Eric Lee / smarc-fsl-linux-kernel

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include/asm-generic/delay.h 1.09 KB
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aafe4dbed   Arnd Bergmann   asm-generic: add ... 
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  #ifndef __ASM_GENERIC_DELAY_H
  #define __ASM_GENERIC_DELAY_H
30ab2b034   Jonas Bonn   asm-generic: adap... 
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  /* Undefined functions to get compile-time errors */
  extern void __bad_udelay(void);
  extern void __bad_ndelay(void);
aafe4dbed   Arnd Bergmann   asm-generic: add ... 
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  extern void __udelay(unsigned long usecs);
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  extern void __ndelay(unsigned long nsecs);
  extern void __const_udelay(unsigned long xloops);
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  extern void __delay(unsigned long loops);
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  /*
   * 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.
   */
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  /* 0x10c7 is 2**32 / 1000000 (rounded up) */
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  #define udelay(n)							\
  	({								\
  		if (__builtin_constant_p(n)) {				\
  			if ((n) / 20000 >= 1)				\
  				 __bad_udelay();			\
  			else						\
  				__const_udelay((n) * 0x10c7ul);		\
  		} else {						\
  			__udelay(n);					\
  		}							\
  	})
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  /* 0x5 is 2**32 / 1000000000 (rounded up) */
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  #define ndelay(n)							\
  	({								\
  		if (__builtin_constant_p(n)) {				\
  			if ((n) / 20000 >= 1)				\
  				__bad_ndelay();				\
  			else						\
  				__const_udelay((n) * 5ul);		\
  		} else {						\
  			__ndelay(n);					\
  		}							\
  	})
aafe4dbed   Arnd Bergmann   asm-generic: add ... 
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  #endif /* __ASM_GENERIC_DELAY_H */