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flashrom/stm50flw0x0x.c
Carl-Daniel Hailfinger 5820f42ef2 Introduce a type "chipaddr" to abstract the offsets within flash regions 
Use chipaddr instead of volatile uint8_t * because when we access chips
in external flashers, they are not accessed via pointers at all.

Benefits: This allows us to differentiate between volatile machine
memory accesses and flash chip accesses. It also enforces usage
of chip_{read,write}[bwl] to access flash chips, so nobody will
unintentionally use pointers to access chips anymore. Some unneeded
casts are removed as well. Grepping for chip operations and machine
memory operations doesn't yield any false positives anymore.

Compile tested on 32 bit and 64 bit Linux.

Corresponding to flashrom svn r519.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
2009-05-16 21:22:56 +00:00

292 lines
7.2 KiB
C
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/*
* 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 <stdio.h>
#include <string.h>
#include <stdint.h>
#include "flash.h"
void protect_stm50flw0x0x(chipaddr bios)
{
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xA0, bios + 0x5555);
usleep(200);
}
int probe_stm50flw0x0x(struct flashchip *flash)
{
chipaddr bios = flash->virtual_memory;
uint8_t id1, id2;
uint32_t largeid1, largeid2;
/* Issue JEDEC Product ID Entry command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0x90, bios + 0x5555);
myusec_delay(40);
/* Read product ID */
id1 = chip_readb(bios);
id2 = chip_readb(bios + 0x01);
largeid1 = id1;
largeid2 = id2;
/* Check if it is a continuation ID, this should be a while loop. */
if (id1 == 0x7F) {
largeid1 <<= 8;
id1 = chip_readb(bios + 0x100);
largeid1 |= id1;
}
if (id2 == 0x7F) {
largeid2 <<= 8;
id2 = chip_readb(bios + 0x101);
largeid2 |= id2;
}
/* Issue JEDEC Product ID Exit command */
chip_writeb(0xAA, bios + 0x5555);
myusec_delay(10);
chip_writeb(0x55, bios + 0x2AAA);
myusec_delay(10);
chip_writeb(0xF0, bios + 0x5555);
myusec_delay(40);
printf_debug("%s: id1 0x%02x, id2 0x%02x\n", __FUNCTION__, largeid1,
largeid2);
if (largeid1 != flash->manufacture_id || largeid2 != flash->model_id)
return 0;
map_flash_registers(flash);
return 1;
}
static void wait_stm50flw0x0x(chipaddr bios)
{
uint8_t id1;
// id2;
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);
myusec_delay(10);
id1 = chip_readb(bios);
// 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;
int j;
// 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);
myusec_delay(10);
wait_stm50flw0x0x(flash->virtual_memory);
for (j = 0; j < flash->page_size; j++) {
if (chip_readb(bios + j) != 0xFF) {
printf("Erase failed at 0x%x\n", offset + j);
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, rc = 0;
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) && (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);
rc = unlock_block_stm50flw0x0x(flash, i * page_size);
if (!rc)
rc = erase_block_stm50flw0x0x(flash, i * page_size);
}
printf("\n");
protect_stm50flw0x0x(bios);
return rc;
}
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;
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
*/
if (!memcmp((void *)(buf + i * page_size),
(void *)(bios + i * page_size), 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);
return rc;
}
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