mbed-os/drivers/FlashIAP.cpp

/* mbed Microcontroller Library
 * Copyright (c) 2017 ARM Limited
 *
 * 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 <string.h>
#include "FlashIAP.h"
#include "mbed_assert.h"


#ifdef DEVICE_FLASH

namespace mbed {

SingletonPtr<PlatformMutex> FlashIAP::_mutex;

static inline bool is_aligned(uint32_t number, uint32_t alignment)
{
    if ((number % alignment) != 0) {
        return false;
    } else {
        return true;
    }
}

FlashIAP::FlashIAP()
{

}

FlashIAP::~FlashIAP()
{

}

int FlashIAP::init()
{
    int ret = 0;
    _mutex->lock();
    if (flash_init(&_flash)) {
        ret = -1; 
    }
    _mutex->unlock();
    return ret;
}

int FlashIAP::deinit()
{
    int ret = 0;
    _mutex->lock();
    if (flash_free(&_flash)) {
        ret = -1; 
    }
    _mutex->unlock();
    return ret;
}


int FlashIAP::read(void *buffer, uint32_t addr, uint32_t size)
{
    _mutex->lock();
    memcpy(buffer, (const void *)addr, size);
    _mutex->unlock();
    return 0;
}

int FlashIAP::program(const void *buffer, uint32_t addr, uint32_t size)
{
    uint32_t page_size = get_page_size();
    uint32_t current_sector_size = flash_get_sector_size(&_flash, addr);
    // addr and size should be aligned to page size, and multiple of page size
    // page program should not cross sector boundaries
    if (!is_aligned(addr, page_size) ||
        !is_aligned(size, page_size) ||
        (size < page_size) ||
        (((addr % current_sector_size) + size) > current_sector_size)) {
        return -1;
    }

    int ret = 0;
    _mutex->lock();
    if (flash_program_page(&_flash, addr, (const uint8_t *)buffer, size)) {
        ret = -1;
    }
    _mutex->unlock();
    return ret;
}

bool FlashIAP::is_aligned_to_sector(uint32_t addr, uint32_t size)
{
    uint32_t current_sector_size = flash_get_sector_size(&_flash, addr);
    if (!is_aligned(size, current_sector_size) ||
        !is_aligned(addr, current_sector_size)) {
        return false;
    } else {
        return true;
    }
}

int FlashIAP::erase(uint32_t addr, uint32_t size)
{
    uint32_t current_sector_size = 0UL;

    if (!is_aligned_to_sector(addr, size)) {
        return -1;
    }

    int32_t ret = 0;
    _mutex->lock();
    while (size) {
        ret = flash_erase_sector(&_flash, addr);
        if (ret != 0) {
            ret = -1;
            break;
        }
        current_sector_size = flash_get_sector_size(&_flash, addr);
        if (!is_aligned_to_sector(addr, size)) {
            ret = -1;
            break;
        }
        size -= current_sector_size;
        addr += current_sector_size;
    }
    _mutex->unlock();
    return ret;
}

uint32_t FlashIAP::get_page_size() const
{
    return flash_get_page_size(&_flash);
}

uint32_t FlashIAP::get_sector_size(uint32_t addr) const
{
    return flash_get_sector_size(&_flash, addr);
}

uint32_t FlashIAP::get_flash_start() const
{
    return flash_get_start_address(&_flash);
}

uint32_t FlashIAP::get_flash_size() const
{
    return flash_get_size(&_flash);
}

}

#endif