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Message-ID: <20160413175426.3d53bcaf@bbrezillon>
Date: Wed, 13 Apr 2016 17:54:26 +0200
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
linux-mtd@...ts.infradead.org,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
Richard Weinberger <richard@....at>
Cc: linux-arm-kernel@...ts.infradead.org,
Nicolas Ferre <nicolas.ferre@...el.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
Wenyou Yang <wenyou.yang@...el.com>,
Josh Wu <rainyfeeling@...look.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 04/50] mtd: nand: atmel: use mtd_ooblayout_xxx()
helpers where appropriate
Oops, for --in-reply-to. Please ignore this patch.
On Wed, 13 Apr 2016 17:51:31 +0200
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:
> The mtd_ooblayout_xxx() helper functions have been added to avoid direct
> accesses to the ecclayout field, and thus ease for future reworks.
> Use these helpers in all places where the oobfree[] and eccpos[] arrays
> where directly accessed.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
> drivers/mtd/nand/atmel_nand.c | 50 +++++++++++++++++++++++++++----------------
> 1 file changed, 31 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index 5e716f2..b132c8f 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -833,13 +833,16 @@ static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
> dev_dbg(host->dev, "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
> pos, bit_pos, err_byte, *(buf + byte_pos));
> } else {
> + struct mtd_oob_region oobregion;
> +
> /* Bit flip in OOB area */
> tmp = sector_num * nand_chip->ecc.bytes
> + (byte_pos - sector_size);
> err_byte = ecc[tmp];
> ecc[tmp] ^= (1 << bit_pos);
>
> - pos = tmp + nand_chip->ecc.layout->eccpos[0];
> + mtd_ooblayout_ecc(mtd, 0, &oobregion);
> + pos = tmp + oobregion.offset;
> dev_dbg(host->dev, "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
> pos, bit_pos, err_byte, ecc[tmp]);
> }
> @@ -931,7 +934,6 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
> struct atmel_nand_host *host = nand_get_controller_data(chip);
> int eccsize = chip->ecc.size * chip->ecc.steps;
> uint8_t *oob = chip->oob_poi;
> - uint32_t *eccpos = chip->ecc.layout->eccpos;
> uint32_t stat;
> unsigned long end_time;
> int bitflips = 0;
> @@ -953,7 +955,11 @@ static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
>
> stat = pmecc_readl_relaxed(host->ecc, ISR);
> if (stat != 0) {
> - bitflips = pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]);
> + struct mtd_oob_region oobregion;
> +
> + mtd_ooblayout_ecc(mtd, 0, &oobregion);
> + bitflips = pmecc_correction(mtd, stat, buf,
> + &oob[oobregion.offset]);
> if (bitflips < 0)
> /* uncorrectable errors */
> return 0;
> @@ -967,8 +973,8 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
> int page)
> {
> struct atmel_nand_host *host = nand_get_controller_data(chip);
> - uint32_t *eccpos = chip->ecc.layout->eccpos;
> - int i, j;
> + struct mtd_oob_region oobregion = { };
> + int i, j, section = 0;
> unsigned long end_time;
>
> if (!host->nfc || !host->nfc->write_by_sram) {
> @@ -987,11 +993,14 @@ static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
>
> for (i = 0; i < chip->ecc.steps; i++) {
> for (j = 0; j < chip->ecc.bytes; j++) {
> - int pos;
> + if (!oobregion.length)
> + mtd_ooblayout_ecc(mtd, section, &oobregion);
>
> - pos = i * chip->ecc.bytes + j;
> - chip->oob_poi[eccpos[pos]] =
> + chip->oob_poi[oobregion.offset] =
> pmecc_readb_ecc_relaxed(host->ecc, i, j);
> + oobregion.length--;
> + oobregion.offset++;
> + section++;
> }
> }
> chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> @@ -1005,6 +1014,7 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
> struct atmel_nand_host *host = nand_get_controller_data(nand_chip);
> uint32_t val = 0;
> struct nand_ecclayout *ecc_layout;
> + struct mtd_oob_region oobregion;
>
> pmecc_writel(host->ecc, CTRL, PMECC_CTRL_RST);
> pmecc_writel(host->ecc, CTRL, PMECC_CTRL_DISABLE);
> @@ -1056,9 +1066,10 @@ static void atmel_pmecc_core_init(struct mtd_info *mtd)
>
> ecc_layout = nand_chip->ecc.layout;
> pmecc_writel(host->ecc, SAREA, mtd->oobsize - 1);
> - pmecc_writel(host->ecc, SADDR, ecc_layout->eccpos[0]);
> + mtd_ooblayout_ecc(mtd, 0, &oobregion);
> + pmecc_writel(host->ecc, SADDR, oobregion.offset);
> pmecc_writel(host->ecc, EADDR,
> - ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
> + oobregion.offset + ecc_layout->eccbytes - 1);
> /* See datasheet about PMECC Clock Control Register */
> pmecc_writel(host->ecc, CLK, 2);
> pmecc_writel(host->ecc, IDR, 0xff);
> @@ -1359,12 +1370,12 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
> {
> int eccsize = chip->ecc.size;
> int eccbytes = chip->ecc.bytes;
> - uint32_t *eccpos = chip->ecc.layout->eccpos;
> uint8_t *p = buf;
> uint8_t *oob = chip->oob_poi;
> uint8_t *ecc_pos;
> int stat;
> unsigned int max_bitflips = 0;
> + struct mtd_oob_region oobregion = {};
>
> /*
> * Errata: ALE is incorrectly wired up to the ECC controller
> @@ -1382,19 +1393,20 @@ static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
> chip->read_buf(mtd, p, eccsize);
>
> /* move to ECC position if needed */
> - if (eccpos[0] != 0) {
> - /* This only works on large pages
> - * because the ECC controller waits for
> - * NAND_CMD_RNDOUTSTART after the
> - * NAND_CMD_RNDOUT.
> - * anyway, for small pages, the eccpos[0] == 0
> + mtd_ooblayout_ecc(mtd, 0, &oobregion);
> + if (oobregion.offset != 0) {
> + /*
> + * This only works on large pages because the ECC controller
> + * waits for NAND_CMD_RNDOUTSTART after the NAND_CMD_RNDOUT.
> + * Anyway, for small pages, the first ECC byte is at offset
> + * 0 in the OOB area.
> */
> chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
> - mtd->writesize + eccpos[0], -1);
> + mtd->writesize + oobregion.offset, -1);
> }
>
> /* the ECC controller needs to read the ECC just after the data */
> - ecc_pos = oob + eccpos[0];
> + ecc_pos = oob + oobregion.offset;
> chip->read_buf(mtd, ecc_pos, eccbytes);
>
> /* check if there's an error */
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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