2 * SPDX-License-Identifier: GPL-2.0+
8 #include <linux/typecheck.h>
10 unsigned long get_timer(unsigned long base);
13 * Return the current value of a monotonically increasing microsecond timer.
14 * Granularity may be larger than 1us if hardware does not support this.
16 unsigned long timer_get_us(void);
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.
25 * time_after(a,b) returns true if the time a is after time b.
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.
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)
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)
44 * Calculate whether a is in the range of [b, c].
46 #define time_in_range(a,b,c) \
47 (time_after_eq(a,b) && \
51 * Calculate whether a is in the range of [b, c).
53 #define time_in_range_open(a,b,c) \
54 (time_after_eq(a,b) && \