[U-Boot] [PATCH v2] Decreases code size of the nand_spl

[Alex Waterman <awaterman@dawning.com>]

This patch decreases the code size of the nand_spl by turning multiple function
pointer dereferences in a single function into a single local function pointer.

Signed-off-by: Alex Waterman <awaterman@dawning.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Stefan Roese <sr@denx.de>
---
This works on my local board but I haven't tested it on anything else since I
do not have access to any other hardware. I did make sure the canyonlands board
still builds.

 nand_spl/nand_boot.c |   50 ++++++++++++++++++++++++++++----------------------
 1 files changed, 28 insertions(+), 22 deletions(-)

diff --git a/nand_spl/nand_boot.c b/nand_spl/nand_boot.c
index 4a96878..dd7f3b2 100644
--- a/nand_spl/nand_boot.c
+++ b/nand_spl/nand_boot.c
@@ -35,34 +35,37 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8
 {
 	struct nand_chip *this = mtd->priv;
 	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
+	void (*cmd_ctrl)(struct mtd_info *mtd, int cmd,
+			unsigned int ctrl) = this->cmd_ctrl;
+	int (*dev_ready)(struct mtd_info *mtd) = this->dev_ready;
 
-	if (this->dev_ready)
-		while (!this->dev_ready(mtd))
+	if (dev_ready != NULL)
+		while (!dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;
 
 	/* Begin command latch cycle */
-	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+	cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 	/* Set ALE and clear CLE to start address cycle */
 	/* Column address */
-	this->cmd_ctrl(mtd, offs, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
-	this->cmd_ctrl(mtd, page_addr & 0xff, NAND_CTRL_ALE); /* A[16:9] */
-	this->cmd_ctrl(mtd, (page_addr >> 8) & 0xff,
+	cmd_ctrl(mtd, offs, NAND_CTRL_ALE | NAND_CTRL_CHANGE);
+	cmd_ctrl(mtd, page_addr & 0xff, NAND_CTRL_ALE); /* A[16:9] */
+	cmd_ctrl(mtd, (page_addr >> 8) & 0xff,
 		       NAND_CTRL_ALE); /* A[24:17] */
 #ifdef CONFIG_SYS_NAND_4_ADDR_CYCLE
 	/* One more address cycle for devices > 32MiB */
-	this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
+	cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
 		       NAND_CTRL_ALE); /* A[28:25] */
 #endif
 	/* Latch in address */
-	this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
+	cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
 
 	/*
 	 * Wait a while for the data to be ready
 	 */
-	if (this->dev_ready)
-		while (!this->dev_ready(mtd))
+	if (dev_ready != NULL)
+		while (!dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;
@@ -77,9 +80,12 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8
 {
 	struct nand_chip *this = mtd->priv;
 	int page_addr = page + block * CONFIG_SYS_NAND_PAGE_COUNT;
+	void (*cmd_ctrl)(struct mtd_info *mtd, int cmd,
+			unsigned int ctrl) = this->cmd_ctrl;
+	int (*dev_ready)(struct mtd_info *mtd) = this->dev_ready;
 
-	if (this->dev_ready)
-		while (!this->dev_ready(mtd))
+	if (dev_ready != NULL)
+		while (!dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;
@@ -95,31 +101,31 @@ static int nand_command(struct mtd_info *mtd, int block, int page, int offs, u8
 		offs >>= 1;
 
 	/* Begin command latch cycle */
-	this->cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
+	cmd_ctrl(mtd, cmd, NAND_CTRL_CLE | NAND_CTRL_CHANGE);
 	/* Set ALE and clear CLE to start address cycle */
 	/* Column address */
-	this->cmd_ctrl(mtd, offs & 0xff,
+	cmd_ctrl(mtd, offs & 0xff,
 		       NAND_CTRL_ALE | NAND_CTRL_CHANGE); /* A[7:0] */
-	this->cmd_ctrl(mtd, (offs >> 8) & 0xff, NAND_CTRL_ALE); /* A[11:9] */
+	cmd_ctrl(mtd, (offs >> 8) & 0xff, NAND_CTRL_ALE); /* A[11:9] */
 	/* Row address */
-	this->cmd_ctrl(mtd, (page_addr & 0xff), NAND_CTRL_ALE); /* A[19:12] */
-	this->cmd_ctrl(mtd, ((page_addr >> 8) & 0xff),
+	cmd_ctrl(mtd, (page_addr & 0xff), NAND_CTRL_ALE); /* A[19:12] */
+	cmd_ctrl(mtd, ((page_addr >> 8) & 0xff),
 		       NAND_CTRL_ALE); /* A[27:20] */
 #ifdef CONFIG_SYS_NAND_5_ADDR_CYCLE
 	/* One more address cycle for devices > 128MiB */
-	this->cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
+	cmd_ctrl(mtd, (page_addr >> 16) & 0x0f,
 		       NAND_CTRL_ALE); /* A[31:28] */
 #endif
 	/* Latch in address */
-	this->cmd_ctrl(mtd, NAND_CMD_READSTART,
+	cmd_ctrl(mtd, NAND_CMD_READSTART,
 		       NAND_CTRL_CLE | NAND_CTRL_CHANGE);
-	this->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
+	cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
 
 	/*
 	 * Wait a while for the data to be ready
 	 */
-	if (this->dev_ready)
-		while (!this->dev_ready(mtd))
+	if (dev_ready != NULL)
+		while (!dev_ready(mtd))
 			;
 	else
 		CONFIG_SYS_NAND_READ_DELAY;
-- 
1.7.4.4