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/*
* Copyright (c) 2021 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <string.h>
#include <zephyr/drivers/flash.h>
#include <zephyr/init.h>
#include <soc.h>
#include "flash_stm32.h"
bool flash_stm32_valid_range(const struct device *dev, off_t offset,
uint32_t len,
bool write)
{
ARG_UNUSED(write);
return flash_stm32_range_exists(dev, offset, len);
}
static inline void flush_cache(FLASH_TypeDef *regs)
{
/* If Data cache is enabled, disable Data cache, reset Data cache
* and then re-enable Data cache.
*/
if (regs->ACR & FLASH_ACR_DCEN) {
regs->ACR &= ~FLASH_ACR_DCEN;
/* Datasheet: DCRST: Data cache reset
* This bit can be written only when the Data cache is disabled
*/
regs->ACR |= FLASH_ACR_DCRST;
regs->ACR &= ~FLASH_ACR_DCRST;
regs->ACR |= FLASH_ACR_DCEN;
}
/* If Instruction cache is enabled, disable Instruction cache, reset
* Instruction cache and then re-enable Instruction cache.
*/
if (regs->ACR & FLASH_ACR_ICEN) {
regs->ACR &= ~FLASH_ACR_ICEN;
/* Datasheet: ICRST: Instruction cache reset
* This bit can be written only when the Instruction cache
* is disabled
*/
regs->ACR |= FLASH_ACR_ICRST;
regs->ACR &= ~FLASH_ACR_ICRST;
regs->ACR |= FLASH_ACR_ICEN;
}
}
static int write_byte(const struct device *dev, off_t offset, uint8_t val)
{
FLASH_TypeDef *regs = FLASH_STM32_REGS(dev);
uint32_t tmp;
int rc;
/* if the control register is locked, do not fail silently */
if (regs->CR & FLASH_CR_LOCK) {
return -EIO;
}
/* Check that no Flash main memory operation is ongoing */
rc = flash_stm32_wait_flash_idle(dev);
if (rc < 0) {
return rc;
}
regs->CR &= ~FLASH_CR_PSIZE;
regs->CR |= FLASH_PSIZE_BYTE;
regs->CR |= FLASH_CR_PG;
/* flush the register write */
tmp = regs->CR;
*((uint8_t *) offset + CONFIG_FLASH_BASE_ADDRESS) = val;
/* Wait until the BSY bit is cleared */
rc = flash_stm32_wait_flash_idle(dev);
/* Clear the PG bit */
regs->CR &= (~FLASH_CR_PG);
return rc;
}
static int erase_sector(const struct device *dev, uint32_t sector)
{
FLASH_TypeDef *regs = FLASH_STM32_REGS(dev);
uint32_t tmp;
int rc;
/* if the control register is locked, do not fail silently */
if (regs->CR & FLASH_CR_LOCK) {
return -EIO;
}
/* Check that no Flash memory operation is ongoing */
rc = flash_stm32_wait_flash_idle(dev);
if (rc < 0) {
return rc;
}
regs->CR &= ~FLASH_CR_SNB;
regs->CR |= FLASH_CR_SER | (sector << 3);
regs->CR |= FLASH_CR_STRT;
/* flush the register write */
tmp = regs->CR;
/* Wait for the BSY bit */
rc = flash_stm32_wait_flash_idle(dev);
flush_cache(regs);
regs->CR &= ~(FLASH_CR_SER | FLASH_CR_SNB);
return rc;
}
int flash_stm32_block_erase_loop(const struct device *dev,
unsigned int offset,
unsigned int len)
{
struct flash_pages_info info;
uint32_t start_sector, end_sector;
uint32_t i;
int rc = 0;
rc = flash_get_page_info_by_offs(dev, offset, &info);
if (rc) {
return rc;
}
start_sector = info.index;
rc = flash_get_page_info_by_offs(dev, offset + len - 1, &info);
if (rc) {
return rc;
}
end_sector = info.index;
for (i = start_sector; i <= end_sector; i++) {
rc = erase_sector(dev, i);
if (rc < 0) {
break;
}
}
return rc;
}
int flash_stm32_write_range(const struct device *dev, unsigned int offset,
const void *data, unsigned int len)
{
int i, rc = 0;
for (i = 0; i < len; i++, offset++) {
rc = write_byte(dev, offset, ((const uint8_t *) data)[i]);
if (rc < 0) {
return rc;
}
}
return rc;
}
/*
* The flash memory in stm32f2 series has bank 1 only with 12 sectors,
* they are split as 4 sectors of 16 Kbytes, 1 sector of 64 Kbytes,
* and 7 sectors of 128 Kbytes.
*/
#ifndef FLASH_SECTOR_TOTAL
#error "Unknown flash layout"
#else /* defined(FLASH_SECTOR_TOTAL) */
#if FLASH_SECTOR_TOTAL == 12
static const struct flash_pages_layout stm32f2_flash_layout[] = {
/*
* PM0059, table 10: STM32F207xx
*/
{.pages_count = 4, .pages_size = KB(16)},
{.pages_count = 1, .pages_size = KB(64)},
{.pages_count = 7, .pages_size = KB(128)},
};
#else
#error "Unknown flash layout"
#endif /* FLASH_SECTOR_TOTAL == 12 */
#endif/* !defined(FLASH_SECTOR_TOTAL) */
void flash_stm32_page_layout(const struct device *dev,
const struct flash_pages_layout **layout,
size_t *layout_size)
{
ARG_UNUSED(dev);
*layout = stm32f2_flash_layout;
*layout_size = ARRAY_SIZE(stm32f2_flash_layout);
}