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StatusDevice.bsv
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StatusDevice.bsv
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/*
* Copyright (c) 2022 Simon W. Moore
* All rights reserved.
*
* @BERI_LICENSE_HEADER_START@
*
* Licensed to BERI Open Systems C.I.C. (BERI) under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. BERI licenses this
* file to you under the BERI Hardware-Software License, Version 1.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
*
* http://www.beri-open-systems.org/legal/license-1-0.txt
*
* Unless required by applicable law or agreed to in writing, Work distributed
* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
* CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* @BERI_LICENSE_HEADER_END@
*
* ----------------------------------------------------------------------------
*
* Status Device
*
* A simple memory mapped device that allows status bits from a number of
* 32b conduits, and to read the unique Stratix-10 ChipID.
*
* TODO: how to get error_rx and error_tx captured since the bits change
* momentarily and at a higher clock frequency (TX and RX clocks)
*/
package StatusDevice;
import Vector :: *;
import GetPut :: *;
import DReg :: *;
import BlueAXI4 :: *;
import BlueBasics :: *;
import ChipID :: *;
(* always_ready, always_enabled*)
interface StatusConduits #(numeric type n);
// conduit interfaces
// TODO: it might be better to have a vector of conduits, though naming might be a challenge
method Action status_a(Bit#(n) coe);
method Action status_b(Bit#(n) coe);
method Action status_c(Bit#(n) coe);
method Action status_d(Bit#(n) coe);
endinterface
interface StatusDevice#(
numeric type t_addr
, numeric type t_awuser, numeric type t_wuser, numeric type t_buser
, numeric type t_aruser, numeric type t_ruser
, numeric type t_status_sz
);
// memory slave for control/status registers
interface AXI4Lite_Slave #( t_addr, 32
, t_awuser, t_wuser, t_buser
, t_aruser, t_ruser) mem_csrs;
interface StatusConduits #(t_status_sz) status;
endinterface
interface StatusDevice_Sig#(
numeric type t_addr
, numeric type t_awuser, numeric type t_wuser, numeric type t_buser
, numeric type t_aruser, numeric type t_ruser
, numeric type t_status_sz
);
(* prefix = "axls_mem_csrs" *)
interface AXI4Lite_Slave_Sig #( t_addr, 32
, t_awuser, t_wuser, t_buser
, t_aruser, t_ruser) mem_csrs;
(* prefix = "coe" *)
interface StatusConduits #(t_status_sz) status;
endinterface
module mkStatusDevice(StatusDevice#(t_addr, t_awuser, t_wuser, t_buser, t_aruser, t_ruser, t_status_sz) ifc)
provisos (Add #(__a, t_status_sz, 32));
Vector#(4, Reg#(Bit#(t_status_sz))) status_regs <- replicateM(mkReg(0));
Vector#(4, Reg#(Bit#(t_status_sz))) status_regs_latch <- replicateM(mkReg(0));
Vector#(4, Reg#(Bool)) zero_status_reg <- replicateM(mkDReg(False));
Reg#(Bit#(64)) chip_id <- mkReg(0);
Reg#(Bool) chip_id_valid <- mkReg(False);
Get#(Bit#(64)) get_chip_id <- mkChipID;
let axiShim <- mkAXI4LiteShimFF;
rule get_chip_id_once(!chip_id_valid);
chip_id_valid <= True;
let result_get_chip_id <- get_chip_id.get();
chip_id <= result_get_chip_id;
endrule
for(Integer j=0; j<4; j=j+1)
rule record_status_errors;
if(zero_status_reg[j])
status_regs_latch[j] <= 0;
else
status_regs_latch[j] <= status_regs_latch[j] | status_regs[j];
endrule
rule read_req;
let r <- get (axiShim.master.ar);
Bit#(32) d = 32'hdeaddead;
Bit#(3) word_addr =r.araddr[4:2];
if(word_addr[2]==0) // word_addr<4
begin
d = zeroExtend(status_regs[word_addr[1:0]]);
zero_status_reg[word_addr[1:0]] <= True;
end
if(word_addr==4)
d = chip_id[31:0];
if(word_addr==5)
d = chip_id[63:32];
let rsp = AXI4Lite_RFlit { rdata: d
, rresp: OKAY
, ruser: ? };
axiShim.master.r.put (rsp);
endrule
// write requests handling, i.e. always ignnore write and return success
rule write_req;
// ignore writes
// let aw <- get (axiShim.master.aw);
// let w <- get (axiShim.master.w);
let rsp = AXI4Lite_BFlit { bresp: OKAY, buser: ? };
axiShim.master.b.put (rsp);
endrule
// interface
interface mem_csrs = axiShim.slave;
interface StatusConduits status;
method Action status_a(Bit#(t_status_sz) coe); status_regs[0] <= coe; endmethod
method Action status_b(Bit#(t_status_sz) coe); status_regs[1] <= coe; endmethod
method Action status_c(Bit#(t_status_sz) coe); status_regs[2] <= coe; endmethod
method Action status_d(Bit#(t_status_sz) coe); status_regs[3] <= coe; endmethod
endinterface
endmodule
module toStatusDevice_Sig#(StatusDevice#(t_addr, t_awuser, t_wuser, t_buser, t_aruser, t_ruser, t_status_sz) ifc)
(StatusDevice_Sig#(t_addr, t_awuser, t_wuser, t_buser, t_aruser, t_ruser, t_status_sz));
let sigAXI4LitePort <- toAXI4Lite_Slave_Sig(ifc.mem_csrs);
return interface StatusDevice_Sig;
interface mem_csrs = sigAXI4LitePort;
interface status = ifc.status;
endinterface;
endmodule
(* synthesize *)
module mkStatusDevice_Instance(StatusDevice_Sig#(
// t_addr, t_awuser, t_wuser, t_buser, t_aruser, t_ruser, t_status_sz
5, 0, 0, 0, 0, 0, 32) sd);
let sd <- mkStatusDevice();
let sd_sig <- toStatusDevice_Sig(sd);
return sd_sig;
endmodule
(* synthesize *)
module mkStatusDevice_Instance_Status15(StatusDevice_Sig#(
// t_addr, t_awuser, t_wuser, t_buser, t_aruser, t_ruser, t_status_sz
5, 0, 0, 0, 0, 0, 15) sd);
let sd <- mkStatusDevice();
let sd_sig <- toStatusDevice_Sig(sd);
return sd_sig;
endmodule
endpackage