wishbone_pkg.vhd

library ieee;

use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

library work;
use work.genram_pkg.all;

package wishbone_pkg is

  constant c_wishbone_address_width : integer := 32;
  constant c_wishbone_data_width    : integer := 32;

  subtype t_wishbone_address is
    std_logic_vector(c_wishbone_address_width-1 downto 0);
  subtype t_wishbone_data is
    std_logic_vector(c_wishbone_data_width-1 downto 0);
  subtype t_wishbone_byte_select is
    std_logic_vector((c_wishbone_address_width/8)-1 downto 0);
  subtype t_wishbone_cycle_type is
    std_logic_vector(2 downto 0);
  subtype t_wishbone_burst_type is
    std_logic_vector(1 downto 0);

  type t_wishbone_interface_mode is (CLASSIC, PIPELINED);
  type t_wishbone_address_granularity is (BYTE, WORD);

  type t_wishbone_master_out is record
    cyc : std_logic;
    stb : std_logic;
    adr : t_wishbone_address;
    sel : t_wishbone_byte_select;
    we  : std_logic;
    dat : t_wishbone_data;
  end record t_wishbone_master_out;

  subtype t_wishbone_slave_in is t_wishbone_master_out;

  type t_wishbone_slave_out is record
    ack   : std_logic;
    err   : std_logic;
    rty   : std_logic;
    stall : std_logic;
    int   : std_logic;
    dat   : t_wishbone_data;
  end record t_wishbone_slave_out;
  subtype t_wishbone_master_in is t_wishbone_slave_out;

  subtype t_wishbone_device_descriptor is std_logic_vector(255 downto 0);

  type t_wishbone_byte_select_array is array(natural range <>) of t_wishbone_byte_select; 
  type t_wishbone_data_array is array(natural range <>) of t_wishbone_data; 
  type t_wishbone_address_array is array(natural range <>) of t_wishbone_address;
  type t_wishbone_master_out_array is array (natural range <>) of t_wishbone_master_out;
  --type t_wishbone_slave_in_array is array (natural range <>) of t_wishbone_slave_in;
  subtype t_wishbone_slave_in_array is t_wishbone_master_out_array;
  type t_wishbone_slave_out_array is array (natural range <>) of t_wishbone_slave_out;
  --type t_wishbone_master_in_array is array (natural range <>) of t_wishbone_master_in;
  subtype t_wishbone_master_in_array is t_wishbone_slave_out_array;

  constant cc_dummy_address : std_logic_vector(c_wishbone_address_width-1 downto 0) :=
    (others => 'X');
  constant cc_dummy_data : std_logic_vector(c_wishbone_address_width-1 downto 0) :=
    (others => 'X');
  constant cc_dummy_sel : std_logic_vector(c_wishbone_data_width/8-1 downto 0) :=
    (others => 'X');
  constant cc_dummy_slave_in : t_wishbone_slave_in :=
    ('0', '0', cc_dummy_address, cc_dummy_sel, 'X', cc_dummy_data);
  constant cc_dummy_master_out : t_wishbone_master_out := cc_dummy_slave_in;

  -- Dangerous! Will stall a bus.
  constant cc_dummy_slave_out : t_wishbone_slave_out :=
    ('X', 'X', 'X', 'X', 'X', cc_dummy_data);
  constant cc_dummy_master_in : t_wishbone_master_in := cc_dummy_slave_out;

  constant cc_dummy_address_array : t_wishbone_address_array(0 downto 0) := (0 => cc_dummy_address);

  -- A generally useful function.
  function f_ceil_log2(x   : natural) return natural;
  function f_bits2string(s : std_logic_vector) return string;

  function f_string2bits(s : string) return std_logic_vector;
  function f_string2svl (s : string) return std_logic_vector;
  function f_slv2string (slv : std_logic_vector) return string;

  function f_string_fix_len( s : string; ret_len : natural := 10; fill_char : character := '0' ) return string;
  function f_hot_to_bin(x : std_logic_vector) return natural;
  
  -- *** Wishbone slave interface functions ***
  -- f_wb_wr:
  -- processes an incoming write reqest to a register while honoring the select lines
  -- valid modes are overwrite "owr", set "set" (bits are or'ed) and clear "clr" (bits are nand'ed)
  function f_wb_wr(pval : std_logic_vector; ival : std_logic_vector; sel : std_logic_vector; mode : string := "owr") return std_logic_vector;
------------------------------------------------------------------------------
-- SDB declaration
------------------------------------------------------------------------------

  constant c_sdb_device_length : natural := 512;  -- bits
  subtype  t_sdb_record is std_logic_vector(c_sdb_device_length-1 downto 0);
  type     t_sdb_record_array is array(natural range <>) of t_sdb_record;
  
  type t_sdb_product is record
    vendor_id : std_logic_vector(63 downto 0);
    device_id : std_logic_vector(31 downto 0);
    version   : std_logic_vector(31 downto 0);
    date      : std_logic_vector(31 downto 0);
    name      : string(1 to 19);
  end record t_sdb_product;

