arch/arc/lib/timer.c

   1 /*
   2  * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <asm/arcregs.h>
   8
   9 #define NH_MODE (1 << 1)        /* Disable timer if CPU is halted */
  10
  11 int timer_init(void)
  12 {
  13         write_aux_reg(ARC_AUX_TIMER0_CTRL, NH_MODE);
  14         /* Set max value for counter/timer */
  15         write_aux_reg(ARC_AUX_TIMER0_LIMIT, 0xffffffff);
  16         /* Set initial count value and restart counter/timer */
  17         write_aux_reg(ARC_AUX_TIMER0_CNT, 0);
  18         return 0;
  19 }
  20
  21 unsigned long timer_read_counter(void)
  22 {
  23         return read_aux_reg(ARC_AUX_TIMER0_CNT);
  24 }