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author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-21 20:38:29 +0300 |
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committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-28 18:28:59 +0300 |
commit | 470c29d1c28d23bdd86456bc431b8f26f8727903 (patch) | |
tree | 63f650dd9f6b9f024127727db7d8409a6f774404 /include/linux | |
parent | 52cde35b9645e60a0c8e4040136476c4f9804110 (diff) | |
download | u-boot-470c29d1c28d23bdd86456bc431b8f26f8727903.tar.xz |
mtd: nand: add generic helpers to check, match, maximize ECC settings
Driver are responsible for setting up ECC parameters correctly.
Those include:
- Check if ECC parameters specified (usually by DT) are valid
- Meet the chip's ECC requirement
- Maximize ECC strength if NAND_ECC_MAXIMIZE flag is set
The logic can be generalized by factoring out common code.
This commit adds 3 helpers to the NAND framework:
nand_check_ecc_caps - Check if preset step_size and strength are valid
nand_match_ecc_req - Match the chip's requirement
nand_maximize_ecc - Maximize the ECC strength
To use the helpers above, a driver needs to provide:
- Data array of supported ECC step size and strength
- A hook that calculates ECC bytes from the combination of
step_size and strength.
By using those helpers, code duplication among drivers will be
reduced.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[Linux commit: 2c8f8afa7f92acb07641bf95b940d384ed1d0294]
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/mtd/nand.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index b1a664815d..2d5f9a4907 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -488,6 +488,30 @@ struct nand_hw_control { }; /** + * struct nand_ecc_step_info - ECC step information of ECC engine + * @stepsize: data bytes per ECC step + * @strengths: array of supported strengths + * @nstrengths: number of supported strengths + */ +struct nand_ecc_step_info { + int stepsize; + const int *strengths; + int nstrengths; +}; + +/** + * struct nand_ecc_caps - capability of ECC engine + * @stepinfos: array of ECC step information + * @nstepinfos: number of ECC step information + * @calc_ecc_bytes: driver's hook to calculate ECC bytes per step + */ +struct nand_ecc_caps { + const struct nand_ecc_step_info *stepinfos; + int nstepinfos; + int (*calc_ecc_bytes)(int step_size, int strength); +}; + +/** * struct nand_ecc_ctrl - Control structure for ECC * @mode: ECC mode * @steps: number of ECC steps per page @@ -1218,6 +1242,15 @@ int nand_check_erased_ecc_chunk(void *data, int datalen, void *extraoob, int extraooblen, int threshold); +int nand_check_ecc_caps(struct nand_chip *chip, + const struct nand_ecc_caps *caps, int oobavail); + +int nand_match_ecc_req(struct nand_chip *chip, + const struct nand_ecc_caps *caps, int oobavail); + +int nand_maximize_ecc(struct nand_chip *chip, + const struct nand_ecc_caps *caps, int oobavail); + /* Reset and initialize a NAND device */ int nand_reset(struct nand_chip *chip, int chipnr); |