arch/arm/cpu/armv7/arch_timer.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2012-2014
   4  *     Texas Instruments Incorporated, <www.ti.com>
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <div64.h>
  10 #include <bootstage.h>
  11
  12 DECLARE_GLOBAL_DATA_PTR;
  13
  14 #ifndef CONFIG_SYS_HZ_CLOCK
  15 static inline u32 read_cntfrq(void)
  16 {
  17         u32 frq;
  18
  19         asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (frq));
  20         return frq;
  21 }
  22 #endif
  23
  24 int timer_init(void)
  25 {
  26         gd->arch.tbl = 0;
  27         gd->arch.tbu = 0;
  28
  29 #ifdef CONFIG_SYS_HZ_CLOCK
  30         gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK;
  31 #else
  32         gd->arch.timer_rate_hz = read_cntfrq();
  33 #endif
  34         return 0;
  35 }
  36
  37 unsigned long long get_ticks(void)
  38 {
  39         ulong nowl, nowu;
  40
  41         asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
  42
  43         gd->arch.tbl = nowl;
  44         gd->arch.tbu = nowu;
  45
  46         return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
  47 }
  48
  49
  50 ulong timer_get_boot_us(void)
  51 {
  52         if (!gd->arch.timer_rate_hz)
  53                 timer_init();
  54
  55         return lldiv(get_ticks(), gd->arch.timer_rate_hz / 1000000);
  56 }
  57
  58 ulong get_tbclk(void)
  59 {
  60         return gd->arch.timer_rate_hz;
  61 }