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rocket-chip/uncore/src/main/scala/prci.scala
Andrew Waterman cc4102f8de Add trivial version of PRCI block
It doesn't really do anything besides deliver deliver IPIs yet.
2016-05-02 17:49:10 -07:00

71 lines
1.8 KiB
Scala

// See LICENSE for license details.
package uncore
import Chisel._
import Chisel.ImplicitConversions._
import junctions._
import junctions.NastiConstants._
import cde.{Parameters, Field}
/** Number of tiles */
case object NTiles extends Field[Int]
class PRCITileIO(implicit p: Parameters) extends Bundle {
val reset = Bool(OUTPUT)
val id = UInt(OUTPUT, log2Up(p(NTiles)))
val interrupts = new Bundle {
val mtip = Bool()
val msip = Bool()
val meip = Bool()
val seip = Bool()
val debug = Bool()
}.asOutput
override def cloneType: this.type = new PRCITileIO().asInstanceOf[this.type]
}
class PRCI(implicit val p: Parameters) extends Module
with HasTileLinkParameters
with HasAddrMapParameters {
val io = new Bundle {
val id = UInt(INPUT, log2Up(p(NTiles)))
val interrupts = new Bundle {
val mtip = Bool()
val meip = Bool()
val seip = Bool()
val debug = Bool()
}.asInput
val tl = new ClientUncachedTileLinkIO().flip
val tile = new PRCITileIO
}
val ipi = Reg(init=Bool(false))
val acq = Queue(io.tl.acquire, 1)
val read = acq.bits.isBuiltInType(Acquire.getType)
val write = acq.bits.isBuiltInType(Acquire.putType)
val rdata = Wire(init=ipi)
io.tl.grant.valid := acq.valid
acq.ready := io.tl.grant.ready
io.tl.grant.bits := Grant(
is_builtin_type = Bool(true),
g_type = acq.bits.getBuiltInGrantType(),
client_xact_id = acq.bits.client_xact_id,
manager_xact_id = UInt(0),
addr_beat = UInt(0),
data = rdata)
val regSize = 16
val nRegs = 2
val addr = acq.bits.full_addr()(log2Up(regSize*nRegs)-1,log2Up(regSize))
when (addr === UInt(0) && write) {
ipi := acq.bits.data(0)
}
io.tile.interrupts := io.interrupts
io.tile.interrupts.msip := ipi
io.tile.id := io.id
}