USE_LLVM	:= 1
CROSS_GCC	:= arm-none-eabi-
ifeq ($(USE_LLVM),1)
	COMPILER	:= LLVM=1
else
	COMPILER	:= CROSS_COMPILE=$(CROSS_GCC)
endif
#CROSS_COMPILE	?= armv4l-
CROSS_COMPILE	?= arm-linux-gnueabihf-
PATCHDIR	:= ${HOME}/linux-stericsson
build_dir       := $(CURDIR)/build-$(MACHINE)
output_dir	:= $(HOME)
rootfs		:= $(HOME)/rootfs-h3600.cpio
rootfsbase	:= $(shell basename $(rootfs))
install_dir     := $(build_dir)/install
config_file     := $(build_dir)/.config
strip		:= $(CROSS_COMPILE)strip
objcopy		:= $(CROSS_COMPILE)objcopy
makejobs	:= $(shell grep '^processor' /proc/cpuinfo | sort -u | wc -l)
makethreads	:= $(shell dc -e "$(makejobs) 1 + p")

make_parallel	:= -j$(makethreads) -l$(makejobs)
make_options := -f Makefile \
                ARCH=arm \
		$(make_parallel) \
                $(COMPILER) \
                KBUILD_OUTPUT=$(build_dir)

.PHONY: help
help:
	@echo "****  Common Makefile  ****"
	@echo "make config - configure the kernel"
	@echo "make build - build the kernel and produce a RAMdisk image"
	@echo
	@echo "example:"
	@echo "make -f $(MACHINE).mak config"
	@echo "make -f $(MACHINE).mak build"

.PHONY: have-rootfs
have-rootfs:
	@if [ ! -f $(rootfs) ] ; then \
	     echo "ERROR: no rootfs at $(rootfs)" ; \
	     echo "This is needed to boot the system." ; \
	     echo "ABORTING." ; \
	     exit 1 ; \
	else \
	     echo "Rootfs available at $(rootfs)" ; \
	fi

.PHONY: have-crosscompiler
have-crosscompiler:
	@if [ $(USE_LLVM) -eq 1 ] ; then \
	   echo "LLVM OK" ; \
	else \
	   echo -n "Check that $(CROSS_COMPILE)gcc is available..." ; \
	   which $(CROSS_COMPILE)gcc > /dev/null ; \
	   if [ ! $$? -eq 0 ] ; then \
	      echo "ERROR: cross-compiler $(CROSS_COMPILE)gcc not in PATH=$$PATH!" ; \
	      echo "ABORTING." ; \
	      exit 1 ; \
	   else \
	      echo "OK" ;\
	   fi \
	fi

config-base: FORCE
	@mkdir -p $(build_dir)
	$(MAKE) $(make_options) h3600_defconfig

config-initramfs: config-base FORCE
	@cp $(rootfs) $(build_dir)/$(rootfsbase)
	# Configure in the initramfs
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable BLK_DEV_INITRD \
	--set-str INITRAMFS_SOURCE $(rootfsbase) \
	--enable RD_GZIP \
	--enable INITRAMFS_COMPRESSION_GZIP

config-earlydebug: config-base FORCE
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable DEBUG_KERNEL \
	--enable DEBUG_LL \
	--enable EARLY_PRINTK \
	--set-str CMDLINE "earlyprintk"

config-kasan: config-base FORCE
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable KASAN \
	--enable KASAN_OUTLINE \
	--enable STACKTRACE \
	--enable SLUB_DEBUG_ON \
	--enable TEST_KASAN

config-cfi: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable CFI_CLANG \
	--enable CFI_PERMISSIVE \
	--enable LKDTM

config-mainlined-features: config-base FORCE
	# Then reconfigure various stuff
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable PREEMPT \
	--enable NO_HZ_IDLE \
	--enable IRDA \
	--enable DEVTMPFS \
	--enable FRAMEBUFFER_CONSOLE \
	--enable LOGO \
	--enable DMADEVICES \
	--enable DMA_SA11X0 \
	--enable DMATEST \
	--enable DEBUG_FS

