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>
36 static int dev = -EINVAL;
37 module_param(dev, int, S_IRUGO);
38 MODULE_PARM_DESC(dev, "MTD device number to use");
40 static struct mtd_info *mtd;
41 static unsigned char *twopages;
42 static unsigned char *writebuf;
43 static unsigned char *boundary;
44 static unsigned char *bbt;
51 static struct rnd_state rnd_state;
53 static int write_eraseblock(int ebnum)
55 loff_t addr = ebnum * mtd->erasesize;
57 prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
59 return mtdtest_write(mtd, addr, mtd->erasesize, writebuf);
62 static int verify_eraseblock(int ebnum)
67 loff_t addr = ebnum * mtd->erasesize;
70 for (i = 0; i < ebcnt && bbt[i]; ++i)
71 addr0 += mtd->erasesize;
74 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
75 addrn -= mtd->erasesize;
77 prandom_bytes_state(&rnd_state, writebuf, mtd->erasesize);
78 for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) {
79 /* Do a read to set the internal dataRAMs to different data */
80 err = mtdtest_read(mtd, addr0, bufsize, twopages);
83 err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
86 memset(twopages, 0, bufsize);
87 err = mtdtest_read(mtd, addr, bufsize, twopages);
90 if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) {
91 pr_err("error: verify failed at %#llx\n",
96 /* Check boundary between eraseblocks */
97 if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) {
98 struct rnd_state old_state = rnd_state;
100 /* Do a read to set the internal dataRAMs to different data */
101 err = mtdtest_read(mtd, addr0, bufsize, twopages);
104 err = mtdtest_read(mtd, addrn - bufsize, bufsize, twopages);
107 memset(twopages, 0, bufsize);
108 err = mtdtest_read(mtd, addr, bufsize, twopages);
111 memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize);
112 prandom_bytes_state(&rnd_state, boundary + pgsize, pgsize);
113 if (memcmp(twopages, boundary, bufsize)) {
114 pr_err("error: verify failed at %#llx\n",
118 rnd_state = old_state;
123 static int crosstest(void)
126 loff_t addr, addr0, addrn;
127 unsigned char *pp1, *pp2, *pp3, *pp4;
129 pr_info("crosstest\n");
130 pp1 = kmalloc(pgsize * 4, GFP_KERNEL);
136 memset(pp1, 0, pgsize * 4);
139 for (i = 0; i < ebcnt && bbt[i]; ++i)
140 addr0 += mtd->erasesize;
143 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i)
144 addrn -= mtd->erasesize;
146 /* Read 2nd-to-last page to pp1 */
147 addr = addrn - pgsize - pgsize;
148 err = mtdtest_read(mtd, addr, pgsize, pp1);
154 /* Read 3rd-to-last page to pp1 */
155 addr = addrn - pgsize - pgsize - pgsize;
156 err = mtdtest_read(mtd, addr, pgsize, pp1);
162 /* Read first page to pp2 */
164 pr_info("reading page at %#llx\n", (long long)addr);
165 err = mtdtest_read(mtd, addr, pgsize, pp2);
171 /* Read last page to pp3 */
172 addr = addrn - pgsize;
173 pr_info("reading page at %#llx\n", (long long)addr);
174 err = mtdtest_read(mtd, addr, pgsize, pp3);
180 /* Read first page again to pp4 */
182 pr_info("reading page at %#llx\n", (long long)addr);
183 err = mtdtest_read(mtd, addr, pgsize, pp4);
189 /* pp2 and pp4 should be the same */
190 pr_info("verifying pages read at %#llx match\n",
192 if (memcmp(pp2, pp4, pgsize)) {
193 pr_err("verify failed!\n");
196 pr_info("crosstest ok\n");
201 static int erasecrosstest(void)
203 int err = 0, i, ebnum, ebnum2;
205 char *readbuf = twopages;
207 pr_info("erasecrosstest\n");
211 for (i = 0; i < ebcnt && bbt[i]; ++i) {
212 addr0 += mtd->erasesize;
217 while (ebnum2 && bbt[ebnum2])
220 pr_info("erasing block %d\n", ebnum);
221 err = mtdtest_erase_eraseblock(mtd, ebnum);
225 pr_info("writing 1st page of block %d\n", ebnum);
226 prandom_bytes_state(&rnd_state, writebuf, pgsize);
227 strcpy(writebuf, "There is no data like this!");
228 err = mtdtest_write(mtd, addr0, pgsize, writebuf);
232 pr_info("reading 1st page of block %d\n", ebnum);
233 memset(readbuf, 0, pgsize);
234 err = mtdtest_read(mtd, addr0, pgsize, readbuf);
