/*
* This file is part of the flashrom project.
*
* Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* This module is designed for supporting the devices
* ST M50FLW040A (not yet tested)
* ST M50FLW040B (not yet tested)
* ST M50FLW080A
* ST M50FLW080B (not yet tested)
*/
#include <string.h>
#include <stdlib.h>
#include "flash.h"
#include "flashchips.h"
void protect_stm50flw0x0x(chipaddr bios)
{
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xA0, bios + 0x5555);
programmer_delay(200);
}
int probe_stm50flw0x0x(struct flashchip *flash)
{
int result = probe_jedec(flash);
if (!result)
return result;
map_flash_registers(flash);
return 1;
}
static void wait_stm50flw0x0x(chipaddr bios)
{
chip_writeb(0x70, bios);
if ((chip_readb(bios) & 0x80) == 0) { // it's busy
while ((chip_readb(bios) & 0x80) == 0) ;
}
// put another command to get out of status register mode
chip_writeb(0x90, bios);
programmer_delay(10);
chip_readb(bios); // Read device ID (to make sure?)
// this is needed to jam it out of "read id" mode
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xF0, bios + 0x5555);
}
/*
* claus.gindhart@kontron.com
* The ST M50FLW080B and STM50FLW080B chips have to be unlocked,
* before you can erase them or write to them.
*/
int unlock_block_stm50flw0x0x(struct flashchip *flash, int offset)
{
chipaddr wrprotect = flash->virtual_registers + 2;
const uint8_t unlock_sector = 0x00;
int j;
/*
* These chips have to be unlocked before you can erase them or write
* to them. The size of the locking sectors depends on the type
* of chip.
*
* Sometimes, the BIOS does this for you; so you propably
* don't need to worry about that.
*/
/* Check, if it's is a top/bottom-block with 4k-sectors. */
/* TODO: What about the other types? */
if ((offset == 0) ||
(offset == (flash->model_id == ST_M50FLW080A ? 0xE0000 : 0x10000))
|| (offset == 0xF0000)) {
// unlock each 4k-sector
for (j = 0; j < 0x10000; j += 0x1000) {
printf_debug("unlocking at 0x%x\n", offset + j);
chip_writeb(unlock_sector, wrprotect + offset + j);
if (chip_readb(wrprotect + offset + j) != unlock_sector) {
printf("Cannot unlock sector @ 0x%x\n",
offset + j);
return -1;
}
}
} else {
printf_debug("unlocking at 0x%x\n", offset);
chip_writeb(unlock_sector, wrprotect + offset);
if (chip_readb(wrprotect + offset) != unlock_sector) {
printf("Cannot unlock sector @ 0x%x\n", offset);
return -1;
}
}
return 0;
}
int erase_block_stm50flw0x0x(struct flashchip *flash, int offset)
{
chipaddr bios = flash->virtual_memory + offset;
// clear status register
chip_writeb(0x50, bios);
printf_debug("Erase at 0x%lx\n", bios);
// now start it
chip_writeb(0x20, bios);
chip_writeb(0xd0, bios);
programmer_delay(10);
wait_stm50flw0x0x(flash->virtual_memory);
if (check_erased_range(flash, offset, flash->page_size)) {
fprintf(stderr, "ERASE FAILED!\n");
return -1;
}
printf("DONE BLOCK 0x%x\n", offset);
return 0;
}
int write_page_stm50flw0x0x(chipaddr bios, uint8_t *src,
chipaddr dst, int page_size)
{
int i, rc = 0;
chipaddr d = dst;
uint8_t *s = src;
/* transfer data from source to destination */
for (i = 0; i < page_size; i++) {
chip_writeb(0x40, dst);
chip_writeb(*src++, dst++);
wait_stm50flw0x0x(bios);
}
/* claus.gindhart@kontron.com
* TODO
* I think, that verification is not required, but
* i leave it in anyway
*/
dst = d;
src = s;
for (i = 0; i < page_size; i++) {
if (chip_readb(dst) != *src) {
rc = -1;
break;
}
dst++;
src++;
}
if (rc) {
fprintf(stderr, " page 0x%lx failed!\n",
(d - bios) / page_size);
}
return rc;
}
/* I simply erase block by block
* I Chip This is not the fastest way, but it works
*/
int erase_stm50flw0x0x(struct flashchip *flash)
{
int i;
int total_size = flash->total_size * 1024;
int page_size = flash->page_size;
chipaddr bios = flash->virtual_memory;
printf("Erasing page:\n");
for (i = 0; i < total_size / page_size; i++) {
printf
("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
printf("%04d at address: 0x%08x ", i, i * page_size);
if (unlock_block_stm50flw0x0x(flash, i * page_size)) {
fprintf(stderr, "UNLOCK FAILED!\n");
return -1;
}
if (erase_block_stm50flw0x0x(flash, i * page_size)) {
fprintf(stderr, "ERASE FAILED!\n");
return -1;
}
}
printf("\n");
protect_stm50flw0x0x(bios);
return 0;
}
int write_stm50flw0x0x(struct flashchip *flash, uint8_t * buf)
{
int i, rc = 0;
int total_size = flash->total_size * 1024;
int page_size = flash->page_size;
chipaddr bios = flash->virtual_memory;
uint8_t *tmpbuf = malloc(page_size);
if (!tmpbuf) {
printf("Could not allocate memory!\n");
exit(1);
}
printf("Programming page: \n");
for (i = 0; (i < total_size / page_size) && (rc == 0); i++) {
printf
("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
printf("%04d at address: 0x%08x ", i, i * page_size);
/* Auto Skip Blocks, which already contain the desired data
* Faster, because we only write, what has changed
* More secure, because blocks, which are excluded
* (with the exclude or layout feature)
* are not erased and rewritten; data is retained also
* in sudden power off situations
*/
chip_readn(tmpbuf, bios + i * page_size, page_size);
if (!memcmp((void *)(buf + i * page_size), tmpbuf, page_size)) {
printf("SKIPPED\n");
continue;
}
rc = unlock_block_stm50flw0x0x(flash, i * page_size);
if (!rc)
rc = erase_block_stm50flw0x0x(flash, i * page_size);
if (!rc)
write_page_stm50flw0x0x(bios, buf + i * page_size,
bios + i * page_size, page_size);
}
printf("\n");
protect_stm50flw0x0x(bios);
free(tmpbuf);
return rc;
}