1/* 2 * Copyright (C) 2006-2008 Nokia Corporation 3 * 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. 7 * 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 11 * more details. 12 * 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. 16 * 17 * Test page read and write on MTD device. 18 * 19 * Author: Adrian Hunter <ext-adrian.hunter@nokia.com> 20 */ 21 22#include <asm/div64.h> 23#include <linux/init.h> 24#include <linux/module.h> 25#include <linux/moduleparam.h> 26#include <linux/err.h> 27#include <linux/mtd/mtd.h> 28#include <linux/slab.h> 29#include <linux/sched.h> 30 31#define PRINT_PREF KERN_INFO "mtd_pagetest: " 32 33static int dev; 34module_param(dev, int, S_IRUGO); 35MODULE_PARM_DESC(dev, "MTD device number to use"); 36 37static struct mtd_info *mtd; 38static unsigned char *twopages; 39static unsigned char *writebuf; 40static unsigned char *boundary; 41static unsigned char *bbt; 42 43static int pgsize; 44static int bufsize; 45static int ebcnt; 46static int pgcnt; 47static int errcnt; 48static unsigned long next = 1; 49 50static inline unsigned int simple_rand(void) 51{ 52 next = next * 1103515245 + 12345; 53 return (unsigned int)((next / 65536) % 32768); 54} 55 56static inline void simple_srand(unsigned long seed) 57{ 58 next = seed; 59} 60 61static void set_random_data(unsigned char *buf, size_t len) 62{ 63 size_t i; 64 65 for (i = 0; i < len; ++i) 66 buf[i] = simple_rand(); 67} 68 69static int erase_eraseblock(int ebnum) 70{ 71 int err; 72 struct erase_info ei; 73 loff_t addr = ebnum * mtd->erasesize; 74 75 memset(&ei, 0, sizeof(struct erase_info)); 76 ei.mtd = mtd; 77 ei.addr = addr; 78 ei.len = mtd->erasesize; 79 80 err = mtd->erase(mtd, &ei); 81 if (err) { 82 printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum); 83 return err; 84 } 85 86 if (ei.state == MTD_ERASE_FAILED) { 87 printk(PRINT_PREF "some erase error occurred at EB %d\n", 88 ebnum); 89 return -EIO; 90 } 91 92 return 0; 93} 94 95static int write_eraseblock(int ebnum) 96{ 97 int err = 0; 98 size_t written = 0; 99 loff_t addr = ebnum * mtd->erasesize; 100 101 set_random_data(writebuf, mtd->erasesize); 102 cond_resched(); 103 err = mtd->write(mtd, addr, mtd->erasesize, &written, writebuf); 104 if (err || written != mtd->erasesize) 105 printk(PRINT_PREF "error: write failed at %#llx\n", 106 (long long)addr); 107 108 return err; 109} 110 111static int verify_eraseblock(int ebnum) 112{ 113 uint32_t j; 114 size_t read = 0; 115 int err = 0, i; 116 loff_t addr0, addrn; 117 loff_t addr = ebnum * mtd->erasesize; 118 119 addr0 = 0; 120 for (i = 0; i < ebcnt && bbt[i]; ++i) 121 addr0 += mtd->erasesize; 122 123 addrn = mtd->size; 124 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i) 125 addrn -= mtd->erasesize; 126 127 set_random_data(writebuf, mtd->erasesize); 128 for (j = 0; j < pgcnt - 1; ++j, addr += pgsize) { 129 /* Do a read to set the internal dataRAMs to different data */ 130 err = mtd->read(mtd, addr0, bufsize, &read, twopages); 131 if (err == -EUCLEAN) 132 err = 0; 133 if (err || read != bufsize) { 134 printk(PRINT_PREF "error: read failed at %#llx\n", 135 (long long)addr0); 136 return err; 137 } 138 err = mtd->read(mtd, addrn - bufsize, bufsize, &read, twopages); 139 if (err == -EUCLEAN) 140 err = 0; 141 if (err || read != bufsize) { 142 printk(PRINT_PREF "error: read failed at %#llx\n", 143 (long long)(addrn - bufsize)); 144 return err; 145 } 146 memset(twopages, 0, bufsize); 147 read = 0; 148 err = mtd->read(mtd, addr, bufsize, &read, twopages); 149 if (err == -EUCLEAN) 150 err = 0; 151 if (err || read != bufsize) { 152 printk(PRINT_PREF "error: read failed at %#llx\n", 153 (long long)addr); 154 break; 155 } 156 if (memcmp(twopages, writebuf + (j * pgsize), bufsize)) { 157 printk(PRINT_PREF "error: verify failed at %#llx\n", 158 (long long)addr); 159 errcnt += 1; 160 } 161 } 162 /* Check boundary between eraseblocks */ 163 if (addr <= addrn - pgsize - pgsize && !bbt[ebnum + 1]) { 164 unsigned long oldnext = next; 165 /* Do a read to set the internal dataRAMs to different data */ 166 err = mtd->read(mtd, addr0, bufsize, &read, twopages); 167 if (err == -EUCLEAN) 168 err = 0; 169 if (err || read != bufsize) { 170 printk(PRINT_PREF "error: read failed at %#llx\n", 171 (long long)addr0); 172 return err; 173 } 174 err = mtd->read(mtd, addrn - bufsize, bufsize, &read, twopages); 175 if (err == -EUCLEAN) 176 err = 0; 177 if (err || read != bufsize) { 178 printk(PRINT_PREF "error: read failed at %#llx\n", 179 (long long)(addrn - bufsize)); 180 return err; 181 } 182 memset(twopages, 0, bufsize); 183 read = 0; 184 err = mtd->read(mtd, addr, bufsize, &read, twopages); 185 if (err == -EUCLEAN) 186 err = 0; 187 if (err || read != bufsize) { 188 printk(PRINT_PREF "error: read failed at %#llx\n", 189 (long long)addr); 190 return err; 191 } 192 memcpy(boundary, writebuf + mtd->erasesize - pgsize, pgsize); 193 set_random_data(boundary + pgsize, pgsize); 194 if (memcmp(twopages, boundary, bufsize)) { 195 printk(PRINT_PREF "error: verify failed at %#llx\n", 196 (long long)addr); 197 errcnt += 1; 198 } 199 next = oldnext; 200 } 201 return err; 202} 203 204static int crosstest(void) 205{ 206 size_t read = 0; 207 int err = 0, i; 208 loff_t addr, addr0, addrn; 209 unsigned char *pp1, *pp2, *pp3, *pp4; 210 211 printk(PRINT_PREF "crosstest\n"); 212 pp1 = kmalloc(pgsize * 4, GFP_KERNEL); 213 if (!pp1) { 214 printk(PRINT_PREF "error: cannot allocate memory\n"); 215 return -ENOMEM; 216 } 217 pp2 = pp1 + pgsize; 218 pp3 = pp2 + pgsize; 219 pp4 = pp3 + pgsize; 220 memset(pp1, 0, pgsize * 4); 221 222 addr0 = 0; 223 for (i = 0; i < ebcnt && bbt[i]; ++i) 224 addr0 += mtd->erasesize; 225 226 addrn = mtd->size; 227 for (i = 0; i < ebcnt && bbt[ebcnt - i - 1]; ++i) 228 addrn -= mtd->erasesize; 229 230 /* Read 2nd-to-last page to pp1 */ 231 read = 0; 232 addr = addrn - pgsize - pgsize; 233 err = mtd->read(mtd, addr, pgsize, &read, pp1); 234 if (err == -EUCLEAN) 235 err = 0; 236 if (err || read != pgsize) { 237 printk(PRINT_PREF "error: read failed at %#llx\n", 238 (long long)addr); 239 kfree(pp1); 240 return err; 241 } 242 243 /* Read 3rd-to-last page to pp1 */ 244 read = 0; 245 addr = addrn - pgsize - pgsize - pgsize; 246 err = mtd->read(mtd, addr, pgsize, &read, pp1); 247 if (err == -EUCLEAN) 248 err = 0; 249 if (err || read != pgsize) { 250 printk(PRINT_PREF "error: read failed at %#llx\n", 251 (long long)addr); 252 kfree(pp1); 253 return err; 254 } 255 256 /* Read first