arch/mips/include/asm/pm-cps.h

   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__ */