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); 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 61 static inline int bL_switcher_register_notifier(struct notifier_block *nb) 62 { 63 return 0; 64 } 65 66 static inline int bL_switcher_unregister_notifier(struct notifier_block *nb) 67 { 68 return 0; 69 } 70 71 static inline bool bL_switcher_get_enabled(void) { return false; } 72 static inline void bL_switcher_put_enabled(void) { } 73 static inline int bL_switcher_trace_trigger(void) { return 0; } 74 static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; } 75 #endif /* CONFIG_BL_SWITCHER */ 76 77 #endif 78