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// SPDX-License-Identifier: GPL-2.0-only
/*
* exynos-reboot.c - Samsung Exynos SoC reset code
*
* Copyright (c) 2019-2021 Samsung Electronics Co., Ltd.
*
* Author: Hyunki Koo <hyunki00.koo@samsung.com>
* Youngmin Nam <youngmin.nam@samsung.com>
*/
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/samsung/s2mpg12.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <soc/google/exynos-el3_mon.h>
#include "../../bms/google_bms.h"
#define EXYNOS_PMU_SYSIP_DAT0 (0x0810)
#define BMS_RSBM_VALID BIT(31)
static u32 reboot_cmd_offset;
static phys_addr_t pmu_alive_base;
static bool force_warm_reboot_on_thermal_shutdown;
enum pon_reboot_mode {
REBOOT_MODE_NORMAL = 0x00,
REBOOT_MODE_CHARGE = 0x0A,
REBOOT_MODE_DMVERITY_CORRUPTED = 0x50,
REBOOT_MODE_SHUTDOWN_THERMAL = 0x51,
REBOOT_MODE_AB_UPDATE = 0x52,
REBOOT_MODE_RESCUE = 0xF9,
REBOOT_MODE_FASTBOOT = 0xFA,
REBOOT_MODE_BOOTLOADER = 0xFC,
REBOOT_MODE_FACTORY = 0xFD,
REBOOT_MODE_RECOVERY = 0xFF,
};
static void exynos_reboot_mode_set(u32 val)
{
int ret;
phys_addr_t reboot_cmd_addr = pmu_alive_base + reboot_cmd_offset;
u32 mode;
ret = set_priv_reg(reboot_cmd_addr, val);
if (ret) {
pr_info("%s(): failed to set addr %pap via set_priv_reg, using regmap\n",
__func__, &reboot_cmd_addr);
}
mode = val | BMS_RSBM_VALID;
ret = gbms_storage_write(GBMS_TAG_RSBM, &mode, sizeof(mode));
if (ret < 0)
pr_err("%s(): failed to write gbms storage: %d(%d)\n", __func__,
GBMS_TAG_RSBM, ret);
}
static void exynos_reboot_parse(const char *cmd)
{
if (cmd) {
u32 value = U32_MAX;
bool force_warm_reboot = false;
pr_info("Reboot command: '%s'\n", cmd);
if (!strcmp(cmd, "charge")) {
value = REBOOT_MODE_CHARGE;
} else if (!strcmp(cmd, "bootloader")) {
value = REBOOT_MODE_BOOTLOADER;
} else if (!strcmp(cmd, "fastboot")) {
value = REBOOT_MODE_FASTBOOT;
} else if (!strcmp(cmd, "recovery")) {
value = REBOOT_MODE_RECOVERY;
} else if (!strcmp(cmd, "dm-verity device corrupted")) {
value = REBOOT_MODE_DMVERITY_CORRUPTED;
} else if (!strcmp(cmd, "rescue")) {
value = REBOOT_MODE_RESCUE;
} else if (!strcmp(cmd, "shutdown-thermal") ||
!strcmp(cmd, "shutdown,thermal")) {
if (force_warm_reboot_on_thermal_shutdown)
force_warm_reboot = true;
value = REBOOT_MODE_SHUTDOWN_THERMAL;
} else if (!strcmp(cmd, "reboot-ab-update")) {
value = REBOOT_MODE_AB_UPDATE;
} else if (!strcmp(cmd, "from_fastboot") ||
!strcmp(cmd, "shell") ||
!strcmp(cmd, "userrequested") ||
!strcmp(cmd, "userrequested,fastboot") ||
!strcmp(cmd, "userrequested,recovery") ||
!strcmp(cmd, "userrequested,recovery,ui")) {
value = REBOOT_MODE_NORMAL;
} else {
pr_err("Unknown reboot command: '%s'\n", cmd);
}
/* check for warm_reboot */
if (force_warm_reboot)
reboot_mode = REBOOT_WARM;
if (value != U32_MAX)
exynos_reboot_mode_set(value);
}
}
static int exynos_reboot_handler(struct notifier_block *nb, unsigned long mode, void *cmd)
{
exynos_reboot_parse(cmd);
return NOTIFY_DONE;
}
static struct notifier_block exynos_reboot_nb = {
.notifier_call = exynos_reboot_handler,
.priority = INT_MAX,
};
static int exynos_restart_handler(struct notifier_block *this, unsigned long mode, void *cmd)
{
pr_info("ready to do restart.\n");
return NOTIFY_DONE;
}
static struct notifier_block exynos_restart_nb = {
.notifier_call = exynos_restart_handler,
.priority = 130,
};
static int exynos_reboot_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = pdev->dev.of_node;
struct regmap *pmureg;
struct device_node *syscon_np;
struct resource res;
int err;
pmureg = syscon_regmap_lookup_by_phandle(np, "syscon");
if (IS_ERR(pmureg)) {
dev_err(dev, "Fail to get regmap of PMU\n");
return PTR_ERR(pmureg);
}
syscon_np = of_parse_phandle(np, "syscon", 0);
if (!syscon_np) {
dev_err(dev, "syscon device node not found\n");
return -EINVAL;
}
if (of_address_to_resource(syscon_np, 0, &res)) {
dev_err(dev, "failed to get syscon base address\n");
return -ENOMEM;
}
pmu_alive_base = res.start;
if (of_property_read_u32(np, "reboot-cmd-offset", &reboot_cmd_offset) < 0) {
dev_info(dev, "failed to find reboot-offset property, using default\n");
reboot_cmd_offset = EXYNOS_PMU_SYSIP_DAT0;
}
force_warm_reboot_on_thermal_shutdown = of_property_read_bool(np,
"force-warm-reboot-on-thermal-shutdown");
err = register_reboot_notifier(&exynos_reboot_nb);
if (err) {
dev_err(dev, "cannot register reboot handler (err=%d)\n", err);
return err;
}
err = register_restart_handler(&exynos_restart_nb);
if (err) {
dev_err(dev, "cannot register restart handler (err=%d)\n", err);
unregister_reboot_notifier(&exynos_reboot_nb);
return err;
}
dev_info(dev, "register restart handler successfully\n");
return 0;
}
static const struct of_device_id exynos_reboot_of_match[] = {
{ .compatible = "samsung,exynos-reboot" },
{}
};
static struct platform_driver exynos_reboot_driver = {
.probe = exynos_reboot_probe,
.driver = {
.name = "exynos-reboot",
.of_match_table = exynos_reboot_of_match,
},
};
module_platform_driver(exynos_reboot_driver);
MODULE_DESCRIPTION("Exynos Reboot driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:exynos-reboot");
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