM
     44	},
     45	{
     46		.compatible = "arm,core-module-versatile",
     47		.data = (void *)VERSATILE_REBOOT_CM,
     48	},
     49	{
     50		.compatible = "arm,realview-eb-syscon",
     51		.data = (void *)REALVIEW_REBOOT_EB,
     52	},
     53	{
     54		.compatible = "arm,realview-pb1176-syscon",
     55		.data = (void *)REALVIEW_REBOOT_PB1176,
     56	},
     57	{
     58		.compatible = "arm,realview-pb11mp-syscon",
     59		.data = (void *)REALVIEW_REBOOT_PB11MP,
     60	},
     61	{
     62		.compatible = "arm,realview-pba8-syscon",
     63		.data = (void *)REALVIEW_REBOOT_PBA8,
     64	},
     65	{
     66		.compatible = "arm,realview-pbx-syscon",
     67		.data = (void *)REALVIEW_REBOOT_PBX,
     68	},
     69	{},
     70};
     71
     72static int versatile_reboot(struct notifier_block *this, unsigned long mode,
     73			    void *cmd)
     74{
     75	/* Unlock the reset register */
     76	/* Then hit reset on the different machines */
     77	switch (versatile_reboot_type) {
     78	case INTEGRATOR_REBOOT_CM:
     79		regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET,
     80			     VERSATILE_LOCK_VAL);
     81		regmap_update_bits(syscon_regmap,
     82				   INTEGRATOR_HDR_CTRL_OFFSET,
     83				   INTEGRATOR_CM_CTRL_RESET,
     84				   INTEGRATOR_CM_CTRL_RESET);
     85		break;
     86	case VERSATILE_REBOOT_CM:
     87		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
     88			     VERSATILE_LOCK_VAL);
     89		regmap_update_bits(syscon_regmap,
     90				   VERSATILE_SYS_RESETCTL_OFFSET,
     91				   0x0107,
     92				   0x0105);
     93		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
     94			     0);
     95		break;
     96	case REALVIEW_REBOOT_EB:
     97		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
     98			     VERSATILE_LOCK_VAL);
     99		regmap_write(syscon_regmap,
    100			     VERSATILE_SYS_RESETCTL_OFFSET, 0x0008);
    101		break;
    102	case REALVIEW_REBOOT_PB1176:
    103		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
    104			     VERSATILE_LOCK_VAL);
    105		regmap_write(syscon_regmap,
    106			     VERSATILE_SYS_RESETCTL_OFFSET, 0x0100);
    107		break;
    108	case REALVIEW_REBOOT_PB11MP:
    109	case REALVIEW_REBOOT_PBA8:
    110		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
    111			     VERSATILE_LOCK_VAL);
    112		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
    113			     0x0000);
    114		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
    115			     0x0004);
    116		break;
    117	case REALVIEW_REBOOT_PBX:
    118		regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
    119			     VERSATILE_LOCK_VAL);
    120		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
    121			     0x00f0);
    122		regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
    123			     0x00f4);
    124		break;
    125	}
    126	dsb();
    127
    128	return NOTIFY_DONE;
    129}
    130
    131static struct notifier_block versatile_reboot_nb = {
    132	.notifier_call = versatile_reboot,
    133	.priority = 192,
    134};
    135
    136static int __init versatile_reboot_probe(void)
    137{
    138	const struct of_device_id *reboot_id;
    139	struct device_node *np;
    140	int err;
    141
    142	np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match,
    143						 &reboot_id);
    144	if (!np)
    145		return -ENODEV;
    146	versatile_reboot_type = (enum versatile_reboot)reboot_id->data;
    147
    148	syscon_regmap = syscon_node_to_regmap(np);
    149	if (IS_ERR(syscon_regmap))
    150		return PTR_ERR(syscon_regmap);
    151
    152	err = register_restart_handler(&versatile_reboot_nb);
    153	if (err)
    154		return err;
    155
    156	pr_info("versatile reboot driver registered\n");
    157	return 0;
    158}
    159device_initcall(versatile_reboot_probe);