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beaffd8859
Affected chips: M50FLW040A, M50FLW040B, M50FLW080A, M50FLW080B. Corresponding to flashrom svn r1738. Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at> Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/*
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* This file is part of the flashrom project.
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*
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* Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
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* Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
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* Copyright (C) 2013 Stefan Tauner
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* All ST M50 chips are locked on startup. Most of them have a uniform 64 kB block layout, but some have
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* a non-uniform block/sector segmentation which has to be handled with more care. Some of the non-uniform
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* chips support erasing of the 4 kB sectors with another command.
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*/
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#include "flash.h"
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#include "flashchips.h"
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#include "chipdrivers.h"
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static int stm50_unlock_address(struct flashctx *flash, int offset)
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{
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chipaddr wrprotect = flash->virtual_registers + 2;
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static const uint8_t unlock_sector = 0x00;
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msg_cdbg("unlocking at 0x%x\n", offset);
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chip_writeb(flash, unlock_sector, wrprotect + offset);
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if (chip_readb(flash, wrprotect + offset) != unlock_sector) {
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msg_cerr("Cannot unlock address 0x%x\n", offset);
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return -1;
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}
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return 0;
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}
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/* Chips known to use a non-uniform block and sector layout for locking (as well as for erasing):
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* Name Size Address range of lock registers
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* M50FLW080A 1MB FFB00002 - FFBFF002
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* M50FLW080B 1MB FFB00002 - FFBFF002
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* M50FW002 256k FFBC0002 - FFBFC002
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* M50LPW116 2MB FFA00002 - FFBFC002
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*/
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int unlock_stm50_nonuniform(struct flashctx *flash)
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{
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int i;
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struct eraseblock *eraseblocks = flash->chip->block_erasers[0].eraseblocks;
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unsigned int done = 0;
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for (i = 0; i < NUM_ERASEREGIONS && eraseblocks[i].count != 0; i++) {
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unsigned int block_size = eraseblocks[i].size;
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unsigned int block_count = eraseblocks[i].count;
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int j;
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for (j = 0; j < block_count; j++) {
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if (stm50_unlock_address(flash, done)) {
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msg_cerr("UNLOCK FAILED!\n");
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return -1;
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}
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done += block_count * block_size;
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}
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}
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return 0;
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}
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/* Unlocking for uniform 64 kB blocks starting at offset 2 of the feature registers. */
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int unlock_stm50_uniform(struct flashctx *flash)
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{
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int i;
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for (i = 0; i < flash->chip->total_size * 1024; i+= 64 * 1024) {
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if (stm50_unlock_address(flash, i)) {
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msg_cerr("UNLOCK FAILED!\n");
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return -1;
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}
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}
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return 0;
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}
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static int stm50_erase_sector(struct flashctx *flash, unsigned int addr)
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{
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chipaddr bios = flash->virtual_memory + addr;
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// clear status register
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chip_writeb(flash, 0x50, bios);
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// now start it
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chip_writeb(flash, 0x32, bios);
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chip_writeb(flash, 0xd0, bios);
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programmer_delay(10);
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uint8_t status = wait_82802ab(flash);
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print_status_82802ab(status);
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return status == 0x80;
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}
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/* Some ST M50* chips do support erasing of sectors. This function will derive the erase function to use from
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* the length of the of the block. For calls that apparently do not address a sector (but a block) we just call
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* the block erase function instead. FIXME: This duplicates the behavior of the remaining erasers for blocks and
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* might be fixed when flashrom supports multiple functions per eraser or erasers that do erase parts of the
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* chip only. */
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int erase_sector_stm50(struct flashctx *flash, unsigned int addr, unsigned int len)
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{
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if (len == 4096)
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return stm50_erase_sector(flash, addr);
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else
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return erase_block_82802ab(flash, addr, len);
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}
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