summaryrefslogtreecommitdiffstats
path: root/stm50flw0x0x.c
blob: c06bab97914541122d114209e8c7137d854f9496 (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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2008 Claus Gindhart <claus.gindhart@kontron.com>
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

/*
 * This module is designed for supporting the devices
 * ST M50FLW040A (not yet tested)
 * ST M50FLW040B (not yet tested)
 * ST M50FLW080A
 * ST M50FLW080B (not yet tested)
 */

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "flash.h"

void protect_stm50flw0x0x(volatile uint8_t *bios)
{
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	*(volatile uint8_t *)(bios + 0x5555) = 0xA0;

	usleep(200);
}

int probe_stm50flw0x0x(struct flashchip *flash)
{
	volatile uint8_t *bios = flash->virtual_memory;
	uint8_t id1, id2;
	uint32_t largeid1, largeid2;

	/* Issue JEDEC Product ID Entry command */
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x5555) = 0x90;
	myusec_delay(40);

	/* Read product ID */
	id1 = *(volatile uint8_t *)bios;
	id2 = *(volatile uint8_t *)(bios + 0x01);
	largeid1 = id1;
	largeid2 = id2;

	/* Check if it is a continuation ID, this should be a while loop. */
	if (id1 == 0x7F) {
		largeid1 <<= 8;
		id1 = *(volatile uint8_t *)(bios + 0x100);
		largeid1 |= id1;
	}
	if (id2 == 0x7F) {
		largeid2 <<= 8;
		id2 = *(volatile uint8_t *)(bios + 0x101);
		largeid2 |= id2;
	}

	/* Issue JEDEC Product ID Exit command */
	*(volatile uint8_t *)(bios + 0x5555) = 0xAA;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x2AAA) = 0x55;
	myusec_delay(10);
	*(volatile uint8_t *)(bios + 0x5555) = 0xF0;
	myusec_delay(40);

	printf_debug("%s: id1 0x%02x, id2 0x%02x\n", __FUNCTION__, largeid1,
		     largeid2);

	if (largeid1 != flash->manufacture_id || largeid2 != flash->model_id)
		return 0;

	map_flash_registers(flash);

	return 1;
}

static void wait_stm50flw0x0x(volatile uint8_t *bios)
{
	uint8_t id1;
	// id2;

	*bios = 0x70;
	if ((*bios & 0x80) == 0) {	// it's busy
		while ((*bios & 0x80) == 0) ;
	}
	// put another command to get out of status register mode

	*bios = 0x90;
	myusec_delay(10);

	id1 = *(volatile uint8_t *)bios;

	// 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;
}

/*
 * claus.gindhart@kontron.com
 * The ST M50FLW080B and STM50FLW080B chips have to be unlocked,
 * before you can erase them or write to them.
 */
int unlock_block_stm50flw0x0x(struct flashchip *flash, int offset)
{
	volatile uint8_t *flash_addr = flash->virtual_registers + 2;
	const uint8_t unlock_sector = 0x00;
	int j;

	/*
	 * These chips have to be unlocked before you can erase them or write
	 * to them. The size of the locking sectors depends on the type
	 * of chip.
	 *
	 * Sometimes, the BIOS does this for you; so you propably
	 * don't need to worry about that.
	 */

	/* Check, if it's is a top/bottom-block with 4k-sectors. */
	/* TODO: What about the other types? */
	if ((offset == 0) ||
	    (offset == (flash->model_id == ST_M50FLW080A ? 0xE0000 : 0x10000))
	    || (offset == 0xF0000)) {

		// unlock each 4k-sector
		for (j = 0; j < 0x10000; j += 0x1000) {
			printf_debug("unlocking at 0x%x\n", offset + j);
			*(flash_addr + offset + j) = unlock_sector;
			if (*(flash_addr + offset + j) != unlock_sector) {
				printf("Cannot unlock sector @ 0x%x\n",
				       offset + j);
				return -1;
			}
		}
	} else {
		printf_debug("unlocking at 0x%x\n", offset);
		*(flash_addr + offset) = unlock_sector;
		if (*(flash_addr + offset) != unlock_sector) {
			printf("Cannot unlock sector @ 0x%x\n", offset);
			return -1;
		}
	}

	return 0;
}

int erase_block_stm50flw0x0x(struct flashchip *flash, int offset)
{
	volatile uint8_t *bios = flash->virtual_memory + offset;
	int j;

