summaryrefslogtreecommitdiff
path: root/util/flashrom/82802ab.c
blob: 53930eec65fb6360f05fb8608e113b026773df56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/*
 * 82802ab.c: driver for programming JEDEC standard flash parts
 *
 *
 * Copyright 2000 Silicon Integrated System Corporation
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * Reference: http://www.intel.com/design/chipsets/datashts/290658.htm
 *
 */

#include <stdio.h>
#include <stdint.h>

#include "flash.h"
#include "82802ab.h"
#include "debug.h"

// I need that Berkeley bit-map printer
void print_82802ab_status(uint8_t status)
{
	printf("%s", status & 0x80 ? "Ready:" : "Busy:");
	printf("%s", status & 0x40 ? "BE SUSPEND:" : "BE RUN/FINISH:");
	printf("%s", status & 0x20 ? "BE ERROR:" : "BE OK:");
	printf("%s", status & 0x10 ? "PROG ERR:" : "PROG OK:");
	printf("%s", status & 0x8 ? "VP ERR:" : "VPP OK:");
	printf("%s", status & 0x4 ? "PROG SUSPEND:" : "PROG RUN/FINISH:");
	printf("%s", status & 0x2 ? "WP|TBL#|WP#,ABORT:" : "UNLOCK:");
}

int probe_82802ab(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virtual_memory;
	uint8_t id1, id2;

#if 0
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	*(volatile uint8_t *)(bios + 0x5555) = 0x90;
#endif

	*bios = 0xff;
	myusec_delay(10);
	*bios = 0x90;
	myusec_delay(10);

	id1 = *(volatile uint8_t *)bios;
	id2 = *(volatile uint8_t *)(bios + 0x01);

	/* Leave ID mode */
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;

	myusec_delay(10);

	printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);

	if (id1 != flash->manufacture_id || id2 != flash->model_id)
		return 0;

	map_flash_registers(flash);

	return 1;
}

uint8_t wait_82802ab(volatile uint8_t *bios)
{

	uint8_t status;
	uint8_t id1, id2;

	*bios = 0x70;
	if ((*bios & 0x80) == 0) {	// it's busy
		while ((*bios & 0x80) == 0) ;
	}

	status = *bios;

	// put another command to get out of status register mode

	*bios = 0x90;
	myusec_delay(10);

	id1 = *(volatile uint8_t *)bios;
	id2 = *(volatile uint8_t *)(bios + 0x01);

	// this is needed to jam it out of "read id" mode
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
	return status;

}
int erase_82802ab_block(struct flashchip *flash, int offset)
{
	volatile uint8_t *bios = flash->virtual_memory + offset;
	volatile uint8_t *wrprotect = flash->virtual_registers + offset + 2;
	uint8_t status;

	// clear status register
	*bios = 0x50;
	//printf("Erase at %p\n", bios);
	// clear write protect
	//printf("write protect is at %p\n", (wrprotect));
	//printf("write protect is 0x%x\n", *(wrprotect));
	*(wrprotect) = 0;
	//printf("write protect is 0x%x\n", *(wrprotect));

	// now start it
	*(volatile uint8_t *)(bios) = 0x20;
	*(volatile uint8_t *)(bios) = 0xd0;
	myusec_delay(10);
	// now let's see what the register is
	status = wait_82802ab(flash->virtual_memory);
	//print_82802ab_status(status);
	printf("DONE BLOCK 0x%x\n", offset);
	return (0);
}
int erase_82802ab(struct flashchip *flash)
{
	int i;
	unsigned int total_size = flash->total_size * 1024;

	printf("total_size is %d; flash->page_size is %d\n",
	       total_size, flash->page_size);
	for (i = 0; i < total_size; i += flash->page_size)
		erase_82802ab_block(flash, i);
	printf("DONE ERASE\n");
	return (0);
}

void write_page_82802ab(volatile uint8_t *bios, uint8_t *src,
			volatile uint8_t *dst, int page_size)
{
	int i;

	for (i = 0; i < page_size; i++) {
		/* transfer data from source to destination */
		*dst = 0x40;
		*dst++ = *src++;
		wait_82802ab(bios);
	}

}

int write_82802ab(struct flashchip *flash, uint8_t *buf)
{
	int i;
	int total_size = flash->total_size * 1024;
	int page_size = flash->page_size;
	volatile uint8_t *bios = flash->virtual_memory;

	erase_82802ab(flash);
	if (*bios != 0xff) {
		printf("ERASE FAILED\n");
		return -1;
	}
	printf("Programming Page: ");
	for (i = 0; i < total_size / page_size; i++) {
		printf("%04d at address: 0x%08x", i, i * page_size);
		write_page_82802ab(bios, buf + i * page_size,
				   bios + i * page_size, page_size);
		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
	}
	printf("\n");
	protect_82802ab(bios);
	return (0);
}