2 * drivers/mtd/nand/nand_util.c
4 * Copyright (C) 2006 by Weiss-Electronic GmbH.
7 * @author: Guido Classen <clagix@gmail.com>
8 * @descr: NAND Flash support
9 * @references: borrowed heavily from Linux mtd-utils code:
10 * flash_eraseall.c by Arcom Control System Ltd
11 * nandwrite.c by Steven J. Hill (sjhill@realitydiluted.com)
12 * and Thomas Gleixner (tglx@linutronix.de)
14 * Copyright (C) 2008 Nokia Corporation: drop_ffs() function by
15 * Artem Bityutskiy <dedekind1@gmail.com> from mtd-utils
17 * See file CREDITS for list of people who contributed to this
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License version
22 * 2 as published by the Free Software Foundation.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License
30 * along with this program; if not, write to the Free Software
31 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
34 * Copyright 2010 Freescale Semiconductor
35 * The portions of this file whose copyright is held by Freescale and which
36 * are not considered a derived work of GPL v2-only code may be distributed
37 * and/or modified under the terms of the GNU General Public License as
38 * published by the Free Software Foundation; either version 2 of the
39 * License, or (at your option) any later version.
48 #include <asm/errno.h>
49 #include <linux/mtd/mtd.h>
51 #include <jffs2/jffs2.h>
53 typedef struct erase_info erase_info_t;
54 typedef struct mtd_info mtd_info_t;
56 /* support only for native endian JFFS2 */
57 #define cpu_to_je16(x) (x)
58 #define cpu_to_je32(x) (x)
61 * nand_erase_opts: - erase NAND flash with support for various options
64 * @param meminfo NAND device to erase
65 * @param opts options, @see struct nand_erase_options
66 * @return 0 in case of success
68 * This code is ported from flash_eraseall.c from Linux mtd utils by
69 * Arcom Control System Ltd.
71 int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
73 struct jffs2_unknown_node cleanmarker;
75 unsigned long erase_length, erased_length; /* in blocks */
78 int percent_complete = -1;
79 const char *mtd_device = meminfo->name;
80 struct mtd_oob_ops oob_opts;
81 struct nand_chip *chip = meminfo->priv;
83 if ((opts->offset & (meminfo->writesize - 1)) != 0) {
84 printf("Attempt to erase non page aligned data\n");
88 memset(&erase, 0, sizeof(erase));
89 memset(&oob_opts, 0, sizeof(oob_opts));
92 erase.len = meminfo->erasesize;
93 erase.addr = opts->offset;
94 erase_length = lldiv(opts->length + meminfo->erasesize - 1,
97 cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
98 cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
99 cleanmarker.totlen = cpu_to_je32(8);
101 /* scrub option allows to erase badblock. To prevent internal
102 * check from erase() method, set block check method to dummy
103 * and disable bad block table while erasing.
106 erase.scrub = opts->scrub;
108 * We don't need the bad block table anymore...
109 * after scrub, there are no bad blocks left!
