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/* SPDX-License-Identifier: BSD-3-Clause */
#include <device/mmio.h>
#include <delay.h>
#include <soc/iomap.h>
#include <soc/ipq_timer.h>
#include <timer.h>
#define GCNT_FREQ_MHZ 48
#define TIMER_TICKS(us) (GCNT_FREQ_MHZ * (us))
#define TIMER_USECS(ticks) ((ticks) / GCNT_FREQ_MHZ)
/**
* init_timer - initialize timer
*/
void init_timer(void)
{
/* disable timer */
write32(GCNT_CNTCR, 0);
/* Reset the counters to zero */
write32(GCNT_GLB_CNTCV_LO, 0);
write32(GCNT_GLB_CNTCV_HI, 0);
/* Enable timer */
write32(GCNT_CNTCR, 1);
}
static inline uint64_t read_gcnt_val(void)
{
uint32_t hi, lo;
do {
hi = read32(GCNT_CNTCV_HI);
lo = read32(GCNT_CNTCV_LO);
} while (hi != read32(GCNT_CNTCV_HI));
return ((((uint64_t)hi) << 32) | lo);
}
/**
* udelay - generates micro second delay.
* @param usec: delay duration in microseconds
*/
void udelay(unsigned int usec)
{
uint64_t expire;
expire = read_gcnt_val() + TIMER_TICKS(usec);
while (expire >= read_gcnt_val())
;
}
void timer_monotonic_get(struct mono_time *mt)
{
mono_time_set_usecs(mt, TIMER_USECS(read_gcnt_val()));
}
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