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-rw-r--r--drivers/mtd/tests/mtd_test.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/mtd/tests/mtd_test.c b/drivers/mtd/tests/mtd_test.c
new file mode 100644
index 000000000..c84250bef
--- /dev/null
+++ b/drivers/mtd/tests/mtd_test.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+#define pr_fmt(fmt) "mtd_test: " fmt
+
+#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 = (loff_t)ebnum * mtd->erasesize;
+
+ memset(&ei, 0, sizeof(struct erase_info));
+ 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;
+ }
+
+ return 0;
+}
+
+static int is_block_bad(struct mtd_info *mtd, unsigned int ebnum)
+{
+ int ret;
+ loff_t addr = (loff_t)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;
+ if (err)
+ pr_err("error: read failed at %#llx\n", addr);
+
+ 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;
+ if (err)
+ pr_err("error: write failed at %#llx\n", addr);
+
+ return err;
+}