stm32_flash.c
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/*
* (C) Copyright 2015
* Kamil Lulko, <kamil.lulko@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/stm32.h>
#include "stm32_flash.h"
flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
#define STM32_FLASH ((struct stm32_flash_regs *)FLASH_CNTL_BASE)
void stm32_flash_latency_cfg(int latency)
{
/* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */
writel(FLASH_ACR_WS(latency) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN
| FLASH_ACR_DCEN, &STM32_FLASH->acr);
}
static void stm32_flash_lock(u8 lock)
{
if (lock) {
setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_LOCK);
} else {
writel(STM32_FLASH_KEY1, &STM32_FLASH->key);
writel(STM32_FLASH_KEY2, &STM32_FLASH->key);
}
}
unsigned long flash_init(void)
{
unsigned long total_size = 0;
u8 i, j;
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
flash_info[i].flash_id = FLASH_STM32;
flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
flash_info[i].start[0] = CONFIG_SYS_FLASH_BASE + (i << 20);
flash_info[i].size = sect_sz_kb[0];
for (j = 1; j < CONFIG_SYS_MAX_FLASH_SECT; j++) {
flash_info[i].start[j] = flash_info[i].start[j - 1]
+ (sect_sz_kb[j - 1]);
flash_info[i].size += sect_sz_kb[j];
}
total_size += flash_info[i].size;
}
return total_size;
}
void flash_print_info(flash_info_t *info)
{
int i;
if (info->flash_id == FLASH_UNKNOWN) {
printf("missing or unknown FLASH type\n");
return;
} else if (info->flash_id == FLASH_STM32) {
printf("stm32 Embedded Flash\n");
}
printf(" Size: %ld MB in %d Sectors\n",
info->size >> 20, info->sector_count);
printf(" Sector Start Addresses:");
for (i = 0; i < info->sector_count; ++i) {
if ((i % 5) == 0)
printf("\n ");
printf(" %08lX%s",
info->start[i],
info->protect[i] ? " (RO)" : " ");
}
printf("\n");
return;
}
int flash_erase(flash_info_t *info, int first, int last)
{
u8 bank = 0xFF;
int i;
for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
if (info == &flash_info[i]) {
bank = i;
break;
}
}
if (bank == 0xFF)
return -1;
stm32_flash_lock(0);
for (i = first; i <= last; i++) {
while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
;
/* clear old sector number before writing a new one */
clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SNB_MASK);
if (bank == 0) {
setbits_le32(&STM32_FLASH->cr,
(i << STM32_FLASH_CR_SNB_OFFSET));
} else if (bank == 1) {
setbits_le32(&STM32_FLASH->cr,
((0x10 | i) << STM32_FLASH_CR_SNB_OFFSET));
} else {
stm32_flash_lock(1);
return -1;
}
setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_STRT);
while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
;
clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
}
stm32_flash_lock(1);
return 0;
}
int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
ulong i;
while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
;
stm32_flash_lock(0);
setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
/* To make things simple use byte writes only */
for (i = 0; i < cnt; i++) {
*(uchar *)(addr + i) = src[i];
/* avoid re-ordering flash data write and busy status
* check as flash memory space attributes are generally Normal
*/
mb();
while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
;
}
clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
stm32_flash_lock(1);
return 0;
}