xref: /openbmc/u-boot/env/nand.c (revision cbd2fba1) 
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2000-2010
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * (C) Copyright 2008
7  * Stuart Wood, Lab X Technologies <stuart.wood@labxtechnologies.com>
8  *
9  * (C) Copyright 2004
10  * Jian Zhang, Texas Instruments, jzhang@ti.com.
11  *
12  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13  * Andreas Heppel <aheppel@sysgo.de>
14  */
15 
16 #include <common.h>
17 #include <command.h>
18 #include <environment.h>
19 #include <linux/stddef.h>
20 #include <malloc.h>
21 #include <memalign.h>
22 #include <nand.h>
23 #include <search.h>
24 #include <errno.h>
25 
26 #if defined(CONFIG_CMD_SAVEENV) && defined(CONFIG_CMD_NAND) && \
27 		!defined(CONFIG_SPL_BUILD)
28 #define CMD_SAVEENV
29 #elif defined(CONFIG_ENV_OFFSET_REDUND)
30 #error CONFIG_ENV_OFFSET_REDUND must have CONFIG_CMD_SAVEENV & CONFIG_CMD_NAND
31 #endif
32 
33 #if defined(CONFIG_ENV_SIZE_REDUND) &&	\
34 	(CONFIG_ENV_SIZE_REDUND != CONFIG_ENV_SIZE)
35 #error CONFIG_ENV_SIZE_REDUND should be the same as CONFIG_ENV_SIZE
36 #endif
37 
38 #ifndef CONFIG_ENV_RANGE
39 #define CONFIG_ENV_RANGE	CONFIG_ENV_SIZE
40 #endif
41 
42 #if defined(ENV_IS_EMBEDDED)
43 env_t *env_ptr = &environment;
44 #elif defined(CONFIG_NAND_ENV_DST)
45 env_t *env_ptr = (env_t *)CONFIG_NAND_ENV_DST;
46 #else /* ! ENV_IS_EMBEDDED */
47 env_t *env_ptr;
48 #endif /* ENV_IS_EMBEDDED */
49 
50 DECLARE_GLOBAL_DATA_PTR;
51 
52 /*
53  * This is called before nand_init() so we can't read NAND to
54  * validate env data.
55  *
56  * Mark it OK for now. env_relocate() in env_common.c will call our
57  * relocate function which does the real validation.
58  *
59  * When using a NAND boot image (like sequoia_nand), the environment
60  * can be embedded or attached to the U-Boot image in NAND flash.
61  * This way the SPL loads not only the U-Boot image from NAND but
62  * also the environment.
63  */
64 static int env_nand_init(void)
65 {
66 #if defined(ENV_IS_EMBEDDED) || defined(CONFIG_NAND_ENV_DST)
67 	int crc1_ok = 0, crc2_ok = 0;
68 	env_t *tmp_env1;
69 
70 #ifdef CONFIG_ENV_OFFSET_REDUND
71 	env_t *tmp_env2;
72 
73 	tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE);
74 	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
75 #endif
76 	tmp_env1 = env_ptr;
77 	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
78 
79 	if (!crc1_ok && !crc2_ok) {
80 		gd->env_addr	= 0;
81 		gd->env_valid	= ENV_INVALID;
82 
83 		return 0;
84 	} else if (crc1_ok && !crc2_ok) {
85 		gd->env_valid = ENV_VALID;
86 	}
87 #ifdef CONFIG_ENV_OFFSET_REDUND
88 	else if (!crc1_ok && crc2_ok) {
89 		gd->env_valid = ENV_REDUND;
90 	} else {
91 		/* both ok - check serial */
92 		if (tmp_env1->flags == 255 && tmp_env2->flags == 0)
93 			gd->env_valid = ENV_REDUND;
94 		else if (tmp_env2->flags == 255 && tmp_env1->flags == 0)
95 			gd->env_valid = ENV_VALID;
96 		else if (tmp_env1->flags > tmp_env2->flags)
97 			gd->env_valid = ENV_VALID;
98 		else if (tmp_env2->flags > tmp_env1->flags)
99 			gd->env_valid = ENV_REDUND;
100 		else /* flags are equal - almost impossible */
101 			gd->env_valid = ENV_VALID;
102 	}
103 
104 	if (gd->env_valid == ENV_REDUND)
105 		env_ptr = tmp_env2;
106 	else
107 #endif
108 	if (gd->env_valid == ENV_VALID)
109 		env_ptr = tmp_env1;
110 
111 	gd->env_addr = (ulong)env_ptr->data;
112 
113 #else /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
114 	gd->env_addr	= (ulong)&default_environment[0];
115 	gd->env_valid	= ENV_VALID;
116 #endif /* ENV_IS_EMBEDDED || CONFIG_NAND_ENV_DST */
