mtd: nand: kirkwood: add RS-ECC encoding support

[karo-tx-uboot.git] / drivers / mtd / nand / kirkwood_nand.c

diff --git a/drivers/mtd/nand/kirkwood_nand.c b/drivers/mtd/nand/kirkwood_nand.c
index bdab5aa795befc221e6c62d11c2b4a961d7ab499..1cdf286f6076f934871c823cbe1f58c53c761279 100644 (file)
--- a/drivers/mtd/nand/kirkwood_nand.c
+++ b/drivers/mtd/nand/kirkwood_nand.c
@@ -26,6 +26,11 @@
 #include <asm/io.h>
 #include <asm/arch/kirkwood.h>
 #include <nand.h>
+#include <linux/mtd/nand_ecc.h>
+
+#ifndef CONFIG_NAND_ECC_ALGO
+#define CONFIG_NAND_ECC_ALGO   NAND_ECC_SOFT
+#endif
 
 /* NAND Flash Soc registers */
 struct kwnandf_registers {
@@ -71,10 +76,32 @@ void kw_nand_select_chip(struct mtd_info *mtd, int chip)
        writel(data, &nf_reg->ctrl);
 }
 
+#ifdef CONFIG_NAND_ECC_SOFT_RS
+static struct nand_ecclayout kw_nand_oob_rs = {
+       .eccbytes = 40,
+       .eccpos = {
+               24, 25, 26, 27, 28, 29, 30, 31, 32, 33,
+               34, 35, 36, 37, 38, 39, 40, 41, 42, 43,
+               44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
+               54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+       },
+       .oobfree = {
+               { .offset = 2, .length = 22, },
+       },
+};
+#endif
+
 int board_nand_init(struct nand_chip *nand)
 {
        nand->options = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING;
+#ifndef CONFIG_NAND_ECC_SOFT_RS
        nand->ecc.mode = NAND_ECC_SOFT;
+#else
+       nand->ecc.mode = NAND_ECC_SOFT_RS;
+       nand->ecc.layout = &kw_nand_oob_rs;
+       nand->ecc.size = 512;
+       nand->ecc.bytes = 10;
+#endif
        nand->cmd_ctrl = kw_nand_hwcontrol;
        nand->chip_delay = 40;
        nand->select_chip = kw_nand_select_chip;