[PATCH v4 3/9] mtd: nand: add more helpers in nand.h

Peter Pan
2017-03-23T09:32:40Z

This commit adds some helpers in nand.h
nand_size()
nand_check_address()
nand_check_oob_ops()
nand_oob_ops_across_page()
nand_check_erase_ops()

Signed-off-by: Peter Pan <peterpandong@micron.com>
---
include/linux/mtd/nand.h | 62 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)

diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 54ded4c..0c52401 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -434,6 +434,68 @@ static inline int nand_neraseblocks(struct nand_device *nand)
}

/**
+ * nand_size - Get NAND size
+ * @nand: NAND device
+ *
+ * Returns the total size exposed by @nand.
+ */
+static inline u64 nand_size(struct nand_device *nand)
+{
+ return nand->memorg.ndies * nand->memorg.diesize;
+}
+
+static inline int nand_check_address(struct nand_device *nand, loff_t addr)
+{
+ return addr < nand_size(nand) ? 0 : -EINVAL;
+}
+
+static inline int nand_check_oob_ops(struct nand_device *nand, loff_t start,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ int ooblen = ops->mode == MTD_OPS_AUTO_OOB ?
+ mtd->oobavail : mtd->oobsize;
+
+ if ((!!ops->datbuf != !!ops->len) ||
+ (!!ops->oobbuf != !!ops->ooblen))
+ return -EINVAL;
+ if (ops->ooboffs >= ooblen)
+ return -EINVAL;
+ if (ops->ooboffs + ops->ooblen >
+ (nand_len_to_pages(nand, nand_size(nand)) -
+ nand_offs_to_page(nand, start)) * ooblen)
+ return -EINVAL;
+
+ return 0;
+}
+
+static inline bool nand_oob_ops_across_page(struct nand_device *nand,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ int ooblen = ops->mode == MTD_OPS_AUTO_OOB ?
+ mtd->oobavail : mtd->oobsize;
+
+ return (ops->ooboffs + ops->ooblen) > ooblen;
+}
+
+static inline int nand_check_erase_ops(struct nand_device *nand,
+ struct erase_info *einfo)
+{
+ /* check address align on block boundary */
+ if (einfo->addr & (nand_eraseblock_size(nand) - 1))
+ return -EINVAL;
+ /* check lendth align on block boundary */
+ if (einfo->len & (nand_eraseblock_size(nand) - 1))
+ return -EINVAL;
+ /* Do not allow erase past end of device */
+ if ((einfo->addr + einfo->len) > nand_size(nand))
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
* nand_register - Register a NAND device
* @nand: NAND device
*
--
1.9.1