/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-03-16     luobeihai    first version
 *
 */

#include "board.h"

#ifdef BSP_USING_ON_CHIP_FLASH
#include "drv_flash.h"

#if defined(RT_USING_FAL)
#include "fal.h"
#endif

#define DRV_DEBUG
#define LOG_TAG                "drv.flash"
#include <drv_log.h>

#if (defined(APM32F10X_HD) || defined(APM32F10X_CL))
#define FLASH_PAGE_SIZE          0x800U
#elif (defined(APM32F10X_LD) || defined(APM32F10X_MD))
#define FLASH_PAGE_SIZE          0x400U
#endif

/**
  * @brief  Gets the page of a given address
  * @param  Addr: Address of the FLASH Memory
  * @retval The page of a given address
  */
static uint32_t GetPage(uint32_t addr)
{
    uint32_t page = 0;
    page = RT_ALIGN_DOWN(addr, FLASH_PAGE_SIZE);
    return page;
}

/**
 * Read data from flash.
 * @note This operation's units is word.
 *
 * @param addr flash address
 * @param buf buffer to store read data
 * @param size read bytes size
 *
 * @return result
 */
int apm32_flash_read(rt_uint32_t addr, rt_uint8_t *buf, size_t size)
{
    size_t i;

    if ((addr + size) > APM32_FLASH_END_ADDRESS)
    {
        LOG_E("read outrange flash size! addr is (0x%p)", (void *)(addr + size));
        return -RT_EINVAL;
    }

    for (i = 0; i < size; i++, buf++, addr++)
    {
        *buf = *(rt_uint8_t *) addr;
    }

    return size;
}

/**
 * Write data to flash.
 * @note This operation's units is word.
 * @note This operation must after erase. @see flash_erase.
 *
 * @param addr flash address
 * @param buf the write data buffer
 * @param size write bytes size
 *
 * @return result
 */
int apm32_flash_write(rt_uint32_t addr, const rt_uint8_t *buf, size_t size)
{
    rt_err_t result        = RT_EOK;
    rt_uint32_t end_addr   = addr + size;

    if (addr % 4 != 0)
    {
        LOG_E("write addr must be 4-byte alignment");
        return -RT_EINVAL;
    }

    if ((end_addr) > APM32_FLASH_END_ADDRESS)
    {
        LOG_E("write outrange flash size! addr is (0x%p)", (void *)(addr + size));
        return -RT_EINVAL;
    }

    FMC_Unlock();

    while (addr < end_addr)
    {
        if (FMC_ProgramWord(addr, *((rt_uint32_t *)buf)) == FMC_STATUS_COMPLETE)
        {
            if (*(rt_uint32_t *)addr != *(rt_uint32_t *)buf)
            {
                result = -RT_ERROR;
                break;
            }
            addr += 4;
            buf  += 4;
        }
        else
        {
            result = -RT_ERROR;
            break;
        }
    }

    FMC_Lock();

    if (result != RT_EOK)
    {
        return result;
    }

    return size;
}

/**
 * @brief erase data on flash .
 * @note this operation is irreversible.
 * @note this operation's units is different which on many chips.
 *
 * @param addr flash address
 * @param size erase bytes size
 *
 * @return result
 */
int apm32_flash_erase(rt_uint32_t addr, size_t size)
{
    rt_err_t result = RT_EOK;
    rt_uint32_t start_addr = addr;
    rt_uint32_t end_addr = addr + size;
    rt_uint32_t page_addr = 0;

    FMC_Unlock();

    if ((end_addr) > APM32_FLASH_END_ADDRESS)
    {
        LOG_E("erase outrange flash size! addr is (0x%p)", (void *)(addr + size));
        return -RT_EINVAL;
    }

    /* clear program error flag */
    if (FMC_ReadStatus() == FMC_STATUS_ERROR_PG)
    {
        FMC_ClearStatusFlag(FMC_FLAG_PE);
    }

    while(addr < end_addr)
    {
        page_addr = GetPage(addr);

        if(FMC_ErasePage(page_addr) != FMC_STATUS_COMPLETE)
        {
            result = -RT_ERROR;
            goto __exit;
        }

        addr += FLASH_PAGE_SIZE;
    }

__exit:
    FMC_Lock();

    if(result != RT_EOK)
    {
        return result;
    }

    LOG_D("erase done: addr (0x%p), size %d", (void *)start_addr, size);

    return size;
}


#if defined(RT_USING_FAL)

static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size);
static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size);
static int fal_flash_erase(long offset, size_t size);

const struct fal_flash_dev apm32_onchip_flash = { "onchip_flash", APM32_FLASH_START_ADRESS, APM32_FLASH_SIZE, FLASH_PAGE_SIZE, {NULL, fal_flash_read, fal_flash_write, fal_flash_erase} };

static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size)
{
    return apm32_flash_read(apm32_onchip_flash.addr + offset, buf, size);
}

static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size)
{
    return apm32_flash_write(apm32_onchip_flash.addr + offset, buf, size);
}

static int fal_flash_erase(long offset, size_t size)
{
    return apm32_flash_erase(apm32_onchip_flash.addr + offset, size);
}

#endif
#endif /* BSP_USING_ON_CHIP_FLASH */