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Linux kernel mirror (for testing)
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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 */
28enum 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 */
41extern 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 */
51extern int cps_pm_enter_state(enum cps_pm_state state);
52
53#endif /* __MIPS_ASM_PM_CPS_H__ */