Merge pull request #568 from ucb-bar/elide-empty-int-ext

PeripheryExtInterrupts: elide node if NExtTopInterrupts = 0

src/main/scala/coreplex/RISCVPlatform.scala

@@ -25,6 +25,7 @@ trait CoreplexRISCVPlatform extends CoreplexNetwork {
   plic.intnode := intBar.intnode
 
   lazy val dts = DTS(bindingTree)
+  lazy val json = JSON(bindingTree)
 }
 
 trait CoreplexRISCVPlatformBundle extends CoreplexNetworkBundle {
@@ -49,4 +50,5 @@ trait CoreplexRISCVPlatformModule extends CoreplexNetworkModule {
 
   println(outer.dts)
   ElaborationArtefacts.add("dts", outer.dts)
+  ElaborationArtefacts.add("json", outer.json)
 }

src/main/scala/diplomacy/JSON.scala

@@ -0,0 +1,45 @@
+// See LICENSE.SiFive for license details.
+
+package diplomacy
+
+import scala.collection.immutable.SortedMap
+
+object JSON
+{
+  def apply(res: ResourceValue): String = {
+    val root = res match {
+      case ResourceMap(value, _) => value.toList match {
+        case Seq(("/", Seq(subtree))) => subtree
+        case _ => res
+      }
+      case _ => res
+    }
+    helper(root)(SortedMap(map(root):_*)).mkString
+  }
+
+  private def map(res: ResourceValue, path: String = ""): Seq[(String, String)] = res match {
+    case ResourceMap(value, labels) => {
+      labels.map(_ -> path) ++
+      value.flatMap { case (key, seq) => seq.flatMap(map(_, path + "/" + key)) }
+    }
+    case _ => Nil
+  }
+
+  private def helper(res: ResourceValue)(implicit path: Map[String, String]): Seq[String] = res match {
+    case ResourceAddress(address, r, w, x) =>
+      AddressRange.fromSets(address).map { case AddressRange(base, size) =>
+        s"""{"base":${base},"size":${size},"r":${r},"w":${w},"x":${x}}"""}
+    case ResourceMapping(address, offset) =>
+      AddressRange.fromSets(address).map { case AddressRange(base, size) =>
+        s"""{"base":${base},"size":${size},"offset":${offset}}"""}
+    case ResourceInt(value) => Seq(value.toString)
+    case ResourceString(value) => Seq("\"" + value + "\"")
+    case ResourceReference(value) => Seq("\"&" + path(value) + "\"")
+    case ResourceMap(value, _) => {
+      Seq(value.map {
+        case (key, Seq(v: ResourceMap)) => s""""${key}":${helper(v).mkString}"""
+        case (key, seq) => s""""${key}":[${seq.flatMap(helper).mkString(",")}]"""
+      }.mkString("{", ",", "}"))
+    }
+  }
+}

src/main/scala/diplomacy/Resources.scala

@@ -126,9 +126,9 @@ trait BindingScope
   protected[diplomacy] var resourceBindings: Seq[(Resource, Option[Device], ResourceValue)] = Nil
 
   private case class ExpandedValue(path: Seq[String], labels: Seq[String], value: Seq[ResourceValue])
-  private def eval() {
+  private lazy val eval: Unit = {
     require (LazyModule.stack.isEmpty, "May not evaluate binding while still constructing LazyModules")
-    parentScope.foreach { _.eval() }
+    parentScope.foreach { _.eval }
     resourceBindings = parentScope.map(_.resourceBindings).getOrElse(Nil)
     BindingScope.active = Some(this)
     resourceBindingFns.reverse.foreach { _() }
@@ -142,7 +142,6 @@ trait BindingScope
     val labels = values_p.flatMap(_.labels)
     val keys = keys_p.groupBy(_.path.head).toList.map { case (key, seq) =>
       (key -> makeTree(seq.map { x => x.copy(path = x.path.tail) }))
-      // case ExpandedValue(keys, values) => ExpandedValue(keys.tail, values) }))
     }
     if (keys.isEmpty) values else ResourceMap(SortedMap(keys:_*), labels) +: values
   }
@@ -158,7 +157,7 @@ trait BindingScope
   }
 
   def bindingTree: ResourceMap = {
-    eval()
+    eval
     val map: Map[Device, ResourceBindings] =
       resourceBindings.reverse.groupBy(_._1.owner).mapValues(seq => ResourceBindings(
         seq.groupBy(_._1.key).mapValues(_.map(z => Binding(z._2, z._3)))))

src/main/scala/rocket/ScratchpadSlavePort.scala

@@ -15,9 +15,11 @@ import util._
 
 class ScratchpadSlavePort(sizeBytes: Int)(implicit p: Parameters) extends LazyModule
     with HasCoreParameters {
+  val device = new MemoryDevice
   val node = TLManagerNode(Seq(TLManagerPortParameters(
     Seq(TLManagerParameters(
       address            = List(AddressSet(0x80000000L, BigInt(sizeBytes-1))),
+      resources          = device.reg,
       regionType         = RegionType.UNCACHED,
       executable         = true,
       supportsArithmetic = if (usingAtomics) TransferSizes(1, coreDataBytes) else TransferSizes.none,

src/main/scala/rocket/Tile.scala

@@ -43,19 +43,31 @@ class RocketTile(val rocketParams: RocketTileParams, val hartid: Int)(implicit p
       val isa = s"rv${p(XLen)}i$m$a$f$d$c$s"
 
       val dcache = rocketParams.dcache.map(d => Map(
-        "d-tlb-size"           -> ofInt(d.nTLBEntries),
-        "d-tlb-sets"           -> ofInt(1),
         "d-cache-block-size"   -> ofInt(block),
         "d-cache-sets"         -> ofInt(d.nSets),
         "d-cache-size"         -> ofInt(d.nSets * d.nWays * block))).getOrElse(Map())
 
       val icache = rocketParams.icache.map(i => Map(
-        "i-tlb-size"           -> ofInt(i.nTLBEntries),
-        "i-tlb-sets"           -> ofInt(1),
         "i-cache-block-size"   -> ofInt(block),
         "i-cache-sets"         -> ofInt(i.nSets),
         "i-cache-size"         -> ofInt(i.nSets * i.nWays * block))).getOrElse(Map())
 
+      val dtlb = rocketParams.dcache.filter(_ => rocketParams.core.useVM).map(d => Map(
+        "d-tlb-size"           -> ofInt(d.nTLBEntries),
+        "d-tlb-sets"           -> ofInt(1))).getOrElse(Map())
+
+      val itlb = rocketParams.icache.filter(_ => rocketParams.core.useVM).map(i => Map(
+        "i-tlb-size"           -> ofInt(i.nTLBEntries),
+        "i-tlb-sets"           -> ofInt(1))).getOrElse(Map())
+
+      val mmu = if (!rocketParams.core.useVM) Map() else Map(
+        "tlb-split" -> Nil,
+        "mmu-type"  -> ofStr(p(PgLevels) match {
+          case 2 => "riscv,sv32"
+          case 3 => "riscv,sv39"
+          case 4 => "riscv,sv48"
+      }))
+
       // Find all the caches
       val outer = masterNode.edgesOut
         .flatMap(_.manager.managers)
@@ -74,14 +86,9 @@ class RocketTile(val rocketParams: RocketTileParams, val hartid: Int)(implicit p
         "status"               -> ofStr("okay"),
         "clock-frequency"      -> Seq(ResourceInt(rocketParams.core.bootFreqHz)),
         "riscv,isa"            -> ofStr(isa),
-        "mmu-type"             -> ofStr(p(PgLevels) match {
-                                    case 2 => "riscv,sv32"
-                                    case 3 => "riscv,sv39"
-                                    case 4 => "riscv,sv48" }),
-        "tlb-split"            -> Nil,
         "interrupt-controller" -> Nil,
         "#interrupt-cells"     -> ofInt(1))
-        ++ dcache ++ icache ++ nextlevel)
+        ++ dcache ++ icache ++ nextlevel ++ mmu ++ itlb ++ dtlb)
     }
   }
 

src/main/scala/rocketchip/Configs.scala

@@ -148,6 +148,10 @@ class WithDTS(model: String, compat: Seq[String]) extends Config((site, here, up
   case DTSCompat => compat
 })
 
+class WithTimebase(hertz: BigInt) extends Config((site, here, up) => {
+  case DTSTimebase => hertz
+})
+
 class WithScratchpad extends Config(new WithNMemoryChannels(0) ++ new WithDataScratchpad(16384))
 
 class DefaultFPGASmallConfig extends Config(new WithNSmallCores(1) ++ new DefaultFPGAConfig)

src/main/scala/rocketchip/Periphery.scala

@@ -59,10 +59,12 @@ trait PeripheryExtInterrupts {
 
   val nExtInterrupts = p(NExtTopInterrupts)
   val extInterrupts = IntInternalInputNode(IntSourcePortSimple(num = nExtInterrupts, resources = device.int))
-  val extInterruptXing = LazyModule(new IntXing)
 
-  intBus.intnode := extInterruptXing.intnode
-  extInterruptXing.intnode := extInterrupts
+  if (nExtInterrupts > 0) {
+    val extInterruptXing = LazyModule(new IntXing)
+    intBus.intnode := extInterruptXing.intnode
+    extInterruptXing.intnode := extInterrupts
+  }
 }
 
 trait PeripheryExtInterruptsBundle {
@@ -77,7 +79,7 @@ trait PeripheryExtInterruptsModule {
     val outer: PeripheryExtInterrupts
     val io: PeripheryExtInterruptsBundle
   } =>
-  outer.extInterrupts.bundleIn(0).zipWithIndex.foreach { case(o, i) => o := io.interrupts(i) }
+  outer.extInterrupts.bundleIn.flatten.zipWithIndex.foreach { case(o, i) => o := io.interrupts(i) }
 }
 
 /////