aboutsummaryrefslogtreecommitdiff
path: root/drivers/mtd/mtd_uboot.c
blob: 90767ec417aaf083a58ac42487b6ee092bef7c3d (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
383
384
385
386
387
388
389
390
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2014
 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
 */
#include <common.h>
#include <env.h>
#include <log.h>
#include <malloc.h>
#include <dm/device.h>
#include <dm/uclass-internal.h>
#include <dm/uclass.h>
#include <linux/err.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <asm/global_data.h>
#include <mtd.h>

#define MTD_NAME_MAX_LEN 20

void board_mtdparts_default(const char **mtdids, const char **mtdparts);

static const char *get_mtdids(void)
{
	__maybe_unused const char *mtdparts = NULL;
	const char *mtdids = env_get("mtdids");

	if (mtdids)
		return mtdids;

#if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
	board_mtdparts_default(&mtdids, &mtdparts);
#elif defined(MTDIDS_DEFAULT)
	mtdids = MTDIDS_DEFAULT;
#elif defined(CONFIG_MTDIDS_DEFAULT)
	mtdids = CONFIG_MTDIDS_DEFAULT;
#endif

	if (mtdids)
		env_set("mtdids", mtdids);

	return mtdids;
}

/**
 * mtd_search_alternate_name - Search an alternate name for @mtdname thanks to
 *                             the mtdids legacy environment variable.
 *
 * The mtdids string is a list of comma-separated 'dev_id=mtd_id' tupples.
 * Check if one of the mtd_id matches mtdname, in this case save dev_id in
 * altname.
 *
 * @mtdname: Current MTD device name
 * @altname: Alternate name to return
 * @max_len: Length of the alternate name buffer
 *
 * @return 0 on success, an error otherwise.
 */
int mtd_search_alternate_name(const char *mtdname, char *altname,
			      unsigned int max_len)
{
	const char *mtdids, *equal, *comma, *dev_id, *mtd_id;
	int dev_id_len, mtd_id_len;

	mtdids = get_mtdids();
	if (!mtdids)
		return -EINVAL;

	do {
		/* Find the '=' sign */
		dev_id = mtdids;
		equal = strchr(dev_id, '=');
		if (!equal)
			break;
		dev_id_len = equal - mtdids;
		mtd_id = equal + 1;

		/* Find the end of the tupple */
		comma = strchr(mtdids, ',');
		if (comma)
			mtd_id_len = comma - mtd_id;
		else
			mtd_id_len = &mtdids[strlen(mtdids)] - mtd_id + 1;

		if (!dev_id_len || !mtd_id_len)
			return -EINVAL;

		if (dev_id_len + 1 > max_len)
			continue;

		/* Compare the name we search with the current mtd_id */
		if (!strncmp(mtdname, mtd_id, mtd_id_len)) {
			strncpy(altname, dev_id, dev_id_len);
			altname[dev_id_len] = 0;

			return 0;
		}

		/* Go to the next tupple */
		mtdids = comma + 1;
	} while (comma);

	return -EINVAL;
}

#if IS_ENABLED(CONFIG_DM_MTD)
static void mtd_probe_uclass_mtd_devs(void)
{
	struct udevice *dev;

	uclass_foreach_dev_probe(UCLASS_MTD, dev)
		;
}
#else
static void mtd_probe_uclass_mtd_devs(void) { }
#endif

#if IS_ENABLED(CONFIG_DM_SPI_FLASH) && IS_ENABLED(CONFIG_SPI_FLASH_MTD)
static void mtd_probe_uclass_spi_nor_devs(void)
{
	struct udevice *dev;

	uclass_foreach_dev_probe(UCLASS_SPI_FLASH, dev)
		;
}
#else
static void mtd_probe_uclass_spi_nor_devs(void) { }
#endif

#if defined(CONFIG_MTD_PARTITIONS)

