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/*
* 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>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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>
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;
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 , pgsize);
ret = mtd_read(mtd, addr, pgsize, &read, buf);
if (ret == -EUCLEAN)
ret = 0;
if (ret || read != pgsize) {
pr_err("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) {
pr_err("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;
pr_info("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;
pr_info("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)
pr_info("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)
return -ENOMEM;
if (!mtd_can_have_bb(mtd))
return 0;
pr_info("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();
}
pr_info("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) {
pr_info("Please specify a valid mtd-device via module parameter\n");
return -EINVAL;
}
pr_info("MTD device: %d\n", dev);
mtd = get_mtd_device(NULL, dev);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
pr_err("error: Cannot get MTD device\n");
return err;
}
if (mtd->writesize == 1) {
pr_info("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;
pr_info("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)
goto out;
iobuf1 = kmalloc(mtd->erasesize, GFP_KERNEL);
if (!iobuf1)
goto out;
err = scan_for_bad_eraseblocks();
if (err)
goto out;
/* Read all eraseblocks 1 page at a time */
pr_info("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)
pr_info("finished with errors\n");
else
pr_info("finished\n");
out:
kfree(iobuf);
kfree(iobuf1);
kfree(bbt);
put_mtd_device(mtd);
if (err)
pr_info("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");
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