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 utils 18 19import chisel3._ 20import chisel3.util._ 21 22/* WFI state Update */ 23object WfiStateNext { 24 val sNORMAL :: sGCLOCK :: sAWAKE :: sFLITWAKE :: Nil = Enum(4) 25 26 def apply(wfiState: UInt, isWFI: Bool, isNormal: Bool, flitpend: Bool, intSrc: UInt): UInt = { 27 val nextState = MuxCase(wfiState, Array( 28 (wfiState === sNORMAL && isWFI && isNormal && !intSrc.orR) -> sGCLOCK, 29 (wfiState === sGCLOCK && intSrc.orR) -> sAWAKE, 30 (wfiState === sGCLOCK && flitpend) -> sFLITWAKE, 31 (wfiState === sFLITWAKE && ~isWFI) -> sNORMAL, 32 (wfiState === sAWAKE && !intSrc.orR) -> sNORMAL 33 ).toIndexedSeq) 34 35 nextState 36 } 37} 38 39/* Core low power state Update */ 40object lpStateNext { 41 val sIDLE :: sL2FLUSH :: sWAITWFI :: sEXITCO :: sPOFFREQ :: Nil = Enum(5) 42 43 def apply(lpState: UInt, l2flush: Bool, l2FlushDone: Bool, isWFI: Bool, exitco: Bool): UInt = { 44 val nextState = MuxCase(lpState, Array( 45 (lpState === sIDLE && l2flush) -> sL2FLUSH, 46 (lpState === sL2FLUSH && l2FlushDone) -> sWAITWFI, 47 (lpState === sWAITWFI && isWFI ) -> sEXITCO, 48 (lpState === sEXITCO && exitco ) -> sPOFFREQ 49 ).toIndexedSeq) 50 51 nextState 52 } 53} 54