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mtd: nand: implement the default mtd_ooblayout_ops

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Replace the default nand_ecclayout definitions for large and small page
devices with the equivalent mtd_ooblayout_ops.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Boris Brezillon 2016-02-03 19:06:15 +01:00
parent 1bd0b24737
commit 41b207a70d
2 changed files with 99 additions and 52 deletions
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148
drivers/mtd/nand/nand_base.c
View File

@ -47,55 +47,97 @@
#include <linux/mtd/partitions.h>
#include <linux/of_mtd.h>
/* Define default oob placement schemes for large and small page devices */
static struct nand_ecclayout nand_oob_8 = {
.eccbytes = 3,
.eccpos = {0, 1, 2},
.oobfree = {
{.offset = 3,
.length = 2},
{.offset = 6,
.length = 2} }
};
static struct nand_ecclayout nand_oob_16 = {
.eccbytes = 6,
.eccpos = {0, 1, 2, 3, 6, 7},
.oobfree = {
{.offset = 8,
. length = 8} }
};
static struct nand_ecclayout nand_oob_64 = {
.eccbytes = 24,
.eccpos = {
40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55,
56, 57, 58, 59, 60, 61, 62, 63},
.oobfree = {
{.offset = 2,
.length = 38} }
};
static struct nand_ecclayout nand_oob_128 = {
.eccbytes = 48,
.eccpos = {
80, 81, 82, 83, 84, 85, 86, 87,
88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127},
.oobfree = {
{.offset = 2,
.length = 78} }
};
static int nand_get_device(struct mtd_info *mtd, int new_state);
static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
struct mtd_oob_ops *ops);
/* Define default oob placement schemes for large and small page devices */
static int nand_ooblayout_ecc_sp(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct nand_ecc_ctrl *ecc = &chip->ecc;
if (section > 1)
return -ERANGE;
if (!section) {
oobregion->offset = 0;
oobregion->length = 4;
} else {
oobregion->offset = 6;
oobregion->length = ecc->total - 4;
}
return 0;
}
static int nand_ooblayout_free_sp(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
if (section > 1)
return -ERANGE;
if (mtd->oobsize == 16) {
if (section)
return -ERANGE;
oobregion->length = 8;
oobregion->offset = 8;
} else {
oobregion->length = 2;
if (!section)
oobregion->offset = 3;
else
oobregion->offset = 6;
}
return 0;
}
const struct mtd_ooblayout_ops nand_ooblayout_sp_ops = {
.ecc = nand_ooblayout_ecc_sp,
.free = nand_ooblayout_free_sp,
};
EXPORT_SYMBOL_GPL(nand_ooblayout_sp_ops);
static int nand_ooblayout_ecc_lp(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct nand_ecc_ctrl *ecc = &chip->ecc;
if (section)
return -ERANGE;
oobregion->length = ecc->total;
oobregion->offset = mtd->oobsize - oobregion->length;
return 0;
}
static int nand_ooblayout_free_lp(struct mtd_info *mtd, int section,
struct mtd_oob_region *oobregion)
{
struct nand_chip *chip = mtd_to_nand(mtd);
struct nand_ecc_ctrl *ecc = &chip->ecc;
if (section)
return -ERANGE;
oobregion->length = mtd->oobsize - ecc->total - 2;
oobregion->offset = 2;
return 0;
}
const struct mtd_ooblayout_ops nand_ooblayout_lp_ops = {
.ecc = nand_ooblayout_ecc_lp,
.free = nand_ooblayout_free_lp,
};
EXPORT_SYMBOL_GPL(nand_ooblayout_lp_ops);
static int check_offs_len(struct mtd_info *mtd,
loff_t ofs, uint64_t len)
{
@ -4109,22 +4151,25 @@ int nand_scan_tail(struct mtd_info *mtd)
/* Set the internal oob buffer location, just after the page data */
chip->oob_poi = chip->buffers->databuf + mtd->writesize;
/*
* Set the provided ECC layout. If ecc->layout is NULL, the MTD core
* will just leave mtd->ooblayout to NULL, if it's not NULL, it will
* set ->ooblayout to the default ecclayout wrapper.
*/
mtd_set_ecclayout(mtd, ecc->layout);
/*
* If no default placement scheme is given, select an appropriate one.
*/
if (!ecc->layout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
switch (mtd->oobsize) {
case 8:
ecc->layout = &nand_oob_8;
break;
case 16:
ecc->layout = &nand_oob_16;
mtd_set_ooblayout(mtd, &nand_ooblayout_sp_ops);
break;
case 64:
ecc->layout = &nand_oob_64;
break;
case 128:
ecc->layout = &nand_oob_128;
mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops);
break;
default:
WARN(1, "No oob scheme defined for oobsize %d\n",
@ -4285,7 +4330,6 @@ int nand_scan_tail(struct mtd_info *mtd)
ecc->write_oob_raw = ecc->write_oob;
/* propagate ecc info to mtd_info */
mtd_set_ecclayout(mtd, ecc->layout);
mtd->ecc_strength = ecc->strength;
mtd->ecc_step_size = ecc->size;

3
include/linux/mtd/nand.h
View File

@ -748,6 +748,9 @@ struct nand_chip {
void *priv;
};
extern const struct mtd_ooblayout_ops nand_ooblayout_sp_ops;
extern const struct mtd_ooblayout_ops nand_ooblayout_lp_ops;
static inline void nand_set_flash_node(struct nand_chip *chip,
struct device_node *np)
{