1 files changed, 84 insertions, 0 deletions
diff --git a/mistral/bitstream.cc b/mistral/bitstream.cc
new file mode 100644
index 00000000..9ed3a161
--- /dev/null
+++ b/mistral/bitstream.cc
@@ -0,0 +1,84 @@
+/*
+ *  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.
+ *
+ */
+
+#include "log.h"
+#include "nextpnr.h"
+#include "util.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+namespace {
+struct MistralBitgen
+{
+    MistralBitgen(Context *ctx) : ctx(ctx), cv(ctx->cyclonev){};
+    Context *ctx;
+    CycloneV *cv;
+
+    void init()
+    {
+        ctx->init_base_bitstream();
+        // Default options
+        cv->opt_b_set(CycloneV::ALLOW_DEVICE_WIDE_OUTPUT_ENABLE_DIS, true);
+        cv->opt_n_set(CycloneV::CRC_DIVIDE_ORDER, 8);
+        cv->opt_b_set(CycloneV::CVP_CONF_DONE_EN, true);
+        cv->opt_b_set(CycloneV::DEVICE_WIDE_RESET_EN, true);
+        cv->opt_n_set(CycloneV::DRIVE_STRENGTH, 8);
+        cv->opt_b_set(CycloneV::IOCSR_READY_FROM_CSR_DONE_EN, true);
+        cv->opt_b_set(CycloneV::NCEO_DIS, true);
+        cv->opt_b_set(CycloneV::OCT_DONE_DIS, true);
+        cv->opt_r_set(CycloneV::OPT_A, 0x1dff);
+        cv->opt_r_set(CycloneV::OPT_B, 0xffffff402dffffffULL);
+        cv->opt_b_set(CycloneV::RELEASE_CLEARS_BEFORE_TRISTATES_DIS, true);
+        cv->opt_b_set(CycloneV::RETRY_CONFIG_ON_ERROR_EN, true);
+        cv->opt_r_set(CycloneV::START_UP_CLOCK, 0x3F);
+    }
+
+    void write_routing()
+    {
+        for (auto net : sorted(ctx->nets)) {
+            NetInfo *ni = net.second;
+            for (auto wire : sorted_ref(ni->wires)) {
+                PipId pip = wire.second.pip;
+                if (pip == PipId())
+                    continue;
+                WireId src = ctx->getPipSrcWire(pip), dst = ctx->getPipDstWire(pip);
+                // Only write out routes that are entirely in the Mistral domain. Everything else is dealt with
+                // specially
+                if (src.is_nextpnr_created() || dst.is_nextpnr_created())
+                    continue;
+                cv->rnode_link(src.node, dst.node);
+            }
+        }
+    }
+
+    void run()
+    {
+        cv->clear();
+        init();
+        write_routing();
+    }
+};
+} // namespace
+
+void Arch::build_bitstream()
+{
+    MistralBitgen gen(getCtx());
+    gen.run();
+}
+
+NEXTPNR_NAMESPACE_END