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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>
*
* 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 "flash.h"
#include "flashchips.h"
#include "chipdrivers.h"
/*
* claus.gindhart@kontron.com
* The ST M50FLW080B and STM50FLW080B chips have to be unlocked,
* before you can erase them or write to them.
*/
static int unlock_block_stm50flw0x0x(struct flashchip *flash, int offset)
{
chipaddr wrprotect = flash->virtual_registers + 2;
static 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 probably
* 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) {
msg_cdbg("unlocking at 0x%x\n", offset + j);
chip_writeb(unlock_sector, wrprotect + offset + j);
if (chip_readb(wrprotect + offset + j) != unlock_sector) {
msg_cerr("Cannot unlock sector @ 0x%x\n",
offset + j);
return -1;
}
}
} else {
msg_cdbg("unlocking at 0x%x\n", offset);
chip_writeb(unlock_sector, wrprotect + offset);
if (chip_readb(wrprotect + offset) != unlock_sector) {
msg_cerr("Cannot unlock sector @ 0x%x\n", offset);
return -1;
}
}
return 0;
}
int unlock_stm50flw0x0x(struct flashchip *flash)
{
int i;
for (i = 0; i < flash->total_size * 1024; i+= flash->page_size) {
if(unlock_block_stm50flw0x0x(flash, i)) {
msg_cerr("UNLOCK FAILED!\n");
return -1;
}
}
return 0;
}
/* This function is unused. */
int erase_sector_stm50flw0x0x(struct flashchip *flash, unsigned int sector, unsigned int sectorsize)
{
chipaddr bios = flash->virtual_memory + sector;
// clear status register
chip_writeb(0x50, bios);
// now start it
chip_writeb(0x32, bios);
chip_writeb(0xd0, bios);
programmer_delay(10);
wait_82802ab(flash);
/* FIXME: Check the status register for errors. */
return 0;
}
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