page to pp2 */ 257 read = 0; 258 addr = addr0; 259 printk(PRINT_PREF "reading page at %#llx\n", (long long)addr); 260 err = mtd->read(mtd, addr, pgsize, &read, pp2); 261 if (err == -EUCLEAN) 262 err = 0; 263 if (err || read != pgsize) { 264 printk(PRINT_PREF "error: read failed at %#llx\n", 265 (long long)addr); 266 kfree(pp1); 267 return err; 268 } 269 270 /* Read last page to pp3 */ 271 read = 0; 272 addr = addrn - pgsize; 273 printk(PRINT_PREF "reading page at %#llx\n", (long long)addr); 274 err = mtd->read(mtd, addr, pgsize, &read, pp3); 275 if (err == -EUCLEAN) 276 err = 0; 277 if (err || read != pgsize) { 278 printk(PRINT_PREF "error: read failed at %#llx\n", 279 (long long)addr); 280 kfree(pp1); 281 return err; 282 } 283 284 /* Read first page again to pp4 */ 285 read = 0; 286 addr = addr0; 287 printk(PRINT_PREF "reading page at %#llx\n", (long long)addr); 288 err = mtd->read(mtd, addr, pgsize, &read, pp4); 289 if (err == -EUCLEAN) 290 err = 0; 291 if (err || read != pgsize) { 292 printk(PRINT_PREF "error: read failed at %#llx\n", 293 (long long)addr); 294 kfree(pp1); 295 return err; 296 } 297 298 /* pp2 and pp4 should be the same */ 299 printk(PRINT_PREF "verifying pages read at %#llx match\n", 300 (long long)addr0); 301 if (memcmp(pp2, pp4, pgsize)) { 302 printk(PRINT_PREF "verify failed!\n"); 303 errcnt += 1; 304 } else if (!err) 305 printk(PRINT_PREF "crosstest ok\n"); 306 kfree(pp1); 307 return err; 308} 309 310static int erasecrosstest(void) 311{ 312 size_t read = 0, written = 0; 313 int err = 0, i, ebnum, ebnum2; 314 loff_t addr0; 315 char *readbuf = twopages; 316 317 printk(PRINT_PREF "erasecrosstest\n"); 318 319 ebnum = 0; 320 addr0 = 0; 321 for (i = 0; i < ebcnt && bbt[i]; ++i) { 322 addr0 += mtd->erasesize; 323 ebnum += 1; 324 } 325 326 ebnum2 = ebcnt - 1; 327 while (ebnum2 && bbt[ebnum2]) 328 ebnum2 -= 1; 329 330 printk(PRINT_PREF "erasing block %d\n", ebnum); 331 err = erase_eraseblock(ebnum); 332 if (err) 333 return err; 334 335 printk(PRINT_PREF "writing 1st page of block %d\n", ebnum); 336 set_random_data(writebuf, pgsize); 337 strcpy(writebuf, "There is no data like this!"); 338 err = mtd->write(mtd, addr0, pgsize, &written, writebuf); 339 if (err || written != pgsize) { 340 printk(PRINT_PREF "error: write failed at %#llx\n", 341 (long long)addr0); 342 return err ? err : -1; 343 } 344 345 printk(PRINT_PREF "reading 1st page of block %d\n", ebnum); 346 memset(readbuf, 0, pgsize); 347 err = mtd->read(mtd, addr0, pgsize, &read, readbuf); 348 if (err == -EUCLEAN) 349 err = 0; 350 if (err || read != pgsize) { 351 printk(PRINT_PREF "error: read failed at %#llx\n", 352 (long long)addr0); 353 return err ? err : -1; 354 } 355 356 printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum); 357 if (memcmp(writebuf, readbuf, pgsize)) { 358 printk(PRINT_PREF "verify failed!\n"); 359 errcnt += 1; 360 return -1; 361 } 362 363 printk(PRINT_PREF "erasing block %d\n", ebnum); 364 err = erase_eraseblock(ebnum); 365 if (err) 366 return err; 367 368 printk(PRINT_PREF "writing 1st page of block %d\n", ebnum); 369 set_random_data(writebuf, pgsize); 370 strcpy(writebuf, "There is no data like this!"); 371 err = mtd->write(mtd, addr0, pgsize, &written, writebuf); 372 if (err || written != pgsize) { 373 printk(PRINT_PREF "error: write failed at %#llx\n", 374 (long long)addr0); 375 return err ? err : -1; 376 } 377 378 printk(PRINT_PREF "erasing block %d\n", ebnum2); 379 err = erase_eraseblock(ebnum2); 380 if (err) 381 return err; 382 383 printk(PRINT_PREF "reading 1st page of block %d\n", ebnum); 384 memset(readbuf, 0, pgsize); 385 err = mtd->read(mtd, addr0, pgsize, &read, readbuf); 386 if (err == -EUCLEAN) 387 err = 0; 388 if (err || read != pgsize) { 389 printk(PRINT_PREF "error: read failed at %#llx\n", 390 (long long)addr0); 391 return err ? err : -1; 392 } 393 394 printk(PRINT_PREF "verifying 1st page of block %d\n", ebnum); 395 if (memcmp(writebuf, readbuf, pgsize)) { 396 printk(PRINT_PREF "verify failed!\n"); 397 errcnt += 1; 398 return -1; 399 } 400 401 if (!err) 402 printk(PRINT_PREF "erasecrosstest ok\n"); 403 return err; 404} 405 406static int erasetest(void) 407{ 408 size_t read = 0, written = 0; 409 int err = 0, i, ebnum, ok = 1; 410 loff_t addr0; 411 412 printk(PRINT_PREF "erasetest\n"); 413 414 ebnum = 0; 415 addr0 = 0; 416 for (i = 0; i < ebcnt && bbt[i]; ++i) { 417 addr0 += mtd->erasesize; 418 ebnum += 1; 419 } 420 421 printk(PRINT_PREF "erasing block %d\n", ebnum); 422 err = erase_eraseblock(ebnum); 423 if (err) 424 return err; 425 426 printk(PRINT_PREF "writing 1st page of block %d\n", ebnum); 427 set_random_data(writebuf, pgsize); 428 err = mtd->write(mtd, addr0, pgsize, &written, writebuf); 429 if (err || written != pgsize) { 430 printk(PRINT_PREF "error: write failed at %#llx\n", 431 (long long)addr0); 432 return err ? err : -1; 433 } 434 435 printk(PRINT_PREF "erasing block %d\n", ebnum); 436 err = erase_eraseblock(ebnum); 437 if (err) 438 return err; 439 440 printk(PRINT_PREF "reading 1st page of block %d\n", ebnum); 441 err = mtd->read(mtd, addr0, pgsize, &read, twopages); 442 if (err == -EUCLEAN) 443 err = 0; 444 if (err || read != pgsize) { 445 printk(PRINT_PREF "error: read failed at %#llx\n", 446 (long long)addr0); 447 return err ? err : -1; 448 } 449 450 printk(PRINT_PREF "verifying 1st page of block %d is all 0xff\n", 451 ebnum); 452 for (i = 0; i < pgsize; ++i) 453 if (twopages[i] != 0xff) { 454 printk(PRINT_PREF "verifying all 0xff failed at %d\n", 455 i); 456 errcnt += 1; 457 ok = 0; 458 break; 459 } 460 461 if (ok && !err) 462 printk(PRINT_PREF "erasetest ok\n"); 463 464 return err; 465} 466 467static int is_block_bad(int ebnum) 468{ 469 loff_t addr = ebnum * mtd->erasesize; 470 int ret; 471 472 ret = mtd->block_isbad(mtd, addr); 473 if (ret) 474 printk(PRINT_PREF "block %d is bad\n", ebnum); 475 return ret; 476} 477 478static int scan_for_bad_eraseblocks(void) 479{ 480 int i, bad = 0; 481 482 bbt = kzalloc(ebcnt, GFP_KERNEL); 483 if (!bbt) { 484 printk(PRINT_PREF "error: cannot allocate memory\n"); 485 return -ENOMEM; 486 } 487 488 printk(PRINT_PREF "scanning for bad eraseblocks\n"); 489 for (i = 0; i < ebcnt; ++i) { 490 bbt[i] = is_block_bad(i) ? 