linux-kernel - [PATCH v5 08/11] mtd: add ECC info for nand_flash

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Message-ID: <1368607232-2210-9-git-send-email-b32955@freescale.com>
Date:	Wed, 15 May 2013 16:40:31 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	<dwmw2@...radead.org>
CC:	<dedekind1@...il.com>, <computersforpeace@...il.com>,
	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	Huang Shijie <b32955@...escale.com>
Subject: [PATCH v5 08/11] mtd: add ECC info for nand_flash_dev{}

Add an instance of an anonymous struct to store the ECC infor for full id
nand chips.
	@ecc.strength: ECC correctability from the datasheet.
	@ecc.step: ECC size required by the @ecc.strength,

Also add the necessary macros to make the code simple and clean.

Signed-off-by: Huang Shijie <b32955@...escale.com>
---
 include/linux/mtd/nand.h |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index c503850..718d2c5 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -625,6 +625,11 @@ struct nand_chip {
 	{ .name = (nm), {{ .dev_id = (devid) }}, .chipsize = (chipsz), \
 	  .options = (opts) }
 
+#define NAND_ECC_INFO(_strength, _step)	\
+			{ .strength = (_strength), .step = (_step) }
+#define NAND_ECC_STRENGTH(type)		((type)->ecc.strength)
+#define NAND_ECC_STEP(type)		((type)->ecc.step)
+
 /**
  * struct nand_flash_dev - NAND Flash Device ID Structure
  * @name: a human-readable name of the NAND chip
@@ -642,6 +647,12 @@ struct nand_chip {
  * @options: stores various chip bit options
  * @id_len: The valid length of the @id.
  * @oobsize: OOB size
+ * @ecc.strength: The ECC correctability from the datasheet, same as the
+ *                @ecc_strength in nand_chip{}.
+ * @ecc.step: The ECC step required by the @ecc.strength, same as the
+ *            @ecc_size in nand_chip{}, also from the datasheet.
+ *            For example, the "4bit ECC for each 512Byte" can be set with
+ *            NAND_ECC_INFO(4, 512).
  */
 struct nand_flash_dev {
 	char *name;
@@ -658,6 +669,10 @@ struct nand_flash_dev {
 	unsigned int options;
 	uint16_t id_len;
 	uint16_t oobsize;
+	struct {
+		uint16_t strength;
+		uint16_t step;
+	} ecc;
 };
 
 /**
-- 
1.7.1


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