xref: /openbmc/linux/arch/arm/include/asm/bL_switcher.h (revision d2912cb1)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * arch/arm/include/asm/bL_switcher.h
4  *
5  * Created by:  Nicolas Pitre, April 2012
6  * Copyright:   (C) 2012-2013  Linaro Limited
7  */
8 
9 #ifndef ASM_BL_SWITCHER_H
10 #define ASM_BL_SWITCHER_H
11 
12 #include <linux/compiler.h>
13 #include <linux/types.h>
14 
15 typedef void (*bL_switch_completion_handler)(void *cookie);
16 
17 int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
18 			 bL_switch_completion_handler completer,
19 			 void *completer_cookie);
bL_switch_request(unsigned int cpu,unsigned int new_cluster_id)20 static inline int bL_switch_request(unsigned int cpu, unsigned int new_cluster_id)
21 {
22 	return bL_switch_request_cb(cpu, new_cluster_id, NULL, NULL);
23 }
24 
25 /*
26  * Register here to be notified about runtime enabling/disabling of
27  * the switcher.
28  *
29  * The notifier chain is called with the switcher activation lock held:
30  * the switcher will not be enabled or disabled during callbacks.
31  * Callbacks must not call bL_switcher_{get,put}_enabled().
32  */
33 #define BL_NOTIFY_PRE_ENABLE	0
34 #define BL_NOTIFY_POST_ENABLE	1
35 #define BL_NOTIFY_PRE_DISABLE	2
36 #define BL_NOTIFY_POST_DISABLE	3
37 
38 #ifdef CONFIG_BL_SWITCHER
39 
40 int bL_switcher_register_notifier(struct notifier_block *nb);
41 int bL_switcher_unregister_notifier(struct notifier_block *nb);
42 
43 /*
44  * Use these functions to temporarily prevent enabling/disabling of
45  * the switcher.
46  * bL_switcher_get_enabled() returns true if the switcher is currently
47  * enabled.  Each call to bL_switcher_get_enabled() must be followed
48  * by a call to bL_switcher_put_enabled().  These functions are not
49  * recursive.
50  */
51 bool bL_switcher_get_enabled(void);
52 void bL_switcher_put_enabled(void);
53 
54 int bL_switcher_trace_trigger(void);
55 int bL_switcher_get_logical_index(u32 mpidr);
56 
57 #else
bL_switcher_register_notifier(struct notifier_block * nb)58 static inline int bL_switcher_register_notifier(struct notifier_block *nb)
59 {
60 	return 0;
61 }
62 
bL_switcher_unregister_notifier(struct notifier_block * nb)63 static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
64 {
65 	return 0;
66 }
67 
bL_switcher_get_enabled(void)68 static inline bool bL_switcher_get_enabled(void) { return false; }
bL_switcher_put_enabled(void)69 static inline void bL_switcher_put_enabled(void) { }
bL_switcher_trace_trigger(void)70 static inline int bL_switcher_trace_trigger(void) { return 0; }
bL_switcher_get_logical_index(u32 mpidr)71 static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; }
72 #endif /* CONFIG_BL_SWITCHER */
73 
74 #endif
75