From 1df308e5be76ec42ade8fb21f623f36ba09217bd Mon Sep 17 00:00:00 2001
From: Ilya Yanok <yanok@emcraft.com>
Date: Mon, 28 Nov 2011 06:37:37 +0000
Subject: nand_spl_simple: add support for software ECC

This patch adds support for software ECC to the nand_spl_simple driver.
To enable this one have to define CONFIG_SPL_NAND_SOFTECC.

Tested on OMAP3.

Signed-off-by: Ilya Yanok <yanok@emcraft.com>
Acked-by: Scott Wood <scottwood@freescale.com>

diff --git a/drivers/mtd/nand/nand_ecc.c b/drivers/mtd/nand/nand_ecc.c
index 52bc916..81f0e08 100644
--- a/drivers/mtd/nand/nand_ecc.c
+++ b/drivers/mtd/nand/nand_ecc.c
@@ -50,7 +50,7 @@
  * only nand_correct_data() is needed
  */
 
-#ifndef CONFIG_NAND_SPL
+#if !defined(CONFIG_NAND_SPL) || defined(CONFIG_SPL_NAND_SOFTECC)
 /*
  * Pre-calculated 256-way 1 byte column parity
  */
diff --git a/drivers/mtd/nand/nand_spl_simple.c b/drivers/mtd/nand/nand_spl_simple.c
index e5003e6..ed821f2 100644
--- a/drivers/mtd/nand/nand_spl_simple.c
+++ b/drivers/mtd/nand/nand_spl_simple.c
@@ -21,6 +21,7 @@
 #include <common.h>
 #include <nand.h>
 #include <asm/io.h>
+#include <linux/mtd/nand_ecc.h>
 
 static int nand_ecc_pos[] = CONFIG_SYS_NAND_ECCPOS;
 static nand_info_t mtd;
@@ -204,7 +205,8 @@ static int nand_read_page(int block, int page, void *dst)
 	oob_data = ecc_calc + 0x200;
 
 	for (i = 0; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
-		this->ecc.hwctl(&mtd, NAND_ECC_READ);
+		if (this->ecc.mode != NAND_ECC_SOFT)
+			this->ecc.hwctl(&mtd, NAND_ECC_READ);
 		this->read_buf(&mtd, p, eccsize);
 		this->ecc.calculate(&mtd, p, &ecc_calc[i]);
 	}
@@ -274,6 +276,13 @@ void nand_init(void)
 		(void  __iomem *)CONFIG_SYS_NAND_BASE;
 	board_nand_init(&nand_chip);
 
+#ifdef CONFIG_SPL_NAND_SOFTECC
+	if (nand_chip.ecc.mode == NAND_ECC_SOFT) {
+		nand_chip.ecc.calculate = nand_calculate_ecc;
+		nand_chip.ecc.correct = nand_correct_data;
+	}
+#endif
+
 	if (nand_chip.select_chip)
 		nand_chip.select_chip(&mtd, 0);
 }
-- 
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