From 4c978bf463f171b199a16ea51de59c46822e424d Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Fri, 24 Jun 2022 10:24:01 +0200
Subject: [PATCH] build/generic_toolchain: Add add_false_path_constraint and
 remove it from altera/quartus, lattice/trellis.

---
 litex/build/altera/quartus.py    | 6 ------
 litex/build/generic_toolchain.py | 9 ++++++++-
 litex/build/lattice/trellis.py   | 6 ------
 3 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/litex/build/altera/quartus.py b/litex/build/altera/quartus.py
index 5b4f16bda..3b143045f 100644
--- a/litex/build/altera/quartus.py
+++ b/litex/build/altera/quartus.py
@@ -213,9 +213,3 @@ fi
 
         if subprocess.call(shell + [script]) != 0:
             raise OSError("Error occured during Quartus's script execution.")
-
-    def add_false_path_constraint(self, platform, from_, to):
-        from_.attr.add("keep")
-        to.attr.add("keep")
-        if (to, from_) not in self.false_paths:
-            self.false_paths.add((from_, to))
diff --git a/litex/build/generic_toolchain.py b/litex/build/generic_toolchain.py
index 847035a5e..ad3426baa 100644
--- a/litex/build/generic_toolchain.py
+++ b/litex/build/generic_toolchain.py
@@ -6,6 +6,7 @@
 # SPDX-License-Identifier: BSD-2-Clause
 
 import os
+import math
 
 from migen.fhdl.structure import _Fragment
 
@@ -95,4 +96,10 @@ class GenericToolchain:
             if period != self.clocks[clk]:
                 raise ValueError("Clock already constrained to {:.2f}ns, new constraint to {:.2f}ns"
                     .format(self.clocks[clk], period))
-        self.clocks[clk] = period
\ No newline at end of file
+        self.clocks[clk] = period
+
+    def add_false_path_constraint(self, platform, from_, to):
+        from_.attr.add("keep")
+        to.attr.add("keep")
+        if (to, from_) not in self.false_paths:
+            self.false_paths.add((from_, to))
diff --git a/litex/build/lattice/trellis.py b/litex/build/lattice/trellis.py
index 03334b1b7..6f40742d1 100644
--- a/litex/build/lattice/trellis.py
+++ b/litex/build/lattice/trellis.py
@@ -220,12 +220,6 @@ class LatticeTrellisToolchain(GenericToolchain):
         platform.add_platform_command("""FREQUENCY PORT "{clk}" {freq} MHz;""".format(
             freq=str(float(1/period)*1000), clk="{clk}"), clk=clk)
 
-    def add_false_path_constraint(self, platform, from_, to):
-        from_.attr.add("keep")
-        to.attr.add("keep")
-        if (to, from_) not in self.false_paths:
-            self.false_paths.add((from_, to))
-
 def trellis_args(parser):
     toolchain_group = parser.add_argument_group(title="Toolchain options")
     toolchain_group.add_argument("--yosys-nowidelut",      action="store_true", help="Use Yosys's nowidelut mode.")