linux-kernel - [PATCH v2 5/8] mtd: add a new field for ecc info in the nand_flash

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Date:	Mon, 22 Apr 2013 15:47:55 +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 v2 5/8] mtd: add a new field for ecc info in the nand_flash_dev{}

Add the @ecc_info in the nand_flash_dev{}.
The lower 16 bits are used to store the ECC bits, while the upper 16 bits
are used to store the ECC data chunk size.

Signed-off-by: Huang Shijie <b32955@...escale.com>
---
 include/linux/mtd/nand.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 122322c..8238e00 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -623,6 +623,10 @@ struct nand_chip {
 	{ .name = (nm), {{ .dev_id = (devid) }}, .chipsize = (chipsz), \
 	  .options = (opts) }
 
+#define NAND_ECC_INFO(strength, size)	(((strength) << 16) | (size))
+#define NAND_ECC_STRENGTH(x)		(((x) >> 16) & 0xffff)
+#define NAND_ECC_SIZE(x)		((x) & 0xffff)
+
 /**
  * struct nand_flash_dev - NAND Flash Device ID Structure
  * @name: a human-readable name of the NAND chip
@@ -640,6 +644,11 @@ struct nand_chip {
  * @options: stores various chip bit options
  * @id_len: The valid length of the @id.
  * @oobsize: OOB size
+ * @ecc_info: The ECC information.
+ *            lower 16 bits: store the ECC bits.
+ *            upper 16 bits: store the ECC data chunk size.
+ *            For example, the "4bit ECC for each 512Byte" can be set with
+ *            NAND_ECC_INFO(4, 512) macro.
  */
 struct nand_flash_dev {
 	char *name;
@@ -656,6 +665,7 @@ struct nand_flash_dev {
 	unsigned int options;
 	uint16_t id_len;
 	uint16_t oobsize;
+	uint32_t ecc_info;
 };
 
 /**
-- 
1.7.1


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