117 
118 	return 0;
119 }
120 
121 #ifdef CMD_SAVEENV
122 /*
123  * The legacy NAND code saved the environment in the first NAND device i.e.,
124  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
125  */
126 static int writeenv(size_t offset, u_char *buf)
127 {
128 	size_t end = offset + CONFIG_ENV_RANGE;
129 	size_t amount_saved = 0;
130 	size_t blocksize, len;
131 	struct mtd_info *mtd;
132 	u_char *char_ptr;
133 
134 	mtd = get_nand_dev_by_index(0);
135 	if (!mtd)
136 		return 1;
137 
138 	blocksize = mtd->erasesize;
139 	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
140 
141 	while (amount_saved < CONFIG_ENV_SIZE && offset < end) {
142 		if (nand_block_isbad(mtd, offset)) {
143 			offset += blocksize;
144 		} else {
145 			char_ptr = &buf[amount_saved];
146 			if (nand_write(mtd, offset, &len, char_ptr))
147 				return 1;
148 
149 			offset += blocksize;
150 			amount_saved += len;
151 		}
152 	}
153 	if (amount_saved != CONFIG_ENV_SIZE)
154 		return 1;
155 
156 	return 0;
157 }
158 
159 struct nand_env_location {
160 	const char *name;
161 	const nand_erase_options_t erase_opts;
162 };
163 
164 static int erase_and_write_env(const struct nand_env_location *location,
165 		u_char *env_new)
166 {
167 	struct mtd_info *mtd;
168 	int ret = 0;
169 
170 	mtd = get_nand_dev_by_index(0);
171 	if (!mtd)
172 		return 1;
173 
174 	printf("Erasing %s...\n", location->name);
175 	if (nand_erase_opts(mtd, &location->erase_opts))
176 		return 1;
177 
178 	printf("Writing to %s... ", location->name);
179 	ret = writeenv(location->erase_opts.offset, env_new);
180 	puts(ret ? "FAILED!\n" : "OK\n");
181 
182 	return ret;
183 }
184 
185 static int env_nand_save(void)
186 {
187 	int	ret = 0;
188 	ALLOC_CACHE_ALIGN_BUFFER(env_t, env_new, 1);
189 	int	env_idx = 0;
190 	static const struct nand_env_location location[] = {
191 		{
192 			.name = "NAND",
193 			.erase_opts = {
194 				.length = CONFIG_ENV_RANGE,
195 				.offset = CONFIG_ENV_OFFSET,
196 			},
197 		},
198 #ifdef CONFIG_ENV_OFFSET_REDUND
199 		{
200 			.name = "redundant NAND",
201 			.erase_opts = {
202 				.length = CONFIG_ENV_RANGE,
203 				.offset = CONFIG_ENV_OFFSET_REDUND,
204 			},
205 		},
206 #endif
207 	};
208 
209 
210 	if (CONFIG_ENV_RANGE < CONFIG_ENV_SIZE)
211 		return 1;
212 
213 	ret = env_export(env_new);
214 	if (ret)
215 		return ret;
216 
217 #ifdef CONFIG_ENV_OFFSET_REDUND
218 	env_idx = (gd->env_valid == ENV_VALID);
219 #endif
220 
221 	ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
222 #ifdef CONFIG_ENV_OFFSET_REDUND
223 	if (!ret) {
224 		/* preset other copy for next write */
225 		gd->env_valid = gd->env_valid == ENV_REDUND ? ENV_VALID :
226 				ENV_REDUND;
227 		return ret;
228 	}
229 
230 	env_idx = (env_idx + 1) & 1;
231 	ret = erase_and_write_env(&location[env_idx], (u_char *)env_new);
232 	if (!ret)
233 		printf("Warning: primary env write failed,"
234 				" redundancy is lost!\n");
235 #endif
236 
237 	return ret;
238 }
239 #endif /* CMD_SAVEENV */
240 
241 #if defined(CONFIG_SPL_BUILD)
242 static int readenv(size_t offset, u_char *buf)
243 {
244 	return nand_spl_load_image(offset, CONFIG_ENV_SIZE, buf);
245 }
246 #else
247 static int readenv(size_t offset, u_char *buf)
248 {
249 	size_t end = offset + CONFIG_ENV_RANGE;
250 	size_t amount_loaded = 0;
251 	size_t blocksize, len;
252 	struct mtd_info *mtd;
253 	u_char *char_ptr;
254 
255 	mtd = get_nand_dev_by_index(0);
256 	if (!mtd)
257 		return 1;
258 
259 	blocksize = mtd->erasesize;
260 	len = min(blocksize, (size_t)CONFIG_ENV_SIZE);
261 
262 	while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
