#!/usr/bin/env python
"""
Generates an AXI Stream demux wrapper with the specified number of ports
"""

import argparse
from jinja2 import Template


def main():
    parser = argparse.ArgumentParser(description=__doc__.strip())
    parser.add_argument('-p', '--ports',  type=int, default=4, help="number of ports")
    parser.add_argument('-n', '--name',   type=str, help="module name")
    parser.add_argument('-o', '--output', type=str, help="output file name")

    args = parser.parse_args()

    try:
        generate(**args.__dict__)
    except IOError as ex:
        print(ex)
        exit(1)


def generate(ports=4, name=None, output=None):
    n = ports

    if name is None:
        name = "axis_demux_wrap_{0}".format(n)

    if output is None:
        output = name + ".v"

    print("Generating {0} port AXI stream demux wrapper {1}...".format(n, name))

    cn = (n-1).bit_length()

    t = Template(u"""/*

Copyright (c) 2018-2021 Alex Forencich

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

*/

// Language: Verilog 2001

`resetall
`timescale 1ns / 1ps
`default_nettype none

/*
 * AXI4-Stream {{n}} port demux (wrapper)
 */
module {{name}} #
(
    // Width of AXI stream interfaces in bits
    parameter DATA_WIDTH = 8,
    // Propagate tkeep signal
    parameter KEEP_ENABLE = (DATA_WIDTH>8),
    // tkeep signal width (words per cycle)
    parameter KEEP_WIDTH = ((DATA_WIDTH+7)/8),
    // Propagate tid signal
    parameter ID_ENABLE = 0,
    // tid signal width
    parameter ID_WIDTH = 8,
    // Propagate tdest signal
    parameter DEST_ENABLE = 0,
    // output tdest signal width
    parameter M_DEST_WIDTH = 1,
    // input tdest signal width
    parameter S_DEST_WIDTH = M_DEST_WIDTH+{{cn}},
    // Propagate tuser signal
    parameter USER_ENABLE = 1,
    // tuser signal width
    parameter USER_WIDTH = 1,
    // route via tdest
    parameter TDEST_ROUTE = 0
)
(
    input  wire                     clk,
    input  wire                     rst,

    /*
     * AXI Stream input
     */
    input  wire [DATA_WIDTH-1:0]    s_axis_tdata,
    input  wire [KEEP_WIDTH-1:0]    s_axis_tkeep,
    input  wire                     s_axis_tvalid,
    output wire                     s_axis_tready,
    input  wire                     s_axis_tlast,
    input  wire [ID_WIDTH-1:0]      s_axis_tid,
    input  wire [S_DEST_WIDTH-1:0]  s_axis_tdest,
    input  wire [USER_WIDTH-1:0]    s_axis_tuser,

    /*
     * AXI Stream outputs
     */
{%- for p in range(n) %}
    output wire [DATA_WIDTH-1:0]    m{{'%02d'%p}}_axis_tdata,
    output wire [KEEP_WIDTH-1:0]    m{{'%02d'%p}}_axis_tkeep,
    output wire                     m{{'%02d'%p}}_axis_tvalid,
    input  wire                     m{{'%02d'%p}}_axis_tready,
    output wire                     m{{'%02d'%p}}_axis_tlast,
    output wire [ID_WIDTH-1:0]      m{{'%02d'%p}}_axis_tid,
    output wire [M_DEST_WIDTH-1:0]  m{{'%02d'%p}}_axis_tdest,
    output wire [USER_WIDTH-1:0]    m{{'%02d'%p}}_axis_tuser,
{% endfor %}
    /*
     * Control
     */
    input  wire                     enable,
    input  wire                     drop,
    input  wire [{{cn-1}}:0]               select
);

axis_demux #(
    .M_COUNT({{n}}),
    .DATA_WIDTH(DATA_WIDTH),
    .KEEP_ENABLE(KEEP_ENABLE),
    .KEEP_WIDTH(KEEP_WIDTH),
    .ID_ENABLE(ID_ENABLE),
    .ID_WIDTH(ID_WIDTH),
    .DEST_ENABLE(DEST_ENABLE),
    .S_DEST_WIDTH(S_DEST_WIDTH),
    .M_DEST_WIDTH(M_DEST_WIDTH),
    .USER_ENABLE(USER_ENABLE),
    .USER_WIDTH(USER_WIDTH),
    .TDEST_ROUTE(TDEST_ROUTE)
)
axis_demux_inst (
    .clk(clk),
    .rst(rst),
    // AXI inputs
    .s_axis_tdata(s_axis_tdata),
    .s_axis_tkeep(s_axis_tkeep),
    .s_axis_tvalid(s_axis_tvalid),
    .s_axis_tready(s_axis_tready),
    .s_axis_tlast(s_axis_tlast),
    .s_axis_tid(s_axis_tid),
    .s_axis_tdest(s_axis_tdest),
    .s_axis_tuser(s_axis_tuser),
    // AXI output
    .m_axis_tdata({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tdata{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tkeep({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tkeep{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tvalid({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tvalid{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tready({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tready{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tlast({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tlast{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tid({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tid{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tdest({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tdest{% if not loop.last %}, {% endif %}{% endfor %} }),
    .m_axis_tuser({ {% for p in range(n-1,-1,-1) %}m{{'%02d'%p}}_axis_tuser{% if not loop.last %}, {% endif %}{% endfor %} }),
    // Control
    .enable(enable),
    .drop(drop),
    .select(select)
);

endmodule

`resetall

""")

    print(f"Writing file '{output}'...")

    with open(output, 'w') as f:
        f.write(t.render(
            n=n,
            cn=cn,
            name=name
        ))
        f.flush()

    print("Done")


if __name__ == "__main__":
    main()
