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Root/trunk/en29lv640b.c

1/*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2000 Silicon Integrated System Corporation
5 * Copyright (C) 2012 Rudolf Marek <r.marek@assembler.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "flash.h"
23#include "chipdrivers.h"
24
25/*
26 * WARNING!
27 * This chip uses the standard JEDEC addresses in 16-bit mode as word
28 * addresses. In byte mode, 0xAAA has to be used instead of 0x555 and
29 * 0x555 instead of 0x2AA. Do *not* blindly replace with standard JEDEC
30 * functions.
31 */
32
33/* chunksize is 1 */
34int write_en29lv640b(struct flashctx *flash, const uint8_t *src, unsigned int start, unsigned int len)
35{
36int i;
37chipaddr bios = flash->virtual_memory;
38chipaddr dst = flash->virtual_memory + start;
39
40for (i = 0; i < len; i += 2) {
41chip_writeb(flash, 0xAA, bios + 0xAAA);
42chip_writeb(flash, 0x55, bios + 0x555);
43chip_writeb(flash, 0xA0, bios + 0xAAA);
44
45/* Transfer data from source to destination. */
46chip_writew(flash, (*src) | ((*(src + 1)) << 8 ), dst);
47toggle_ready_jedec(flash, dst);
48#if 0
49/* We only want to print something in the error case. */
50msg_cerr("Value in the flash at address 0x%lx = %#x, want %#x\n",
51 (dst - bios), chip_readb(flash, dst), *src);
52#endif
53dst += 2;
54src += 2;
55}
56
57/* FIXME: Ignore errors for now. */
58return 0;
59}
60
61int probe_en29lv640b(struct flashctx *flash)
62{
63chipaddr bios = flash->virtual_memory;
64uint16_t id1, id2;
65
66chip_writeb(flash, 0xAA, bios + 0xAAA);
67chip_writeb(flash, 0x55, bios + 0x555);
68chip_writeb(flash, 0x90, bios + 0xAAA);
69
70programmer_delay(10);
71
72id1 = chip_readb(flash, bios + 0x200);
73id1 |= (chip_readb(flash, bios) << 8);
74
75id2 = chip_readb(flash, bios + 0x02);
76
77chip_writeb(flash, 0xF0, bios + 0xAAA);
78
79programmer_delay(10);
80
81msg_cdbg("%s: id1 0x%04x, id2 0x%04x\n", __func__, id1, id2);
82
83if (id1 == flash->chip->manufacture_id && id2 == flash->chip->model_id)
84return 1;
85
86return 0;
87}

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