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/*
* Copyright (c) 2018 Aurelien Jarno
* Copyright (c) 2018 Yong Jin
*
* 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 <zephyr/sys/barrier.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 (regs->ACR & FLASH_ACR_ARTEN) {
regs->ACR &= ~FLASH_ACR_ARTEN;
/* Reference manual:
* The ART cache can be flushed only if the ART accelerator
* is disabled (ARTEN = 0).
*/
regs->ACR |= FLASH_ACR_ARTRST;
regs->ACR &= ~FLASH_ACR_ARTRST;
regs->ACR |= FLASH_ACR_ARTEN;
}
}
static int write_byte(const struct device *dev, off_t offset, uint8_t val)
{
FLASH_TypeDef *regs = FLASH_STM32_REGS(dev);
int rc;
/* if the control register is locked, do not fail silently */
if (regs->CR & FLASH_CR_LOCK) {
return -EIO;
}
rc = flash_stm32_wait_flash_idle(dev);
if (rc < 0) {
return rc;
}
/* prepare to write a single byte */
regs->CR = (regs->CR & CR_PSIZE_MASK) |
FLASH_PSIZE_BYTE | FLASH_CR_PG;
/* flush the register write */
barrier_dsync_fence_full();
/* write the data */
*((uint8_t *) offset + CONFIG_FLASH_BASE_ADDRESS) = val;
/* flush the register write */
barrier_dsync_fence_full();
rc = flash_stm32_wait_flash_idle(dev);
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);
int rc;
/* if the control register is locked, do not fail silently */
if (regs->CR & FLASH_CR_LOCK) {
return -EIO;
}
rc = flash_stm32_wait_flash_idle(dev);
if (rc < 0) {
return rc;
}
/* Dual bank mode, SNB MSB selects the bank2,
* others select sector, so we remap sector number.
*/
#if defined(FLASH_OPTCR_nDBANK) && FLASH_SECTOR_TOTAL == 24
#if CONFIG_FLASH_SIZE == 2048
if (sector > 11) {
sector += 4U;
}
#elif CONFIG_FLASH_SIZE == 1024
if (sector > 7) {
sector += 8U;
}
#endif /* CONFIG_FLASH_SIZE */
#endif /* defined(FLASH_OPTCR_nDBANK) && FLASH_SECTOR_TOTAL == 24 */
regs->CR = (regs->CR & ~(FLASH_CR_PSIZE | FLASH_CR_SNB)) |
FLASH_PSIZE_BYTE |
FLASH_CR_SER |
(sector << FLASH_CR_SNB_Pos) |
FLASH_CR_STRT;
/* flush the register write */
barrier_dsync_fence_full();
rc = flash_stm32_wait_flash_idle(dev);
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;
}
/* Some SoC can run in single or dual bank mode, others can't.
* Different SoC flash layouts are specified in various reference
* manuals, but the flash layout for a given number of sectors is
* consistent across these manuals. The number of sectors is given
* by the HAL as FLASH_SECTOR_TOTAL. And some SoC that with same
* FLASH_SECTOR_TOTAL have different flash size.
*
* In case of 8 sectors and 24 sectors we need to differentiate
* between two cases by using the memory size.
* In case of 24 sectors we need to check if the SoC is running
* in single or dual bank mode.
*/
#ifndef FLASH_SECTOR_TOTAL
#error "Unknown flash layout"
#elif FLASH_SECTOR_TOTAL == 2
static const struct flash_pages_layout stm32f7_flash_layout[] = {
/* RM0385, table 4: STM32F750xx */
{.pages_count = 2, .pages_size = KB(32)},
};
#elif FLASH_SECTOR_TOTAL == 4
static const struct flash_pages_layout stm32f7_flash_layout[] = {
/* RM0431, table 4: STM32F730xx */
{.pages_count = 4, .pages_size = KB(16)},
};
#elif FLASH_SECTOR_TOTAL == 8
#if CONFIG_FLASH_SIZE == 512
static const struct flash_pages_layout stm32f7_flash_layout[] = {
/* RM0431, table 3: STM32F72xxx and STM32F732xx/F733xx */
{.pages_count = 4, .pages_size = KB(16)},
{.pages_count = 1, .pages_size = KB(64)},
{.pages_count = 3, .pages_size = KB(128)},
};
#elif CONFIG_FLASH_SIZE == 1024
static const struct flash_pages_layout stm32f7_flash_layout[] = {
/* RM0385, table 3: STM32F756xx and STM32F74xxx */
{.pages_count = 4, .pages_size = KB(32)},
{.pages_count = 1, .pages_size = KB(128)},
{.pages_count = 3, .pages_size = KB(256)},
};
#endif /* CONFIG_FLASH_SIZE */
#elif FLASH_SECTOR_TOTAL == 24
static const struct flash_pages_layout stm32f7_flash_layout_single_bank[] = {
/* RM0410, table 3: STM32F76xxx and STM32F77xxx in single bank */
{.pages_count = 4, .pages_size = KB(32)},
{.pages_count = 1, .pages_size = KB(128)},
{.pages_count = 7, .pages_size = KB(256)},
};
static const struct flash_pages_layout stm32f7_flash_layout_dual_bank[] = {
/* RM0410, table 4: STM32F76xxx and STM32F77xxx in dual bank */
{.pages_count = 4, .pages_size = KB(16)},
{.pages_count = 1, .pages_size = KB(64)},
{.pages_count = 7, .pages_size = KB(128)},
{.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/* !defined(FLASH_SECTOR_TOTAL) */
void flash_stm32_page_layout(const struct device *dev,
const struct flash_pages_layout **layout,
size_t *layout_size)
{
#if FLASH_OPTCR_nDBANK
if (FLASH_STM32_REGS(dev)->OPTCR & FLASH_OPTCR_nDBANK) {
*layout = stm32f7_flash_layout_single_bank;
*layout_size = ARRAY_SIZE(stm32f7_flash_layout_single_bank);
} else {
*layout = stm32f7_flash_layout_dual_bank;
*layout_size = ARRAY_SIZE(stm32f7_flash_layout_dual_bank);
}
#else
ARG_UNUSED(dev);
*layout = stm32f7_flash_layout;
*layout_size = ARRAY_SIZE(stm32f7_flash_layout);
#endif
}