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Commit fb3bff5b authored by KOBAYASHI Yoshitake's avatar KOBAYASHI Yoshitake Committed by Boris Brezillon
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mtd: nand: toshiba: Retrieve ECC requirements from extended ID 



This patch enables support to read the ECC strength and size from the
NAND flash using Toshiba Memory SLC NAND extended-ID. This patch is
based on the information of the 6th ID byte of the Toshiba Memory SLC
NAND.

Signed-off-by: default avatarKOBAYASHI Yoshitake <yoshitake.kobayashi@toshiba.co.jp>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@bootlin.com>
parent 1b8c9098

drivers/mtd/nand/nand_toshiba.c

+26 −0
Original line number Diff line number Diff line
@@ -35,6 +35,32 @@ static void toshiba_nand_decode_id(struct nand_chip *chip) 
	    (chip->id.data[5] & 0x7) == 0x6 /* 24nm */ &&

	    !(chip->id.data[4] & 0x80) /* !BENAND */)

		mtd->oobsize = 32 * mtd->writesize >> 9;



	/*

	 * Extract ECC requirements from 6th id byte.

	 * For Toshiba SLC, ecc requrements are as follows:

	 *  - 43nm: 1 bit ECC for each 512Byte is required.

	 *  - 32nm: 4 bit ECC for each 512Byte is required.

	 *  - 24nm: 8 bit ECC for each 512Byte is required.

	 */

	if (chip->id.len >= 6 && nand_is_slc(chip)) {

		chip->ecc_step_ds = 512;

		switch (chip->id.data[5] & 0x7) {

		case 0x4:

			chip->ecc_strength_ds = 1;

			break;

		case 0x5:

			chip->ecc_strength_ds = 4;

			break;

		case 0x6:

			chip->ecc_strength_ds = 8;

			break;

		default:

			WARN(1, "Could not get ECC info");

			chip->ecc_step_ds = 0;

			break;

		}

	}

}



static int toshiba_nand_init(struct nand_chip *chip)