2 * Copyright (C) 2006-2008 Nokia Corporation
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; see the file COPYING. If not, write to the Free Software
15 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 * Test page read and write on MTD device.
19 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <asm/div64.h>
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/err.h>
29 #include <linux/mtd/mtd.h>
30 #include <linux/slab.h>
31 #include <linux/sched.h>
32 #include <linux/random.h>
34 static int dev
= -EINVAL
;
35 module_param(dev
, int, S_IRUGO
);
36 MODULE_PARM_DESC(dev
, "MTD device number to use");
38 static struct mtd_info
*mtd
;
39 static unsigned char *twopages
;
40 static unsigned char *writebuf
;
41 static unsigned char *boundary
;
42 static unsigned char *bbt
;
49 static struct rnd_state rnd_state
;
51 static int erase_eraseblock(int ebnum
)
55 loff_t addr
= ebnum
* mtd
->erasesize
;
57 memset(&ei
, 0, sizeof(struct erase_info
));
60 ei
.len
= mtd
->erasesize
;
62 err
= mtd_erase(mtd
, &ei
);
64 pr_err("error %d while erasing EB %d\n", err
, ebnum
);
68 if (ei
.state
== MTD_ERASE_FAILED
) {
69 pr_err("some erase error occurred at EB %d\n",
77 static int write_eraseblock(int ebnum
)
81 loff_t addr
= ebnum
* mtd
->erasesize
;
83 prandom_bytes_state(&rnd_state
, writebuf
, mtd
->erasesize
);
85 err
= mtd_write(mtd
, addr
, mtd
->erasesize
, &written
, writebuf
);
86 if (err
|| written
!= mtd
->erasesize
)
87 pr_err("error: write failed at %#llx\n",
93 static int verify_eraseblock(int ebnum
)
99 loff_t addr
= ebnum
* mtd
->erasesize
;
102 for (i
= 0; i
< ebcnt
&& bbt
[i
]; ++i
)
103 addr0
+= mtd
->erasesize
;
106 for (i
= 0; i
< ebcnt
&& bbt
[ebcnt
- i
- 1]; ++i
)
107 addrn
-= mtd
->erasesize
;
109 prandom_bytes_state(&rnd_state
, writebuf
, mtd
->erasesize
);
110 for (j
= 0; j
< pgcnt
- 1; ++j
, addr
+= pgsize
) {
111 /* Do a read to set the internal dataRAMs to different data */
112 err
= mtd_read(mtd
, addr0
, bufsize
, &read
, twopages
);
113 if (mtd_is_bitflip(err
))
115 if (err
|| read
!= bufsize
) {
116 pr_err("error: read failed at %#llx\n",
120 err
= mtd_read(mtd
, addrn
- bufsize
, bufsize
, &read
, twopages
);
121 if (mtd_is_bitflip(err
))
123 if (err
|| read
!= bufsize
) {
124 pr_err("error: read failed at %#llx\n",
125 (long long)(addrn
- bufsize
));
128 memset(twopages
, 0, bufsize
);
129 err
= mtd_read(mtd
, addr
, bufsize
, &read
, twopages
);
130 if (mtd_is_bitflip(err
))
132 if (err
|| read
!= bufsize
) {
133 pr_err("error: read failed at %#llx\n",
137 if (memcmp(twopages
, writebuf
+ (j
* pgsize
), bufsize
)) {
138 pr_err("error: verify failed at %#llx\n",
143 /* Check boundary between eraseblocks */
144 if (addr
<= addrn
- pgsize
- pgsize
&& !bbt
[ebnum
+ 1]) {
145 struct rnd_state old_state
= rnd_state
;
147 /* Do a read to set the internal dataRAMs to different data */
148 err
= mtd_read(mtd
, addr0
, bufsize
, &read
, twopages
