diff options
| -rw-r--r-- | drivers/mtd/tests/mtd_subpagetest.c | 525 |
1 files changed, 525 insertions, 0 deletions
diff --git a/drivers/mtd/tests/mtd_subpagetest.c b/drivers/mtd/tests/mtd_subpagetest.c new file mode 100644 index 00000000000..4c5e04d0b32 --- /dev/null +++ b/drivers/mtd/tests/mtd_subpagetest.c @@ -0,0 +1,525 @@ +/* + * Copyright (C) 2006-2007 Nokia Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; see the file COPYING. If not, write to the Free Software + * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Test sub-page read and write on MTD device. + * Author: Adrian Hunter <ext-adrian.hunter@nokia.com> + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/err.h> +#include <linux/mtd/mtd.h> +#include <linux/sched.h> + +#define PRINT_PREF KERN_INFO "mtd_subpagetest: " + +static int dev; +module_param(dev, int, S_IRUGO); +MODULE_PARM_DESC(dev, "MTD device number to use"); + +static struct mtd_info *mtd; +static unsigned char *writebuf; +static unsigned char *readbuf; +static unsigned char *bbt; + +static int subpgsize; +static int bufsize; +static int ebcnt; +static int pgcnt; +static int errcnt; +static unsigned long next = 1; + +static inline unsigned int simple_rand(void) +{ + next = next * 1103515245 + 12345; + return (unsigned int)((next / 65536) % 32768); +} + +static inline void simple_srand(unsigned long seed) +{ + next = seed; +} + +static void set_random_data(unsigned char *buf, size_t len) +{ + size_t i; + + for (i = 0; i < len; ++i) + buf[i] = simple_rand(); +} + +static inline void clear_data(unsigned char *buf, size_t len) +{ + memset(buf, 0, len); +} + +static int erase_eraseblock(int ebnum) +{ + int err; + struct erase_info ei; + loff_t addr = ebnum * mtd->erasesize; + + memset(&ei, 0, sizeof(struct erase_info)); + ei.mtd = mtd; + ei.addr = addr; + ei.len = mtd->erasesize; + + err = mtd->erase(mtd, &ei); + if (err) { + printk(PRINT_PREF "error %d while erasing EB %d\n", err, ebnum); + return err; + } + + if (ei.state == MTD_ERASE_FAILED) { + printk(PRINT_PREF "some erase error occurred at EB %d\n", + ebnum); + return -EIO; + } + + return 0; +} + +static int erase_whole_device(void) +{ + int err; + unsigned int i; + + printk(PRINT_PREF "erasing whole device\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = erase_eraseblock(i); + if (err) + return err; + cond_resched(); + } + printk(PRINT_PREF "erased %u eraseblocks\n", i); + return 0; +} + +static int write_eraseblock(int ebnum) +{ + size_t written = 0; + int err = 0; + loff_t addr = ebnum * mtd->erasesize; + + set_random_data(writebuf, subpgsize); + err = mtd->write(mtd, addr, subpgsize, &written, writebuf); + if (unlikely(err || written != subpgsize)) { + printk(PRINT_PREF "error: write failed at %#llx\n", + (long long)addr); + if (written != subpgsize) { + printk(PRINT_PREF " write size: %#x\n", subpgsize); + printk(PRINT_PREF " written: %#x\n", written); + } + return err ? err : -1; + } + + addr += subpgsize; + + set_random_data(writebuf, subpgsize); + err = mtd->write(mtd, addr, subpgsize, &written, writebuf); + if (unlikely(err || written != subpgsize)) { + printk(PRINT_PREF "error: write failed at %#llx\n", + (long long)addr); + if (written != subpgsize) { + printk(PRINT_PREF " write size: %#x\n", subpgsize); + printk(PRINT_PREF " written: %#x\n", written); + } + return err ? err : -1; + } + + return err; +} + +static int write_eraseblock2(int ebnum) +{ + size_t written = 0; + int err = 0, k; + loff_t addr = ebnum * mtd->erasesize; + + for (k = 1; k < 33; ++k) { + if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize) + break; + set_random_data(writebuf, subpgsize * k); + err = mtd->write(mtd, addr, subpgsize * k, &written, writebuf); + if (unlikely(err || written != subpgsize * k)) { + printk(PRINT_PREF "error: write failed at %#llx\n", + (long long)addr); + if (written != subpgsize) { + printk(PRINT_PREF " write size: %#x\n", + subpgsize * k); + printk(PRINT_PREF " written: %#08x\n", + written); + } + return err ? err : -1; + } + addr += subpgsize * k; + } + + return err; +} + +static void print_subpage(unsigned char *p) +{ + int