# 
# Copyright (C) 2012-2015 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
include $(INCLUDE_DIR)/image.mk
include $(INCLUDE_DIR)/host.mk

FAT32_BLOCK_SIZE=1024
FAT32_BLOCKS=$(shell echo $$(($(CONFIG_BRCM2708_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))

ifneq ($(CONFIG_TARGET_IMAGES_GZIP),)
  define Image/gzip
    gzip -9n -c $(1) > $(1).gz
    mv $(1).gz $(BIN_DIR)
  endef
else
  define Image/gzip
  endef
endif

define Image/Prepare
	rm -rf $(KDIR)/overlays
	mkdir -p $(KDIR)/overlays
	$(CP) $(DTS_DIR)/overlays/*.dtb $(KDIR)/overlays/
endef

### Image scripts ###
define Build/gen-cfg
	cat config.txt > $@.config
	echo -e "\ndevice_tree=$(DEVICE_DTS).dtb" >> $@.config
endef

define Build/boot-img
	rm -f $@.boot
	mkfs.fat -C $@.boot $(FAT32_BLOCKS)
	mcopy -i $@.boot $(KDIR)/bootcode.bin ::
	mcopy -i $@.boot $(KDIR)/COPYING.linux ::
	mcopy -i $@.boot $(KDIR)/LICENCE.broadcom ::
	mcopy -i $@.boot $(KDIR)/start.elf ::
	mcopy -i $@.boot $(KDIR)/start_cd.elf ::
	mcopy -i $@.boot $(KDIR)/fixup.dat ::
	mcopy -i $@.boot $(KDIR)/fixup_cd.dat ::
	mcopy -i $@.boot cmdline.txt ::
	mcopy -i $@.boot $@.config ::config.txt
	mcopy -i $@.boot $(word 1,$^) ::kernel.img
	mcopy -i $@.boot $(DTS_DIR)/$(DEVICE_DTS).dtb ::$(DEVICE_DTS).dtb
	mcopy -s -i $@.boot $(KDIR)/overlays ::
endef

define Build/sdcard-img
	./gen_rpi_sdcard_img.sh $@ $@.boot $(word 2,$^) \
		$(CONFIG_BRCM2708_SD_BOOT_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
	$(call Image/gzip,$@)
endef

### Device macros ###
define Device/Default
  FILESYSTEMS := ext4
  PROFILES = Default $$(DEVICE_PROFILE)
  KERNEL := kernel-bin
  IMAGES := sdcard.bin
  IMAGE/sdcard.bin := gen-cfg | boot-img | sdcard-img
  DEVICE_PROFILE :=
  DEVICE_DTS :=
endef
DEVICE_VARS += DEVICE_PROFILE DEVICE_DTS

# $(1) = profile
# $(2) = image name
# $(3) = dts
define add_bcm2708
  define Device/$(2)
    DEVICE_PROFILE := $(1)
    DEVICE_DTS := $(3)
  endef
  TARGET_DEVICES += $(2)
endef

### BCM2708/BCM2835 ###
ifeq ($(SUBTARGET),bcm2708)
  # Raspberry Pi Model B
  $(eval $(call add_bcm2708,RaspberryPi_B,rpi-b,bcm2708-rpi-b))
  # Raspberry Pi Model B+
  $(eval $(call add_bcm2708,RaspberryPi_BPlus,rpi-b-plus,bcm2708-rpi-b-plus))
  # Raspberry Pi Compute Module
  $(eval $(call add_bcm2708,RaspberryPi_CM,rpi-cm,bcm2708-rpi-cm))
endif

### BCM2709/BCM2836 ###
ifeq ($(SUBTARGET),bcm2709)
  # Raspberry Pi 2 Model B
  $(eval $(call add_bcm2708,RaspberryPi_2,rpi-2-b,bcm2709-rpi-2-b))
endif

$(eval $(call BuildImage))