| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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 VPEs within each core are coupled and can only |
| 17 | * enter or exit states requiring CM or CPC assistance in unison. |
| 18 | */ |
| 19 | #ifdef CONFIG_MIPS_MT |
| 20 | # define coupled_coherence cpu_has_mipsmt |
| 21 | #else |
| 22 | # define coupled_coherence 0 |
| 23 | #endif |
| 24 | |
| 25 | /* Enumeration of possible PM states */ |
| 26 | enum cps_pm_state { |
| 27 | CPS_PM_NC_WAIT, /* MIPS wait instruction, non-coherent */ |
| 28 | CPS_PM_CLOCK_GATED, /* Core clock gated */ |
| 29 | CPS_PM_POWER_GATED, /* Core power gated */ |
| 30 | CPS_PM_STATE_COUNT, |
| 31 | }; |
| 32 | |
| 33 | /** |
| 34 | * cps_pm_support_state - determine whether the system supports a PM state |
| 35 | * @state: the state to test for support |
| 36 | * |
| 37 | * Returns true if the system supports the given state, otherwise false. |
| 38 | */ |
| 39 | extern bool cps_pm_support_state(enum cps_pm_state state); |
| 40 | |
| 41 | /** |
| 42 | * cps_pm_enter_state - enter a PM state |
| 43 | * @state: the state to enter |
| 44 | * |
| 45 | * Enter the given PM state. If coupled_coherence is non-zero then it is |
| 46 | * expected that this function be called at approximately the same time on |
| 47 | * each coupled CPU. Returns 0 on successful entry & exit, otherwise -errno. |
| 48 | */ |
| 49 | extern int cps_pm_enter_state(enum cps_pm_state state); |
| 50 | |
| 51 | #endif /* __MIPS_ASM_PM_CPS_H__ */ |