mtd: rawnand: Define the "distance 3" MLC pairing scheme (18729b17) · Commits · 戴 / test

drivers/mtd/nand/raw/internals.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -75,6 +75,9 @@ extern const struct nand_manufacturer_ops micron_nand_manuf_ops;
		extern const struct nand_manufacturer_ops samsung_nand_manuf_ops;
		extern const struct nand_manufacturer_ops toshiba_nand_manuf_ops;

		/* MLC pairing schemes */
		extern const struct mtd_pairing_scheme dist3_pairing_scheme;

		/* Core functions */
		const struct nand_manufacturer *nand_get_manufacturer(u8 id);
		int nand_bbm_get_next_page(struct nand_chip *chip, int page);

+50 −0

Original line number	Diff line number	Diff line
		@@ -205,6 +205,56 @@ static const struct mtd_ooblayout_ops nand_ooblayout_lp_hamming_ops = {
		.free = nand_ooblayout_free_lp_hamming,
		};

		static int nand_pairing_dist3_get_info(struct mtd_info *mtd, int page,
		struct mtd_pairing_info *info)
		{
		int lastpage = (mtd->erasesize / mtd->writesize) - 1;
		int dist = 3;

		if (page == lastpage)
		dist = 2;

		if (!page \|\| (page & 1)) {
		info->group = 0;
		info->pair = (page + 1) / 2;
		} else {
		info->group = 1;
		info->pair = (page + 1 - dist) / 2;
		}

		return 0;
		}

		static int nand_pairing_dist3_get_wunit(struct mtd_info *mtd,
		const struct mtd_pairing_info *info)
		{
		int lastpair = ((mtd->erasesize / mtd->writesize) - 1) / 2;
		int page = info->pair * 2;
		int dist = 3;

		if (!info->group && !info->pair)
		return 0;

		if (info->pair == lastpair && info->group)
		dist = 2;

		if (!info->group)
		page--;
		else if (info->pair)
		page += dist - 1;

		if (page >= mtd->erasesize / mtd->writesize)
		return -EINVAL;

		return page;
		}

		const struct mtd_pairing_scheme dist3_pairing_scheme = {
		.ngroups = 2,
		.get_info = nand_pairing_dist3_get_info,
		.get_wunit = nand_pairing_dist3_get_wunit,
		};

		static int check_offs_len(struct nand_chip *chip, loff_t ofs, uint64_t len)
		{
		int ret = 0;