117 for (erased_length = 0;
118 erased_length < erase_length;
119 erase.addr += meminfo->erasesize) {
123 if (!opts->scrub && bbtest) {
124 int ret = meminfo->block_isbad(meminfo, erase.addr);
127 printf("\rSkipping bad block at "
137 } else if (ret < 0) {
138 printf("\n%s: MTD get bad block failed: %d\n",
147 result = meminfo->erase(meminfo, &erase);
149 printf("\n%s: MTD Erase failure: %d\n",
154 /* format for JFFS2 ? */
155 if (opts->jffs2 && chip->ecc.layout->oobavail >= 8) {
156 chip->ops.ooblen = 8;
157 chip->ops.datbuf = NULL;
158 chip->ops.oobbuf = (uint8_t *)&cleanmarker;
159 chip->ops.ooboffs = 0;
160 chip->ops.mode = MTD_OOB_AUTO;
162 result = meminfo->write_oob(meminfo,
166 printf("\n%s: MTD writeoob failure: %d\n",
173 unsigned long long n = erased_length * 100ULL;
176 do_div(n, erase_length);
179 /* output progress message only at whole percent
180 * steps to reduce the number of messages printed
181 * on (slow) serial consoles
183 if (percent != percent_complete) {
184 percent_complete = percent;
186 printf("\rErasing at 0x%llx -- %3d%% complete.",
187 erase.addr, percent);
189 if (opts->jffs2 && result == 0)
190 printf(" Cleanmarker written at 0x%llx.",
199 chip->scan_bbt(meminfo);
204 #ifdef CONFIG_CMD_NAND_LOCK_UNLOCK
206 /******************************************************************************
207 * Support for locking / unlocking operations of some NAND devices
208 *****************************************************************************/
211 * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
214 * @param mtd nand mtd instance
215 * @param tight bring device in lock tight mode
217 * @return 0 on success, -1 in case of error
219 * The lock / lock-tight command only applies to the whole chip. To get some
220 * parts of the chip lock and others unlocked use the following sequence:
222 * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
223 * - Call nand_unlock() once for each consecutive area to be unlocked
224 * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
226 * If the device is in lock-tight state software can't change the
227 * current active lock/unlock state of all pages. nand_lock() / nand_unlock()
228 * calls will fail. It is only posible to leave lock-tight state by
229 * an hardware signal (low pulse on _WP pin) or by power down.
231 int nand_lock(struct mtd_info *mtd, int tight)
235 struct nand_chip *chip = mtd->priv;
237 /* select the NAND device */
238 chip->select_chip(mtd, 0);
241 (tight ? NAND_CMD_LOCK_TIGHT : NAND_CMD_LOCK),
244 /* call wait ready function */
245 status = chip->waitfunc(mtd, chip);
247 /* see if device thinks it succeeded */
252 /* de-select the NAND device */
253 chip->select_chip(mtd, -1);
258 * nand_get_lock_status: - query current lock state from one page of NAND
261 * @param mtd nand mtd instance
262 * @param offset page address to query (muss be page aligned!)
264 * @return -1 in case of error
266 * bitfield with the following combinations:
267 * NAND_LOCK_STATUS_TIGHT: page in tight state
268 * NAND_LOCK_STATUS_LOCK: page locked
269 * NAND_LOCK_STATUS_UNLOCK: page unlocked
272 int nand_get_lock_status(struct mtd_info *mtd, loff_t offset)
277 struct nand_chip *chip = mtd->priv;
279 /* select the NAND device */
280 chipnr = (int)(offset >> chip->chip_shift);
281 chip->select_chip(mtd, chipnr);
284 if ((offset & (mtd->writesize - 1)) != 0) {
285 printf ("nand_get_lock_status: "
286 "Start address must be beginning of "
292 /* check the Lock Status */
293 page = (int)(offset >> chip->page_shift);
294 chip->cmdfunc(mtd, NAND_CMD_LOCK_STATUS, -1, page & chip->pagemask);
296 ret = chip->read_byte(mtd) & (NAND_LOCK_STATUS_TIGHT
297 | NAND_LOCK_STATUS_LOCK
298 | NAND_LOCK_STATUS_UNLOCK);
301 /* de-select the NAND device */
302 chip->select_chip(mtd, -1);
307 * nand_unlock: - Unlock area of NAND pages
308 * only one consecutive area can be unlocked at one time!
