summaryrefslogtreecommitdiff
path: root/drivers/mtd/nand/nand_util.c
blob: 61bf7e6847fc3a50b7636bc87b770f028b8a9a60 (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
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
/*
 * drivers/mtd/nand/nand_util.c
 *
 * Copyright (C) 2006 by Weiss-Electronic GmbH.
 * All rights reserved.
 *
 * @author:	Guido Classen <clagix@gmail.com>
 * @descr:	NAND Flash support
 * @references: borrowed heavily from Linux mtd-utils code:
 *		flash_eraseall.c by Arcom Control System Ltd
 *		nandwrite.c by Steven J. Hill (sjhill@realitydiluted.com)
 *			       and Thomas Gleixner (tglx@linutronix.de)
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <common.h>
#include <command.h>
#include <watchdog.h>
#include <malloc.h>
#include <div64.h>

#include <asm/errno.h>
#include <linux/mtd/mtd.h>
#include <nand.h>
#include <jffs2/jffs2.h>

#if !defined(CONFIG_SYS_64BIT_VSPRINTF)
#warning Please define CONFIG_SYS_64BIT_VSPRINTF for correct output!
#endif

typedef struct erase_info erase_info_t;
typedef struct mtd_info	  mtd_info_t;

/* support only for native endian JFFS2 */
#define cpu_to_je16(x) (x)
#define cpu_to_je32(x) (x)

/*****************************************************************************/
static int nand_block_bad_scrub(struct mtd_info *mtd, loff_t ofs, int getchip)
{
	return 0;
}

/**
 * nand_erase_opts: - erase NAND flash with support for various options
 *		      (jffs2 formating)
 *
 * @param meminfo	NAND device to erase
 * @param opts		options,  @see struct nand_erase_options
 * @return		0 in case of success
 *
 * This code is ported from flash_eraseall.c from Linux mtd utils by
 * Arcom Control System Ltd.
 */
int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
{
	struct jffs2_unknown_node cleanmarker;
	erase_info_t erase;
	ulong erase_length;
	int bbtest = 1;
	int result;
	int percent_complete = -1;
	int (*nand_block_bad_old)(struct mtd_info *, loff_t, int) = NULL;
	const char *mtd_device = meminfo->name;
	struct mtd_oob_ops oob_opts;
	struct nand_chip *chip = meminfo->priv;

	memset(&erase, 0, sizeof(erase));
	memset(&oob_opts, 0, sizeof(oob_opts));

	erase.mtd = meminfo;
	erase.len  = meminfo->erasesize;
	erase.addr = opts->offset;
	erase_length = opts->length;

	cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
	cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
	cleanmarker.totlen = cpu_to_je32(8);

	/* scrub option allows to erase badblock. To prevent internal
	 * check from erase() method, set block check method to dummy
	 * and disable bad block table while erasing.
	 */
	if (opts->scrub) {
		struct nand_chip *priv_nand = meminfo->priv;

		nand_block_bad_old = priv_nand->block_bad;
		priv_nand->block_bad = nand_block_bad_scrub;
		/* we don't need the bad block table anymore...
		 * after scrub, there are no bad blocks left!
		 */
		if (priv_nand->bbt) {
			kfree(priv_nand->bbt);
		}
		priv_nand->bbt = NULL;
	}

	if (erase_length < meminfo->erasesize) {
		printf("Warning: Erase size 0x%08lx smaller than one "	\
		       "erase block 0x%08x\n",erase_length, meminfo->erasesize);
		printf("         Erasing 0x%08x instead\n", meminfo->erasesize);
		erase_length = meminfo->erasesize;
	}

	for (;
	     erase.addr < opts->offset + erase_length;
	     erase.addr += meminfo->erasesize) {

		WATCHDOG_RESET ();

		if (!opts->scrub && bbtest) {
			int ret = meminfo->block_isbad(meminfo, erase.addr);
			if (ret > 0) {
				if (!opts->quiet)
					printf("\rSkipping bad block at  "
					       "0x%08llx                 "
					       "                         \n",
					       erase.addr);
				continue;

			} else if (ret < 0) {
				printf("\n%s: MTD get bad block failed: %d\n",
				       mtd_device,
				       ret);
				return -1;
			}
		}

		result = meminfo->erase(meminfo, &erase);
		if (result != 0) {
			printf("\n%s: MTD Erase failure: %d\n",
			       mtd_device, result);
			continue;
		}

