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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
* Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
* Copyright (C) 2013 Stefan Tauner
*
* 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
*/
/*
* All ST M50 chips are locked on startup. Most of them have a uniform 64 kB block layout, but some have
* a non-uniform block/sector segmentation which has to be handled with more care. Some of the non-uniform
* chips support erasing of the 4 kB sectors with another command.
*/
#include "flash.h"
#include "flashchips.h"
#include "chipdrivers.h"
static int stm50_unlock_address(struct flashctx *flash, int offset)
{
chipaddr wrprotect = flash->virtual_registers + 2;
static const uint8_t unlock_sector = 0x00;
msg_cdbg("unlocking at 0x%x\n", offset);
chip_writeb(flash, unlock_sector, wrprotect + offset);
if (chip_readb(flash, wrprotect + offset) != unlock_sector) {
msg_cerr("Cannot unlock address 0x%x\n", offset);
return -1;
}
return 0;
}
/* Chips known to use a non-uniform block and sector layout for locking (as well as for erasing):
* Name Size Address range of lock registers
* M50FLW080A 1MB FFB00002 - FFBFF002
* M50FLW080B 1MB FFB00002 - FFBFF002
* M50FW002 256k FFBC0002 - FFBFC002
* M50LPW116 2MB FFA00002 - FFBFC002
*/
int unlock_stm50_nonuniform(struct flashctx *flash)
{
int i;
struct eraseblock *eraseblocks = flash->chip->block_erasers[0].eraseblocks;
unsigned int done = 0;
for (i = 0; i < NUM_ERASEREGIONS && eraseblocks[i].count != 0; i++) {
unsigned int block_size = eraseblocks[i].size;
unsigned int block_count = eraseblocks[i].count;
int j;
for (j = 0; j < block_count; j++) {
if (stm50_unlock_address(flash, done)) {
msg_cerr("UNLOCK FAILED!\n");
return -1;
}
done += block_count * block_size;
}
}
return 0;
}
/* Unlocking for uniform 64 kB blocks starting at offset 2 of the feature registers. */
int unlock_stm50_uniform(struct flashctx *flash)
{
int i;
for (i = 0; i < flash->chip->total_size * 1024; i+= 64 * 1024) {
if (stm50_unlock_address(flash, i)) {
msg_cerr("UNLOCK FAILED!\n");
return -1;
}
}
return 0;
}
static int stm50_erase_sector(struct flashctx *flash, unsigned int addr)
{
chipaddr bios = flash->virtual_memory + addr;
// clear status register
chip_writeb(flash, 0x50, bios);
// now start it
chip_writeb(flash, 0x32, bios);
chip_writeb(flash, 0xd0, bios);
programmer_delay(10);
uint8_t status = wait_82802ab(flash);
print_status_82802ab(status);
return status == 0x80;
}
/* Some ST M50* chips do support erasing of sectors. This function will derive the erase function to use from
* the length of the of the block. For calls that apparently do not address a sector (but a block) we just call
* the block erase function instead. FIXME: This duplicates the behavior of the remaining erasers for blocks and
* might be fixed when flashrom supports multiple functions per eraser or erasers that do erase parts of the
* chip only. */
int erase_sector_stm50(struct flashctx *flash, unsigned int addr, unsigned int len)
{
if (len == 4096)
return stm50_erase_sector(flash, addr);
else
return erase_block_82802ab(flash, addr, len);
}
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