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 * See file CREDITS for list of people who contributed to this
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License version
19 * 2 as published by the Free Software Foundation.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
40 #include <asm/errno.h>
41 #include <linux/mtd/mtd.h>
43 #include <jffs2/jffs2.h>
45 typedef struct erase_info erase_info_t
;
46 typedef struct mtd_info mtd_info_t
;
48 /* support only for native endian JFFS2 */
49 #define cpu_to_je16(x) (x)
50 #define cpu_to_je32(x) (x)
52 /*****************************************************************************/
53 static int nand_block_bad_scrub(struct mtd_info
*mtd
, loff_t ofs
, int getchip
)
59 * nand_erase_opts: - erase NAND flash with support for various options
62 * @param meminfo NAND device to erase
63 * @param opts options, @see struct nand_erase_options
64 * @return 0 in case of success
66 * This code is ported from flash_eraseall.c from Linux mtd utils by
67 * Arcom Control System Ltd.
69 int nand_erase_opts(nand_info_t
*meminfo
, const nand_erase_options_t
*opts
)
71 struct jffs2_unknown_node cleanmarker
;
76 int percent_complete
= -1;
77 int (*nand_block_bad_old
)(struct mtd_info
*, loff_t
, int) = NULL
;
78 const char *mtd_device
= meminfo
->name
;
79 struct mtd_oob_ops oob_opts
;
80 struct nand_chip
*chip
= meminfo
->priv
;
82 memset(&erase
, 0, sizeof(erase
));
83 memset(&oob_opts
, 0, sizeof(oob_opts
));
86 erase
.len
= meminfo
->erasesize
;
87 erase
.addr
= opts
->offset
;
88 erase_length
= opts
->length
;
90 cleanmarker
.magic
= cpu_to_je16 (JFFS2_MAGIC_BITMASK
);
91 cleanmarker
.nodetype
= cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER
);
92 cleanmarker
.totlen
= cpu_to_je32(8);
94 /* scrub option allows to erase badblock. To prevent internal
95 * check from erase() method, set block check method to dummy
96 * and disable bad block table while erasing.
99 struct nand_chip
*priv_nand
= meminfo
->priv
;
101 nand_block_bad_old
= priv_nand
->block_bad
;
102 priv_nand
->block_bad
= nand_block_bad_scrub
;
103 /* we don't need the bad block table anymore...
104 * after scrub, there are no bad blocks left!
106 if (priv_nand
->bbt
) {
107 kfree(priv_nand
->bbt
);
109 priv_nand
->bbt
= NULL
;
112 if (erase_length
< meminfo
->erasesize
) {
113 printf("Warning: Erase size 0x%08lx smaller than one " \
114 "erase block 0x%08x\n",erase_length
, meminfo
->erasesize
);
115 printf(" Erasing 0x%08x instead\n", meminfo
->erasesize
);
116 erase_length
= meminfo
->erasesize
;
120 erase
.addr
< opts
->offset
+ erase_length
;
121 erase
.addr
+= meminfo
->erasesize
) {
125 if (!opts
->scrub
&& bbtest
) {
126 int ret
= meminfo
->block_isbad(meminfo
, erase
.addr
);
129 printf("\rSkipping bad block at "
135 } else if (ret
< 0) {
136 printf("\n%s: MTD get bad block failed: %d\n",
143 result
= meminfo
->erase(meminfo
, &erase
);
145 printf("\n%s: MTD Erase failure: %d\n",
150 /* format for JFFS2 ? */
151 if (opts
->jffs2
&& chip
->ecc
.layout
->oobavail
>= 8) {
152 chip
->ops
.ooblen
= 8;
153 chip
->ops
.datbuf
= NULL
;
154 chip
->ops
.oobbuf
= (uint8_t *)&cleanmarker
;
155 chip
->ops
.ooboffs
= 0;
156 chip
->ops
.mode
= MTD_OOB_AUTO
;
158 result
= meminfo
->write_oob(meminfo
,
162 printf("\n%s: MTD writeoob failure: %d\n",
