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/************************************************************************************
* arch/arm/src/stm32/stm32_flash.c
*
* Copyright (C) 2011 Uros Platise. All rights reserved.
* Author: Uros Platise <uros.platise@isotel.eu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************************************/
/* Provides standard flash access functions, to be used by the flash mtd driver.
* The interface is defined in the include/nuttx/progmem.h
*
* Requirements during write/erase operations on FLASH:
* - HSI must be ON.
* - Low Power Modes are not permitted during write/erase
*/
/************************************************************************************
* Included Files
************************************************************************************/
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include <errno.h>
#include "stm32_flash.h"
#include "stm32_rcc.h"
#include "stm32_waste.h"
#include "up_arch.h"
/* Only for the STM32F10xx family for now */
#ifdef CONFIG_STM32_STM32F10XX
/************************************************************************************
* Pre-processor Definitions
************************************************************************************/
#define FLASH_KEY1 0x45670123
#define FLASH_KEY2 0xCDEF89AB
/************************************************************************************
* Private Functions
************************************************************************************/
void stm32_flash_unlock(void)
{
while (getreg32(STM32_FLASH_SR) & FLASH_SR_BSY)
{
up_waste();
}
if (getreg32(STM32_FLASH_CR) & FLASH_CR_LOCK)
{
/* Unlock sequence */
putreg32(FLASH_KEY1, STM32_FLASH_KEYR);
putreg32(FLASH_KEY2, STM32_FLASH_KEYR);
}
}
void stm32_flash_lock(void)
{
modifyreg16(STM32_FLASH_CR, 0, FLASH_CR_LOCK);
}
/************************************************************************************
* Public Functions
************************************************************************************/
uint16_t up_progmem_npages(void)
{
return STM32_FLASH_NPAGES;
}
bool up_progmem_isuniform(void)
{
return true;
}
uint16_t up_progmem_pagesize(uint16_t page)
{
return STM32_FLASH_PAGESIZE;
}
int up_progmem_getpage(uint32_t addr)
{
if (addr >= STM32_FLASH_SIZE)
{
return -EFAULT;
}
return addr / STM32_FLASH_PAGESIZE;
}
int up_progmem_erasepage(uint16_t page)
{
uint32_t addr;
uint16_t count;
if (page >= STM32_FLASH_NPAGES)
{
return -EFAULT;
}
/* Get flash ready and begin erasing single page */
if (!(getreg32(STM32_RCC_CR) & RCC_CR_HSION))
{
return -EPERM;
}
stm32_flash_unlock();
modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_PER);
putreg32(page * STM32_FLASH_PAGESIZE, STM32_FLASH_AR);
modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_STRT);
while(getreg32(STM32_FLASH_SR) & FLASH_SR_BSY) up_waste();
modifyreg32(STM32_FLASH_CR, FLASH_CR_PER, 0);
/* Verify */
for (addr = page * STM32_FLASH_PAGESIZE + STM32_FLASH_BASE, count = STM32_FLASH_PAGESIZE;
count; count-=4, addr += 4)
{
if (getreg32(addr) != 0xffffffff)
{
return -EIO;
}
}
return STM32_FLASH_PAGESIZE;
}
int up_progmem_ispageerased(uint16_t page)
{
uint32_t addr;
uint16_t count;
uint16_t bwritten = 0;
if (page >= STM32_FLASH_NPAGES)
{
return -EFAULT;
}
/* Verify */
for (addr = page * STM32_FLASH_PAGESIZE + STM32_FLASH_BASE, count = STM32_FLASH_PAGESIZE;
count; count--, addr++)
{
if (getreg8(addr) != 0xff)
{
bwritten++;
}
}
return bwritten;
}
int up_progmem_write(uint32_t addr, const void *buf, size_t count)
{
uint16_t *hword = (uint16_t *)buf;
size_t written = count;
/* STM32 requires half-word access */
if (count & 1)
{
return -EINVAL;
}
/* Check for valid address range */
if ((addr+count) >= STM32_FLASH_SIZE)
{
return -EFAULT;
}
/* Get flash ready and begin flashing */
if (!(getreg32(STM32_RCC_CR) & RCC_CR_HSION))
{
return -EPERM;
}
stm32_flash_unlock();
modifyreg32(STM32_FLASH_CR, 0, FLASH_CR_PG);
for (addr += STM32_FLASH_BASE; count; count--, hword++, addr+=2)
{
/* Write half-word and wait to complete */
putreg16(*hword, addr);
while(getreg32(STM32_FLASH_SR) & FLASH_SR_BSY) up_waste();
/* Verify */
if (getreg32(STM32_FLASH_SR) & FLASH_SR_WRPRT_ERR)
{
modifyreg32(STM32_FLASH_CR, FLASH_CR_PG, 0);
return -EROFS;
}
if (getreg16(addr) != *hword)
{
modifyreg32(STM32_FLASH_CR, FLASH_CR_PG, 0);
return -EIO;
}
}
modifyreg32(STM32_FLASH_CR, FLASH_CR_PG, 0);
return written;
}
#endif /* CONFIG_STM32_STM32F10XX */
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