FIXME: Why does this use raw accesses? The test for 16 bitflips
is arbitrary, do this properly. Only a single page of a whole
block is tested, this has at least to be documented.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/mtd/peb.c | 32 ++++++++++++++++++++++++++++++++
include/mtd/mtd-peb.h | 1 +
2 files changed, 33 insertions(+)
diff --git a/drivers/mtd/peb.c b/drivers/mtd/peb.c
index 388db7f587..d9da4797b0 100644
--- a/drivers/mtd/peb.c
+++ b/drivers/mtd/peb.c
@@ -15,6 +15,7 @@
#include <init.h>
#include <magicvar.h>
#include <globalvar.h>
+#include <linux/mtd/nand.h>
#include <linux/mtd/mtd.h>
#include <mtd/mtd-peb.h>
#include <linux/err.h>
@@ -562,6 +563,37 @@ out:
return err;
}
+int mtd_peb_is_empty(struct mtd_info *mtd, int block)
+{
+ struct mtd_oob_ops ops;
+ int rawsize = mtd->writesize + mtd->oobsize;
+ void *rawpage = xmalloc(rawsize);
+ int ret;
+ loff_t offset = (loff_t)block * mtd->erasesize;
+
+ ops.mode = MTD_OPS_RAW;
+ ops.ooboffs = 0;
+ ops.datbuf = rawpage;
+ ops.len = mtd->writesize;
+ ops.oobbuf = rawpage + mtd->writesize;
+ ops.ooblen = mtd->oobsize;
+
+ ret = mtd_read_oob(mtd, offset, &ops);
+ if (ret)
+ goto err;
+
+ ret = nand_check_erased_buf(rawpage, rawsize, 16);
+
+ if (ret == -EBADMSG)
+ ret = 0;
+ else if (ret >= 0)
+ ret = 1;
+
+err:
+ free(rawpage);
+ return ret;
+}
+
/**
* mtd_peb_create_bitflips - create bitflips on Nand pages
* @mtd: mtd device
diff --git a/include/mtd/mtd-peb.h b/include/mtd/mtd-peb.h
index 23f89d89a8..6d862499aa 100644
--- a/include/mtd/mtd-peb.h
+++ b/include/mtd/mtd-peb.h
@@ -18,6 +18,7 @@ int mtd_peb_check_all_ff(struct mtd_info *mtd, int pnum, int offset, int len,
int mtd_peb_verify(struct mtd_info *mtd, const void *buf, int pnum,
int offset, int len);
int mtd_num_pebs(struct mtd_info *mtd);
+int mtd_peb_is_empty(struct mtd_info *mtd, int block);
int mtd_peb_create_bitflips(struct mtd_info *mtd, int pnum, int offset,
int len, int num_bitflips, int random,
int info);
--
2.20.1
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