| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_GENERIC_DELAY_H |
| #define __ASM_GENERIC_DELAY_H |
| |
| /* Undefined functions to get compile-time errors */ |
| extern void __bad_udelay(void); |
| extern void __bad_ndelay(void); |
| |
| extern void __udelay(unsigned long usecs); |
| extern void __ndelay(unsigned long nsecs); |
| extern void __const_udelay(unsigned long xloops); |
| extern void __delay(unsigned long loops); |
| |
| /* |
| * The weird n/20000 thing suppresses a "comparison is always false due to |
| * limited range of data type" warning with non-const 8-bit arguments. |
| */ |
| |
| /* 0x10c7 is 2**32 / 1000000 (rounded up) */ |
| #define udelay(n) \ |
| ({ \ |
| if (__builtin_constant_p(n)) { \ |
| if ((n) / 20000 >= 1) \ |
| __bad_udelay(); \ |
| else \ |
| __const_udelay((n) * 0x10c7ul); \ |
| } else { \ |
| __udelay(n); \ |
| } \ |
| }) |
| |
| /* 0x5 is 2**32 / 1000000000 (rounded up) */ |
| #define ndelay(n) \ |
| ({ \ |
| if (__builtin_constant_p(n)) { \ |
| if ((n) / 20000 >= 1) \ |
| __bad_ndelay(); \ |
| else \ |
| __const_udelay((n) * 5ul); \ |
| } else { \ |
| __ndelay(n); \ |
| } \ |
| }) |
| |
| #endif /* __ASM_GENERIC_DELAY_H */ |