techlibs/ice40/synth_ice40.cc

   1 /*
   2  *  yosys -- Yosys Open SYnthesis Suite
   3  *
   4  *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
   5  *
   6  *  Permission to use, copy, modify, and/or distribute this software for any
   7  *  purpose with or without fee is hereby granted, provided that the above
   8  *  copyright notice and this permission notice appear in all copies.
   9  *
  10  *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  *
  18  */
  19
  20 #include "kernel/register.h"
  21 #include "kernel/celltypes.h"
  22 #include "kernel/rtlil.h"
  23 #include "kernel/log.h"
  24
  25 USING_YOSYS_NAMESPACE
  26 PRIVATE_NAMESPACE_BEGIN
  27
  28 bool check_label(bool &active, std::string run_from, std::string run_to, std::string label)
  29 {
  30         if (label == run_from)
  31                 active = true;
  32         if (label == run_to)
  33                 active = false;
  34         return active;
  35 }
  36
  37 struct SynthIce40Pass : public Pass {
  38         SynthIce40Pass() : Pass("synth_ice40", "synthesis for iCE40 FPGAs") { }
  39         virtual void help()
  40         {
  41                 //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
  42                 log("\n");
  43                 log("    synth_ice40 [options]\n");
  44                 log("\n");
  45                 log("This command runs synthesis for iCE40 FPGAs. This work is experimental.\n");
  46                 log("\n");
  47                 log("    -top <module>\n");
  48                 log("        use the specified module as top module (default='top')\n");
  49                 log("\n");
  50                 log("    -run <from_label>:<to_label>\n");
  51                 log("        only run the commands between the labels (see below). an empty\n");
  52                 log("        from label is synonymous to 'begin', and empty to label is\n");
  53                 log("        synonymous to the end of the command list.\n");
  54                 log("\n");
  55                 log("    -flatten\n");
  56                 log("        flatten design before synthesis\n");
  57                 log("\n");
  58                 log("    -retime\n");
  59                 log("        run 'abc' with -dff option\n");
  60                 log("\n");
  61                 log("    -nocarry\n");
  62                 log("        do not use SB_CARRY cells in output netlist\n");
  63                 log("\n");
  64                 log("    -nobram\n");
  65                 log("        do not use SB_RAM40_4K* cells in output netlist\n");
  66                 log("\n");
  67                 log("\n");
  68                 log("The following commands are executed by this synthesis command:\n");
  69                 log("\n");
  70                 log("    begin:\n");
  71                 log("        read_verilog -lib +/ice40/cells_sim.v\n");
  72                 log("        hierarchy -check -top <top>\n");
  73                 log("\n");
  74                 log("    flatten:         (only if -flatten)\n");
  75                 log("        proc\n");
  76                 log("        flatten\n");
  77                 log("\n");
  78                 log("    coarse:\n");
  79                 log("        synth -run coarse\n");
  80                 log("\n");
  81                 log("    bram:            (skip if -nobram)\n");
  82                 log("        memory_bram -rules +/ice40/brams.txt\n");
  83                 log("        techmap -map +/ice40/brams_map.v\n");
  84                 log("\n");
  85                 log("    fine:\n");
  86                 log("        opt -fast -mux_undef -undriven -fine\n");
  87                 log("        memory_map\n");
  88                 log("        opt -undriven -fine\n");
  89                 log("        techmap -map +/techmap.v [-map +/ice40/arith_map.v]\n");
  90                 log("        abc -dff     (only if -retime)\n");
  91                 log("        ice40_opt\n");
  92                 log("\n");
  93                 log("    map_ffs:\n");
  94                 log("        dff2dffe -direct-match $_DFF_*\n");
  95                 log("        techmap -map +/ice40/cells_map.v\n");
  96                 log("        opt_const -mux_undef\n");
  97                 log("        simplemap\n");
  98                 log("        ice40_ffssr\n");
  99                 log("        ice40_opt -full\n");
 100                 log("\n");
 101                 log("    map_luts:\n");
 102                 log("        abc -lut 4\n");
 103                 log("        clean\n");
 104                 log("\n");
 105                 log("    map_cells:\n");
 106                 log("        techmap -map +/ice40/cells_map.v\n");
 107                 log("        clean\n");
 108                 log("\n");
 109                 log("    check:\n");
 110                 log("        hierarchy -check\n");
 111                 log("        stat\n");
 112                 log("        check -noinit\n");
 113                 log("\n");
 114         }
 115         virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
 116         {
 117                 std::string top_opt = "-auto-top";
 118                 std::string run_from, run_to;
 119                 bool nocarry = false;
 120                 bool nobram = false;
 121                 bool flatten = false;
 122                 bool retime = false;
