diff options
author | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-02-03 20:03:04 +0100 |
---|---|---|
committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-05-05 23:51:46 +0200 |
commit | e04dbf352820245b54f74200ac97327959f02c56 (patch) | |
tree | 8e5194d6c375fd60a0fe77e0e75f73388e6d5884 /drivers/mtd | |
parent | a894cf6c5a82c7ddcb1bad82d1e0af3d0ead9a41 (diff) |
mtd: nand: omap2: switch to mtd_ooblayout_ops
Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r-- | drivers/mtd/nand/omap2.c | 202 |
1 files changed, 121 insertions, 81 deletions
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index 38fe6b8a0b14..55916786d04e 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -178,8 +178,6 @@ struct omap_nand_info { struct gpmc_nand_regs reg; struct gpmc_nand_ops *ops; bool flash_bbt; - /* generated at runtime depending on ECC algorithm and layout selected */ - struct nand_ecclayout oobinfo; /* fields specific for BCHx_HW ECC scheme */ struct device *elm_dev; /* NAND ready gpio */ @@ -1714,20 +1712,115 @@ static int omap_get_dt_info(struct device *dev, struct omap_nand_info *info) return 0; } +static int omap_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct omap_nand_info *info = mtd_to_omap(mtd); + struct nand_chip *chip = &info->nand; + int off = BADBLOCK_MARKER_LENGTH; + + if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW && + !(chip->options & NAND_BUSWIDTH_16)) + off = 1; + + if (section) + return -ERANGE; + + oobregion->offset = off; + oobregion->length = chip->ecc.total; + + return 0; +} + +static int omap_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct omap_nand_info *info = mtd_to_omap(mtd); + struct nand_chip *chip = &info->nand; + int off = BADBLOCK_MARKER_LENGTH; + + if (info->ecc_opt == OMAP_ECC_HAM1_CODE_HW && + !(chip->options & NAND_BUSWIDTH_16)) + off = 1; + + if (section) + return -ERANGE; + + off += chip->ecc.total; + if (off >= mtd->oobsize) + return -ERANGE; + + oobregion->offset = off; + oobregion->length = mtd->oobsize - off; + + return 0; +} + +static const struct mtd_ooblayout_ops omap_ooblayout_ops = { + .ecc = omap_ooblayout_ecc, + .free = omap_ooblayout_free, +}; + +static int omap_sw_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + int off = BADBLOCK_MARKER_LENGTH; + + if (section >= chip->ecc.steps) + return -ERANGE; + + /* + * When SW correction is employed, one OMAP specific marker byte is + * reserved after each ECC step. + */ + oobregion->offset = off + (section * (chip->ecc.bytes + 1)); + oobregion->length = chip->ecc.bytes; + + return 0; +} + +static int omap_sw_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + int off = BADBLOCK_MARKER_LENGTH; + + if (section) + return -ERANGE; + + /* + * When SW correction is employed, one OMAP specific marker byte is + * reserved after each ECC step. + */ + off += ((chip->ecc.bytes + 1) * chip->ecc.steps); + if (off >= mtd->oobsize) + return -ERANGE; + + oobregion->offset = off; + oobregion->length = mtd->oobsize - off; + + return 0; +} + +static const struct mtd_ooblayout_ops omap_sw_ooblayout_ops = { + .ecc = omap_sw_ooblayout_ecc, + .free = omap_sw_ooblayout_free, +}; + static int omap_nand_probe(struct platform_device *pdev) { struct omap_nand_info *info; struct omap_nand_platform_data *pdata = NULL; struct mtd_info *mtd; struct nand_chip *nand_chip; - struct nand_ecclayout *ecclayout; int err; - int i; dma_cap_mask_t mask; unsigned sig; - unsigned oob_index; struct resource *res; struct device *dev = &pdev->dev; + int