# See LICENSE for license details.

# Required variables:
# - MODEL
# - PROJECT
# - CONFIG_PROJECT
# - CONFIG
# - BUILD_DIR
# - FPGA_DIR

# Optional variables:
# - EXTRA_FPGA_VSRCS

# export to bootloader
export ROMCONF=$(BUILD_DIR)/$(CONFIG_PROJECT).$(CONFIG).rom.conf

# export to fpga-shells
export FPGA_TOP_SYSTEM=$(MODEL)
export FPGA_BUILD_DIR=$(BUILD_DIR)/$(FPGA_TOP_SYSTEM)
export fpga_common_script_dir=$(FPGA_DIR)/common/tcl
export fpga_board_script_dir=$(FPGA_DIR)/$(BOARD)/tcl

export BUILD_DIR

EXTRA_FPGA_VSRCS ?=
PATCHVERILOG ?= ""
BOOTROM_DIR ?= ""

base_dir := $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
export rocketchip_dir := $(base_dir)/rocket-chip
SBT ?= java -jar $(rocketchip_dir)/sbt-launch.jar

# Build firrtl.jar and put it where chisel3 can find it.
FIRRTL_JAR ?= $(rocketchip_dir)/firrtl/utils/bin/firrtl.jar
FIRRTL ?= java -Xmx2G -Xss8M -XX:MaxPermSize=256M -cp $(FIRRTL_JAR) firrtl.Driver

$(FIRRTL_JAR): $(shell find $(rocketchip_dir)/firrtl/src/main/scala -iname "*.scala")
	$(MAKE) -C $(rocketchip_dir)/firrtl SBT="$(SBT)" root_dir=$(rocketchip_dir)/firrtl build-scala
	touch $(FIRRTL_JAR)
	mkdir -p $(rocketchip_dir)/lib
	cp -p $(FIRRTL_JAR) rocket-chip/lib
	mkdir -p $(rocketchip_dir)/chisel3/lib
	cp -p $(FIRRTL_JAR) $(rocketchip_dir)/chisel3/lib

# Build .fir
firrtl := $(BUILD_DIR)/$(CONFIG_PROJECT).$(CONFIG).fir
$(firrtl): $(shell find $(base_dir)/src/main/scala -name '*.scala') $(FIRRTL_JAR)
	mkdir -p $(dir $@)
	$(SBT) "run-main freechips.rocketchip.system.Generator $(BUILD_DIR) $(PROJECT) $(MODEL) $(CONFIG_PROJECT) $(CONFIG)"

.PHONY: firrtl
firrtl: $(firrtl)

# Build .v
verilog := $(BUILD_DIR)/$(CONFIG_PROJECT).$(CONFIG).v
$(verilog): $(firrtl) $(FIRRTL_JAR)
	$(FIRRTL) -i $(firrtl) -o $@ -X verilog
ifneq ($(PATCHVERILOG),"")
	$(PATCHVERILOG)
endif

.PHONY: verilog
verilog: $(verilog)

romgen := $(BUILD_DIR)/$(CONFIG_PROJECT).$(CONFIG).rom.v
$(romgen): $(verilog)
ifneq ($(BOOTROM_DIR),"")
	$(MAKE) -C $(BOOTROM_DIR) romgen
	mv $(BUILD_DIR)/rom.v $@
endif

.PHONY: romgen
romgen: $(romgen)

# Build .mcs
mcs := $(BUILD_DIR)/$(CONFIG_PROJECT).$(CONFIG).mcs
$(mcs): $(romgen)
	VSRCS="$(VSRCS)" $(MAKE) -C $(FPGA_DIR) mcs
	cp $(BUILD_DIR)/$(MODEL)/obj/system.mcs $@

.PHONY: mcs
mcs: $(mcs)

# Clean
.PHONY: clean
clean:
ifneq ($(BOOTROM_DIR),"")
	$(MAKE) -C $(BOOTROM_DIR) clean
endif
	$(MAKE) -C $(FPGA_DIR) clean
	rm -rf $(BUILD_DIR)