| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 */ |