1 /* 2 * Copyright (C) 2014 Imagination Technologies 3 * Author: Paul Burton <paul.burton@imgtec.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 */ 10 11 #ifndef __MIPS_ASM_PM_CPS_H__ 12 #define __MIPS_ASM_PM_CPS_H__ 13 14 /* 15 * The CM & CPC can only handle coherence & power control on a per-core basis, 16 * thus in an MT system the VP(E)s within each core are coupled and can only 17 * enter or exit states requiring CM or CPC assistance in unison. 18 */ 19 #if defined(CONFIG_CPU_MIPSR6) 20 # define coupled_coherence cpu_has_vp 21 #elif defined(CONFIG_MIPS_MT) 22 # define coupled_coherence cpu_has_mipsmt 23 #else 24 # define coupled_coherence 0 25 #endif 26 27 /* Enumeration of possible PM states */ 28 enum cps_pm_state { 29 CPS_PM_NC_WAIT, /* MIPS wait instruction, non-coherent */ 30 CPS_PM_CLOCK_GATED, /* Core clock gated */ 31 CPS_PM_POWER_GATED, /* Core power gated */ 32 CPS_PM_STATE_COUNT, 33 }; 34 35 /** 36 * cps_pm_support_state - determine whether the system supports a PM state 37 * @state: the state to test for support 38 * 39 * Returns true if the system supports the given state, otherwise false. 40 */ 41 extern bool cps_pm_support_state(enum cps_pm_state state); 42 43 /** 44 * cps_pm_enter_state - enter a PM state 45 * @state: the state to enter 46 * 47 * Enter the given PM state. If coupled_coherence is non-zero then it is 48 * expected that this function be called at approximately the same time on 49 * each coupled CPU. Returns 0 on successful entry & exit, otherwise -errno. 50 */ 51 extern int cps_pm_enter_state(enum cps_pm_state state); 52 53 #endif /* __MIPS_ASM_PM_CPS_H__ */ 54