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Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/keywrap_mkmif.v | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/src/rtl/keywrap_mkmif.v b/src/rtl/keywrap_mkmif.v new file mode 100644 index 0000000..bb08921 --- /dev/null +++ b/src/rtl/keywrap_mkmif.v @@ -0,0 +1,258 @@ +//====================================================================== +// +// keywrap_mkmif.v +// --------------- +// Wrapper for the mkmif_core. This allow us to simplify the +// integration of the mkmif in keywrap_core. +// +// +// Author: Joachim Strombergson +// Copyright (c) 2018, NORDUnet A/S +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// - Redistributions of source code must retain the above copyright notice, +// this list of conditions and the following disclaimer. +// +// - Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// +// - Neither the name of the NORDUnet nor the names of its contributors may +// be used to endorse or promote products derived from this software +// without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS +// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED +// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED +// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR +// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF +// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING +// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +//====================================================================== + +module keywrap_mkmif ( + input wire clk, + input wire reset_n, + + output wire mkm_spi_sclk, + output wire mkm_spi_cs_n, + input wire mkm_spi_do, + output wire mkm_spi_di, + + input wire init, + input wire read, + input wire write, + input wire key_status, + output wire ready, + + input wire [31 : 0] wr_status, + output wire [31 : 0] rd_status, + input wire [255 : 0] wr_key, + output wire [255 : 0] rd_key + ); + + + //---------------------------------------------------------------- + // Paramenters and local defines. + //---------------------------------------------------------------- + localparam CTRL_IDLE = 4'h0; + localparam CTRL_INIT_WAIT = 4'h1; + localparam CTRL_NEXT_WSTART = 4'h2; + localparam CTRL_NEXT_USTART = 4'h3; + localparam CTRL_NEXT_LOOP0 = 4'h4; + localparam CTRL_NEXT_LOOP = 4'h5; + localparam CTRL_NEXT_WAIT = 4'h6; + localparam CTRL_NEXT_UPDATE = 4'h7; + localparam CTRL_NEXT_WCHECK = 4'h8; + localparam CTRL_NEXT_UCHECK = 4'h9; + localparam CTRL_NEXT_FINALIZE = 4'ha; + + // Addresses for storage in the mkm + localparam MKM_STATUS_WORD = 16'h00; + localparam MKM_KEY_BASE_WORD = 16'h04; + + localparam DEFAULT_SCLK_DIV = 16'h0020; + + + //---------------------------------------------------------------- + // Registers and memories including control signals. + //---------------------------------------------------------------- + reg [31 : 0] key_reg [0 : 7]; + reg key_we; + + reg [2 : 0] key_word_ctr_reg; + reg [2 : 0] key_word_ctr_new; + reg key_word_ctr_we; + reg key_word_ctr_rst; + reg key_word_ctr_inc; + + reg [31 : 0] status_reg; + reg [31 : 0] status_new; + reg status_we; + + reg ready_reg; + reg ready_new; + reg ready_we; + + reg [3 : 0] keywrap_mkmif_ctrl_reg; + reg [3 : 0] keywrap_mkmif_ctrl_new; + reg keywrap_mkmif_ctrl_we; + + + //---------------------------------------------------------------- + // Wires. + //---------------------------------------------------------------- + reg mkm_init_op; + reg mkm_read_op; + reg mkm_write_op; + wire mkm_ready; + wire mkm_valid; + reg [15 : 0] mkm_sclk_div; + reg [15 : 0] mkm_addr; + reg [31 : 0] mkm_write_data; + wire [31 : 0] mkm_read_data; + + + //---------------------------------------------------------------- + // Instantiations. + //---------------------------------------------------------------- + mkmif_core mkm( + .clk(clk), + .reset_n(reset_n), + + .spi_sclk(mkm_spi_sclk), + .spi_cs_n(mkm_spi_cs_n), + .spi_do(mkm_spi_do), + .spi_di(mkm_spi_di), + + .init_op(mkm_init_op), + .read_op(mkm_read_op), + .write_op(mkm_write_op), + + .ready(mkm_ready), + .valid(mkm_valid), + + .sclk_div(mkm_sclk_div), + .addr(mkm_addr), + .write_data(mkm_write_data), + .read_data(mkm_read_data) + ); + + + //---------------------------------------------------------------- + // Assignments for ports. + //---------------------------------------------------------------- + + + //---------------------------------------------------------------- + // reg_update + //---------------------------------------------------------------- + always @ (posedge clk or negedge reset_n) + begin: reg_update + integer i; + + if (!reset_n) + begin + for (i = 0 ; i < 8 ; i = i + 1) + key[i] <= 32'h0; + + ready_reg <= 1'h1; + status_reg <= 32'h0; + key_word_ctr_reg <= 3'h0; + keywrap_mkmif_ctrl_reg <= CTRL_IDLE; + end + + else + begin + if (ready_we) + ready_reg <= ready_new; + + if (key_we) + key_reg[key_word_ctr_reg] <= mkm_read_data; + + if (status_we) + status_reg <= mkm_read_data; + + if (key_word_ctr_we) + key_word_ctr_reg <= key_word_ctr_new; + + if (keywrap_mkmif_ctrl_we) + keywrap_mkmif_ctrl_reg <= keywrap_mkmif_ctrl_new; + end + end // reg_update + + + //---------------------------------------------------------------- + // key_word_ctr + //---------------------------------------------------------------- + always @* + begin : key_word_ctr + key_word_ctr_new = 3'h0; + key_word_ctr_we = 1'h0; + + if (key_word_ctr_rst) + begin + iteration_ctr_new = 3'h0; + iteration_ctr_we = 1'h1; + end + + if (key_word_ctr_inc) + begin + key_word_ctr_new = key_word_ctr_reg + 1'h1; + key_word_ctr_we = 1'h1; + end + + end + + + //---------------------------------------------------------------- + // keywrap_mkmif_ctrl + //---------------------------------------------------------------- + always @* + begin : keywrap_mkmif_ctrl + ready_new = 1'h0; + ready_we = 1'h0; + key_we = 1'h0; + key_word_ctr_rst = 1'h0; + key_word_ctr_inc = 1'h0; + status_we = 1'h0; + mkm_init_op = 1'h0; + mkm_read_op = 1'h0; + mkm_write_op = 1'h0; + mkm_sclk_div = DEFAULT_SCLK_DIV; + mkm_addr = 16'h0; + mkm_write_data = 32'h0; + + keywrap_mkmif_ctrl_new = CTRL_IDLE; + keywrap_mkmif_ctrl_we = 1'h0; + + case (keywrap_mkmif_ctrl_reg) + CTRL_IDLE: + begin + if (init) + begin + ready_new = 1'h0; + ready_we = 1'h1; + end + end + + default: + begin + + end + endcase // case (keywrap_mkmif_ctrl_reg) + end // keywrap_mkmif_ctrl + +endmodule // keywrap_mkmif + +//====================================================================== +// EOF keywrap_mkmif.v +//====================================================================== |