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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2008 coresystems GmbH
*
* 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
*/
#include "flash.h"
#include "chipdrivers.h"
static int unlock_block_winbond_fwhub(struct flashchip *flash, int offset)
{
chipaddr wrprotect = flash->virtual_registers + offset + 2;
uint8_t locking;
printf_debug("Trying to unlock block @0x%08x = 0x%02x\n", offset,
chip_readb(wrprotect));
locking = chip_readb(wrprotect);
switch (locking & 0x7) {
case 0:
printf_debug("Full Access.\n");
return 0;
case 1:
printf_debug("Write Lock (Default State).\n");
chip_writeb(0, wrprotect);
return 0;
case 2:
printf_debug("Locked Open (Full Access, Lock Down).\n");
return 0;
case 3:
fprintf(stderr, "Error: Write Lock, Locked Down.\n");
return -1;
case 4:
printf_debug("Read Lock.\n");
chip_writeb(0, wrprotect);
return 0;
case 5:
printf_debug("Read/Write Lock.\n");
chip_writeb(0, wrprotect);
return 0;
case 6:
fprintf(stderr, "Error: Read Lock, Locked Down.\n");
return -1;
case 7:
fprintf(stderr, "Error: Read/Write Lock, Locked Down.\n");
return -1;
}
/* We will never reach this point, but GCC doesn't know */
return -1;
}
int unlock_winbond_fwhub(struct flashchip *flash)
{
int i, total_size = flash->total_size * 1024;
chipaddr bios = flash->virtual_memory;
uint8_t locking;
/* Are there any hardware restrictions that we can't overcome?
* If flashrom fail here, someone's got to check all those GPIOs.
*/
/* Product Identification Entry */
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0x90, bios + 0x5555);
programmer_delay(10);
/* Read Hardware Lock Bits */
locking = chip_readb(bios + 0xffff2);
/* Product Identification Exit */
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xF0, bios + 0x5555);
programmer_delay(10);
printf_debug("Lockout bits:\n");
if (locking & (1 << 2))
fprintf(stderr, "Error: hardware bootblock locking (#TBL).\n");
else
printf_debug("No hardware bootblock locking (good!)\n");
if (locking & (1 << 3))
fprintf(stderr, "Error: hardware block locking (#WP).\n");
else
printf_debug("No hardware block locking (good!)\n");
if (locking & ((1 << 2) | (1 << 3)))
return -1;
/* Unlock the complete chip */
for (i = 0; i < total_size; i += flash->page_size)
if (unlock_block_winbond_fwhub(flash, i))
return -1;
return 0;
}
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