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//
// Copyright 2011 Ettus Research LLC
//
// 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 <http://www.gnu.org/licenses/>.
//
module wb_reg
#(parameter ADDR=0,
parameter DEFAULT=0,
parameter WIDTH=32)
(input clk, input rst,
input [5:0] adr, input wr_acc,
input [31:0] dat_i, output reg [WIDTH-1:0] dat_o);
always @(posedge clk)
if(rst)
dat_o <= DEFAULT;
else if(wr_acc & (adr == ADDR))
dat_o <= dat_i[WIDTH-1:0];
endmodule // wb_reg
module simple_gemac_wb
(input wb_clk, input wb_rst,
input wb_cyc, input wb_stb, output reg wb_ack, input wb_we,
input [7:0] wb_adr, input [31:0] wb_dat_i, output reg [31:0] wb_dat_o,
inout mdio, output mdc,
output [47:0] ucast_addr, output [47:0] mcast_addr,
output pass_ucast, output pass_mcast, output pass_bcast,
output pass_pause, output pass_all,
output pause_respect_en, output pause_request_en,
output [15:0] pause_time, output [15:0] pause_thresh );
wire acc = wb_cyc & wb_stb;
wire wr_acc = wb_cyc & wb_stb & wb_we;
wire rd_acc = wb_cyc & wb_stb & ~wb_we;
always @(posedge wb_clk)
if(wb_rst)
wb_ack <= 0;
else
wb_ack <= acc & ~wb_ack;
wire [6:0] misc_settings;
assign {pause_request_en, pass_ucast, pass_mcast, pass_bcast, pass_pause, pass_all, pause_respect_en} = misc_settings;
wb_reg #(.ADDR(0),.DEFAULT(7'b0111011),.WIDTH(7))
wb_reg_settings (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(misc_settings) );
wb_reg #(.ADDR(1),.DEFAULT(0),.WIDTH(16))
wb_reg_ucast_h (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(ucast_addr[47:32]) );
wb_reg #(.ADDR(2),.DEFAULT(0),.WIDTH(32))
wb_reg_ucast_l (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(ucast_addr[31:0]) );
wb_reg #(.ADDR(3),.DEFAULT(0),.WIDTH(16))
wb_reg_mcast_h (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(mcast_addr[47:32]) );
wb_reg #(.ADDR(4),.DEFAULT(0),.WIDTH(32))
wb_reg_mcast_l (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(mcast_addr[31:0]) );
//MII to CPU
wire [7:0] Divider; // Divider for the host clock
wire [15:0] CtrlData; // Control Data (to be written to the PHY reg.)
wire [4:0] Rgad; // Register Address (within the PHY)
wire [4:0] Fiad; // PHY Address
wire NoPre; // No Preamble (no 32-bit preamble)
wire WCtrlData; // Write Control Data operation
wire RStat; // Read Status operation
wire ScanStat; // Scan Status operation
wire Busy; // Busy Signal
wire LinkFail; // Link Integrity Signal
wire Nvalid; // Invalid Status (qualifier for the valid scan result)
wire [15:0] Prsd; // Read Status Data (data read from the PHY)
wire WCtrlDataStart; // This signals resets the WCTRLDATA bit in the MIIM Command register
wire RStatStart; // This signal resets the RSTAT BIT in the MIIM Command register
wire UpdateMIIRX_DATAReg; // Updates MII RX_DATA register with read data
// registers for controlling the MII interface
reg [2:0] MIICOMMAND;
wire [12:0] MIIADDRESS;
reg [15:0] MIIRX_DATA;
wire [2:0] MIISTATUS;
wb_reg #(.ADDR(5),.DEFAULT(0),.WIDTH(9))
wb_reg_miimoder (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o({NoPre,Divider}) );
wb_reg #(.ADDR(6),.DEFAULT(0),.WIDTH(13))
wb_reg_miiaddr (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(MIIADDRESS) );
wb_reg #(.ADDR(7),.DEFAULT(0),.WIDTH(16))
wb_reg_miidata (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(CtrlData) );
// MIICOMMAND register - needs special treatment because of auto-resetting bits
always @ (posedge wb_clk)
if (wb_rst)
MIICOMMAND <= 0;
else
if (wr_acc & (wb_adr[7:2] == 6'd8))
MIICOMMAND <= wb_dat_i;
else
begin
if ( WCtrlDataStart )
MIICOMMAND[2] <= 0;
if ( RStatStart )
MIICOMMAND[1] <= 0;
end
// MIIRX_DATA register
always @(posedge wb_clk)
if (wb_rst)
MIIRX_DATA <= 0;
else
if (UpdateMIIRX_DATAReg )
MIIRX_DATA <= Prsd;
// MIICOMMAND
assign WCtrlData = MIICOMMAND[2];
assign RStat = MIICOMMAND[1];
assign ScanStat = MIICOMMAND[0];
// MIIADDRESS
assign Rgad = MIIADDRESS[12:8];
assign Fiad = MIIADDRESS[4:0];
// MIISTATUS
assign MIISTATUS[2:0] = { Nvalid, Busy, LinkFail };
eth_miim eth_miim
(.Clk(wb_clk), .Reset(wb_rst),
.Divider(Divider), .NoPre(NoPre), .CtrlData(CtrlData), .Rgad(Rgad), .Fiad(Fiad),
.WCtrlData(WCtrlData), .RStat(RStat), .ScanStat(ScanStat), .Mdio(mdio), .Mdc(mdc),
.Busy(Busy), .Prsd(Prsd), .LinkFail(LinkFail), .Nvalid(Nvalid),
.WCtrlDataStart(WCtrlDataStart), .RStatStart(RStatStart),
.UpdateMIIRX_DATAReg(UpdateMIIRX_DATAReg) );
wb_reg #(.ADDR(11),.DEFAULT(0),.WIDTH(16))
wb_reg_pausetime (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(pause_time) );
wb_reg #(.ADDR(12),.DEFAULT(0),.WIDTH(16))
wb_reg_pausethresh (.clk(wb_clk), .rst(wb_rst), .adr(wb_adr[7:2]), .wr_acc(wr_acc),
.dat_i(wb_dat_i), .dat_o(pause_thresh) );
always @(posedge wb_clk)
case(wb_adr[7:2])
0 : wb_dat_o <= misc_settings;
1 : wb_dat_o <= ucast_addr[47:32];
2 : wb_dat_o <= ucast_addr[31:0];
3 : wb_dat_o <= mcast_addr[47:32];
4 : wb_dat_o <= mcast_addr[31:0];
5 : wb_dat_o <= {NoPre,Divider};
6 : wb_dat_o <= MIIADDRESS;
7 : wb_dat_o <= CtrlData;
8 : wb_dat_o <= MIICOMMAND;
9 : wb_dat_o <= MIISTATUS;
10: wb_dat_o <= MIIRX_DATA;
11: wb_dat_o <= pause_time;
12: wb_dat_o <= pause_thresh;
endcase // case (wb_adr[7:2])
endmodule // simple_gemac_wb
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