1 /*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2008 Claus Gindhart <[email protected]>
5 * Copyright (C) 2009 Sean Nelson <[email protected]>
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.
17 */
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"
26 #include "chipdrivers.h"
27
stm50_erase_sector(struct flashctx * flash,unsigned int addr)28 static int stm50_erase_sector(struct flashctx *flash, unsigned int addr)
29 {
30 chipaddr bios = flash->virtual_memory + addr;
31
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(flash, 10);
38
39 uint8_t status = wait_82802ab(flash);
40 print_status_82802ab(status);
41
42 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. */
erase_sector_stm50(struct flashctx * flash,unsigned int addr,unsigned int len)50 int 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);
56 }
57