include/linux/pm_opp.h

   1 /*
   2  * Generic OPP Interface
   3  *
   4  * Copyright (C) 2009-2010 Texas Instruments Incorporated.
   5  *      Nishanth Menon
   6  *      Romit Dasgupta
   7  *      Kevin Hilman
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #ifndef __LINUX_OPP_H__
  15 #define __LINUX_OPP_H__
  16
  17 #include <linux/err.h>
  18 #include <linux/notifier.h>
  19
  20 struct dev_pm_opp;
  21 struct device;
  22
  23 enum dev_pm_opp_event {
  24         OPP_EVENT_ADD, OPP_EVENT_REMOVE, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
  25 };
  26
  27 #if defined(CONFIG_PM_OPP)
  28
  29 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp);
  30
  31 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
  32
  33 bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp);
  34
  35 int dev_pm_opp_get_opp_count(struct device *dev);
  36 unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev);
  37 struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev);
  38
  39 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  40                                               unsigned long freq,
  41                                               bool available);
  42
  43 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  44                                               unsigned long *freq);
  45
  46 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
  47                                              unsigned long *freq);
  48
  49 int dev_pm_opp_add(struct device *dev, unsigned long freq,
  50                    unsigned long u_volt);
  51 void dev_pm_opp_remove(struct device *dev, unsigned long freq);
  52
  53 int dev_pm_opp_enable(struct device *dev, unsigned long freq);
  54
  55 int dev_pm_opp_disable(struct device *dev, unsigned long freq);
  56
  57 struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev);
  58 #else
  59 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp)
  60 {
  61         return 0;
  62 }
  63
  64 static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
  65 {
  66         return 0;
  67 }
  68
  69 static inline bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp)
  70 {
  71         return false;
  72 }
  73
  74 static inline int dev_pm_opp_get_opp_count(struct device *dev)
  75 {
  76         return 0;
  77 }
  78
  79 static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev)
  80 {
  81         return 0;
  82 }
  83
  84 static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev)
  85 {
  86         return NULL;
  87 }
  88
  89 static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
  90                                         unsigned long freq, bool available)
  91 {
  92         return ERR_PTR(-EINVAL);
  93 }
  94
  95 static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
  96                                         unsigned long *freq)
  97 {
  98         return ERR_PTR(-EINVAL);
  99 }
 100
 101 static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev,
 102                                         unsigned long *freq)
 103 {
 104         return ERR_PTR(-EINVAL);
 105 }
 106
 107 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq,
 108                                         unsigned long u_volt)
 109 {
 110         return -EINVAL;
 111 }
 112
 113 static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq)
 114 {
 115 }
 116
 117 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq)
 118 {
 119         return 0;
 120 }
 121
 122 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq)
 123 {
 124         return 0;
 125 }
 126
 127 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier(
 128                                                         struct device *dev)
 129 {
 130         return ERR_PTR(-EINVAL);
 131 }
 132 #endif          /* CONFIG_PM_OPP */
 133
 134 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF)
 135 int of_init_opp_table(struct device *dev);
 136 void of_free_opp_table(struct device *dev);
 137 int of_cpumask_init_opp_table(cpumask_var_t cpumask);
 138 void of_cpumask_free_opp_table(cpumask_var_t cpumask);
 139 int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask);
 140 int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask);
 141 #else
 142 static inline int of_init_opp_table(struct device *dev)
 143 {
 144         return -EINVAL;
 145 }
 146
 147 static inline void of_free_opp_table(struct device *dev)
 148 {
 149 }
 150
 151 static inline int of_cpumask_init_opp_table(cpumask_var_t cpumask)
 152 {
 153         return -ENOSYS;
 154 }
 155
 156 static inline void of_cpumask_free_opp_table(cpumask_var_t cpumask)
 157 {
 158 }
 159
 160 static inline int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
 161 {
 162         return -ENOSYS;
 163 }
 164
 165 static inline int set_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)
 166 {
 167         return -ENOSYS;
 168 }
 169 #endif
 170
 171 #endif          /* __LINUX_OPP_H__ */