[PATCH 08/11] mtd: add a new field for ecc info in the nand_flash_dev{}

[Huang Shijie]

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 at freescale.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 2c5a2e0..2837bc6 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -633,6 +633,11 @@ 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
+ *            ECC_INFO(4, 512) macro.
  */
 struct nand_flash_dev {
 	char *name;
@@ -649,6 +654,11 @@ struct nand_flash_dev {
 	unsigned int options;
 	uint16_t id_len;
 	uint16_t oobsize;
+
+#define ECC_INFO(strength, size)	(((strength) << 16) | (size))
+#define ECC_STRENGTH(x)			(((x) >> 16) & 0xffff)
+#define ECC_SIZE(x)			((x) & 0xffff)
+	uint32_t ecc_info;
 };
 
 /**
-- 
1.7.1