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 int dev_pm_opp_get_opp_count(struct device *dev); 34 35 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, 36 unsigned long freq, 37 bool available); 38 39 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, 40 unsigned long *freq); 41 42 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, 43 unsigned long *freq); 44 45 int dev_pm_opp_add(struct device *dev, unsigned long freq, 46 unsigned long u_volt); 47 void dev_pm_opp_remove(struct device *dev, unsigned long freq); 48 49 int dev_pm_opp_enable(struct device *dev, unsigned long freq); 50 51 int dev_pm_opp_disable(struct device *dev, unsigned long freq); 52 53 struct srcu_notifier_head *dev_pm_opp_get_notifier(struct device *dev); 54 #else 55 static inline unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) 56 { 57 return 0; 58 } 59 60 static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) 61 { 62 return 0; 63 } 64 65 static inline int dev_pm_opp_get_opp_count(struct device *dev) 66 { 67 return 0; 68 } 69 70 static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, 71 unsigned long freq, bool available) 72 { 73 return ERR_PTR(-EINVAL); 74 } 75 76 static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, 77 unsigned long *freq) 78 { 79 return ERR_PTR(-EINVAL); 80 } 81 82 static inline struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, 83 unsigned long *freq) 84 { 85 return ERR_PTR(-EINVAL); 86 } 87 88 static inline int dev_pm_opp_add(struct device *dev, unsigned long freq, 89 unsigned long u_volt) 90 { 91 return -EINVAL; 92 } 93 94 static inline void dev_pm_opp_remove(struct device *dev, unsigned long freq) 95 { 96 } 97 98 static inline int dev_pm_opp_enable(struct device *dev, unsigned long freq) 99 { 100 return 0; 101 } 102 103 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq) 104 { 105 return 0; 106 } 107 108 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier( 109 struct device *dev) 110 { 111 return ERR_PTR(-EINVAL); 112 } 113 #endif /* CONFIG_PM_OPP */ 114 115 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF) 116 int of_init_opp_table(struct device *dev); 117 void of_free_opp_table(struct device *dev); 118 #else 119 static inline int of_init_opp_table(struct device *dev) 120 { 121 return -EINVAL; 122 } 123 124 static inline void of_free_opp_table(struct device *dev) 125 { 126 } 127 #endif 128 129 #endif /* __LINUX_OPP_H__ */ 130