From c9d9b8082821668dfacb4c7a3fe9f8569acb29e1 Mon Sep 17 00:00:00 2001 From: Andy Yan Date: Tue, 1 Mar 2016 20:12:18 +0800 Subject: [PATCH] FROMLIST: power: reset: add reboot mode driver This driver parse the reboot commands like "reboot loader" and "reboot recovery" to get a boot mode described in the device tree , then call the write interfae to store the boot mode in some place like special register or sram , which can be read by the bootloader after system reboot, then the bootloader can take different action according to the mode stored. This is commonly used on Android based devices, in order to reboot the device into fastboot or recovery mode. Change-Id: Ifce5a22493a52f3e15332bbf3c94ce7217d7d17c Reviewed-by: Matthias Brugger Reviewed-by: Moritz Fischer Signed-off-by: Andy Yan Tested-by: John Stultz Acked-by: John Stultz --- drivers/power/reset/Kconfig | 16 ++++ drivers/power/reset/Makefile | 2 + drivers/power/reset/reboot-mode.c | 106 +++++++++++++++++++++++ drivers/power/reset/reboot-mode.h | 6 ++ drivers/power/reset/syscon-reboot-mode.c | 65 ++++++++++++++ 5 files changed, 195 insertions(+) create mode 100644 drivers/power/reset/reboot-mode.c create mode 100644 drivers/power/reset/reboot-mode.h create mode 100644 drivers/power/reset/syscon-reboot-mode.c diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig index 1131cf75acc6..61a8cd4b37f3 100644 --- a/drivers/power/reset/Kconfig +++ b/drivers/power/reset/Kconfig @@ -173,5 +173,21 @@ config POWER_RESET_ZX help Reboot support for ZTE SoCs. +config REBOOT_MODE + tristate + help + This driver will help to pass the system reboot mode + to bootloader + +config SYSCON_REBOOT_MODE + bool "Generic SYSCON regmap reboot mode driver" + depends on OF + select REBOOT_MODE + help + Say y here will enable reboot mode driver. This will + get reboot mode arguments and store it in SYSCON mapped + register, then the bootloader can read it to take different + action according to the mode. + endif diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile index 096fa67047f6..a63865ba8532 100644 --- a/drivers/power/reset/Makefile +++ b/drivers/power/reset/Makefile @@ -20,3 +20,5 @@ obj-$(CONFIG_POWER_RESET_SYSCON) += syscon-reboot.o obj-$(CONFIG_POWER_RESET_SYSCON_POWEROFF) += syscon-poweroff.o obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o +obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o +obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c new file mode 100644 index 000000000000..9aa7b809972c --- /dev/null +++ b/drivers/power/reset/reboot-mode.c @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include "reboot-mode.h" + +#define PREFIX "mode-" + +struct mode_info { + char mode[32]; + unsigned int magic; + struct list_head list; +}; + +struct reboot_mode_driver { + struct list_head head; + int (*write)(int magic); + struct notifier_block reboot_notifier; +}; + +static int get_reboot_mode_magic(struct reboot_mode_driver *reboot, + const char *cmd) +{ + const char *normal = "normal"; + int magic = 0; + struct mode_info *info; + + if (!cmd) + cmd = normal; + + list_for_each_entry(info, &reboot->head, list) { + if (!strcmp(info->mode, cmd)) { + magic = info->magic; + break; + } + } + + return magic; +} + +static int reboot_mode_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + struct reboot_mode_driver *reboot; + int magic; + + reboot = container_of(this, struct reboot_mode_driver, reboot_notifier); + magic = get_reboot_mode_magic(reboot, cmd); + if (magic) + reboot->write(magic); + + return NOTIFY_DONE; +} + +int reboot_mode_register(struct device *dev, int (*write)(int)) +{ + struct reboot_mode_driver *reboot; + struct mode_info *info; + struct property *prop; + size_t len = strlen(PREFIX); + int ret; + + reboot = devm_kzalloc(dev, sizeof(*reboot), GFP_KERNEL); + if (!reboot) + return -ENOMEM; + + reboot->write = write; + INIT_LIST_HEAD(&reboot->head); + for_each_property_of_node(dev->of_node, prop) { + if (len > strlen(prop->name) || strncmp(prop->name, PREFIX, len)) + continue; + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + strcpy(info->mode, prop->name + len); + if (of_property_read_u32(dev->of_node, prop->name, &info->magic)) { + dev_err(dev, "reboot mode %s without magic number\n", + info->mode); + devm_kfree(dev, info); + continue; + } + list_add_tail(&info->list, &reboot->head); + } + reboot->reboot_notifier.notifier_call = reboot_mode_notify; + ret = register_reboot_notifier(&reboot->reboot_notifier); + if (ret) + dev_err(dev, "can't register reboot notifier\n"); + + return ret; +} +EXPORT_SYMBOL_GPL(reboot_mode_register); + +MODULE_AUTHOR("Andy Yan +#include +#include +#include +#include +#include +#include +#include +#include +#include "reboot-mode.h" + +static struct regmap *map; +static u32 offset; +static u32 mask = 0xffffffff; + +static int syscon_reboot_mode_write(int magic) +{ + regmap_update_bits(map, offset, mask, magic); + + return 0; +} + +static int syscon_reboot_mode_probe(struct platform_device *pdev) +{ + int ret; + + map = syscon_node_to_regmap(pdev->dev.parent->of_node); + if (IS_ERR(map)) + return PTR_ERR(map); + if (of_property_read_u32(pdev->dev.of_node, "offset", &offset)) + return -EINVAL; + of_property_read_u32(pdev->dev.of_node, "mask", &mask); + ret = reboot_mode_register(&pdev->dev, syscon_reboot_mode_write); + if (ret) + dev_err(&pdev->dev, "can't register reboot mode\n"); + + return ret; +} + +static const struct of_device_id syscon_reboot_mode_of_match[] = { + { .compatible = "syscon-reboot-mode" }, + {} +}; + +static struct platform_driver syscon_reboot_mode_driver = { + .probe = syscon_reboot_mode_probe, + .driver = { + .name = "syscon-reboot-mode", + .of_match_table = syscon_reboot_mode_of_match, + }, +}; +module_platform_driver(syscon_reboot_mode_driver); + +MODULE_AUTHOR("Andy Yan