pm-cps.h
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/*
* 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 VPEs within each core are coupled and can only
* enter or exit states requiring CM or CPC assistance in unison.
*/
#ifdef 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__ */