Merge pull request #331 from ericastor/main

Add support for default input-driver and output-load cells to cell libraries

dependency_support/com_google_skywater_pdk/build_defs.bzl

@@ -103,6 +103,8 @@ def _skywater_cell_library_impl(ctx):
             tech_lef = tech_lef,
             cell_lef_definitions = cell_lef_files,
             platform_gds = platform_gds_files,
+            default_input_driver_cell = ctx.attr.default_input_driver_cell,
+            default_output_load = ctx.attr.default_output_load,
         ),
     ]
 
@@ -112,6 +114,14 @@ skywater_cell_library = rule(
         "default_corner": attr.string(
             mandatory = True,
         ),
+        "default_input_driver_cell": attr.string(
+            default = "",
+            doc = "Cell to assume drives primary input nets",
+        ),
+        "default_output_load": attr.string(
+            default = "",
+            doc = "Cell to assume is being driven by each primary output",
+        ),
         "openroad_configuration": attr.label(
             providers = [OpenRoadPdkInfo],
         ),

dependency_support/com_google_skywater_pdk/declare_cell_library.bzl

@@ -19,12 +19,14 @@ load("@rules_hdl//dependency_support/com_google_skywater_pdk:build_defs.bzl", "s
 load("@rules_hdl//dependency_support/com_google_skywater_pdk:cells_info.bzl", "sky130_cell_normalize")
 load(":cell_libraries.bzl", "CELL_LIBRARIES")
 
-def declare_cell_library(workspace_name, name):
+def declare_cell_library(workspace_name, name, default_input_driver_cell = "", default_output_load = ""):
     """This should be called from the BUILD file of a cell library workspace. It sets up the targets for the generated files of the given library.
 
     Args:
       workspace_name: The name of the skywater workspace
       name: The name of the top level standard cell library
+      default_input_driver_cell: Cell to assume drives primary input nets
+      default_output_load: Cell to assume is being driven by each primary output
     """
     native.filegroup(
         name = "spice_models",
@@ -86,6 +88,8 @@ def declare_cell_library(workspace_name, name):
             visibility = ["//visibility:public"],
             openroad_configuration = library.get("open_road_configuration", None),
             tech_lef = "tech/{}.tlef".format(name) if library.get("library_type", None) != "ip_library" else None,
+            default_input_driver_cell = default_input_driver_cell,
+            default_output_load = default_output_load,
         )
 
     # Multi-corner library
@@ -115,4 +119,6 @@ def declare_cell_library(workspace_name, name):
         visibility = ["//visibility:public"],
         openroad_configuration = library.get("open_road_configuration", None),
         tech_lef = "tech/{}.tlef".format(name) if library.get("library_type", None) != "ip_library" else None,
+        default_input_driver_cell = default_input_driver_cell,
+        default_output_load = default_output_load,
     )