timer.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/mmio.h>
#include <delay.h>
#include <soc/clk.h>
#include <stdint.h>
#include <timer.h>
 
static const uint32_t clocks_per_usec = MCT_HZ/1000000;
 
static uint64_t mct_raw_value(void)
{
        uint64_t upper = read32(&exynos_mct->g_cnt_u);
        uint64_t lower = read32(&exynos_mct->g_cnt_l);
 
        return (upper << 32) | lower;
}
 
void init_timer(void)
{
        write32(&exynos_mct->g_tcon, read32(&exynos_mct->g_tcon) | (0x1 << 8));
}
 
void timer_monotonic_get(struct mono_time *mt)
{
        /* We don't have to call mct_start() here
         * because it was already called in the bootblock
         */
 
        mono_time_set_usecs(mt, mct_raw_value() / clocks_per_usec);
}