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

TOMOYO Linux Cross Reference
Linux/arch/openrisc/lib/delay.c

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ 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-3.16.85 ] ~ [ 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-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 /*
  2  * OpenRISC Linux
  3  *
  4  * Linux architectural port borrowing liberally from similar works of
  5  * others.  All original copyrights apply as per the original source
  6  * declaration.
  7  *
  8  * Modifications for the OpenRISC architecture:
  9  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 10  *
 11  *      This program is free software; you can redistribute it and/or
 12  *      modify it under the terms of the GNU General Public License
 13  *      version 2 as published by the Free Software Foundation
 14  *
 15  * Precise Delay Loops
 16  */
 17 
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <asm/delay.h>
 22 #include <asm/timex.h>
 23 #include <asm/processor.h>
 24 
 25 int read_current_timer(unsigned long *timer_value)
 26 {
 27         *timer_value = mfspr(SPR_TTCR);
 28         return 0;
 29 }
 30 
 31 void __delay(unsigned long cycles)
 32 {
 33         cycles_t start = get_cycles();
 34 
 35         while ((get_cycles() - start) < cycles)
 36                 cpu_relax();
 37 }
 38 EXPORT_SYMBOL(__delay);
 39 
 40 inline void __const_udelay(unsigned long xloops)
 41 {
 42         unsigned long long loops;
 43 
 44         loops = (unsigned long long)xloops * loops_per_jiffy * HZ;
 45 
 46         __delay(loops >> 32);
 47 }
 48 EXPORT_SYMBOL(__const_udelay);
 49 
 50 void __udelay(unsigned long usecs)
 51 {
 52         __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
 53 }
 54 EXPORT_SYMBOL(__udelay);
 55 
 56 void __ndelay(unsigned long nsecs)
 57 {
 58         __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
 59 }
 60 EXPORT_SYMBOL(__ndelay);
 61 

~ [ 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