USE_LLVM	:= 1
CROSS_GCC	:= arm-none-eabi-
ifeq ($(USE_LLVM),1)
	COMPILER	:= LLVM=1
else
	COMPILER	:= CROSS_COMPILE=$(CROSS_GCC)
endif
build_dir       := $(CURDIR)/build-kirkwood
output_dir	:= $(HOME)
rootfs		:= $(HOME)/rootfs-kirkwood.cpio
install_dir     := $(build_dir)/install
config_file     := $(build_dir)/.config
strip		:= $(CROSS_COMPILE)strip
objcopy		:= $(CROSS_COMPILE)objcopy
rootfsbase	:= $(shell basename $(rootfs))
dtb		:= $(build_dir)/arch/arm/boot/dts/kirkwood-pogoplug-series-4.dtb
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 [PLATFORM=foo] - configure for platform \"foo\""
	@echo "make build - build the kernel and produce a RAMdisk image"
	@echo
	@echo "example:"
	@echo "make -f kirkwood.mak config"
	@echo "make -f kirkwood.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)
	@if [ -r $(config_file) ] ; then \
		rm $(config_file) ; \
	fi
	$(MAKE) $(make_options) mvebu_v5_defconfig

config-initramfs: config-base have-rootfs
	@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

# For early printk
config-earlydebug: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable DEBUG_LL \
	--enable EARLY_PRINTK \
	--enable DEBUG_MVEBU_UART0_ALTERNATE \
	--set-str CMDLINE "root=/dev/ram0 console=ttyS0,115200n8 earlyprintk"

config-devicetree: config-base
	# Configure in the optional device tree if available
	if [ -r $(dtb) ] ; then \
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable USE_OF \
	--enable ARM_APPENDED_DTB \
	--enable ARM_ATAG_DTB_COMPAT \
	--enable ATAGS \
	--enable PROC_DEVICETREE ; \
	fi

config-bfq: config-base
	@echo "Enabling BFQ"
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable MQ_IOSCHED_DEADLINE \
	--enable MQ_IOSCHED_KYBER \
	--enable IOSCHED_BFQ \
	--enable BFQ_GROUP_IOSCHED

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

# Config options needed to bring up rootfs on distros
config-distro: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable PARTITION_ADVANCED \
	--enable LDM_PARTITION \
	--enable MSDOS_PARTITION \
	--enable EXT4_FS \
	--enable EXT4_POSIX_ACL \
	--enable DEVTMPFS \
	--enable CGROUPS \
	--enable INOTIFY_USER \
	--enable SIGNALFD \
	--enable TIMERFD \
	--enable EPOLL \
	--enable NET \
	--enable SYSFS \
	--disable SYSFS_DEPRECATED \
	--enable PROC_FS \
	--enable FHANDLE \
	--enable TMPFS_XATTR \
	--enable TMPFS_POSIX_ACL \
	--enable CGROUP_SCHED \
	--enable FAIR_GROUP_SCHED \
	--enable CFS_BANDWIDTH \
	--disable RT_GROUP_SCHED \
	--enable SECCOMP \
	--enable SECCOMP_FILTER \
	--enable CHECKPOINT_RESTORE \
	--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 \
	--enable AUTOFS4_FS \
	--enable BSD_PROCESS_ACCT \
	--enable BSD_PROCESS_ACCT_V3 \
	--enable TASKSTATS \
	--enable TASK_DELAY_ACCT \
	--enable TASK_XACCT \
	--enable TASK_IO_ACCOUNTING \
	--enable BUILD_BIN2C \
	--enable IKCONFIG \
	--enable IKCONFIG_PROC \
	--enable PAGE_COUNTER \
	--enable MEMCG \
	--enable MEMCG_SWAP \
	--enable MEMCG_SWAP_ENABLED \
	--enable MEMCG_KMEM \
	--enable CGROUP_PERF \
	--enable CGROUP_WRITEBACK \
	--enable USER_NS \
	--enable BLK_DEV_BSG \
	--enable BLK_DEV_BSGLIB \
	--enable BLK_DEV_INTEGRITY \
	--enable NET_INGRESS \
	--enable IP_ADVANCED_ROUTER \
	--set-str UEVENT_HELPER_PATH "" \
	--enable WANT_DEV_COREDUMP \
	--enable DEV_COREDUMP \
	--enable CHR_DEV_SG \
	--enable KEYS \
	--enable ENCRYPTED_KEYS \
	--enable SECURITY \
	--enable SECURITYFS \
	--enable SECURITY_NETWORK \
	--enable SECURITY_NETWORK_XFRM \
	--enable SECURITY_PATH \
	--enable INTEGRITY \
	--enable CRYPTO_USER_API \
	--enable CRYPTO_USER_API_HASH \
	--enable CRYPTO_USER_API_SKCIPHER \
	--enable CRYPTO_USER_API_AEAD \
	--enable ARM_CRYPTO \
	--enable CRYPTO_SHA1_ARM \
	--enable CRYPTO_SHA256_ARM \
	--enable CRYPTO_SHA512_ARM \
	--enable CRYPTO_AES_ARM \
	--enable BINARY_PRINTF \
	--enable MD \
	--enable BLK_DEV_DM_BUILTIN \
	--enable BLK_DEV_DM \
	--enable DM_CRYPT \
	--enable DM_UEVENT \
	--enable SCSI \
	--enable USB_STORAGE