		/* format for JFFS2 ? */
		if (opts->jffs2 && chip->ecc.layout->oobavail >= 8) {
			chip->ops.ooblen = 8;
			chip->ops.datbuf = NULL;
			chip->ops.oobbuf = (uint8_t *)&cleanmarker;
			chip->ops.ooboffs = 0;
			chip->ops.mode = MTD_OOB_AUTO;

			result = meminfo->write_oob(meminfo,
			                            erase.addr,
			                            &chip->ops);
			if (result != 0) {
				printf("\n%s: MTD writeoob failure: %d\n",
				       mtd_device, result);
				continue;
			}
		}

		if (!opts->quiet) {
			unsigned long long n =(unsigned long long)
				(erase.addr + meminfo->erasesize - opts->offset)
				* 100;
			int percent;

			do_div(n, erase_length);
			percent = (int)n;

			/* output progress message only at whole percent
			 * steps to reduce the number of messages printed
			 * on (slow) serial consoles
			 */
			if (percent != percent_complete) {
				percent_complete = percent;

				printf("\rErasing at 0x%llx -- %3d%% complete.",
				       erase.addr, percent);

				if (opts->jffs2 && result == 0)
					printf(" Cleanmarker written at 0x%llx.",
					       erase.addr);
			}
		}
	}
	if (!opts->quiet)
		printf("\n");

	if (nand_block_bad_old) {
		struct nand_chip *priv_nand = meminfo->priv;

		priv_nand->block_bad = nand_block_bad_old;
		priv_nand->scan_bbt(meminfo);
	}

	return 0;
}

/* XXX U-BOOT XXX */
#if 0

#define MAX_PAGE_SIZE	2048
#define MAX_OOB_SIZE	64

/*
 * buffer array used for writing data
 */
static unsigned char data_buf[MAX_PAGE_SIZE];
static unsigned char oob_buf[MAX_OOB_SIZE];

/* OOB layouts to pass into the kernel as default */
static struct nand_ecclayout none_ecclayout = {
	.useecc = MTD_NANDECC_OFF,
};

static struct nand_ecclayout jffs2_ecclayout = {
	.useecc = MTD_NANDECC_PLACE,
	.eccbytes = 6,
	.eccpos = { 0, 1, 2, 3, 6, 7 }
};

static struct nand_ecclayout yaffs_ecclayout = {
	.useecc = MTD_NANDECC_PLACE,
	.eccbytes = 6,
	.eccpos = { 8, 9, 10, 13, 14, 15}
};

static struct nand_ecclayout autoplace_ecclayout = {
	.useecc = MTD_NANDECC_AUTOPLACE
};
#endif

/* XXX U-BOOT XXX */
#ifdef CONFIG_CMD_NAND_LOCK_UNLOCK

/******************************************************************************
 * Support for locking / unlocking operations of some NAND devices
 *****************************************************************************/

#define NAND_CMD_LOCK		0x2a
#define NAND_CMD_LOCK_TIGHT	0x2c
#define NAND_CMD_UNLOCK1	0x23
#define NAND_CMD_UNLOCK2	0x24
#define NAND_CMD_LOCK_STATUS	0x7a

/**
 * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
 *	      state
 *
 * @param mtd		nand mtd instance
 * @param tight		bring device in lock tight mode
 *
 * @return		0 on success, -1 in case of error
 *
 * The lock / lock-tight command only applies to the whole chip. To get some
 * parts of the chip lock and others unlocked use the following sequence:
 *
 * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
 * - Call nand_unlock() once for each consecutive area to be unlocked
 * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
 *
 *   If the device is in lock-tight state software can't change the
 *   current active lock/unlock state of all pages. nand_lock() / nand_unlock()
 *   calls will fail. It is only posible to leave lock-tight state by
 *   an hardware signal (low pulse on _WP pin) or by power down.
 */
int nand_lock(struct mtd_info *mtd, int tight)
{
	int ret = 0;
	int status;
	struct nand_chip *chip = mtd->priv;

	/* select the NAND device */
	chip->select_chip(mtd, 0);

	chip->cmdfunc(mtd,
		      (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK),
		      -1, -1);

	/* call wait ready function */
	status = chip->waitfunc(mtd, chip);