  type t_sdb_component is record
    addr_first : std_logic_vector(63 downto 0);
    addr_last  : std_logic_vector(63 downto 0);
    product    : t_sdb_product;
  end record t_sdb_component;

  constant c_sdb_endian_big    : std_logic := '0';
  constant c_sdb_endian_little : std_logic := '1';
  type     t_sdb_device is record
    abi_class     : std_logic_vector(15 downto 0);
    abi_ver_major : std_logic_vector(7 downto 0);
    abi_ver_minor : std_logic_vector(7 downto 0);
    wbd_endian    : std_logic;          -- 0 = big, 1 = little
    wbd_width     : std_logic_vector(3 downto 0);  -- 3=64-bit, 2=32-bit, 1=16-bit, 0=8-bit
    sdb_component : t_sdb_component;
  end record t_sdb_device;

  type t_sdb_bridge is record
    sdb_child     : std_logic_vector(63 downto 0);
    sdb_component : t_sdb_component;
  end record t_sdb_bridge;

  type t_sdb_integration is record
    product : t_sdb_product;
  end record t_sdb_integration;

  type t_sdb_repo_url is record
    repo_url : string(1 to 63);
  end record t_sdb_repo_url;

  type t_sdb_synthesis is record
    syn_module_name  : string(1 to 16);
    syn_commit_id    : string(1 to 32);
    syn_tool_name    : string(1 to 8);
    syn_tool_version : std_logic_vector(31 downto 0);
    syn_date         : std_logic_vector(31 downto 0);
    syn_username     : string(1 to 15);
  end record t_sdb_synthesis;
  

  -- general crossbar building functions
  function f_sdb_create_array(g_enum_dev_id  : boolean := false;
                              g_dev_id_offs    : natural := 0;
                              g_enum_dev_name  : boolean := false;
                              g_dev_name_offs  : natural := 0;       
                              device           : t_sdb_device; 
                              instances        : natural := 1) return t_sdb_record_array;  
  function f_sdb_join_arrays(a : t_sdb_record_array; b : t_sdb_record_array) return t_sdb_record_array;
  function f_sdb_extract_base_addr(sdb_record : t_sdb_record) return std_logic_vector;
  function f_sdb_extract_end_addr(sdb_record : t_sdb_record)  return std_logic_vector;
  function f_sdb_automap_array(sdb_array : t_sdb_record_array; start_offset : t_wishbone_address := (others => '0')) return t_sdb_record_array;  
  function f_align_addr_offset(offs : unsigned; this_rng : unsigned; prev_rng : unsigned) return unsigned; 
  function f_sdb_create_rom_addr(sdb_array : t_sdb_record_array) return t_wishbone_address;


  -- Used to configure a device at a certain address
  function f_sdb_embed_device(device : t_sdb_device; address : t_wishbone_address) return t_sdb_record;
  function f_sdb_embed_bridge(bridge : t_sdb_bridge; address : t_wishbone_address) return t_sdb_record;
  function f_sdb_embed_integration(integr : t_sdb_integration) return t_sdb_record;
  function f_sdb_embed_repo_url(url : t_sdb_repo_url) return t_sdb_record;
  function f_sdb_embed_synthesis(syn : t_sdb_synthesis) return t_sdb_record;

  function f_sdb_extract_device(sdb_record : t_sdb_record) return t_sdb_device;
  function f_sdb_extract_bridge(sdb_record : t_sdb_record) return t_sdb_bridge;
  function f_sdb_extract_integration(sdb_record : t_sdb_record) return t_sdb_integration;
  function f_sdb_extract_repo_url(sdb_record : t_sdb_record) return t_sdb_repo_url;
  function f_sdb_extract_synthesis(sdb_record : t_sdb_record) return t_sdb_synthesis;

  -- Automatic crossbar mapping functions
  function f_sdb_auto_device(device : t_sdb_device; enable : boolean := true) return t_sdb_record;
  function f_sdb_auto_bridge(bridge : t_sdb_bridge; enable : boolean := true) return t_sdb_record;
  function f_sdb_auto_layout(records : t_sdb_record_array) return t_sdb_record_array;
  function f_sdb_auto_sdb   (records : t_sdb_record_array) return t_wishbone_address;
  
  -- For internal use by the crossbar
  function f_sdb_embed_product(product         : t_sdb_product) return std_logic_vector;  -- (319 downto 8)
  function f_sdb_embed_component(sdb_component : t_sdb_component; address : t_wishbone_address) return std_logic_vector;  -- (447 downto 8)
  function f_sdb_extract_product(sdb_record    : std_logic_vector(319 downto 8)) return t_sdb_product;
  function f_sdb_extract_component(sdb_record  : std_logic_vector(447 downto 8)) return t_sdb_component;

------------------------------------------------------------------------------
-- Components declaration
-------------------------------------------------------------------------------

  component wb_slave_adapter
    generic (
      g_master_use_struct  : boolean;
      g_master_mode        : t_wishbone_interface_mode;
      g_master_granularity : t_wishbone_address_granularity;
      g_slave_use_struct   : boolean;
      g_slave_mode         : t_wishbone_interface_mode;