2 files changed, 121 insertions, 0 deletions
diff --git a/drivers/mtd/tests/mtd_test.c b/drivers/mtd/tests/mtd_test.c
new file mode 100644
index 000000000000..bda8c4de3433
--- /dev/null
+++ b/drivers/mtd/tests/mtd_test.c
@@ -0,0 +1,110 @@
+#define pr_fmt(fmt) "mtd_test: " fmt
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/printk.h>
+
+#include "mtd_test.h"
+
+int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned 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) {
+		pr_info("error %d while erasing EB %d\n", err, ebnum);
+		return err;
+	}
+
+	if (ei.state == MTD_ERASE_FAILED) {
+		pr_info("some erase error occurred at EB %d\n", ebnum);
+		return -EIO;
+	}
+	return 0;
+}
+
+static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)
+{
+	int ret;
+	loff_t addr = ebnum * mtd->erasesize;
+
+	ret = mtd_block_isbad(mtd, addr);
+	if (ret)
+		pr_info("block %d is bad\n", ebnum);
+
+	return ret;
+}
+
+int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
+					unsigned int eb, int ebcnt)
+{
+	int i, bad = 0;
+
+	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(mtd, eb + i) ? 1 : 0;
+		if (bbt[i])
+			bad += 1;
+		cond_resched();
+	}
+	pr_info("scanned %d eraseblocks, %d are bad\n", i, bad);
+
+	return 0;
+}
+
+int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
+				unsigned int eb, int ebcnt)
+{
+	int err;
+	unsigned int i;
+
+	for (i = 0; i < ebcnt; ++i) {
+		if (bbt[i])
+			continue;
+		err = mtdtest_erase_eraseblock(mtd, eb + i);
+		if (err)
+			return err;
+		cond_resched();
+	}
+
+	return 0;
+}
+
+int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf)
+{
+	size_t read;
+	int err;
+
+	err = mtd_read(mtd, addr, size, &read, buf);
+	/* Ignore corrected ECC errors */
+	if (mtd_is_bitflip(err))
+		err = 0;
+	if (!err && read != size)
+		err = -EIO;
+
+	return err;
+}
+
+int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,
+		const void *buf)
+{
+	size_t written;
+	int err;
+
+	err = mtd_write(mtd, addr, size, &written, buf);
+	if (!err && written != size)
+		err = -EIO;
+
+	return err;
+}
diff --git a/drivers/mtd/tests/mtd_test.h b/drivers/mtd/tests/mtd_test.h
new file mode 100644
index 000000000000..f437c776c54f
--- /dev/null
+++ b/drivers/mtd/tests/mtd_test.h
@@ -0,0 +1,11 @@
+#include <linux/mtd/mtd.h>
+
+int mtdtest_erase_eraseblock(struct mtd_info *mtd, unsigned int ebnum);
+int mtdtest_scan_for_bad_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
+					unsigned int eb, int ebcnt);
+int mtdtest_erase_good_eraseblocks(struct mtd_info *mtd, unsigned char *bbt,
+				unsigned int eb, int ebcnt);
+
+int mtdtest_read(struct mtd_info *mtd, loff_t addr, size_t size, void *buf);
+int mtdtest_write(struct mtd_info *mtd, loff_t addr, size_t size,
+		const void *buf);