[PATCH v4 02/10] mtd: spinand: Add a NAND page I/O request type

[Mikhail Kshevetskiy]

Use an enum to differentiate the type of I/O (reading or writing a
page). Also update the request iterator.

This is a port of linux patch 701981cab01696584a12e5f0e7c2ad931a326059
created by Miquel Raynal <miquel.raynal at bootlin.com>

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 drivers/mtd/nand/spi/core.c |  4 ++--
 include/linux/mtd/nand.h    | 18 ++++++++++++++++--
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
index 2a7e9c164f5..ca07c70e217 100644
--- a/drivers/mtd/nand/spi/core.c
+++ b/drivers/mtd/nand/spi/core.c
@@ -518,7 +518,7 @@ static int spinand_mtd_read(struct mtd_info *mtd, loff_t from,
 	mutex_lock(&spinand->lock);
 #endif
 
-	nanddev_io_for_each_page(nand, from, ops, &iter) {
+	nanddev_io_for_each_page(nand, NAND_PAGE_READ, from, ops, &iter) {
 		schedule();
 		ret = spinand_select_target(spinand, iter.req.pos.target);
 		if (ret)
@@ -570,7 +570,7 @@ static int spinand_mtd_write(struct mtd_info *mtd, loff_t to,
 	mutex_lock(&spinand->lock);
 #endif
 
-	nanddev_io_for_each_page(nand, to, ops, &iter) {
+	nanddev_io_for_each_page(nand, NAND_PAGE_WRITE, to, ops, &iter) {
 		schedule();
 		ret = spinand_select_target(spinand, iter.req.pos.target);
 		if (ret)
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
index 651f8706df5..0afdaed5715 100644
--- a/include/linux/mtd/nand.h
+++ b/include/linux/mtd/nand.h
@@ -80,8 +80,19 @@ struct nand_pos {
 	unsigned int page;
 };
 
+/**
+ * enum nand_page_io_req_type - Direction of an I/O request
+ * @NAND_PAGE_READ: from the chip, to the controller
+ * @NAND_PAGE_WRITE: from the controller, to the chip
+ */
+enum nand_page_io_req_type {
+	NAND_PAGE_READ = 0,
+	NAND_PAGE_WRITE,
+};
+
 /**
  * struct nand_page_io_req - NAND I/O request object
+ * @type: the type of page I/O: read or write
  * @pos: the position this I/O request is targeting
  * @dataoffs: the offset within the page
  * @datalen: number of data bytes to read from/write to this page
@@ -97,6 +108,7 @@ struct nand_pos {
  * specific commands/operations.
  */
 struct nand_page_io_req {
+	enum nand_page_io_req_type type;
 	struct nand_pos pos;
 	unsigned int dataoffs;
 	unsigned int datalen;
@@ -613,11 +625,13 @@ static inline void nanddev_pos_next_page(struct nand_device *nand,
  * layer.
  */
 static inline void nanddev_io_iter_init(struct nand_device *nand,
+					enum nand_page_io_req_type reqtype,
 					loff_t offs, struct mtd_oob_ops *req,
 					struct nand_io_iter *iter)
 {
 	struct mtd_info *mtd = nanddev_to_mtd(nand);
 
+	iter->req.type = reqtype;
 	iter->req.mode = req->mode;
 	iter->req.dataoffs = nanddev_offs_to_pos(nand, offs, &iter->req.pos);
 	iter->req.ooboffs = req->ooboffs;
@@ -687,8 +701,8 @@ static inline bool nanddev_io_iter_end(struct nand_device *nand,
  *
  * Should be used for iterate over pages that are contained in an MTD request.
  */
-#define nanddev_io_for_each_page(nand, start, req, iter)		\
-	for (nanddev_io_iter_init(nand, start, req, iter);		\
+#define nanddev_io_for_each_page(nand, type, start, req, iter)		\
+	for (nanddev_io_iter_init(nand, type, start, req, iter);	\
 	     !nanddev_io_iter_end(nand, iter);				\
 	     nanddev_io_iter_next_page(nand, iter))
 
-- 
2.39.2