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tilelink2: add the FIFOFixer

This commit is contained in:
Wesley W. Terpstra 2017-03-20 16:29:03 -07:00
parent c33f31dd3c
commit 198afddb4b

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// See LICENSE.SiFive for license details.
package uncore.tilelink2
import Chisel._
import chisel3.internal.sourceinfo.SourceInfo
import config._
import diplomacy._
import scala.math.max
class TLFIFOFixer(implicit p: Parameters) extends LazyModule
{
// We request downstream FIFO so we can use the existing fifoId
val node = TLAdapterNode(
clientFn = { cp => cp.copy(clients = cp.clients .map(c => c.copy(requestFifo = !c.supportsProbe))) },
managerFn = { mp => mp.copy(managers = mp.managers.map(m => m.copy(fifoId = Some(0)))) })
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)) =>
val maxId = edgeOut.manager.managers.flatMap(_.fifoId).foldLeft(0)(max)
val a_id = edgeOut.manager.findFifoIdFast(in.a.bits.address)
val a_nid = a_id === UInt(0) // no id = not FIFO
val a_first = edgeIn.first(in.a)
val d_first = edgeOut.first(out.d)
val stalls = edgeIn.client.clients.filter(c => c.requestFifo && c.sourceId.size > 1).map { c =>
val a_sel = c.sourceId.contains(in.a.bits.source)
val d_sel = c.sourceId.contains(in.d.bits.source)
val id = RegInit(UInt(0, width = log2Ceil(maxId+1)))
val count = RegInit(UInt(0, width = log2Ceil(c.sourceId.size+1)))
val a_inc = in.a.fire() && a_first && a_sel
val d_dec = in.d.fire() && d_first && d_sel
count := count + a_inc.asUInt - d_dec.asUInt
when (in.a.fire() && a_sel) { id := a_id }
a_sel && a_first && count =/= UInt(0) && (a_nid || id =/= a_id)
}
val stall = stalls.foldLeft(Bool(false))(_||_)
out.a <> in.a
in.d <> out.d
out.a.valid := in.a.valid && !stall
in.a.ready := out.a.ready && !stall
if (edgeOut.manager.anySupportAcquireB && edgeOut.client.anySupportProbe) {
in .b <> out.b
out.c <> in .c
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 TLFIFOFixer
{
// applied to the TL source node; y.node := TLFIFOFixer()(x.node)
def apply()(x: TLOutwardNode)(implicit p: Parameters, sourceInfo: SourceInfo): TLOutwardNode = {
val fixer = LazyModule(new TLFIFOFixer)
fixer.node := x
fixer.node
}
}