[U-Boot] [U-boot] [Patch v3 1/3] mtd: nand: davinci: allow to change ecclayout by ecclayout command

[Ivan Khoronzhuk]

From: WingMan Kwok <w-kwok2 at ti.com>

This patch adds opportunity to change ecclayout of current nand
device during runtime. So we can change the current nand device
ecclayout using the "nand ecclayout set" command before writing
the data to nand flash.

Signed-off-by: Hao Zhang <hzhang at ti.com>
Signed-off-by: WingMan Kwok <w-kwok2 at ti.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk at ti.com>
---
 arch/arm/include/asm/ti-common/davinci_nand.h |  4 ++
 drivers/mtd/nand/davinci_nand.c               | 94 +++++++++++++++++++++++++++
 2 files changed, 98 insertions(+)

diff --git a/arch/arm/include/asm/ti-common/davinci_nand.h b/arch/arm/include/asm/ti-common/davinci_nand.h
index 11407be..bb3ed94 100644
--- a/arch/arm/include/asm/ti-common/davinci_nand.h
+++ b/arch/arm/include/asm/ti-common/davinci_nand.h
@@ -93,6 +93,10 @@ struct davinci_emif_regs {
 #define DAVINCI_ABCR_ASIZE_16BIT			1
 #define DAVINCI_ABCR_ASIZE_8BIT				0
 
+/* Layouts */
+#define NAND_DAVINCI_4BIT_LAYOUT			0
+#define NAND_KEYSTONE_RBL_4BIT_LAYOUT			1
+
 void davinci_nand_init(struct nand_chip *nand);
 
 #endif
diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index 5d42509..7a84047 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -305,6 +305,100 @@ static struct nand_ecclayout nand_davinci_4bit_layout_oobfirst = {
 #endif
 };
 
+#if defined(CONFIG_CMD_NAND_ECCLAYOUT)
+#if defined(CONFIG_SYS_NAND_PAGE_2K)
+static struct nand_ecclayout nand_keystone_rbl_4bit_layout_oobfirst = {
+	.eccbytes = 40,
+	.eccpos = {
+		6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+	},
+	.oobfree = {
+		{.offset = 2, .length = 4, },
+		{.offset = 16, .length = 6, },
+		{.offset = 32, .length = 6, },
+		{.offset = 48, .length = 6, },
+	},
+};
+#elif defined(CONFIG_SYS_NAND_PAGE_4K)
+static struct nand_ecclayout nand_keystone_rbl_4bit_layout_oobfirst = {
+	.eccbytes = 80,
+	.eccpos = {
+		6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+		22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+		38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
+		54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+		70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
+		86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
+		102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
+		118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
+	},
+	.oobfree = {
+		{.offset = 2, .length = 4, },
+		{.offset = 16, .length = 6, },
+		{.offset = 32, .length = 6, },
+		{.offset = 48, .length = 6, },
+		{.offset = 64, .length = 6, },
+		{.offset = 80, .length = 6, },
+		{.offset = 96, .length = 6, },
+		{.offset = 112, .length = 6, },
+	},
+};
+#endif
+
+struct nand_ecclayout *davinci_nand_ecclayouts[] = {
+	&nand_davinci_4bit_layout_oobfirst,
+	&nand_keystone_rbl_4bit_layout_oobfirst,
+};
+
+int board_nand_get_ecclayout_idx(struct nand_chip *nand,
+				 struct nand_ecclayout *layout)
+{
+	int i;
+
+	if (!layout)
+		return -1;
+
+	for (i = 0; i < ARRAY_SIZE(davinci_nand_ecclayouts); i++)
+		if (davinci_nand_ecclayouts[i] == layout)
+			return i;
+
+	return -1;
+}
+
+struct nand_ecclayout *board_nand_get_ecclayout(int idx)
+{
+	if ((idx >= 0) && (idx < ARRAY_SIZE(davinci_nand_ecclayouts)))
+		return davinci_nand_ecclayouts[idx];
+	else
+		return NULL;
+}
+
+int board_nand_set_ecclayout(struct mtd_info *mtd, int idx)
+{
+	int i;
+	struct nand_ecclayout *layout;
+	struct nand_chip *nand = mtd->priv;
+
+	if (idx < 0 || idx >= ARRAY_SIZE(davinci_nand_ecclayouts))
+		return -1;
+
+	layout = davinci_nand_ecclayouts[idx];
+
+	layout->oobavail = 0;
+	for (i = 0; layout->oobfree[i].length &&
+	     i < ARRAY_SIZE(layout->oobfree); i++)
+		layout->oobavail += layout->oobfree[i].length;
+
+	mtd->oobavail = layout->oobavail;
+	nand->ecc.layout = layout;
+
+	return 0;
+}
+#endif /* CONFIG_CMD_NAND_ECCLAYOUT */
+
 static void nand_davinci_4bit_enable_hwecc(struct mtd_info *mtd, int mode)
 {
 	u32 val;
-- 
1.8.3.2