tile: cake reduction

* merge HasScratchpadSlavePort into RocketTile
* merge CanHaveSharedFPUModule into BaseTileModule

src/main/scala/rocket/ScratchpadSlavePort.scala

@@ -6,13 +6,12 @@ import Chisel._
 import Chisel.ImplicitConversions._
 
 import freechips.rocketchip.config.Parameters
-import freechips.rocketchip.devices.tilelink._
 import freechips.rocketchip.diplomacy._
 import freechips.rocketchip.tile._
 import freechips.rocketchip.tilelink._
-import freechips.rocketchip.interrupts._
 import freechips.rocketchip.util._
 
+/* This adapter converts between diplomatic TileLink and non-diplomatic HellaCacheIO */
 class ScratchpadSlavePort(address: AddressSet, coreDataBytes: Int, usingAtomics: Boolean)(implicit p: Parameters) extends LazyModule {
   val device = new SimpleDevice("dtim", Seq("sifive,dtim0"))
   val node = TLManagerNode(Seq(TLManagerPortParameters(
@@ -93,56 +92,3 @@ class ScratchpadSlavePort(address: AddressSet, coreDataBytes: Int, usingAtomics:
     tl_in.e.ready := Bool(true)
   }
 }
-
-/** Mix-ins for constructing tiles that have optional scratchpads */
-trait CanHaveScratchpad extends HasHellaCache with HasICacheFrontend { this: BaseTile =>
-  val module: CanHaveScratchpadModule
-
-  val intOutwardNode = IntIdentityNode()
-  val slaveNode = TLIdentityNode()
-  val masterNode = TLIdentityNode()
-
-  val scratch = tileParams.dcache.flatMap { d => d.scratch.map(s =>
-    LazyModule(new ScratchpadSlavePort(AddressSet(s, d.dataScratchpadBytes-1), xBytes, tileParams.core.useAtomics && !tileParams.core.useAtomicsOnlyForIO)))
-  }
-  scratch.foreach(lm => connectTLSlave(lm.node, xBytes))
-
-  val busErrorUnit = tileParams.core.tileControlAddr map { a =>
-    val beu = LazyModule(new BusErrorUnit(new L1BusErrors, BusErrorUnitParams(a)))
-    intOutwardNode := beu.intNode
-    connectTLSlave(beu.node, xBytes)
-    beu
-  }
-
-  val tile_master_blocker =
-    tileParams.blockerCtrlAddr
-      .map(BasicBusBlockerParams(_, xBytes, masterPortBeatBytes, deadlock = true))
-      .map(bp => LazyModule(new BasicBusBlocker(bp)))
-
-  tile_master_blocker.foreach(lm => connectTLSlave(lm.controlNode, xBytes))
-
-  // TODO: this doesn't block other masters, e.g. RoCCs
-  tlOtherMastersNode := tile_master_blocker.map { _.node := tlMasterXbar.node } getOrElse { tlMasterXbar.node }
-  masterNode :=* tlOtherMastersNode
-  tlSlaveXbar.node :*= slaveNode 
-
-
-  def findScratchpadFromICache: Option[AddressSet] = scratch.map { s =>
-    val finalNode = frontend.masterNode.edges.out.head.manager.managers.find(_.nodePath.last == s.node)
-    require (finalNode.isDefined, "Could not find the scratch pad; not reachable via icache?")
-    require (finalNode.get.address.size == 1, "Scratchpad address space was fragmented!")
-    finalNode.get.address(0)
-  }
-
-  nDCachePorts += (scratch.isDefined).toInt
-}
-
-trait CanHaveScratchpadModule extends HasHellaCacheModule with HasICacheFrontendModule {
-  val outer: CanHaveScratchpad
-
-  outer.scratch.foreach { lm => dcachePorts += lm.module.io.dmem }
-  outer.busErrorUnit.foreach { lm =>
-    lm.module.io.errors.dcache := outer.dcache.module.io.errors
-    lm.module.io.errors.icache := outer.frontend.module.io.errors
-  }
-}

src/main/scala/tile/BaseTile.scala

@@ -181,6 +181,8 @@ class BaseTileModule[+L <: BaseTile](val outer: L) extends LazyModuleImp(outer)
 
   val trace = tileParams.trace.option(IO(Vec(tileParams.core.retireWidth, new TracedInstruction).asOutput))
   val constants = IO(new TileInputConstants)
+
+  val fpuOpt = outer.tileParams.core.fpu.map(params => Module(new FPU(params)(outer.p)))
 }
 
 /** Some other non-tilelink but still standard inputs */

src/main/scala/tile/FPU.scala

@@ -874,9 +874,3 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
     req
   }
 }
-
-/** Mix-in for constructing tiles that may have an FPU external to the core pipeline */
-trait CanHaveSharedFPUModule[+L <: BaseTile] { this: BaseTileModule[L] =>
-  val fpuOpt = outer.tileParams.core.fpu.map(params => Module(new FPU(params)(outer.p)))
-  // TODO fpArb could go here instead of inside LegacyRoccComplex
-}

src/main/scala/tile/LazyRoCC.scala

@@ -90,8 +90,7 @@ trait HasLazyRoCC extends CanHavePTW { this: BaseTile =>
   nDCachePorts += roccs.size
 }
 
-trait HasLazyRoCCModule[+L <: BaseTile with HasLazyRoCC] extends CanHaveSharedFPUModule[L]
-    with CanHavePTWModule
+trait HasLazyRoCCModule[+L <: BaseTile with HasLazyRoCC] extends CanHavePTWModule
     with HasCoreParameters { this: BaseTileModule[L] =>
 
   val roccCore = Wire(new RoCCCoreIO()(outer.p))

src/main/scala/tile/RocketTile.scala

@@ -6,7 +6,10 @@ package freechips.rocketchip.tile
 import Chisel._
 import freechips.rocketchip.config._
 import freechips.rocketchip.coreplex.CoreplexClockCrossing
+import freechips.rocketchip.devices.tilelink._
 import freechips.rocketchip.diplomacy._
+import freechips.rocketchip.interrupts._
+import freechips.rocketchip.tilelink._
 import freechips.rocketchip.rocket._
 import freechips.rocketchip.util._
 
@@ -34,11 +37,47 @@ class RocketTile(
   (implicit p: Parameters) extends BaseTile(rocketParams, crossing)(p)
     with HasExternalInterrupts
     with HasLazyRoCC  // implies CanHaveSharedFPU with CanHavePTW with HasHellaCache
-    with CanHaveScratchpad { // implies CanHavePTW with HasHellaCache with HasICacheFrontend
+    with HasHellaCache
+    with HasICacheFrontend {
 
-  nDCachePorts += 1 // core TODO dcachePorts += () => module.core.io.dmem ??
+  val intOutwardNode = IntIdentityNode()
+  val slaveNode = TLIdentityNode()
+  val masterNode = TLIdentityNode()
 
-  val dtimProperty = scratch.map(d => Map(
+  val dtim_adapter = tileParams.dcache.flatMap { d => d.scratch.map(s =>
+    LazyModule(new ScratchpadSlavePort(AddressSet(s, d.dataScratchpadBytes-1), xBytes, tileParams.core.useAtomics && !tileParams.core.useAtomicsOnlyForIO)))
+  }
+  dtim_adapter.foreach(lm => connectTLSlave(lm.node, xBytes))
+
+  val bus_error_unit = tileParams.core.tileControlAddr map { a =>
+    val beu = LazyModule(new BusErrorUnit(new L1BusErrors, BusErrorUnitParams(a)))
+    intOutwardNode := beu.intNode
+    connectTLSlave(beu.node, xBytes)
+    beu
+  }
+
+  val tile_master_blocker =
+    tileParams.blockerCtrlAddr
+      .map(BasicBusBlockerParams(_, xBytes, masterPortBeatBytes, deadlock = true))
+      .map(bp => LazyModule(new BasicBusBlocker(bp)))
+
+  tile_master_blocker.foreach(lm => connectTLSlave(lm.controlNode, xBytes))
+
+  // TODO: this doesn't block other masters, e.g. RoCCs
+  tlOtherMastersNode := tile_master_blocker.map { _.node := tlMasterXbar.node } getOrElse { tlMasterXbar.node }
+  masterNode :=* tlOtherMastersNode
+  tlSlaveXbar.node :*= slaveNode
+
+  def findScratchpadFromICache: Option[AddressSet] = dtim_adapter.map { s =>
+    val finalNode = frontend.masterNode.edges.out.head.manager.managers.find(_.nodePath.last == s.node)
+    require (finalNode.isDefined, "Could not find the scratch pad; not reachable via icache?")
+    require (finalNode.get.address.size == 1, "Scratchpad address space was fragmented!")
+    finalNode.get.address(0)
+  }
+
+  nDCachePorts += 1 /*core */ + (dtim_adapter.isDefined).toInt
+
+  val dtimProperty = dtim_adapter.map(d => Map(
     "sifive,dtim" -> d.device.asProperty)).getOrElse(Nil)
 
   val itimProperty = tileParams.icache.flatMap(_.itimAddr.map(i => Map(
@@ -58,15 +97,23 @@ class RocketTile(
 
 class RocketTileModule(outer: RocketTile) extends BaseTileModule(outer)
     with HasLazyRoCCModule[RocketTile]
-    with CanHaveScratchpadModule {
+    with HasHellaCacheModule
+    with HasICacheFrontendModule {
 
   val core = Module(p(BuildCore)(outer.p))
 
   val uncorrectable = RegInit(Bool(false))
   val halt_and_catch_fire = outer.rocketParams.hcfOnUncorrectable.option(IO(Bool(OUTPUT)))
 
+  outer.dtim_adapter.foreach { lm => dcachePorts += lm.module.io.dmem }
+
+  outer.bus_error_unit.foreach { lm =>
+    lm.module.io.errors.dcache := outer.dcache.module.io.errors
+    lm.module.io.errors.icache := outer.frontend.module.io.errors
+  }
+
   outer.decodeCoreInterrupts(core.io.interrupts) // Decode the interrupt vector
-  outer.busErrorUnit.foreach { beu => core.io.interrupts.buserror.get := beu.module.io.interrupt }
+  outer.bus_error_unit.foreach { beu => core.io.interrupts.buserror.get := beu.module.io.interrupt }
   core.io.hartid := constants.hartid // Pass through the hartid
   trace.foreach { _ := core.io.trace }
   halt_and_catch_fire.foreach { _ := uncorrectable }