	// clear status register
	*bios = 0x50;
	printf_debug("Erase at %p\n", bios);
	// now start it
	*(volatile uint8_t *)(bios) = 0x20;
	*(volatile uint8_t *)(bios) = 0xd0;
	myusec_delay(10);

	wait_stm50flw0x0x(flash->virtual_memory);

	for (j = 0; j < flash->page_size; j++) {
		if (*(bios + j) != 0xFF) {
			printf("Erase failed at 0x%x\n", offset + j);
			return -1;
		}
	}

	printf("DONE BLOCK 0x%x\n", offset);

	return 0;
}

int write_page_stm50flw0x0x(volatile uint8_t *bios, uint8_t *src,
			    volatile uint8_t *dst, int page_size)
{
	int i, rc = 0;
	volatile uint8_t *d = dst;
	uint8_t *s = src;

	/* transfer data from source to destination */
	for (i = 0; i < page_size; i++) {
		*dst = 0x40;
		*dst++ = *src++;
		wait_stm50flw0x0x(bios);
	}

/* claus.gindhart@kontron.com
 * TODO
 * I think, that verification is not required, but
 * i leave it in anyway
 */
	dst = d;
	src = s;
	for (i = 0; i < page_size; i++) {
		if (*dst != *src) {
			rc = -1;
			break;
		}
		dst++;
		src++;
	}

	if (rc) {
		fprintf(stderr, " page %d failed!\n",
			(unsigned int)(d - bios) / page_size);
	}

	return rc;
}

/* I simply erase block by block
 * I Chip This is not the fastest way, but it works
 */
int erase_stm50flw0x0x(struct flashchip *flash)
{
	int i, rc = 0;
	int total_size = flash->total_size * 1024;
	int page_size = flash->page_size;
	volatile uint8_t *bios = flash->virtual_memory;

	printf("Erasing page:\n");
	for (i = 0; (i < total_size / page_size) && (rc == 0); i++) {
		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("%04d at address: 0x%08x ", i, i * page_size);
		rc = unlock_block_stm50flw0x0x(flash, i * page_size);
		if (!rc)
			rc = erase_block_stm50flw0x0x(flash, i * page_size);
	}
	printf("\n");
	protect_stm50flw0x0x(bios);

	return rc;
}

int write_stm50flw0x0x(struct flashchip *flash, uint8_t * buf)
{
	int i, rc = 0;
	int total_size = flash->total_size * 1024;
	int page_size = flash->page_size;
	volatile uint8_t *bios = flash->virtual_memory;

	printf("Programming page: \n");
	for (i = 0; (i < total_size / page_size) && (rc == 0); i++) {
		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("%04d at address: 0x%08x ", i, i * page_size);

		/* Auto Skip Blocks, which already contain the desired data
		 * Faster, because we only write, what has changed
		 * More secure, because blocks, which are excluded
		 * (with the exclude or layout feature)
		 * are not erased and rewritten; data is retained also
		 * in sudden power off situations
		 */
		if (!memcmp((void *)(buf + i * page_size),
			    (void *)(bios + i * page_size), page_size)) {
			printf("SKIPPED\n");
			continue;
		}

		rc = unlock_block_stm50flw0x0x(flash, i * page_size);
		if (!rc)
			rc = erase_block_stm50flw0x0x(flash, i * page_size);
		if (!rc)
			write_page_stm50flw0x0x(bios, buf + i * page_size,
					bios + i * page_size, page_size);
	}
	printf("\n");
	protect_stm50flw0x0x(bios);

	return rc;
}
OpenPOWER on IntegriCloud