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Linux/arch/sh/lib/delay.c

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  1 /*
  2  *      Precise Delay Loops for SuperH
  3  *
  4  *      Copyright (C) 1999 Niibe Yutaka & Kaz Kojima
  5  */
  6 
  7 #include <linux/sched.h>
  8 #include <linux/delay.h>
  9 
 10 void __delay(unsigned long loops)
 11 {
 12         __asm__ __volatile__(
 13                 /*
 14                  * ST40-300 appears to have an issue with this code,
 15                  * normally taking two cycles each loop, as with all
 16                  * other SH variants. If however the branch and the
 17                  * delay slot straddle an 8 byte boundary, this increases
 18                  * to 3 cycles.
 19                  * This align directive ensures this doesn't occur.
 20                  */
 21                 ".balign 8\n\t"
 22 
 23                 "tst    %0, %0\n\t"
 24                 "1:\t"
 25                 "bf/s   1b\n\t"
 26                 " dt    %0"
 27                 : "=r" (loops)
 28                 : "" (loops)
 29                 : "t");
 30 }
 31 
 32 inline void __const_udelay(unsigned long xloops)
 33 {
 34         xloops *= 4;
 35         __asm__("dmulu.l        %0, %2\n\t"
 36                 "sts    mach, %0"
 37                 : "=r" (xloops)
 38                 : "" (xloops),
 39                   "r" (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (HZ/4))
 40                 : "macl", "mach");
 41         __delay(++xloops);
 42 }
 43 
 44 void __udelay(unsigned long usecs)
 45 {
 46         __const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
 47 }
 48 
 49 void __ndelay(unsigned long nsecs)
 50 {
 51         __const_udelay(nsecs * 0x00000005);
 52 }
 53 
 54 

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