mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-05 20:54:31 +00:00
5bc516ed66
Currently, mdelay() and udelay() are declared in include/common.h, while ndelay() in include/linux/compat.h. It would be nice to collect them into include/linux/delay.h like Linux. While we are here, fix the ndelay() implementation; I used the DIV_ROUND_UP() instead of (x)/1000 because it must wait *longer* than the given period of time. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Simon Glass <sjg@chromium.org>
156 lines
2.7 KiB
C
156 lines
2.7 KiB
C
/*
|
|
* (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
|
|
}
|
|
#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);
|
|
}
|