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authorBoris Brezillon <boris.brezillon@free-electrons.com>2016-02-03 20:03:04 +0100
committerBoris Brezillon <boris.brezillon@free-electrons.com>2016-05-05 23:51:46 +0200
commite04dbf352820245b54f74200ac97327959f02c56 (patch)
tree8e5194d6c375fd60a0fe77e0e75f73388e6d5884
parenta894cf6c5a82c7ddcb1bad82d1e0af3d0ead9a41 (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>
-rw-r--r--drivers/mtd/nand/omap2.c202
1 files changed, 121 insertions, 81 deletions
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 38fe6b8..55916786d 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;
}