mtd: rawnand: rockchip: NFC driver for RK3308, RK2928 and others

This driver supports Rockchip NFC (NAND Flash Controller) found on RK3308,
RK2928, RKPX30, RV1108 and other SOCs. The driver has been tested using
8-bit NAND interface on the ARM based RK3308 platform.

Support Rockchip SoCs and NFC versions:
- PX30 and RK3326(NFCv900).
	ECC: 16/40/60/70 bits/1KB.
	CLOCK: ahb and nfc.
- RK3308 and RV1108(NFCv800).
	ECC: 16 bits/1KB.
	CLOCK: ahb and nfc.
- RK3036 and RK3128(NFCv622).
	ECC: 16/24/40/60 bits/1KB.
	CLOCK: ahb and nfc.
- RK3066, RK3188 and RK2928(NFCv600).
	ECC: 16/24/40/60 bits/1KB.
	CLOCK: ahb.

Supported features:
- Read full page data by DMA.
- Support HW ECC(one step is 1KB).
- Support 2 - 32K page size.
- Support 8 CS(depend on SoCs)

Limitations:
- No support for the ecc step size is 512.
- Untested on some SoCs.
- No support for subpages.
- No support for the builtin randomizer.
- The original bad block mask is not supported. It is recommended to use
  the BBT(bad block table).

Suggested-by: Johan Jonker <jbx6244@gmail.com>
Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20201210002134.5686-3-yifeng.zhao@rock-chips.com

drivers/mtd/nand/raw/Kconfig

@@ -449,6 +449,18 @@ config MTD_NAND_INTEL_LGM
 	  Enables support for NAND Flash chips on Intel's LGM SoC.
 	  NAND flash controller interfaced through the External Bus Unit.
 
+config MTD_NAND_ROCKCHIP
+	tristate "Rockchip NAND controller"
+	depends on ARCH_ROCKCHIP && HAS_IOMEM
+	help
+	  Enables support for NAND controller on Rockchip SoCs.
+	  There are four different versions of NAND FLASH Controllers,
+	  including:
+	    NFC v600: RK2928, RK3066, RK3188
+	    NFC v622: RK3036, RK3128
+	    NFC v800: RK3308, RV1108
+	    NFC v900: PX30, RK3326
+
 comment "Misc"
 
 config MTD_SM_COMMON

drivers/mtd/nand/raw/Makefile

@@ -57,6 +57,7 @@ obj-$(CONFIG_MTD_NAND_MESON)		+= meson_nand.o
 obj-$(CONFIG_MTD_NAND_CADENCE)		+= cadence-nand-controller.o
 obj-$(CONFIG_MTD_NAND_ARASAN)		+= arasan-nand-controller.o
 obj-$(CONFIG_MTD_NAND_INTEL_LGM)	+= intel-nand-controller.o
+obj-$(CONFIG_MTD_NAND_ROCKCHIP)		+= rockchip-nand-controller.o
 
 nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
 nand-objs += nand_onfi.o