u-boot/drivers/mtd/stm32_flash.c
Vikas Manocha 9082517a85 stm32: stm32_flash: add memory barrier during flash write
After writing data to flash space, next instruction is checking if flash
controller is busy writing to the flash memory. Memory barrier is required here
to avoid transaction re-ordering for data write and busy status check.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
2016-04-11 20:48:23 -04:00

152 lines
3.4 KiB
C

/*
* (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(5) | 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;
}