310 * @param mtd nand mtd instance
311 * @param start start byte address
312 * @param length number of bytes to unlock (must be a multiple of
313 * page size nand->writesize)
314 * @param allexcept if set, unlock everything not selected
316 * @return 0 on success, -1 in case of error
318 int nand_unlock(struct mtd_info *mtd, loff_t start, size_t length,
325 struct nand_chip *chip = mtd->priv;
327 debug("nand_unlock%s: start: %08llx, length: %d!\n",
328 allexcept ? " (allexcept)" : "", start, length);
330 /* select the NAND device */
331 chipnr = (int)(start >> chip->chip_shift);
332 chip->select_chip(mtd, chipnr);
334 /* check the WP bit */
335 chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
336 if (!(chip->read_byte(mtd) & NAND_STATUS_WP)) {
337 printf ("nand_unlock: Device is write protected!\n");
342 if ((start & (mtd->erasesize - 1)) != 0) {
343 printf ("nand_unlock: Start address must be beginning of "
349 if (length == 0 || (length & (mtd->erasesize - 1)) != 0) {
350 printf ("nand_unlock: Length must be a multiple of nand block "
351 "size %08x!\n", mtd->erasesize);
357 * Set length so that the last address is set to the
358 * starting address of the last block
360 length -= mtd->erasesize;
362 /* submit address of first page to unlock */
363 page = (int)(start >> chip->page_shift);
364 chip->cmdfunc(mtd, NAND_CMD_UNLOCK1, -1, page & chip->pagemask);
366 /* submit ADDRESS of LAST page to unlock */
367 page += (int)(length >> chip->page_shift);
370 * Page addresses for unlocking are supposed to be block-aligned.
371 * At least some NAND chips use the low bit to indicate that the
372 * page range should be inverted.
377 chip->cmdfunc(mtd, NAND_CMD_UNLOCK2, -1, page & chip->pagemask);
379 /* call wait ready function */
380 status = chip->waitfunc(mtd, chip);
381 /* see if device thinks it succeeded */
383 /* there was an error */
389 /* de-select the NAND device */
390 chip->select_chip(mtd, -1);
398 * Check if there are any bad blocks, and whether length including bad
399 * blocks fits into device
401 * @param nand NAND device
402 * @param offset offset in flash
403 * @param length image length
404 * @return 0 if the image fits and there are no bad blocks
405 * 1 if the image fits, but there are bad blocks
406 * -1 if the image does not fit
408 static int check_skip_len(nand_info_t *nand, loff_t offset, size_t length)
410 size_t len_excl_bad = 0;
413 while (len_excl_bad < length) {
414 size_t block_len, block_off;
417 if (offset >= nand->size)
420 block_start = offset & ~(loff_t)(nand->erasesize - 1);
421 block_off = offset & (nand->erasesize - 1);
422 block_len = nand->erasesize - block_off;
424 if (!nand_block_isbad(nand, block_start))
425 len_excl_bad += block_len;
435 #ifdef CONFIG_CMD_NAND_TRIMFFS
436 static size_t drop_ffs(const nand_info_t *nand, const u_char *buf,
441 for (i = l - 1; i >= 0; i--)
445 /* The resulting length must be aligned to the minimum flash I/O size */
447 l = (l + nand->writesize - 1) / nand->writesize;
448 l *= nand->writesize;
451 * since the input length may be unaligned, prevent access past the end
459 * nand_write_skip_bad:
461 * Write image to NAND flash.
462 * Blocks that are marked bad are skipped and the is written to the next
463 * block instead as long as the image is short enough to fit even after
464 * skipping the bad blocks.
466 * @param nand NAND device
467 * @param offset offset in flash
468 * @param length buffer length
469 * @param buffer buffer to read from
470 * @param flags flags modifying the behaviour of the write to NAND
471 * @return 0 in case of success
473 int nand_write_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
474 u_char *buffer, int flags)
476 int rval = 0, blocksize;
477 size_t left_to_write = *length;
478 u_char *p_buffer = buffer;
481 #ifdef CONFIG_CMD_NAND_YAFFS
482 if (flags & WITH_YAFFS_OOB) {
483 if (flags & ~WITH_YAFFS_OOB)
487 pages = nand->erasesize / nand->writesize;
488 blocksize = (pages * nand->oobsize) + nand->erasesize;
489 if (*length % (nand->writesize + nand->oobsize)) {
490 printf ("Attempt to write incomplete page"
497 blocksize = nand->erasesize;
501 * nand_write() handles unaligned, partial page writes.
503 * We allow length to be unaligned, for convenience in
504 * using the $filesize variable.
