388 	u32 prescale;  in mpc52xx_gpt_do_start()  local
417 	 * Note: the prescale register is '1' based, not '0' based.  ie. a  in mpc52xx_gpt_do_start()
420 	 * around and divides by 0x10000.  That is why prescale must be  in mpc52xx_gpt_do_start()
422 	prescale = (clocks >> 16) + 1;  in mpc52xx_gpt_do_start()
423 	do_div(clocks, prescale);  in mpc52xx_gpt_do_start()
425 		pr_err("calculation error; prescale:%x clocks:%llx\n",  in mpc52xx_gpt_do_start()
426 		       prescale, clocks);  in mpc52xx_gpt_do_start()
438 	out_be32(&gpt->regs->count, prescale << 16 | clocks);  in mpc52xx_gpt_do_start()
492 	u64 prescale;  in mpc52xx_gpt_timer_period()  local
499 	prescale = period >> 16;  in mpc52xx_gpt_timer_period()
501 	if (prescale == 0)  in mpc52xx_gpt_timer_period()
502 		prescale = 0x10000;  in mpc52xx_gpt_timer_period()
503 	period = period * prescale * 1000000000ULL;  in mpc52xx_gpt_timer_period()