1 : 0; 491 if (bbt[i]) 492 bad += 1; 493 cond_resched(); 494 } 495 printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad); 496 return 0; 497} 498 499static int __init mtd_pagetest_init(void) 500{ 501 int err = 0; 502 uint64_t tmp; 503 uint32_t i; 504 505 printk(KERN_INFO "\n"); 506 printk(KERN_INFO "=================================================\n"); 507 printk(PRINT_PREF "MTD device: %d\n", dev); 508 509 mtd = get_mtd_device(NULL, dev); 510 if (IS_ERR(mtd)) { 511 err = PTR_ERR(mtd); 512 printk(PRINT_PREF "error: cannot get MTD device\n"); 513 return err; 514 } 515 516 if (mtd->type != MTD_NANDFLASH) { 517 printk(PRINT_PREF "this test requires NAND flash\n"); 518 goto out; 519 } 520 521 tmp = mtd->size; 522 do_div(tmp, mtd->erasesize); 523 ebcnt = tmp; 524 pgcnt = mtd->erasesize / mtd->writesize; 525 pgsize = mtd->writesize; 526 527 printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, " 528 "page size %u, count of eraseblocks %u, pages per " 529 "eraseblock %u, OOB size %u\n", 530 (unsigned long long)mtd->size, mtd->erasesize, 531 pgsize, ebcnt, pgcnt, mtd->oobsize); 532 533 err = -ENOMEM; 534 bufsize = pgsize * 2; 535 writebuf = kmalloc(mtd->erasesize, GFP_KERNEL); 536 if (!writebuf) { 537 printk(PRINT_PREF "error: cannot allocate memory\n"); 538 goto out; 539 } 540 twopages = kmalloc(bufsize, GFP_KERNEL); 541 if (!twopages) { 542 printk(PRINT_PREF "error: cannot allocate memory\n"); 543 goto out; 544 } 545 boundary = kmalloc(bufsize, GFP_KERNEL); 546 if (!boundary) { 547 printk(PRINT_PREF "error: cannot allocate memory\n"); 548 goto out; 549 } 550 551 err = scan_for_bad_eraseblocks(); 552 if (err) 553 goto out; 554 555 /* Erase all eraseblocks */ 556 printk(PRINT_PREF "erasing whole device\n"); 557 for (i = 0; i < ebcnt; ++i) { 558 if (bbt[i]) 559 continue; 560 err = erase_eraseblock(i); 561 if (err) 562 goto out; 563 cond_resched(); 564 } 565 printk(PRINT_PREF "erased %u eraseblocks\n", i); 566 567 /* Write all eraseblocks */ 568 simple_srand(1); 569 printk(PRINT_PREF "writing whole device\n"); 570 for (i = 0; i < ebcnt; ++i) { 571 if (bbt[i]) 572 continue; 573 err = write_eraseblock(i); 574 if (err) 575 goto out; 576 if (i % 256 == 0) 577 printk(PRINT_PREF "written up to eraseblock %u\n", i); 578 cond_resched(); 579 } 580 printk(PRINT_PREF "written %u eraseblocks\n", i); 581 582 /* Check all eraseblocks */ 583 simple_srand(1); 584 printk(PRINT_PREF "verifying all eraseblocks\n"); 585 for (i = 0; i < ebcnt; ++i) { 586 if (bbt[i]) 587 continue; 588 err = verify_eraseblock(i); 589 if (err) 590 goto out; 591 if (i % 256 == 0) 592 printk(PRINT_PREF "verified up to eraseblock %u\n", i); 593 cond_resched(); 594 } 595 printk(PRINT_PREF "verified %u eraseblocks\n", i); 596 597 err = crosstest(); 598 if (err) 599 goto out; 600 601 err = erasecrosstest(); 602 if (err) 603 goto out; 604 605 err = erasetest(); 606 if (err) 607 goto out; 608 609 printk(PRINT_PREF "finished with %d errors\n", errcnt); 610out: 611 612 kfree(bbt); 613 kfree(boundary); 614 kfree(twopages); 615 kfree(writebuf); 616 put_mtd_device(mtd); 617 if (err) 618 printk(PRINT_PREF "error %d occurred\n", err); 619 printk(KERN_INFO "=================================================\n"); 620 return err; 621} 622module_init(mtd_pagetest_init); 623 624static void __exit mtd_pagetest_exit(void) 625{ 626 return; 627} 628module_exit(mtd_pagetest_exit); 629 630MODULE_DESCRIPTION("NAND page test"); 631MODULE_AUTHOR("Adrian Hunter"); 632MODULE_LICENSE("GPL"); 633