arch/arm/cpu/arm1176/bcm2835/timer.c

   1 /*
   2  * (C) Copyright 2012 Stephen Warren
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <common.h>
  18 #include <asm/io.h>
  19 #include <asm/arch/timer.h>
  20
  21 int timer_init(void)
  22 {
  23         return 0;
  24 }
  25
  26 ulong get_timer(ulong base)
  27 {
  28         struct bcm2835_timer_regs *regs =
  29                 (struct bcm2835_timer_regs *)BCM2835_TIMER_PHYSADDR;
  30
  31         return readl(&regs->clo) - base;
  32 }
  33
  34 unsigned long long get_ticks(void)
  35 {
  36         return get_timer(0);
  37 }
  38
  39 ulong get_tbclk(void)
  40 {
  41         return CONFIG_SYS_HZ;
  42 }
  43
  44 void __udelay(unsigned long usec)
  45 {
  46         ulong endtime;
  47         signed long diff;
  48
  49         endtime = get_timer(0) + usec;
  50
  51         do {
  52                 ulong now = get_timer(0);
  53                 diff = endtime - now;
  54         } while (diff >= 0);
  55 }