diff options
Diffstat (limited to 'drivers/mtd/tests/readtest.c')
| -rw-r--r-- | drivers/mtd/tests/readtest.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/mtd/tests/readtest.c b/drivers/mtd/tests/readtest.c new file mode 100644 index 000000000000..2cdd0c47cac1 --- /dev/null +++ b/drivers/mtd/tests/readtest.c @@ -0,0 +1,257 @@ +/* + * 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"); |