/* SPDX-FileCopyrightText: 2024 Google LLC */
/* SPDX-License-Identifier: Apache-2.0 */

#include "drivers/dbgserial.h"
#include "system/bootbits.h"
#include "system/rtc_registers.h"

#include "git_version.auto.h"

#include "stm32f4xx.h"

#include <inttypes.h>
#include <stdint.h>

static const uint32_t s_bootloader_timestamp = GIT_TIMESTAMP;

void boot_bit_init(void) {
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
  PWR_BackupAccessCmd(ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, DISABLE);

  if (!boot_bit_test(BOOT_BIT_INITIALIZED)) {
    RTC_WriteBackupRegister(RTC_BKP_BOOTBIT_DR, BOOT_BIT_INITIALIZED);
  }
}

void boot_bit_set(BootBitValue bit) {
  uint32_t current_value = RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
  current_value |= bit;
  RTC_WriteBackupRegister(RTC_BKP_BOOTBIT_DR, current_value);
}

void boot_bit_clear(BootBitValue bit) {
  uint32_t current_value = RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
  current_value &= ~bit;
  RTC_WriteBackupRegister(RTC_BKP_BOOTBIT_DR, current_value);
}

bool boot_bit_test(BootBitValue bit) {
  uint32_t current_value = RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR);
  return (current_value & bit);
}

void boot_bit_dump(void) {
  dbgserial_print("Boot bits: ");
  dbgserial_print_hex(RTC_ReadBackupRegister(RTC_BKP_BOOTBIT_DR));
  dbgserial_newline();
}

void boot_version_write(void) {
  if (boot_version_read() == s_bootloader_timestamp) {
    return;
  }
  RTC_WriteBackupRegister(BOOTLOADER_VERSION_REGISTER, s_bootloader_timestamp);
}

uint32_t boot_version_read(void) {
  return RTC_ReadBackupRegister(BOOTLOADER_VERSION_REGISTER);
}
