Subversion Repositories soc_maker

###############################################################

#

#  File:      hdl_coder.rb

#

#  Author:    Christian Hättich

#

#  Project:   System-On-Chip Maker

#

#  Target:    Linux / Windows / Mac

#

#  Language:  ruby

#

#

###############################################################

#

#

#   Copyright (C) 2014  Christian Hättich  - feddischson [ at ] opencores.org

#

#   This program is free software: you can redistribute it and/or modify

#   it under the terms of the GNU General Public License as published by

#   the Free Software Foundation, either version 3 of the License, or

#   (at your option) any later version.

#

#   This program is distributed in the hope that it will be useful,

#   but WITHOUT ANY WARRANTY; without even the implied warranty of

#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#   GNU General Public License for more details.

#

#   You should have received a copy of the GNU General Public License

#   along with this program.  If not, see .

#

#

###############################################################

#

#   Description:

#     This file contains two HDL-coders:

#      - VHDLCoder

#      - VerilogCoder (not implemented, yet)

#

#

#

###############################################################

module SOCMaker

class HDLCoder

  def initialize

    @decl_part  = "";   # declaration

    @asgn_part  = "";   # assignment

    @inst_part  = "";   # instantiation

  end

end

class VerilogCoder < HDLCoder

  #TODO

end

class VHDLCoder < HDLCoder

  #

  # Add a component declaration to the declaration-string @decl_part

  # This for example looks like

  # component <> is

  #  generic(

  #    g1 : ...

  #    g2 : ...

  #    ...

  #    );

  #  port(

  #    p1 : ...

  #    p2 : ...

  #    p3 : ...

  #    ...

  #    )

  #  end component <>;

  #

  # In addition, we add some VHDL comments (author, mail, license)

  #

  def add_core_declaration( core_name, core_spec )

    @decl_part << "--\n"

    @decl_part << "-- core author: #{core_spec.author} - #{core_spec.authormail}\n"

    @decl_part << "-- license: #{core_spec.license}\n"

    @decl_part << "--\n"

    @decl_part << "component #{core_spec.toplevel} is\n"

    generic_str = entity_generic_str( core_spec );

    @decl_part << "generic ( #{ generic_str  });\n" if generic_str.size > 0

    @decl_part << "port( \n" << entity_port_str( core_spec ) <<" );\n"

    @decl_part << "end component #{core_spec.toplevel};\n"

    entity_generic_str( core_spec )

  end

  def entity_generic_str( core )

    generic_str = ""

    core.generics do |gen_name, gen_type, gen_val, is_last|

      generic_str     << gen_name << " : " << gen_type << " := " << gen_val.to_s

      generic_str     << ";" unless is_last

      generic_str     << "\n"

    end

    return generic_str

  end

  #

  # Create a string, which lists all signals of 'core'

  # We iterate over all interface:

  # For each interface, we iterate over all ports:

  # For each port, we lookup the definition in the 'soc_lib' and

  # add the VHDL code according to the definition as string to

  # port_string

  #

  def entity_port_str( core )

    port_string = ""

    core.ports do |port_name, port_dir, port_len, is_last |

      # The string we are add in every iteration looks for example like

      #    myportname1 :  out std_logic_vector( 6-1 downto 0 )

      #    or

      #    myportname2 :  in  std_logic

      #

      port_string << port_name.to_s << " : "

      # port direction

      if    port_dir == 2

        port_string << " inout "

      elsif port_dir == 1

        port_string << " in "

      else

        port_string << " out "

      end

      # port type / length

      if(   port_len.is_a?( String ) ||

          ( port_len.is_a?( Fixnum ) && port_len > 1 )

        )

        port_string << " std_logic_vector( #{port_len}-1 downto 0 ) "

      elsif ( port_len.is_a?( Fixnum ) && port_len == 1 )

        port_string << " std_logic "

      else

        puts "FAILED " + port_len

      end

      # end of the line

      port_string << ";" unless is_last

      port_string << "\n"

    end

    return port_string

  end

  def add_core_inst( inst_name, inst )

