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mtd: add ECC info for nand_flash_dev{} 

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

These two fields are all from the datasheet.

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

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Huang Shijie 2013-05-17 11:17:31 +08:00 committed by David Woodhouse
parent e2985fc1d6
commit 2dc0bdd91b
1 changed files with 15 additions and 0 deletions
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15
include/linux/mtd/nand.h
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@ -628,6 +628,11 @@ struct nand_chip {
{ .name = (nm), {{ .dev_id = (devid) }}, .chipsize = (chipsz), \
.options = (opts) }
#define NAND_ECC_INFO(_strength, _step) \
{ .strength_ds = (_strength), .step_ds = (_step) }
#define NAND_ECC_STRENGTH(type) ((type)->ecc.strength_ds)
#define NAND_ECC_STEP(type) ((type)->ecc.step_ds)
/**
* struct nand_flash_dev - NAND Flash Device ID Structure
* @name: a human-readable name of the NAND chip
@ -645,6 +650,12 @@ struct nand_chip {
* @options: stores various chip bit options
* @id_len: The valid length of the @id.
* @oobsize: OOB size
* @ecc.strength_ds: The ECC correctability from the datasheet, same as the
* @ecc_strength_ds in nand_chip{}.
* @ecc.step_ds: The ECC step required by the @ecc.strength_ds, same as the
* @ecc_step_ds 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;
@ -661,6 +672,10 @@ struct nand_flash_dev {
unsigned int options;
uint16_t id_len;
uint16_t oobsize;
struct {
uint16_t strength_ds;
uint16_t step_ds;
} ecc;
};
/**