Create interrupt controller

hw/efinix_fpga/interrupt_controller.sv

@@ -0,0 +1,30 @@
+module interrupt_controller
+(
+    input clk,
+    input reset,
+    input [7:0] i_data,
+    output logic [7:0] o_data,
+    input cs,
+    input rwb,
+
+    output logic irqb_master,
+
+    input irqb0, irqb1, irqb2, irqb3,
+    input irqb4, irqb5, irqb6, irqb7
+);
+
+
+//All of the inputs are low level triggered.
+logic [7:0] irqbv;
+assign irqbv = {irqb0, irqb1, irqb2, irqb3, irqb4, irqb5, irqb6, irqb7};
+
+always @(posedge clk) begin
+    o_data <= irqbv;
+    irqb_master = &irqbv;
+
+    if (cs & ~rwb) begin
+        o_data <= o_data | i_data;
+    end
+end
+
+endmodule