summaryrefslogtreecommitdiff
path: root/env/nand.c
blob: df300b13179312babc6ee3c47e2cba1d165c30fb (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
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2000-2010
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * (C) Copyright 2008
 * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
 *
 * (C) Copyright 2004
 * Jian Zhang, Texas Instruments, jzhang@ti.com.
 *
 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Andreas Heppel <aheppel@sysgo.de>
 */

#include <common.h>
#include <command.h>
#include <env.h>
#include <env_internal.h>
#include <asm/global_data.h>
#include <linux/stddef.h>
#include <malloc.h>
#include <memalign.h>
#include <nand.h>
#include <search.h>
#include <errno.h>
#include <u-boot/crc.h>

#if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND) && \
		!defined(CONFIG_SPL_BUILD)
#define CMD_SAVEENV
#elif defined(CONFIG_ENV_OFFSET_REDUND) && !defined(CONFIG_SPL_BUILD)
#error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
#endif

#if defined(ENV_IS_EMBEDDED)
static env_t *env_ptr = &environment;
#elif defined(CONFIG_NAND_ENV_DST)
static env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
#endif /* ENV_IS_EMBEDDED */

DECLARE_GLOBAL_DATA_PTR;

/*
 * This is called before nand_init() so we can't read NAND to
 * validate env data.
 *
 * Mark it OK for now. env_relocate() in env_common.c will call our
 * relocate function which does the real validation.
 *
 * When using a NAND boot image (like sequoia_nand), the environment
 * can be embedded or attached to the U-Boot image in NAND flash.
 * This way the SPL loads not only the U-Boot image from NAND but
 * also the environment.
 */
static int env_nand_init(void)
{
#if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
	int crc1_ok = 0, crc2_ok = 0;
	env_t *tmp_env1;

#ifdef CONFIG_ENV_OFFSET_REDUND
	env_t *tmp_env2;

	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
#endif
	tmp_env1 = env_ptr;
	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;

	if (!crc1_ok && !crc2_ok) {
		gd->env_addr	= 0;
		gd->env_valid	= ENV_INVALID;

		return 0;
	} else if (crc1_ok && !crc2_ok) {
		gd->env_valid = ENV_VALID;
	}
#ifdef CONFIG_ENV_OFFSET_REDUND
	else if (!crc1_ok && crc2_ok) {
		gd->env_valid = ENV_REDUND;
	} else {
		/* both ok - check serial */
		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
			gd->env_valid = ENV_REDUND;
		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
			gd->env_valid = ENV_VALID;
		else if (tmp_env1->flags > tmp_env2->flags)
			gd->env_valid = ENV_VALID;
		else if (tmp_env2->flags > tmp_env1->flags)
			gd->env_valid = ENV_REDUND;
		else /* flags are equal - almost impossible */
			gd->env_valid = ENV_VALID;
	}

	if (gd->env_valid == ENV_REDUND)
		env_ptr = tmp_env2;
	else
#endif
	if (gd->env_valid == ENV_VALID)
		env_ptr = tmp_env1;

	gd->env_addr = (ulong)env_ptr->data;

#else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
	gd->env_valid	= ENV_INVALID;
#endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */

	return 0;
}

#ifdef CMD_SAVEENV
/*
 * The legacy NAND code saved the environment in the first NAND device i.e.,
 * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 */
static int writeenv(size_t offset, u_char *buf)
{
	size_t end = offset + CONFIG_ENV_RANGE;
	size_t amount_saved = 0;
	size_t blocksize, len;
	struct mtd_info *mtd;
	u_char *char_ptr;

	mtd = get_nand_dev_by_index(0);
	if (!mtd)
		return 1;

	blocksize = mtd->erasesize;
	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);

	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
		if (nand_block_isbad(mtd, offset)) {
			offset += blocksize;
		} else {
			char_ptr = &buf[amount_saved];
			if (nand_write(mtd, offset, &len, char_ptr))
				return 1;

			offset += blocksize;
			amount_saved += len;
		}
	}
	if (amount_saved != CONFIG_ENV_SIZE)
		return 1;

	return 0;
}

struct nand_env_location {
	const char *name;
	const nand_erase_options_t erase_opts;
};

static int erase_and_write_env(const struct nand_env_location *location,
		u_char *env_new)
{
	struct mtd_info *mtd;
	int ret = 0;

	mtd = get_nand_dev_by_index(0);
	if (!mtd)
		return 1;

	printf("Erasing %s...\n", location->name);
	if (nand_erase_opts(mtd, &location->erase_opts))
		return 1;

	printf("Writing to %s... ", location->name);
	ret = writeenv(location->erase_opts.offset, env_new);
	puts(ret ? "FAILED!\n" : "OK\n");

	return ret;
}

static int env_nand_save(void)
{
	int	ret = 0;
	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
	int	env_idx = 0;
	static const struct nand_env_location location[] = {
		{
			.name = "NAND",
			.erase_opts = {
				.length = CONFIG_ENV_RANGE,
				.offset = CONFIG_ENV_OFFSET,
			},
		},
#ifdef CONFIG_ENV_OFFSET_REDUND
		{
			.name = "redundant NAND",
			.erase_opts = {
				.length = CONFIG_ENV_RANGE,
				.offset = CONFIG_ENV_OFFSET_REDUND,
			},
		},
#endif
	};

	ret = env_export(env_new);
	if (ret)
		return ret;

