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
  16 ulong get_timer (ulong base)
  17 {
  18         return get_timer_masked ();
  19 }
  20
  21 void __udelay (unsigned long usec)
  22 {
  23         udelay_masked (usec);
  24 }
  25
  26 ulong get_timer_masked (void)
  27 {
  28         return OSCR;
  29 }
  30
  31 void 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  */
  58 unsigned 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  */
  67 ulong get_tbclk (void)
  68 {
  69         return CONFIG_SYS_HZ;
  70 }