connect testharness components via member functions (#236)

to prevent code duplication for new testbenches

src/main/scala/junctions/jtag.scala

@@ -2,8 +2,7 @@ package junctions
 import Chisel._
 import cde.{Parameters}
 
-class JtagIO(drvTdo : Boolean = false) extends Bundle {
-
+class JTAGIO(drvTdo: Boolean = false) extends Bundle {
   val TCK = Clock(OUTPUT)
   val TMS = Bool(OUTPUT)
   val TDI = Bool(OUTPUT)
@@ -11,6 +10,5 @@ class JtagIO(drvTdo : Boolean = false) extends Bundle {
   val TRST = Bool(OUTPUT)
 
   val DRV_TDO = if (drvTdo) Some(Bool(INPUT)) else None
-  override def cloneType = new JtagIO(drvTdo).asInstanceOf[this.type]
-
+  override def cloneType = new JTAGIO(drvTdo).asInstanceOf[this.type]
 }

src/main/scala/rocketchip/DebugTransport.scala

@@ -39,7 +39,7 @@ class JtagDTMWithSync(implicit val p: Parameters) extends Module {
 
   val io = new Bundle {
 
-    val jtag = new JtagIO(true).flip()
+    val jtag = new JTAGIO(true).flip()
     val debug = new DebugBusIO()(p)
 
   }
@@ -105,7 +105,7 @@ class JtagDTMWithSync(implicit val p: Parameters) extends Module {
 class DebugTransportModuleJtag(reqSize : Int, respSize : Int)(implicit val p: Parameters)  extends BlackBox {
 
   val io = new Bundle {
-    val jtag = new JtagIO(true).flip()
+    val jtag = new JTAGIO(true).flip()
 
     val dtm_req = new DecoupledIO(UInt(width = reqSize))
 

src/main/scala/rocketchip/RocketChip.scala

@@ -97,7 +97,7 @@ class TopIO(implicit p: Parameters) extends BasicTopIO()(p) {
   val debug_clk = (p(AsyncDebugBus) && !p(IncludeJtagDTM)).option(Clock(INPUT))
   val debug_rst = (p(AsyncDebugBus) && !p(IncludeJtagDTM)).option(Bool(INPUT))
   val debug = (!p(IncludeJtagDTM)).option(new DebugBusIO()(p).flip)
-  val jtag  =      p(IncludeJtagDTM).option(new JtagIO(true).flip)
+  val jtag = p(IncludeJtagDTM).option(new JTAGIO(true).flip)
   val extra = p(ExtraTopPorts)(p)
 }
 

src/main/scala/rocketchip/TestHarness.scala

@@ -36,46 +36,17 @@ class TestHarness(implicit p: Parameters) extends Module {
       Module(new SimAXIMem(memSize / dut.io.mem_axi.size)).io.axi <> axi
   }
 
-  if (p(IncludeJtagDTM)) {
-    val jtag_vpi = Module (new JtagVpi)
-    dut.io.jtag.get <> jtag_vpi.io.jtag
-
-    // To be proper,
-    // TRST should really be synchronized
-    // with TCK. But this is a fairly
-    // accurate representation of how
-    // HW may drive this signal.
-    // Neither OpenOCD nor JtagVPI drive TRST.
-
-    dut.io.jtag.get.TRST := reset 
-    jtag_vpi.io.enable := ~reset
-    jtag_vpi.io.init_done := ~reset
-
-    // Success is determined by the gdbserver
-    // which is controlling this simulation.
-    io.success := Bool(false)
-  }
-  else {
-    val dtm = Module(new SimDTM)
-    dut.io.debug.get <> dtm.io.debug
-
+  if (!p(IncludeJtagDTM)) {
     // Todo: enable the usage of different clocks
     // to test the synchronizer more aggressively.
     val dtm_clock = clock
     val dtm_reset = reset
-
-    dtm.io.clk := dtm_clock
-    dtm.io.reset := dtm_reset
-    if (dut.io.debug_clk.isDefined)
-      dut.io.debug_clk.get := dtm_clock
-    if (dut.io.debug_rst.isDefined)
-      dut.io.debug_rst.get := dtm_reset
-
-    io.success := dut.io.success.getOrElse(dtm.io.exit === 1)
-    when (dtm.io.exit >= 2) {
-      printf("*** FAILED *** (exit code = %d)\n", dtm.io.exit >> 1)
-      stop(1)
-    }
+    if (dut.io.debug_clk.isDefined) dut.io.debug_clk.get := dtm_clock
+    if (dut.io.debug_rst.isDefined) dut.io.debug_rst.get := dtm_reset
+    val dtm = Module(new SimDTM).connect(dtm_clock, dtm_reset, dut.io.debug.get,
+      dut.io.success, io.success)
+  } else {
+    val jtag = Module(new JTAGVPI).connect(dut.io.jtag.get, reset, io.success)
   }
 
   for (bus_axi <- dut.io.bus_axi) {
@@ -154,14 +125,44 @@ class SimDTM(implicit p: Parameters) extends BlackBox {
     val debug = new uncore.devices.DebugBusIO
     val exit = UInt(OUTPUT, 32)
   }
+
+  def connect(tbclk: Clock, tbreset: Bool, dutio: uncore.devices.DebugBusIO,
+      dutsuccess: Option[Bool], tbsuccess: Bool) = {
+    io.clk := tbclk
+    io.reset := tbreset
+    dutio <> io.debug
+
+    tbsuccess := dutsuccess.getOrElse(io.exit === 1)
+    when (io.exit >= 2) {
+      printf("*** FAILED *** (exit code = %d)\n", io.exit >> 1)
+      stop(1)
+    }
+  }
 }
 
-
-class JtagVpi(implicit val p: Parameters) extends BlackBox {
-
+class JTAGVPI(implicit val p: Parameters) extends BlackBox {
   val io = new Bundle {
-    val jtag = new JtagIO(false)
+    val jtag = new JTAGIO(false)
     val enable = Bool(INPUT)
     val init_done = Bool(INPUT)
   }
+
+  def connect(dutio: JTAGIO, tbreset: Bool, tbsuccess: Bool) = {
+    dutio <> io.jtag
+
+    // To be proper,
+    // TRST should really be synchronized
+    // with TCK. But this is a fairly
+    // accurate representation of how
+    // HW may drive this signal.
+    // Neither OpenOCD nor JtagVPI drive TRST.
+
+    dutio.TRST := tbreset
+    io.enable := ~tbreset
+    io.init_done := ~tbreset
+
+    // Success is determined by the gdbserver
+    // which is controlling this simulation.
+    tbsuccess := Bool(false)
+  }
 }

vsrc/jtag_vpi.v

@@ -36,7 +36,7 @@
 `define CMD_SCAN_CHAIN_FLIP_TMS	3
 `define CMD_STOP_SIMU		4
 
-module JtagVpi
+module JTAGVPI
 #(	parameter DEBUG_INFO = 0,
 	parameter TP = 1,
 	parameter TCK_HALF_PERIOD = 2,// 50, // Clock half period (Clock period = 100 ns => 10 MHz)