blob: 37e560c0591aacc597fa7070771e64ec958b7bfe [file] [log] [blame]
Stefan Tauner4404f732013-09-12 08:28:56 +00001/*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
5 * Copyright (C) 2009 Sean Nelson <audiohacked@gmail.com>
6 * Copyright (C) 2013 Stefan Tauner
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
Stefan Tauner4404f732013-09-12 08:28:56 +000017 */
18
19/*
20 * All ST M50 chips are locked on startup. Most of them have a uniform 64 kB block layout, but some have
21 * a non-uniform block/sector segmentation which has to be handled with more care. Some of the non-uniform
22 * chips support erasing of the 4 kB sectors with another command.
23 */
24
25#include "flash.h"
Stefan Tauner4404f732013-09-12 08:28:56 +000026#include "chipdrivers.h"
27
Stefan Taunerbeaffd82013-09-12 08:29:06 +000028static int stm50_erase_sector(struct flashctx *flash, unsigned int addr)
Stefan Tauner4404f732013-09-12 08:28:56 +000029{
Stefan Taunerbeaffd82013-09-12 08:29:06 +000030 chipaddr bios = flash->virtual_memory + addr;
Stefan Tauner4404f732013-09-12 08:28:56 +000031
32 // clear status register
33 chip_writeb(flash, 0x50, bios);
34 // now start it
35 chip_writeb(flash, 0x32, bios);
36 chip_writeb(flash, 0xd0, bios);
37 programmer_delay(10);
38
Stefan Taunerbeaffd82013-09-12 08:29:06 +000039 uint8_t status = wait_82802ab(flash);
40 print_status_82802ab(status);
Stefan Tauner4404f732013-09-12 08:28:56 +000041
Stefan Taunerbeaffd82013-09-12 08:29:06 +000042 return status == 0x80;
43}
44
45/* Some ST M50* chips do support erasing of sectors. This function will derive the erase function to use from
46 * the length of the of the block. For calls that apparently do not address a sector (but a block) we just call
47 * the block erase function instead. FIXME: This duplicates the behavior of the remaining erasers for blocks and
48 * might be fixed when flashrom supports multiple functions per eraser or erasers that do erase parts of the
49 * chip only. */
50int erase_sector_stm50(struct flashctx *flash, unsigned int addr, unsigned int len)
51{
52 if (len == 4096)
53 return stm50_erase_sector(flash, addr);
54 else
55 return erase_block_82802ab(flash, addr, len);
Stefan Tauner4404f732013-09-12 08:28:56 +000056}