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Date: Sat, 30 Mar 2019 15:23:23 +0100
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: linux-mtd@...ts.infradead.org,
Miquel Raynal <miquel.raynal@...tlin.com>,
Brian Norris <computersforpeace@...il.com>,
linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
Richard Weinberger <richard@....at>,
David Woodhouse <dwmw2@...radead.org>,
Boris Brezillon <bbrezillon@...nel.org>
Subject: Re: [PATCH v4 1/9] mtd: rawnand: denali: use nand_chip pointer more
for internal functions
On Fri, 29 Mar 2019 16:28:13 +0900
Masahiro Yamada <yamada.masahiro@...ionext.com> wrote:
> With the recent refactoring, the NAND driver hooks now take a pointer
> to nand_chip. Add to_denali() in order to convert (struct nand_chip *)
> to (struct denali_nand_info *) directly. It is more useful than the
> current mtd_to_denali().
>
> I changed some helper functions to take (struct nand_chip *). This will
> avoid pointer conversion back and forth, and ease further development.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
> drivers/mtd/nand/raw/denali.c | 57 ++++++++++++++++++++++++-------------------
> 1 file changed, 32 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/denali.c b/drivers/mtd/nand/raw/denali.c
> index 24aeafc..4ac1314 100644
> --- a/drivers/mtd/nand/raw/denali.c
> +++ b/drivers/mtd/nand/raw/denali.c
> @@ -47,6 +47,11 @@ static inline struct denali_nand_info *mtd_to_denali(struct mtd_info *mtd)
> return container_of(mtd_to_nand(mtd), struct denali_nand_info, nand);
> }
>
> +static struct denali_nand_info *to_denali(struct nand_chip *chip)
> +{
> + return container_of(chip, struct denali_nand_info, nand);
> +}
> +
> /*
> * Direct Addressing - the slave address forms the control information (command
> * type, bank, block, and page address). The slave data is the actual data to
> @@ -282,12 +287,12 @@ static void denali_cmd_ctrl(struct nand_chip *chip, int dat, unsigned int ctrl)
> denali->host_write(denali, DENALI_BANK(denali) | type, dat);
> }
>
> -static int denali_check_erased_page(struct mtd_info *mtd,
> - struct nand_chip *chip, uint8_t *buf,
> +static int denali_check_erased_page(struct nand_chip *chip,
> + struct denali_nand_info *denali, u8 *buf,
You don't need to pass both chip and denali, as one can be extracted
from the other.
> unsigned long uncor_ecc_flags,
> unsigned int max_bitflips)
> {
> - struct denali_nand_info *denali = mtd_to_denali(mtd);
> + struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
> uint8_t *ecc_code = chip->oob_poi + denali->oob_skip_bytes;
> int ecc_steps = chip->ecc.steps;
> int ecc_size = chip->ecc.size;
> @@ -303,9 +308,9 @@ static int denali_check_erased_page(struct mtd_info *mtd,
> NULL, 0,
> chip->ecc.strength);
> if (stat < 0) {
> - mtd->ecc_stats.failed++;
> + ecc_stats->failed++;
> } else {
> - mtd->ecc_stats.corrected += stat;
> + ecc_stats->corrected += stat;
> max_bitflips = max_t(unsigned int, max_bitflips, stat);
> }
>
> @@ -316,11 +321,11 @@ static int denali_check_erased_page(struct mtd_info *mtd,
> return max_bitflips;
> }
>
> -static int denali_hw_ecc_fixup(struct mtd_info *mtd,
> +static int denali_hw_ecc_fixup(struct nand_chip *chip,
> struct denali_nand_info *denali,
Ditto.
