USE_LLVM	:= 0
CROSS_GCC	:= armeb-openwrt-linux-
ifeq ($(USE_LLVM),1)
	# lld does not support big endian
	COMPILER	:= LLVM=1 LD=ld.bfd
else
	COMPILER	:= CROSS_COMPILE=$(CROSS_GCC)
endif
build_dir       := $(CURDIR)/build-ixp4
output_dir	:= $(HOME)
rootfs		:= $(HOME)/rootfs-ixp4.cpio
rootfsbase	:= $(shell basename $(rootfs))
install_dir     := $(build_dir)/install
config_file     := $(build_dir)/.config
makejobs	:= $(shell grep '^processor' /proc/cpuinfo | sort -u | wc -l)
makethreads	:= $(shell dc -e "$(makejobs) 1 + p")
variant		:= ixp42x-linksys-nslu2
#variant		:= ixp42x-gateworks-gw2348
#variant		:= ixp43x-gateworks-gw2358
#variant		:= ixp42x-arcom-vulcan
#variant		:= ixp42x-netgear-wg302v1
#variant		:= ixp42x-usrobotics-usr8200
dtb		:= $(build_dir)/arch/arm/boot/dts/intel/ixp/intel-$(variant).dtb
tftp_dir	:= /var/lib/tftpboot
nfs_dir		:= /mnt/storage/nfsroot/ixp4xx
firmware_dir	:= /home/linus/src/firmware/ixp4xx-firmware

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

.PHONY: help
help:
	@echo "****  Common Makefile  ****"
	@echo "make config - configure for platform "
	@echo "make build - build the kernel and produce a RAMdisk image"
	@echo
	@echo "example:"
	@echo "make -f ixp4.mak config"
	@echo "make -f ixp4.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) ixp4xx_defconfig
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable DEBUG_FS

# --enable MTD_ROOTFS_ROOT_DEV
# --enable MTD_SPLIT
# --set-str MTD_SPLIT_FIRMWARE_NAME firmware
# --enable MTD_SPLIT_SQUASHFS_ROOT
# --enable MTD_SPLIT_SUPPORT
config-openwrt: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable 32BIT \
	--enable 64BIT_TIME \
	--enable ADVISE_SYSCALLS \
	--enable AEABI \
	--enable AF_UNIX_OOB \
	--enable AIO \
	--enable ALLOW_DEV_COREDUMP \
	--enable ANON_INODES \
	--enable BLK_DEV \
	--enable BLOCK \
	--enable BPF \
	--enable BPF_JIT \
	--enable BPF_JIT_DEFAULT_ON \
	--enable BPF_SYSCALL \
	--enable BPF_UNPRIV_DEFAULT_OFF \
	--enable BQL \
	--enable BRANCH_PROFILE_NONE \
	--enable BRIDGE \
	--enable BRIDGE_IGMP_SNOOPING \
	--enable BRIDGE_VLAN_FILTERING \
	--enable CRC32 \
	--enable CRC32_SARWATE \
	--enable DEVPORT \
	--enable EMBEDDED \
	--enable EPOLL \
	--enable EXPERT \
	--enable EXPORTFS \
	--enable EXT2_FS_XATTR \
	--enable EXT4_USE_FOR_EXT2 \
	--enable FSNOTIFY \
	--enable FUTEX \
	--enable FUTEX_PI \
	--enable FW_LOADER \
	--enable GENERIC_NET_UTILS \
	--enable GENERIC_PTDUMP \
	--enable HIGH_RES_TIMERS \
	--enable INET \
	--enable INOTIFY_USER \
	--enable INPUT_EVDEV \
	--enable IP_ADVANCED_ROUTER \
	--enable IP_MROUTE_MULTIPLE_TABLES \
	--enable IP_MULTICAST \
	--enable IP_MULTIPLE_TABLES \
	--enable IP_ROUTE_MULTIPATH \
	--enable IP_ROUTE_VERBOSE \
	--enable KUSER_HELPERS \
	--enable MAY_USE_DEVLINK \
	--enable MII \
	--enable MTD \
	--enable MTD_BLOCK \
	--enable NET \
	--enable NETDEVICES \
	--enable NF_TABLES_ARP \
	--enable NF_TABLES_BRIDGE \
	--enable NF_TABLES_INET \
	--enable NF_TABLES_IPV4 \
	--enable NF_TABLES_IPV6 \
	--enable NF_TABLES_NETDEV \
	--enable JFFS2_FS \
	--enable PACKET \
	--enable POSIX_TIMERS \
	--enable SIGNALFD \
	--enable SQUASHFS \
	--enable SQUASHFS_XZ \
	--enable OVERLAY_FS \
	--enable DEVTMPFS \
	--enable CGROUPS \
	--enable TIMERFD \
	--enable TINY_RCU \
	--enable TMPFS \
	--enable TMPFS_XATTR \
	--enable UNIX \
	--enable SYSFS