506 * However, starting at an unaligned offset makes the
507 * semantics of bad block skipping ambiguous (really,
508 * you should only start a block skipping access at a
509 * partition boundary). So don't try to handle that.
511 if ((offset & (nand->writesize - 1)) != 0) {
512 printf ("Attempt to write non page aligned data\n");
517 need_skip = check_skip_len(nand, offset, *length);
519 printf ("Attempt to write outside the flash area\n");
524 if (!need_skip && !(flags & WITH_DROP_FFS)) {
525 rval = nand_write (nand, offset, length, buffer);
530 printf ("NAND write to offset %llx failed %d\n",
535 while (left_to_write > 0) {
536 size_t block_offset = offset & (nand->erasesize - 1);
537 size_t write_size, truncated_write_size;
541 if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
542 printf ("Skip bad block 0x%08llx\n",
543 offset & ~(nand->erasesize - 1));
544 offset += nand->erasesize - block_offset;
548 if (left_to_write < (blocksize - block_offset))
549 write_size = left_to_write;
551 write_size = blocksize - block_offset;
553 #ifdef CONFIG_CMD_NAND_YAFFS
554 if (flags & WITH_YAFFS_OOB) {
556 size_t pagesize = nand->writesize;
557 size_t pagesize_oob = pagesize + nand->oobsize;
558 struct mtd_oob_ops ops;
561 ops.ooblen = nand->oobsize;
562 ops.mode = MTD_OOB_AUTO;
565 pages = write_size / pagesize_oob;
566 for (page = 0; page < pages; page++) {
569 ops.datbuf = p_buffer;
570 ops.oobbuf = ops.datbuf + pagesize;
572 rval = nand->write_oob(nand, offset, &ops);
577 p_buffer += pagesize_oob;
583 truncated_write_size = write_size;
584 #ifdef CONFIG_CMD_NAND_TRIMFFS
585 if (flags & WITH_DROP_FFS)
586 truncated_write_size = drop_ffs(nand, p_buffer,
590 rval = nand_write(nand, offset, &truncated_write_size,
592 offset += write_size;
593 p_buffer += write_size;
597 printf ("NAND write to offset %llx failed %d\n",
599 *length -= left_to_write;
603 left_to_write -= write_size;
610 * nand_read_skip_bad:
612 * Read image from NAND flash.
613 * Blocks that are marked bad are skipped and the next block is readen
614 * instead as long as the image is short enough to fit even after skipping the
617 * @param nand NAND device
618 * @param offset offset in flash
619 * @param length buffer length, on return holds remaining bytes to read
620 * @param buffer buffer to write to
621 * @return 0 in case of success
623 int nand_read_skip_bad(nand_info_t *nand, loff_t offset, size_t *length,
627 size_t left_to_read = *length;
628 u_char *p_buffer = buffer;
631 if ((offset & (nand->writesize - 1)) != 0) {
632 printf ("Attempt to read non page aligned data\n");
637 need_skip = check_skip_len(nand, offset, *length);
639 printf ("Attempt to read outside the flash area\n");
645 rval = nand_read (nand, offset, length, buffer);
646 if (!rval || rval == -EUCLEAN)
650 printf ("NAND read from offset %llx failed %d\n",
655 while (left_to_read > 0) {
656 size_t block_offset = offset & (nand->erasesize - 1);
661 if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
662 printf ("Skipping bad block 0x%08llx\n",
663 offset & ~(nand->erasesize - 1));
664 offset += nand->erasesize - block_offset;
668 if (left_to_read < (nand->erasesize - block_offset))
669 read_length = left_to_read;
671 read_length = nand->erasesize - block_offset;
673 rval = nand_read (nand, offset, &read_length, p_buffer);
674 if (rval && rval != -EUCLEAN) {
675 printf ("NAND read from offset %llx failed %d\n",
677 *length -= left_to_read;
681 left_to_read -= read_length;
682 offset += read_length;
683 p_buffer += read_length;