# --enable FRAMEBUFFER_CONSOLE_ROTATION

# Russell's patch stack
config-russell: config-base FORCE
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable SOUND \
	--enable SND \
	--enable SND_SOC \
	--enable SND_SOC_SA11X0_SSP \
	--enable SND_SA11X0_H3XXX

config-openembedded: config-base FORCE
	# Then reconfigure various stuff
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable KEYBOARD_IPAQ_MICRO \
	--enable INPUT_EVDEV \
	--enable INPUT_TOUCHSCREEN \
	--enable TOUCHSCREEN_IPAQ_MICRO \
	--enable POWER_SUPPLY \
	--enable BATTERY_IPAQ_MICRO \
	--enable NEW_LEDS \
	--enable LEDS_CLASS \
	--enable-after LEDS_CLASS LEDS_TRIGGERS \
	--enable-after LEDS_TRIGGERS LEDS_TRIGGER_HEARTBEAT \
	--enable-after LEDS_CLASS LEDS_IPAQ_MICRO \
	--enable BACKLIGHT_LCD_SUPPORT \
	--enable BACKLIGHT_CLASS_DEVICE \
	--enable BACKLIGHT_IPAQ_MICRO \
	--enable JFFS2_SUMMARY \
	--enable JFFS2_COMPRESSION_OPTIONS \
	--enable JFFS2_LZO \
	--enable AEABI \
	--enable OABI_COMPAT

config: have-rootfs config-base config-mainlined-features config-initramfs config-cfi FORCE
	$(CURDIR)/scripts/config --file $(config_file) \
	--set-str CMDLINE "console=ttySA0,115200n8 console=tty0" \
	--disable CMDLINE_FROM_BOOTLOADER \
	--disable CMDLINE_EXTEND \
	--enable CMDLINE_FORCE \
	--enable KEYBOARD_IPAQ_MICRO \
	--enable INPUT_EVDEV \
	--enable INPUT_TOUCHSCREEN \
	--enable TOUCHSCREEN_IPAQ_MICRO \
	--enable POWER_SUPPLY \
	--enable BATTERY_IPAQ_MICRO \
	--enable NEW_LEDS \
	--enable LEDS_CLASS \
	--enable-after LEDS_CLASS LEDS_TRIGGERS \
	--enable-after LEDS_TRIGGERS LEDS_TRIGGER_HEARTBEAT \
	--enable-after LEDS_CLASS LEDS_IPAQ_MICRO \
	--enable BACKLIGHT_LCD_SUPPORT \
	--enable BACKLIGHT_CLASS_DEVICE \
	--enable BACKLIGHT_IPAQ_MICRO \
	--enable JFFS2_SUMMARY \
	--enable JFFS2_COMPRESSION_OPTIONS \
	--enable JFFS2_LZO \
	--enable AEABI \
	--enable OABI_COMPAT \
	--enable SA1100_H3800
	yes "" | make $(make_options) oldconfig

# Russell is skeptic about these.
#	--enable AEABI
#	--enable OABI_COMPAT

menuconfig: FORCE
	if [ ! -d $(build_dir) ] ; then \
	   echo "no build dir" ; \
	   exit 1 ; \
        fi
	$(MAKE) $(make_options) menuconfig
	$(MAKE) $(make_options) savedefconfig

saveconfig: config-base config-mainlined-features config-openembedded FORCE
	yes "" | make $(make_options) oldconfig
	$(MAKE) $(make_options) savedefconfig
	cp $(build_dir)/defconfig arch/arm/configs/$(MACHINE)_defconfig

build-zimage: have-crosscompiler FORCE
	$(MAKE) $(make_options) zImage $(make_flags)

build: have-rootfs have-crosscompiler build-zimage FORCE
	@echo "Copy zImage to $(output_dir)/zImage"
	@cp -f $(build_dir)/arch/arm/boot/zImage $(output_dir)/zImage

headers: have-rootfs have-crosscompiler build-zimage FORCE
	$(MAKE) $(make_options) headers_install INSTALL_HDR_PATH=/tmp

clean:
	$(MAKE) -f Makefile clean
	rm -rf $(build_dir)

# Rules without commands or prerequisites that do not match a file name
# are considered to always change when make runs. This means that any rule
# that depends on FORCE will always be remade also.
FORCE: