spl: dfu: add dfu support in SPL

Traditionally the DFU support is available only
as part 2nd stage boot loader(u-boot) and DFU
is not supported in SPL.

The SPL-DFU feature is useful for boards which
does not have MMC/SD, ethernet boot mechanism
to boot the board and only has USB inteface.

This patch add DFU support in SPL with RAM
memory device support to load and execute u-boot.
And then leverage full functionality DFU in
u-boot to flash boot inital binary images to
factory or bare-metal boards to memory devices
like SPI, eMMC, MMC/SD card using USB interface.

This SPL-DFU support can be enabled through
Menuconfig->Boot Images->Enable SPL-DFU support

Signed-off-by: Ravi Babu <ravibabu@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

Kconfig

@@ -291,6 +291,33 @@ config FIT_IMAGE_POST_PROCESS
 	  injected into the FIT creation (i.e. the blobs would have been pre-
 	  processed before being added to the FIT image).
 
+config SPL_DFU_SUPPORT
+	bool "Enable SPL with DFU to load binaries to memory device"
+	depends on USB
+	help
+	  Currently the SPL does not have capability to load the
+	  binaries or boot images to boot devices like ram,eMMC,SPI,etc.
+	  This feature enables the DFU (Device Firmware Upgarde) in SPL with
+	  RAM memory device support. The ROM code will load and execute
+	  the SPL built with dfu. The user can load binaries (u-boot/kernel) to
+	  selected device partition from host-pc using dfu-utils.
+		This feature will be useful to flash the binaries to factory
+	  or bare-metal boards using USB interface.
+
+choice
+	bool "DFU device selection"
+	depends on SPL_DFU_SUPPORT
+
+config SPL_DFU_RAM
+	bool "RAM device"
+	depends on SPL_DFU_SUPPORT
+	help
+	 select RAM/DDR memory device for loading binary images
+	 (u-boot/kernel) to the selected device partition using
+	 DFU and execute the u-boot/kernel from RAM.
+
+endchoice
+
 config SYS_CLK_FREQ
 	depends on ARC || ARCH_SUNXI
 	int "CPU clock frequency"

common/Makefile

@@ -89,6 +89,7 @@ obj-$(CONFIG_USB_KEYBOARD) += usb_kbd.o
 endif # !CONFIG_SPL_BUILD
 
 ifdef CONFIG_SPL_BUILD
+obj-$(CONFIG_SPL_DFU_SUPPORT) += cli_hush.o
 obj-$(CONFIG_SPL_HASH_SUPPORT) += hash.o
 obj-$(CONFIG_ENV_IS_IN_FLASH) += env_flash.o
 obj-$(CONFIG_SPL_YMODEM_SUPPORT) += xyzModem.o

scripts/Makefile.spl

@@ -66,6 +66,10 @@ endif
 
 libs-$(CONFIG_SPL_LIBDISK_SUPPORT) += disk/
 libs-y += drivers/
+libs-$(CONFIG_SPL_DFU_SUPPORT) += drivers/dfu/
+libs-$(CONFIG_SPL_DFU_SUPPORT) += drivers/usb/gadget/
+libs-$(CONFIG_SPL_DFU_SUPPORT) += drivers/usb/gadget/udc/
+libs-$(CONFIG_SPL_DFU_SUPPORT) += drivers/usb/dwc3/
 libs-y += dts/
 libs-y += fs/
 libs-$(CONFIG_SPL_POST_MEM_SUPPORT) += post/drivers/