From 9a258e7fb467e5d3135fc7b372ef73cb9428ede5 Mon Sep 17 00:00:00 2001
From: Henry Cook <hcook@s144.Millennium.Berkeley.EDU>
Date: Mon, 22 Apr 2013 16:48:55 -0700
Subject: [PATCH] use new locking round robin arbiter

---
 uncore/src/package.scala | 51 ++--------------------------------------
 1 file changed, 2 insertions(+), 49 deletions(-)

diff --git a/uncore/src/package.scala b/uncore/src/package.scala
index 4133a9d3..7e1fc7a0 100644
--- a/uncore/src/package.scala
+++ b/uncore/src/package.scala
@@ -6,6 +6,8 @@ import scala.collection.mutable.Stack
 //TODO: Remove these Networking classes from the package object once Scala bug
 //SI-3439 is resolved.
 
+implicit def toOption[A](a: A) = Option(a)
+
 case class PhysicalNetworkConfiguration(nEndpoints: Int, idBits: Int)
 
 class PhysicalHeader(implicit conf: PhysicalNetworkConfiguration) extends Bundle {
@@ -24,55 +26,6 @@ class BasicCrossbarIO[T <: Data]()(data: => T)(implicit conf: PhysicalNetworkCon
 
 abstract class PhysicalNetwork(conf: PhysicalNetworkConfiguration) extends Component
 
-class LockingRRArbiter[T <: Data](n: Int, count: Int)(data: => T) extends Component {
-  val io = new ioArbiter(n)(data)
-
-  val cnt = Reg(resetVal = UFix(0, width = log2Up(count)))
-  val cnt_next = cnt + UFix(1)
-  val locked = Reg(resetVal = Bool(false))
-  val lock_idx = Reg(resetVal = UFix(n))
-
-  if(count > 1){
-    when(io.out.valid && io.out.ready) {
-      cnt := cnt_next
-      when(!locked) {
-        locked := Bool(true)
-        lock_idx := Vec(io.in.map{ in => in.ready && in.valid}){Bool()}.indexWhere{i: Bool => i} 
-      }
-      when(cnt_next === UFix(0)) {
-        locked := Bool(false)
-      }
-    }
-  } else {
-    locked := Bool(false)
-    lock_idx := UFix(n)
-    cnt := UFix(0)
-  }
-    
-
-  val last_grant = Reg(resetVal = Bits(0, log2Up(n)))
-  val g = ArbiterCtrl((0 until n).map(i => io.in(i).valid && UFix(i) > last_grant) ++ io.in.map(_.valid))
-  val grant = (0 until n).map(i => g(i) && UFix(i) > last_grant || g(i+n))
-  (0 until n).map(i => io.in(i).ready := Mux(locked, lock_idx === UFix(i), grant(i)) && io.out.ready)
-
-  var choose = Bits(n-1)
-  for (i <- n-2 to 0 by -1)
-    choose = Mux(io.in(i).valid, Bits(i), choose)
-  for (i <- n-1 to 1 by -1)
-    choose = Mux(io.in(i).valid && UFix(i) > last_grant, Bits(i), choose)
-  choose = Mux(locked, lock_idx, choose)
-  when (io.out.valid && io.out.ready) {
-    last_grant := choose
-  }
-
-  val dvec = Vec(n) { data } 
-  (0 until n).map(i => dvec(i) := io.in(i).bits )
-
-  io.out.valid := Mux(locked, io.in(lock_idx).valid, io.in.map(_.valid).foldLeft(Bool(false))( _ || _))
-  io.out.bits := dvec(choose)
-  io.chosen := choose
-}
-
 class BasicCrossbar[T <: Data](count: Int)(data: => T)(implicit conf: PhysicalNetworkConfiguration) extends PhysicalNetwork(conf) {
   val io = new Bundle {
     val in  = Vec(conf.nEndpoints){(new FIFOIO){(new BasicCrossbarIO){data}}}.flip