time.c
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/*
* (C) Copyright 2000-2009
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <timer.h>
#include <watchdog.h>
#include <div64.h>
#include <asm/io.h>
#ifndef CONFIG_WD_PERIOD
# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default */
#endif
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SYS_TIMER_RATE
/* Returns tick rate in ticks per second */
ulong notrace get_tbclk(void)
{
return CONFIG_SYS_TIMER_RATE;
}
#endif
#ifdef CONFIG_SYS_TIMER_COUNTER
unsigned long notrace timer_read_counter(void)
{
#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
return ~readl(CONFIG_SYS_TIMER_COUNTER);
#else
return readl(CONFIG_SYS_TIMER_COUNTER);
#endif
}
ulong timer_get_boot_us(void)
{
ulong count = timer_read_counter();
#if CONFIG_SYS_TIMER_RATE == 1000000
return count;
#elif CONFIG_SYS_TIMER_RATE > 1000000
return lldiv(count, CONFIG_SYS_TIMER_RATE / 1000000);
#elif defined(CONFIG_SYS_TIMER_RATE)
return (unsigned long long)count * 1000000 / CONFIG_SYS_TIMER_RATE;
#else
/* Assume the counter is in microseconds */
return count;
#endif
}
#else
extern unsigned long __weak timer_read_counter(void);
#endif
#ifdef CONFIG_TIMER
ulong notrace get_tbclk(void)
{
if (!gd->timer) {
#ifdef CONFIG_TIMER_EARLY
return timer_early_get_rate();
#else
int ret;
ret = dm_timer_init();
if (ret)
return ret;
#endif
}
return timer_get_rate(gd->timer);
}
uint64_t notrace get_ticks(void)
{
u64 count;
int ret;
if (!gd->timer) {
#ifdef CONFIG_TIMER_EARLY
return timer_early_get_count();
#else
int ret;
ret = dm_timer_init();
if (ret)
return ret;
#endif
}
ret = timer_get_count(gd->timer, &count);
if (ret)
return ret;
return count;
}
#else /* !CONFIG_TIMER */
uint64_t __weak notrace get_ticks(void)
{
unsigned long now = timer_read_counter();
/* increment tbu if tbl has rolled over */
if (now < gd->timebase_l)
gd->timebase_h++;
gd->timebase_l = now;
return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
}
#endif /* CONFIG_TIMER */
/* Returns time in milliseconds */
static uint64_t notrace tick_to_time(uint64_t tick)
{
ulong div = get_tbclk();
tick *= CONFIG_SYS_HZ;
do_div(tick, div);
return tick;
}
int __weak timer_init(void)
{
return 0;
}
/* Returns time in milliseconds */
ulong __weak get_timer(ulong base)
{
return tick_to_time(get_ticks()) - base;
}
unsigned long __weak notrace timer_get_us(void)
{
return tick_to_time(get_ticks() * 1000);
}
static uint64_t usec_to_tick(unsigned long usec)
{
uint64_t tick = usec;
tick *= get_tbclk();
do_div(tick, 1000000);
return tick;
}
void __weak __udelay(unsigned long usec)
{
uint64_t tmp;
tmp = get_ticks() + usec_to_tick(usec); /* get current timestamp */
while (get_ticks() < tmp+1) /* loop till event */
/*NOP*/;
}
/* ------------------------------------------------------------------------- */
void udelay(unsigned long usec)
{
ulong kv;
do {
WATCHDOG_RESET();
kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
__udelay (kv);
usec -= kv;
} while(usec);
}