i, j; + + for (i = 0; i < subpgsize; ) { + for (j = 0; i < subpgsize && j < 32; ++i, ++j) + printk("%02x", *p++); + printk("\n"); + } +} + +static int verify_eraseblock(int ebnum) +{ + size_t read = 0; + int err = 0; + loff_t addr = ebnum * mtd->erasesize; + + set_random_data(writebuf, subpgsize); + clear_data(readbuf, subpgsize); + read = 0; + err = mtd->read(mtd, addr, subpgsize, &read, readbuf); + if (unlikely(err || read != subpgsize)) { + if (err == -EUCLEAN && read == subpgsize) { + printk(PRINT_PREF "ECC correction at %#llx\n", + (long long)addr); + err = 0; + } else { + printk(PRINT_PREF "error: read failed at %#llx\n", + (long long)addr); + return err ? err : -1; + } + } + if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { + printk(PRINT_PREF "error: verify failed at %#llx\n", + (long long)addr); + printk(PRINT_PREF "------------- written----------------\n"); + print_subpage(writebuf); + printk(PRINT_PREF "------------- read ------------------\n"); + print_subpage(readbuf); + printk(PRINT_PREF "-------------------------------------\n"); + errcnt += 1; + } + + addr += subpgsize; + + set_random_data(writebuf, subpgsize); + clear_data(readbuf, subpgsize); + read = 0; + err = mtd->read(mtd, addr, subpgsize, &read, readbuf); + if (unlikely(err || read != subpgsize)) { + if (err == -EUCLEAN && read == subpgsize) { + printk(PRINT_PREF "ECC correction at %#llx\n", + (long long)addr); + err = 0; + } else { + printk(PRINT_PREF "error: read failed at %#llx\n", + (long long)addr); + return err ? err : -1; + } + } + if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { + printk(PRINT_PREF "error: verify failed at %#llx\n", + (long long)addr); + printk(PRINT_PREF "------------- written----------------\n"); + print_subpage(writebuf); + printk(PRINT_PREF "------------- read ------------------\n"); + print_subpage(readbuf); + printk(PRINT_PREF "-------------------------------------\n"); + errcnt += 1; + } + + return err; +} + +static int verify_eraseblock2(int ebnum) +{ + size_t read = 0; + int err = 0, k; + loff_t addr = ebnum * mtd->erasesize; + + for (k = 1; k < 33; ++k) { + if (addr + (subpgsize * k) > (ebnum + 1) * mtd->erasesize) + break; + set_random_data(writebuf, subpgsize * k); + clear_data(readbuf, subpgsize * k); + read = 0; + err = mtd->read(mtd, addr, subpgsize * k, &read, readbuf); + if (unlikely(err || read != subpgsize * k)) { + if (err == -EUCLEAN && read == subpgsize * k) { + printk(PRINT_PREF "ECC correction at %#llx\n", + (long long)addr); + err = 0; + } else { + printk(PRINT_PREF "error: read failed at " + "%#llx\n", (long long)addr); + return err ? err : -1; + } + } + if (unlikely(memcmp(readbuf, writebuf, subpgsize * k))) { + printk(PRINT_PREF "error: verify failed at %#llx\n", + (long long)addr); + errcnt += 1; + } + addr += subpgsize * k; + } + + return err; +} + +static int verify_eraseblock_ff(int ebnum) +{ + uint32_t j; + size_t read = 0; + int err = 0; + loff_t addr = ebnum * mtd->erasesize; + + memset(writebuf, 0xff, subpgsize); + for (j = 0; j < mtd->erasesize / subpgsize; ++j) { + clear_data(readbuf, subpgsize); + read = 0; + err = mtd->read(mtd, addr, subpgsize, &read, readbuf); + if (unlikely(err || read != subpgsize)) { + if (err == -EUCLEAN && read == subpgsize) { + printk(PRINT_PREF "ECC correction at %#llx\n", + (long long)addr); + err = 0; + } else { + printk(PRINT_PREF "error: read failed at " + "%#llx\n", (long long)addr); + return err ? err : -1; + } + } + if (unlikely(memcmp(readbuf, writebuf, subpgsize))) { + printk(PRINT_PREF "error: verify 0xff failed at " + "%#llx\n", (long long)addr); + errcnt += 1; + } + addr += subpgsize; + } + + return err; +} + +static int verify_all_eraseblocks_ff(void) +{ + int err; + unsigned int i; + + printk(PRINT_PREF "verifying all eraseblocks for 0xff\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = verify_eraseblock_ff(i); + if (err) + return err; + if (i % 256 == 0) + printk(PRINT_PREF "verified up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "verified %u eraseblocks\n", i); + return 0; +} + +static int is_block_bad(int ebnum) +{ + loff_t addr = ebnum * mtd->erasesize; + int ret; + + ret = mtd->block_isbad(mtd, addr); + if (ret) + printk(PRINT_PREF "block %d is bad\n", ebnum); + return ret; +} + +static int scan_for_bad_eraseblocks(void) +{ + int i, bad = 0; + + bbt = kmalloc(ebcnt, GFP_KERNEL); + if (!bbt) { + printk(PRINT_PREF "error: cannot allocate memory\n"); + return -ENOMEM; + } + memset(bbt, 0 , ebcnt); + + printk(PRINT_PREF "scanning for bad eraseblocks\n"); + for (i = 0; i < ebcnt; ++i) { + bbt[i] = is_block_bad(i) ? 