1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License version 2 as
4  * published by the Free Software Foundation.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
9  * GNU General Public License for more details.
10  *
11  * Copyright (C) 2015 ARM Limited
12  */
13 
14 #ifndef __LINUX_PSCI_H
15 #define __LINUX_PSCI_H
16 
17 #include <linux/init.h>
18 #include <linux/types.h>
19 
20 #define PSCI_POWER_STATE_TYPE_STANDBY		0
21 #define PSCI_POWER_STATE_TYPE_POWER_DOWN	1
22 
23 bool psci_tos_resident_on(int cpu);
24 
25 int psci_cpu_init_idle(unsigned int cpu);
26 int psci_cpu_suspend_enter(unsigned long index);
27 
28 enum psci_conduit {
29 	PSCI_CONDUIT_NONE,
30 	PSCI_CONDUIT_SMC,
31 	PSCI_CONDUIT_HVC,
32 };
33 
34 enum smccc_version {
35 	SMCCC_VERSION_1_0,
36 	SMCCC_VERSION_1_1,
37 };
38 
39 struct psci_operations {
40 	u32 (*get_version)(void);
41 	int (*cpu_suspend)(u32 state, unsigned long entry_point);
42 	int (*cpu_off)(u32 state);
43 	int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
44 	int (*migrate)(unsigned long cpuid);
45 	int (*affinity_info)(unsigned long target_affinity,
46 			unsigned long lowest_affinity_level);
47 	int (*migrate_info_type)(void);
48 	enum psci_conduit conduit;
49 	enum smccc_version smccc_version;
50 };
51 
52 extern struct psci_operations psci_ops;
53 
54 #if defined(CONFIG_ARM_PSCI_FW)
55 int __init psci_dt_init(void);
56 #else
psci_dt_init(void)57 static inline int psci_dt_init(void) { return 0; }
58 #endif
59 
60 #if defined(CONFIG_ARM_PSCI_FW) && defined(CONFIG_ACPI)
61 int __init psci_acpi_init(void);
62 bool __init acpi_psci_present(void);
63 bool acpi_psci_use_hvc(void);
64 #else
psci_acpi_init(void)65 static inline int psci_acpi_init(void) { return 0; }
acpi_psci_present(void)66 static inline bool acpi_psci_present(void) { return false; }
acpi_psci_use_hvc(void)67 static inline bool acpi_psci_use_hvc(void) {return false; }
68 #endif
69 
70 #endif /* __LINUX_PSCI_H */
71