    @inst_part << inst_name << " : " << inst.defn.toplevel << "\n"

    generic_str = ""

    inst.generics do |generic, type, value, is_last|

      generic_str << "#{generic} => #{value}"

      generic_str << "," unless is_last

      generic_str << "\n"

    end

    @inst_part << "generic map( \n#{generic_str} )\n" if generic_str.size > 0

    port_str = ""

    inst.ports do |port_name, length, dir, is_last|

      port_str << "#{port_name} => #{inst_name}_#{port_name}"

      port_str << "," unless is_last

      port_str << "\n"

      if length > 1

        @decl_part << "signal #{inst_name}_#{port_name} : std_logic_vector( #{length}-1 downto 0 );\n"

      else

        @decl_part << "signal #{inst_name}_#{port_name} : std_logic;\n"

      end

    end

    @inst_part << "port map( \n#{port_str} );\n\n\n" if port_str.size > 0

  end

  def ifc_declaration( ifc_spec, ifc_name, length )

    ifc_spec.ports.each do |port_name, port|

      @decl_part << "signal #{ifc_name}_#{port_name.to_s} : "

      if length[ port_name ] > 1

        @decl_part << " std_logic_vector( #{length[ port_name ]}-1 downto 0 ) "

      else

        @decl_part << " std_logic "

      end

      # end of the line

      @decl_part << ";\n"

    end

  end

  def ifc_assignment( ifc_spec, ifc_name, length, src_inst, dst_inst, src_ifc, dst_ifc )

    ifc_spec.ports.each do |port_name, port_dir|

      if port_dir == 0

        src_inst_sel = src_inst

        dst_inst_sel = dst_inst

        src_ifc_sel  = src_ifc

        dst_ifc_sel  = dst_ifc

      else

        src_inst_sel = dst_inst

        dst_inst_sel = src_inst

        src_ifc_sel  = dst_ifc

        dst_ifc_sel  = src_ifc

      end

      port_tmp_name = "#{ifc_name}_#{port_name.to_s}"

      # combine all sources

      tmp = "#{port_tmp_name} <= "

      # loop over instances

      src_inst_sel.each_with_index do |(inst_name, inst), i|

        ( tmp_name, port) = inst.get_port( src_ifc_sel[ inst_name ], port_name )

        tmp << "\"" + "0" * ( length[ port_name ] - port[ :len ] ) + "\" & "  if port[ :len ] < length[ port_name ]

        tmp << "#{inst_name}_#{tmp_name}"

        tmp << " and \n" unless i == src_inst_sel.size-1

      end

      tmp << ";\n"

      @asgn_part << tmp

      # assign to destination

      tmp = ""

      dst_inst_sel.each_with_index do |(inst_name, inst), i|

        ( tmp_name, port) = inst.get_port( dst_ifc_sel[ inst_name ], port_name )

        tmp << "#{inst_name}_#{tmp_name} <= #{port_tmp_name}"

        tmp << "( #{port[ :len ]}-1 downto 0 )" if port[ :len ] > 1

        tmp << ";\n"

      end

      @asgn_part << tmp

    end

  end

  # TODO: add sig list as argument (or interface list) for entity description

  def get_entity( soc, entity_name )

    entity_str = SOCMaker::conf[ :LIC ].split(/\n/).map{ |s| "-- "+s }.join("\n")

    entity_str << "-- Auto-Generated by #{SOCMaker::conf[ :app_name ]} \n"

    entity_str << "-- Date: #{Time.now}\n"

    entity_str << SOCMaker::conf[ :vhdl_include ] + "\n"

    entity_str << "entity #{entity_name} is \n"

    tmp = entity_port_str( soc )

    entity_str << "port( \n" << tmp << " );\n" if tmp.size > 0

    entity_str << "end entity #{entity_name};\n\n\n"

    entity_str << "ARCHITECTURE IMPL of #{entity_name} is \n"

    entity_str << @decl_part

    entity_str << "\n\n"

    entity_str << "begin"

    entity_str << "\n\n"

    entity_str << "--"

    entity_str << "-- assignments "

    entity_str << "--"

    entity_str << "\n\n"

    entity_str << @asgn_part

    entity_str << "\n\n"

    entity_str << "--"

    entity_str << "-- instances "

    entity_str << "--"

    entity_str << "\n\n"

    entity_str << @inst_part

    entity_str << "end ARCHITECTURE IMPL;"

    return entity_str

  end

  def asgn_str( ifc_spec, con,  ifc_name, core1, core1_name, core2, core2_name )

    port_string = ""

    { core1 => [ con[ :ifc1 ], :src1 ],

      core2 => [ con[ :ifc2 ], :src2 ] }.each do| core, tmp |

      core.ports( tmp[0] ) do | port_spec_name, port_name, port_dir |

        if port_dir  == 0

          port_string << "#{ifc_name}_#{port_spec_name}"

          port_string << " <= "

          port_string << "#{con[ tmp[1] ]}_#{port_name}"

          port_string << ";\n"

        else

          port_string << "#{con[ tmp[1] ]}_#{port_name}"

          port_string << " <= "

          port_string << "#{ifc_name}_#{port_spec_name }"

          port_string << ";\n"

        end

      end

    end

    return port_string

  end

end

end

# vim: noai:ts=2:sw=2