| /* |
| * Copyright (C) 2006-2008 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. |
| * |
| * Check MTD device read. |
| * |
| * 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/slab.h> |
| #include <linux/sched.h> |
| |
| #define PRINT_PREF KERN_INFO "mtd_readtest: " |
| |
| static int dev = -EINVAL; |
| module_param(dev, int, S_IRUGO); |
| MODULE_PARM_DESC(dev, "MTD device number to use"); |
| |
| static struct mtd_info *mtd; |
| static unsigned char *iobuf; |
| static unsigned char *iobuf1; |
| static unsigned char *bbt; |
| |
| static int pgsize; |
| static int ebcnt; |
| static int pgcnt; |
| |
| static int read_eraseblock_by_page(int ebnum) |
| { |
| size_t read = 0; |
| int i, ret, err = 0; |
| loff_t addr = ebnum * mtd->erasesize; |
| void *buf = iobuf; |
| void *oobbuf = iobuf1; |
| |
| for (i = 0; i < pgcnt; i++) { |
| memset(buf, 0 , pgcnt); |
| ret = mtd_read(mtd, addr, pgsize, &read, buf); |
| if (ret == -EUCLEAN) |
| ret = 0; |
| if (ret || read != pgsize) { |
| printk(PRINT_PREF "error: read failed at %#llx\n", |
| (long long)addr); |
| if (!err) |
| err = ret; |
| if (!err) |
| err = -EINVAL; |
| } |
| if (mtd->oobsize) { |
| struct mtd_oob_ops ops; |
| |
| ops.mode = MTD_OPS_PLACE_OOB; |
| ops.len = 0; |
| ops.retlen = 0; |
| ops.ooblen = mtd->oobsize; |
| ops.oobretlen = 0; |
| ops.ooboffs = 0; |
| ops.datbuf = NULL; |
| ops.oobbuf = oobbuf; |
| ret = mtd_read_oob(mtd, addr, &ops); |
| if ((ret && !mtd_is_bitflip(ret)) || |
| ops.oobretlen != mtd->oobsize) { |
| printk(PRINT_PREF "error: read oob failed at " |
| "%#llx\n", (long long)addr); |
| if (!err) |
| err = ret; |
| if (!err) |
| err = -EINVAL; |
| } |
| oobbuf += mtd->oobsize; |
| } |
| addr += pgsize; |
| buf += pgsize; |
| } |
| |
| return err; |
| } |
| |
| static void dump_eraseblock(int ebnum) |
| { |
| int i, j, n; |
| char line[128]; |
| int pg, oob; |
| |
| printk(PRINT_PREF "dumping eraseblock %d\n", ebnum); |
| n = mtd->erasesize; |
| for (i = 0; i < n;) { |
| char *p = line; |
| |
| p += sprintf(p, "%05x: ", i); |
| for (j = 0; j < 32 && i < n; j++, i++) |
| p += sprintf(p, "%02x", (unsigned int)iobuf[i]); |
| printk(KERN_CRIT "%s\n", line); |
| cond_resched(); |
| } |
| if (!mtd->oobsize) |
| return; |
| printk(PRINT_PREF "dumping oob from eraseblock %d\n", ebnum); |
| n = mtd->oobsize; |
| for (pg = 0, i = 0; pg < pgcnt; pg++) |
| for (oob = 0; oob < n;) { |
| char *p = line; |
| |
| p += sprintf(p, "%05x: ", i); |
| for (j = 0; j < 32 && oob < n; j++, oob++, i++) |
| p += sprintf(p, "%02x", |
| (unsigned int)iobuf1[i]); |
| printk(KERN_CRIT "%s\n", line); |
| cond_resched(); |
| } |
| } |
| |
| 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 = kzalloc(ebcnt, GFP_KERNEL); |
| if (!bbt) { |
| printk(PRINT_PREF "error: cannot allocate memory\n"); |
| return -ENOMEM; |
| } |
| |
| /* NOR flash does not implement block_isbad */ |
| if (mtd->block_isbad == NULL) |
| return 0; |
| |
| 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_readtest_init(void) |
| { |
| uint64_t tmp; |
| int err, i; |
| |
| printk(KERN_INFO "\n"); |
| printk(KERN_INFO "=================================================\n"); |
| |
| if (dev < 0) { |
| printk(PRINT_PREF "Please specify a valid mtd-device via module paramter\n"); |
| return -EINVAL; |
| } |
| |
| 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->writesize == 1) { |
| printk(PRINT_PREF "not NAND flash, assume page size is 512 " |
| "bytes.\n"); |
| pgsize = 512; |
| } else |
| pgsize = mtd->writesize; |
| |
| tmp = mtd->size; |
| do_div(tmp, mtd->erasesize); |
| ebcnt = tmp; |
| pgcnt = mtd->erasesize / pgsize; |
| |
| printk(PRINT_PREF "MTD device size %llu, eraseblock size %u, " |
| "page size %u, count of eraseblocks %u, pages per " |
| "eraseblock %u, OOB size %u\n", |
| (unsigned long long)mtd->size, mtd->erasesize, |
| pgsize, ebcnt, pgcnt, mtd->oobsize); |
| |
| err = -ENOMEM; |
| iobuf = kmalloc(mtd->erasesize, GFP_KERNEL); |
| if (!iobuf) { |
| printk(PRINT_PREF "error: cannot allocate memory\n"); |
| goto out; |
| } |
| iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL); |
| if (!iobuf1) { |
| printk(PRINT_PREF "error: cannot allocate memory\n"); |
| goto out; |
| } |
| |
| err = scan_for_bad_eraseblocks(); |
| if (err) |
| goto out; |
| |
| /* Read all eraseblocks 1 page at a time */ |
| printk(PRINT_PREF "testing page read\n"); |
| for (i = 0; i < ebcnt; ++i) { |
| int ret; |
| |
| if (bbt[i]) |
| continue; |
| ret = read_eraseblock_by_page(i); |
| if (ret) { |
| dump_eraseblock(i); |
| if (!err) |
| err = ret; |
| } |
| cond_resched(); |
| } |
| |
| if (err) |
| printk(PRINT_PREF "finished with errors\n"); |
| else |
| printk(PRINT_PREF "finished\n"); |
| |
| out: |
| |
| kfree(iobuf); |
| kfree(iobuf1); |
| kfree(bbt); |
| put_mtd_device(mtd); |
| if (err) |
| printk(PRINT_PREF "error %d occurred\n", err); |
| printk(KERN_INFO "=================================================\n"); |
| return err; |
| } |
| module_init(mtd_readtest_init); |
| |
| static void __exit mtd_readtest_exit(void) |
| { |
| return; |
| } |
| module_exit(mtd_readtest_exit); |
| |
| MODULE_DESCRIPTION("Read test module"); |
| MODULE_AUTHOR("Adrian Hunter"); |
| MODULE_LICENSE("GPL"); |