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Diffstat (limited to 'stm50.c')
| -rw-r--r-- | stm50.c | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/stm50.c b/stm50.c new file mode 100644 index 000000000..26bd6ed91 --- /dev/null +++ b/stm50.c @@ -0,0 +1,103 @@ +/* + * 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; +} + +/* This function is unused. */ +int erase_sector_stm50(struct flashctx *flash, unsigned int sector, unsigned int sectorsize) +{ + chipaddr bios = flash->virtual_memory + sector; + + // clear status register + chip_writeb(flash, 0x50, bios); + // now start it + chip_writeb(flash, 0x32, bios); + chip_writeb(flash, 0xd0, bios); + programmer_delay(10); + + wait_82802ab(flash); + + /* FIXME: Check the status register for errors. */ + return 0; +} |