arch/arm/cpu/armv8/generic_timer.c

   1 /*
   2  * (C) Copyright 2013
   3  * David Feng <fenghua@phytium.com.cn>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <command.h>
  10 #include <asm/system.h>
  11
  12 /*
  13  * Generic timer implementation of get_tbclk()
  14  */
  15 unsigned long get_tbclk(void)
  16 {
  17         unsigned long cntfrq;
  18         asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
  19         return cntfrq;
  20 }
  21
  22 /*
  23  * Generic timer implementation of timer_read_counter()
  24  */
  25 unsigned long timer_read_counter(void)
  26 {
  27         unsigned long cntpct;
  28         isb();
  29         asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
  30         return cntpct;
  31 }