[MTD] [NAND] S3C2410: Allow the machine code to get the BBT table from NAND

Added a flag to allow the machine code to tell the NAND
subsystem that it should try to pickup a BBT from the flash,
and also skip the NAND full scan at startup.

Signed-off-by: Michel Pollet <buserror@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

2 files changed, 11 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c/include/plat/nand.h b/arch/arm/plat-s3c/include/plat/nand.h
index 935651664969..18f958801e64 100644
--- a/arch/arm/plat-s3c/include/plat/nand.h
+++ b/arch/arm/plat-s3c/include/plat/nand.h
@@ -13,6 +13,10 @@
 /**
  * struct s3c2410_nand_set - define a set of one or more nand chips
  * @disable_ecc:        Entirely disable ECC - Dangerous
+ * @flash_bbt:          Openmoko u-boot can create a Bad Block Table
+ *                      Setting this flag will allow the kernel to
+ *                      look for it at boot time and also skip the NAND
+ *                      scan.
  * @nr_chips:           Number of chips in this set
  * @nr_partitions:      Number of partitions pointed to by @partitions
  * @name:               Name of set (optional)
@@ -25,6 +29,7 @@
  */
 struct s3c2410_nand_set {
         unsigned int            disable_ecc:1;
+        unsigned int            flash_bbt:1;
 
         int                     nr_chips;
         int                     nr_partitions;
diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
index ef5665258968..d315b513db5c 100644
--- a/drivers/mtd/nand/s3c2410.c
+++ b/drivers/mtd/nand/s3c2410.c
@@ -845,6 +845,12 @@ static void s3c2410_nand_init_chip(struct s3c2410_nand_info *info,
                 dev_info(info->device, "NAND ECC UNKNOWN\n");
                 break;
         }
+
+        /* If you use u-boot BBT creation code, specifying this flag will
+         * let the kernel fish out the BBT from the NAND, and also skip the
+         * full NAND scan that can take 1/2s or so. Little things... */
+        if (set->flash_bbt)
+                chip->options |= NAND_USE_FLASH_BBT | NAND_SKIP_BBTSCAN;
 }
 
 /**