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a7b81769 MY |
1 | /* |
2 | * SPDX-License-Identifier: GPL-2.0+ | |
3 | */ | |
4 | ||
5 | #ifndef _TIME_H | |
6 | #define _TIME_H | |
7 | ||
21cdd133 MY |
8 | #include <linux/typecheck.h> |
9 | ||
a7b81769 MY |
10 | unsigned long get_timer(unsigned long base); |
11 | ||
12 | /* | |
13 | * Return the current value of a monotonically increasing microsecond timer. | |
14 | * Granularity may be larger than 1us if hardware does not support this. | |
15 | */ | |
16 | unsigned long timer_get_us(void); | |
17 | ||
21cdd133 MY |
18 | /* |
19 | * These inlines deal with timer wrapping correctly. You are | |
20 | * strongly encouraged to use them | |
21 | * 1. Because people otherwise forget | |
22 | * 2. Because if the timer wrap changes in future you won't have to | |
23 | * alter your driver code. | |
24 | * | |
25 | * time_after(a,b) returns true if the time a is after time b. | |
26 | * | |
27 | * Do this with "<0" and ">=0" to only test the sign of the result. A | |
28 | * good compiler would generate better code (and a really good compiler | |
29 | * wouldn't care). Gcc is currently neither. | |
30 | */ | |
31 | #define time_after(a,b) \ | |
32 | (typecheck(unsigned long, a) && \ | |
33 | typecheck(unsigned long, b) && \ | |
34 | ((long)((b) - (a)) < 0)) | |
35 | #define time_before(a,b) time_after(b,a) | |
36 | ||
37 | #define time_after_eq(a,b) \ | |
38 | (typecheck(unsigned long, a) && \ | |
39 | typecheck(unsigned long, b) && \ | |
40 | ((long)((a) - (b)) >= 0)) | |
41 | #define time_before_eq(a,b) time_after_eq(b,a) | |
42 | ||
43 | /* | |
44 | * Calculate whether a is in the range of [b, c]. | |
45 | */ | |
46 | #define time_in_range(a,b,c) \ | |
47 | (time_after_eq(a,b) && \ | |
48 | time_before_eq(a,c)) | |
49 | ||
50 | /* | |
51 | * Calculate whether a is in the range of [b, c). | |
52 | */ | |
53 | #define time_in_range_open(a,b,c) \ | |
54 | (time_after_eq(a,b) && \ | |
55 | time_before(a,c)) | |
56 | ||
a7b81769 | 57 | #endif /* _TIME_H */ |