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rocket-chip/src/main/scala/tilelink/AsyncCrossing.scala

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Scala
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// See LICENSE.SiFive for license details.
package freechips.rocketchip.tilelink
import Chisel._
import chisel3.internal.sourceinfo.SourceInfo
import freechips.rocketchip.config.Parameters
import freechips.rocketchip.diplomacy._
import freechips.rocketchip.util._
class TLAsyncCrossingSource(sync: Int = 3)(implicit p: Parameters) extends LazyModule
{
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val node = TLAsyncSourceNode(sync)
lazy val module = new LazyModuleImp(this) {
(node.in zip node.out) foreach { case ((in, edgeIn), (out, edgeOut)) =>
val sink_reset_n = out.a.sink_reset_n
val bce = edgeIn.manager.anySupportAcquireB && edgeIn.client.anySupportProbe
val depth = edgeOut.manager.depth
out.a <> ToAsyncBundle(in.a, depth, sync)
in.d <> FromAsyncBundle(out.d, sync)
if (bce) {
in.b <> FromAsyncBundle(out.b, sync)
out.c <> ToAsyncBundle(in.c, depth, sync)
out.e <> ToAsyncBundle(in.e, depth, sync)
} else {
in.b.valid := Bool(false)
in.c.ready := Bool(true)
in.e.ready := Bool(true)
out.b.ridx := UInt(0)
out.c.widx := UInt(0)
out.e.widx := UInt(0)
}
}
}
}
class TLAsyncCrossingSink(depth: Int = 8, sync: Int = 3)(implicit p: Parameters) extends LazyModule
{
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val node = TLAsyncSinkNode(depth, sync)
lazy val module = new LazyModuleImp(this) {
(node.in zip node.out) foreach { case ((in, edgeIn), (out, edgeOut)) =>
val source_reset_n = in.a.source_reset_n
val bce = edgeOut.manager.anySupportAcquireB && edgeOut.client.anySupportProbe
out.a <> FromAsyncBundle(in.a, sync)
in.d <> ToAsyncBundle(out.d, depth, sync)
if (bce) {
in.b <> ToAsyncBundle(out.b, depth, sync)
out.c <> FromAsyncBundle(in.c, sync)
out.e <> FromAsyncBundle(in.e, sync)
} else {
in.b.widx := UInt(0)
in.c.ridx := UInt(0)
in.e.ridx := UInt(0)
out.b.ready := Bool(true)
out.c.valid := Bool(false)
out.e.valid := Bool(false)
}
}
}
}
object TLAsyncCrossingSource
{
// applied to the TL source node; y.node := TLAsyncCrossingSource()(x.node)
def apply(sync: Int = 3)(x: TLOutwardNode)(implicit p: Parameters, sourceInfo: SourceInfo): TLAsyncOutwardNode = {
val source = LazyModule(new TLAsyncCrossingSource(sync))
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source.node :=? x
source.node
}
}
object TLAsyncCrossingSink
{
// applied to the TL source node; y.node := TLAsyncCrossingSink()(x.node)
def apply(depth: Int = 8, sync: Int = 3)(x: TLAsyncOutwardNode)(implicit p: Parameters, sourceInfo: SourceInfo): TLOutwardNode = {
val sink = LazyModule(new TLAsyncCrossingSink(depth, sync))
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sink.node :=? x
sink.node
}
}
class TLAsyncCrossing(depth: Int = 8, sync: Int = 3)(implicit p: Parameters) extends LazyModule
{
val nodeIn = TLIdentityNode()
val nodeOut = TLIdentityNode()
val node = NodeHandle(nodeIn, nodeOut)
val source = LazyModule(new TLAsyncCrossingSource(sync))
val sink = LazyModule(new TLAsyncCrossingSink(depth, sync))
val _ = (sink.node := source.node) // no monitor
val in = (source.node := nodeIn)
val out = (nodeOut := sink.node)
lazy val module = new LazyModuleImp(this) {
val io = IO(new Bundle {
val in_clock = Clock(INPUT)
val in_reset = Bool(INPUT)
val out_clock = Clock(INPUT)
val out_reset = Bool(INPUT)
})
source.module.clock := io.in_clock
source.module.reset := io.in_reset
in.foreach { lm =>
lm.module.clock := io.in_clock
lm.module.reset := io.in_reset
}
sink.module.clock := io.out_clock
sink.module.reset := io.out_reset
out.foreach { lm =>
lm.module.clock := io.out_clock
lm.module.reset := io.out_reset
}
}
}
/** Synthesizeable unit tests */
import freechips.rocketchip.unittest._
class TLRAMAsyncCrossing(txns: Int)(implicit p: Parameters) extends LazyModule {
val model = LazyModule(new TLRAMModel("AsyncCrossing"))
val ram = LazyModule(new TLRAM(AddressSet(0x0, 0x3ff)))
val fuzz = LazyModule(new TLFuzzer(txns))
val cross = LazyModule(new TLAsyncCrossing)
model.node := fuzz.node
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cross.node := TLFragmenter(4, 256)(TLDelayer(0.1)(model.node))
val monitor = (ram.node := cross.node)
lazy val module = new LazyModuleImp(this) with UnitTestModule {
io.finished := fuzz.module.io.finished
// Shove the RAM into another clock domain
val clocks = Module(new Pow2ClockDivider(2))
ram.module.clock := clocks.io.clock_out
// ... and safely cross TL2 into it
cross.module.io.in_clock := clock
cross.module.io.in_reset := reset
cross.module.io.out_clock := clocks.io.clock_out
cross.module.io.out_reset := reset
// Push the Monitor into the right clock domain
monitor.foreach { m =>
m.module.clock := clocks.io.clock_out
m.module.reset := reset
}
}
}
class TLRAMAsyncCrossingTest(txns: Int = 5000, timeout: Int = 500000)(implicit p: Parameters) extends UnitTest(timeout) {
io.finished := Module(LazyModule(new TLRAMAsyncCrossing(txns)).module).io.finished
}