);
149 if (mtd_is_bitflip(err
))
151 if (err
|| read
!= bufsize
) {
152 pr_err("error: read failed at %#llx\n",
156 err
= mtd_read(mtd
, addrn
- bufsize
, bufsize
, &read
, twopages
);
157 if (mtd_is_bitflip(err
))
159 if (err
|| read
!= bufsize
) {
160 pr_err("error: read failed at %#llx\n",
161 (long long)(addrn
- bufsize
));
164 memset(twopages
, 0, bufsize
);
165 err
= mtd_read(mtd
, addr
, bufsize
, &read
, twopages
);
166 if (mtd_is_bitflip(err
))
168 if (err
|| read
!= bufsize
) {
169 pr_err("error: read failed at %#llx\n",
173 memcpy(boundary
, writebuf
+ mtd
->erasesize
- pgsize
, pgsize
);
174 prandom_bytes_state(&rnd_state
, boundary
+ pgsize
, pgsize
);
175 if (memcmp(twopages
, boundary
, bufsize
)) {
176 pr_err("error: verify failed at %#llx\n",
180 rnd_state
= old_state
;
185 static int crosstest(void)
189 loff_t addr
, addr0
, addrn
;
190 unsigned char *pp1
, *pp2
, *pp3
, *pp4
;
192 pr_info("crosstest\n");
193 pp1
= kmalloc(pgsize
* 4, GFP_KERNEL
);
195 pr_err("error: cannot allocate memory\n");
201 memset(pp1
, 0, pgsize
* 4);
204 for (i
= 0; i
< ebcnt
&& bbt
[i
]; ++i
)
205 addr0
+= mtd
->erasesize
;
208 for (i
= 0; i
< ebcnt
&& bbt
[ebcnt
- i
- 1]; ++i
)
209 addrn
-= mtd
->erasesize
;
211 /* Read 2nd-to-last page to pp1 */
212 addr
= addrn
- pgsize
- pgsize
;
213 err
= mtd_read(mtd
, addr
, pgsize
, &read
, pp1
);
214 if (mtd_is_bitflip(err
))
216 if (err
|| read
!= pgsize
) {
217 pr_err("error: read failed at %#llx\n",
223 /* Read 3rd-to-last page to pp1 */
224 addr
= addrn
- pgsize
- pgsize
- pgsize
;
225 err
= mtd_read(mtd
, addr
, pgsize
, &read
, pp1
);
226 if (mtd_is_bitflip(err
))
228 if (err
|| read
!= pgsize
) {
229 pr_err("error: read failed at %#llx\n",
235 /* Read first page to pp2 */
237 pr_info("reading page at %#llx\n", (long long)addr
);
238 err
= mtd_read(mtd
, addr
, pgsize
, &read
, pp2
);
239 if (mtd_is_bitflip(err
))
241 if (err
|| read
!= pgsize
) {
242 pr_err("error: read failed at %#llx\n",
248 /* Read last page to pp3 */
249 addr
= addrn
- pgsize
;
250 pr_info("reading page at %#llx\n", (long long)addr
);
251 err
= mtd_read(mtd
, addr
, pgsize
, &read
, pp3
);
252 if (mtd_is_bitflip(err
))
254 if (err
|| read
!= pgsize
) {
255 pr_err("error: read failed at %#llx\n",
261 /* Read first page again to pp4 */
263 pr_info("reading page at %#llx\n", (long long)addr
);
264 err
= mtd_read(mtd
, addr
, pgsize
, &read
, pp4
);
265 if (mtd_is_bitflip(err
))
267 if (err
|| read
!= pgsize
) {
268 pr_err("error: read failed at %#llx\n",
274 /* pp2 and pp4 should be the same */
275 pr_info("verifying pages read at %#llx match\n",
277 if (memcmp(pp2
, pp4
, pgsize
)) {
278 pr_err("verify failed!\n");
281 pr_info("crosstest ok\n");
286 static int erasecrosstest(void)
288 size_t read
, written
;
289 int err
= 0, i
, ebnum
, ebnum2
;
291 char *readbuf
= twopages
;
293 pr_info("erasecrosstest\n");
297 for (i
= 0; i
< ebcnt
&& bbt
[i
]; ++i
