~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/h8300/include/asm/delay.h

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #ifndef _H8300_DELAY_H
  2 #define _H8300_DELAY_H
  3 
  4 #include <asm/param.h>
  5 
  6 /*
  7  * Copyright (C) 2002 Yoshinori Sato <ysato@sourceforge.jp>
  8  *
  9  * Delay routines, using a pre-computed "loops_per_second" value.
 10  */
 11 
 12 static inline void __delay(unsigned long loops)
 13 {
 14         __asm__ __volatile__ ("1:\n\t"
 15                               "dec.l #1,%0\n\t"
 16                               "bne 1b"
 17                               :"=r" (loops):""(loops));
 18 }
 19 
 20 /*
 21  * Use only for very small delays ( < 1 msec).  Should probably use a
 22  * lookup table, really, as the multiplications take much too long with
 23  * short delays.  This is a "reasonable" implementation, though (and the
 24  * first constant multiplications gets optimized away if the delay is
 25  * a constant)  
 26  */
 27 
 28 extern unsigned long loops_per_jiffy;
 29 
 30 static inline void udelay(unsigned long usecs)
 31 {
 32         usecs *= 4295;          /* 2**32 / 1000000 */
 33         usecs /= (loops_per_jiffy*HZ);
 34         if (usecs)
 35                 __delay(usecs);
 36 }
 37 
 38 #endif /* _H8300_DELAY_H */
 39 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp