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/*
 * Milkymist VJ SoC
 * Copyright (C) 2007, 2008, 2009 Sebastien Bourdeauducq
 *
 * This program is free and excepted software; you can use it, redistribute it
 * and/or modify it under the terms of the Exception General Public License as
 * published by the Exception License Foundation; either version 2 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 Exception General Public License for more
 * details.
 *
 * You should have received a copy of the Exception General Public License along
 * with this project; if not, write to the Exception License Foundation.
 */
 
module tmu_perfcounters(
	input sys_clk,
	input sys_rst,
 
	input start,
	input busy,
 
	input inc_pixels,
 
	input stb1,
	input ack1,
 
	input stb2,
	input ack2,
 
	input inc_misses,
 
	output reg [31:0] perf_pixels,
	output reg [31:0] perf_clocks,
 
	output reg [31:0] perf_stall1,
	output reg [31:0] perf_complete1,
	output reg [31:0] perf_stall2,
	output reg [31:0] perf_complete2,
 
	output reg [31:0] perf_misses
);
 
always @(posedge sys_clk) begin
	if(sys_rst|start) begin
		perf_pixels <= 32'd0;
		perf_clocks <= 32'd0;
	end else begin
		if(busy) perf_clocks <= perf_clocks + 32'd1;
		if(inc_pixels) perf_pixels <= perf_pixels + 32'd1;
	end
end
 
always @(posedge sys_clk) begin
	if(sys_rst|start) begin
		perf_stall1 <= 32'd0;
		perf_complete1 <= 32'd0;
	end else begin
		if(stb1) begin
			if(ack1)
				perf_complete1 <= perf_complete1 + 32'd1;
			else
				perf_stall1 <= perf_stall1 + 32'd1;
		end
	end
end
 
always @(posedge sys_clk) begin
	if(sys_rst|start) begin
		perf_stall2 <= 32'd0;
		perf_complete2 <= 32'd0;
	end else begin
		if(stb2) begin
			if(ack2)
				perf_complete2 <= perf_complete2 + 32'd1;
			else
				perf_stall2 <= perf_stall2 + 32'd1;
		end
	end
end
 
always @(posedge sys_clk) begin
	if(sys_rst|start)
		perf_misses <= 32'd0;
	else if(inc_misses)
		perf_misses <= perf_misses + 32'd1;
end
 
endmodule