) {
298 addr0
+= mtd
->erasesize
;
303 while (ebnum2
&& bbt
[ebnum2
])
306 pr_info("erasing block %d\n", ebnum
);
307 err
= erase_eraseblock(ebnum
);
311 pr_info("writing 1st page of block %d\n", ebnum
);
312 prandom_bytes_state(&rnd_state
, writebuf
, pgsize
);
313 strcpy(writebuf
, "There is no data like this!");
314 err
= mtd_write(mtd
, addr0
, pgsize
, &written
, writebuf
);
315 if (err
|| written
!= pgsize
) {
316 pr_info("error: write failed at %#llx\n",
318 return err
? err
: -1;
321 pr_info("reading 1st page of block %d\n", ebnum
);
322 memset(readbuf
, 0, pgsize
);
323 err
= mtd_read(mtd
, addr0
, pgsize
, &read
, readbuf
);
324 if (mtd_is_bitflip(err
))
326 if (err
|| read
!= pgsize
) {
327 pr_err("error: read failed at %#llx\n",
329 return err
? err
: -1;
332 pr_info("verifying 1st page of block %d\n", ebnum
);
333 if (memcmp(writebuf
, readbuf
, pgsize
)) {
334 pr_err("verify failed!\n");
339 pr_info("erasing block %d\n", ebnum
);
340 err
= erase_eraseblock(ebnum
);
344 pr_info("writing 1st page of block %d\n", ebnum
);
345 prandom_bytes_state(&rnd_state
, writebuf
, pgsize
);
346 strcpy(writebuf
, "There is no data like this!");
347 err
= mtd_write(mtd
, addr0
, pgsize
, &written
, writebuf
);
348 if (err
|| written
!= pgsize
) {
349 pr_err("error: write failed at %#llx\n",
351 return err
? err
: -1;
354 pr_info("erasing block %d\n", ebnum2
);
355 err
= erase_eraseblock(ebnum2
);
359 pr_info("reading 1st page of block %d\n", ebnum
);
360 memset(readbuf
, 0, pgsize
);
361 err
= mtd_read(mtd
, addr0
, pgsize
, &read
, readbuf
);
362 if (mtd_is_bitflip(err
))
364 if (err
|| read
!= pgsize
) {
365 pr_err("error: read failed at %#llx\n",
367 return err
? err
: -1;
370 pr_info("verifying 1st page of block %d\n", ebnum
);
371 if (memcmp(writebuf
, readbuf
, pgsize
)) {
372 pr_err("verify failed!\n");
378 pr_info("erasecrosstest ok\n");
382 static int erasetest(void)
384 size_t read
, written
;
385 int err
= 0, i
, ebnum
, ok
= 1;
388 pr_info("erasetest\n");
392 for (i
= 0; i
< ebcnt
&& bbt
[i
]; ++i
) {
393 addr0
+= mtd
->erasesize
;
397 pr_info("erasing block %d\n", ebnum
);
398 err
= erase_eraseblock(ebnum
);
402 pr_info("writing 1st page of block %d\n", ebnum
);
403 prandom_bytes_state(&rnd_state
, writebuf
, pgsize
);
404 err
= mtd_write(mtd
, addr0
, pgsize
, &written
, writebuf
);
405 if (err
|| written
!= pgsize
) {
406 pr_err("error: write failed at %#llx\n",
408 return err
? err
: -1;
411 pr_info("erasing block %d\n", ebnum
);
412 err
= erase_eraseblock(ebnum
);
416 pr_info("reading 1st page of block %d\n", ebnum
);
417 err
= mtd_read(mtd
, addr0
, pgsize
, &read
, twopages
);
418 if (mtd_is_bitflip(err
))
420 if (err
|| read
!= pgsize
) {
421 pr_err("error: read failed at %#llx\n",
423 return err
? err
: -1;
426 pr_info("verifying 1st page of block %d is all 0xff\n",
428 for (i
= 0; i
< pgsize
; ++i
)
429 if (twopages
[i
] != 0xff) {