169 unsigned long long n
=(unsigned long long)
170 (erase
.addr
+ meminfo
->erasesize
- opts
->offset
)
174 do_div(n
, erase_length
);
177 /* output progress message only at whole percent
178 * steps to reduce the number of messages printed
179 * on (slow) serial consoles
181 if (percent
!= percent_complete
) {
182 percent_complete
= percent
;
184 printf("\rErasing at 0x%x -- %3d%% complete.",
185 erase
.addr
, percent
);
187 if (opts
->jffs2
&& result
== 0)
188 printf(" Cleanmarker written at 0x%x.",
196 if (nand_block_bad_old
) {
197 struct nand_chip
*priv_nand
= meminfo
->priv
;
199 priv_nand
->block_bad
= nand_block_bad_old
;
200 priv_nand
->scan_bbt(meminfo
);
209 #define MAX_PAGE_SIZE 2048
210 #define MAX_OOB_SIZE 64
213 * buffer array used for writing data
215 static unsigned char data_buf
[MAX_PAGE_SIZE
];
216 static unsigned char oob_buf
[MAX_OOB_SIZE
];
218 /* OOB layouts to pass into the kernel as default */
219 static struct nand_ecclayout none_ecclayout
= {
220 .useecc
= MTD_NANDECC_OFF
,
223 static struct nand_ecclayout jffs2_ecclayout
= {
224 .useecc
= MTD_NANDECC_PLACE
,
226 .eccpos
= { 0, 1, 2, 3, 6, 7 }
229 static struct nand_ecclayout yaffs_ecclayout
= {
230 .useecc
= MTD_NANDECC_PLACE
,
232 .eccpos
= { 8, 9, 10, 13, 14, 15}
235 static struct nand_ecclayout autoplace_ecclayout
= {
236 .useecc
= MTD_NANDECC_AUTOPLACE
242 /******************************************************************************
243 * Support for locking / unlocking operations of some NAND devices
244 *****************************************************************************/
246 #define NAND_CMD_LOCK 0x2a
247 #define NAND_CMD_LOCK_TIGHT 0x2c
248 #define NAND_CMD_UNLOCK1 0x23
249 #define NAND_CMD_UNLOCK2 0x24
250 #define NAND_CMD_LOCK_STATUS 0x7a
253 * nand_lock: Set all pages of NAND flash chip to the LOCK or LOCK-TIGHT
256 * @param meminfo nand mtd instance
257 * @param tight bring device in lock tight mode
259 * @return 0 on success, -1 in case of error
261 * The lock / lock-tight command only applies to the whole chip. To get some
262 * parts of the chip lock and others unlocked use the following sequence:
264 * - Lock all pages of the chip using nand_lock(mtd, 0) (or the lockpre pin)
265 * - Call nand_unlock() once for each consecutive area to be unlocked
266 * - If desired: Bring the chip to the lock-tight state using nand_lock(mtd, 1)
268 * If the device is in lock-tight state software can't change the
269 * current active lock/unlock state of all pages. nand_lock() / nand_unlock()
270 * calls will fail. It is only posible to leave lock-tight state by
271 * an hardware signal (low pulse on _WP pin) or by power down.
273 int nand_lock(nand_info_t
*meminfo
, int tight
)
277 struct nand_chip
*this = meminfo
->priv
;
279 /* select the NAND device */
280 this->select_chip(meminfo
, 0);
282 this->cmdfunc(meminfo
,
283 (tight
? NAND_CMD_LOCK_TIGHT
: NAND_CMD_LOCK
),
286 /* call wait ready function */
287 status
= this->waitfunc(meminfo
, this, FL_WRITING
);
289 /* see if device thinks it succeeded */
294 /* de-select the NAND device */
295 this->select_chip(meminfo
, -1);
300 * nand_get_lock_status: - query current lock state from one page of NAND
303 * @param meminfo nand mtd instance
304 * @param offset page address to query (muss be page aligned!)
