src/soc/samsung/exynos5420/timer.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/mmio.h>
   4 #include <delay.h>
   5 #include <soc/clk.h>
   6 #include <stdint.h>
   7 #include <timer.h>
   8
   9 static const uint32_t clocks_per_usec = MCT_HZ/1000000;
  10
  11 static uint64_t mct_raw_value(void)
  12 {
  13         uint64_t upper = read32(&exynos_mct->g_cnt_u);
  14         uint64_t lower = read32(&exynos_mct->g_cnt_l);
  15
  16         return (upper << 32) | lower;
  17 }
  18
  19 void init_timer(void)
  20 {
  21         write32(&exynos_mct->g_tcon, read32(&exynos_mct->g_tcon) | (0x1 << 8));
  22 }
  23
  24 void timer_monotonic_get(struct mono_time *mt)
  25 {
  26         /* We don't have to call mct_start() here
  27          * because it was already called in the bootblock
  28          */
  29
  30         mono_time_set_usecs(mt, mct_raw_value() / clocks_per_usec);
  31 }