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-rw-r--r--drivers/mtd/mtdcore.c49
-rw-r--r--include/linux/mtd/mtd.h4
2 files changed, 52 insertions, 1 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 6eb52ed..78f2a08 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -142,3 +142,52 @@ void put_mtd_device(struct mtd_info *mtd)
c = --mtd->usecount;
BUG_ON(c < 0);
}
+
+#if defined(CONFIG_CMD_MTDPARTS_SPREAD)
+/**
+ * mtd_get_len_incl_bad
+ *
+ * Check if length including bad blocks fits into device.
+ *
+ * @param mtd an MTD device
+ * @param offset offset in flash
+ * @param length image length
+ * @return image length including bad blocks in *len_incl_bad and whether or not
+ * the length returned was truncated in *truncated
+ */
+void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
+ const uint64_t length, uint64_t *len_incl_bad,
+ int *truncated)
+{
+ *truncated = 0;
+ *len_incl_bad = 0;
+
+ if (offset >= mtd->size) {
+ *truncated = 1;
+ return;
+ }
+
+ if (!mtd->block_isbad) {
+ *len_incl_bad = length;
+ return;
+ }
+
+ uint64_t len_excl_bad = 0;
+ uint64_t block_len;
+
+ while (len_excl_bad < length) {
+ block_len = mtd->erasesize - (offset & (mtd->erasesize - 1));
+
+ if (!mtd->block_isbad(mtd, offset & ~(mtd->erasesize - 1)))
+ len_excl_bad += block_len;
+
+ *len_incl_bad += block_len;
+ offset += block_len;
+
+ if (offset >= mtd->size) {
+ *truncated = 1;
+ break;
+ }
+ }
+}
+#endif /* defined(CONFIG_CMD_MTDPARTS_SPREAD) */
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index f1cdf23..3b18d7d 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -255,7 +255,9 @@ extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
extern struct mtd_info *get_mtd_device_nm(const char *name);
extern void put_mtd_device(struct mtd_info *mtd);
-
+extern void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
+ const uint64_t length, uint64_t *len_incl_bad,
+ int *truncated);
/* XXX U-BOOT XXX */
#if 0
struct mtd_notifier {