mistral: Add stub RBF generation

Signed-off-by: gatecat <gatecat@ds0.me>

mistral/arch.h

@@ -483,6 +483,7 @@ struct Arch : BaseArch<ArchRanges>
     // -------------------------------------------------
 
     void init_base_bitstream(); // base_bitstream.cc
+    void build_bitstream();     // bitstream.cc
 };
 
 NEXTPNR_NAMESPACE_END

mistral/base_bitstream.cc

@@ -33,15 +33,17 @@ void default_sx120f(CycloneV *cv)
     cv->bmux_m_set(CycloneV::PMA3, CycloneV::xy2pos(0, 23), CycloneV::FFPLL_IQCLK_DIRECTION, 1, CycloneV::UP);
     cv->bmux_m_set(CycloneV::PMA3, CycloneV::xy2pos(0, 35), CycloneV::FFPLL_IQCLK_DIRECTION, 0, CycloneV::UP);
     cv->bmux_m_set(CycloneV::PMA3, CycloneV::xy2pos(0, 35), CycloneV::FFPLL_IQCLK_DIRECTION, 1, CycloneV::UP);
-    cv->bmux_b_set(CycloneV::PMA3, CycloneV::xy2pos(0, 35), CycloneV::FPLL_DRV_EN, -1, false);
+    cv->bmux_b_set(CycloneV::PMA3, CycloneV::xy2pos(0, 35), CycloneV::FPLL_DRV_EN, 0, 0);
-    cv->bmux_m_set(CycloneV::PMA3, CycloneV::xy2pos(0, 35), CycloneV::HCLK_TOP_OUT_DRIVER, -1, CycloneV::TRISTATE);
+    cv->bmux_m_set(CycloneV::PMA3, CycloneV::xy2pos(0, 35), CycloneV::HCLK_TOP_OUT_DRIVER, 0, CycloneV::TRISTATE);
     // Default PLL config
-    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN0, -1, true);
+    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN0, 0, 1);
-    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN0_PRECOMP, -1, true);
+    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN0_PRECOMP, 0, 1);
-    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN1, -1, true);
+    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN1, 0, 1);
-    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN1_PRECOMP, -1, true);
+    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_ATB_EN1_PRECOMP, 0, 1);
-    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_BG_KICKSTART, -1, true);
+    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_BG_KICKSTART, 0, 1);
-    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_VBGMON_POWERDOWN, -1, true);
+    cv->bmux_b_set(CycloneV::FPLL, CycloneV::xy2pos(0, 73), CycloneV::PL_AUX_VBGMON_POWERDOWN, 0, 1);
+    // Default TERM config
+    cv->bmux_b_set(CycloneV::TERM, CycloneV::xy2pos(89, 34), CycloneV::INTOSC_2_EN, 0, 0);
 
     // Discover these mux values using
     //   grep 'i [_A-Z0-9.]* 1' empty.bt

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

mistral/main.cc

@@ -50,12 +50,24 @@ po::options_description MistralCommandHandler::getArchOptions()
     specific.add_options()("mistral", po::value<std::string>(), "path to mistral root");
     specific.add_options()("device", po::value<std::string>(), "device name (e.g. 5CSEBA6U23I7)");
     specific.add_options()("qsf", po::value<std::string>(), "path to QSF constraints file");
+    specific.add_options()("rbf", po::value<std::string>(), "RBF bitstream to write");
+
     return specific;
 }
 
 void MistralCommandHandler::customBitstream(Context *ctx)
 {
-    // TODO: rbf gen via mistral
+    if (vm.count("rbf")) {
+        std::string filename = vm["rbf"].as<std::string>();
+        ctx->build_bitstream();
+        std::vector<uint8_t> data;
+        ctx->cyclonev->rbf_save(data);
+
+        std::ofstream out(filename, std::ios::binary);
+        if (!out)
+            log_error("Failed to open output RBF file %s.\n", filename.c_str());
+        out.write(reinterpret_cast<const char *>(data.data()), data.size());
+    }
 }
 
 std::unique_ptr<Context> MistralCommandHandler::createContext(std::unordered_map<std::string, Property> &values)