diff options
| author | Alexander Couzens <lynxis@fe80.eu> | 2017-05-02 12:19:00 +0200 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2017-05-03 03:56:39 +0200 |
| commit | 6a623e07694437ad09f382a13f76cffc32239a7f (patch) | |
| tree | b189b4914fdc96540f99082f04ba9e94c3689e40 /drivers | |
| parent | mtd: oxnas_nand: Allocating more than necessary in probe() (diff) | |
| download | linux-6a623e07694437ad09f382a13f76cffc32239a7f.tar.xz linux-6a623e07694437ad09f382a13f76cffc32239a7f.zip | |
mtd: nand: add ooblayout for old hamming layout
The old 1-bit hamming layout requires ECC data to be placed at a
fixed offset, and not necessarily at the end of the OOB area.
Add this old layout back in order to fix legacy setups.
Fixes: 41b207a70d3a ("mtd: nand: implement the default mtd_ooblayout_ops")
Cc: <stable@vger.kernel.org>
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index ed49a1d634b0..d474378ed810 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -139,6 +139,74 @@ const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = { }; EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops); +/* + * Support the old "large page" layout used for 1-bit Hamming ECC where ECC + * are placed at a fixed offset. + */ +static int nand_ooblayout_ecc_lp_hamming(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct nand_ecc_ctrl *ecc = &chip->ecc; + + if (section) + return -ERANGE; + + switch (mtd->oobsize) { + case 64: + oobregion->offset = 40; + break; + case 128: + oobregion->offset = 80; + break; + default: + return -EINVAL; + } + + oobregion->length = ecc->total; + if (oobregion->offset + oobregion->length > mtd->oobsize) + return -ERANGE; + + return 0; +} + +static int nand_ooblayout_free_lp_hamming(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct nand_ecc_ctrl *ecc = &chip->ecc; + int ecc_offset = 0; + + if (section < 0 || section > 1) + return -ERANGE; + + switch (mtd->oobsize) { + case 64: + ecc_offset = 40; + break; + case 128: + ecc_offset = 80; + break; + default: + return -EINVAL; + } + + if (section == 0) { + oobregion->offset = 2; + oobregion->length = ecc_offset - 2; + } else { + oobregion->offset = ecc_offset + ecc->total; + oobregion->length = mtd->oobsize - oobregion->offset; + } + + return 0; +} + +const struct mtd_ooblayout_ops nand_ooblayout_lp_hamming_ops = { + .ecc = nand_ooblayout_ecc_lp_hamming, + .free = nand_ooblayout_free_lp_hamming, +}; + static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len) { @@ -4559,7 +4627,7 @@ int nand_scan_tail(struct mtd_info *mtd) break; case 64: case 128: - mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops); + mtd_set_ooblayout(mtd, &nand_ooblayout_lp_hamming_ops); break; default: WARN(1, "No oob scheme defined for oobsize %d\n", |