From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail1.bemta8.messagelabs.com ([216.82.243.206]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c6DvO-00019K-So for linux-mtd@lists.infradead.org; Mon, 14 Nov 2016 09:51:41 +0000 To: Boris Brezillon , Richard Weinberger CC: linux-mtd , Mason , Sebastian Frias From: Marc Gonzalez Subject: [PATCH] mtd: nand: Support controllers with custom page accessors Message-ID: <5829883A.8080307@sigmadesigns.com> Date: Mon, 14 Nov 2016 10:47:38 +0100 MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: 7bit List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , If your controller already sends the required NAND commands when reading or writing a page, then the framework is not supposed to send READ0 and SEQIN/PAGEPROG respectively. Signed-off-by: Marc Gonzalez --- drivers/mtd/nand/nand_base.c | 31 ++++++++++++++++++++++++++++--- drivers/mtd/nand/tango_nand.c | 21 ++++++++++++--------- include/linux/mtd/nand.h | 12 ++++++++++++ 3 files changed, 52 insertions(+), 12 deletions(-) diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 50cdf37cb8e4..b8ea6b397c16 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -1970,7 +1970,8 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, __func__, buf); read_retry: - chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page); + if (nand_default_page_accessors(&chip->ecc)) + chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page); /* * Now read the page into the buffer. Absent an error, @@ -2658,7 +2659,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip, else subpage = 0; - chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page); + if (nand_default_page_accessors(&chip->ecc)) + chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page); if (unlikely(raw)) status = chip->ecc.write_page_raw(mtd, chip, buf, @@ -2681,7 +2683,8 @@ static int nand_write_page(struct mtd_info *mtd, struct nand_chip *chip, if (!cached || !NAND_HAS_CACHEPROG(chip)) { - chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); + if (nand_default_page_accessors(&chip->ecc)) + chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); status = chip->waitfunc(mtd, chip); /* * See if operation failed and additional status checks are @@ -4539,6 +4542,25 @@ static bool nand_ecc_strength_good(struct mtd_info *mtd) return corr >= ds_corr && ecc->strength >= chip->ecc_strength_ds; } +static bool invalid_ecc_page_accessors(struct nand_chip *chip) +{ + struct nand_ecc_ctrl *ecc = &chip->ecc; + + if (nand_default_page_accessors(ecc)) + return false; + + /* + * NAND_ECC_CUSTOM_PAGE_ACCESS flag is set, make sure the NAND + * controller driver implements all the page accessors because + * default helpers are not suitable when the core does not + * send the READ0/PAGEPROG commands. + */ + return (!ecc->read_page || !ecc->write_page || + !ecc->read_page_raw || !ecc->write_page_raw || + (NAND_HAS_SUBPAGE_READ(chip) && !ecc->read_subpage) || + (NAND_HAS_SUBPAGE_WRITE(chip) && !ecc->write_subpage)); +} + /** * nand_scan_tail - [NAND Interface] Scan for the NAND device * @mtd: MTD device structure @@ -4559,6 +4581,9 @@ int nand_scan_tail(struct mtd_info *mtd) !(chip->bbt_options & NAND_BBT_USE_FLASH))) return -EINVAL; + if (WARN_ON(invalid_ecc_page_accessors(chip))) + return -EINVAL; + if (!