techlibs/ecp5/synth_ecp5.cc

   1 /*
   2  *  yosys -- Yosys Open SYnthesis Suite
   3  *
   4  *  Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
   5  *  Copyright (C) 2018 Clifford Wolf <dave@ds0.me>
   6  *
   7  *  Permission to use, copy, modify, and/or distribute this software for any
   8  *  purpose with or without fee is hereby granted, provided that the above
   9  *  copyright notice and this permission notice appear in all copies.
  10  *
  11  *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  12  *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  14  *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  *
  19  */
  20
  21 #include "kernel/register.h"
  22 #include "kernel/celltypes.h"
  23 #include "kernel/rtlil.h"
  24 #include "kernel/log.h"
  25
  26 USING_YOSYS_NAMESPACE
  27 PRIVATE_NAMESPACE_BEGIN
  28
  29 struct SynthEcp5Pass : public ScriptPass
  30 {
  31         SynthEcp5Pass() : ScriptPass("synth_ecp5", "synthesis for ECP5 FPGAs") { }
  32
  33         void help() YS_OVERRIDE
  34         {
  35                 //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
  36                 log("\n");
  37                 log("    synth_ecp5 [options]\n");
  38                 log("\n");
  39                 log("This command runs synthesis for ECP5 FPGAs.\n");
  40                 log("\n");
  41                 log("    -top <module>\n");
  42                 log("        use the specified module as top module\n");
  43                 log("\n");
  44                 log("    -blif <file>\n");
  45                 log("        write the design to the specified BLIF file. writing of an output file\n");
  46                 log("        is omitted if this parameter is not specified.\n");
  47                 log("\n");
  48                 log("    -edif <file>\n");
  49                 log("        write the design to the specified EDIF file. writing of an output file\n");
  50                 log("        is omitted if this parameter is not specified.\n");
  51                 log("\n");
  52                 log("    -json <file>\n");
  53                 log("        write the design to the specified JSON file. writing of an output file\n");
  54                 log("        is omitted if this parameter is not specified.\n");
  55                 log("\n");
  56                 log("    -run <from_label>:<to_label>\n");
  57                 log("        only run the commands between the labels (see below). an empty\n");
  58                 log("        from label is synonymous to 'begin', and empty to label is\n");
  59                 log("        synonymous to the end of the command list.\n");
  60                 log("\n");
  61                 log("    -noflatten\n");
  62                 log("        do not flatten design before synthesis\n");
  63                 log("\n");
  64                 log("    -retime\n");
  65                 log("        run 'abc' with -dff option\n");
  66                 log("\n");
  67                 log("    -noccu2\n");
  68                 log("        do not use CCU2 cells in output netlist\n");
  69                 log("\n");
  70                 log("    -nodffe\n");
  71                 log("        do not use flipflops with CE in output netlist\n");
  72                 log("\n");
  73                 log("    -nobram\n");
  74                 log("        do not use BRAM cells in output netlist\n");
  75                 log("\n");
  76                 log("    -nodram\n");
  77                 log("        do not use distributed RAM cells in output netlist\n");
  78                 log("\n");
  79                 log("    -nowidelut\n");
  80                 log("        do not use PFU muxes to implement LUTs larger than LUT4s\n");
  81                 log("\n");
  82                 log("    -abc2\n");
  83                 log("        run two passes of 'abc' for slightly improved logic density\n");
  84                 log("\n");
  85                 log("    -abc9\n");
  86                 log("        use new ABC9 flow (EXPERIMENTAL)\n");
  87                 log("\n");
  88                 log("    -vpr\n");
  89                 log("        generate an output netlist (and BLIF file) suitable for VPR\n");
  90                 log("        (this feature is experimental and incomplete)\n");
  91                 log("\n");
  92                 log("\n");
  93                 log("The following commands are executed by this synthesis command:\n");
  94                 help_script();
  95                 log("\n");
  96         }
  97
  98         string top_opt, blif_file, edif_file, json_file;
  99         bool noccu2, nodffe, nobram, nodram, nowidelut, flatten, retime, abc2, abc9, vpr;
 100
 101         void clear_flags() YS_OVERRIDE
 102         {
 103                 top_opt = "-auto-top";
 104                 blif_file = "";
 105                 edif_file = "";
 106                 json_file = "";
 107                 noccu2 = false;
 108                 nodffe = false;
 109                 nobram = false;
 110                 nodram = false;
