Make it possible to adjust the type of pad controls used,

and seperate out some of the "GPIO Peripheral" from "Pin Control"

src/main/scala/devices/pinctrl/PinCtrl.scala

@@ -0,0 +1,96 @@
+//See LICENSE for license details
+
+package sifive.blocks.devices.pinctrl
+
+import Chisel._
+
+// This is the base class of things you "always"
+// want to control from a HW block.
+class PinCtrl extends Bundle {
+  val oval = Bool()
+  val oe   = Bool()
+  val ie   = Bool()
+}
+
+// Package up the inputs and outputs
+// for the Pin
+abstract class Pin extends Bundle {
+  val i = new Bundle {
+    val ival = Bool(INPUT)
+  }
+  val o: PinCtrl
+
+  // Must be defined by the subclasses
+  def inputPin(pue: Bool = Bool(false)): Bool
+  def outputPin(signal: Bool,
+    pue: Bool = Bool(false),
+    ds: Bool = Bool(false),
+    ie: Bool = Bool(false)
+  ): Unit
+  
+  def inputPin(pins: Vec[this.type], pue: Bool): Vec[Bool] = {
+    val signals = Wire(Vec(pins.length, new Bool()))
+    for ((signal, pin) <- (signals zip pins)) {
+      signal := pin.inputPin(pue)
+    }
+    signals
+  }
+}
+
+
+////////////////////////////////////////////////////////////////////////////////////
+
+class BasePin extends Pin() {
+  val o = new PinCtrl().asOutput
+
+  def inputPin(pue: Bool = Bool(false) /*ignored*/): Bool = {
+    this.o.oval := Bool(false)
+    this.o.oe   := Bool(false)
+    this.o.ie   := Bool(true)
+    this.i.ival
+  }
+
+  def outputPin(signal: Bool,
+    pue: Bool = Bool(false), /*ignored*/
+    ds: Bool = Bool(false), /*ignored*/
+    ie: Bool = Bool(false)
+  ): Unit = {
+    this.o.oval := signal
+    this.o.oe   := Bool(true)
+    this.o.ie   := ie
+  }
+
+}
+
+/////////////////////////////////////////////////////////////////////////
+class EnhancedPinCtrl extends PinCtrl {
+  val pue = Bool()
+  val ds = Bool()
+}
+
+class EnhancedPin extends Pin() {
+
+  val o = new EnhancedPinCtrl().asOutput
+
+  def inputPin(pue: Bool = Bool(false)): Bool = {
+    this.o.oval := Bool(false)
+    this.o.oe   := Bool(false)
+    this.o.pue  := pue
+    this.o.ds   := Bool(false)
+    this.o.ie   := Bool(true)
+
+    this.i.ival
+  }
+
+  def outputPin(signal: Bool,
+    pue: Bool = Bool(false),
+    ds: Bool = Bool(false),
+    ie: Bool = Bool(false)
+  ): Unit = {
+    this.o.oval := signal
+    this.o.oe   := Bool(true)
+    this.o.pue  := pue
+    this.o.ds   := ds
+    this.o.ie   := ie
+  }
+}