LXR uboot/arch/arm/cpu/armv7/arch

   1/*
   2 * (C) Copyright 2012-2014
   3 *     Texas Instruments Incorporated, <www.ti.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <asm/io.h>
  10#include <div64.h>
  11
  12DECLARE_GLOBAL_DATA_PTR;
  13
  14int timer_init(void)
  15{
  16        gd->arch.tbl = 0;
  17        gd->arch.tbu = 0;
  18
  19        gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ;
  20
  21        return 0;
  22}
  23
  24unsigned long long get_ticks(void)
  25{
  26        ulong nowl, nowu;
  27
  28        asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
  29
  30        gd->arch.tbl = nowl;
  31        gd->arch.tbu = nowu;
  32
  33        return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
  34}
  35
  36
  37ulong get_timer(ulong base)
  38{
  39        return lldiv(get_ticks(), gd->arch.timer_rate_hz) - base;
  40}
  41
  42void __udelay(unsigned long usec)
  43{
  44        unsigned long long endtime;
  45
  46        endtime = lldiv((unsigned long long)usec * gd->arch.timer_rate_hz,
  47                        1000UL);
  48
  49        endtime += get_ticks();
  50
  51        while (get_ticks() < endtime)
  52                ;
  53}
  54
  55ulong get_tbclk(void)
  56{
  57        return gd->arch.timer_rate_hz;
  58}
  59