riscv/rocket-chip
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switch RTC to use TileLink instead of AXI

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This commit is contained in:
Howard Mao 2016-03-28 12:23:16 -07:00
parent 7f8f138d6a
commit 8e7f18084b
1 changed files with 25 additions and 29 deletions
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54
uncore/src/main/scala/rtc.scala
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@ -7,62 +7,58 @@ import cde.{Parameters, Field}
case object RTCPeriod extends Field[Int]
class RTC(csr_MTIME: Int)(implicit p: Parameters) extends HtifModule
with HasTileLinkParameters
with HasAddrMapParameters {
val io = new NastiIO
val io = new ClientUncachedTileLinkIO
val addrTable = Vec.tabulate(nCores) { i =>
UInt(addrMap(s"conf:csr$i").start + csr_MTIME * csrDataBytes)
UInt(addrMap(s"conf:csr$i").start + csr_MTIME * csrDataBytes, p(PAddrBits))
}
val rtc = Reg(init=UInt(0, scrDataBits))
val rtc = Reg(init=UInt(0, csrDataBits))
val rtc_tick = Counter(p(RTCPeriod)).inc()
val sending_addr = Reg(init = Bool(false))
val sending_data = Reg(init = Bool(false))
val sending = Reg(init = Bool(false))
val send_acked = Reg(init = Vec.fill(nCores)(Bool(true)))
val coreId = Wire(UInt(width = log2Up(nCores)))
when (rtc_tick) {
rtc := rtc + UInt(1)
send_acked := Vec.fill(nCores)(Bool(false))
sending_addr := Bool(true)
sending_data := Bool(true)
sending := Bool(true)
}
if (nCores > 1) {
val (addr_send_cnt, addr_send_done) = Counter(io.aw.fire(), nCores)
val (_, data_send_done) = Counter(io.w.fire(), nCores)
val (send_cnt, send_done) = Counter(io.acquire.fire(), nCores)
when (addr_send_done) { sending_addr := Bool(false) }
when (data_send_done) { sending_data := Bool(false) }
when (send_done) { sending := Bool(false) }
coreId := addr_send_cnt
coreId := send_cnt
} else {
when (io.aw.fire()) { sending_addr := Bool(false) }
when (io.w.fire()) { sending_data := Bool(false) }
when (io.acquire.fire()) { sending := Bool(false) }
coreId := UInt(0)
}
when (io.b.fire()) { send_acked(io.b.bits.id) := Bool(true) }
when (io.grant.fire()) { send_acked(io.grant.bits.client_xact_id) := Bool(true) }
io.aw.valid := sending_addr
io.aw.bits := NastiWriteAddressChannel(
id = coreId,
addr = addrTable(coreId),
size = UInt(log2Up(csrDataBytes)))
require(p(MIFMasterTagBits) >= log2Up(nCores))
val addr_full = addrTable(coreId)
val addr_block = addr_full(p(PAddrBits) - 1, p(CacheBlockOffsetBits))
val addr_beat = addr_full(p(CacheBlockOffsetBits) - 1, tlByteAddrBits)
val addr_byte = addr_full(tlByteAddrBits - 1, 0)
val wmask = Fill(csrDataBytes, UInt(1, 1)) << addr_byte
io.w.valid := sending_data
io.w.bits := NastiWriteDataChannel(data = rtc)
io.acquire.valid := sending
io.acquire.bits := Put(
client_xact_id = coreId,
addr_block = addr_block,
addr_beat = addr_beat,
wmask = wmask,
data = Fill(tlDataBytes / csrDataBytes, rtc))
io.grant.ready := Bool(true)
io.b.ready := Bool(true)
io.ar.valid := Bool(false)
io.r.ready := Bool(false)
require(tlClientXactIdBits >= log2Up(nCores))
assert(!rtc_tick || send_acked.reduce(_ && _),
"Not all clocks were updated for rtc tick")
assert(!io.b.valid || io.b.bits.resp === UInt(0),
"RTC received NASTI error response")
}