LXR linux/arch/arm/include/asm/bL

   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
  18typedef void (*bL_switch_completion_handler)(void *cookie);
  19
  20int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
  21                         bL_switch_completion_handler completer,
  22                         void *completer_cookie);
  23static 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
  43int bL_switcher_register_notifier(struct notifier_block *nb);
  44int 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 */
  54bool bL_switcher_get_enabled(void);
  55void bL_switcher_put_enabled(void);
  56
  57int bL_switcher_trace_trigger(void);
  58int bL_switcher_get_logical_index(u32 mpidr);
  59
  60#else
  61static inline int bL_switcher_register_notifier(struct notifier_block *nb)
  62{
  63        return 0;
  64}
  65
  66static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
  67{
  68        return 0;
  69}
  70
  71static inline bool bL_switcher_get_enabled(void) { return false; }
  72static inline void bL_switcher_put_enabled(void) { }
  73static inline int bL_switcher_trace_trigger(void) { return 0; }
  74static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; }
  75#endif /* CONFIG_BL_SWITCHER */
  76
  77#endif
  78