[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>

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;

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;
 }
 
 /**