| /* | |
| * Copyright (C) 2014 Imagination Technologies | |
| * Author: Paul Burton <paul.burton@imgtec.com> | |
| * | |
| * This program is free software; you can redistribute it and/or modify it | |
| * under the terms of the GNU General Public License as published by the | |
| * Free Software Foundation; either version 2 of the License, or (at your | |
| * option) any later version. | |
| */ | |
| #ifndef __MIPS_ASM_PM_CPS_H__ | |
| #define __MIPS_ASM_PM_CPS_H__ | |
| /* | |
| * The CM & CPC can only handle coherence & power control on a per-core basis, | |
| * thus in an MT system the VP(E)s within each core are coupled and can only | |
| * enter or exit states requiring CM or CPC assistance in unison. | |
| */ | |
| #if defined(CONFIG_CPU_MIPSR6) | |
| # define coupled_coherence cpu_has_vp | |
| #elif defined(CONFIG_MIPS_MT) | |
| # define coupled_coherence cpu_has_mipsmt | |
| #else | |
| # define coupled_coherence 0 | |
| #endif | |
| /* Enumeration of possible PM states */ | |
| enum cps_pm_state { | |
| CPS_PM_NC_WAIT, /* MIPS wait instruction, non-coherent */ | |
| CPS_PM_CLOCK_GATED, /* Core clock gated */ | |
| CPS_PM_POWER_GATED, /* Core power gated */ | |
| CPS_PM_STATE_COUNT, | |
| }; | |
| /** | |
| * cps_pm_support_state - determine whether the system supports a PM state | |
| * @state: the state to test for support | |
| * | |
| * Returns true if the system supports the given state, otherwise false. | |
| */ | |
| extern bool cps_pm_support_state(enum cps_pm_state state); | |
| /** | |
| * cps_pm_enter_state - enter a PM state | |
| * @state: the state to enter | |
| * | |
| * Enter the given PM state. If coupled_coherence is non-zero then it is | |
| * expected that this function be called at approximately the same time on | |
| * each coupled CPU. Returns 0 on successful entry & exit, otherwise -errno. | |
| */ | |
| extern int cps_pm_enter_state(enum cps_pm_state state); | |
| #endif /* __MIPS_ASM_PM_CPS_H__ */ |