[PATCH 1/9] drivers:nand:mtd: add support for UBI bakvol in mtd layer

[Bean Huo 霍斌斌 (beanhuo)]

Add support for UBI bakvol in mtd layer.

This solution based on MLC NAND dual plane program.
so add hook in mtd layer.

Signed-off-by: Bean Huo <beanhuo at micron.com>
---
 include/linux/mtd/mtd.h  | 19 +++++++++++++++++++
 include/linux/mtd/nand.h |  4 ++++
 include/linux/mtd/ubi.h  |  9 +++++++++
 3 files changed, 32 insertions(+)

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index f17fa75..cfcb3a68 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -204,6 +204,9 @@ struct mtd_info {
 			  struct mtd_oob_ops *ops);
 	int (*_write_oob) (struct mtd_info *mtd, loff_t to,
 			   struct mtd_oob_ops *ops);
+	int (*_dual_plane_write_oob) (struct mtd_info *mtd, loff_t to_plane0,
+			struct mtd_oob_ops *ops_plane0, loff_t to_plane1,
+					struct mtd_oob_ops *ops_plane1);
 	int (*_get_fact_prot_info) (struct mtd_info *mtd, size_t len,
 				    size_t *retlen, struct otp_info *buf);
 	int (*_read_fact_prot_reg) (struct mtd_info *mtd, loff_t from,
@@ -280,6 +283,22 @@ static inline int mtd_write_oob(struct mtd_info *mtd, loff_t to,
 	return mtd->_write_oob(mtd, to, ops);
 }
 
+static inline int mtd_write_dual_plane_oob(struct mtd_info *mtd,
+		loff_t to_plane0, struct mtd_oob_ops *ops0, loff_t to_plane1,
+						struct mtd_oob_ops *ops1)
+{
+	ops0->retlen = ops0->oobretlen = 0;
+	ops1->retlen = ops1->oobretlen = 0;
+
+	if (!mtd->_dual_plane_write_oob)
+		return -EOPNOTSUPP;
+	if (!(mtd->flags & MTD_WRITEABLE))
+		return -EROFS;
+
+	return mtd->_dual_plane_write_oob(mtd, to_plane0, ops0,
+						to_plane1, ops1);
+}
+
 int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
 			   struct otp_info *buf);
 int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 272f429..4c5be01 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -77,6 +77,7 @@ extern int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
 #define NAND_CMD_READ1		1
 #define NAND_CMD_RNDOUT		5
 #define NAND_CMD_PAGEPROG	0x10
+#define NAND_CMD_MULTI_PAGEPROG	0x11
 #define NAND_CMD_READOOB	0x50
 #define NAND_CMD_ERASE1		0x60
 #define NAND_CMD_STATUS		0x70
@@ -671,6 +672,9 @@ struct nand_chip {
 	int (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
 			uint32_t offset, int data_len, const uint8_t *buf,
 			int oob_required, int page, int cached, int raw);
+	int (*write_plane_page)(struct mtd_info *mtd, struct nand_chip *chip,
+			uint32_t offset, int data_len, const uint8_t *buf,
+			int oob_required, int page, int plane, int raw);
 	int (*onfi_set_features)(struct mtd_info *mtd, struct nand_chip *chip,
 			int feature_addr, uint8_t *subfeature_para);
 	int (*onfi_get_features)(struct mtd_info *mtd, struct nand_chip *chip,
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 1e271cb..1da3418 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -35,6 +35,15 @@
  */
 #define UBI_MAX_SG_COUNT 64
 
+enum {
+	UBI_BAKVOL_UNONE,
+	UBI_BAKVOL_INIT_INFO,
+	UBI_BAKVOL_INIT_INFO_DONE,
+	UBI_BAKVOL_INIT_VOLUME,
+	UBI_BAKVOL_INIT_VOLUME_DONE,
+	UBI_BAKVOL_RUN
+};
+
 /*
  * enum ubi_open_mode - UBI volume open mode constants.
  *
-- 
1.9.1