/*
 * This file is part of the Micro Python project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2013, 2014 Damien P. George
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "py/mpconfig.h"
#include "py/misc.h"
#include "flash.h"

typedef struct {
    uint32_t base_address;
    uint32_t sector_size;
    uint32_t sector_count;
} flash_layout_t;

#if defined(MCU_SERIES_F4)

static const flash_layout_t flash_layout[] = {
    { 0x08000000, 0x04000, 4 },
    { 0x08010000, 0x10000, 1 },
    { 0x08020000, 0x20000, 3 },
    #if defined(FLASH_SECTOR_8)
    { 0x08080000, 0x20000, 4 },
    #endif
    #if defined(FLASH_SECTOR_12)
    { 0x08100000, 0x04000, 4 },
    { 0x08110000, 0x10000, 1 },
    { 0x08120000, 0x20000, 7 },
    #endif
};

#elif defined(MCU_SERIES_F7)

// FLASH_FLAG_PGSERR (Programming Sequence Error) was renamed to
// FLASH_FLAG_ERSERR (Erasing Sequence Error) in STM32F7
#define FLASH_FLAG_PGSERR FLASH_FLAG_ERSERR

static const flash_layout_t flash_layout[] = {
    { 0x08000000, 0x08000, 4 },
    { 0x08020000, 0x20000, 1 },
    { 0x08040000, 0x40000, 3 },
};

#elif defined(MCU_SERIES_L4)

static const flash_layout_t flash_layout[] = {
    { (uint32_t)FLASH_BASE, (uint32_t)FLASH_PAGE_SIZE, 512 },
};

#else
#error Unsupported processor
#endif

#if defined(MCU_SERIES_L4)

// get the bank of a given flash address
static uint32_t get_bank(uint32_t addr) {
    if (READ_BIT(SYSCFG->MEMRMP, SYSCFG_MEMRMP_FB_MODE) == 0) {
        // no bank swap
        if (addr < (FLASH_BASE + FLASH_BANK_SIZE)) {
            return FLASH_BANK_1;
        } else {
            return FLASH_BANK_2;
        }
    } else {
        // bank swap
        if (addr < (FLASH_BASE + FLASH_BANK_SIZE)) {
            return FLASH_BANK_2;
        } else {
            return FLASH_BANK_1;
        }
    }
}

// get the page of a given flash address
static uint32_t get_page(uint32_t addr) {
    if (addr < (FLASH_BASE + FLASH_BANK_SIZE)) {
        // bank 1
        return (addr - FLASH_BASE) / FLASH_PAGE_SIZE;
    } else {
        // bank 2
        return (addr - (FLASH_BASE + FLASH_BANK_SIZE)) / FLASH_PAGE_SIZE;
    }
}

#endif

uint32_t flash_get_sector_info(uint32_t addr, uint32_t *start_addr, uint32_t *size) {
    if (addr >= flash_layout[0].base_address) {
        uint32_t sector_index = 0;
        for (int i = 0; i < MP_ARRAY_SIZE(flash_layout); ++i) {
            for (int j = 0; j < flash_layout[i].sector_count; ++j) {
                uint32_t sector_start_next = flash_layout[i].base_address
                    + (j + 1) * flash_layout[i].sector_size;
                if (addr < sector_start_next) {
                    if (start_addr != NULL) {
                        *start_addr = flash_layout[i].base_address
                            + j * flash_layout[i].sector_size;
                    }
                    if (size != NULL) {
                        *size = flash_layout[i].sector_size;
                    }
                    return sector_index;
                }
                ++sector_index;
            }
        }
    }
    return 0;
}

void flash_erase(uint32_t flash_dest, const uint32_t *src, uint32_t num_word32) {
    // check there is something to write
    if (num_word32 == 0) {
        return;
    }

    // unlock
    HAL_FLASH_Unlock();

    FLASH_EraseInitTypeDef EraseInitStruct;

    #if defined(MCU_SERIES_L4)
    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);

    // erase the sector(s)
    // The sector returned by flash_get_sector_info can not be used
    // as the flash has on each bank 0/1 pages 0..255
    EraseInitStruct.TypeErase   = FLASH_TYPEERASE_PAGES;
    EraseInitStruct.Banks       = get_bank(flash_dest);
    EraseInitStruct.Page        = get_page(flash_dest);
    EraseInitStruct.NbPages     = get_page(flash_dest + 4 * num_word32 - 1) - EraseInitStruct.Page + 1;;
    #else
    // Clear pending flags (if any)
    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
                           FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR | FLASH_FLAG_PGSERR);

