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diff --git a/common/place/parallel_refine.h b/common/place/parallel_refine.h
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+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2021  gatecat <gatecat@ds0.me>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef PARALLEL_REFINE_H
+#define PARALLEL_REFINE_H
+
+#include "nextpnr.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+struct ParallelRefineCfg
+{
+    ParallelRefineCfg(Context *ctx);
+    bool timing_driven;
+    int threads;
+    int hpwl_scale_x, hpwl_scale_y;
+    double lambda = 0.5f;
+    float crit_exp = 8;
+    int inner_iters = 15;
+    int min_thread_size = 500;
+};
+
+bool parallel_refine(Context *ctx, ParallelRefineCfg cfg);
+
+NEXTPNR_NAMESPACE_END
+
+#endif