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/cpufreq.h> 19 #include <linux/notifier.h> 20 21 struct dev_pm_opp; 22 struct device; 23 24 enum dev_pm_opp_event { 25 OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE, 26 }; 27 28 #if defined(CONFIG_PM_OPP) 29 30 unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp); 31 32 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp); 33 34 int dev_pm_opp_get_opp_count(struct device *dev); 35 36 struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, 37 unsigned long freq, 38 bool available); 39 40 struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, 41 unsigned long *freq); 42 43 struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, 44 unsigned long *freq); 45 46 int dev_pm_opp_add(struct device *dev, unsigned long freq, 47 unsigned long u_volt); 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 int dev_pm_opp_enable(struct device *dev, unsigned long freq) 95 { 96 return 0; 97 } 98 99 static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq) 100 { 101 return 0; 102 } 103 104 static inline struct srcu_notifier_head *dev_pm_opp_get_notifier( 105 struct device *dev) 106 { 107 return ERR_PTR(-EINVAL); 108 } 109 #endif /* CONFIG_PM_OPP */ 110 111 #if defined(CONFIG_PM_OPP) && defined(CONFIG_OF) 112 int of_init_opp_table(struct device *dev); 113 #else 114 static inline int of_init_opp_table(struct device *dev) 115 { 116 return -EINVAL; 117 } 118 #endif 119 120 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP) 121 int dev_pm_opp_init_cpufreq_table(struct device *dev, 122 struct cpufreq_frequency_table **table); 123 void dev_pm_opp_free_cpufreq_table(struct device *dev, 124 struct cpufreq_frequency_table **table); 125 #else 126 static inline int dev_pm_opp_init_cpufreq_table(struct device *dev, 127 struct cpufreq_frequency_table **table) 128 { 129 return -EINVAL; 130 } 131 132 static inline 133 void dev_pm_opp_free_cpufreq_table(struct device *dev, 134 struct cpufreq_frequency_table **table) 135 { 136 } 137 #endif /* CONFIG_CPU_FREQ */ 138 139 #endif /* __LINUX_OPP_H__ */ 140