306 * @return -1 in case of error
308 * bitfield with the following combinations:
309 * NAND_LOCK_STATUS_TIGHT: page in tight state
310 * NAND_LOCK_STATUS_LOCK: page locked
311 * NAND_LOCK_STATUS_UNLOCK: page unlocked
314 int nand_get_lock_status(nand_info_t
*meminfo
, ulong offset
)
319 struct nand_chip
*this = meminfo
->priv
;
321 /* select the NAND device */
322 chipnr
= (int)(offset
>> this->chip_shift
);
323 this->select_chip(meminfo
, chipnr
);
326 if ((offset
& (meminfo
->writesize
- 1)) != 0) {
327 printf ("nand_get_lock_status: "
328 "Start address must be beginning of "
334 /* check the Lock Status */
335 page
= (int)(offset
>> this->page_shift
);
336 this->cmdfunc(meminfo
, NAND_CMD_LOCK_STATUS
, -1, page
& this->pagemask
);
338 ret
= this->read_byte(meminfo
) & (NAND_LOCK_STATUS_TIGHT
339 | NAND_LOCK_STATUS_LOCK
340 | NAND_LOCK_STATUS_UNLOCK
);
343 /* de-select the NAND device */
344 this->select_chip(meminfo
, -1);
349 * nand_unlock: - Unlock area of NAND pages
350 * only one consecutive area can be unlocked at one time!
352 * @param meminfo nand mtd instance
353 * @param start start byte address
354 * @param length number of bytes to unlock (must be a multiple of
355 * page size nand->writesize)
357 * @return 0 on success, -1 in case of error
359 int nand_unlock(nand_info_t
*meminfo
, ulong start
, ulong length
)
365 struct nand_chip
*this = meminfo
->priv
;
366 printf ("nand_unlock: start: %08x, length: %d!\n",
367 (int)start
, (int)length
);
369 /* select the NAND device */
370 chipnr
= (int)(start
>> this->chip_shift
);
371 this->select_chip(meminfo
, chipnr
);
373 /* check the WP bit */
374 this->cmdfunc(meminfo
, NAND_CMD_STATUS
, -1, -1);
375 if ((this->read_byte(meminfo
) & 0x80) == 0) {
376 printf ("nand_unlock: Device is write protected!\n");
381 if ((start
& (meminfo
->writesize
- 1)) != 0) {
382 printf ("nand_unlock: Start address must be beginning of "
388 if (length
== 0 || (length
& (meminfo
->writesize
- 1)) != 0) {
389 printf ("nand_unlock: Length must be a multiple of nand page "
395 /* submit address of first page to unlock */
396 page
= (int)(start
>> this->page_shift
);
397 this->cmdfunc(meminfo
, NAND_CMD_UNLOCK1
, -1, page
& this->pagemask
);
399 /* submit ADDRESS of LAST page to unlock */
400 page
+= (int)(length
>> this->page_shift
) - 1;
401 this->cmdfunc(meminfo
, NAND_CMD_UNLOCK2
, -1, page
& this->pagemask
);
403 /* call wait ready function */
404 status
= this->waitfunc(meminfo
, this, FL_WRITING
);
405 /* see if device thinks it succeeded */
407 /* there was an error */
413 /* de-select the NAND device */
414 this->select_chip(meminfo
, -1);
422 * Check if length including bad blocks fits into device.
424 * @param nand NAND device
425 * @param offset offset in flash
426 * @param length image length
427 * @return image length including bad blocks
429 static size_t get_len_incl_bad (nand_info_t
*nand
, size_t offset
,
432 size_t len_incl_bad
= 0;
433 size_t len_excl_bad
= 0;
436 while (len_excl_bad
< length
) {
437 block_len
= nand
->erasesize
- (offset
& (nand
->erasesize
- 1));
439 if (!nand_block_isbad (nand
, offset
& ~(nand
->erasesize
- 1)))
440 len_excl_bad
+= block_len
;
442 len_incl_bad
+= block_len
;
445 if ((offset
+ len_incl_bad
) >= nand
->size
)
453 * nand_write_skip_bad:
455 * Write image to NAND flash.
