1 files changed, 57 insertions, 0 deletions
diff --git a/nexus/CMakeLists.txt b/nexus/CMakeLists.txt
new file mode 100644
index 00000000..d58bd689
--- /dev/null
+++ b/nexus/CMakeLists.txt
@@ -0,0 +1,57 @@
+cmake_minimum_required(VERSION 3.5)
+project(chipdb-nexus NONE)
+
+set(ALL_NEXUS_FAMILIES LIFCL)
+
+# NOTE: Unlike iCE40 and ECP5; one database can cover all densities of a given family
+
+set(NEXUS_FAMILIES ${ALL_NEXUS_FAMILIES} CACHE STRING
+    "Include support for these Nexus families (available: ${ALL_NEXUS_FAMILIES})")
+message(STATUS "Enabled Nexus families: ${NEXUS_FAMILIES}")
+
+if(DEFINED NEXUS_CHIPDB)
+    add_custom_target(chipdb-nexus-bbas ALL)
+else()
+    # shared among all families
+    set(OXIDE_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}" CACHE STRING
+        "prjoxide install prefix")
+    message(STATUS "prjoxide install prefix: ${OXIDE_INSTALL_PREFIX}")
+
+    set(all_device_bbas)
+    file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/chipdb)
+    foreach(subfamily ${NEXUS_FAMILIES})
+        if(NOT subfamily IN_LIST ALL_NEXUS_FAMILIES)
+            message(FATAL_ERROR "${subfamily} is not a supported Nexus family")
+        endif()
+
+        set(family_bba chipdb/chipdb-${subfamily}.bba)
+        set(PRJOXIDE_TOOL ${OXIDE_INSTALL_PREFIX}/bin/prjoxide)
+        add_custom_command(
+            OUTPUT ${family_bba}
+            COMMAND 
+                ${PRJOXIDE_TOOL} bba-export ${subfamily} ${CMAKE_CURRENT_SOURCE_DIR}/constids.inc ${family_bba}.new
+            # atomically update
+            COMMAND ${CMAKE_COMMAND} -E rename ${family_bba}.new ${family_bba}
+            DEPENDS
+                ${PRJOXIDE_TOOL}
+                ${CMAKE_CURRENT_SOURCE_DIR}/constids.inc
+                ${CMAKE_CURRENT_SOURCE_DIR}/bba_version.inc
+                ${PREVIOUS_CHIPDB_TARGET}
+            VERBATIM)
+        list(APPEND all_device_bbas ${family_bba})
+        if(SERIALIZE_CHIPDBS)
+            set(PREVIOUS_CHIPDB_TARGET ${CMAKE_CURRENT_BINARY_DIR}/${family_bba})
+        endif()
+    endforeach()
+
+    add_custom_target(chipdb-nexus-bbas ALL DEPENDS ${all_device_bbas})
+
+    get_directory_property(has_parent PARENT_DIRECTORY)
+    if(has_parent)
+        set(NEXUS_CHIPDB ${CMAKE_CURRENT_BINARY_DIR}/chipdb PARENT_SCOPE)
+        # serialize chipdb build across multiple architectures
+        set(PREVIOUS_CHIPDB_TARGET chipdb-nexus-bbas PARENT_SCOPE)
+    else()
+        message(STATUS "Build nextpnr with -DNEXUS_CHIPDB=${CMAKE_CURRENT_BINARY_DIR}/chipdb")
+    endif()
+endif()