fccacd3b4c
As I initially suspected overflow in time handling, I took a detailed look at lib/time.c. This adds comments about units being used, reduces amount of type casting being done, and makes __udelay() always wait at least one tick. (Current code could do no delaying at all for short delays). Signed-off-by: Pavel Machek <pavel@denx.de>
118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
/*
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* (C) Copyright 2000-2009
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <div64.h>
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#include <asm/io.h>
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#if CONFIG_SYS_HZ != 1000
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#warning "CONFIG_SYS_HZ must be 1000 and should not be defined by platforms"
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#endif
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#ifndef CONFIG_WD_PERIOD
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# define CONFIG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default */
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SYS_TIMER_RATE
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/* Returns tick rate in ticks per second */
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ulong notrace get_tbclk(void)
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{
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return CONFIG_SYS_TIMER_RATE;
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}
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#endif
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#ifdef CONFIG_SYS_TIMER_COUNTER
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unsigned long notrace timer_read_counter(void)
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{
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#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
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return ~readl(CONFIG_SYS_TIMER_COUNTER);
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#else
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return readl(CONFIG_SYS_TIMER_COUNTER);
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#endif
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}
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#else
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extern unsigned long __weak timer_read_counter(void);
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#endif
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unsigned long long __weak notrace get_ticks(void)
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{
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unsigned long now = timer_read_counter();
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/* increment tbu if tbl has rolled over */
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if (now < gd->timebase_l)
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gd->timebase_h++;
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gd->timebase_l = now;
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return ((unsigned long long)gd->timebase_h << 32) | gd->timebase_l;
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}
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/* Returns time in milliseconds */
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static unsigned long long notrace tick_to_time(unsigned long long tick)
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{
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ulong div = get_tbclk();
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tick *= CONFIG_SYS_HZ;
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do_div(tick, div);
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return tick;
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}
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int __weak timer_init(void)
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{
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return 0;
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}
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/* Returns time in milliseconds */
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ulong __weak get_timer(ulong base)
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{
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return tick_to_time(get_ticks()) - base;
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}
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unsigned long __weak notrace timer_get_us(void)
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{
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return tick_to_time(get_ticks() * 1000);
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}
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static unsigned long long usec_to_tick(unsigned long usec)
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{
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unsigned long long tick = usec;
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tick *= get_tbclk();
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do_div(tick, 1000000);
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return tick;
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}
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void __weak __udelay(unsigned long usec)
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{
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unsigned long long tmp;
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tmp = get_ticks() + usec_to_tick(usec); /* get current timestamp */
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while (get_ticks() < tmp+1) /* loop till event */
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/*NOP*/;
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}
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/* ------------------------------------------------------------------------- */
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void udelay(unsigned long usec)
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{
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ulong kv;
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do {
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WATCHDOG_RESET();
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kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
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__udelay (kv);
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usec -= kv;
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} while(usec);
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}
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void mdelay(unsigned long msec)
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{
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while (msec--)
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udelay(1000);
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}
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