allow coreplex to take in more than 1 bus port

coreplex/src/main/scala/Configs.scala

@@ -160,7 +160,7 @@ class BaseCoreplexConfig extends Config (
             else new MESICoherence(site(L2DirectoryRepresentation))),
           nManagers = site(NBanksPerMemoryChannel)*site(NMemoryChannels) + 1 /* MMIO */,
           nCachingClients = site(NCachedTileLinkPorts),
-          nCachelessClients = (if (site(ExportBusPort)) 1 else 0) + site(NUncachedTileLinkPorts),
+          nCachelessClients = site(NBusPorts) + site(NUncachedTileLinkPorts),
           maxClientXacts = max_int(
               // L1 cache
               site(NMSHRs) + 1 /* IOMSHR */,

coreplex/src/main/scala/Coreplex.scala

@@ -36,8 +36,8 @@ case object RTCPeriod extends Field[Int]
 case object BootROMFile extends Field[String]
 /** Export an external MMIO slave port */
 case object ExportMMIOPort extends Field[Boolean]
-/** Expose an additional bus master port */
-case object ExportBusPort extends Field[Boolean]
+/** Expose additional bus master ports */
+case object NBusPorts extends Field[Int]
 /** Extra top-level ports exported from the coreplex */
 case object ExtraCoreplexPorts extends Field[Parameters => Bundle]
 
@@ -53,7 +53,7 @@ trait HasCoreplexParameters {
   lazy val innerParams = p.alterPartial({ case TLId => "L1toL2" })
   lazy val outermostParams = p.alterPartial({ case TLId => "Outermost" })
   lazy val outermostMMIOParams = p.alterPartial({ case TLId => "MMIO_Outermost" })
-  lazy val exportBus = p(ExportBusPort)
+  lazy val nBusPorts = p(NBusPorts)
   lazy val exportMMIO = p(ExportMMIOPort)
 }
 
@@ -69,7 +69,7 @@ class Uncore(implicit val p: Parameters) extends Module
     val tiles_cached = Vec(nCachedTilePorts, new ClientTileLinkIO).flip
     val tiles_uncached = Vec(nUncachedTilePorts, new ClientUncachedTileLinkIO).flip
     val prci = Vec(nTiles, new PRCITileIO).asOutput
-    val bus = if (exportBus) Some(new ClientUncachedTileLinkIO()(innerParams).flip) else None
+    val bus = Vec(nBusPorts, new ClientUncachedTileLinkIO()(innerParams)).flip
     val mmio = if (exportMMIO) Some(new ClientUncachedTileLinkIO()(outermostMMIOParams)) else None
     val interrupts = Vec(p(NExtInterrupts), Bool()).asInput
     val debug = new DebugBusIO()(p).flip
@@ -81,7 +81,7 @@ class Uncore(implicit val p: Parameters) extends Module
   outmemsys.io.incoherent foreach (_ := false)
   outmemsys.io.tiles_uncached <> io.tiles_uncached
   outmemsys.io.tiles_cached <> io.tiles_cached
-  if (exportBus) { outmemsys.io.bus.get <> io.bus.get }
+  outmemsys.io.bus <> io.bus
   io.mem <> outmemsys.io.mem
 
   buildMMIONetwork(p.alterPartial({case TLId => "L2toMMIO"}))
@@ -147,7 +147,7 @@ abstract class OuterMemorySystem(implicit val p: Parameters)
   val io = new Bundle {
     val tiles_cached = Vec(nCachedTilePorts, new ClientTileLinkIO).flip
     val tiles_uncached = Vec(nUncachedTilePorts, new ClientUncachedTileLinkIO).flip
-    val bus = if (exportBus) Some(new ClientUncachedTileLinkIO()(innerParams).flip) else None
+    val bus = Vec(nBusPorts, new ClientUncachedTileLinkIO()(innerParams)).flip
     val incoherent = Vec(nCachedTilePorts, Bool()).asInput
     val mem  = Vec(nMemChannels, new ClientUncachedTileLinkIO()(outermostParams))
     val mmio = new ClientUncachedTileLinkIO()(p.alterPartial({case TLId => "L2toMMIO"}))
@@ -232,7 +232,7 @@ abstract class Coreplex(implicit val p: Parameters) extends Module
     with HasCoreplexParameters {
   class CoreplexIO(implicit val p: Parameters) extends Bundle {
     val mem  = Vec(nMemChannels, new ClientUncachedTileLinkIO()(outermostParams))
-    val bus = if (p(ExportBusPort)) Some(new ClientUncachedTileLinkIO()(innerParams).flip) else None
+    val bus = Vec(nBusPorts, new ClientUncachedTileLinkIO()(innerParams)).flip
     val mmio = if(p(ExportMMIOPort)) Some(new ClientUncachedTileLinkIO()(outermostMMIOParams)) else None
     val interrupts = Vec(p(NExtInterrupts), Bool()).asInput
     val debug = new DebugBusIO()(p).flip
@@ -273,7 +273,7 @@ class DefaultCoreplex(topParams: Parameters) extends Coreplex()(topParams) {
   uncore.io.tiles_uncached <> tileList.map(_.io.uncached).flatten
   uncore.io.interrupts <> io.interrupts
   uncore.io.debug <> io.debug
-  if (exportBus) { uncore.io.bus.get <> io.bus.get }
+  uncore.io.bus <> io.bus
   if (exportMMIO) { io.mmio.get <> uncore.io.mmio.get }
   io.mem <> uncore.io.mem
 }

coreplex/src/main/scala/DirectGroundTest.scala

@@ -14,7 +14,7 @@ class DirectGroundTestCoreplex(topParams: Parameters) extends Coreplex()(topPara
   io.debug.resp.valid := Bool(false)
 
   require(!exportMMIO)
-  require(!exportBus)
+  require(nBusPorts == 0)
   require(nMemChannels == 1)
   require(nTiles == 1)
 

coreplex/src/main/scala/UnitTest.scala

@@ -8,7 +8,7 @@ import cde.Parameters
 
 class UnitTestCoreplex(topParams: Parameters) extends Coreplex()(topParams) {
   require(!exportMMIO)
-  require(!exportBus)
+  require(nBusPorts == 0)
   require(nMemChannels == 0)
 
   io.debug.req.ready := Bool(false)

src/main/scala/Configs.scala

@@ -132,7 +132,7 @@ class BasePlatformConfig extends Config (
       case ExportMMIOPort => (site(ExtraDevices).size + site(ExtMMIOPorts).size) > 0
       case AsyncBusChannels => false
       case NExtBusAXIChannels => 0
-      case ExportBusPort => site(NExtBusAXIChannels) > 0
+      case NBusPorts => if (site(NExtBusAXIChannels) > 1) 1 else 0
       case ConnectExtraPorts =>
         (out: Bundle, in: Bundle, p: Parameters) => out <> in
 

src/main/scala/RocketChip.scala

@@ -57,7 +57,6 @@ trait HasTopLevelParameters {
   lazy val innerParams = p.alterPartial({ case TLId => "L1toL2" })
   lazy val outermostParams = p.alterPartial({ case TLId => "Outermost" })
   lazy val outermostMMIOParams = p.alterPartial({ case TLId => "MMIO_Outermost" })
-  lazy val exportBus = p(ExportBusPort)
   lazy val exportMMIO = p(ExportMMIOPort)
 }
 
@@ -135,7 +134,7 @@ class Top(topParams: Parameters) extends Module with HasTopLevelParameters {
 
   if (exportMMIO) { periphery.io.mmio_in.get <> coreplex.io.mmio.get }
   periphery.io.mem_in <> coreplex.io.mem
-  if (exportBus) { coreplex.io.bus.get <> periphery.io.bus_out.get }
+  coreplex.io.bus <> periphery.io.bus_out
 
   coreplex.io.debug <>
     (if (p(AsyncDebugBus))
@@ -179,7 +178,7 @@ class Periphery(implicit val p: Parameters) extends Module
     with HasTopLevelParameters {
   val io = new Bundle {
     val mem_in  = Vec(nMemChannels, new ClientUncachedTileLinkIO()(outermostParams)).flip
-    val bus_out = if (exportBus) Some(new ClientUncachedTileLinkIO()(innerParams)) else None
+    val bus_out = Vec(p(NBusPorts), new ClientUncachedTileLinkIO()(innerParams))
     val mmio_in = if (exportMMIO) Some(new ClientUncachedTileLinkIO()(outermostMMIOParams).flip) else None
     val mem_axi = Vec(nMemAXIChannels, new NastiIO)
     val mem_ahb = Vec(nMemAHBChannels, new HastiMasterIO)
@@ -191,12 +190,14 @@ class Periphery(implicit val p: Parameters) extends Module
     val extra = p(ExtraTopPorts)(p)
   }
 
-  io.bus_out.map { tl_out =>
+  require(io.bus_out.size <= 1)
+
+  if (io.bus_out.size > 0) {
     val conv = Module(new TileLinkIONastiIOConverter)
     val arb = Module(new NastiArbiter(p(NExtBusAXIChannels)))
     arb.io.master <> io.bus_axi
     conv.io.nasti <> conv.io.tl
-    tl_out <> conv.io.tl
+    io.bus_out.head <> conv.io.tl
   }
 
   def connectExternalMMIO(ports: Seq[ClientUncachedTileLinkIO])(implicit p: Parameters) {