    // erase the sector(s)
    EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
    EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3; // voltage range needs to be 2.7V to 3.6V
    EraseInitStruct.Sector = flash_get_sector_info(flash_dest, NULL, NULL);
    EraseInitStruct.NbSectors = flash_get_sector_info(flash_dest + 4 * num_word32 - 1, NULL, NULL) - EraseInitStruct.Sector + 1;
    #endif

    uint32_t SectorError = 0;
    if (HAL_FLASHEx_Erase(&EraseInitStruct, &SectorError) != HAL_OK) {
        // error occurred during sector erase
        HAL_FLASH_Lock(); // lock the flash
        return;
    }
}

/*
// erase the sector using an interrupt
void flash_erase_it(uint32_t flash_dest, const uint32_t *src, uint32_t num_word32) {
    // check there is something to write
    if (num_word32 == 0) {
        return;
    }

    // unlock
    HAL_FLASH_Unlock();

    // Clear pending flags (if any)
    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
                           FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);

    // erase the sector(s)
    FLASH_EraseInitTypeDef EraseInitStruct;
    EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
    EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3; // voltage range needs to be 2.7V to 3.6V
    EraseInitStruct.Sector = flash_get_sector_info(flash_dest, NULL, NULL);
    EraseInitStruct.NbSectors = flash_get_sector_info(flash_dest + 4 * num_word32 - 1, NULL, NULL) - EraseInitStruct.Sector + 1;
    if (HAL_FLASHEx_Erase_IT(&EraseInitStruct) != HAL_OK) {
        // error occurred during sector erase
        HAL_FLASH_Lock(); // lock the flash
        return;
    }
}
*/

void flash_write(uint32_t flash_dest, const uint32_t *src, uint32_t num_word32) {
    #if defined(MCU_SERIES_L4)

    // program the flash uint64 by uint64
    for (int i = 0; i < num_word32 / 2; i++) {
        uint64_t val = *(uint64_t*)src;
        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, flash_dest, val) != HAL_OK) {
            // error occurred during flash write
            HAL_FLASH_Lock(); // lock the flash
            return;
        }
        flash_dest += 8;
        src += 2;
    }
    if ((num_word32 & 0x01) == 1) {
        uint64_t val = *(uint64_t*)flash_dest;
        val = (val & 0xffffffff00000000uL) | (*src);
        if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, flash_dest, val) != HAL_OK) {
            // error occurred during flash write
            HAL_FLASH_Lock(); // lock the flash
            return;
        }
    }

    #else

    // program the flash word by word
    for (int i = 0; i < num_word32; i++) {
        if (HAL_FLASH_Program(TYPEPROGRAM_WORD, flash_dest, *src) != HAL_OK) {
            // error occurred during flash write
            HAL_FLASH_Lock(); // lock the flash
            return;
        }
        flash_dest += 4;
        src += 1;
    }

    #endif

    // lock the flash
    HAL_FLASH_Lock();
}

/*
 use erase, then write
void flash_erase_and_write(uint32_t flash_dest, const uint32_t *src, uint32_t num_word32) {
    // check there is something to write
    if (num_word32 == 0) {
        return;
    }

    // unlock
    HAL_FLASH_Unlock();

    // Clear pending flags (if any)
    __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR |
                           FLASH_FLAG_PGAERR | FLASH_FLAG_PGPERR|FLASH_FLAG_PGSERR);

    // erase the sector(s)
    FLASH_EraseInitTypeDef EraseInitStruct;
    EraseInitStruct.TypeErase = TYPEERASE_SECTORS;
    EraseInitStruct.VoltageRange = VOLTAGE_RANGE_3; // voltage range needs to be 2.7V to 3.6V
    EraseInitStruct.Sector = flash_get_sector_info(flash_dest, NULL, NULL);
    EraseInitStruct.NbSectors = flash_get_sector_info(flash_dest + 4 * num_word32 - 1, NULL, NULL) - EraseInitStruct.Sector + 1;
    uint32_t SectorError = 0;
    if (HAL_FLASHEx_Erase(&EraseInitStruct, &SectorError) != HAL_OK) {
        // error occurred during sector erase
        HAL_FLASH_Lock(); // lock the flash
        return;
    }

    // program the flash word by word
    for (int i = 0; i < num_word32; i++) {
        if (HAL_FLASH_Program(TYPEPROGRAM_WORD, flash_dest, *src) != HAL_OK) {
            // error occurred during flash write
            HAL_FLASH_Lock(); // lock the flash
            return;
        }
        flash_dest += 4;
        src += 1;
    }

    // lock the flash
    HAL_FLASH_Lock();
}
*/