#include <stdio.h>

#define MILLION 1000000
#define HZ 1000


unsigned long tsc_freq = 1500000000UL;
unsigned long cyclone_freq = 100000000UL;
unsigned long tsc_lpj = 1500000000UL/HZ;
unsigned long cyclone_lpj = 100000000UL/HZ;
unsigned long LPJ;

unsigned long  __delay(unsigned long loops)
{
	return loops;
}

unsigned long  __const_udelay(unsigned long xloops)
{
	int d0;
	__asm__("mull %0"
		:"=d" (xloops), "=&a" (d0)
		:"1" (xloops),"0" (LPJ));
        return __delay(xloops * HZ);
}

unsigned long  my_udelay(unsigned long usec)
{
	unsigned long cyc_per_usec = (LPJ*HZ)/MILLION;
	return __delay(usec*cyc_per_usec);
}


unsigned long __udelay(unsigned long usecs)
{
	return __const_udelay(usecs * 0x000010c6);  /* 2**32 / 1000000 */
}

unsigned long __ndelay(unsigned long nsecs)
{
	return __const_udelay(nsecs * 0x00005);  /* 2**32 / 1000000000 (rounded up) */
}


int main(void)
{
	unsigned long time[7] = {1,2,5,10,20,50,100};
	int i;
	
	for(i=0;i < 7; i++){
		LPJ=cyclone_lpj;
		printf("%3i usec: LPJ: %7lu __udelay: %5lu vs my_udelay: %5lu\n", 
					time[i], LPJ, __udelay(time[i]), my_udelay(time[i]));
		LPJ=tsc_lpj;
		printf("%3i usec: LPJ: %lu __udelay: %5lu vs my_udelay: %5lu\n", 
					time[i], LPJ, __udelay(time[i]), my_udelay(time[i]));
		printf("\n");
	}

	return 0;
}