xref: /XiangShan/src/main/scala/device/AXI4Flash.scala (revision c6d439803a044ea209139672b25e35fe8d7f4aa0) 
1/***************************************************************************************
2* Copyright (c) 2020-2021 Institute of Computing Technology, Chinese Academy of Sciences
3*
4* XiangShan is licensed under Mulan PSL v2.
5* You can use this software according to the terms and conditions of the Mulan PSL v2.
6* You may obtain a copy of Mulan PSL v2 at:
7*          http://license.coscl.org.cn/MulanPSL2
8*
9* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
10* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
11* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
12*
13* See the Mulan PSL v2 for more details.
14***************************************************************************************/
15
16package device
17
18import chisel3._
19import chisel3.util._
20import chipsalliance.rocketchip.config.Parameters
21import freechips.rocketchip.diplomacy.AddressSet
22import utils._
23
24class FlashHelper extends BlackBox with HasBlackBoxInline {
25  val io = IO(new Bundle {
26    val clk = Input(Clock())
27    val ren = Input(Bool())
28    val data = Output(UInt(64.W))
29    val addr = Input(UInt(32.W))
30  })
31
32  setInline("FlashHelper.v",
33    s"""
34       |import "DPI-C" function void flash_read
35       |(
36       |  input int addr,
37       |  output longint data
38       |);
39       |
40       |module FlashHelper (
41       |  input clk,
42       |  input [31:0] addr,
43       |  input ren,
44       |  output reg [63:0] data
45       |);
46       |
47       |  always @(posedge clk) begin
48       |    if (ren) flash_read(addr, data);
49       |  end
50       |
51       |endmodule
52     """.stripMargin)
53}
54
55
56class AXI4Flash
57(
58  address: Seq[AddressSet]
59)(implicit p: Parameters)
60  extends AXI4SlaveModule(address, executable = false)
61{
62
63  override lazy val module = new AXI4SlaveModuleImp(this){
64    def getOffset(addr: UInt) = addr(15,0)
65
66    val flash = Module(new FlashHelper)
67    flash.io.clk := clock
68    flash.io.ren := in.ar.fire()
69    flash.io.addr := Cat(0.U(16.W), getOffset(raddr))
70
71    in.r.bits.data := flash.io.data
72  }
73}
74