riscv/rocket-chip
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fix htif split request/response

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This commit is contained in:
Andrew Waterman 2012-07-23 17:15:16 -07:00
parent 938effc053
commit a21c355114
1 changed files with 12 additions and 14 deletions
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22
rocket/src/main/scala/htif.scala
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@ -108,21 +108,16 @@ class rocketHTIF(w: Int, ncores: Int, co: CoherencePolicyWithUncached) extends C
io.mem.xact_rep.ready := Bool(true)
when (io.mem.xact_abort.valid) { mem_nacked := Bool(true) }
val state_rx :: state_pcr :: state_mem_req :: state_mem_wdata :: state_mem_wresp :: state_mem_rdata :: state_mem_finish :: state_tx :: Nil = Enum(8) { UFix() }
val state_rx :: state_pcr_req :: state_pcr_resp :: state_mem_req :: state_mem_wdata :: state_mem_wresp :: state_mem_rdata :: state_mem_finish :: state_tx :: Nil = Enum(9) { UFix() }
val state = Reg(resetVal = state_rx)
when (state === state_rx && rx_done) {
val rx_cmd = Mux(rx_word_count === UFix(0), next_cmd, cmd)
state := Mux(rx_cmd === cmd_readmem || rx_cmd === cmd_writemem, state_mem_req,
Mux(rx_cmd === cmd_readcr || rx_cmd === cmd_writecr, state_pcr,
Mux(rx_cmd === cmd_readcr || rx_cmd === cmd_writecr, state_pcr_req,
state_tx))
}
val pcr_done = Reg() { Bool() }
when (state === state_pcr && pcr_done) {
state := state_tx
}
val mem_cnt = Reg(resetVal = UFix(0, log2Up(REFILL_CYCLES)))
when (state === state_mem_req && io.mem.xact_init.ready) {
state := Mux(cmd === cmd_writemem, state_mem_wdata, state_mem_rdata)
@ -189,7 +184,6 @@ class rocketHTIF(w: Int, ncores: Int, co: CoherencePolicyWithUncached) extends C
io.mem.probe_rep_data.valid := Bool(false)
io.mem.incoherent := Bool(true)
pcr_done := Bool(false)
val pcr_mux = (new Mux1H(ncores)) { Bits(width = 64) }
for (i <- 0 until ncores) {
val my_reset = Reg(resetVal = Bool(true))
@ -198,7 +192,7 @@ class rocketHTIF(w: Int, ncores: Int, co: CoherencePolicyWithUncached) extends C
val cpu = io.cpu(i)
val me = pcr_coreid === UFix(i)
cpu.pcr_req.valid := my_ipi || state === state_pcr && me
cpu.pcr_req.valid := my_ipi || state === state_pcr_req && me
cpu.pcr_req.bits.rw := my_ipi || cmd === cmd_writecr
cpu.pcr_req.bits.addr := Mux(my_ipi, PCR_CLR_IPI, pcr_addr)
cpu.pcr_req.bits.data := my_ipi | pcr_wdata
@ -214,17 +208,21 @@ class rocketHTIF(w: Int, ncores: Int, co: CoherencePolicyWithUncached) extends C
my_ipi := !cpu.pcr_req.ready
}
when (state === state_pcr && me && cmd === cmd_writecr) {
pcr_done := cpu.pcr_req.ready && !my_ipi
when (state === state_pcr_req && me && !my_ipi && cpu.pcr_req.ready) {
when (cmd === cmd_writecr) {
state := state_tx
when (pcr_addr === PCR_RESET) {
my_reset := pcr_wdata(0)
}
}.otherwise {
state := state_pcr_resp
}
}
cpu.pcr_rep.ready := Bool(true)
when (cpu.pcr_rep.valid) {
pcr_done := Bool(true)
rdata := cpu.pcr_rep.bits
state := state_tx
}
pcr_mux.io.sel(i) := me