1/*************************************************************************************** 2* Copyright (c) 2020-2021 Institute of Computing Technology, Chinese Academy of Sciences 3* Copyright (c) 2020-2021 Peng Cheng Laboratory 4* 5* XiangShan is licensed under Mulan PSL v2. 6* You can use this software according to the terms and conditions of the Mulan PSL v2. 7* You may obtain a copy of Mulan PSL v2 at: 8* http://license.coscl.org.cn/MulanPSL2 9* 10* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, 11* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, 12* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. 13* 14* See the Mulan PSL v2 for more details. 15***************************************************************************************/ 16 17package device 18 19import chisel3._ 20import chisel3.util._ 21import org.chipsalliance.cde.config.Parameters 22import freechips.rocketchip.diplomacy.AddressSet 23import utils._ 24import utility._ 25import difftest._ 26 27class AXI4UART 28( 29 address: Seq[AddressSet] 30)(implicit p: Parameters) 31 extends AXI4SlaveModule(address, executable = false, _extra = new UARTIO) 32{ 33 override lazy val module = new AXI4SlaveModuleImp[UARTIO](this){ 34 val rxfifo = RegInit(0.U(32.W)) 35 val txfifo = Reg(UInt(32.W)) 36 val stat = RegInit(0.U(32.W)) 37 val ctrl = RegInit(0.U(32.W)) 38 39 val txDataPos = (4 % node.portParams.head.beatBytes) * 8; 40 41 io.extra.get.out.valid := (waddr(3,0) === 4.U && in.w.fire) 42 io.extra.get.out.ch := in.w.bits.data(7 + txDataPos, txDataPos) 43 io.extra.get.in.valid := (raddr(3,0) === 0.U && in.r.fire) 44 45 val mapping = Map( 46 RegMap(0x0, io.extra.get.in.ch, RegMap.Unwritable), 47 RegMap(0x4, txfifo), 48 RegMap(0x8, stat), 49 RegMap(0xc, ctrl) 50 ) 51 52 RegMap.generate(mapping, raddr(3,0), in.r.bits.data, 53 waddr(3,0), in.w.fire, in.w.bits.data, MaskExpand(in.w.bits.strb >> waddr(2,0)) 54 ) 55 } 56} 57