arch/arm/include/asm/bL_switcher.h

   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