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 opp;
22 struct device;
23
24 enum opp_event {
25 OPP_EVENT_ADD, OPP_EVENT_ENABLE, OPP_EVENT_DISABLE,
26 };
27
28 #if defined(CONFIG_PM_OPP)
29
30 unsigned long opp_get_voltage(struct opp *opp);
31
32 unsigned long opp_get_freq(struct opp *opp);
33
34 int opp_get_opp_count(struct device *dev);
35
36 struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
37 bool available);
38
39 struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq);
40
41 struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq);
42
43 int opp_add(struct device *dev, unsigned long freq, unsigned long u_volt);
44
45 int opp_enable(struct device *dev, unsigned long freq);
46
47 int opp_disable(struct device *dev, unsigned long freq);
48
49 struct srcu_notifier_head *opp_get_notifier(struct device *dev);
50
51 #else
opp_get_voltage(struct opp * opp)52 static inline unsigned long opp_get_voltage(struct opp *opp)
53 {
54 return 0;
55 }
56
opp_get_freq(struct opp * opp)57 static inline unsigned long opp_get_freq(struct opp *opp)
58 {
59 return 0;
60 }
61
opp_get_opp_count(struct device * dev)62 static inline int opp_get_opp_count(struct device *dev)
63 {
64 return 0;
65 }
66
opp_find_freq_exact(struct device * dev,unsigned long freq,bool available)67 static inline struct opp *opp_find_freq_exact(struct device *dev,
68 unsigned long freq, bool available)
69 {
70 return ERR_PTR(-EINVAL);
71 }
72
opp_find_freq_floor(struct device * dev,unsigned long * freq)73 static inline struct opp *opp_find_freq_floor(struct device *dev,
74 unsigned long *freq)
75 {
76 return ERR_PTR(-EINVAL);
77 }
78
opp_find_freq_ceil(struct device * dev,unsigned long * freq)79 static inline struct opp *opp_find_freq_ceil(struct device *dev,
80 unsigned long *freq)
81 {
82 return ERR_PTR(-EINVAL);
83 }
84
opp_add(struct device * dev,unsigned long freq,unsigned long u_volt)85 static inline int opp_add(struct device *dev, unsigned long freq,
86 unsigned long u_volt)
87 {
88 return -EINVAL;
89 }
90
opp_enable(struct device * dev,unsigned long freq)91 static inline int opp_enable(struct device *dev, unsigned long freq)
92 {
93 return 0;
94 }
95
opp_disable(struct device * dev,unsigned long freq)96 static inline int opp_disable(struct device *dev, unsigned long freq)
97 {
98 return 0;
99 }
100
opp_get_notifier(struct device * dev)101 static inline struct srcu_notifier_head *opp_get_notifier(struct device *dev)
102 {
103 return ERR_PTR(-EINVAL);
104 }
105 #endif /* CONFIG_PM_OPP */
106
107 #if defined(CONFIG_CPU_FREQ) && defined(CONFIG_PM_OPP)
108 int opp_init_cpufreq_table(struct device *dev,
109 struct cpufreq_frequency_table **table);
110 void opp_free_cpufreq_table(struct device *dev,
111 struct cpufreq_frequency_table **table);
112 #else
opp_init_cpufreq_table(struct device * dev,struct cpufreq_frequency_table ** table)113 static inline int opp_init_cpufreq_table(struct device *dev,
114 struct cpufreq_frequency_table **table)
115 {
116 return -EINVAL;
117 }
118
119 static inline
opp_free_cpufreq_table(struct device * dev,struct cpufreq_frequency_table ** table)120 void opp_free_cpufreq_table(struct device *dev,
121 struct cpufreq_frequency_table **table)
122 {
123 }
124 #endif /* CONFIG_CPU_FREQ */
125
126 #endif /* __LINUX_OPP_H__ */
127