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Commit 2dc0bdd9 authored by Huang Shijie's avatar Huang Shijie Committed by David Woodhouse
Browse files

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: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent e2985fc1

include/linux/mtd/nand.h

+15 −0
Original line number Diff line number Diff line
@@ -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;

};



/**