arm: mvebu: helios4: Enable SPI flash support

Enable SPI flash support under U-Boot and SPL. The ENV size and offset,
ported from U-Boot 2013.01 Marvell version: 2015_T1.0p16

To create U-Boot image for SPI flash, user would need to replace
* CONFIG_MVEBU_SPL_BOOT_DEVICE_MMC with CONFIG_MVEBU_SPL_BOOT_DEVICE_SPI
* CONFIG_ENV_IS_IN_MMC with CONFIG_ENV_IS_IN_SPI_FLASH
Signed-off-by: NAditya Prayoga <aditya@kobol.io>
Reviewed-by: NStefan Roese <sr@denx.de>
Tested-By: NDennis Gilmore <dgilmore@redhat.com>
Reviewed-By: NDennis Gilmore <dgilmore@redhat.com>
Signed-off-by: NStefan Roese <sr@denx.de>

arch/arm/dts/armada-388-helios4-u-boot.dtsi

@@ -4,5 +4,15 @@
 	aliases {
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
+		spi1 = &spi1;
 	};
 };
+
+&spi1 {
+	u-boot,dm-spl;
+};
+
+&w25q32 {
+	status = "okay";
+	u-boot,dm-spl;
+};

configs/helios4_defconfig

@@ -6,7 +6,6 @@ CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_TARGET_HELIOS4=y
 CONFIG_MVEBU_SPL_BOOT_DEVICE_MMC=y
-CONFIG_SPL_MMC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL=y

include/configs/helios4.h

@@ -6,6 +6,8 @@
 #ifndef _CONFIG_HELIOS4_H
 #define _CONFIG_HELIOS4_H
 
+#include <linux/sizes.h>
+
 /*
  * High Level Configuration Options (easy to change)
  */
@@ -23,6 +25,9 @@
 
 /* SPI NOR flash default params, used by sf commands */
 #define CONFIG_SF_DEFAULT_BUS		1
+#define CONFIG_SF_DEFAULT_CS		0
+#define CONFIG_SF_DEFAULT_SPEED		104000000
+#define CONFIG_SF_DEFAULT_MODE		SPI_MODE_3
 
 /*
  * SDIO/MMC Card Configuration
@@ -43,6 +48,21 @@
 #define CONFIG_SYS_SCSI_MAX_DEVICE      (CONFIG_SYS_SCSI_MAX_SCSI_ID * \
 					CONFIG_SYS_SCSI_MAX_LUN)
 
+#ifdef CONFIG_MVEBU_SPL_BOOT_DEVICE_SPI
+/*
+ * SPI Flash configuration for the environment access
+ */
+#define CONFIG_ENV_SPI_BUS		CONFIG_SF_DEFAULT_BUS
+#define CONFIG_ENV_SPI_CS		CONFIG_SF_DEFAULT_CS
+#define CONFIG_ENV_SPI_MAX_HZ		CONFIG_SF_DEFAULT_SPEED
+
+/* Environment in SPI NOR flash */
+#define CONFIG_ENV_SECT_SIZE		SZ_64K
+#define CONFIG_ENV_SIZE			CONFIG_ENV_SECT_SIZE
+#define CONFIG_ENV_OFFSET		SZ_1M
+#endif
+
+#ifdef CONFIG_MVEBU_SPL_BOOT_DEVICE_MMC
 /* Environment in MMC */
 #define CONFIG_SYS_MMC_ENV_DEV		0
 #define CONFIG_ENV_SECT_SIZE		0x200
@@ -50,6 +70,7 @@
 /* stay within first 1M */
 #define CONFIG_ENV_OFFSET		(SZ_1M - CONFIG_ENV_SIZE)
 #define CONFIG_ENV_ADDR			CONFIG_ENV_OFFSET
+#endif
 
 #define CONFIG_PHY_MARVELL		/* there is a marvell phy */
 #define PHY_ANEG_TIMEOUT	8000	/* PHY needs a longer aneg time */
@@ -69,7 +90,13 @@
  */
 #define SPL_BOOT_SPI_NOR_FLASH		1
 #define SPL_BOOT_SDIO_MMC_CARD		2
+
+#ifdef CONFIG_MVEBU_SPL_BOOT_DEVICE_SPI
+#define CONFIG_SPL_BOOT_DEVICE		SPL_BOOT_SPI_NOR_FLASH
+#endif
+#ifdef CONFIG_MVEBU_SPL_BOOT_DEVICE_MMC
 #define CONFIG_SPL_BOOT_DEVICE		SPL_BOOT_SDIO_MMC_CARD
+#endif
 
 /* Defines for SPL */
 #define CONFIG_SPL_SIZE			(140 << 10)
@@ -88,12 +115,16 @@
 
 #if CONFIG_SPL_BOOT_DEVICE == SPL_BOOT_SPI_NOR_FLASH
 /* SPL related SPI defines */
+#define CONFIG_SPL_SPI_FLASH_SUPPORT
+#define CONFIG_SPL_SPI_LOAD
+#define CONFIG_SPL_SPI_SUPPORT
 #define CONFIG_SYS_SPI_U_BOOT_OFFS	0x20000
 #define CONFIG_SYS_U_BOOT_OFFS		CONFIG_SYS_SPI_U_BOOT_OFFS
 #endif
 
 #if CONFIG_SPL_BOOT_DEVICE == SPL_BOOT_SDIO_MMC_CARD
 /* SPL related MMC defines */
+#define CONFIG_SPL_MMC_SUPPORT
 #define CONFIG_SYS_MMC_U_BOOT_OFFS		(160 << 10)
 #define CONFIG_SYS_U_BOOT_OFFS			CONFIG_SYS_MMC_U_BOOT_OFFS
 #ifdef CONFIG_SPL_BUILD