Added UncachedTileLinkIO port to RocketTile, simplify arbitration

rocket/src/main/scala/arbiter.scala

@@ -53,6 +53,17 @@ class HellaCacheArbiter(n: Int) extends Module
   }
 }
 
+class RocketUncachedTileLinkIOArbiter(n: Int) extends TileLinkArbiterLike(n) 
+    with AppendsArbiterId {
+  val io = new Bundle {
+    val in = Vec.fill(n){new HeaderlessUncachedTileLinkIO}.flip
+    val out = new HeaderlessUncachedTileLinkIO
+  }
+  hookupClientSourceHeaderless(io.in.map(_.acquire), io.out.acquire)
+  hookupFinish(io.in.map(_.finish), io.out.finish)
+  hookupManagerSourceWithId(io.in.map(_.grant), io.out.grant)
+}
+
 class RocketTileLinkIOArbiter(n: Int) extends TileLinkArbiterLike(n) 
     with AppendsArbiterId {
   val io = new Bundle {

rocket/src/main/scala/rocc.scala

@@ -7,6 +7,8 @@ import Node._
 import uncore._
 import Util._
 
+case object RoCCMemTagBits extends Field[Int]
+
 class RoCCInstruction extends Bundle
 {
   val funct = Bits(width = 7)
@@ -43,7 +45,7 @@ class RoCCInterface extends Bundle
   
   // These should be handled differently, eventually
   val imem = new HeaderlessUncachedTileLinkIO
-  val dmem = new HeaderlessTileLinkIO
+  val dmem = new HeaderlessUncachedTileLinkIO
   val iptw = new TLBPTWIO
   val dptw = new TLBPTWIO
   val pptw = new TLBPTWIO
@@ -127,10 +129,8 @@ class AccumulatorExample extends RoCC
   io.imem.grant.ready := false
   io.imem.finish.valid := false
   io.dmem.acquire.valid := false
-  io.dmem.release.valid := false
-  io.dmem.finish.valid := false
-  io.dmem.probe.ready := false
   io.dmem.grant.ready := false
+  io.dmem.finish.valid := false
   io.iptw.req.valid := false
   io.dptw.req.valid := false
   io.pptw.req.valid := false

rocket/src/main/scala/tile.scala

@@ -8,25 +8,24 @@ import Util._
 
 case object CoreName extends Field[String]
 case object NDCachePorts extends Field[Int]
-case object NTilePorts extends Field[Int]
 case object NPTWPorts extends Field[Int]
 case object BuildRoCC extends Field[Option[() => RoCC]]
 
 abstract class Tile(resetSignal: Bool = null) extends Module(_reset = resetSignal) {
   val io = new Bundle {
-    val tilelink = new HeaderlessTileLinkIO
+    val cached = new HeaderlessTileLinkIO
+    val uncached = new HeaderlessTileLinkIO
     val host = new HTIFIO
   }
 }
 
 class RocketTile(resetSignal: Bool = null) extends Tile(resetSignal) {
-
   val icache = Module(new Frontend, { case CacheName => "L1I"; case CoreName => "Rocket" })
   val dcache = Module(new HellaCache, { case CacheName => "L1D" })
   val ptw = Module(new PTW(params(NPTWPorts)))
   val core = Module(new Core, { case CoreName => "Rocket" })
 
-  dcache.io.cpu.sret := core.io.dmem.sret
+  dcache.io.cpu.sret := core.io.dmem.sret // Bypass sret to dcache
   val dcArb = Module(new HellaCacheArbiter(params(NDCachePorts)))
   dcArb.io.requestor(0) <> ptw.io.mem
   dcArb.io.requestor(1) <> core.io.dmem
@@ -39,23 +38,23 @@ class RocketTile(resetSignal: Bool = null) extends Tile(resetSignal) {
   core.io.imem <> icache.io.cpu
   core.io.ptw <> ptw.io.dpath
 
-  val memArb = Module(new RocketTileLinkIOArbiter(params(NTilePorts)))
-  io.tilelink <> memArb.io.out
-  memArb.io.in(0) <> dcache.io.mem
-  memArb.io.in(1) <> HeaderlessTileLinkIOWrapper(icache.io.mem)
-
+  // Connect the caches and ROCC to the outer memory system
+  io.cached <> dcache.io.mem
   // If so specified, build an RoCC module and wire it in
-  params(BuildRoCC)
-    .map { br => br() }
-    .foreach { rocc =>
+  // otherwise, just hookup the icache
+  io.uncached <> params(BuildRoCC).map { buildItHere =>
+    val rocc = buildItHere()
+    val memArb = Module(new RocketUncachedTileLinkIOArbiter(3))
     val dcIF = Module(new SimpleHellaCacheIF)
     core.io.rocc <> rocc.io
     dcIF.io.requestor <> rocc.io.mem
     dcArb.io.requestor(2) <> dcIF.io.cache
-      memArb.io.in(2) <> HeaderlessTileLinkIOWrapper(rocc.io.imem)
-      memArb.io.in(3) <> rocc.io.dmem
+    memArb.io.in(0) <> icache.io.mem
+    memArb.io.in(1) <> rocc.io.imem
+    memArb.io.in(2) <> rocc.io.dmem
     ptw.io.requestor(2) <> rocc.io.iptw
     ptw.io.requestor(3) <> rocc.io.dptw
     ptw.io.requestor(4) <> rocc.io.pptw
-    }
+    memArb.io.out
+  }.getOrElse(icache.io.mem)
 }