1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __ASM_GENERIC_DELAY_H |
3 | #define __ASM_GENERIC_DELAY_H |
4 | |
5 | /* Undefined functions to get compile-time errors */ |
6 | extern void __bad_udelay(void); |
7 | extern void __bad_ndelay(void); |
8 | |
9 | extern void __udelay(unsigned long usecs); |
10 | extern void __ndelay(unsigned long nsecs); |
11 | extern void __const_udelay(unsigned long xloops); |
12 | extern void __delay(unsigned long loops); |
13 | |
14 | /* |
15 | * The weird n/20000 thing suppresses a "comparison is always false due to |
16 | * limited range of data type" warning with non-const 8-bit arguments. |
17 | */ |
18 | |
19 | /* 0x10c7 is 2**32 / 1000000 (rounded up) */ |
20 | #define udelay(n) \ |
21 | ({ \ |
22 | if (__builtin_constant_p(n)) { \ |
23 | if ((n) / 20000 >= 1) \ |
24 | __bad_udelay(); \ |
25 | else \ |
26 | __const_udelay((n) * 0x10c7ul); \ |
27 | } else { \ |
28 | __udelay(n); \ |
29 | } \ |
30 | }) |
31 | |
32 | /* 0x5 is 2**32 / 1000000000 (rounded up) */ |
33 | #define ndelay(n) \ |
34 | ({ \ |
35 | if (__builtin_constant_p(n)) { \ |
36 | if ((n) / 20000 >= 1) \ |
37 | __bad_ndelay(); \ |
38 | else \ |
39 | __const_udelay((n) * 5ul); \ |
40 | } else { \ |
41 | __ndelay(n); \ |
42 | } \ |
43 | }) |
44 | |
45 | #endif /* __ASM_GENERIC_DELAY_H */ |
46 | |