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1/*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2007 Markus Boas <ryven@ryven.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#include <string.h>
22#include "flash.h"
23
24/* According to the Winbond W29EE011, W29EE012, W29C010M, W29C011A
25 * datasheets this is the only valid probe function for those chips.
26 */
27int probe_w29ee011(struct flashctx *flash)
28{
29chipaddr bios = flash->virtual_memory;
30uint8_t id1, id2;
31
32if (!chip_to_probe || strcmp(chip_to_probe, flash->chip->name)) {
33msg_cdbg("Old Winbond W29* probe method disabled because "
34 "the probing sequence puts the AMIC A49LF040A in "
35 "a funky state. Use 'flashrom -c %s' if you "
36 "have a board with such a chip.\n", flash->chip->name);
37return 0;
38}
39
40/* Issue JEDEC Product ID Entry command */
41chip_writeb(flash, 0xAA, bios + 0x5555);
42programmer_delay(10);
43chip_writeb(flash, 0x55, bios + 0x2AAA);
44programmer_delay(10);
45chip_writeb(flash, 0x80, bios + 0x5555);
46programmer_delay(10);
47chip_writeb(flash, 0xAA, bios + 0x5555);
48programmer_delay(10);
49chip_writeb(flash, 0x55, bios + 0x2AAA);
50programmer_delay(10);
51chip_writeb(flash, 0x60, bios + 0x5555);
52programmer_delay(10);
53
54/* Read product ID */
55id1 = chip_readb(flash, bios);
56id2 = chip_readb(flash, bios + 0x01);
57
58/* Issue JEDEC Product ID Exit command */
59chip_writeb(flash, 0xAA, bios + 0x5555);
60programmer_delay(10);
61chip_writeb(flash, 0x55, bios + 0x2AAA);
62programmer_delay(10);
63chip_writeb(flash, 0xF0, bios + 0x5555);
64programmer_delay(10);
65
66msg_cdbg("%s: id1 0x%02x, id2 0x%02x\n", __func__, id1, id2);
67
68if (id1 == flash->chip->manufacture_id && id2 == flash->chip->model_id)
69return 1;
70
71return 0;
72}

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