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