 111                 nowidelut = false;
 112                 flatten = true;
 113                 retime = false;
 114                 abc2 = false;
 115                 vpr = false;
 116                 abc9 = false;
 117         }
 118
 119         void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
 120         {
 121                 string run_from, run_to;
 122                 clear_flags();
 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] == "-blif" && argidx+1 < args.size()) {
 132                                 blif_file = args[++argidx];
 133                                 continue;
 134                         }
 135                         if (args[argidx] == "-edif" && argidx+1 < args.size()) {
 136                                 edif_file = args[++argidx];
 137                                 continue;
 138                         }
 139                         if (args[argidx] == "-json" && argidx+1 < args.size()) {
 140                                 json_file = args[++argidx];
 141                                 continue;
 142                         }
 143                         if (args[argidx] == "-run" && argidx+1 < args.size()) {
 144                                 size_t pos = args[argidx+1].find(':');
 145                                 if (pos == std::string::npos)
 146                                         break;
 147                                 run_from = args[++argidx].substr(0, pos);
 148                                 run_to = args[argidx].substr(pos+1);
 149                                 continue;
 150                         }
 151                         if (args[argidx] == "-flatten") {
 152                                 flatten = true;
 153                                 continue;
 154                         }
 155                         if (args[argidx] == "-noflatten") {
 156                                 flatten = false;
 157                                 continue;
 158                         }
 159                         if (args[argidx] == "-retime") {
 160                                 retime = true;
 161                                 continue;
 162                         }
 163                         if (args[argidx] == "-noccu2") {
 164                                 noccu2 = true;
 165                                 continue;
 166                         }
 167                         if (args[argidx] == "-nodffe") {
 168                                 nodffe = true;
 169                                 continue;
 170                         }
 171                         if (args[argidx] == "-nobram") {
 172                                 nobram = true;
 173                                 continue;
 174                         }
 175                         if (args[argidx] == "-nodram") {
 176                                 nodram = true;
 177                                 continue;
 178                         }
 179                         if (args[argidx] == "-nowidelut" || args[argidx] == "-nomux") {
 180                                 nowidelut = true;
 181                                 continue;
 182                         }
 183                         if (args[argidx] == "-abc2") {
 184                                 abc2 = true;
 185                                 continue;
 186                         }
 187                         if (args[argidx] == "-vpr") {
 188                                 vpr = true;
 189                                 continue;
 190                         }
 191                         if (args[argidx] == "-abc9") {
 192                                 abc9 = true;
 193                                 continue;
 194                         }
 195                         break;
 196                 }
 197                 extra_args(args, argidx, design);
 198
 199                 if (!design->full_selection())
 200                         log_cmd_error("This command only operates on fully selected designs!\n");
 201
 202                 log_header(design, "Executing SYNTH_ECP5 pass.\n");
 203                 log_push();
 204
 205                 run_script(design, run_from, run_to);
 206
 207                 log_pop();
 208         }
 209
 210         void script() YS_OVERRIDE
 211         {
 212                 if (check_label("begin"))
 213                 {
 214                         run("read_verilog -D_ABC -lib +/ecp5/cells_sim.v +/ecp5/cells_bb.v");
 215                         run(stringf("hierarchy -check %s", help_mode ? "-top <top>" : top_opt.c_str()));
 216                 }
 217
 218                 if (flatten && check_label("flatten", "(unless -noflatten)"))
 219                 {
 220                         run("proc");
 221                         run("flatten");
 222                         run("tribuf -logic");
 223                         run("deminout");
 224                 }
 225
 226                 if (check_label("coarse"))
 227                 {
 228                         run("synth -run coarse");
 229                 }
 230
 231                 if (!nobram && check_label("bram", "(skip if -nobram)"))
