/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright ( C ) 2014 Imagination Technologies
* Author : Paul Burton < paul . burton @ mips . com >
*/
#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__ */
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