430 pr_err("verifying all 0xff failed at %d\n",
438 pr_info("erasetest ok\n");
443 static int is_block_bad(int ebnum
)
445 loff_t addr
= ebnum
* mtd
->erasesize
;
448 ret
= mtd_block_isbad(mtd
, addr
);
450 pr_info("block %d is bad\n", ebnum
);
454 static int scan_for_bad_eraseblocks(void)
458 bbt
= kzalloc(ebcnt
, GFP_KERNEL
);
460 pr_err("error: cannot allocate memory\n");
464 pr_info("scanning for bad eraseblocks\n");
465 for (i
= 0; i
< ebcnt
; ++i
) {
466 bbt
[i
] = is_block_bad(i
) ? 1 : 0;
471 pr_info("scanned %d eraseblocks, %d are bad\n", i
, bad
);
475 static int __init
mtd_pagetest_init(void)
481 printk(KERN_INFO
"\n");
482 printk(KERN_INFO
"=================================================\n");
485 pr_info("Please specify a valid mtd-device via module parameter\n");
486 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
490 pr_info("MTD device: %d\n", dev
);
492 mtd
= get_mtd_device(NULL
, dev
);
495 pr_err("error: cannot get MTD device\n");
499 if (mtd
->type
!= MTD_NANDFLASH
) {
500 pr_info("this test requires NAND flash\n");
505 do_div(tmp
, mtd
->erasesize
);
507 pgcnt
= mtd
->erasesize
/ mtd
->writesize
;
508 pgsize
= mtd
->writesize
;
510 pr_info("MTD device size %llu, eraseblock size %u, "
511 "page size %u, count of eraseblocks %u, pages per "
512 "eraseblock %u, OOB size %u\n",
513 (unsigned long long)mtd
->size
, mtd
->erasesize
,
514 pgsize
, ebcnt
, pgcnt
, mtd
->oobsize
);
517 bufsize
= pgsize
* 2;
518 writebuf
= kmalloc(mtd
->erasesize
, GFP_KERNEL
);
520 pr_err("error: cannot allocate memory\n");
523 twopages
= kmalloc(bufsize
, GFP_KERNEL
);
525 pr_err("error: cannot allocate memory\n");
528 boundary
= kmalloc(bufsize
, GFP_KERNEL
);
530 pr_err("error: cannot allocate memory\n");
534 err
= scan_for_bad_eraseblocks();
538 /* Erase all eraseblocks */
539 pr_info("erasing whole device\n");
540 for (i
= 0; i
< ebcnt
; ++i
) {
543 err
= erase_eraseblock(i
);
548 pr_info("erased %u eraseblocks\n", i
);
550 /* Write all eraseblocks */
551 prandom_seed_state(&rnd_state
, 1);
552 pr_info("writing whole device\n");
553 for (i
= 0; i
< ebcnt
; ++i
) {
556 err
= write_eraseblock(i
);
560 pr_info("written up to eraseblock %u\n", i
);
563 pr_info("written %u eraseblocks\n", i
);
565 /* Check all eraseblocks */
566 prandom_seed_state(&rnd_state
, 1);
567 pr_info("verifying all eraseblocks\n");
568 for (i
= 0; i
< ebcnt
; ++i
) {
571 err
= verify_eraseblock(i
);
575 pr_info("verified up to eraseblock %u\n", i
);
578 pr_info("verified %u eraseblocks\n", i
);
584 err
= erasecrosstest();
592 pr_info("finished with %d errors\n", errcnt
);
601 pr_info("error %d occurred\n", err
);
602 printk(KERN_INFO
"=================================================\n");
605 module_init(mtd_pagetest_init
);
607 static void __exit
mtd_pagetest_exit(void)
611 module_exit(mtd_pagetest_exit
);
613 MODULE_DESCRIPTION("NAND page test");
614 MODULE_AUTHOR("Adrian Hunter");
615 MODULE_LICENSE("GPL");