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rocket-chip/src/main/scala/uncore/tilelink2/Buffer.scala

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// See LICENSE for license details.
package uncore.tilelink2
import Chisel._
import chisel3.internal.sourceinfo.SourceInfo
import diplomacy._
import scala.math.{min,max}
// pipe is only used if a queue has depth = 1
class TLBuffer(a: Int = 2, b: Int = 2, c: Int = 2, d: Int = 2, e: Int = 2, pipe: Boolean = true) extends LazyModule
{
require (a >= 0)
require (b >= 0)
require (c >= 0)
require (d >= 0)
require (e >= 0)
val node = TLAdapterNode(
clientFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + min(1,b) + min(1,c)) },
managerFn = { seq => seq(0).copy(minLatency = seq(0).minLatency + min(1,a) + min(1,d)) })
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val in = node.bundleIn
val out = node.bundleOut
}
((io.in zip io.out) zip (node.edgesIn zip node.edgesOut)) foreach { case ((in, out), (edgeIn, edgeOut)) =>
if (a>0) { out.a <> Queue(in .a, a, pipe && a<2) } else { out.a <> in.a }
if (d>0) { in .d <> Queue(out.d, d, pipe && d<2) } else { in.d <> out.d }
if (edgeOut.manager.anySupportAcquire && edgeOut.client.anySupportProbe) {
if (b>0) { in .b <> Queue(out.b, b, pipe && b<2) } else { in.b <> out.b }
if (c>0) { out.c <> Queue(in .c, c, pipe && c<2) } else { out.c <> in.c }
if (e>0) { out.e <> Queue(in .e, e, pipe && e<2) } else { out.e <> in.e }
} else {
in.b.valid := Bool(false)
in.c.ready := Bool(true)
in.e.ready := Bool(true)
out.b.ready := Bool(true)
out.c.valid := Bool(false)
out.e.valid := Bool(false)
}
}
}
}
object TLBuffer
{
// applied to the TL source node; y.node := TLBuffer(x.node)
def apply() (x: TLOutwardNode)(implicit sourceInfo: SourceInfo): TLOutwardNode = apply(2)(x)
def apply(entries: Int) (x: TLOutwardNode)(implicit sourceInfo: SourceInfo): TLOutwardNode = apply(entries, true)(x)
def apply(entries: Int, pipe: Boolean) (x: TLOutwardNode)(implicit sourceInfo: SourceInfo): TLOutwardNode = apply(entries, entries, pipe)(x)
def apply(ace: Int, bd: Int) (x: TLOutwardNode)(implicit sourceInfo: SourceInfo): TLOutwardNode = apply(ace, bd, true)(x)
def apply(ace: Int, bd: Int, pipe: Boolean)(x: TLOutwardNode)(implicit sourceInfo: SourceInfo): TLOutwardNode = apply(ace, bd, ace, bd, ace, pipe)(x)
def apply(a: Int, b: Int, c: Int, d: Int, e: Int, pipe: Boolean = true)(x: TLOutwardNode)(implicit sourceInfo: SourceInfo): TLOutwardNode = {
val buffer = LazyModule(new TLBuffer(a, b, c, d, e, pipe))
buffer.node := x
buffer.node
}
}