config-initramfs: config-base have-rootfs
	cp $(rootfs) $(build_dir)/$(rootfsbase)
	# Configure in the initramfs
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable BLK_DEV_RAM \
	--enable BLK_DEV_INITRD \
	--enable TMPFS \
	--enable TMPFS_POSIX_ACL \
	--set-str INITRAMFS_SOURCE $(rootfsbase) \
	--enable INITRAMFS_COMPRESSION_XZ

config-ext4-rootfs: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable PARTITION_ADVANCED \
	--enable MSDOS_PARTITION \
	--enable EFI_PARTITION \
	--enable EXT3_FS \
	--enable EXT4_FS \
	--set-str CMDLINE "root=/dev/sda1 rw rootwait" \
	--enable CONFIG_CMDLINE_EXTEND

config-ksmbd: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable SMB_SERVER

config-earlydebug: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable DEBUG_KERNEL \
	--enable DEBUG_LL \
	--enable EARLY_PRINTK

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

config-mainlined: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable NEW_LEDS \
	--enable LEDS_CLASS \
	--enable LEDS_GPIO \
	--enable LEDS_TRIGGERS \
	--enable LEDS_TRIGGER_HEARTBEAT \
	--enable MTD \
	--enable MTD_PHYSMAP \
	--enable MTD_PHYSMAP_OF \
	--enable MTD_CFI \
	--enable MTD_CFI_INTELEXT \
	--enable MTD_CFI_AMDSTD \
	--enable MTD_CFI_ADV_OPTIONS \
	--enable MTD_CFI_NOSWAP \
	--enable MTD_OTP \
	--enable MTD_REDBOOT_PARTS \
	--enable PCI \
	--enable PCI_IXP4XX \
	--enable CRYPTO \
	--enable CRYPTO_HW \
	--enable CRYPTO_DEV_IXP4XX \
	--enable HW_RANDOM \
	--enable HW_RANDOM_IXP4XX \
	--enable ATA \
	--enable PATA_IXP4XX_CF \
	--enable SERIAL_OF_PLATFORM \
	--enable WAN \
	--enable HDLC \
	--enable IXP4XX_HSS

config-nslu2: config-base config-ext4-rootfs config-ksmbd
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable RTC_DRV_X1205 \
	--enable INPUT \
	--enable INPUT_KEYBOARD \
	--disable KEYBOARD_ATKBD \
	--enable KEYBOARD_GPIO \
	--enable POWER_RESET \
	--enable POWER_RESET_GPIO \
	--enable I2C \
	--enable I2C_GPIO \
	--enable PWM \
	--enable PWM_GPIO \
	--enable INPUT_MISC \
	--enable INPUT_PWM_BEEPER

config-avila: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable RTC_DRV_DS1672 \
	--enable EEPROM_AT24 \
	--disable EEPROM_LEGACY \
	--enable SENSORS_AD7418 \
	--enable GPIO_PCA953X \
	--enable I2C \
	--enable I2C_GPIO \
	--enable NEW_LEDS \
	--enable LEDS_CLASS \
	--enable LEDS_GPIO \
	--enable I2C_IOP3XX

config-nas100d: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable RTC_DRV_PCF8563 \
	--enable INPUT \
	--enable INPUT_KEYBOARD \
	--disable KEYBOARD_ATKBD \
	--enable KEYBOARD_GPIO \
	--enable POWER_RESET \
	--enable POWER_RESET_GPIO \
	--enable I2C \
	--enable I2C_GPIO

config-cambria: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable RTC_DRV_DS1672 \
	--enable EEPROM_AT24 \
	--disable EEPROM_LEGACY \
	--enable SENSORS_AD7418 \
	--enable GPIO_GW_PLD \
	--enable I2C \
	--enable I2C_GPIO \
	--enable I2C_IOP3XX

config-nfsroot: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable NFS_FS \
	--disable NFS_V2 \
	--enable ROOT_NFS \
	--disable BLK_DEV_INITRD \
	--set-str CMDLINE "root=/dev/nfs rw nfsroot=192.168.1.2:/var/lib/tftpboot/ixp4xx-root,tcp,v3 ip=dhcp" \
	--enable CONFIG_CMDLINE_EXTEND

# This requires the firmware files at the designated location
# and will compile NPE firmware into the kernel.
config-firmware: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--set-str EXTRA_FIRMWARE "NPE-A NPE-A-HSS NPE-B NPE-C" \
	--set-str EXTRA_FIRMWARE_DIR "$(firmware_dir)"

