riscv/rocket-chip
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add System Control Register space to HTIF

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This commit is contained in:
Andrew Waterman 2013-01-24 23:41:24 -08:00
parent 575bd3445a
commit c890099e09
1 changed files with 30 additions and 5 deletions
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35
rocket/src/main/scala/htif.scala
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@ -36,6 +36,15 @@ class HTIFIO(ntiles: Int) extends Bundle
val ipi_rep = (new FIFOIO) { Bool() }.flip
}
class SCRIO extends Bundle
{
val n = 64
val rdata = Vec(n) { Bits(INPUT, 64) }
val wen = Bool(OUTPUT)
val waddr = UFix(OUTPUT, log2Up(n))
val wdata = Bits(OUTPUT, 64)
}
class rocketHTIF(w: Int)(implicit conf: CoherenceHubConfiguration) extends Component with ClientCoherenceAgent
{
implicit val lnConf = conf.ln
@ -43,6 +52,7 @@ class rocketHTIF(w: Int)(implicit conf: CoherenceHubConfiguration) extends Compo
val host = new HostIO(w)
val cpu = Vec(conf.ln.nTiles) { new HTIFIO(conf.ln.nTiles).flip }
val mem = new TileLinkIO()(conf.ln)
val scr = new SCRIO
}
val short_request_bits = 64
@ -82,7 +92,7 @@ class rocketHTIF(w: Int)(implicit conf: CoherenceHubConfiguration) extends Compo
val cmd_readmem :: cmd_writemem :: cmd_readcr :: cmd_writecr :: cmd_ack :: cmd_nack :: Nil = Enum(6) { UFix() }
val pcr_addr = addr(io.cpu(0).pcr_req.bits.addr.width-1, 0)
val pcr_coreid = if (conf.ln.nTiles == 1) UFix(0) else addr(20+log2Up(conf.ln.nTiles),20)
val pcr_coreid = addr(log2Up(conf.ln.nTiles+1)-1+20,20)
val pcr_wdata = packet_ram(0)
val bad_mem_packet = size(OFFSET_BITS-1-3,0).orR || addr(OFFSET_BITS-1-3,0).orR
@ -204,7 +214,7 @@ class rocketHTIF(w: Int)(implicit conf: CoherenceHubConfiguration) extends Compo
io.mem.grant_ack.bits.header.src := UFix(conf.ln.nTiles)
io.mem.grant_ack.bits.header.dst := UFix(0)
val pcrReadData = Vec(conf.ln.nTiles) { Reg() { Bits(width = io.cpu(0).pcr_rep.bits.getWidth) } }
val pcrReadData = Reg{Bits(width = io.cpu(0).pcr_rep.bits.getWidth)}
for (i <- 0 until conf.ln.nTiles) {
val my_reset = Reg(resetVal = Bool(true))
val my_ipi = Reg(resetVal = Bool(false))
@ -235,22 +245,37 @@ class rocketHTIF(w: Int)(implicit conf: CoherenceHubConfiguration) extends Compo
when (cmd === cmd_writecr) {
my_reset := pcr_wdata(0)
}
pcrReadData(i) := my_reset.toBits
pcrReadData := my_reset.toBits
state := state_tx
}
cpu.pcr_rep.ready := Bool(true)
when (cpu.pcr_rep.valid) {
pcrReadData(i) := cpu.pcr_rep.bits
pcrReadData := cpu.pcr_rep.bits
state := state_tx
}
}
val scr_rdata = Vec(io.scr.rdata.size){Bits(width = 64)}
for (i <- 0 until scr_rdata.size)
scr_rdata(i) := io.scr.rdata(i)
scr_rdata(0) := conf.ln.nTiles
scr_rdata(1) := UFix(REFILL_CYCLES*MEM_DATA_BITS/8) << x_init.io.enq.bits.addr.getWidth
io.scr.wen := false
io.scr.wdata := pcr_wdata
io.scr.waddr := pcr_addr.toUFix
when (state === state_pcr_req && pcr_coreid === Fix(-1)) {
io.scr.wen := cmd === cmd_writecr
pcrReadData := scr_rdata(pcr_addr)
state := state_tx
}
val tx_cmd = Mux(nack, cmd_nack, cmd_ack)
val tx_cmd_ext = Cat(Bits(0, 4-tx_cmd.getWidth), tx_cmd)
val tx_header = Cat(addr, seqno, tx_size, tx_cmd_ext)
val tx_data = Mux(tx_word_count === UFix(0), tx_header,
Mux(cmd === cmd_readcr || cmd === cmd_writecr, pcrReadData(pcr_coreid),
Mux(cmd === cmd_readcr || cmd === cmd_writecr, pcrReadData,
packet_ram(packet_ram_raddr)))
io.host.in.ready := state === state_rx