[MTD] [NAND] Blackfin NFC Driver: add support for the ECC layout the Blackfin bootrom uses

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index fc58afe..3555f6b 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -91,6 +91,41 @@ static const unsigned short bfin_nfc_pin_req[] =
 	 P_NAND_ALE,
 	 0};
 
+#ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
+static uint8_t bbt_pattern[] = { 0xff };
+
+static struct nand_bbt_descr bootrom_bbt = {
+	.options = 0,
+	.offs = 63,
+	.len = 1,
+	.pattern = bbt_pattern,
+};
+
+static struct nand_ecclayout bootrom_ecclayout = {
+	.eccbytes = 24,
+	.eccpos = {
+		0x8 * 0, 0x8 * 0 + 1, 0x8 * 0 + 2,
+		0x8 * 1, 0x8 * 1 + 1, 0x8 * 1 + 2,
+		0x8 * 2, 0x8 * 2 + 1, 0x8 * 2 + 2,
+		0x8 * 3, 0x8 * 3 + 1, 0x8 * 3 + 2,
+		0x8 * 4, 0x8 * 4 + 1, 0x8 * 4 + 2,
+		0x8 * 5, 0x8 * 5 + 1, 0x8 * 5 + 2,
+		0x8 * 6, 0x8 * 6 + 1, 0x8 * 6 + 2,
+		0x8 * 7, 0x8 * 7 + 1, 0x8 * 7 + 2
+	},
+	.oobfree = {
+		{ 0x8 * 0 + 3, 5 },
+		{ 0x8 * 1 + 3, 5 },
+		{ 0x8 * 2 + 3, 5 },
+		{ 0x8 * 3 + 3, 5 },
+		{ 0x8 * 4 + 3, 5 },
+		{ 0x8 * 5 + 3, 5 },
+		{ 0x8 * 6 + 3, 5 },
+		{ 0x8 * 7 + 3, 5 },
+	}
+};
+#endif
+
 /*
  * Data structures for bf5xx nand flash controller driver
  */
@@ -712,6 +747,11 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
 
 	/* setup hardware ECC data struct */
 	if (hardware_ecc) {
+#ifdef CONFIG_MTD_NAND_BF5XX_BOOTROM_ECC
+		chip->badblock_pattern = &bootrom_bbt;
+		chip->ecc.layout = &bootrom_ecclayout;
+#endif
+
 		if (plat->page_size == NFC_PG_SIZE_256) {
 			chip->ecc.bytes = 3;
 			chip->ecc.size = 256;