mirror of https://gitee.com/openkylin/linux.git
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
|
/*
|
||
|
|
* 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__ */
|