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w39.c
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w39.c
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/*
* This file is part of the flashrom project.
*
* Copyright (C) 2008 coresystems GmbH
* Copyright (C) 2010 Carl-Daniel Hailfinger
*
* 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 printlock_w39_fwh_block(struct flashchip *flash, int offset)
{
chipaddr wrprotect = flash->virtual_registers + offset + 2;
uint8_t locking;
locking = chip_readb(wrprotect);
msg_cdbg("Lock status of block at 0x%08x is ", offset);
switch (locking & 0x7) {
case 0:
msg_cdbg("Full Access.\n");
break;
case 1:
msg_cdbg("Write Lock (Default State).\n");
break;
case 2:
msg_cdbg("Locked Open (Full Access, Lock Down).\n");
break;
case 3:
msg_cerr("Error: Write Lock, Locked Down.\n");
break;
case 4:
msg_cdbg("Read Lock.\n");
break;
case 5:
msg_cdbg("Read/Write Lock.\n");
break;
case 6:
msg_cerr("Error: Read Lock, Locked Down.\n");
break;
case 7:
msg_cerr("Error: Read/Write Lock, Locked Down.\n");
break;
}
/* Read or write lock present? */
return (locking & ((1 << 2) | (1 << 0))) ? -1 : 0;
}
static int unlock_w39_fwh_block(struct flashchip *flash, int offset)
{
chipaddr wrprotect = flash->virtual_registers + offset + 2;
uint8_t locking;
locking = chip_readb(wrprotect);
/* Read or write lock present? */
if (locking & ((1 << 2) | (1 << 0))) {
/* Lockdown active? */
if (locking & (1 << 1)) {
msg_cerr("Can't unlock block at 0x%x!\n", offset);
return -1;
} else {
msg_cdbg("Unlocking block at 0x%x\n", offset);
chip_writeb(0, wrprotect);
}
}
return 0;
}
static uint8_t w39_idmode_readb(struct flashchip *flash, int offset)
{
chipaddr bios = flash->virtual_memory;
uint8_t val;
/* Product Identification Entry */
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0x90, bios + 0x5555);
programmer_delay(10);
/* Read something, maybe hardware lock bits */
val = chip_readb(bios + offset);
/* Product Identification Exit */
chip_writeb(0xAA, bios + 0x5555);
chip_writeb(0x55, bios + 0x2AAA);
chip_writeb(0xF0, bios + 0x5555);
programmer_delay(10);
return val;
}
static int printlock_w39_tblwp(uint8_t lock)
{
msg_cdbg("Hardware bootblock locking (#TBL) is %sactive.\n",
(lock & (1 << 2)) ? "" : "not ");
msg_cdbg("Hardware remaining chip locking (#WP) is %sactive..\n",
(lock & (1 << 3)) ? "" : "not ");
if (lock & ((1 << 2) | (1 << 3)))
return -1;
return 0;
}
static int printlock_w39_bootblock_64k16k(uint8_t lock)
{
msg_cdbg("Software 64 kB bootblock locking is %sactive.\n",
(lock & (1 << 0)) ? "" : "not ");
msg_cdbg("Software 16 kB bootblock locking is %sactive.\n",
(lock & (1 << 1)) ? "" : "not ");
if (lock & ((1 << 1) | (1 << 0)))
return -1;
return 0;
}
static int printlock_w39_common(struct flashchip *flash, int offset)
{
uint8_t lock;
lock = w39_idmode_readb(flash, offset);
msg_cdbg("Lockout bits:\n");
return printlock_w39_tblwp(lock);
}
static int printlock_w39_fwh(struct flashchip *flash)
{
int i, total_size = flash->total_size * 1024;
int ret = 0;
/* Print lock status of the complete chip */
for (i = 0; i < total_size; i += flash->page_size)
ret |= printlock_w39_fwh_block(flash, i);
return ret;
}
static int unlock_w39_fwh(struct flashchip *flash)
{
int i, total_size = flash->total_size * 1024;
/* Unlock the complete chip */
for (i = 0; i < total_size; i += flash->page_size)
if (unlock_w39_fwh_block(flash, i))
return -1;
return 0;
}
int printlock_w39l040(struct flashchip * flash)
{
uint8_t lock;
int ret;
lock = w39_idmode_readb(flash, 0x00002);
msg_cdbg("Bottom boot block:\n");
ret = printlock_w39_bootblock_64k16k(lock);
lock = w39_idmode_readb(flash, 0x7fff2);
msg_cdbg("Top boot block:\n");
ret |= printlock_w39_bootblock_64k16k(lock);
return ret;
}
int printlock_w39v040a(struct flashchip *flash)
{
uint8_t lock;
int ret = 0;
/* The W39V040A datasheet contradicts itself on the lock register
* location: 0x00002 and 0x7fff2 are both mentioned. Pick the one
* which is similar to the other chips of the same family.
*/
lock = w39_idmode_readb(flash, 0x7fff2);
msg_cdbg("Lockout bits:\n");
ret = printlock_w39_tblwp(lock);
ret |= printlock_w39_bootblock_64k16k(lock);
return ret;
}
int printlock_w39v040b(struct flashchip *flash)
{
return printlock_w39_common(flash, 0x7fff2);
}
int printlock_w39v040c(struct flashchip *flash)
{
/* Typo in the datasheet? The other chips use 0x7fff2. */
return printlock_w39_common(flash, 0xfff2);
}
int printlock_w39v040fa(struct flashchip *flash)
{
int ret = 0;
ret = printlock_w39v040a(flash);
ret |= printlock_w39_fwh(flash);
return ret;
}
int printlock_w39v040fb(struct flashchip *flash)
{
int ret = 0;
ret = printlock_w39v040b(flash);
ret |= printlock_w39_fwh(flash);
return ret;
}
int printlock_w39v040fc(struct flashchip *flash)
{
int ret = 0;
/* W39V040C and W39V040FC use different WP/TBL offsets. */
ret = printlock_w39_common(flash, 0x7fff2);
ret |= printlock_w39_fwh(flash);
return ret;
}
int printlock_w39v080a(struct flashchip *flash)
{
return printlock_w39_common(flash, 0xffff2);
}
int printlock_w39v080fa(struct flashchip *flash)
{
int ret = 0;
ret = printlock_w39v080a(flash);
ret |= printlock_w39_fwh(flash);
return ret;
}
int printlock_w39v080fa_dual(struct flashchip *flash)
{
msg_cinfo("Block locking for W39V080FA in dual mode is "
"undocumented.\n");
/* Better safe than sorry. */
return -1;
}
int unlock_w39v040fb(struct flashchip *flash)
{
if (unlock_w39_fwh(flash))
return -1;
if (printlock_w39_common(flash, 0x7fff2))
return -1;
return 0;
}
int unlock_w39v080fa(struct flashchip *flash)
{
if (unlock_w39_fwh(flash))
return -1;
if (printlock_w39_common(flash, 0xffff2))
return -1;
return 0;
}