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Diffstat (limited to 'arch/mips/include/asm/pm-cps.h')
| -rw-r--r-- | arch/mips/include/asm/pm-cps.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/mips/include/asm/pm-cps.h b/arch/mips/include/asm/pm-cps.h new file mode 100644 index 000000000..bb0616967 --- /dev/null +++ b/arch/mips/include/asm/pm-cps.h @@ -0,0 +1,53 @@ +/* + * Copyright (C) 2014 Imagination Technologies + * Author: Paul Burton <paul.burton@mips.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 VP(E)s within each core are coupled and can only + * enter or exit states requiring CM or CPC assistance in unison. + */ +#if defined(CONFIG_CPU_MIPSR6) +# define coupled_coherence cpu_has_vp +#elif defined(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__ */ |