 232                 {
 233                         run("memory_bram -rules +/ecp5/bram.txt");
 234                         run("techmap -map +/ecp5/brams_map.v");
 235                 }
 236
 237                 if (!nodram && check_label("dram", "(skip if -nodram)"))
 238                 {
 239                         run("memory_bram -rules +/ecp5/dram.txt");
 240                         run("techmap -map +/ecp5/drams_map.v");
 241                 }
 242
 243                 if (check_label("fine"))
 244                 {
 245                         run("opt -fast -mux_undef -undriven -fine");
 246                         run("memory_map");
 247                         run("opt -undriven -fine");
 248                         if (noccu2)
 249                                 run("techmap");
 250                         else
 251                                 run("techmap -map +/techmap.v -map +/ecp5/arith_map.v");
 252                         if (retime || help_mode)
 253                                 run("abc -dff", "(only if -retime)");
 254                 }
 255
 256                 if (check_label("map_ffs"))
 257                 {
 258                         run("dffsr2dff");
 259                         run("dff2dffs");
 260                         run("opt_clean");
 261                         if (!nodffe)
 262                                 run("dff2dffe -direct-match $_DFF_* -direct-match $__DFFS_*");
 263                         run("techmap -D NO_LUT -map +/ecp5/cells_map.v");
 264                         run("opt_expr -undriven -mux_undef");
 265                         run("simplemap");
 266                         run("ecp5_ffinit");
 267                 }
 268
 269                 if (check_label("map_luts"))
 270                 {
 271                         if (abc2 || help_mode) {
 272                                 run("abc", "      (only if -abc2)");
 273                         }
 274                         run("techmap -map +/ecp5/latches_map.v");
 275                         if (abc9) {
 276                                 if (nowidelut)
 277                                         run("abc9 -lut +/ecp5/abc_5g_nowide.lut -box +/ecp5/abc_5g.box -W 200");
 278                                 else
 279                                         run("abc9 -lut +/ecp5/abc_5g.lut -box +/ecp5/abc_5g.box -W 200");
 280                         } else {
 281                                 if (nowidelut)
 282                                         run("abc -lut 4 -dress");
 283                                 else
 284                                         run("abc -lut 4:7 -dress");
 285                         }
 286                         run("clean");
 287                 }
 288
 289                 if (check_label("map_cells"))
 290                 {
 291                         if (vpr)
 292                                 run("techmap -D NO_LUT -map +/ecp5/cells_map.v");
 293                         else
 294                                 run("techmap -map +/ecp5/cells_map.v", "(with -D NO_LUT in vpr mode)");
 295
 296                         run("clean");
 297                 }
 298
 299                 if (check_label("check"))
 300                 {
 301                         run("hierarchy -check");
 302                         run("stat");
 303                         run("check -noinit");
 304                 }
 305
 306                 if (check_label("blif"))
 307                 {
 308                         if (!blif_file.empty() || help_mode) {
 309                                 if (vpr || help_mode) {
 310                                         run(stringf("opt_clean -purge"),
 311                                                         "                                 (vpr mode)");
 312                                         run(stringf("write_blif -attr -cname -conn -param %s",
 313                                                         help_mode ? "<file-name>" : blif_file.c_str()),
 314                                                         " (vpr mode)");
 315                                 }
 316                                 if (!vpr)
 317                                         run(stringf("write_blif -gates -attr -param %s",
 318                                                         help_mode ? "<file-name>" : blif_file.c_str()),
 319                                                         "       (non-vpr mode)");
 320                         }
 321                 }
 322
 323                 if (check_label("edif"))
 324                 {
 325                         if (!edif_file.empty() || help_mode)
 326                                 run(stringf("write_edif %s", help_mode ? "<file-name>" : edif_file.c_str()));
 327                 }
 328
 329                 if (check_label("json"))
 330                 {
 331                         if (!json_file.empty() || help_mode)
 332                                 run(stringf("write_json %s", help_mode ? "<file-name>" : json_file.c_str()));
 333                 }
 334         }
 335 } SynthEcp5Pass;
 336
 337 PRIVATE_NAMESPACE_END