 123
 124                 size_t argidx;
 125                 for (argidx = 1; argidx < args.size(); argidx++)
 126                 {
 127                         if (args[argidx] == "-top" && argidx+1 < args.size()) {
 128                                 top_opt = "-top " + args[++argidx];
 129                                 continue;
 130                         }
 131                         if (args[argidx] == "-run" && argidx+1 < args.size()) {
 132                                 size_t pos = args[argidx+1].find(':');
 133                                 if (pos == std::string::npos)
 134                                         break;
 135                                 run_from = args[++argidx].substr(0, pos);
 136                                 run_to = args[argidx].substr(pos+1);
 137                                 continue;
 138                         }
 139                         if (args[argidx] == "-flatten") {
 140                                 flatten = true;
 141                                 continue;
 142                         }
 143                         if (args[argidx] == "-retime") {
 144                                 retime = true;
 145                                 continue;
 146                         }
 147                         if (args[argidx] == "-nocarry") {
 148                                 nocarry = true;
 149                                 continue;
 150                         }
 151                         if (args[argidx] == "-nobram") {
 152                                 nobram = true;
 153                                 continue;
 154                         }
 155                         break;
 156                 }
 157                 extra_args(args, argidx, design);
 158
 159                 if (!design->full_selection())
 160                         log_cmd_error("This comannd only operates on fully selected designs!\n");
 161
 162                 bool active = run_from.empty();
 163
 164                 log_header("Executing SYNTH_ICE40 pass.\n");
 165                 log_push();
 166
 167                 if (check_label(active, run_from, run_to, "begin"))
 168                 {
 169                         Pass::call(design, "read_verilog -lib +/ice40/cells_sim.v");
 170                         Pass::call(design, stringf("hierarchy -check %s", top_opt.c_str()));
 171                 }
 172
 173                 if (flatten && check_label(active, run_from, run_to, "flatten"))
 174                 {
 175                         Pass::call(design, "proc");
 176                         Pass::call(design, "flatten");
 177                 }
 178
 179                 if (check_label(active, run_from, run_to, "coarse"))
 180                 {
 181                         Pass::call(design, "synth -run coarse");
 182                 }
 183
 184                 if (!nobram && check_label(active, run_from, run_to, "bram"))
 185                 {
 186                         Pass::call(design, "memory_bram -rules +/ice40/brams.txt");
 187                         Pass::call(design, "techmap -map +/ice40/brams_map.v");
 188                 }
 189
 190                 if (check_label(active, run_from, run_to, "fine"))
 191                 {
 192                         Pass::call(design, "opt -fast -mux_undef -undriven -fine");
 193                         Pass::call(design, "memory_map");
 194                         Pass::call(design, "opt -undriven -fine");
 195                         if (nocarry)
 196                                 Pass::call(design, "techmap");
 197                         else
 198                                 Pass::call(design, "techmap -map +/techmap.v -map +/ice40/arith_map.v");
 199                         if (retime)
 200                                 Pass::call(design, "abc -dff");
 201                         Pass::call(design, "ice40_opt");
 202                 }
 203
 204                 if (check_label(active, run_from, run_to, "map_ffs"))
 205                 {
 206                         Pass::call(design, "dff2dffe -direct-match $_DFF_*");
 207                         Pass::call(design, "techmap -map +/ice40/cells_map.v");
 208                         Pass::call(design, "opt_const -mux_undef");
 209                         Pass::call(design, "simplemap");
 210                         Pass::call(design, "ice40_ffssr");
 211                         Pass::call(design, "ice40_opt -full");
 212                 }
 213
 214                 if (check_label(active, run_from, run_to, "map_luts"))
 215                 {
 216                         Pass::call(design, "abc -lut 4");
 217                         Pass::call(design, "clean");
 218                 }
 219
 220                 if (check_label(active, run_from, run_to, "map_cells"))
 221                 {
 222                         Pass::call(design, "techmap -map +/ice40/cells_map.v");
 223                         Pass::call(design, "clean");
 224                 }
 225
 226                 if (check_label(active, run_from, run_to, "check"))
 227                 {
 228                         Pass::call(design, "hierarchy -check");
 229                         Pass::call(design, "stat");
 230                         Pass::call(design, "check -noinit");
 231                 }
 232
 233                 log_pop();
 234         }
 235 } SynthIce40Pass;
 236
 237 PRIVATE_NAMESPACE_END