config-mainlined-features: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable ARM_KIRKWOOD_CPUIDLE \
	--enable MTD_UBI \
	--enable UBIFS_FS \
	--enable NO_HZ_COMMON \
	--enable NO_HZ_IDLE \
	--enable TICK_ONESHOT

config-nas-features: config-base config-mainlined-features config-distro
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable CIFS \
	--enable CIFS_SMB2 \
	--enable TUN \
	--enable CRYPTO_SHA256 \
	--enable CRYPTO_SHA512 \
	--enable CRYPTO_XTS

# config-initramfs
config: config-base config-mainlined-features config-devicetree config-distro config-nas-features config-bfq config-cfi
	# Reconfigure a bit
	$(CURDIR)/scripts/config --file $(config_file) \
	--set-str CMDLINE "root=/dev/sda1 rw rootwait console=ttyS0,115200n8" \
	--enable DEBUG_FS
	yes "" | make $(make_options) oldconfig

menuconfig: FORCE
	$(MAKE) $(make_options) menuconfig

saveconfig: config-base config-mainlined-features FORCE
	yes "" | make $(make_options) oldconfig
	$(MAKE) $(make_options) savedefconfig
	cp $(build_dir)/defconfig arch/arm/configs/mvebu_v5_defconfig

updateconfig: config-base FORCE
	yes "" | make $(make_options) oldconfig
	$(MAKE) $(make_options) savedefconfig
	cp $(build_dir)/defconfig arch/arm/configs/mvebu_v5_defconfig

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

build-dtbs: FORCE
	$(MAKE) $(make_options) dtbs

build: have-rootfs have-crosscompiler build-zimage build-dtbs FORCE
	@echo "Copy zImage to $(output_dir)/zImage..."
	@if [ -r $(build_dir)/arch/arm/boot/zImage ] ; then \
	    cp $(build_dir)/arch/arm/boot/zImage $(output_dir)/zImage ; \
	fi
	@if [ -r $(dtb) ] ; then \
	   echo "Catenate DTB onto zImage ..." ; \
	   cat $(dtb) >> $(output_dir)/zImage ; \
	fi
	# Generate uImage
	mkimage \
		-A arm \
		-O linux \
		-T kernel \
		-C none \
		-a 0x00008000 \
		-e 0x00008000 \
		-n "Kirkwood Linux kernel" \
		-d $(output_dir)/zImage \
		$(output_dir)/uImage
	# If we have a TFTP boot directory
	@if [ -w /var/lib/tftpboot ] ; then \
	  echo "copy uImage to /var/lib/tftpboot" ; \
	  cp $(output_dir)/uImage /var/lib/tftpboot ; \
	fi
	@echo "Boot from ethernet:"
	@echo "setenv bootargs console=ttyS0,115200n8 root=/dev/sda1 rw rootwait rootfstype=ext4;setenv serverip 192.168.1.170;setenv ipaddr 192.168.1.180;setenv bootfile uImage;tftpboot 0x00800000;bootm 0x00800000"

TAGS: FORCE
	$(MAKE) $(make_options) TAGS

clean:
	$(MAKE) -f Makefile clean
	rm -f $(module_files)
	rm -rf build

# 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: