rfnoc: lib: introduce ctrl-port interface and BFM

Original-commit: 886cf97ad5d494b20c6fff0a53113f6096d458c7

lib/rfnoc/utils/ctrlport_if_window.sv

@@ -0,0 +1,45 @@
+//
+// Copyright 2025 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+// Module: ctrlport_if_window
+//
+// Description:
+//
+//   Copy requests from slave to master interface when s_ctrlport_req_addr is in
+//   address range specified by the parameters.
+//
+// Parameters:
+//
+//  BASE_ADDRESS : Base address of the window.
+//                 This will be the first address in the range.
+//  WINDOW_SIZE  : Size of the address space for the window.
+//                 Last address in range will be BASE_ADDRESS + WINDOW_SIZE - 1.
+//
+
+module ctrlport_if_window #(
+  int BASE_ADDRESS = 0,
+  int WINDOW_SIZE  = 32
+) (
+  ctrlport_if.slave s_ctrlport,
+  ctrlport_if.master m_ctrlport
+);
+
+  always_comb begin
+    // Mask write and read flag
+    automatic logic address_in_range = (s_ctrlport.req.addr >= BASE_ADDRESS) &&
+      (s_ctrlport.req.addr < BASE_ADDRESS + WINDOW_SIZE);
+
+    // initialize master request by slave request
+    m_ctrlport.req = s_ctrlport.req;
+
+    // overwrite write and read flag with in range flag
+    m_ctrlport.req.wr = s_ctrlport.req.wr && address_in_range;
+    m_ctrlport.req.rd = s_ctrlport.req.rd && address_in_range;
+
+    // transfer reponse without change
+    s_ctrlport.resp = m_ctrlport.resp;
+  end
+
+endmodule