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mtd: rawnand: brcmnand: improve hamming oob layout

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The current code generates 8 oob sections:
S1	1-5
ECC	6-8
S2	9-15
S3	16-21
ECC	22-24
S4	25-31
S5	32-37
ECC	38-40
S6	41-47
S7	48-53
ECC	54-56
S8	57-63

Change it by merging continuous sections:
S1	1-5
ECC	6-8
S2	9-21
ECC	22-24
S3	25-37
ECC	38-40
S4	41-53
ECC	54-56
S5	57-63

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20200512075733.745374-3-noltari@gmail.com
This commit is contained in:
Álvaro Fernández Rojas 2020-05-12 09:57:33 +02:00 committed by Miquel Raynal
parent 130bbde480
commit d00358d7a1
1 changed files with 16 additions and 19 deletions
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35
drivers/mtd/nand/raw/brcmnand/brcmnand.c
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@ -1099,33 +1099,30 @@ static int brcmnand_hamming_ooblayout_free(struct mtd_info *mtd, int section,
struct brcmnand_cfg *cfg = &host->hwcfg;
int sas = cfg->spare_area_size << cfg->sector_size_1k;
int sectors = cfg->page_size / (512 << cfg->sector_size_1k);
u32 next;
if (section >= sectors * 2)
if (section > sectors)
return -ERANGE;
oobregion->offset = (section / 2) * sas;
next = (section * sas);
if (section < sectors)
next += 6;
if (section & 1) {
oobregion->offset += 9;
oobregion->length = 7;
if (section) {
oobregion->offset = ((section - 1) * sas) + 9;
} else {
oobregion->length = 6;
/* First sector of each page may have BBI */
if (!section) {
/*
* Small-page NAND use byte 6 for BBI while large-page
* NAND use bytes 0 and 1.
*/
if (cfg->page_size > 512) {
oobregion->offset += 2;
oobregion->length -= 2;
} else {
oobregion->length--;
}
if (cfg->page_size > 512) {
/* Large page NAND uses first 2 bytes for BBI */
oobregion->offset = 2;
} else {
/* Small page NAND uses last byte before ECC for BBI */
oobregion->offset = 0;
next--;
}
}
oobregion->length = next - oobregion->offset;
return 0;
}