nand: lpc32xx: add ECC layout for small page NAND

Incorporate ECC layout for small page NAND from legacy LPCLinux NXP BSP.
The code taken from the legacy patch is:
- lpc32xx SLC NAND driver (ECC layout for small page)

This layout is matching the lpc32xx NAND SLC Linux Kernel driver.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>

diff --git a/drivers/mtd/nand/lpc32xx_nand_slc.c b/drivers/mtd/nand/lpc32xx_nand_slc.c
index dbb95d9326fe7302a0c02aacfc40df3d0433c295..2e5f1396061008282407159724c5ffa748f8a312 100644 (file)
--- a/drivers/mtd/nand/lpc32xx_nand_slc.c
+++ b/drivers/mtd/nand/lpc32xx_nand_slc.c
@@ -75,6 +75,19 @@ struct lpc32xx_nand_slc_regs {
 #define TAC_R_HOLD(n)          (max_t(uint32_t, (n), 0xF) << 4)
 #define TAC_R_SETUP(n)         (max_t(uint32_t, (n), 0xF) << 0)
 
+/* NAND ECC Layout for small page NAND devices
+ * Note: For large page devices, the default layouts are used. */
+static struct nand_ecclayout lpc32xx_nand_oob_16 = {
+       .eccbytes = 6,
+       .eccpos = {10, 11, 12, 13, 14, 15},
+       .oobfree = {
+               {.offset = 0,
+                . length = 4},
+               {.offset = 6,
+                . length = 4}
+               }
+};
+
 #if defined(CONFIG_DMA_LPC32XX)
 #define ECCSTEPS       (CONFIG_SYS_NAND_PAGE_SIZE / CONFIG_SYS_NAND_ECCSIZE)
 
@@ -563,13 +576,16 @@ int board_nand_init(struct nand_chip *lpc32xx_chip)
 #endif
 
        /*
-        * Use default ECC layout, but these values are predefined
+        * These values are predefined
         * for both small and large page NAND flash devices.
         */
        lpc32xx_chip->ecc.size     = CONFIG_SYS_NAND_ECCSIZE;
        lpc32xx_chip->ecc.bytes    = CONFIG_SYS_NAND_ECCBYTES;
        lpc32xx_chip->ecc.strength = 1;
 
+       if (CONFIG_SYS_NAND_PAGE_SIZE != NAND_LARGE_BLOCK_PAGE_SIZE)
+               lpc32xx_chip->ecc.layout = &lpc32xx_nand_oob_16;
+
 #if defined(CONFIG_SYS_NAND_USE_FLASH_BBT)
        lpc32xx_chip->bbt_options |= NAND_BBT_USE_FLASH;
 #endif