This source file includes following definitions.
- clocksource_freq2mult
- clocksource_khz2mult
- clocksource_hz2mult
- clocksource_cyc2ns
- __clocksource_register
- clocksource_register_hz
- clocksource_register_khz
- __clocksource_update_freq_hz
- __clocksource_update_freq_khz
- clocksource_arch_init
- timer_probe
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9 #ifndef _LINUX_CLOCKSOURCE_H
10 #define _LINUX_CLOCKSOURCE_H
11
12 #include <linux/types.h>
13 #include <linux/timex.h>
14 #include <linux/time.h>
15 #include <linux/list.h>
16 #include <linux/cache.h>
17 #include <linux/timer.h>
18 #include <linux/init.h>
19 #include <linux/of.h>
20 #include <asm/div64.h>
21 #include <asm/io.h>
22
23 struct clocksource;
24 struct module;
25
26 #ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
27 #include <asm/clocksource.h>
28 #endif
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80 struct clocksource {
81 u64 (*read)(struct clocksource *cs);
82 u64 mask;
83 u32 mult;
84 u32 shift;
85 u64 max_idle_ns;
86 u32 maxadj;
87 #ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
88 struct arch_clocksource_data archdata;
89 #endif
90 u64 max_cycles;
91 const char *name;
92 struct list_head list;
93 int rating;
94 int (*enable)(struct clocksource *cs);
95 void (*disable)(struct clocksource *cs);
96 unsigned long flags;
97 void (*suspend)(struct clocksource *cs);
98 void (*resume)(struct clocksource *cs);
99 void (*mark_unstable)(struct clocksource *cs);
100 void (*tick_stable)(struct clocksource *cs);
101
102
103 #ifdef CONFIG_CLOCKSOURCE_WATCHDOG
104
105 struct list_head wd_list;
106 u64 cs_last;
107 u64 wd_last;
108 #endif
109 struct module *owner;
110 };
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114
115 #define CLOCK_SOURCE_IS_CONTINUOUS 0x01
116 #define CLOCK_SOURCE_MUST_VERIFY 0x02
117
118 #define CLOCK_SOURCE_WATCHDOG 0x10
119 #define CLOCK_SOURCE_VALID_FOR_HRES 0x20
120 #define CLOCK_SOURCE_UNSTABLE 0x40
121 #define CLOCK_SOURCE_SUSPEND_NONSTOP 0x80
122 #define CLOCK_SOURCE_RESELECT 0x100
123
124
125 #define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
126
127 static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from)
128 {
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136 u64 tmp = ((u64)from) << shift_constant;
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138 tmp += freq/2;
139 do_div(tmp, freq);
140
141 return (u32)tmp;
142 }
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152 static inline u32 clocksource_khz2mult(u32 khz, u32 shift_constant)
153 {
154 return clocksource_freq2mult(khz, shift_constant, NSEC_PER_MSEC);
155 }
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166 static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
167 {
168 return clocksource_freq2mult(hz, shift_constant, NSEC_PER_SEC);
169 }
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184 static inline s64 clocksource_cyc2ns(u64 cycles, u32 mult, u32 shift)
185 {
186 return ((u64) cycles * mult) >> shift;
187 }
188
189
190 extern int clocksource_unregister(struct clocksource*);
191 extern void clocksource_touch_watchdog(void);
192 extern void clocksource_change_rating(struct clocksource *cs, int rating);
193 extern void clocksource_suspend(void);
194 extern void clocksource_resume(void);
195 extern struct clocksource * __init clocksource_default_clock(void);
196 extern void clocksource_mark_unstable(struct clocksource *cs);
197 extern void
198 clocksource_start_suspend_timing(struct clocksource *cs, u64 start_cycles);
199 extern u64 clocksource_stop_suspend_timing(struct clocksource *cs, u64 now);
200
201 extern u64
202 clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles);
203 extern void
204 clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);
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210 extern int
211 __clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq);
212 extern void
213 __clocksource_update_freq_scale(struct clocksource *cs, u32 scale, u32 freq);
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219 static inline int __clocksource_register(struct clocksource *cs)
220 {
221 return __clocksource_register_scale(cs, 1, 0);
222 }
223
224 static inline int clocksource_register_hz(struct clocksource *cs, u32 hz)
225 {
226 return __clocksource_register_scale(cs, 1, hz);
227 }
228
229 static inline int clocksource_register_khz(struct clocksource *cs, u32 khz)
230 {
231 return __clocksource_register_scale(cs, 1000, khz);
232 }
233
234 static inline void __clocksource_update_freq_hz(struct clocksource *cs, u32 hz)
235 {
236 __clocksource_update_freq_scale(cs, 1, hz);
237 }
238
239 static inline void __clocksource_update_freq_khz(struct clocksource *cs, u32 khz)
240 {
241 __clocksource_update_freq_scale(cs, 1000, khz);
242 }
243
244 #ifdef CONFIG_ARCH_CLOCKSOURCE_INIT
245 extern void clocksource_arch_init(struct clocksource *cs);
246 #else
247 static inline void clocksource_arch_init(struct clocksource *cs) { }
248 #endif
249
250 extern int timekeeping_notify(struct clocksource *clock);
251
252 extern u64 clocksource_mmio_readl_up(struct clocksource *);
253 extern u64 clocksource_mmio_readl_down(struct clocksource *);
254 extern u64 clocksource_mmio_readw_up(struct clocksource *);
255 extern u64 clocksource_mmio_readw_down(struct clocksource *);
256
257 extern int clocksource_mmio_init(void __iomem *, const char *,
258 unsigned long, int, unsigned, u64 (*)(struct clocksource *));
259
260 extern int clocksource_i8253_init(void);
261
262 #define TIMER_OF_DECLARE(name, compat, fn) \
263 OF_DECLARE_1_RET(timer, name, compat, fn)
264
265 #ifdef CONFIG_TIMER_PROBE
266 extern void timer_probe(void);
267 #else
268 static inline void timer_probe(void) {}
269 #endif
270
271 #define TIMER_ACPI_DECLARE(name, table_id, fn) \
272 ACPI_DECLARE_PROBE_ENTRY(timer, name, table_id, 0, NULL, 0, fn)
273
274 #endif