diff options
Diffstat (limited to 'lib/time.c')
| -rw-r--r-- | lib/time.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/lib/time.c b/lib/time.c new file mode 100644 index 00000000000..872f73d521e --- /dev/null +++ b/lib/time.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2000-2009 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + */ + +#include <clock_legacy.h> +#include <bootstage.h> +#include <dm.h> +#include <errno.h> +#include <init.h> +#include <spl.h> +#include <time.h> +#include <timer.h> +#include <watchdog.h> +#include <div64.h> +#include <asm/global_data.h> +#include <asm/io.h> +#include <linux/delay.h> + +#ifndef CFG_WD_PERIOD +# define CFG_WD_PERIOD (10 * 1000 * 1000) /* 10 seconds default */ +#endif + +DECLARE_GLOBAL_DATA_PTR; + +#ifdef CFG_SYS_TIMER_RATE +/* Returns tick rate in ticks per second */ +ulong notrace get_tbclk(void) +{ + return CFG_SYS_TIMER_RATE; +} +#endif + +#ifdef CFG_SYS_TIMER_COUNTER +unsigned long notrace timer_read_counter(void) +{ +#ifdef CONFIG_SYS_TIMER_COUNTS_DOWN + return ~readl(CFG_SYS_TIMER_COUNTER); +#else + return readl(CFG_SYS_TIMER_COUNTER); +#endif +} + +ulong timer_get_boot_us(void) +{ + ulong count = timer_read_counter(); + +#ifdef CFG_SYS_TIMER_RATE + const ulong timer_rate = CFG_SYS_TIMER_RATE; + + if (timer_rate == 1000000) + return count; + else if (timer_rate > 1000000) + return lldiv(count, timer_rate / 1000000); + else + return (unsigned long long)count * 1000000 / timer_rate; +#else + /* Assume the counter is in microseconds */ + return count; +#endif +} + +#else +extern unsigned long timer_read_counter(void); +#endif + +#if CONFIG_IS_ENABLED(TIMER) +ulong notrace get_tbclk(void) +{ + if (!gd->timer) { + int ret; + + if (IS_ENABLED(CONFIG_TIMER_EARLY)) + return timer_early_get_rate(); + + ret = dm_timer_init(); + if (ret) + return ret; + } + + return timer_get_rate(gd->timer); +} + +uint64_t notrace get_ticks(void) +{ + u64 count; + int ret; + + if (!gd->timer) { + int ret; + + if (IS_ENABLED(CONFIG_TIMER_EARLY)) + return timer_early_get_count(); + + ret = dm_timer_init(); + if (ret) + panic("Could not initialize timer (err %d)\n", ret); + } + + ret = timer_get_count(gd->timer, &count); + if (ret) { + if (spl_phase() > PHASE_TPL) + panic("Could not read count from timer (err %d)\n", + ret); + else + panic("no timer (err %d)\n", 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; +} + +static uint64_t notrace tick_to_time_us(uint64_t tick) +{ + ulong div = get_tbclk() / 1000; + + tick *= CONFIG_SYS_HZ; + do_div(tick, div); + return tick; +} + +uint64_t __weak get_timer_us(uint64_t base) +{ + return tick_to_time_us(get_ticks()) - base; +} + +unsigned long __weak get_timer_us_long(unsigned long base) +{ + return timer_get_us() - base; +} + +unsigned long __weak notrace timer_get_us(void) +{ + return tick_to_time(get_ticks() * 1000); +} + +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 { + schedule(); + kv = usec > CFG_WD_PERIOD ? CFG_WD_PERIOD : usec; + __udelay(kv); + usec -= kv; + } while(usec); +} |