1 /*
2 * This file is part of the flashrom project.
3 *
4 * Copyright (C) 2000 Silicon Integrated System Corporation
5 * Copyright (C) 2005 coresystems GmbH <[email protected]>
6 * Copyright (C) 2009 Sean Nelson <[email protected]>
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 #include "flash.h"
20 #include "chipdrivers.h"
21
22 #define AUTO_PG_ERASE1 0x20
23 #define AUTO_PG_ERASE2 0xD0
24 #define AUTO_PGRM 0x10
25 #define CHIP_ERASE 0x30
26 #define RESET 0xFF
27 #define READ_ID 0x90
28
protect_28sf040(struct flashctx * flash)29 int protect_28sf040(struct flashctx *flash)
30 {
31 chipaddr bios = flash->virtual_memory;
32
33 chip_readb(flash, bios + 0x1823);
34 chip_readb(flash, bios + 0x1820);
35 chip_readb(flash, bios + 0x1822);
36 chip_readb(flash, bios + 0x0418);
37 chip_readb(flash, bios + 0x041B);
38 chip_readb(flash, bios + 0x0419);
39 chip_readb(flash, bios + 0x040A);
40
41 return 0;
42 }
43
unprotect_28sf040(struct flashctx * flash)44 int unprotect_28sf040(struct flashctx *flash)
45 {
46 chipaddr bios = flash->virtual_memory;
47
48 chip_readb(flash, bios + 0x1823);
49 chip_readb(flash, bios + 0x1820);
50 chip_readb(flash, bios + 0x1822);
51 chip_readb(flash, bios + 0x0418);
52 chip_readb(flash, bios + 0x041B);
53 chip_readb(flash, bios + 0x0419);
54 chip_readb(flash, bios + 0x041A);
55
56 return 0;
57 }
58
erase_sector_28sf040(struct flashctx * flash,unsigned int address,unsigned int sector_size)59 int erase_sector_28sf040(struct flashctx *flash, unsigned int address,
60 unsigned int sector_size)
61 {
62 chipaddr bios = flash->virtual_memory;
63
64 /* This command sequence is very similar to erase_block_82802ab. */
65 chip_writeb(flash, AUTO_PG_ERASE1, bios);
66 chip_writeb(flash, AUTO_PG_ERASE2, bios + address);
67
68 /* wait for Toggle bit ready */
69 toggle_ready_jedec(flash, bios);
70
71 /* FIXME: Check the status register for errors. */
72 return 0;
73 }
74
75 /* chunksize is 1 */
write_28sf040(struct flashctx * flash,const uint8_t * src,unsigned int start,unsigned int len)76 int write_28sf040(struct flashctx *flash, const uint8_t *src, unsigned int start, unsigned int len)
77 {
78 unsigned int i;
79 chipaddr bios = flash->virtual_memory;
80 chipaddr dst = flash->virtual_memory + start;
81
82 for (i = 0; i < len; i++) {
83 /* transfer data from source to destination */
84 if (*src == 0xFF) {
85 dst++, src++;
86 /* If the data is 0xFF, don't program it */
87 continue;
88 }
89 /*issue AUTO PROGRAM command */
90 chip_writeb(flash, AUTO_PGRM, dst);
91 chip_writeb(flash, *src++, dst++);
92
93 /* wait for Toggle bit ready */
94 toggle_ready_jedec(flash, bios);
95 update_progress(flash, FLASHROM_PROGRESS_WRITE, i + 1, len);
96 }
97
98 return 0;
99 }
100
erase_28sf040(struct flashctx * flash)101 static int erase_28sf040(struct flashctx *flash)
102 {
103 chipaddr bios = flash->virtual_memory;
104
105 chip_writeb(flash, CHIP_ERASE, bios);
106 chip_writeb(flash, CHIP_ERASE, bios);
107
108 programmer_delay(flash, 10);
109 toggle_ready_jedec(flash, bios);
110
111 /* FIXME: Check the status register for errors. */
112 return 0;
113 }
114
erase_chip_28sf040(struct flashctx * flash,unsigned int addr,unsigned int blocklen)115 int erase_chip_28sf040(struct flashctx *flash, unsigned int addr,
116 unsigned int blocklen)
117 {
118 if ((addr != 0) || (blocklen != flash->chip->total_size * 1024)) {
119 msg_cerr("%s called with incorrect arguments\n",
120 __func__);
121 return -1;
122 }
123 return erase_28sf040(flash);
124 }
125