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Markus Boasd2ac6fc2007-08-30 10:17:50 +00001/*
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
Jens Kuehnelb9f61742008-06-18 13:36:34 +000021#include <string.h>
Markus Boasd2ac6fc2007-08-30 10:17:50 +000022#include "flash.h"
23
Carl-Daniel Hailfinger2e88a9f2011-07-26 14:18:52 +000024/* According to the Winbond W29EE011, W29EE012, W29C010M, W29C011A
25 * datasheets this is the only valid probe function for those chips.
26 */
Markus Boasd2ac6fc2007-08-30 10:17:50 +000027int probe_w29ee011(struct flashchip *flash)
28{
Carl-Daniel Hailfinger5820f422009-05-16 21:22:56 +000029 chipaddr bios = flash->virtual_memory;
Markus Boasd2ac6fc2007-08-30 10:17:50 +000030 uint8_t id1, id2;
Jens Kuehnelb9f61742008-06-18 13:36:34 +000031
Carl-Daniel Hailfinger2e88a9f2011-07-26 14:18:52 +000032 if (!chip_to_probe || strcmp(chip_to_probe, flash->name)) {
33 msg_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->name);
Jens Kuehnelb9f61742008-06-18 13:36:34 +000037 return 0;
38 }
Markus Boasd2ac6fc2007-08-30 10:17:50 +000039
40 /* Issue JEDEC Product ID Entry command */
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000041 chip_writeb(0xAA, bios + 0x5555);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000042 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000043 chip_writeb(0x55, bios + 0x2AAA);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000044 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000045 chip_writeb(0x80, bios + 0x5555);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000046 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000047 chip_writeb(0xAA, bios + 0x5555);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000048 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000049 chip_writeb(0x55, bios + 0x2AAA);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000050 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000051 chip_writeb(0x60, bios + 0x5555);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000052 programmer_delay(10);
Markus Boasd2ac6fc2007-08-30 10:17:50 +000053
54 /* Read product ID */
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000055 id1 = chip_readb(bios);
56 id2 = chip_readb(bios + 0x01);
Markus Boasd2ac6fc2007-08-30 10:17:50 +000057
58 /* Issue JEDEC Product ID Exit command */
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000059 chip_writeb(0xAA, bios + 0x5555);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000060 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000061 chip_writeb(0x55, bios + 0x2AAA);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000062 programmer_delay(10);
Carl-Daniel Hailfinger0472f3d2009-03-06 22:26:00 +000063 chip_writeb(0xF0, bios + 0x5555);
Carl-Daniel Hailfingerca8bfc62009-06-05 17:48:08 +000064 programmer_delay(10);
Markus Boasd2ac6fc2007-08-30 10:17:50 +000065
Sean Nelsoned479d22010-03-24 23:14:32 +000066 msg_cdbg("%s: id1 0x%02x, id2 0x%02x\n", __func__, id1, id2);
Markus Boasd2ac6fc2007-08-30 10:17:50 +000067
68 if (id1 == flash->manufacture_id && id2 == flash->model_id)
69 return 1;
70
71 return 0;
72}