linux-kernel - [PATCH] mtd: nand: davinci: add support for 4K page size nand devices.

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Date:	Wed, 10 Jun 2015 03:27:56 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	<dwmw2@...radead.org>, <computersforpeace@...il.com>,
	<wsa@...-dreams.de>, <linux-mtd@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC:	Murali Karicheri <m-karicheri2@...com>, Hao Zhang <hzhang@...com>
Subject: [PATCH] mtd: nand: davinci: add support for 4K page size nand devices.

K2L EVM uses NAND with 4K page size. This patch add support for
ECC layout requires to enable Micron MT29F16G08ADBCAH4 NAND available
on this EVM.

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
Signed-off-by: Hao Zhang <hzhang@...com>
---
 drivers/mtd/nand/davinci_nand.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/mtd/nand/davinci_nand.c b/drivers/mtd/nand/davinci_nand.c
index feb6d18..d6d92e3 100644
--- a/drivers/mtd/nand/davinci_nand.c
+++ b/drivers/mtd/nand/davinci_nand.c
@@ -520,6 +520,31 @@ static struct nand_ecclayout hwecc4_2048 = {
 	},
 };
 
+/* An ECC layout for using 4-bit ECC with large-page (4096bytes) flash,
+ * storing ten ECC bytes plus the manufacturer's bad block marker byte,
+ * and not overlapping the default BBT markers.
+ */
+static struct nand_ecclayout hwecc4_4096 = {
+	.eccbytes = 80,
+	.eccpos = {
+		/* at the end of spare sector */
+		48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
+		58, 59, 60, 61, 62, 63, 64, 65, 66, 67,
+		68, 69, 70, 71, 72, 73, 74, 75, 76, 77,
+		78, 79, 80, 81, 82, 83, 84, 85, 86, 87,
+		88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
+		98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
+		108, 109, 110, 111, 112, 113, 114, 115, 116, 117,
+		118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
+		},
+	.oobfree = {
+		/* 2 bytes at offset 0 hold manufacturer badblock markers */
+		{.offset = 2, .length = 46, },
+		/* 5 bytes at offset 8 hold BBT markers */
+		/* 8 bytes at offset 16 hold JFFS2 clean markers */
+	},
+};
+
 #if defined(CONFIG_OF)
 static const struct of_device_id davinci_nand_of_match[] = {
 	{.compatible = "ti,davinci-nand", },
@@ -796,6 +821,11 @@ static int nand_davinci_probe(struct platform_device *pdev)
 			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
 			goto syndrome_done;
 		}
+		if (chunks == 8) {
+			info->ecclayout = hwecc4_4096;
+			info->chip.ecc.mode = NAND_ECC_HW_OOB_FIRST;
+			goto syndrome_done;
+		}
 
 		/* 4KiB page chips are not yet supported. The eccpos from
 		 * nand_ecclayout cannot hold 80 bytes and change to eccpos[]
-- 
1.9.1

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