13179d37eSPaul Burton /* 23179d37eSPaul Burton * Copyright (C) 2014 Imagination Technologies 33179d37eSPaul Burton * Author: Paul Burton <paul.burton@imgtec.com> 43179d37eSPaul Burton * 53179d37eSPaul Burton * This program is free software; you can redistribute it and/or modify it 63179d37eSPaul Burton * under the terms of the GNU General Public License as published by the 73179d37eSPaul Burton * Free Software Foundation; either version 2 of the License, or (at your 83179d37eSPaul Burton * option) any later version. 93179d37eSPaul Burton */ 103179d37eSPaul Burton 113179d37eSPaul Burton #ifndef __MIPS_ASM_PM_CPS_H__ 123179d37eSPaul Burton #define __MIPS_ASM_PM_CPS_H__ 133179d37eSPaul Burton 143179d37eSPaul Burton /* 153179d37eSPaul Burton * The CM & CPC can only handle coherence & power control on a per-core basis, 16*929d4f51SMatt Redfearn * thus in an MT system the VP(E)s within each core are coupled and can only 173179d37eSPaul Burton * enter or exit states requiring CM or CPC assistance in unison. 183179d37eSPaul Burton */ 19*929d4f51SMatt Redfearn #if defined(CONFIG_CPU_MIPSR6) 20*929d4f51SMatt Redfearn # define coupled_coherence cpu_has_vp 21*929d4f51SMatt Redfearn #elif defined(CONFIG_MIPS_MT) 223179d37eSPaul Burton # define coupled_coherence cpu_has_mipsmt 233179d37eSPaul Burton #else 243179d37eSPaul Burton # define coupled_coherence 0 253179d37eSPaul Burton #endif 263179d37eSPaul Burton 273179d37eSPaul Burton /* Enumeration of possible PM states */ 283179d37eSPaul Burton enum cps_pm_state { 293179d37eSPaul Burton CPS_PM_NC_WAIT, /* MIPS wait instruction, non-coherent */ 303179d37eSPaul Burton CPS_PM_CLOCK_GATED, /* Core clock gated */ 313179d37eSPaul Burton CPS_PM_POWER_GATED, /* Core power gated */ 323179d37eSPaul Burton CPS_PM_STATE_COUNT, 333179d37eSPaul Burton }; 343179d37eSPaul Burton 353179d37eSPaul Burton /** 363179d37eSPaul Burton * cps_pm_support_state - determine whether the system supports a PM state 373179d37eSPaul Burton * @state: the state to test for support 383179d37eSPaul Burton * 393179d37eSPaul Burton * Returns true if the system supports the given state, otherwise false. 403179d37eSPaul Burton */ 413179d37eSPaul Burton extern bool cps_pm_support_state(enum cps_pm_state state); 423179d37eSPaul Burton 433179d37eSPaul Burton /** 443179d37eSPaul Burton * cps_pm_enter_state - enter a PM state 453179d37eSPaul Burton * @state: the state to enter 463179d37eSPaul Burton * 473179d37eSPaul Burton * Enter the given PM state. If coupled_coherence is non-zero then it is 483179d37eSPaul Burton * expected that this function be called at approximately the same time on 493179d37eSPaul Burton * each coupled CPU. Returns 0 on successful entry & exit, otherwise -errno. 503179d37eSPaul Burton */ 513179d37eSPaul Burton extern int cps_pm_enter_state(enum cps_pm_state state); 523179d37eSPaul Burton 533179d37eSPaul Burton #endif /* __MIPS_ASM_PM_CPS_H__ */ 54