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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef __CROS_EC_STM32_FLASH_REGS_H
#define __CROS_EC_STM32_FLASH_REGS_H
#include <stdbool.h>
/**
* Unlock the flash control register using the unlock sequence.
*
* If the flash control register has been disabled since the last reset when
* this function is called, a bus fault will be generated.
*
* See "3.5.1 Unlocking the Flash control register" in RM0402.
* See "4.9.2 FLASH key register for bank 1" in RM0433.
*/
void unlock_flash_control_register(void);
/**
* Unlock the flash option bytes register using the unlock sequence.
*
* If the flash option bytes register has been disabled since the last reset
* when this function is called, a bus fault will be generated.
*
* See "3.6.2 Programming user option bytes" in RM0402.
* See "4.9.3 FLASH option key register" in RM0433.
*/
void unlock_flash_option_bytes(void);
/**
* Lock the flash control register.
*
* If the flash control register has been disabled since the last reset when
* this function is called, a bus fault will be generated.
*
* See "3.5.1 Unlocking the Flash control register" in RM0402.
* See "4.9.4 Flash control register for bank 1" in RM0433.
*/
void lock_flash_control_register(void);
/**
* Lock the flash option bytes register.
*
* If the flash option bytes register has been disabled since the last reset
* when this function is called, a bus fault will be generated.
*
* See "3.6.2 Programming user option bytes" in RM0402.
* See "4.9.7 FLASH option control register" in RM0433.
*/
void lock_flash_option_bytes(void);
/**
* Disable the flash option bytes register.
*
* This function expects that bus faults have not already been ignored when
* called.
*
* Once this function is called any attempt at accessing the flash option
* bytes register will generate a bus fault until the next reset.
*
* See "3.6.2 Programming user option bytes" in RM0402.
* See "4.9.7 FLASH option control register" in RM0433.
*/
void disable_flash_option_bytes(void);
/**
* Disable the flash control register.
*
* This function expects that bus faults have not already been ignored when
* called.
*
* Once this function is called any attempt at accessing the flash control
* register will generate a bus fault until the next reset.
*
* See "3.5.1 Unlocking the Flash control register" in RM0402.
* See "4.9.4 Flash control register for bank 1" in RM0433.
*/
void disable_flash_control_register(void);
/**
* Check if the flash option bytes are locked.
*
* If the flash option bytes register has been disabled since the last reset
* when this function is called, a bus fault will be generated.
* See "3.6.2 Programming user option bytes" in RM0402.
* See "4.9.7 FLASH option control register" in RM0433.
*
* @return true if option bytes are locked, false otherwise
*/
bool flash_option_bytes_locked(void);
/**
* Check if the flash control register is locked.
*
* If the flash control register has been disabled since the last reset
* when this function is called, a bus fault will be generated.
*
* See "3.5.1 Unlocking the Flash control register" in RM0402.
* See "4.9.4 Flash control register for bank 1" in RM0433.
*
* @return true if register is locked, false otherwise
*/
bool flash_control_register_locked(void);
#endif /* __CROS_EC_STM32_FLASH_REGS_H */
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