	/* see if device thinks it succeeded */
	if (status & 0x01) {
		ret = -1;
	}

	/* de-select the NAND device */
	chip->select_chip(mtd, -1);
	return ret;
}

/**
 * nand_get_lock_status: - query current lock state from one page of NAND
 *			   flash
 *
 * @param mtd		nand mtd instance
 * @param offset	page address to query (muss be page aligned!)
 *
 * @return		-1 in case of error
 *			>0 lock status:
 *			  bitfield with the following combinations:
 *			  NAND_LOCK_STATUS_TIGHT: page in tight state
 *			  NAND_LOCK_STATUS_LOCK:  page locked
 *			  NAND_LOCK_STATUS_UNLOCK: page unlocked
 *
 */
int nand_get_lock_status(struct mtd_info *mtd, loff_t offset)
{
	int ret = 0;
	int chipnr;
	int page;
	struct nand_chip *chip = mtd->priv;

	/* select the NAND device */
	chipnr = (int)(offset >> chip->chip_shift);
	chip->select_chip(mtd, chipnr);


	if ((offset & (mtd->writesize - 1)) != 0) {
		printf ("nand_get_lock_status: "
			"Start address must be beginning of "
			"nand page!\n");
		ret = -1;
		goto out;
	}

	/* check the Lock Status */
	page = (int)(offset >> chip->page_shift);
	chip->cmdfunc(mtd, NAND_CMD_LOCK_STATUS, -1, page & chip->pagemask);

	ret = chip->read_byte(mtd) & (NAND_LOCK_STATUS_TIGHT
					  | NAND_LOCK_STATUS_LOCK
					  | NAND_LOCK_STATUS_UNLOCK);

 out:
	/* de-select the NAND device */
	chip->select_chip(mtd, -1);
	return ret;
}

/**
 * nand_unlock: - Unlock area of NAND pages
 *		  only one consecutive area can be unlocked at one time!
 *
 * @param mtd		nand mtd instance
 * @param start		start byte address
 * @param length	number of bytes to unlock (must be a multiple of
 *			page size nand->writesize)
 *
 * @return		0 on success, -1 in case of error
 */
int nand_unlock(struct mtd_info *mtd, ulong start, ulong length)
{
	int ret = 0;
	int chipnr;
	int status;
	int page;
	struct nand_chip *chip = mtd->priv;
	printf ("nand_unlock: start: %08x, length: %d!\n",
		(int)start, (int)length);

	/* select the NAND device */
	chipnr = (int)(start >> chip->chip_shift);
	chip->select_chip(mtd, chipnr);

	/* check the WP bit */
	chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
	if (!(chip->read_byte(mtd) & NAND_STATUS_WP)) {
		printf ("nand_unlock: Device is write protected!\n");
		ret = -1;
		goto out;
	}

	if ((start & (mtd->erasesize - 1)) != 0) {
		printf ("nand_unlock: Start address must be beginning of "
			"nand block!\n");
		ret = -1;
		goto out;
	}

	if (length == 0 || (length & (mtd->erasesize - 1)) != 0) {
		printf ("nand_unlock: Length must be a multiple of nand block "
			"size %08x!\n", mtd->erasesize);
		ret = -1;
		goto out;
	}

	/*
	 * Set length so that the last address is set to the
	 * starting address of the last block
	 */
	length -= mtd->erasesize;

	/* submit address of first page to unlock */
	page = (int)(start >> chip->page_shift);
	chip->cmdfunc(mtd, NAND_CMD_UNLOCK1, -1, page & chip->pagemask);

	/* submit ADDRESS of LAST page to unlock */
	page += (int)(length >> chip->page_shift);
	chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, page & chip->pagemask);

	/* call wait ready function */
	status = chip->waitfunc(mtd, chip);
	/* see if device thinks it succeeded */
	if (status & 0x01) {
		/* there was an error */
		ret = -1;
		goto out;
	}

 out:
	/* de-select the NAND device */
	chip->select_chip(mtd, -1);
	return ret;
}
#endif