min_oobbytes = BADBLOCK_MARKER_LENGTH; + int oobbytes_per_step; info = devm_kzalloc(&pdev->dev, sizeof(struct omap_nand_info), GFP_KERNEL); @@ -1915,7 +2008,7 @@ static int omap_nand_probe(struct platform_device *pdev) /* * Bail out earlier to let NAND_ECC_SOFT code create its own - * ecclayout instead of using ours. + * ooblayout instead of using ours. */ if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) { nand_chip->ecc.mode = NAND_ECC_SOFT; @@ -1923,8 +2016,6 @@ static int omap_nand_probe(struct platform_device *pdev) } /* populate MTD interface based on ECC scheme */ - ecclayout = &info->oobinfo; - nand_chip->ecc.layout = ecclayout; switch (info->ecc_opt) { case OMAP_ECC_HAM1_CODE_HW: pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n"); @@ -1935,19 +2026,12 @@ static int omap_nand_probe(struct platform_device *pdev) nand_chip->ecc.calculate = omap_calculate_ecc; nand_chip->ecc.hwctl = omap_enable_hwecc; nand_chip->ecc.correct = omap_correct_data; - /* define ECC layout */ - ecclayout->eccbytes = nand_chip->ecc.bytes * - (mtd->writesize / - nand_chip->ecc.size); - if (nand_chip->options & NAND_BUSWIDTH_16) - oob_index = BADBLOCK_MARKER_LENGTH; - else - oob_index = 1; - for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) - ecclayout->eccpos[i] = oob_index; - /* no reserved-marker in ecclayout for this ecc-scheme */ - ecclayout->oobfree->offset = - ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; + mtd_set_ooblayout(mtd, &omap_ooblayout_ops); + oobbytes_per_step = nand_chip->ecc.bytes; + + if (!(nand_chip->options & NAND_BUSWIDTH_16)) + min_oobbytes = 1; + break; case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW: @@ -1959,19 +2043,9 @@ static int omap_nand_probe(struct platform_device *pdev) nand_chip->ecc.hwctl = omap_enable_hwecc_bch; nand_chip->ecc.correct = nand_bch_correct_data; nand_chip->ecc.calculate = omap_calculate_ecc_bch; - /* define ECC layout */ - ecclayout->eccbytes = nand_chip->ecc.bytes * - (mtd->writesize / - nand_chip->ecc.size); - oob_index = BADBLOCK_MARKER_LENGTH; - for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) { - ecclayout->eccpos[i] = oob_index; - if (((i + 1) % nand_chip->ecc.bytes) == 0) - oob_index++; - } - /* include reserved-marker in ecclayout->oobfree calculation */ - ecclayout->oobfree->offset = 1 + - ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; + mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops); + /* Reserve one byte for the OMAP marker */ + oobbytes_per_step = nand_chip->ecc.bytes + 1; /* software bch library is used for locating errors */ nand_chip->ecc.priv = nand_bch_init(mtd); if (!nand_chip->ecc.priv) { @@ -1993,16 +2067,8 @@ static int omap_nand_probe(struct platform_device *pdev) nand_chip->ecc.calculate = omap_calculate_ecc_bch; nand_chip->ecc.read_page = omap_read_page_bch; nand_chip->ecc.write_page = omap_write_page_bch; - /* define ECC layout */ - ecclayout->eccbytes = nand_chip->ecc.bytes * - (mtd->writesize / - nand_chip->ecc.size); - oob_index = BADBLOCK_MARKER_LENGTH; - for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) - ecclayout->eccpos[i] = oob_index; - /* reserved marker already included in ecclayout->eccbytes */ - ecclayout->oobfree->offset = - ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; + mtd_set_ooblayout(mtd, &omap_ooblayout_ops); + oobbytes_per_step = nand_chip->ecc.bytes; err = elm_config(info->elm_dev, BCH4_ECC, mtd->writesize / nand_chip->ecc.size, @@ -2020,19 +2086,9 @@ static int omap_nand_probe(struct