LXR uboot/arch/arm/cpu/sa1100/timer.c

   1/*
   2 * (C) Copyright 2002
   3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4 * Marius Groeger <mgroeger@sysgo.de>
   5 *
   6 * (C) Copyright 2002
   7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   8 * Alex Zuepke <azu@sysgo.de>
   9 *
  10 * SPDX-License-Identifier:     GPL-2.0+
  11 */
  12
  13#include <common.h>
  14#include <SA-1100.h>
  15
  16ulong get_timer (ulong base)
  17{
  18        return get_timer_masked ();
  19}
  20
  21void __udelay (unsigned long usec)
  22{
  23        udelay_masked (usec);
  24}
  25
  26ulong get_timer_masked (void)
  27{
  28        return OSCR;
  29}
  30
  31void udelay_masked (unsigned long usec)
  32{
  33        ulong tmo;
  34        ulong endtime;
  35        signed long diff;
  36
  37        if (usec >= 1000) {
  38                tmo = usec / 1000;
  39                tmo *= CONFIG_SYS_HZ;
  40                tmo /= 1000;
  41        } else {
  42                tmo = usec * CONFIG_SYS_HZ;
  43                tmo /= (1000*1000);
  44        }
  45
  46        endtime = get_timer_masked () + tmo;
  47
  48        do {
  49                ulong now = get_timer_masked ();
  50                diff = endtime - now;
  51        } while (diff >= 0);
  52}
  53
  54/*
  55 * This function is derived from PowerPC code (read timebase as long long).
  56 * On ARM it just returns the timer value.
  57 */
  58unsigned long long get_ticks(void)
  59{
  60        return get_timer(0);
  61}
  62
  63/*
  64 * This function is derived from PowerPC code (timebase clock frequency).
  65 * On ARM it returns the number of timer ticks per second.
  66 */
  67ulong get_tbclk (void)
  68{
  69        ulong tbclk;
  70
  71        tbclk = CONFIG_SYS_HZ;
  72        return tbclk;
  73}
  74