#define MTDPARTS_MAXLEN         512

static const char *get_mtdparts(void)
{
	__maybe_unused const char *mtdids = NULL;
	static char tmp_parts[MTDPARTS_MAXLEN];
	const char *mtdparts = NULL;

	if (gd->flags & GD_FLG_ENV_READY)
		mtdparts = env_get("mtdparts");
	else if (env_get_f("mtdparts", tmp_parts, sizeof(tmp_parts)) != -1)
		mtdparts = tmp_parts;

	if (mtdparts)
		return mtdparts;

#if defined(CONFIG_SYS_MTDPARTS_RUNTIME)
	board_mtdparts_default(&mtdids, &mtdparts);
#elif defined(MTDPARTS_DEFAULT)
	mtdparts = MTDPARTS_DEFAULT;
#elif defined(CONFIG_MTDPARTS_DEFAULT)
	mtdparts = CONFIG_MTDPARTS_DEFAULT;
#endif

	if (mtdparts)
		env_set("mtdparts", mtdparts);

	return mtdparts;
}

static int mtd_del_parts(struct mtd_info *mtd, bool quiet)
{
	int ret;

	if (!mtd_has_partitions(mtd))
		return 0;

	/* do not delete partitions if they are in use. */
	if (mtd_partitions_used(mtd)) {
		if (!quiet)
			printf("\"%s\" partitions still in use, can't delete them\n",
			       mtd->name);
		return -EACCES;
	}

	ret = del_mtd_partitions(mtd);
	if (ret)
		return ret;

	return 1;
}

static bool mtd_del_all_parts_failed;

static void mtd_del_all_parts(void)
{
	struct mtd_info *mtd;
	int ret = 0;

	mtd_del_all_parts_failed = false;

	/*
	 * It is not safe to remove entries from the mtd_for_each_device loop
	 * as it uses idr indexes and the partitions removal is done in bulk
	 * (all partitions of one device at the same time), so break and
	 * iterate from start each time a new partition is found and deleted.
	 */
	do {
		mtd_for_each_device(mtd) {
			ret = mtd_del_parts(mtd, false);
			if (ret > 0)
				break;
			else if (ret < 0)
				mtd_del_all_parts_failed = true;
		}
	} while (ret > 0);
}

static int parse_mtdparts(const char *mtdparts, const char *mtdids)
{
	const char *mtdparts_next;
	struct mtd_info *mtd;

	/* Start the parsing by ignoring the extra 'mtdparts=' prefix, if any */
	if (!strncmp(mtdparts, "mtdparts=", sizeof("mtdparts=") - 1))
		mtdparts += 9;

	/* For each MTD device in mtdparts */
	for (; mtdparts[0] != '\0'; mtdparts = mtdparts_next) {
		char mtd_name[MTD_NAME_MAX_LEN], *colon;
		struct mtd_partition *parts;
		unsigned int mtd_name_len;
		int nparts, ret;

		mtdparts_next = strchr(mtdparts, ';');
		if (!mtdparts_next)
			mtdparts_next = mtdparts + strlen(mtdparts);
		else
			mtdparts_next++;

		colon = strchr(mtdparts, ':');
		if (colon > mtdparts_next)
			colon = NULL;

		if (!colon) {
			printf("Wrong mtdparts: %s\n", mtdparts);
			return -EINVAL;
		}

		mtd_name_len = (unsigned int)(colon - mtdparts);
		if (mtd_name_len + 1 > sizeof(mtd_name)) {
			printf("MTD name too long: %s\n", mtdparts);
			return -EINVAL;
		}

		strncpy(mtd_name, mtdparts, mtd_name_len);
		mtd_name[mtd_name_len] = '\0';
		/* Move the pointer forward (including the ':') */
		mtdparts += mtd_name_len + 1;
		mtd = get_mtd_device_nm(mtd_name);
		if (IS_ERR_OR_NULL(mtd)) {
			char linux_name[MTD_NAME_MAX_LEN];

			/*
			 * The MTD device named "mtd_name" does not exist. Try
			 * to find a correspondance with an MTD device having
			 * the same type and number as defined in the mtdids.
			 */
			debug("No device named %s\n", mtd_name);
			ret = mtd_search_alternate_name(mtd_name, linux_name,
							MTD_NAME_MAX_LEN);
			if (!ret)
				mtd = get_mtd_device_nm(linux_name);