238 pr_info("verifying 1st page of block %d\n", ebnum);
239 if (memcmp(writebuf, readbuf, pgsize)) {
240 pr_err("verify failed!\n");
245 pr_info("erasing block %d\n", ebnum);
246 err = mtdtest_erase_eraseblock(mtd, ebnum);
250 pr_info("writing 1st page of block %d\n", ebnum);
251 prandom_bytes_state(&rnd_state, writebuf, pgsize);
252 strcpy(writebuf, "There is no data like this!");
253 err = mtdtest_write(mtd, addr0, pgsize, writebuf);
257 pr_info("erasing block %d\n", ebnum2);
258 err = mtdtest_erase_eraseblock(mtd, ebnum2);
262 pr_info("reading 1st page of block %d\n", ebnum);
263 memset(readbuf, 0, pgsize);
264 err = mtdtest_read(mtd, addr0, pgsize, readbuf);
268 pr_info("verifying 1st page of block %d\n", ebnum);
269 if (memcmp(writebuf, readbuf, pgsize)) {
270 pr_err("verify failed!\n");
276 pr_info("erasecrosstest ok\n");
280 static int erasetest(void)
282 int err = 0, i, ebnum, ok = 1;
285 pr_info("erasetest\n");
289 for (i = 0; i < ebcnt && bbt[i]; ++i) {
290 addr0 += mtd->erasesize;
294 pr_info("erasing block %d\n", ebnum);
295 err = mtdtest_erase_eraseblock(mtd, ebnum);
299 pr_info("writing 1st page of block %d\n", ebnum);
300 prandom_bytes_state(&rnd_state, writebuf, pgsize);
301 err = mtdtest_write(mtd, addr0, pgsize, writebuf);
305 pr_info("erasing block %d\n", ebnum);
306 err = mtdtest_erase_eraseblock(mtd, ebnum);
310 pr_info("reading 1st page of block %d\n", ebnum);
311 err = mtdtest_read(mtd, addr0, pgsize, twopages);
315 pr_info("verifying 1st page of block %d is all 0xff\n",
317 for (i = 0; i < pgsize; ++i)
318 if (twopages[i] != 0xff) {
319 pr_err("verifying all 0xff failed at %d\n",
327 pr_info("erasetest ok\n");
332 static int __init mtd_pagetest_init(void)
338 printk(KERN_INFO "\n");
339 printk(KERN_INFO "=================================================\n");
342 pr_info("Please specify a valid mtd-device via module parameter\n");
343 pr_crit("CAREFUL: This test wipes all data on the specified MTD device!\n");
347 pr_info("MTD device: %d\n", dev);
349 mtd = get_mtd_device(NULL, dev);
352 pr_err("error: cannot get MTD device\n");
356 if (!mtd_type_is_nand(mtd)) {
357 pr_info("this test requires NAND flash\n");
362 do_div(tmp, mtd->erasesize);
364 pgcnt = mtd->erasesize / mtd->writesize;
365 pgsize = mtd->writesize;
367 pr_info("MTD device size %llu, eraseblock size %u, "
368 "page size %u, count of eraseblocks %u, pages per "
369 "eraseblock %u, OOB size %u\n",
370 (unsigned long long)mtd->size, mtd->erasesize,
371 pgsize, ebcnt, pgcnt, mtd->oobsize);
374 bufsize = pgsize * 2;
375 writebuf = kmalloc(mtd->erasesize, GFP_KERNEL);
378 twopages = kmalloc(bufsize, GFP_KERNEL);
381 boundary = kmalloc(bufsize, GFP_KERNEL);
385 bbt = kzalloc(ebcnt, GFP_KERNEL);
388 err = mtdtest_scan_for_bad_eraseblocks(mtd, bbt, 0, ebcnt);
392 /* Erase all eraseblocks */
393 pr_info("erasing whole device\n");
394 err = mtdtest_erase_good_eraseblocks(mtd, bbt, 0, ebcnt);
397 pr_info("erased %u eraseblocks\n", ebcnt);
399 /* Write all eraseblocks */
400 prandom_seed_state(&rnd_state, 1);
401 pr_info("writing whole device\n");
402 for (i = 0; i < ebcnt; ++i) {
405 err = write_eraseblock(i);
409 pr_info("written up to eraseblock %u\n", i);
412 pr_info("written %u eraseblocks\n", i);
414 /* Check all eraseblocks */
415 prandom_seed_state(&rnd_state, 1);
416 pr_info("verifying all eraseblocks\n");
417 for (i = 0; i < ebcnt; ++i) {
420 err = verify_eraseblock(i);
424 pr_info("verified up to eraseblock %u\n", i);
427 pr_info("verified %u eraseblocks\n", i);
433 err = erasecrosstest();
441 pr_info("finished with %d errors\n", errcnt);
450 pr_info("error %d occurred\n", err);
451 printk(KERN_INFO "=================================================\n");
454 module_init(mtd_pagetest_init);
456 static void __exit mtd_pagetest_exit(void)
460 module_exit(mtd_pagetest_exit);
462 MODULE_DESCRIPTION("NAND page test");
463 MODULE_AUTHOR("Adrian Hunter");
464 MODULE_LICENSE("GPL");