/**
 * get_len_incl_bad
 *
 * Check if length including bad blocks fits into device.
 *
 * @param nand NAND device
 * @param offset offset in flash
 * @param length image length
 * @return image length including bad blocks
 */
static size_t get_len_incl_bad (nand_info_t *nand, loff_t offset,
				const size_t length)
{
	size_t len_incl_bad = 0;
	size_t len_excl_bad = 0;
	size_t block_len;

	while (len_excl_bad < length) {
		block_len = nand->erasesize - (offset & (nand->erasesize - 1));

		if (!nand_block_isbad (nand, offset & ~(nand->erasesize - 1)))
			len_excl_bad += block_len;

		len_incl_bad += block_len;
		offset       += block_len;

		if (offset >= nand->size)
			break;
	}

	return len_incl_bad;
}

/**
 * nand_write_skip_bad:
 *
 * Write image to NAND flash.
 * Blocks that are marked bad are skipped and the is written to the next
 * block instead as long as the image is short enough to fit even after
 * skipping the bad blocks.
 *
 * @param nand  	NAND device
 * @param offset	offset in flash
 * @param length	buffer length
 * @param buf           buffer to read from
 * @return		0 in case of success
 */
int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
			u_char *buffer)
{
	int rval;
	size_t left_to_write = *length;
	size_t len_incl_bad;
	u_char *p_buffer = buffer;

	/* Reject writes, which are not page aligned */
	if ((offset & (nand->writesize - 1)) != 0 ||
	    (*length & (nand->writesize - 1)) != 0) {
		printf ("Attempt to write non page aligned data\n");
		return -EINVAL;
	}

	len_incl_bad = get_len_incl_bad (nand, offset, *length);

	if ((offset + len_incl_bad) > nand->size) {
		printf ("Attempt to write outside the flash area\n");
		return -EINVAL;
	}

	if (len_incl_bad == *length) {
		rval = nand_write (nand, offset, length, buffer);
		if (rval != 0)
			printf ("NAND write to offset %llx failed %d\n",
				offset, rval);

		return rval;
	}

	while (left_to_write > 0) {
		size_t block_offset = offset & (nand->erasesize - 1);
		size_t write_size;

		WATCHDOG_RESET ();

		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
			printf ("Skip bad block 0x%08llx\n",
				offset & ~(nand->erasesize - 1));
			offset += nand->erasesize - block_offset;
			continue;
		}

		if (left_to_write < (nand->erasesize - block_offset))
			write_size = left_to_write;
		else
			write_size = nand->erasesize - block_offset;

		rval = nand_write (nand, offset, &write_size, p_buffer);
		if (rval != 0) {
			printf ("NAND write to offset %llx failed %d\n",
				offset, rval);
			*length -= left_to_write;
			return rval;
		}

		left_to_write -= write_size;
		offset        += write_size;
		p_buffer      += write_size;
	}

	return 0;
}

/**
 * nand_read_skip_bad:
 *
 * Read image from NAND flash.
 * Blocks that are marked bad are skipped and the next block is readen
 * instead as long as the image is short enough to fit even after skipping the
 * bad blocks.
 *
 * @param nand NAND device
 * @param offset offset in flash
 * @param length buffer length, on return holds remaining bytes to read
 * @param buffer buffer to write to
 * @return 0 in case of success
 */
int nand_read_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
		       u_char *buffer)
{
	int rval;
	size_t left_to_read = *length;
	size_t len_incl_bad;
	u_char *p_buffer = buffer;

	len_incl_bad = get_len_incl_bad (nand, offset, *length);

	if ((offset + len_incl_bad) > nand->size) {
		printf ("Attempt to read outside the flash area\n");
		return -EINVAL;
	}

	if (len_incl_bad == *length) {
		rval = nand_read (nand, offset, length, buffer);
		if (!rval || rval == -EUCLEAN)
			return 0;
		printf ("NAND read from offset %llx failed %d\n",
			offset, rval);
		return rval;
	}

	while (left_to_read > 0) {
		size_t block_offset = offset & (nand->erasesize - 1);
		size_t read_length;

		WATCHDOG_RESET ();

		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
			printf ("Skipping bad block 0x%08llx\n",
				offset & ~(nand->erasesize - 1));
			offset += nand->erasesize - block_offset;
			continue;
		}

		if (left_to_read < (nand->erasesize - block_offset))
			read_length = left_to_read;
		else
			read_length = nand->erasesize - block_offset;

		rval = nand_read (nand, offset, &read_length, p_buffer);
		if (rval && rval != -EUCLEAN) {
			printf ("NAND read from offset %llx failed %d\n",
				offset, rval);
			*length -= left_to_read;
			return rval;
		}

		left_to_read -= read_length;
		offset       += read_length;
		p_buffer     += read_length;
	}

	return 0;
}