ice40: Writing an empty ASC file

Signed-off-by: David Shah <davey1576@gmail.com>

.gitignore

@@ -19,3 +19,6 @@ CMakeCache.txt
 a.out
 *.json
 build/
+*.asc
+*.bin
+

ice40/bitstream.cc

@@ -0,0 +1,99 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Clifford Wolf <clifford@clifford.at>
+ *  Copyright (C) 2018  David Shah <dave@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 "bitstream.h"
+#include <vector>
+
+inline TileType tile_at(const Chip &chip, int x, int y)
+{
+    return chip.chip_info.tile_grid[y * chip.chip_info.width + x];
+}
+
+void write_asc(const Chip &chip, std::ostream &out)
+{
+    // [y][x][row][col]
+    const ChipInfoPOD &ci = chip.chip_info;
+    const BitstreamInfoPOD &bi = *ci.bits_info;
+    std::vector<std::vector<std::vector<std::vector<int8_t>>>> config;
+    config.resize(ci.height);
+    for (int y = 0; y < ci.height; y++) {
+        config.at(y).resize(ci.width);
+        for (int x = 0; x < ci.width; x++) {
+            TileType tile = tile_at(chip, x, y);
+            int rows = bi.tiles_nonrouting[tile].rows;
+            int cols = bi.tiles_nonrouting[tile].cols;
+            config.at(y).at(x).resize(rows, vector<int8_t>(cols));
+        }
+    }
+    out << ".comment from next-pnr" << std::endl;
+
+    switch (chip.args.type) {
+    case ChipArgs::LP384:
+        out << ".device 384" << std::endl;
+        break;
+    case ChipArgs::HX1K:
+    case ChipArgs::LP1K:
+        out << ".device 1k" << std::endl;
+        break;
+    case ChipArgs::HX8K:
+    case ChipArgs::LP8K:
+        out << ".device 8k" << std::endl;
+        break;
+    case ChipArgs::UP5K:
+        out << ".device 5k" << std::endl;
+        break;
+    default:
+        assert(false);
+    }
+    // Write config out
+    for (int y = 0; y < ci.height; y++) {
+        for (int x = 0; x < ci.width; x++) {
+            TileType tile = tile_at(chip, x, y);
+            if (tile == TILE_NONE)
+                continue;
+            switch (tile) {
+            case TILE_LOGIC:
+                out << ".logic_tile";
+                break;
+            case TILE_IO:
+                out << ".io_tile";
+                break;
+            case TILE_RAMB:
+                out << ".ramb_tile";
+                break;
+            case TILE_RAMT:
+                out << ".ramt_tile";
+                break;
+            default:
+                assert(false);
+            }
+            out << " " << x << " " << y << std::endl;
+            for (auto row : config.at(y).at(x)) {
+                for (auto col : row) {
+                    if (col == 1)
+                        out << "1";
+                    else
+                        out << "0";
+                }
+                out << std::endl;
+            }
+            out << std::endl;
+        }
+    }
+}

ice40/bitstream.h

@@ -0,0 +1,28 @@
+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  Clifford Wolf <clifford@clifford.at>
+ *
+ *  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 ICE40_BITSTREAM_H
+#define ICE40_BITSTREAM_H
+
+#include <iostream>
+#include "chip.h"
+
+void write_asc(const Chip &chip, std::ostream &out);
+
+#endif

ice40/chip.cc

@@ -72,7 +72,7 @@ PortPin portPinFromId(IdString id)
 
 // -----------------------------------------------------------------------
 
-Chip::Chip(ChipArgs args)
+Chip::Chip(ChipArgs args) : args(args)
 {
 #ifdef ICE40_HX1K_ONLY
     if (args.type == ChipArgs::HX1K) {

ice40/chip.h

@@ -407,6 +407,7 @@ struct Chip
 
     Chip(ChipArgs args);
 
+    ChipArgs args;
     // -------------------------------------------------
 
     BelId getBelByName(IdString name) const;

ice40/main.cc

@@ -23,6 +23,7 @@
 #include <boost/program_options.hpp>
 #include <fstream>
 #include <iostream>
+#include "bitstream.h"
 #include "design.h"
 #include "jsonparse.h"
 #include "log.h"
@@ -69,6 +70,8 @@ int main(int argc, char *argv[])
                           "python file to execute");
     options.add_options()("json", po::value<std::string>(),
                           "JSON design file to ingest");
+    options.add_options()("asc", po::value<std::string>(),
+                          "asc bitstream file to write");
     options.add_options()("version,v", "show version");
     options.add_options()("lp384", "set device type to iCE40LP384");
     options.add_options()("lp1k", "set device type to iCE40LP1K");
@@ -251,6 +254,12 @@ int main(int argc, char *argv[])
         route_design(&design);
     }
 
+    if (vm.count("asc")) {
+        std::string filename = vm["asc"].as<std::string>();
+        std::ofstream f(filename);
+        write_asc(design.chip, f);
+    }
+
     if (vm.count("run")) {
         std::vector<std::string> files =
                 vm["run"].as<std::vector<std::string>>();