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-rw-r--r--drivers/mtd/ftl.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/mtd/ftl.c b/drivers/mtd/ftl.c
index f34f20c78911..9bf581c4f740 100644
--- a/drivers/mtd/ftl.c
+++ b/drivers/mtd/ftl.c
@@ -1005,6 +1005,29 @@ static int ftl_writesect(struct mtd_blktrans_dev *dev,
return ftl_write((void *)dev, buf, block, 1);
}
+static int ftl_discardsect(struct mtd_blktrans_dev *dev,
+ unsigned long sector, unsigned nr_sects)
+{
+ partition_t *part = (void *)dev;
+ uint32_t bsize = 1 << part->header.EraseUnitSize;
+
+ DEBUG(1, "FTL erase sector %ld for %d sectors\n",
+ sector, nr_sects);
+
+ while (nr_sects) {
+ uint32_t old_addr = part->VirtualBlockMap[sector];
+ if (old_addr != 0xffffffff) {
+ part->VirtualBlockMap[sector] = 0xffffffff;
+ part->EUNInfo[old_addr/bsize].Deleted++;
+ if (set_bam_entry(part, old_addr, 0))
+ return -EIO;
+ }
+ nr_sects--;
+ sector++;
+ }
+
+ return 0;
+}
/*====================================================================*/
static void ftl_freepart(partition_t *part)
@@ -1069,6 +1092,7 @@ static struct mtd_blktrans_ops ftl_tr = {
.blksize = SECTOR_SIZE,
.readsect = ftl_readsect,
.writesect = ftl_writesect,
+ .discard = ftl_discardsect,
.getgeo = ftl_getgeo,
.add_mtd = ftl_add_mtd,
.remove_dev = ftl_remove_dev,