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mtd: nand: diskonchip: switch to mtd_ooblayout_ops

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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>
This commit is contained in:
Boris Brezillon 2016-02-03 20:00:23 +01:00
parent 14fad62b68
commit 68c1b75482
1 changed files with 45 additions and 15 deletions
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60
drivers/mtd/nand/diskonchip.c
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@ -950,20 +950,50 @@ static int doc200x_correct_data(struct mtd_info *mtd, u_char *dat,
//u_char mydatabuf[528];
/* The strange out-of-order .oobfree list below is a (possibly unneeded)
* attempt to retain compatibility. It used to read:
* .oobfree = { {8, 8} }
* Since that leaves two bytes unusable, it was changed. But the following
* scheme might affect existing jffs2 installs by moving the cleanmarker:
* .oobfree = { {6, 10} }
* jffs2 seems to handle the above gracefully, but the current scheme seems
* safer. The only problem with it is that any code that parses oobfree must
* be able to handle out-of-order segments.
*/
static struct nand_ecclayout doc200x_oobinfo = {
.eccbytes = 6,
.eccpos = {0, 1, 2, 3, 4, 5},
.oobfree = {{8, 8}, {6, 2}}
static int doc200x_ooblayout_ecc(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
if (section)
return -ERANGE;
oobregion->offset = 0;
oobregion->length = 6;
return 0;
}
static int doc200x_ooblayout_free(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
if (section > 1)
return -ERANGE;
/*
* The strange out-of-order free bytes definition is a (possibly
* unneeded) attempt to retain compatibility. It used to read:
* .oobfree = { {8, 8} }
* Since that leaves two bytes unusable, it was changed. But the
* following scheme might affect existing jffs2 installs by moving the
* cleanmarker:
* .oobfree = { {6, 10} }
* jffs2 seems to handle the above gracefully, but the current scheme
* seems safer. The only problem with it is that any code retrieving
* free bytes position must be able to handle out-of-order segments.
*/
if (!section) {
oobregion->offset = 8;
oobregion->length = 8;
} else {
oobregion->offset = 6;
oobregion->length = 2;
}
return 0;
}
static const struct mtd_ooblayout_ops doc200x_ooblayout_ops = {
.ecc = doc200x_ooblayout_ecc,
.free = doc200x_ooblayout_free,
};
/* Find the (I)NFTL Media Header, and optionally also the mirror media header.
@ -1537,6 +1567,7 @@ static int __init doc_probe(unsigned long physadr)
nand->bbt_md = nand->bbt_td + 1;
mtd->owner = THIS_MODULE;
mtd_set_ooblayout(mtd, &doc200x_ooblayout_ops);
nand_set_controller_data(nand, doc);
nand->select_chip = doc200x_select_chip;
@ -1548,7 +1579,6 @@ static int __init doc_probe(unsigned long physadr)
nand->ecc.calculate = doc200x_calculate_ecc;
nand->ecc.correct = doc200x_correct_data;
nand->ecc.layout = &doc200x_oobinfo;
nand->ecc.mode = NAND_ECC_HW_SYNDROME;
nand->ecc.size = 512;
nand->ecc.bytes = 6;