# This target has 64MB RAM and no space for initramfs, use NFS root!
# This config will be hard to combine with support for other IXP4xx machines.
config-wg302: config-base config-nfsroot config-firmware
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable PHYLIB \
	--enable WIRELESS \
	--enable CFG80211 \
	--enable MAC80211 \
	--enable CFG80211_WEXT \
	--enable WLAN \
	--enable WLAN_VENDOR_ATH \
	--enable ATH5K \
	--enable ATH5K_PCI \
	--disable WLAN_VENDOR_ADMTEK \
	--disable WLAN_VENDOR_ATMEL \
	--disable WLAN_VENDOR_BROADCOM \
	--disable WLAN_VENDOR_CISCO \
	--disable WLAN_VENDOR_INTEL \
	--disable WLAN_VENDOR_INTERSIL \
	--disable WLAN_VENDOR_MARVELL \
	--disable WLAN_VENDOR_MEDIATEK \
	--disable WLAN_VENDOR_MICROCHIP \
	--disable WLAN_VENDOR_PURELIFI \
	--disable WLAN_VENDOR_QUANTENNA \
	--disable WLAN_VENDOR_RALINK \
	--disable WLAN_VENDOR_REALTEK \
	--disable WLAN_VENDOR_RSI \
	--disable WLAN_VENDOR_SILABS \
	--disable WLAN_VENDOR_ST \
	--disable WLAN_VENDOR_TI \
	--disable WLAN_VENDOR_ZYDAS

config-usr8200: config-base config-firmware
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable RTC_DRV_R7301 \
	--enable HAVE_NET_DSA \
	--enable NET_DSA \
	--enable NET_DSA_MV88E6060 \
	--enable FIREWIRE \
	--enable FIREWIRE_OHCI \
	--enable USB_EHCI_HCD \
	--enable USB_PCI \
	--enable USB_EHCI_PCI

config-usb-gadget: config-base
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable USB_GADGET \
	--enable USB_PXA25X

# config-initramfs config-openwrt config-earlydebug
# "root=/dev/mtdblock2 rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200"
# Conflicts with config-initramfs: config-wg302
# config: config-base config-nslu2 config-openwrt config-ext4-rootfs
config: config-base config-mainlined config-openwrt config-ext4-rootfs config-cambria config-nslu2 config-firmware config-ksmbd config-cfi
	$(CURDIR)/scripts/config --file $(config_file) \
	--enable KERNEL_XZ
	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
	#cp $(build_dir)/defconfig arch/arm/configs/ixp4xx_defconfig

saveconfig: config-nslu2 config-nas100d
	yes "" | make $(make_options) oldconfig
	$(MAKE) $(make_options) savedefconfig
	cp $(build_dir)/defconfig arch/arm/configs/ixp4xx_defconfig

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

build-zimage-no-dt: build-zimage
	@echo "Copy zImage to $(output_dir)/zImage"
	cp $(build_dir)/arch/arm/boot/zImage $(output_dir)/zImage
	@if [ -w ${tftp_dir} ] ; then \
	  echo "copy zImage to ${tftp_dir}" ; \
	  cp $(output_dir)/zImage ${tftp_dir} ; \
	fi
	@if [ -w ${nfs_dir} ] ; then \
	  echo "copy zImage to ${nfs_dir}" ; \
	  cp $(output_dir)/zImage ${nfs_dir} ; \
	fi
	@echo "Load:"
	@echo "ip_address -l 169.254.1.2 -h 169.254.1.1"
	@echo "load -r -v -b 0x00080000 -h 169.254.1.1 zImage"
	@echo "exec 0x00080000"

build-dtbs: FORCE
	$(MAKE) $(make_options) dtbs W=1 $(make_flags)

check-bindings: FORCE
	$(MAKE) $(make_options) dt_binding_check $(make_flags)
	$(MAKE) $(make_options) dtbs_check $(make_flags)

build-zimage-dt: build-zimage build-dtbs
	@if [ ! -r $(dtb) ] ; then \
	   echo "NO DTB in $(dtb)!" ; \
	   exit 1 ; \
	fi
	@echo "Copy zImage to $(output_dir)/zImage"
	cp $(build_dir)/arch/arm/boot/zImage $(output_dir)/zImage
	@echo "Catenate DTB onto zImage $(output_dir)/zImage..."
	cat $(dtb) >> $(output_dir)/zImage
	# If we have a TFTP boot directory
	@if [ -w ${tftp_dir} ] ; then \
	  echo "copy zImage to ${tftp_dir}" ; \
	  cp $(output_dir)/zImage ${tftp_dir} ; \
	fi
	@if [ -w ${nfs_dir} ] ; then \
	  echo "copy zImage to ${nfs_dir}" ; \
	  cp $(output_dir)/zImage ${nfs_dir} ; \
	fi
	@echo "Load:"
	@echo "ip_address -l 192.168.1.35 -h 192.168.1.2"
	@echo "load -r -v -b 0x00080000 -h 192.168.1.2 zImage"
	@echo "Boot:"
	@echo "exec 0x00080000"

build: build-zimage-dt
	@echo "complete."

build-modules: build
	$(MAKE) $(make_options) modules CONFIG_DEBUG_SECTION_MISMATCH=y

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: