}
/*
- * Copies (and truncates, if necessary) data from the larger struct,
- * nand_ecclayout, to the smaller, deprecated layout struct,
- * nand_ecclayout_user. This is necessary only to support the deprecated
- * API ioctl ECCGETLAYOUT while allowing all new functionality to use
- * nand_ecclayout flexibly (i.e. the struct may change size in new
- * releases without requiring major rewrites).
+ * Copies (and truncates, if necessary) OOB layout information to the
+ * deprecated layout struct, nand_ecclayout_user. This is necessary only to
+ * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
+ * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
+ * can describe any kind of OOB layout with almost zero overhead from a
+ * memory usage point of view).
*/
static int shrink_ecclayout(struct mtd_info *mtd,
struct nand_ecclayout_user *to)
}
EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
-/**
- * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation
- * @mtd: MTD device structure
- * @section: ECC section. Depending on the layout you may have all the ECC
- * bytes stored in a single contiguous section, or one section
- * per ECC chunk (and sometime several sections for a single ECC
- * ECC chunk)
- * @oobecc: OOB region struct filled with the appropriate ECC position
- * information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->eccpos information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,
- struct mtd_oob_region *oobecc)
-{
- int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
-
- if (!mtd->ecclayout)
- return -ENOTSUPP;
-
- /*
- * This logic allows us to reuse the ->ecclayout information and
- * expose them as ECC regions (as done for the OOB free regions).
- *
- * TODO: this should be dropped as soon as we get rid of the
- * ->ecclayout field.
- */
- for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
- eccpos = mtd->ecclayout->eccpos[eccbyte];
-
- if (eccbyte < mtd->ecclayout->eccbytes - 1) {
- int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
-
- if (eccpos + 1 == neccpos) {
- length++;
- continue;
- }
- }
-
- if (section == cursection)
- break;
-
- length = 0;
- cursection++;
- }
-
- if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)
- return -ERANGE;
-
- oobecc->length = length + 1;
- oobecc->offset = eccpos - length;
-
- return 0;
-}
-
-/**
- * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation
- * @mtd: MTD device structure
- * @section: Free section. Depending on the layout you may have all the free
- * bytes stored in a single contiguous section, or one section
- * per ECC chunk (and sometime several sections for a single ECC
- * ECC chunk)
- * @oobfree: OOB region struct filled with the appropriate free position
- * information
- *
- * This function is just a wrapper around the mtd->ecclayout field and is
- * here to ease the transition to the mtd_ooblayout_ops approach.
- * All it does is convert the layout->oobfree information into proper oob
- * region definitions.
- *
- * Returns zero on success, a negative error code otherwise.
- */
-static int mtd_ecclayout_free(struct mtd_info *mtd, int section,
- struct mtd_oob_region *oobfree)
-{
- struct nand_ecclayout *layout = mtd->ecclayout;
-
- if (!layout)
- return -ENOTSUPP;
-
- if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||
- !layout->oobfree[section].length)
- return -ERANGE;
-
- oobfree->offset = layout->oobfree[section].offset;
- oobfree->length = layout->oobfree[section].length;
-
- return 0;
-}
-
-static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {
- .ecc = mtd_ecclayout_ecc,
- .free = mtd_ecclayout_free,
-};
-
-/**
- * mtd_set_ecclayout - Attach an ecclayout to an MTD device
- * @mtd: MTD device structure
- * @ecclayout: The ecclayout to attach to the device
- *
- * Returns zero on success, a negative error code otherwise.
- */
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)
-{
- if (!mtd || !ecclayout)
- return;
-
- mtd->ecclayout = ecclayout;
- mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);
-}
-EXPORT_SYMBOL_GPL(mtd_set_ecclayout);
-
/*
* Method to access the protection register area, present in some flash
* devices. The user data is one time programmable but the factory data is read
#define MTD_MAX_OOBFREE_ENTRIES_LARGE 32
#define MTD_MAX_ECCPOS_ENTRIES_LARGE 640
-/*
- * Internal ECC layout control structure. For historical reasons, there is a
- * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained
- * for export to user-space via the ECCGETLAYOUT ioctl.
- * nand_ecclayout should be expandable in the future simply by the above macros.
- *
- * This structure is now deprecated, you should use struct nand_ecclayout_ops
- * to describe your OOB layout.
- */
-struct nand_ecclayout {
- __u32 eccbytes;
- __u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];
- struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
-};
-
/**
* struct mtd_oob_region - oob region definition
* @offset: region offset
const char *name;
int index;
- /* [Deprecated] ECC layout structure pointer - read only! */
- struct nand_ecclayout *ecclayout;
-
/* OOB layout description */
const struct mtd_ooblayout_ops *ooblayout;
int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);
int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);
-void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);
-
static inline void mtd_set_ooblayout(struct mtd_info *mtd,
const struct mtd_ooblayout_ops *ooblayout)
{
projects / deliverable / linux.git / commitdiff
