LXR uboot/arch/arm/cpu/armv8/generic

   1/*
   2 * (C) Copyright 2013
   3 * David Feng <fenghua@phytium.com.cn>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <command.h>
  10#include <asm/system.h>
  11
  12DECLARE_GLOBAL_DATA_PTR;
  13
  14/*
  15 * Generic timer implementation of get_tbclk()
  16 */
  17unsigned long get_tbclk(void)
  18{
  19        unsigned long cntfrq;
  20        asm volatile("mrs %0, cntfrq_el0" : "=r" (cntfrq));
  21        return cntfrq;
  22}
  23
  24/*
  25 * Generic timer implementation of timer_read_counter()
  26 */
  27unsigned long timer_read_counter(void)
  28{
  29        unsigned long cntpct;
  30#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
  31        /* This erratum number needs to be confirmed to match ARM document */
  32        unsigned long temp;
  33#endif
  34        isb();
  35        asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
  36#ifdef CONFIG_SYS_FSL_ERRATUM_A008585
  37        asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
  38        while (temp != cntpct) {
  39                asm volatile("mrs %0, cntpct_el0" : "=r" (cntpct));
  40                asm volatile("mrs %0, cntpct_el0" : "=r" (temp));
  41        }
  42#endif
  43        return cntpct;
  44}
  45
  46unsigned long long get_ticks(void)
  47{
  48        unsigned long ticks = timer_read_counter();
  49
  50        gd->arch.tbl = ticks;
  51
  52        return ticks;
  53}
  54
  55unsigned long usec2ticks(unsigned long usec)
  56{
  57        ulong ticks;
  58        if (usec < 1000)
  59                ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
  60        else
  61                ticks = ((usec / 10) * (get_tbclk() / 100000));
  62
  63        return ticks;
  64}
  65