[MTD] TXx9 SoC NAND Flash Memory Controller driver

This patch adds support for the integrated NAND flash controller of the
TXx9 family.

Once upon a time there were tx4925ndfmc and tx4938ndfmc driver.  They
were removed due to bitrot in 2005.
This new driver is completely rewritten based on a driver in CELF patch
archive.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Ralf Bächle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/nand/Kconfig

@@ -434,4 +434,10 @@ config MTD_NAND_DAVINCI
 	  Enable the driver for NAND flash chips on Texas Instruments
 	  DaVinci processors.
 
+config MTD_NAND_TXX9NDFMC
+	tristate "NAND Flash support for TXx9 SoC"
+	depends on SOC_TX4938 || SOC_TX4939
+	help
+	  This enables the NAND flash controller on the TXx9 SoCs.
+
 endif # MTD_NAND

drivers/mtd/nand/Makefile

@@ -37,5 +37,6 @@ obj-$(CONFIG_MTD_NAND_FSL_ELBC)		+= fsl_elbc_nand.o
 obj-$(CONFIG_MTD_NAND_FSL_UPM)		+= fsl_upm.o
 obj-$(CONFIG_MTD_NAND_SH_FLCTL)		+= sh_flctl.o
 obj-$(CONFIG_MTD_NAND_MXC)		+= mxc_nand.o
+obj-$(CONFIG_MTD_NAND_TXX9NDFMC)	+= txx9ndfmc.o
 
 nand-objs := nand_base.o nand_bbt.o