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author | Rafał Miłecki <zajec5@gmail.com> | 2016-04-17 22:53:05 +0200 |
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committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-05-05 23:55:10 +0200 |
commit | 06f384c9010ea7fa1146b9dfdd419d99c9b8a962 (patch) | |
tree | 0c93f6f3bfca05225e784fb5f73556ab8782f8f3 /drivers/mtd | |
parent | ef296dc947f6a9300a7fb5b696d1e1f543479e18 (diff) | |
download | linux-06f384c9010ea7fa1146b9dfdd419d99c9b8a962.tar.gz linux-06f384c9010ea7fa1146b9dfdd419d99c9b8a962.tar.bz2 linux-06f384c9010ea7fa1146b9dfdd419d99c9b8a962.zip |
mtd: nand: read ECC algorithm from the new field
Now we have all drivers properly setting this new field we can start
using it. For a very short period of time we should support both values:
NAND_ECC_SOFT and NAND_ECC_SOFT_BCH treating them the same. It's because
of_get_nand_ecc_mode may still be setting NAND_ECC_SOFT_BCH.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/nand/nand_base.c | 146 |
1 files changed, 85 insertions, 61 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 2a049576ab31..9f967531bc68 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -4171,6 +4171,83 @@ int nand_scan_ident(struct mtd_info *mtd, int maxchips, } EXPORT_SYMBOL(nand_scan_ident); +static int nand_set_ecc_soft_ops(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct nand_ecc_ctrl *ecc = &chip->ecc; + + if (WARN_ON(ecc->mode != NAND_ECC_SOFT && + ecc->mode != NAND_ECC_SOFT_BCH)) + return -EINVAL; + + switch (ecc->algo) { + case NAND_ECC_HAMMING: + ecc->calculate = nand_calculate_ecc; + ecc->correct = nand_correct_data; + ecc->read_page = nand_read_page_swecc; + ecc->read_subpage = nand_read_subpage; + ecc->write_page = nand_write_page_swecc; + ecc->read_page_raw = nand_read_page_raw; + ecc->write_page_raw = nand_write_page_raw; + ecc->read_oob = nand_read_oob_std; + ecc->write_oob = nand_write_oob_std; + if (!ecc->size) + ecc->size = 256; + ecc->bytes = 3; + ecc->strength = 1; + return 0; + case NAND_ECC_BCH: + if (!mtd_nand_has_bch()) { + WARN(1, "CONFIG_MTD_NAND_ECC_BCH not enabled\n"); + return -EINVAL; + } + ecc->calculate = nand_bch_calculate_ecc; + ecc->correct = nand_bch_correct_data; + ecc->read_page = nand_read_page_swecc; + ecc->read_subpage = nand_read_subpage; + ecc->write_page = nand_write_page_swecc; + ecc->read_page_raw = nand_read_page_raw; + ecc->write_page_raw = nand_write_page_raw; + ecc->read_oob = nand_read_oob_std; + ecc->write_oob = nand_write_oob_std; + /* + * Board driver should supply ecc.size and ecc.strength + * values to select how many bits are correctable. + * Otherwise, default to 4 bits for large page devices. + */ + if (!ecc->size && (mtd->oobsize >= 64)) { + ecc->size = 512; + ecc->strength = 4; + } + + /* + * if no ecc placement scheme was provided pickup the default + * large page one. + */ + if (!mtd->ooblayout) { + /* handle large page devices only */ + if (mtd->oobsize < 64) { + WARN(1, "OOB layout is required when using software BCH on small pages\n"); + return -EINVAL; + } + + mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops); + } + + /* See nand_bch_init() for details. */ + ecc->bytes = 0; + ecc->priv = nand_bch_init(mtd); + if (!ecc->priv) { + WARN(1, "BCH ECC initialization failed!\n"); + return -EINVAL; + } + return 0; + default: + WARN(1, "Unsupported ECC algorithm!\n"); + return -EINVAL; + } +} + /* * Check if the chip configuration meet the datasheet requirements. @@ -4246,7 +4323,9 @@ int nand_scan_tail(struct mtd_info *mtd) /* * If no default placement scheme is given, select an appropriate one. */ - if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) { + if (!mtd->ooblayout && + !((ecc->mode == NAND_ECC_SOFT || ecc->mode == NAND_ECC_SOFT_BCH) && + ecc->algo == NAND_ECC_BCH)) { switch (mtd->oobsize) { case 8: case 16: @@ -4340,66 +4419,9 @@ int nand_scan_tail(struct mtd_info *mtd) ecc->algo = NAND_ECC_HAMMING; case NAND_ECC_SOFT: - ecc->calculate = nand_calculate_ecc; - ecc->correct = nand_correct_data; - ecc->read_page = nand_read_page_swecc; - ecc->read_subpage = nand_read_subpage; - ecc->write_page = nand_write_page_swecc; - ecc->read_page_raw = nand_read_page_raw; - ecc->write_page_raw = nand_write_page_raw; - ecc->read_oob = nand_read_oob_std; - ecc->write_oob = nand_write_oob_std; - if (!ecc->size) - ecc->size = 256; - ecc->bytes = 3; - ecc->strength = 1; - break; - case NAND_ECC_SOFT_BCH: - if (!mtd_nand_has_bch()) { - WARN(1, "CONFIG_MTD_NAND_ECC_BCH not enabled\n"); - ret = -EINVAL; - goto err_free; - } - ecc->calculate = nand_bch_calculate_ecc; - ecc->correct = nand_bch_correct_data; - ecc->read_page = nand_read_page_swecc; - ecc->read_subpage = nand_read_subpage; - ecc->write_page = nand_write_page_swecc; - ecc->read_page_raw = nand_read_page_raw; - ecc->write_page_raw = nand_write_page_raw; - ecc->read_oob = nand_read_oob_std; - ecc->write_oob = nand_write_oob_std; - /* - * Board driver should supply ecc.size and ecc.strength values - * to select how many bits are correctable. Otherwise, default - * to 4 bits for large page devices. - */ - if (!ecc->size && (mtd->oobsize >= 64)) { - ecc->size = 512; - ecc->strength = 4; - } - - /* - * if no ecc placement scheme was provided pickup the default - * large page one. - */ - if (!mtd->ooblayout) { - /* handle large page devices only */ - if (mtd->oobsize < 64) { - WARN(1, "OOB layout is required when using software BCH on small pages\n"); - ret = -EINVAL; - goto err_free; - } - - mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops); - } - - /* See nand_bch_init() for details. */ - ecc->bytes = 0; - ecc->priv = nand_bch_init(mtd); - if (!ecc->priv) { - WARN(1, "BCH ECC initialization failed!\n"); + ret = nand_set_ecc_soft_ops(mtd); + if (ret) { ret = -EINVAL; goto err_free; } @@ -4585,7 +4607,9 @@ void nand_release(struct mtd_info *mtd) { struct nand_chip *chip = mtd_to_nand(mtd); - if (chip->ecc.mode == NAND_ECC_SOFT_BCH) + if ((chip->ecc.mode == NAND_ECC_SOFT || + chip->ecc.mode == NAND_ECC_SOFT_BCH) && + chip->ecc.algo == NAND_ECC_BCH) nand_bch_free((struct nand_bch_control *)chip->ecc.priv); mtd_device_unregister(mtd); |