[U-Boot] [PATCH 1/5] mtd/nand: Add function board_nand_init_tail() for some special NAND controllers

[Shengzhou Liu]

In some NAND controllers there is a size limitation of RAM buffer(2K bytes).
To support large-page NAND chips with greater than 2K pagesize, we need a large
buffer, but we don't know pagesize before calling nand_scan_ident(), for more
flexible and to identify different cases of large-page greater than 2K bytes,
we have a board_nand_init_tail() between nand_scan_ident() and nand_scan_tail().

Signed-off-by: Shengzhou Liu <Shengzhou.Liu at freescale.com>
---
 drivers/mtd/nand/nand.c |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/nand/nand.c b/drivers/mtd/nand/nand.c
index d987f4c..800541e 100644
--- a/drivers/mtd/nand/nand.c
+++ b/drivers/mtd/nand/nand.c
@@ -39,6 +39,14 @@ static ulong base_address[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIS
 static const char default_nand_name[] = "nand";
 static __attribute__((unused)) char dev_name[CONFIG_SYS_MAX_NAND_DEVICE][8];
 
+int __board_nand_init_tail(struct mtd_info *mtd, struct nand_chip *nand)
+{
+	/* Allow for init at tail in controller-specific file for some reason */
+	return 0;
+}
+int board_nand_init_tail(struct mtd_info *mtd, struct nand_chip *nand)
+__attribute__((weak, alias("__board_nand_init_tail")));
+
 static void nand_init_chip(struct mtd_info *mtd, struct nand_chip *nand,
 			   ulong base_addr)
 {
@@ -51,7 +59,16 @@ static void nand_init_chip(struct mtd_info *mtd, struct nand_chip *nand,
 
 	nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
 	if (board_nand_init(nand) == 0) {
-		if (nand_scan(mtd, maxchips) == 0) {
+		if (!nand_scan_ident(mtd, maxchips, NULL)) {
+			if (board_nand_init_tail(mtd, nand)) {
+				mtd->name = NULL;
+				return;
+			}
+
+			if (nand_scan_tail(mtd)) {
+				mtd->name = NULL;
+				return;
+			}
 			if (!mtd->name)
 				mtd->name = (char *)default_nand_name;
 #ifdef CONFIG_NEEDS_MANUAL_RELOC
-- 
1.6.4