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By: a guest on May 2nd, 2012  |  syntax: None  |  size: 0.34 KB  |  hits: 15  |  expires: Never
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  1. static inline void udelay(unsigned usecs)
  2. {
  3.     unsigned cycles_per_usec = (cpu_frequency == CPUFREQ_MAX) ?
  4.         (CPUFREQ_MAX / 1000000) : (CPUFREQ_NORMAL / 1000000);
  5.     unsigned cycles = usecs * cycles_per_usec / 4;
  6.  
  7.     asm volatile(
  8.         "1: subs %0, %0, #1 \n"
  9.         "   bne 1b          \n"
  10.         : : "r"(cycles)
  11.     );
  12.  
  13. }
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