1 /*
2 * arch/arm/include/asm/bL_switcher.h
3 *
4 * Created by: Nicolas Pitre, April 2012
5 * Copyright: (C) 2012-2013 Linaro Limited
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #ifndef ASM_BL_SWITCHER_H
13 #define ASM_BL_SWITCHER_H
14
15 #include <linux/compiler.h>
16 #include <linux/types.h>
17
18 typedef void (*bL_switch_completion_handler)(void *cookie);
19
20 int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
21 bL_switch_completion_handler completer,
22 void *completer_cookie);
bL_switch_request(unsigned int cpu,unsigned int new_cluster_id)23 static inline int bL_switch_request(unsigned int cpu, unsigned int new_cluster_id)
24 {
25 return bL_switch_request_cb(cpu, new_cluster_id, NULL, NULL);
26 }
27
28 /*
29 * Register here to be notified about runtime enabling/disabling of
30 * the switcher.
31 *
32 * The notifier chain is called with the switcher activation lock held:
33 * the switcher will not be enabled or disabled during callbacks.
34 * Callbacks must not call bL_switcher_{get,put}_enabled().
35 */
36 #define BL_NOTIFY_PRE_ENABLE 0
37 #define BL_NOTIFY_POST_ENABLE 1
38 #define BL_NOTIFY_PRE_DISABLE 2
39 #define BL_NOTIFY_POST_DISABLE 3
40
41 #ifdef CONFIG_BL_SWITCHER
42
43 int bL_switcher_register_notifier(struct notifier_block *nb);
44 int bL_switcher_unregister_notifier(struct notifier_block *nb);
45
46 /*
47 * Use these functions to temporarily prevent enabling/disabling of
48 * the switcher.
49 * bL_switcher_get_enabled() returns true if the switcher is currently
50 * enabled. Each call to bL_switcher_get_enabled() must be followed
51 * by a call to bL_switcher_put_enabled(). These functions are not
52 * recursive.
53 */
54 bool bL_switcher_get_enabled(void);
55 void bL_switcher_put_enabled(void);
56
57 int bL_switcher_trace_trigger(void);
58 int bL_switcher_get_logical_index(u32 mpidr);
59
60 #else
bL_switcher_register_notifier(struct notifier_block * nb)61 static inline int bL_switcher_register_notifier(struct notifier_block *nb)
62 {
63 return 0;
64 }
65
bL_switcher_unregister_notifier(struct notifier_block * nb)66 static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
67 {
68 return 0;
69 }
70
bL_switcher_get_enabled(void)71 static inline bool bL_switcher_get_enabled(void) { return false; }
bL_switcher_put_enabled(void)72 static inline void bL_switcher_put_enabled(void) { }
bL_switcher_trace_trigger(void)73 static inline int bL_switcher_trace_trigger(void) { return 0; }
bL_switcher_get_logical_index(u32 mpidr)74 static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; }
75 #endif /* CONFIG_BL_SWITCHER */
76
77 #endif
78