			/*
			 * If no device could be found, move the mtdparts
			 * pointer forward until the next set of partitions.
			 */
			if (ret || IS_ERR_OR_NULL(mtd)) {
				printf("Could not find a valid device for %s\n",
				       mtd_name);
				mtdparts = mtdparts_next;
				continue;
			}
		}

		/*
		 * Call mtd_del_parts() again, even if it's already been called
		 * in mtd_del_all_parts(). We need to know if old partitions are
		 * still around (because they are still being used by someone),
		 * and if they are, we shouldn't create new partitions, so just
		 * skip this MTD device and try the next one.
		 */
		ret = mtd_del_parts(mtd, true);
		if (ret < 0)
			continue;

		/*
		 * Parse the MTD device partitions. It will update the mtdparts
		 * pointer, create an array of parts (that must be freed), and
		 * return the number of partition structures in the array.
		 */
		ret = mtd_parse_partitions(mtd, &mtdparts, &parts, &nparts);
		if (ret) {
			printf("Could not parse device %s\n", mtd->name);
			put_mtd_device(mtd);
			return -EINVAL;
		}

		if (!nparts)
			continue;

		/* Create the new MTD partitions */
		add_mtd_partitions(mtd, parts, nparts);

		/* Free the structures allocated during the parsing */
		mtd_free_parsed_partitions(parts, nparts);

		put_mtd_device(mtd);
	}

	return 0;
}

int mtd_probe_devices(void)
{
	static char *old_mtdparts;
	static char *old_mtdids;
	const char *mtdparts = get_mtdparts();
	const char *mtdids = get_mtdids();
	struct mtd_info *mtd;

	mtd_probe_uclass_mtd_devs();
	mtd_probe_uclass_spi_nor_devs();

	/*
	 * Check if mtdparts/mtdids changed, if the MTD dev list was updated
	 * or if our previous attempt to delete existing partititions failed.
	 * In any of these cases we want to update the partitions, otherwise,
	 * everything is up-to-date and we can return 0 directly.
	 */
	if ((!mtdparts && !old_mtdparts && !mtdids && !old_mtdids) ||
	    (mtdparts && old_mtdparts && mtdids && old_mtdids &&
	     !mtd_dev_list_updated() && !mtd_del_all_parts_failed &&
	     !strcmp(mtdparts, old_mtdparts) &&
	     !strcmp(mtdids, old_mtdids)))
		return 0;

	/* Update the local copy of mtdparts */
	free(old_mtdparts);
	free(old_mtdids);
	old_mtdparts = strdup(mtdparts);
	old_mtdids = strdup(mtdids);

	/*
	 * Remove all old parts. Note that partition removal can fail in case
	 * one of the partition is still being used by an MTD user, so this
	 * does not guarantee that all old partitions are gone.
	 */
	mtd_del_all_parts();

	/*
	 * Call mtd_dev_list_updated() to clear updates generated by our own
	 * parts removal loop.
	 */
	mtd_dev_list_updated();

	/* If both mtdparts and mtdids are non-empty, parse */
	if (mtdparts && mtdids) {
		if (parse_mtdparts(mtdparts, mtdids) < 0)
			printf("Failed parsing MTD partitions from mtdparts!\n");
	}

	/* Fallback to OF partitions */
	mtd_for_each_device(mtd) {
		if (list_empty(&mtd->partitions)) {
			if (add_mtd_partitions_of(mtd) < 0)
				printf("Failed parsing MTD %s OF partitions!\n",
					mtd->name);
		}
	}

	/*
	 * Call mtd_dev_list_updated() to clear updates generated by our own
	 * parts registration loop.
	 */
	mtd_dev_list_updated();

	return 0;
}
#else
int mtd_probe_devices(void)
{
	mtd_probe_uclass_mtd_devs();
	mtd_probe_uclass_spi_nor_devs();

	return 0;
}
#endif /* defined(CONFIG_MTD_PARTITIONS) */