arch/arm/include/asm/bL_switcher.h

   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