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Received: from relay6-d.mail.gandi.net ([217.70.183.198]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ilyH1-000501-Mp for linux-mtd@lists.infradead.org; Mon, 30 Dec 2019 16:52:08 +0000 X-Originating-IP: 91.224.148.103 Received: from localhost.localdomain (unknown [91.224.148.103]) (Authenticated sender: miquel.raynal@bootlin.com) by relay6-d.mail.gandi.net (Postfix) with ESMTPSA id D9705C0005; Mon, 30 Dec 2019 16:51:32 +0000 (UTC) From: Miquel Raynal To: Richard Weinberger , Vignesh Raghavendra , Tudor Ambarus , Subject: [PATCH 2/8] mtd: rawnand: Define the "distance 3" MLC pairing scheme Date: Mon, 30 Dec 2019 17:51:23 +0100 Message-Id: <20191230165129.11925-3-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191230165129.11925-1-miquel.raynal@bootlin.com> References: <20191230165129.11925-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Boris Brezillon , Boris Brezillon , Thomas Petazzoni , Miquel Raynal Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org From: Boris Brezillon Define a new page pairing scheme for MLC NANDs with a distance of 3 pages between the lower and upper page. Signed-off-by: Boris Brezillon Signed-off-by: Miquel Raynal --- drivers/mtd/nand/raw/internals.h | 3 ++ drivers/mtd/nand/raw/nand_base.c | 50 ++++++++++++++++++++++++++++++++ 2 files changed, 53 insertions(+) diff --git a/drivers/mtd/nand/raw/internals.h b/drivers/mtd/nand/raw/internals.h index cba6fe7dd8c4..8f6fdda681cc 100644 --- a/drivers/mtd/nand/raw/internals.h +++ b/drivers/mtd/nand/raw/internals.h @@ -74,6 +74,9 @@ 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); diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index f64e3b6605c6..a471f5714cd6 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -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; -- 2.20.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/