techlibs/anlogic/anlogic_eqn.cc

   1 /*
   2  *  yosys -- Yosys Open SYnthesis Suite
   3  *
   4  *  Copyright (C) 2018  Miodrag Milanovic <miodrag@symbioticeda.com>
   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/yosys.h"
  21 #include "kernel/sigtools.h"
  22
  23 USING_YOSYS_NAMESPACE
  24 PRIVATE_NAMESPACE_BEGIN
  25
  26 struct AnlogicEqnPass : public Pass {
  27         AnlogicEqnPass() : Pass("anlogic_eqn", "Anlogic: Calculate equations for luts") { }
  28         void help() YS_OVERRIDE
  29         {
  30                 log("\n");
  31                 log("    anlogic_eqn [selection]\n");
  32                 log("\n");
  33                 log("Calculate equations for luts since bitstream generator depends on it.\n");
  34                 log("\n");
  35         }
  36
  37         Const init2eqn(Const init, int inputs)
  38         {
  39                 std::string init_bits = init.as_string();
  40                 const char* names[] = { "A" , "B", "C", "D", "E", "F" };
  41
  42                 std::string eqn;
  43                 int width = (int)pow(2,inputs);
  44                 for(int i=0;i<width;i++)
  45                 {
  46                         if (init_bits[width-1-i]=='1')
  47                         {
  48                                 eqn += "(";
  49                                 for(int j=0;j<inputs;j++)
  50                                 {
  51                                         if (i & (1<<j))
  52                                                 eqn += names[j];
  53                                         else
  54                                                 eqn += std::string("~") + names[j];
  55
  56                                         if (j!=(inputs-1)) eqn += "*";
  57                                 }
  58                                 eqn += ")+";
  59                         }
  60                 }
  61                 if (eqn.empty()) return Const("0");
  62                 eqn = eqn.substr(0, eqn.length()-1);
  63                 return Const(eqn);
  64         }
  65
  66         void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
  67         {
  68                 log_header(design, "Executing ANLOGIC_EQN pass (calculate equations for luts).\n");
  69
  70                 extra_args(args, args.size(), design);
  71
  72                 int cnt = 0;
  73                 for (auto module : design->selected_modules())
  74                 {
  75                         for (auto cell : module->selected_cells())
  76                         {
  77                                 if (cell->type == ID(AL_MAP_LUT1))
  78                                 {
  79                                         cell->setParam(ID(EQN), init2eqn(cell->getParam(ID::INIT),1));
  80                                         cnt++;
  81                                 }
  82                                 if (cell->type == ID(AL_MAP_LUT2))
  83                                 {
  84                                         cell->setParam(ID(EQN), init2eqn(cell->getParam(ID::INIT),2));
  85                                         cnt++;
  86                                 }
  87                                 if (cell->type == ID(AL_MAP_LUT3))
  88                                 {
  89                                         cell->setParam(ID(EQN), init2eqn(cell->getParam(ID::INIT),3));
  90                                         cnt++;
  91                                 }
  92                                 if (cell->type == ID(AL_MAP_LUT4))
  93                                 {
  94                                         cell->setParam(ID(EQN), init2eqn(cell->getParam(ID::INIT),4));
  95                                         cnt++;
  96                                 }
  97                                 if (cell->type == ID(AL_MAP_LUT5))
  98                                 {
  99                                         cell->setParam(ID(EQN), init2eqn(cell->getParam(ID::INIT),5));
 100                                         cnt++;
 101                                 }
 102                                 if (cell->type == ID(AL_MAP_LUT6))
 103                                 {
 104                                         cell->setParam(ID(EQN), init2eqn(cell->getParam(ID::INIT),6));
 105                                         cnt++;
 106                                 }
 107                         }
 108                 }
 109                 log_header(design, "Updated %d of AL_MAP_LUT* elements with equation.\n", cnt);
 110         }
 111 } AnlogicEqnPass;
 112
 113 PRIVATE_NAMESPACE_END