[OpenWrt-Devel] [PATCH] [ramips] mt7621: fix nand driver

[YounJaeRho]

This patch fix mt7621 nand driver for linux-3.18 kernel.mt7621 share PIN between NAND,SDXC,SPI.so you should pinctrl in dts file that only one of them is used at a time.
SQUASH supportJFFS2 support (no hardware ECC support which is disabled by `CONFIG_TARGET_ROOTFS_JFFS2` )

Signed-off-by: YounJae Rho <luxflow at live.com>------ a/drivers/mtd/nand/mtk_nand.c
+++ b/drivers/mtd/nand/mtk_nand.c
@@ -42,6 +42,9 @@
 #include "bmt.h"
 #include "partition.h"
 
+#define NAND_MAX_OOBSIZE	640
+#define NAND_MAX_PAGESIZE	8192
+
 unsigned int CFG_BLOCKSIZE;
 
 static int shift_on_bbt = 0;
@@ -1422,9 +1425,7 @@ mtk_nand_erase_hw(struct mtd_info *mtd,
 {
 	struct nand_chip *chip = (struct nand_chip *)mtd->priv;
 
-	chip->erase_cmd(mtd, page);
-
-	return chip->waitfunc(mtd, chip);
+	return chip->erase(mtd, chip);
 }
 
 static int
@@ -2092,7 +2093,11 @@ mtk_nand_probe(struct platform_device *p
 
 	// For BMT, we need to revise driver architecture
 	nand_chip->write_page = mtk_nand_write_page;
+	#if defined(CONFIG_TARGET_ROOTFS_JFFS2)
+	nand_chip->ecc.write_oob = NULL;
+	#else
 	nand_chip->ecc.write_oob = mtk_nand_write_oob;
+	#endif
 	nand_chip->block_markbad = mtk_nand_block_markbad;   // need to add nand_get_device()/nand_release_device().
 	//	nand_chip->erase = mtk_nand_erase;	
 	//    nand_chip->read_page = mtk_nand_read_page;
@@ -2175,7 +2180,7 @@ mtk_nand_probe(struct platform_device *p
 	nand_chip->pagemask = (nand_chip->chipsize >> nand_chip->page_shift) - 1;
 	nand_chip->phys_erase_shift = ffs(mtd->erasesize) - 1;
 	nand_chip->chip_shift = ffs(nand_chip->chipsize) - 1;//0x1C;//ffs(nand_chip->chipsize) - 1;
-	nand_chip->oob_poi = nand_chip->buffers->databuf + mtd->writesize;
+	nand_chip->oob_poi = NULL;
 	nand_chip->badblockpos = 0;
 
 	if (devinfo.pagesize == 4096)
 		 	   		   		 	   		   		 	   		  
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