| 1 | #ifndef _LINUX_DELAY_H
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| 2 | #define _LINUX_DELAY_H
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| 3 |
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| 4 | |
| 5 | * Copyright (C) 1993 Linus Torvalds
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| 6 | *
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| 7 | * Delay routines, using a pre-computed "loops_per_jiffy" value.
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| 8 |
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| 9 |
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| 10 | #include <linux/kernel.h>
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| 11 |
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| 12 | extern unsigned long loops_per_jiffy;
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| 13 |
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| 14 | #include <asm/delay.h>
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| 15 |
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| 16 | |
| 17 | * Using udelay() for intervals greater than a few milliseconds can
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| 18 | * risk overflow for high loops_per_jiffy (high bogomips) machines. The
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| 19 | * mdelay() provides a wrapper to prevent this. For delays greater
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| 20 | * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture
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| 21 | * specific values can be defined in asm-???/delay.h as an override.
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| 22 | * The 2nd mdelay() definition ensures GCC will optimize away the
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| 23 | * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G.
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| 24 |
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| 25 |
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| 26 | #ifndef MAX_UDELAY_MS
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| 27 | #define MAX_UDELAY_MS 5
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| 28 | #endif
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| 29 |
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| 30 | #ifndef mdelay
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| 31 | #define mdelay(n) (\
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| 32 | (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
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| 33 | ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
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| 34 | #endif
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| 35 |
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| 36 | #ifndef ndelay
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| 37 | static inline void ndelay(unsigned long x)
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| 38 | {
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| 39 | udelay(DIV_ROUND_UP(x, 1000));
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| 40 | }
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| 41 | #define ndelay(x) ndelay(x)
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| 42 | #endif
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| 43 |
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| 44 | extern unsigned long lpj_fine;
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| 45 | void calibrate_delay(void);
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| 46 | void msleep(unsigned int msecs);
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| 47 | unsigned long msleep_interruptible(unsigned int msecs);
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| 48 | void usleep_range(unsigned long min, unsigned long max);
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| 49 |
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| 50 | static inline void ssleep(unsigned int seconds)
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| 51 | {
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| 52 | msleep(seconds * 1000);
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| 53 | }
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| 54 |
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| 55 | #endif
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