> unsigned long *uncor_ecc_flags)
> {
> - struct nand_chip *chip = mtd_to_nand(mtd);
> + struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
> int bank = denali->active_bank;
> uint32_t ecc_cor;
> unsigned int max_bitflips;
> @@ -346,16 +351,17 @@ static int denali_hw_ecc_fixup(struct mtd_info *mtd,
> * Unfortunately, we can not know the total number of corrected bits in
> * the page. Increase the stats by max_bitflips. (compromised solution)
> */
> - mtd->ecc_stats.corrected += max_bitflips;
> + ecc_stats->corrected += max_bitflips;
>
> return max_bitflips;
> }
>
> -static int denali_sw_ecc_fixup(struct mtd_info *mtd,
> +static int denali_sw_ecc_fixup(struct nand_chip *chip,
> struct denali_nand_info *denali,
> unsigned long *uncor_ecc_flags, uint8_t *buf)
> {
> - unsigned int ecc_size = denali->nand.ecc.size;
> + struct mtd_ecc_stats *ecc_stats = &nand_to_mtd(chip)->ecc_stats;
> + unsigned int ecc_size = chip->ecc.size;
> unsigned int bitflips = 0;
> unsigned int max_bitflips = 0;
> uint32_t err_addr, err_cor_info;
> @@ -404,7 +410,7 @@ static int denali_sw_ecc_fixup(struct mtd_info *mtd,
> /* correct the ECC error */
> flips_in_byte = hweight8(buf[offset] ^ err_cor_value);
> buf[offset] ^= err_cor_value;
> - mtd->ecc_stats.corrected += flips_in_byte;
> + ecc_stats->corrected += flips_in_byte;
> bitflips += flips_in_byte;
>
> max_bitflips = max(max_bitflips, bitflips);
> @@ -587,9 +593,11 @@ static int denali_dma_xfer(struct denali_nand_info *denali, void *buf,
> return ret;
> }
>
> -static int denali_data_xfer(struct denali_nand_info *denali, void *buf,
> - size_t size, int page, int raw, int write)
> +static int denali_data_xfer(struct nand_chip *chip, void *buf, size_t size,
> + int page, int raw, int write)
> {
> + struct denali_nand_info *denali = to_denali(chip);
> +
> iowrite32(raw ? 0 : ECC_ENABLE__FLAG, denali->reg + ECC_ENABLE);
> iowrite32(raw ? TRANSFER_SPARE_REG__FLAG : 0,
> denali->reg + TRANSFER_SPARE_REG);
> @@ -678,7 +686,7 @@ static int denali_read_page_raw(struct nand_chip *chip, uint8_t *buf,
> size_t size = writesize + oobsize;
> int ret, i, pos, len;
>
> - ret = denali_data_xfer(denali, tmp_buf, size, page, 1, 0);
> + ret = denali_data_xfer(chip, tmp_buf, size, page, 1, 0);
> if (ret)
> return ret;
>
> @@ -766,14 +774,14 @@ static int denali_read_page(struct nand_chip *chip, uint8_t *buf,
> int stat = 0;
> int ret;
>
> - ret = denali_data_xfer(denali, buf, mtd->writesize, page, 0, 0);
> + ret = denali_data_xfer(chip, buf, mtd->writesize, page, 0, 0);
> if (ret && ret != -EBADMSG)
> return ret;
>
> if (denali->caps & DENALI_CAP_HW_ECC_FIXUP)
> - stat = denali_hw_ecc_fixup(mtd, denali, &uncor_ecc_flags);
> + stat = denali_hw_ecc_fixup(chip, denali, &uncor_ecc_flags);
> else if (ret == -EBADMSG)
> - stat = denali_sw_ecc_fixup(mtd, denali, &uncor_ecc_flags, buf);
> + stat = denali_sw_ecc_fixup(chip, denali, &uncor_ecc_flags, buf);
>
> if (stat < 0)
> return stat;
> @@ -783,7 +791,7 @@ static int denali_read_page(struct nand_chip *chip, uint8_t *buf,
> if (ret)
> return ret;
>
> - stat = denali_check_erased_page(mtd, chip, buf,
> + stat = denali_check_erased_page(chip, denali, buf,
> uncor_ecc_flags, stat);
> }
>
> @@ -866,17 +874,16 @@ static int denali_write_page_raw(struct nand_chip *chip, const uint8_t *buf,
> memcpy(tmp_buf + size - len, oob, len);
> }
>
> - return denali_data_xfer(denali, tmp_buf, size, page, 1, 1);
> + return denali_data_xfer(chip, tmp_buf, size, page, 1, 1);
> }
>
> static int denali_write_page(struct nand_chip *chip, const uint8_t *buf,
> int oob_required, int page)
> {
> struct mtd_info *mtd = nand_to_mtd(chip);
> - struct denali_nand_info *denali = mtd_to_denali(mtd);
>
> - return denali_data_xfer(denali, (void *)buf, mtd->writesize,
> - page, 0, 1);
> + return denali_data_xfer(chip, (void *)buf, mtd->writesize, page,
> + 0, 1);
> }
>
> static void denali_select_chip(struct nand_chip *chip, int cs)
> @@ -1092,9 +1099,9 @@ static const struct mtd_ooblayout_ops denali_ooblayout_ops = {
> .free = denali_ooblayout_free,
> };
>
> -static int denali_multidev_fixup(struct denali_nand_info *denali)
> +static int denali_multidev_fixup(struct nand_chip *chip)
> {
> - struct nand_chip *chip = &denali->nand;
> + struct denali_nand_info *denali = to_denali(chip);
> struct mtd_info *mtd = nand_to_mtd(chip);
>
> /*
> @@ -1222,7 +1229,7 @@ static int denali_attach_chip(struct nand_chip *chip)
> chip->ecc.read_oob = denali_read_oob;
> chip->ecc.write_oob = denali_write_oob;
>
> - ret = denali_multidev_fixup(denali);
> + ret = denali_multidev_fixup(chip);
> if (ret)
> return ret;
>
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