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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2014 Linaro Ltd.
*
* Author: Linus Walleij <linus.walleij@linaro.org>
*/
#include <linux/init.h>
#include <linux/mfd/syscon.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/of.h>
#define INTEGRATOR_HDR_CTRL_OFFSET 0x0C
#define INTEGRATOR_HDR_LOCK_OFFSET 0x14
#define INTEGRATOR_CM_CTRL_RESET (1 << 3)
#define VERSATILE_SYS_LOCK_OFFSET 0x20
#define VERSATILE_SYS_RESETCTL_OFFSET 0x40
/* Magic unlocking token used on all Versatile boards */
#define VERSATILE_LOCK_VAL 0xA05F
/*
* We detect the different syscon types from the compatible strings.
*/
enum versatile_reboot {
INTEGRATOR_REBOOT_CM,
VERSATILE_REBOOT_CM,
REALVIEW_REBOOT_EB,
REALVIEW_REBOOT_PB1176,
REALVIEW_REBOOT_PB11MP,
REALVIEW_REBOOT_PBA8,
REALVIEW_REBOOT_PBX,
};
/* Pointer to the system controller */
static struct regmap *syscon_regmap;
static enum versatile_reboot versatile_reboot_type;
static const struct of_device_id versatile_reboot_of_match[] = {
{
.compatible = "arm,core-module-integrator",
.data = (void *)INTEGRATOR_REBOOT_CM
},
{
.compatible = "arm,core-module-versatile",
.data = (void *)VERSATILE_REBOOT_CM,
},
{
.compatible = "arm,realview-eb-syscon",
.data = (void *)REALVIEW_REBOOT_EB,
},
{
.compatible = "arm,realview-pb1176-syscon",
.data = (void *)REALVIEW_REBOOT_PB1176,
},
{
.compatible = "arm,realview-pb11mp-syscon",
.data = (void *)REALVIEW_REBOOT_PB11MP,
},
{
.compatible = "arm,realview-pba8-syscon",
.data = (void *)REALVIEW_REBOOT_PBA8,
},
{
.compatible = "arm,realview-pbx-syscon",
.data = (void *)REALVIEW_REBOOT_PBX,
},
{},
};
static int versatile_reboot(struct notifier_block *this, unsigned long mode,
void *cmd)
{
/* Unlock the reset register */
/* Then hit reset on the different machines */
switch (versatile_reboot_type) {
case INTEGRATOR_REBOOT_CM:
regmap_write(syscon_regmap, INTEGRATOR_HDR_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_update_bits(syscon_regmap,
INTEGRATOR_HDR_CTRL_OFFSET,
INTEGRATOR_CM_CTRL_RESET,
INTEGRATOR_CM_CTRL_RESET);
break;
case VERSATILE_REBOOT_CM:
regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_update_bits(syscon_regmap,
VERSATILE_SYS_RESETCTL_OFFSET,
0x0107,
0x0105);
regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
0);
break;
case REALVIEW_REBOOT_EB:
regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_write(syscon_regmap,
VERSATILE_SYS_RESETCTL_OFFSET, 0x0008);
break;
case REALVIEW_REBOOT_PB1176:
regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_write(syscon_regmap,
VERSATILE_SYS_RESETCTL_OFFSET, 0x0100);
break;
case REALVIEW_REBOOT_PB11MP:
case REALVIEW_REBOOT_PBA8:
regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0x0000);
regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0x0004);
break;
case REALVIEW_REBOOT_PBX:
regmap_write(syscon_regmap, VERSATILE_SYS_LOCK_OFFSET,
VERSATILE_LOCK_VAL);
regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0x00f0);
regmap_write(syscon_regmap, VERSATILE_SYS_RESETCTL_OFFSET,
0x00f4);
break;
}
dsb();
return NOTIFY_DONE;
}
static struct notifier_block versatile_reboot_nb = {
.notifier_call = versatile_reboot,
.priority = 192,
};
static int __init versatile_reboot_probe(void)
{
const struct of_device_id *reboot_id;
struct device_node *np;
int err;
np = of_find_matching_node_and_match(NULL, versatile_reboot_of_match,
&reboot_id);
if (!np)
return -ENODEV;
versatile_reboot_type = (enum versatile_reboot)reboot_id->data;
syscon_regmap = syscon_node_to_regmap(np);
of_node_put(np);
if (IS_ERR(syscon_regmap))
return PTR_ERR(syscon_regmap);
err = register_restart_handler(&versatile_reboot_nb);
if (err)
return err;
pr_info("versatile reboot driver registered\n");
return 0;
}
device_initcall(versatile_reboot_probe);
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