263 		if (nand_block_isbad(mtd, offset)) {
264 			offset += blocksize;
265 		} else {
266 			char_ptr = &buf[amount_loaded];
267 			if (nand_read_skip_bad(mtd, offset,
268 					       &len, NULL,
269 					       mtd->size, char_ptr))
270 				return 1;
271 
272 			offset += blocksize;
273 			amount_loaded += len;
274 		}
275 	}
276 
277 	if (amount_loaded != CONFIG_ENV_SIZE)
278 		return 1;
279 
280 	return 0;
281 }
282 #endif /* #if defined(CONFIG_SPL_BUILD) */
283 
284 #ifdef CONFIG_ENV_OFFSET_OOB
285 int get_nand_env_oob(struct mtd_info *mtd, unsigned long *result)
286 {
287 	struct mtd_oob_ops ops;
288 	uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
289 	int ret;
290 
291 	ops.datbuf	= NULL;
292 	ops.mode	= MTD_OOB_AUTO;
293 	ops.ooboffs	= 0;
294 	ops.ooblen	= ENV_OFFSET_SIZE;
295 	ops.oobbuf	= (void *)oob_buf;
296 
297 	ret = mtd->read_oob(mtd, ENV_OFFSET_SIZE, &ops);
298 	if (ret) {
299 		printf("error reading OOB block 0\n");
300 		return ret;
301 	}
302 
303 	if (oob_buf[0] == ENV_OOB_MARKER) {
304 		*result = ovoid ob_buf[1] * mtd->erasesize;
305 	} else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
306 		*result = oob_buf[1];
307 	} else {
308 		printf("No dynamic environment marker in OOB block 0\n");
309 		return -ENOENT;
310 	}
311 
312 	return 0;
313 }
314 #endif
315 
316 #ifdef CONFIG_ENV_OFFSET_REDUND
317 static int env_nand_load(void)
318 {
319 #if defined(ENV_IS_EMBEDDED)
320 	return 0;
321 #else
322 	int read1_fail, read2_fail;
323 	env_t *tmp_env1, *tmp_env2;
324 	int ret = 0;
325 
326 	tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE);
327 	tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE);
328 	if (tmp_env1 == NULL || tmp_env2 == NULL) {
329 		puts("Can't allocate buffers for environment\n");
330 		set_default_env("malloc() failed", 0);
331 		ret = -EIO;
332 		goto done;
333 	}
334 
335 	read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
336 	read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);
337 
338 	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
339 				read2_fail);
340 
341 done:
342 	free(tmp_env1);
343 	free(tmp_env2);
344 
345 	return ret;
346 #endif /* ! ENV_IS_EMBEDDED */
347 }
348 #else /* ! CONFIG_ENV_OFFSET_REDUND */
349 /*
350  * The legacy NAND code saved the environment in the first NAND
351  * device i.e., nand_dev_desc + 0. This is also the behaviour using
352  * the new NAND code.
353  */
354 static int env_nand_load(void)
355 {
356 #if !defined(ENV_IS_EMBEDDED)
357 	int ret;
358 	ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
359 
360 #if defined(CONFIG_ENV_OFFSET_OOB)
361 	struct mtd_info *mtd  = get_nand_dev_by_index(0);
362 	/*
363 	 * If unable to read environment offset from NAND OOB then fall through
364 	 * to the normal environment reading code below
365 	 */
366 	if (mtd && !get_nand_env_oob(mtd, &nand_env_oob_offset)) {
367 		printf("Found Environment offset in OOB..\n");
368 	} else {
369 		set_default_env("no env offset in OOB", 0);
370 		return;
371 	}
372 #endif
373 
374 	ret = readenv(CONFIG_ENV_OFFSET, (u_char *)buf);
375 	if (ret) {
376 		set_default_env("readenv() failed", 0);
377 		return -EIO;
378 	}
379 
380 	return env_import(buf, 1);
381 #endif /* ! ENV_IS_EMBEDDED */
382 
383 	return 0;
384 }
385 #endif /* CONFIG_ENV_OFFSET_REDUND */
386 
387 U_BOOT_ENV_LOCATION(nand) = {
388 	.location	= ENVL_NAND,
389 	ENV_NAME("NAND")
390 	.load		= env_nand_load,
391 #if defined(CMD_SAVEENV)
392 	.save		= env_save_ptr(env_nand_save),
393 #endif
394 	.init		= env_nand_init,
395 };
396