456 * Blocks that are marked bad are skipped and the is written to the next
457 * block instead as long as the image is short enough to fit even after
458 * skipping the bad blocks.
460 * @param nand NAND device
461 * @param offset offset in flash
462 * @param length buffer length
463 * @param buf buffer to read from
464 * @return 0 in case of success
466 int nand_write_skip_bad(nand_info_t
*nand
, size_t offset
, size_t *length
,
470 size_t left_to_write
= *length
;
472 u_char
*p_buffer
= buffer
;
474 /* Reject writes, which are not page aligned */
475 if ((offset
& (nand
->writesize
- 1)) != 0 ||
476 (*length
& (nand
->writesize
- 1)) != 0) {
477 printf ("Attempt to write non page aligned data\n");
481 len_incl_bad
= get_len_incl_bad (nand
, offset
, *length
);
483 if ((offset
+ len_incl_bad
) >= nand
->size
) {
484 printf ("Attempt to write outside the flash area\n");
488 if (len_incl_bad
== *length
) {
489 rval
= nand_write (nand
, offset
, length
, buffer
);
491 printf ("NAND write to offset %x failed %d\n",
497 while (left_to_write
> 0) {
498 size_t block_offset
= offset
& (nand
->erasesize
- 1);
501 if (nand_block_isbad (nand
, offset
& ~(nand
->erasesize
- 1))) {
502 printf ("Skip bad block 0x%08x\n",
503 offset
& ~(nand
->erasesize
- 1));
504 offset
+= nand
->erasesize
- block_offset
;
508 if (left_to_write
< (nand
->erasesize
- block_offset
))
509 write_size
= left_to_write
;
511 write_size
= nand
->erasesize
- block_offset
;
513 rval
= nand_write (nand
, offset
, &write_size
, p_buffer
);
515 printf ("NAND write to offset %x failed %d\n",
517 *length
-= left_to_write
;
521 left_to_write
-= write_size
;
522 offset
+= write_size
;
523 p_buffer
+= write_size
;
530 * nand_read_skip_bad:
532 * Read image from NAND flash.
533 * Blocks that are marked bad are skipped and the next block is readen
534 * instead as long as the image is short enough to fit even after skipping the
537 * @param nand NAND device
538 * @param offset offset in flash
539 * @param length buffer length, on return holds remaining bytes to read
540 * @param buffer buffer to write to
541 * @return 0 in case of success
543 int nand_read_skip_bad(nand_info_t
*nand
, size_t offset
, size_t *length
,
547 size_t left_to_read
= *length
;
549 u_char
*p_buffer
= buffer
;
551 len_incl_bad
= get_len_incl_bad (nand
, offset
, *length
);
553 if ((offset
+ len_incl_bad
) >= nand
->size
) {
554 printf ("Attempt to read outside the flash area\n");
558 if (len_incl_bad
== *length
) {
559 rval
= nand_read (nand
, offset
, length
, buffer
);
561 printf ("NAND read from offset %x failed %d\n",
567 while (left_to_read
> 0) {
568 size_t block_offset
= offset
& (nand
->erasesize
- 1);
571 if (nand_block_isbad (nand
, offset
& ~(nand
->erasesize
- 1))) {
572 printf ("Skipping bad block 0x%08x\n",
573 offset
& ~(nand
->erasesize
- 1));
574 offset
+= nand
->erasesize
- block_offset
;
578 if (left_to_read
< (nand
->erasesize
- block_offset
))
579 read_length
= left_to_read
;
581 read_length
= nand
->erasesize
- block_offset
;
583 rval
= nand_read (nand
, offset
, &read_length
, p_buffer
);
585 printf ("NAND read from offset %x failed %d\n",
587 *length
-= left_to_read
;
591 left_to_read
-= read_length
;
592 offset
+= read_length
;
593 p_buffer
+= read_length
;