177 lines
3.7 KiB
C
177 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2019 Philippe Retornaz <philippe@shapescale.com>
|
|
* Copyright (c) 2017 Linaro Limited
|
|
* Copyright (c) 2017 BayLibre, SAS
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define LOG_DOMAIN flash_stm32g0
|
|
#define LOG_LEVEL CONFIG_FLASH_LOG_LEVEL
|
|
#include <logging/log.h>
|
|
LOG_MODULE_REGISTER(LOG_DOMAIN);
|
|
|
|
#include <kernel.h>
|
|
#include <device.h>
|
|
#include <string.h>
|
|
#include <drivers/flash.h>
|
|
#include <init.h>
|
|
#include <soc.h>
|
|
|
|
#include "flash_stm32.h"
|
|
|
|
|
|
#define STM32G0X_PAGE_SHIFT 11
|
|
|
|
|
|
/*
|
|
* offset and len must be aligned on 8 for write,
|
|
* positive and not beyond end of flash
|
|
*/
|
|
bool flash_stm32_valid_range(const struct device *dev, off_t offset,
|
|
uint32_t len,
|
|
bool write)
|
|
{
|
|
return (!write || (offset % 8 == 0 && len % 8 == 0)) &&
|
|
flash_stm32_range_exists(dev, offset, len);
|
|
}
|
|
|
|
/*
|
|
* STM32G0xx devices can have up to 64 2K pages
|
|
*/
|
|
static unsigned int get_page(off_t offset)
|
|
{
|
|
return offset >> STM32G0X_PAGE_SHIFT;
|
|
}
|
|
|
|
static int write_dword(const struct device *dev, off_t offset, uint64_t val)
|
|
{
|
|
volatile uint32_t *flash = (uint32_t *)(offset + CONFIG_FLASH_BASE_ADDRESS);
|
|
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;
|
|
}
|
|
|
|
/* Check if this double word is erased */
|
|
if (flash[0] != 0xFFFFFFFFUL ||
|
|
flash[1] != 0xFFFFFFFFUL) {
|
|
return -EIO;
|
|
}
|
|
|
|
/* Set the PG bit */
|
|
regs->CR |= FLASH_CR_PG;
|
|
|
|
/* Flush the register write */
|
|
tmp = regs->CR;
|
|
|
|
/* Perform the data write operation at the desired memory address */
|
|
flash[0] = (uint32_t)val;
|
|
flash[1] = (uint32_t)(val >> 32);
|
|
|
|
/* 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_page(const struct device *dev, unsigned int page)
|
|
{
|
|
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;
|
|
}
|
|
|
|
/* Set the PER bit and select the page you wish to erase */
|
|
regs->CR |= FLASH_CR_PER;
|
|
regs->CR &= ~FLASH_CR_PNB_Msk;
|
|
regs->CR |= ((page % 256) << 3);
|
|
|
|
/* Set the STRT bit */
|
|
regs->CR |= FLASH_CR_STRT;
|
|
|
|
/* flush the register write */
|
|
tmp = regs->CR;
|
|
|
|
/* Wait for the BSY bit */
|
|
rc = flash_stm32_wait_flash_idle(dev);
|
|
|
|
regs->CR &= ~FLASH_CR_PER;
|
|
|
|
return rc;
|
|
}
|
|
|
|
int flash_stm32_block_erase_loop(const struct device *dev,
|
|
unsigned int offset,
|
|
unsigned int len)
|
|
{
|
|
int i, rc = 0;
|
|
|
|
i = get_page(offset);
|
|
for (; i <= get_page(offset + len - 1) ; ++i) {
|
|
rc = erase_page(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 += 8, offset += 8) {
|
|
rc = write_dword(dev, offset, ((const uint64_t *) data)[i>>3]);
|
|
if (rc < 0) {
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void flash_stm32_page_layout(const struct device *dev,
|
|
const struct flash_pages_layout **layout,
|
|
size_t *layout_size)
|
|
{
|
|
static struct flash_pages_layout stm32g0_flash_layout = {
|
|
.pages_count = 0,
|
|
.pages_size = 0,
|
|
};
|
|
|
|
ARG_UNUSED(dev);
|
|
|
|
if (stm32g0_flash_layout.pages_count == 0) {
|
|
stm32g0_flash_layout.pages_count = FLASH_SIZE / FLASH_PAGE_SIZE;
|
|
stm32g0_flash_layout.pages_size = FLASH_PAGE_SIZE;
|
|
}
|
|
|
|
*layout = &stm32g0_flash_layout;
|
|
*layout_size = 1;
|
|
}
|