This source file includes following definitions.
- xloops_to_cycles
- __delay
- __const_udelay
- __udelay
- __ndelay
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10 #include <linux/delay.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/timex.h>
15
16 #include <clocksource/arm_arch_timer.h>
17
18 #define USECS_TO_CYCLES(time_usecs) \
19 xloops_to_cycles((time_usecs) * 0x10C7UL)
20
21 static inline unsigned long xloops_to_cycles(unsigned long xloops)
22 {
23 return (xloops * loops_per_jiffy * HZ) >> 32;
24 }
25
26 void __delay(unsigned long cycles)
27 {
28 cycles_t start = get_cycles();
29
30 if (arch_timer_evtstrm_available()) {
31 const cycles_t timer_evt_period =
32 USECS_TO_CYCLES(ARCH_TIMER_EVT_STREAM_PERIOD_US);
33
34 while ((get_cycles() - start + timer_evt_period) < cycles)
35 wfe();
36 }
37
38 while ((get_cycles() - start) < cycles)
39 cpu_relax();
40 }
41 EXPORT_SYMBOL(__delay);
42
43 inline void __const_udelay(unsigned long xloops)
44 {
45 __delay(xloops_to_cycles(xloops));
46 }
47 EXPORT_SYMBOL(__const_udelay);
48
49 void __udelay(unsigned long usecs)
50 {
51 __const_udelay(usecs * 0x10C7UL);
52 }
53 EXPORT_SYMBOL(__udelay);
54
55 void __ndelay(unsigned long nsecs)
56 {
57 __const_udelay(nsecs * 0x5UL);
58 }
59 EXPORT_SYMBOL(__ndelay);