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Add optional frontbus for peripherals mastering into SBus. Switch FF and Buffer order on non-tile masters into SBus. Buffer non-L2 side of splitter

This commit is contained in:
Henry Styles 2017-08-25 18:12:25 -07:00 committed by Wesley W. Terpstra
parent 173f185b17
commit f7330028cc

View File

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// See LICENSE.SiFive for license details.
package freechips.rocketchip.coreplex
import Chisel._
import freechips.rocketchip.config.{Field, Parameters}
import freechips.rocketchip.diplomacy._
import freechips.rocketchip.tilelink._
import freechips.rocketchip.util._
case class FrontBusParams(
beatBytes: Int,
blockBytes: Int,
masterBuffering: BufferParams = BufferParams.default,
slaveBuffering: BufferParams = BufferParams.none // TODO should be BufferParams.none on BCE
) extends TLBusParams
case object FrontBusParams extends Field[FrontBusParams]
class FrontBus(params: FrontBusParams)(implicit p: Parameters) extends TLBusWrapper(params) {
xbar.suggestName("FrontBus")
def fromSyncMasters(params: BufferParams = BufferParams.default, buffers: Int = 1): TLInwardNode = {
val buf = List.fill(buffers)(LazyModule(new TLBuffer(params)))
for(i<-1 until buffers) {
buf(i).node :=* buf(i-1).node
}
inwardNode :=* buf(buffers-1).node
if(buffers>0) buf(0).node else inwardNode
}
def fromSyncPorts(params: BufferParams = BufferParams.default, buffers: Int = 1): TLInwardNode = {
val buf = List.fill(buffers)(LazyModule(new TLBuffer(params)))
for(i<-1 until buffers) {
buf(i).node :=* buf(i-1).node
}
inwardNode :=* buf(buffers-1).node
if(buffers>0) buf(0).node else inwardNode
}
def fromSyncFIFOMaster(params: BufferParams = BufferParams.default, buffers: Int = 1): TLInwardNode = fromSyncPorts(params, buffers)
def toSystemBus : TLOutwardNode = outwardBufNode
}
/** Provides buses that serve as attachment points,
* for use in traits that connect individual devices or external ports.
*/
trait HasFrontBus extends HasSystemBus {
private val frontbusParams = p(FrontBusParams)
val frontbusBeatBytes = frontbusParams.beatBytes
val frontbus = new FrontBus(frontbusParams)
sbus.fromSyncPorts() := frontbus.toSystemBus
}