platform_device *pdev) nand_chip->ecc.hwctl = omap_enable_hwecc_bch; nand_chip->ecc.correct = nand_bch_correct_data; nand_chip->ecc.calculate = omap_calculate_ecc_bch; - /* define ECC layout */ - ecclayout->eccbytes = nand_chip->ecc.bytes * - (mtd->writesize / - nand_chip->ecc.size); - oob_index = BADBLOCK_MARKER_LENGTH; - for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) { - ecclayout->eccpos[i] = oob_index; - if (((i + 1) % nand_chip->ecc.bytes) == 0) - oob_index++; - } - /* include reserved-marker in ecclayout->oobfree calculation */ - ecclayout->oobfree->offset = 1 + - ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; + mtd_set_ooblayout(mtd, &omap_sw_ooblayout_ops); + /* Reserve one byte for the OMAP marker */ + oobbytes_per_step = nand_chip->ecc.bytes + 1; /* software bch library is used for locating errors */ nand_chip->ecc.priv = nand_bch_init(mtd); if (!nand_chip->ecc.priv) { @@ -2054,6 +2110,8 @@ static int omap_nand_probe(struct platform_device *pdev) nand_chip->ecc.calculate = omap_calculate_ecc_bch; nand_chip->ecc.read_page = omap_read_page_bch; nand_chip->ecc.write_page = omap_write_page_bch; + mtd_set_ooblayout(mtd, &omap_ooblayout_ops); + oobbytes_per_step = nand_chip->ecc.bytes; err = elm_config(info->elm_dev, BCH8_ECC, mtd->writesize / nand_chip->ecc.size, @@ -2061,16 +2119,6 @@ static int omap_nand_probe(struct platform_device *pdev) if (err < 0) goto return_error; - /* define ECC layout */ - ecclayout->eccbytes = nand_chip->ecc.bytes * - (mtd->writesize / - nand_chip->ecc.size); - oob_index = BADBLOCK_MARKER_LENGTH; - for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) - ecclayout->eccpos[i] = oob_index; - /* reserved marker already included in ecclayout->eccbytes */ - ecclayout->oobfree->offset = - ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; break; case OMAP_ECC_BCH16_CODE_HW: @@ -2084,6 +2132,8 @@ static int omap_nand_probe(struct platform_device *pdev) nand_chip->ecc.calculate = omap_calculate_ecc_bch; nand_chip->ecc.read_page = omap_read_page_bch; nand_chip->ecc.write_page = omap_write_page_bch; + mtd_set_ooblayout(mtd, &omap_ooblayout_ops); + oobbytes_per_step = nand_chip->ecc.bytes; err = elm_config(info->elm_dev, BCH16_ECC, mtd->writesize / nand_chip->ecc.size, @@ -2091,16 +2141,6 @@ static int omap_nand_probe(struct platform_device *pdev) if (err < 0) goto return_error; - /* define ECC layout */ - ecclayout->eccbytes = nand_chip->ecc.bytes * - (mtd->writesize / - nand_chip->ecc.size); - oob_index = BADBLOCK_MARKER_LENGTH; - for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) - ecclayout->eccpos[i] = oob_index; - /* reserved marker already included in ecclayout->eccbytes */ - ecclayout->oobfree->offset = - ecclayout->eccpos[ecclayout->eccbytes - 1] + 1; break; default: dev_err(&info->pdev->dev, "invalid or unsupported ECC scheme\n"); @@ -2108,13 +2148,13 @@ static int omap_nand_probe(struct platform_device *pdev) goto return_error; } - /* all OOB bytes from oobfree->offset till end off OOB are free */ - ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset; /* check if NAND device's OOB is enough to store ECC signatures */ - if (mtd->oobsize < (ecclayout->eccbytes + BADBLOCK_MARKER_LENGTH)) { + min_oobbytes += (oobbytes_per_step * + (mtd->writesize / nand_chip->ecc.size)); + if (mtd->oobsize < min_oobbytes) { dev_err(&info->pdev->dev, "not enough OOB bytes required = %d, available=%d\n", - ecclayout->eccbytes, mtd->oobsize); + min_oobbytes, mtd->oobsize); err = -EINVAL; goto return_error; } |