#ifdef CONFIG_ENV_OFFSET_REDUND
	env_idx = (gd->env_valid == ENV_VALID);
#endif

	ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
#ifdef CONFIG_ENV_OFFSET_REDUND
	if (!ret) {
		/* preset other copy for next write */
		gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID :
				ENV_REDUND;
		return ret;
	}

	env_idx = (env_idx + 1) & 1;
	ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
	if (!ret)
		printf("Warning: primary env write failed,"
				" redundancy is lost!\n");
#endif

	return ret;
}
#endif /* CMD_SAVEENV */

#if defined(CONFIG_SPL_BUILD)
static int readenv(size_t offset, u_char *buf)
{
	return nand_spl_load_image(offset, CONFIG_ENV_SIZE, buf);
}
#else
static int readenv(size_t offset, u_char *buf)
{
	size_t end = offset + CONFIG_ENV_RANGE;
	size_t amount_loaded = 0;
	size_t blocksize, len;
	struct mtd_info *mtd;
	u_char *char_ptr;

	mtd = get_nand_dev_by_index(0);
	if (!mtd)
		return 1;

	blocksize = mtd->erasesize;
	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);

	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
		if (nand_block_isbad(mtd, offset)) {
			offset += blocksize;
		} else {
			char_ptr = &buf[amount_loaded];
			if (nand_read_skip_bad(mtd, offset,
					       &len, NULL,
					       mtd->size, char_ptr))
				return 1;

			offset += blocksize;
			amount_loaded += len;
		}
	}

	if (amount_loaded != CONFIG_ENV_SIZE)
		return 1;

	return 0;
}
#endif /* #if defined(CONFIG_SPL_BUILD) */

#ifdef CONFIG_ENV_OFFSET_OOB
int get_nand_env_oob(struct mtd_info *mtd, unsigned long *result)
{
	struct mtd_oob_ops ops;
	uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
	int ret;

	ops.datbuf	= NULL;
	ops.mode	= MTD_OOB_AUTO;
	ops.ooboffs	= 0;
	ops.ooblen	= ENV_OFFSET_SIZE;
	ops.oobbuf	= (void *)oob_buf;

	ret = mtd->read_oob(mtd, ENV_OFFSET_SIZE, &ops);
	if (ret) {
		printf("error reading OOB block 0\n");
		return ret;
	}

	if (oob_buf[0] == ENV_OOB_MARKER) {
		*result = ovoid ob_buf[1] * mtd->erasesize;
	} else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
		*result = oob_buf[1];
	} else {
		printf("No dynamic environment marker in OOB block 0\n");
		return -ENOENT;
	}

	return 0;
}
#endif

#ifdef CONFIG_ENV_OFFSET_REDUND
static int env_nand_load(void)
{
#if defined(ENV_IS_EMBEDDED)
	return 0;
#else
	int read1_fail, read2_fail;
	env_t *tmp_env1, *tmp_env2;
	int ret = 0;

	tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
	tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
	if (tmp_env1 == NULL || tmp_env2 == NULL) {
		puts("Can't allocate buffers for environment\n");
		env_set_default("malloc() failed", 0);
		ret = -EIO;
		goto done;
	}

	read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
	read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);

	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
				read2_fail, H_EXTERNAL);

done:
	free(tmp_env1);
	free(tmp_env2);

	return ret;
#endif /* ! ENV_IS_EMBEDDED */
}
#else /* ! CONFIG_ENV_OFFSET_REDUND */
/*
 * The legacy NAND code saved the environment in the first NAND
 * device i.e., nand_dev_desc + 0. This is also the behaviour using
 * the new NAND code.
 */
static int env_nand_load(void)
{
#if !defined(ENV_IS_EMBEDDED)
	int ret;
	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);

#if defined(CONFIG_ENV_OFFSET_OOB)
	struct mtd_info *mtd  = get_nand_dev_by_index(0);
	/*
	 * If unable to read environment offset from NAND OOB then fall through
	 * to the normal environment reading code below
	 */
	if (mtd && !get_nand_env_oob(mtd, &nand_env_oob_offset)) {
		printf("Found Environment offset in OOB..\n");
	} else {
		env_set_default("no env offset in OOB", 0);
		return;
	}
#endif

	ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
	if (ret) {
		env_set_default("readenv() failed", 0);
		return -EIO;
	}

	return env_import(buf, 1, H_EXTERNAL);
#endif /* ! ENV_IS_EMBEDDED */

	return 0;
}
#endif /* CONFIG_ENV_OFFSET_REDUND */

U_BOOT_ENV_LOCATION(nand) = {
	.location	= ENVL_NAND,
	ENV_NAME("NAND")
	.load		= env_nand_load,
#if defined(CMD_SAVEENV)
	.save		= env_save_ptr(env_nand_save),
#endif
	.init		= env_nand_init,
};