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path: root/drivers/mtd/tests/mtd_subpagetest.c
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Diffstat (limited to 'drivers/mtd/tests/mtd_subpagetest.c')
-rw-r--r--drivers/mtd/tests/mtd_subpagetest.c525
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");
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