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Commit 1d0ed69d authored by Huang Shijie's avatar Huang Shijie Committed by Brian Norris
Browse files

mtd: nand: add a helper to check the SLC/MLC nand chip 



Add a helper to check if a nand chip is SLC or MLC.
This helper makes the code more readable.

Signed-off-by: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 4ae7d228

drivers/mtd/nand/denali.c

+1 −1
Original line number Diff line number Diff line
@@ -1520,7 +1520,7 @@ int denali_init(struct denali_nand_info *denali) 
	 * so just let controller do 15bit ECC for MLC and 8bit ECC for

	 * SLC if possible.

	 * */

	if (denali->nand.cellinfo & NAND_CI_CELLTYPE_MSK &&

	if (!nand_is_slc(&denali->nand) &&

			(denali->mtd.oobsize > (denali->bbtskipbytes +

			ECC_15BITS * (denali->mtd.writesize /

			ECC_SECTOR_SIZE)))) {

drivers/mtd/nand/nand_base.c

+6 −8
Original line number Diff line number Diff line
@@ -3108,8 +3108,7 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, 
	 * ID to decide what to do.

	 */

	if (id_len == 6 && id_data[0] == NAND_MFR_SAMSUNG &&

			(chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&

			id_data[5] != 0x00) {

			!nand_is_slc(chip) && id_data[5] != 0x00) {

		/* Calc pagesize */

		mtd->writesize = 2048 << (extid & 0x03);

		extid >>= 2;
@@ -3141,7 +3140,7 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, 
			(((extid >> 1) & 0x04) | (extid & 0x03));

		*busw = 0;

	} else if (id_len == 6 && id_data[0] == NAND_MFR_HYNIX &&

			(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {

			!nand_is_slc(chip)) {

		unsigned int tmp;



		/* Calc pagesize */
@@ -3204,7 +3203,7 @@ static void nand_decode_ext_id(struct mtd_info *mtd, struct nand_chip *chip, 
		 * - ID byte 5, bit[7]:    1 -> BENAND, 0 -> raw SLC

		 */

		if (id_len >= 6 && id_data[0] == NAND_MFR_TOSHIBA &&

				!(chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&

				nand_is_slc(chip) &&

				(id_data[5] & 0x7) == 0x6 /* 24nm */ &&

				!(id_data[4] & 0x80) /* !BENAND */) {

			mtd->oobsize = 32 * mtd->writesize >> 9;
@@ -3265,11 +3264,11 @@ static void nand_decode_bbm_options(struct mtd_info *mtd, 
	 * Micron devices with 2KiB pages and on SLC Samsung, Hynix, Toshiba,

	 * AMD/Spansion, and Macronix.  All others scan only the first page.

	 */

	if ((chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&

	if (!nand_is_slc(chip) &&

			(maf_id == NAND_MFR_SAMSUNG ||

			 maf_id == NAND_MFR_HYNIX))

		chip->bbt_options |= NAND_BBT_SCANLASTPAGE;

	else if ((!(chip->cellinfo & NAND_CI_CELLTYPE_MSK) &&

	else if ((nand_is_slc(chip) &&

				(maf_id == NAND_MFR_SAMSUNG ||

				 maf_id == NAND_MFR_HYNIX ||

				 maf_id == NAND_MFR_TOSHIBA ||
@@ -3745,8 +3744,7 @@ int nand_scan_tail(struct mtd_info *mtd) 
	chip->ecc.total = chip->ecc.steps * chip->ecc.bytes;



	/* Allow subpage writes up to ecc.steps. Not possible for MLC flash */

	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) &&

	    !(chip->cellinfo & NAND_CI_CELLTYPE_MSK)) {

	if (!(chip->options & NAND_NO_SUBPAGE_WRITE) && nand_is_slc(chip)) {

		switch (chip->ecc.steps) {

		case 2:

			mtd->subpage_sft = 1;

include/linux/mtd/nand.h

+9 −0
Original line number Diff line number Diff line
@@ -795,4 +795,13 @@ static inline int onfi_get_sync_timing_mode(struct nand_chip *chip) 
	return le16_to_cpu(chip->onfi_params.src_sync_timing_mode);

}



/*

 * Check if it is a SLC nand.

 * The !nand_is_slc() can be used to check the MLC/TLC nand chips.

 * We do not distinguish the MLC and TLC now.

 */

static inline bool nand_is_slc(struct nand_chip *chip)

{

	return !(chip->cellinfo & NAND_CI_CELLTYPE_MSK);

}

#endif /* __LINUX_MTD_NAND_H */