1 : 0; + if (bbt[i]) + bad += 1; + cond_resched(); + } + printk(PRINT_PREF "scanned %d eraseblocks, %d are bad\n", i, bad); + return 0; +} + +static int __init mtd_subpagetest_init(void) +{ + int err = 0; + uint32_t i; + uint64_t tmp; + + printk(KERN_INFO "\n"); + printk(KERN_INFO "=================================================\n"); + printk(PRINT_PREF "MTD device: %d\n", dev); + + mtd = get_mtd_device(NULL, dev); + if (IS_ERR(mtd)) { + err = PTR_ERR(mtd); + printk(PRINT_PREF "error: cannot get MTD device\n"); + return err; + } + + if (mtd->type != MTD_NANDFLASH) { + printk(PRINT_PREF "this test requires NAND flash\n"); + goto out; + } + + subpgsize = mtd->writesize >> mtd->subpage_sft; + printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, " + "page size %u, subpage size %u, count of eraseblocks %u, " + "pages per eraseblock %u, OOB size %u\n", + (unsigned long long)mtd->size, mtd->erasesize, + mtd->writesize, subpgsize, ebcnt, pgcnt, mtd->oobsize); + + err = -ENOMEM; + bufsize = subpgsize * 32; + writebuf = kmalloc(bufsize, GFP_KERNEL); + if (!writebuf) { + printk(PRINT_PREF "error: cannot allocate memory\n"); + goto out; + } + readbuf = kmalloc(bufsize, GFP_KERNEL); + if (!readbuf) { + printk(PRINT_PREF "error: cannot allocate memory\n"); + goto out; + } + + tmp = mtd->size; + do_div(tmp, mtd->erasesize); + ebcnt = tmp; + pgcnt = mtd->erasesize / mtd->writesize; + + err = scan_for_bad_eraseblocks(); + if (err) + goto out; + + err = erase_whole_device(); + if (err) + goto out; + + printk(PRINT_PREF "writing whole device\n"); + simple_srand(1); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = write_eraseblock(i); + if (unlikely(err)) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "written up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "written %u eraseblocks\n", i); + + simple_srand(1); + printk(PRINT_PREF "verifying all eraseblocks\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = verify_eraseblock(i); + if (unlikely(err)) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "verified up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "verified %u eraseblocks\n", i); + + err = erase_whole_device(); + if (err) + goto out; + + err = verify_all_eraseblocks_ff(); + if (err) + goto out; + + /* Write all eraseblocks */ + simple_srand(3); + printk(PRINT_PREF "writing whole device\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = write_eraseblock2(i); + if (unlikely(err)) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "written up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "written %u eraseblocks\n", i); + + /* Check all eraseblocks */ + simple_srand(3); + printk(PRINT_PREF "verifying all eraseblocks\n"); + for (i = 0; i < ebcnt; ++i) { + if (bbt[i]) + continue; + err = verify_eraseblock2(i); + if (unlikely(err)) + goto out; + if (i % 256 == 0) + printk(PRINT_PREF "verified up to eraseblock %u\n", i); + cond_resched(); + } + printk(PRINT_PREF "verified %u eraseblocks\n", i); + + err = erase_whole_device(); + if (err) + goto out; + + err = verify_all_eraseblocks_ff(); + if (err) + goto out; + + printk(PRINT_PREF "finished with %d errors\n", errcnt); + +out: + kfree(bbt); + kfree(readbuf); + kfree(writebuf); + put_mtd_device(mtd); + if (err) + printk(PRINT_PREF "error %d occurred\n", err); + printk(KERN_INFO "=================================================\n"); + return err; +} +module_init(mtd_subpagetest_init); + +static void __exit mtd_subpagetest_exit(void) +{ + return; +} +module_exit(mtd_subpagetest_exit); + +MODULE_DESCRIPTION("Subpage test module"); +MODULE_AUTHOR("Adrian Hunter"); +MODULE_LICENSE("GPL"); |