[v4,3/4] omap: nand: ecc layout select from board file

Commit Message

Sukumar Ghorai Aug. 2, 2010, 3:49 p.m. UTC

None

Patch

diff --git a/arch/arm/mach-omap2/board-flash.c b/arch/arm/mach-omap2/board-flash.c
index 4871d71..5f74c8f 100644
--- a/arch/arm/mach-omap2/board-flash.c
+++ b/arch/arm/mach-omap2/board-flash.c
@@ -144,7 +144,8 @@  __init board_nand_init(struct mtd_partition *nand_parts, u8 nr_parts, u8 cs)
 {
 	board_nand_data.cs		= cs;
 	board_nand_data.parts		= nand_parts;
-	board_nand_data.nr_parts		= nr_parts;
+	board_nand_data.nr_parts	= nr_parts;
+	board_nand_data.ecc_opt		= OMAP_ECC_HAMMING_CODE_DIFF_LAYOUT;
 
 	gpmc_nand_init(&board_nand_data);
 }
diff --git a/arch/arm/plat-omap/include/plat/nand.h b/arch/arm/plat-omap/include/plat/nand.h
index 5e69463..2e026e4 100644
--- a/arch/arm/plat-omap/include/plat/nand.h
+++ b/arch/arm/plat-omap/include/plat/nand.h
@@ -23,6 +23,12 @@  struct omap_nand_platform_data {
 	int			gpmc_irq;
 	unsigned long		phys_base;
 	int			devsize;
+	enum {
+		OMAP_ECC_HAMMING_CODE_DIFF_LAYOUT = 0,
+		/* 1-bit s/w ecc and layout different from romcode */
+		OMAP_ECC_HAMMING_CODE_HW,/* 1-bit ecc, romcode layout */
+		OMAP_ECC_HAMMING_CODE_SW,/* 1-bit ecc, romcode layout */
+	} ecc_opt;
 };
 
 /* minimum size for IO mapping */
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 20e73bf..63682c0 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -7,7 +7,6 @@ 
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-#define CONFIG_MTD_NAND_OMAP_HWECC
 
 #include <linux/platform_device.h>
 #include <linux/dma-mapping.h>
@@ -658,8 +657,6 @@  static int omap_verify_buf(struct mtd_info *mtd, const u_char * buf, int len)
 	return 0;
 }
 
-#ifdef CONFIG_MTD_NAND_OMAP_HWECC
-
 /**
  * gen_true_ecc - This function will generate true ECC value
  * @ecc_buf: buffer to store ecc code
@@ -879,8 +876,6 @@  static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
 	gpmc_enable_hwecc(info->gpmc_cs, mode, dev_width, info->nand.ecc.size);
 }
 
-#endif
-
 /**
  * omap_wait - wait until the command is done
  * @mtd: MTD device structure
@@ -1059,17 +1054,19 @@  static int __devinit omap_nand_probe(struct platform_device *pdev)
 	}
 	info->nand.verify_buf = omap_verify_buf;
 
-#ifdef CONFIG_MTD_NAND_OMAP_HWECC
-	info->nand.ecc.bytes		= 3;
-	info->nand.ecc.size		= 512;
-	info->nand.ecc.calculate	= omap_calculate_ecc;
-	info->nand.ecc.hwctl		= omap_enable_hwecc;
-	info->nand.ecc.correct		= omap_correct_data;
-	info->nand.ecc.mode		= NAND_ECC_HW;
-
-#else
-	info->nand.ecc.mode = NAND_ECC_SOFT;
-#endif
+	/* selsect the ecc type */
+	if ((pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_DIFF_LAYOUT) ||
+		(pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_HW)) {
+		info->nand.ecc.bytes		= 3;
+		info->nand.ecc.size		= 512;
+		info->nand.ecc.calculate	= omap_calculate_ecc;
+		info->nand.ecc.hwctl		= omap_enable_hwecc;
+		info->nand.ecc.correct		= omap_correct_data;
+		info->nand.ecc.mode		= NAND_ECC_HW;
+
+	} else if (pdata->ecc_opt == OMAP_ECC_HAMMING_CODE_SW) {
+		info->nand.ecc.mode = NAND_ECC_SOFT;
+	}
 
 	/* DIP switches on some boards change between 8 and 16 bit
 	 * bus widths for flash.  Try the other width if the first try fails.