| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software 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. |
| */ |
| |
| package vta.dpi |
| |
| import chisel3._ |
| import chisel3.util._ |
| import vta.util.config._ |
| import vta.interface.axi._ |
| import vta.shell._ |
| |
| /** Host DPI parameters */ |
| trait VTAHostDPIParams { |
| val dpiAddrBits = 8 |
| val dpiDataBits = 32 |
| } |
| |
| /** Host master interface. |
| * |
| * This interface is tipically used by the Host |
| */ |
| class VTAHostDPIMaster extends Bundle with VTAHostDPIParams { |
| val req = new Bundle { |
| val valid = Output(Bool()) |
| val opcode = Output(Bool()) |
| val addr = Output(UInt(dpiAddrBits.W)) |
| val value = Output(UInt(dpiDataBits.W)) |
| val deq = Input(Bool()) |
| } |
| val resp = Flipped(ValidIO(UInt(dpiDataBits.W))) |
| } |
| |
| /** Host client interface. |
| * |
| * This interface is tipically used by the Accelerator |
| */ |
| class VTAHostDPIClient extends Bundle with VTAHostDPIParams { |
| val req = new Bundle { |
| val valid = Input(Bool()) |
| val opcode = Input(Bool()) |
| val addr = Input(UInt(dpiAddrBits.W)) |
| val value = Input(UInt(dpiDataBits.W)) |
| val deq = Output(Bool()) |
| } |
| val resp = ValidIO(UInt(dpiDataBits.W)) |
| } |
| |
| /** Host DPI module. |
| * |
| * Wrapper for Host Verilog DPI module. |
| */ |
| class VTAHostDPI extends BlackBox with HasBlackBoxResource { |
| val io = IO(new Bundle { |
| val clock = Input(Clock()) |
| val reset = Input(Bool()) |
| val dpi = new VTAHostDPIMaster |
| }) |
| addResource("/verilog/VTAHostDPI.v") |
| } |
| |
| /** Host DPI to AXI Converter. |
| * |
| * Convert Host DPI to AXI for VTAShell |
| */ |
| class VTAHostDPIToAXI(debug: Boolean = false)(implicit p: Parameters) extends Module { |
| val io = IO(new Bundle { |
| val dpi = new VTAHostDPIClient |
| val axi = new AXILiteMaster(p(ShellKey).hostParams) |
| }) |
| val addr = RegInit(0.U.asTypeOf(chiselTypeOf(io.dpi.req.addr))) |
| val data = RegInit(0.U.asTypeOf(chiselTypeOf(io.dpi.req.value))) |
| val sIdle :: sReadAddress :: sReadData :: sWriteAddress :: sWriteData :: sWriteResponse :: Nil = |
| Enum(6) |
| val state = RegInit(sIdle) |
| |
| switch(state) { |
| is(sIdle) { |
| when(io.dpi.req.valid) { |
| when(io.dpi.req.opcode) { |
| state := sWriteAddress |
| }.otherwise { |
| state := sReadAddress |
| } |
| } |
| } |
| is(sReadAddress) { |
| when(io.axi.ar.ready) { |
| state := sReadData |
| } |
| } |
| is(sReadData) { |
| when(io.axi.r.valid) { |
| state := sIdle |
| } |
| } |
| is(sWriteAddress) { |
| when(io.axi.aw.ready) { |
| state := sWriteData |
| } |
| } |
| is(sWriteData) { |
| when(io.axi.w.ready) { |
| state := sWriteResponse |
| } |
| } |
| is(sWriteResponse) { |
| when(io.axi.b.valid) { |
| state := sIdle |
| } |
| } |
| } |
| |
| when(state === sIdle && io.dpi.req.valid) { |
| addr := io.dpi.req.addr |
| data := io.dpi.req.value |
| } |
| |
| io.axi.aw.valid := state === sWriteAddress |
| io.axi.aw.bits.addr := addr |
| io.axi.w.valid := state === sWriteData |
| io.axi.w.bits.data := data |
| io.axi.w.bits.strb := "h_f".U |
| io.axi.b.ready := state === sWriteResponse |
| |
| io.axi.ar.valid := state === sReadAddress |
| io.axi.ar.bits.addr := addr |
| io.axi.r.ready := state === sReadData |
| |
| io.dpi.req.deq := (state === sReadAddress & io.axi.ar.ready) | (state === sWriteAddress & io.axi.aw.ready) |
| io.dpi.resp.valid := io.axi.r.valid |
| io.dpi.resp.bits := io.axi.r.bits.data |
| |
| if (debug) { |
| when(state === sWriteAddress && io.axi.aw.ready) { |
| printf("[VTAHostDPIToAXI] [AW] addr:%x\n", addr) |
| } |
| when(state === sReadAddress && io.axi.ar.ready) { |
| printf("[VTAHostDPIToAXI] [AR] addr:%x\n", addr) |
| } |
| when(io.axi.r.fire()) { |
| printf("[VTAHostDPIToAXI] [R] value:%x\n", io.axi.r.bits.data) |
| } |
| when(io.axi.w.fire()) { |
| printf("[VTAHostDPIToAXI] [W] value:%x\n", io.axi.w.bits.data) |
| } |
| } |
| } |