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Allow narrow TL interface on PRCI; make mtime writable

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This commit is contained in:
Andrew Waterman 2016-09-02 14:48:16 -07:00
parent 6872000f5e
commit 7aeb42fa55
1 changed files with 20 additions and 19 deletions
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39
src/main/scala/uncore/devices/Prci.scala
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@ -3,10 +3,11 @@
package uncore.devices
import Chisel._
import Chisel.ImplicitConversions._
import rocket.Util._
import junctions._
import junctions.NastiConstants._
import uncore.tilelink._
import uncore.util._
import cde.{Parameters, Field}
/** Number of tiles */
@ -72,11 +73,11 @@ class PRCI(implicit val p: Parameters) extends Module
when (addr(log2Floor(PRCI.time))) {
require(log2Floor(PRCI.timecmp(p(NTiles)-1)) < log2Floor(PRCI.time))
rdata := load(Vec(time + UInt(0)), acq.bits)
rdata := store(Seq(time), acq.bits, io.tl.grant.fire())
}.elsewhen (addr >= PRCI.timecmp(0)) {
rdata := store(timecmp, acq.bits)
rdata := store(timecmp, acq.bits, io.tl.grant.fire())
}.otherwise {
rdata := store(ipi, acq.bits) & Fill(tlDataBits/32, UInt(1, 32))
rdata := store(ipi, acq.bits, io.tl.grant.fire()) & Fill(tlDataBits/32, UInt(1, 32))
}
for ((tile, i) <- io.tiles zipWithIndex) {
@ -87,40 +88,40 @@ class PRCI(implicit val p: Parameters) extends Module
}
// TODO generalize these to help other TL slaves
def load(v: Vec[UInt], acq: Acquire): UInt = {
def load(v: Seq[UInt], acq: Acquire): UInt = {
val w = v.head.getWidth
val a = acq.full_addr()
require(isPow2(w) && w >= 8)
if (w > tlDataBits) {
(v(a(log2Up(w/8*v.size)-1,log2Up(w/8))) >> a(log2Up(w/8)-1,log2Up(tlDataBytes)))(tlDataBits-1,0)
(v(a.extract(log2Ceil(w/8*v.size)-1,log2Ceil(w/8))) >> a.extract(log2Ceil(w/8)-1,log2Ceil(tlDataBytes)))(tlDataBits-1,0)
} else {
val row = for (i <- 0 until v.size by tlDataBits/w)
val row: Seq[UInt] = for (i <- 0 until v.size by tlDataBits/w)
yield Cat(v.slice(i, i + tlDataBits/w).reverse)
if (row.size == 1) row.head
else Vec(row)(a(log2Up(w/8*v.size)-1,log2Up(tlDataBytes)))
else row(a(log2Ceil(w/8*v.size)-1,log2Ceil(tlDataBytes)))
}
}
def store(v: Vec[UInt], acq: Acquire): UInt = {
def store(v: Seq[UInt], acq: Acquire, en: Bool): UInt = {
val w = v.head.getWidth
require(isPow2(w) && w >= 8)
val a = acq.full_addr()
val rdata = load(v, acq)
val wdata = (acq.data & acq.full_wmask()) | (rdata & ~acq.full_wmask())
if (w <= tlDataBits) {
val word =
if (tlDataBits/w >= v.size) UInt(0)
else a(log2Up(w/8*v.size)-1,log2Up(tlDataBytes))
for (i <- 0 until v.size) {
when (acq.isBuiltInType(Acquire.putType) && word === i/(tlDataBits/w)) {
when (en && acq.isBuiltInType(Acquire.putType)) {
if (w <= tlDataBits) {
val word =
if (tlDataBits/w >= v.size) UInt(0)
else a(log2Up(w/8*v.size)-1,log2Up(tlDataBytes))
for (i <- 0 until v.size) when (word === i/(tlDataBits/w)) {
val base = i % (tlDataBits/w)
v(i) := wdata >> (w * (i % (tlDataBits/w)))
}
} else {
val i = a.extract(log2Ceil(w/8*v.size)-1,log2Ceil(w/8))
val mask = FillInterleaved(tlDataBits, UIntToOH(a.extract(log2Ceil(w/8)-1,log2Ceil(tlDataBytes))))
v(i) := (wdata & mask) | (v(i) & ~mask)
}
} else {
val i = a(log2Up(w/8*v.size)-1,log2Up(w/8))
val mask = FillInterleaved(tlDataBits, UIntToOH(a(log2Up(w/8)-1,log2Up(tlDataBytes))))
v(i) := (wdata & mask) | (v(i) & ~mask)
}
rdata
}