sunxi: nand: Add board configuration options

When SPL_NAND_SUNXI option is selected in config, set some configuration
options for sunxi NAND.

This commit also introduces the configurable options in Kconfig.

Signed-off-by: Peter Gielda <pgielda@antmicro.com>
Signed-off-by: Tomasz Gorochowik <tgorochowik@antmicro.com>
Signed-off-by: Mateusz Holenko <mholenko@antmicro.com>
Signed-off-by: Piotr Zierhoffer <pzierhoffer@antmicro.com>
Signed-off-by: Karol Gugala <kgugala@antmicro.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/mtd/nand/Kconfig

@@ -85,6 +85,46 @@ config SPL_NAND_DENALI
 	  This is a small implementation of the Denali NAND controller
 	  for use on SPL.
 
+config SPL_NAND_SUNXI
+	bool "Support for NAND on Allwinner A20 in SPL"
+	depends on MACH_SUN7I
+	---help---
+	Enable support for NAND. This option allows SPL to read from
+	sunxi NAND using DMA transfers.
+	Depending on the NAND chip, values like ECC strength and page sizes
+	have to be configured.
+
+config NAND_SUNXI_SPL_SYNDROME_PARTITIONS_END
+	hex "Size of syndrome partitions in sunxi NAND"
+	default 0x400000
+	depends on SPL_NAND_SUNXI
+	---help---
+	End address for boot partitions on NAND. Those partitions have a
+	different random seed that has to match the sunxi BROM setting.
+
+config NAND_SUNXI_SPL_ECC_STRENGTH
+	int "ECC Strength for sunxi NAND"
+	default 40
+	depends on SPL_NAND_SUNXI
+	---help---
+	ECC strength used by the sunxi NAND SPL driver. This is specific to the
+	chosen NAND chip and has to match the value used by the sunxi BROM.
+
+config NAND_SUNXI_SPL_ECC_PAGE_SIZE
+	hex "ECC page size for sunxi NAND"
+	default 0x400
+	depends on SPL_NAND_SUNXI
+	---help---
+	ECC page size used by the sunxi NAND SPL driver for syndrome partitions.
+	This setting has to match the value used by the sunxi BROM.
+
+config NAND_SUNXI_SPL_PAGE_SIZE
+	hex "Page size for sunxi NAND"
+	default 0x2000
+	depends on SPL_NAND_SUNXI
+	---help---
+	Page size of the NAND flash used by the sunxi NAND SPL driver. This is
+	specific to the chosen NAND chip.
 endif
 
 endmenu

include/configs/sunxi-common.h

@@ -139,6 +139,16 @@
 #define CONFIG_INITRD_TAG
 #define CONFIG_SERIAL_TAG
 
+#if defined(CONFIG_SPL_NAND_SUNXI)
+#define CONFIG_SPL_NAND_DRIVERS
+#define CONFIG_SPL_NAND_SUPPORT
+
+#define CONFIG_SYS_NAND_SPL_KERNEL_OFFS 0x280000
+#define CONFIG_SYS_NAND_U_BOOT_OFFS 0x008000
+
+#endif
+
+
 /* mmc config */
 #if !defined(CONFIG_UART0_PORT_F)
 #define CONFIG_MMC