plat/mediatek/mt6795/plat_delay_timer.c

   1 /*
   2  * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
   3  *
   4  * SPDX-License-Identifier: BSD-3-Clause
   5  */
   6
   7 #include <arch_helpers.h>
   8 #include <delay_timer.h>
   9 #include <platform_def.h>
  10
  11 static uint32_t plat_get_timer_value(void)
  12 {
  13         /*
  14          * Generic delay timer implementation expects the timer to be a down
  15          * counter. We apply bitwise NOT operator to the tick values returned
  16          * by read_cntpct_el0() to simulate the down counter.
  17          */
  18         return (uint32_t)(~read_cntpct_el0());
  19 }
  20
  21 static const timer_ops_t plat_timer_ops = {
  22         .get_timer_value        = plat_get_timer_value,
  23         .clk_mult               = 1,
  24         .clk_div                = SYS_COUNTER_FREQ_IN_MHZ,
  25 };
  26
  27 void plat_delay_timer_init(void)
  28 {
  29         timer_init(&plat_timer_ops);
  30 }