ARCH		:= arm
CROSS_COMPILE	:= arm-linux-gnueabihf-
build_dir       := $(CURDIR)/build-simone
output_dir	:= $(HOME)
modules_out_dir	:= /mnt/simone
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")
tftproot	:= /var/lib/tftpboot

make_options := -f Makefile \
		-j$(makethreads) -l$(makejobs) \
		ARCH=arm \
		CROSS_COMPILE=$(CROSS_COMPILE) \
		KBUILD_OUTPUT=$(build_dir) \
		INSTALL_MOD_PATH=$(modules_out_dir)
make_flags	:= CONFIG_DEBUG_SECTION_MISMATCH=y

.PHONY: help
help:
	@echo "****  Common Makefile  ****"
	@echo "make config - configure for platform \"foo\""
	@echo "make build - build the kernel and produce a RAMdisk image"
	@echo
	@echo "example:"
	@echo "make -f simone.mak config"
	@echo "make -f simone.mak build"

.PHONY: have-crosscompiler
have-crosscompiler:
	@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

config-base: FORCE
	@mkdir -p $(build_dir)
	$(MAKE) $(make_options) ep93xx_defconfig
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable EP93XX_SDCE0_PHYS_OFFSET \
	--enable MACH_SIM_ONE \
	--enable SPI \
	--enable SPI_EP93XX \
	--enable MMC \
	--enable MMC_SPI \
	--enable EXT4_FS \
	--enable DMADEVICES \
	--enable DMA_ENGINE \
	--enable EP93XX_DMA \
	--enable FB \
	--enable FB_EP93XX \
	--enable FB_MODE_HELPERS \
	--enable LOGO \
	--enable I2C \
	--enable I2C_GPIO \
	--enable DEBUG_FS

config-debian: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable DEVTMPFS \
	--enable CGROUPS \
	--enable CGROUP_FREEZER \
	--enable CGROUP_DEVICE \
	--enable CPUSETS \
	--enable PROC_PID_CPUSET \
	--enable CGROUP_CPUACCT \
	--enable RESOURCE_COUNTERS \
	--enable CGROUP_MEM_RES_CTLR \
	--enable CGROUP_MEM_RES_CTLR_DISABLED \
	--enable CGROUP_MEM_RES_CTLR_SWAP \
	--enable CGROUP_SCHED \
	--enable FAIR_GROUP_SCHED \
	--enable BLK_CGROUP \
	--enable NAMESPACES \
	--enable SCHED_AUTOGROUP \
	--enable FHANDLE \
	--enable SWAP \
	--module AUTOFS4_FS

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

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

config-gpiokeys: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable INPUT \
	--enable INPUT_KEYBOARD \
	--enable KEYBOARD_GPIO

config: config-base config-gpiokeys config-earlydebug
	yes "" | make $(make_options) oldconfig

allconfig: config
	make $(make_options) allmodconfig

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

saveconfig: FORCE
	yes "" | make $(make_options) oldconfig
	$(MAKE) $(make_options) savedefconfig
	cp $(build_dir)/defconfig arch/arm/configs/ep93xx_defconfig

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

build-modules: have-crosscompiler FORCE
	$(MAKE) $(make_options) modules $(make_flags)
	$(MAKE) $(make_options) modules_install $(make_flags)

build: have-crosscompiler build-zimage FORCE
	@echo "Copy vmlinux to $(output_dir)/vmlinux"
	@cp -f $(build_dir)/vmlinux $(output_dir)/vmlinux
	@echo "Copy zImage to $(output_dir)/zImage"
	@cp -f $(build_dir)/arch/arm/boot/zImage $(output_dir)/zImage
	@which mkimage > /dev/null ; \
	if [ ! $$? -eq 0 ] ; then \
	   echo "mkimage not in PATH=$$PATH" ; \
	   echo "This tool creates the uImage and comes from the uboot tools" ; \
	   echo "On Ubuntu/Debian sudo apt-get install uboot-mkimage" ; \
	   echo "SKIPPING uImage GENERATION" ; \
	else \
	   mkimage \
		-A arm \
		-O linux \
		-T kernel \
		-C none \
		-a 0xc0008000 \
		-e 0xc0008000 \
		-n "SIM.ONE kernel" \
		-d $(output_dir)/zImage \
		$(output_dir)/uImage ; \
	fi
	# If we have a TFTP boot directory
	if [ -w $(tftproot) ] ; then \
	   cp $(output_dir)/uImage $(tftproot) ; \
	   echo "set serverip 169.254.1.1 ; set ipaddr 169.254.1.2 ; tftpboot 0xc1000000 uImage ; bootm" ; \
	fi

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: