56 lines
1.8 KiB
Scala
56 lines
1.8 KiB
Scala
// See LICENSE.SiFive for license details.
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package freechips.rocketchip.subsystem
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import Chisel._
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import freechips.rocketchip.config.{Field, Parameters}
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import freechips.rocketchip.diplomacy._
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import freechips.rocketchip.tilelink._
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import freechips.rocketchip.util._
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case class FrontBusParams(
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beatBytes: Int,
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blockBytes: Int,
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masterBuffering: BufferParams = BufferParams.default,
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slaveBuffering: BufferParams = BufferParams.default
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) extends TLBusParams
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case object FrontBusKey extends Field[FrontBusParams]
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class FrontBus(params: FrontBusParams)(implicit p: Parameters) extends TLBusWrapper(params, "FrontBus") {
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private val master_buffer = LazyModule(new TLBuffer(params.masterBuffering))
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private val master_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.all))
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master_buffer.suggestName(s"${busName}_master_TLBuffer")
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master_fixer.suggestName(s"${busName}_master_TLFIFOFixer")
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master_fixer.node :=* master_buffer.node
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inwardNode :=* master_fixer.node
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def fromSyncPorts(addBuffers: Int = 0, name: Option[String] = None): TLInwardNode = {
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TLBuffer.chain(addBuffers).foldLeft(master_buffer.node:TLInwardNode)(_ :=* _)
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}
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def fromSyncMasters(addBuffers: Int = 0, name: Option[String] = None): TLInwardNode = {
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TLBuffer.chain(addBuffers).foldLeft(master_buffer.node:TLInwardNode)(_ :=* _)
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}
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def fromCoherentChip: TLInwardNode = inwardNode
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def toSystemBus : TLOutwardNode = TLBuffer(params.slaveBuffering) :=* xbar.node
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}
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/** Provides buses that serve as attachment points,
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* for use in traits that connect individual devices or external ports.
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*/
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trait HasFrontBus extends HasSystemBus {
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private val frontbusParams = p(FrontBusKey)
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val frontbusBeatBytes = frontbusParams.beatBytes
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val fbus = LazyModule(new FrontBus(frontbusParams))
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FlipRendering { implicit p => sbus.fromFrontBus :=* fbus.toSystemBus }
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}
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