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);
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
58 static inline int bL_switcher_register_notifier(struct notifier_block *nb)
59 {
60 return 0;
61 }
62
63 static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
64 {
65 return 0;
66 }
67
68 static inline bool bL_switcher_get_enabled(void) { return false; }
69 static inline void bL_switcher_put_enabled(void) { }
70 static inline int bL_switcher_trace_trigger(void) { return 0; }
71 static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; }
72 #endif /* CONFIG_BL_SWITCHER */
73
74 #endif
75
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.