Parameterize PDK specific variables in common_pdn.tcl

sky130/openlane/common_pdn.tcl

diff --git a/sky130/openlane/common_pdn.tcl b/sky130/openlane/common_pdn.tcl
index 3982b7f..a608757 100644
--- a/sky130/openlane/common_pdn.tcl
+++ b/sky130/openlane/common_pdn.tcl
@@ -13,10 +13,12 @@
 
 if { [info exists ::env(FP_PDN_ENABLE_GLOBAL_CONNECTIONS)] } {
     if { $::env(FP_PDN_ENABLE_GLOBAL_CONNECTIONS) == 1 } {
-        add_global_connection -net $::env(VDD_NET) -inst_pattern .* -pin_pattern {VPWR} -power
-        add_global_connection -net $::env(VDD_NET) -inst_pattern .* -pin_pattern {VPB} -power
-        add_global_connection -net $::env(GND_NET) -inst_pattern .* -pin_pattern {VGND} -ground
-        add_global_connection -net $::env(GND_NET) -inst_pattern .* -pin_pattern {VNB} -ground
+        foreach power_pin $::env(STD_CELL_POWER_PINS) {
+            add_global_connection -net $::env(VDD_NET) -inst_pattern .* -pin_pattern $power_pin -power
+        }
+        foreach ground_pin $::env(STD_CELL_GROUND_PINS) {
+            add_global_connection -net $::env(GND_NET) -inst_pattern .* -pin_pattern $ground_pin -ground
+        }
     }
 }
 
@@ -58,7 +60,7 @@
     orient {R0 R180 MX MY R90 R270 MXR90 MYR90}
     power_pins $::env(VDD_NET)
     ground_pins $::env(GND_NET)
-    blockages "li1 met1 met2 met3 met4"
+    blockages $::env(MACRO_BLOCKAGES_LAYER)
     straps {
     }
     connect {{$::env(FP_PDN_LOWER_LAYER)_PIN_ver $::env(FP_PDN_UPPER_LAYER)}}

sky130/openlane/config.tcl

diff --git a/sky130/openlane/config.tcl b/sky130/openlane/config.tcl
index 310a82b..c16fee3 100755
--- a/sky130/openlane/config.tcl
+++ b/sky130/openlane/config.tcl
@@ -8,6 +8,9 @@
 set ::env(VDD_PIN) "VPWR"
 set ::env(GND_PIN) "VGND"
 
+set ::env(STD_CELL_POWER_PINS) "VPWR VPB"
+set ::env(STD_CELL_GROUND_PINS) "VGND VNB"
+
 # Technology LEF
 #ifdef EF_FORMAT
 set ::env(TECH_LEF) "$::env(PDK_ROOT)/$::env(PDK)/libs.ref/techLEF/$::env(STD_CELL_LIBRARY)/$::env(STD_CELL_LIBRARY).tlef"
@@ -160,6 +163,9 @@
 set ::env(FP_PDN_CORE_RING_VOFFSET) 6
 set ::env(FP_PDN_CORE_RING_HOFFSET) 6
 
+# PDN Macro blockages list
+set ::env(MACRO_BLOCKAGES_LAYER) "li1 met1 met2 met3 met4"
+
 # Used for parasitics estimation, IR drop analysis, etc
 set ::env(WIRE_RC_LAYER) "met1"
 set ::env(DATA_WIRE_RC_LAYER) "met2"