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 dbb95d9..2e5f139 100644
--- a/drivers/mtd/nand/lpc32xx_nand_slc.c
+++ b/drivers/mtd/nand/lpc32xx_nand_slc.c
@@ -75,6 +75,19 @@
#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 @@
#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