(chip->options & NAND_OWN_BUFFERS)) { nbuf = kzalloc(sizeof(*nbuf) + mtd->writesize + mtd->oobsize * 3, GFP_KERNEL); diff --git a/drivers/mtd/nand/tango_nand.c b/drivers/mtd/nand/tango_nand.c index fd8cf414cb2b..7ed35348993e 100644 --- a/drivers/mtd/nand/tango_nand.c +++ b/drivers/mtd/nand/tango_nand.c @@ -343,7 +343,7 @@ static void aux_write(struct nand_chip *chip, const u8 **buf, int len, int *pos) * buf = | PKT_0 | ... | PKT_N | * +-----------------+-----+-----------------+ */ -static int raw_read(struct nand_chip *chip, u8 *buf, u8 *oob) +static void raw_read(struct nand_chip *chip, u8 *buf, u8 *oob) { u8 *oob_orig = oob; const int page_size = chip->mtd.writesize; @@ -367,11 +367,9 @@ static int raw_read(struct nand_chip *chip, u8 *buf, u8 *oob) aux_read(chip, &oob_orig, BBM_SIZE, &pos); aux_read(chip, &buf, pkt_size - rem, &pos); aux_read(chip, &oob, ecc_size, &pos); - - return 0; } -static int raw_write(struct nand_chip *chip, const u8 *buf, const u8 *oob) +static void raw_write(struct nand_chip *chip, const u8 *buf, const u8 *oob) { const u8 *oob_orig = oob; const int page_size = chip->mtd.writesize; @@ -395,27 +393,31 @@ static int raw_write(struct nand_chip *chip, const u8 *buf, const u8 *oob) aux_write(chip, &oob_orig, BBM_SIZE, &pos); aux_write(chip, &buf, pkt_size - rem, &pos); aux_write(chip, &oob, ecc_size, &pos); - - return 0; } static int tango_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip, u8 *buf, int oob_required, int page) { - return raw_read(chip, buf, chip->oob_poi); + chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page); + raw_read(chip, buf, chip->oob_poi); + return 0; } static int tango_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip, const u8 *buf, int oob_required, int page) { - return raw_write(chip, buf, chip->oob_poi); + chip->cmdfunc(mtd, NAND_CMD_SEQIN, 0, page); + raw_write(chip, buf, chip->oob_poi); + chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1); + return 0; } static int tango_read_oob(struct mtd_info *mtd, struct nand_chip *chip, int page) { chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page); - return raw_read(chip, NULL, chip->oob_poi); + raw_read(chip, NULL, chip->oob_poi); + return 0; } static int tango_write_oob(struct mtd_info *mtd, struct nand_chip *chip, @@ -553,6 +555,7 @@ static int chip_init(struct device *dev, struct device_node *np) ecc->write_page = tango_write_page; ecc->read_oob = tango_read_oob; ecc->write_oob = tango_write_oob; + ecc->options = NAND_ECC_CUSTOM_PAGE_ACCESS; err = nand_scan_tail(mtd); if (err) diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 06d0c9d740f7..a95a27a30005 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -142,6 +142,12 @@ enum nand_ecc_algo { */ #define NAND_ECC_GENERIC_ERASED_CHECK BIT(0) #define NAND_ECC_MAXIMIZE BIT(1) +/* + * If your controller already sends the required NAND commands when + * reading or writing a page, then the framework is not supposed to + * send READ0 and SEQIN/PAGEPROG respectively. + */ +#define NAND_ECC_CUSTOM_PAGE_ACCESS BIT(2) /* Bit mask for flags passed to do_nand_read_ecc */ #define NAND_GET_DEVICE 0x80 @@ -186,6 +192,7 @@ enum nand_ecc_algo { /* Macros to identify the above */ #define NAND_HAS_CACHEPROG(chip) ((chip->options & NAND_CACHEPRG)) #define NAND_HAS_SUBPAGE_READ(chip) ((chip->options & NAND_SUBPAGE_READ)) +#define NAND_HAS_SUBPAGE_WRITE(chip) !(chip->options & NAND_NO_SUBPAGE_WRITE) /* Non chip related options */ /* This option skips the bbt scan during initialization. */ @@ -568,6 +575,11 @@ struct nand_ecc_ctrl { int page); }; +static inline int nand_default_page_accessors(struct nand_ecc_ctrl *ecc) +{ + return !(ecc->options & NAND_ECC_CUSTOM_PAGE_ACCESS); +} + /** * struct nand_buffers - buffer structure for read/write * @ecccalc: buffer pointer for calculated ECC, size is oobsize. -- 2.9.0