projects / linux-block.git / blame
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|---|---|---|
| 3179d37e PB |
1 | /* |
| 2 | * Copyright (C) 2014 Imagination Technologies | |
| 48c834be | 3 | * Author: Paul Burton <paul.burton@mips.com> |
| 3179d37e PB |
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, | |
| 929d4f51 | 16 | * thus in an MT system the VP(E)s within each core are coupled and can only |
| 3179d37e PB |
17 | * enter or exit states requiring CM or CPC assistance in unison. |
| 18 | */ | |
| 929d4f51 MR |
19 | #if defined(CONFIG_CPU_MIPSR6) |
| 20 | # define coupled_coherence cpu_has_vp | |
| 21 | #elif defined(CONFIG_MIPS_MT) | |
| 3179d37e PB |
22 | # define coupled_coherence cpu_has_mipsmt |
| 23 | #else | |
| 24 | # define coupled_coherence 0 | |
| 25 | #endif | |
| 26 | ||
| 27 | /* Enumeration of possible PM states */ | |
| 28 | enum 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 | */ | |
| 41 | extern 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 | */ | |
| 51 | extern int cps_pm_enter_state(enum cps_pm_state state); | |
| 52 | ||
| 53 | #endif /* __MIPS_ASM_PM_CPS_H__ */ |