Revert "nand: make 1-bit software ECC configurable"

This reverts commit 4fee6c2f295f932b8febdc7ce8731ba045695fa5.

It breaks boards that currently rely on soft-ecc, as pointed out here:
http://patchwork.ozlabs.org/patch/140872/

The reverted patch should be resubmitted with documentation, and with the
CONFIG_MTD_ECC_SOFT selected from every board that needs it.  We could
start by looking at what NAND driver the board selects, and whether
that driver ever asks for soft ECC.

Signed-off-by: Scott Wood <scottwood@freescale.com>

drivers/mtd/nand/Makefile

@@ -39,7 +39,7 @@ COBJS-y += nand_bbt.o
 COBJS-y += nand_ids.o
 COBJS-y += nand_util.o
 endif
-COBJS-$(CONFIG_MTD_ECC_SOFT) += nand_ecc.o
+COBJS-y += nand_ecc.o
 COBJS-y += nand_base.o
 COBJS-$(CONFIG_NAND_ECC_BCH) += nand_bch.o
 

drivers/mtd/nand/nand_base.c

@@ -3028,10 +3028,6 @@ int nand_scan_tail(struct mtd_info *mtd)
 		chip->ecc.mode = NAND_ECC_SOFT;
 
 	case NAND_ECC_SOFT:
-		if (!mtd_nand_has_ecc_soft()) {
-			printk(KERN_WARNING "CONFIG_MTD_ECC_SOFT not enabled\n");
-			return -EINVAL;
-		}
 		chip->ecc.calculate = nand_calculate_ecc;
 		chip->ecc.correct = nand_correct_data;
 		chip->ecc.read_page = nand_read_page_swecc;

include/linux/mtd/nand_ecc.h

@@ -15,10 +15,6 @@
 
 struct mtd_info;
 
-#if defined(CONFIG_MTD_ECC_SOFT)
-
-static inline int mtd_nand_has_ecc_soft(void) { return 1; }
-
 /*
  * Calculate 3 byte ECC code for 256 byte block
  */
@@ -29,25 +25,4 @@ int nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code
  */
 int nand_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc, u_char *calc_ecc);
 
-#else
-
-static inline int mtd_nand_has_ecc_soft(void) { return 0; }
-
-static inline int
-nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u_char *ecc_code)
-{
-	return -1;
-}
-
-static inline int
-nand_correct_data(struct mtd_info *mtd,
-			u_char *dat,
-			u_char *read_ecc,
-			u_char *calc_ecc)
-{
-	return -1;
-}
-
-#endif
-
 #endif /* __MTD_NAND_ECC_H__ */