lib/time.c

   1 /*
   2  * (C) Copyright 2000-2009
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <timer.h>
  12 #include <watchdog.h>
  13 #include <div64.h>
  14 #include <asm/io.h>
  15
  16 #ifndef CONFIG_WD_PERIOD
  17 # define CONFIG_WD_PERIOD       (10 * 1000 * 1000)      /* 10 seconds default */
  18 #endif
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 #ifdef CONFIG_SYS_TIMER_RATE
  23 /* Returns tick rate in ticks per second */
  24 ulong notrace get_tbclk(void)
  25 {
  26         return CONFIG_SYS_TIMER_RATE;
  27 }
  28 #endif
  29
  30 #ifdef CONFIG_SYS_TIMER_COUNTER
  31 unsigned long notrace timer_read_counter(void)
  32 {
  33 #ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
  34         return ~readl(CONFIG_SYS_TIMER_COUNTER);
  35 #else
  36         return readl(CONFIG_SYS_TIMER_COUNTER);
  37 #endif
  38 }
  39
  40 ulong timer_get_boot_us(void)
  41 {
  42         ulong count = timer_read_counter();
  43
  44 #if CONFIG_SYS_TIMER_RATE == 1000000
  45         return count;
  46 #elif CONFIG_SYS_TIMER_RATE > 1000000
  47         return lldiv(count, CONFIG_SYS_TIMER_RATE / 1000000);
  48 #elif defined(CONFIG_SYS_TIMER_RATE)
  49         return (unsigned long long)count * 1000000 / CONFIG_SYS_TIMER_RATE;
  50 #else
  51         /* Assume the counter is in microseconds */
  52         return count;
  53 #endif
  54 }
  55
  56 #else
  57 extern unsigned long __weak timer_read_counter(void);
  58 #endif
  59
  60 #ifdef CONFIG_TIMER
  61 ulong notrace get_tbclk(void)
  62 {
  63         if (!gd->timer) {
  64 #ifdef CONFIG_TIMER_EARLY
  65                 return timer_early_get_rate();
  66 #else
  67                 int ret;
  68
  69                 ret = dm_timer_init();
  70                 if (ret)
  71                         return ret;
  72 #endif
  73         }
  74
  75         return timer_get_rate(gd->timer);
  76 }
  77
  78 uint64_t notrace get_ticks(void)
  79 {
  80         u64 count;
  81         int ret;
  82
  83         if (!gd->timer) {
  84 #ifdef CONFIG_TIMER_EARLY
  85                 return timer_early_get_count();
  86 #else
  87                 int ret;
  88
  89                 ret = dm_timer_init();
  90                 if (ret)
  91                         return ret;
  92 #endif
  93         }
  94
  95         ret = timer_get_count(gd->timer, &count);
  96         if (ret)
  97                 return ret;
  98
  99         return count;
 100 }
 101
 102 #else /* !CONFIG_TIMER */
 103
 104 uint64_t __weak notrace get_ticks(void)
 105 {
 106         unsigned long now = timer_read_counter();
 107
 108         /* increment tbu if tbl has rolled over */
 109         if (now < gd->timebase_l)
 110                 gd->timebase_h++;
 111         gd->timebase_l = now;
 112         return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
 113 }
 114
 115 #endif /* CONFIG_TIMER */
 116
 117 /* Returns time in milliseconds */
 118 static uint64_t notrace tick_to_time(uint64_t tick)
 119 {
 120         ulong div = get_tbclk();
 121
 122         tick *= CONFIG_SYS_HZ;
 123         do_div(tick, div);
 124         return tick;
 125 }
 126
 127 int __weak timer_init(void)
 128 {
 129         return 0;
 130 }
 131
 132 /* Returns time in milliseconds */
 133 ulong __weak get_timer(ulong base)
 134 {
 135         return tick_to_time(get_ticks()) - base;
 136 }
 137
 138 unsigned long __weak notrace timer_get_us(void)
 139 {
 140         return tick_to_time(get_ticks() * 1000);
 141 }
 142
 143 static uint64_t usec_to_tick(unsigned long usec)
 144 {
 145         uint64_t tick = usec;
 146         tick *= get_tbclk();
 147         do_div(tick, 1000000);
 148         return tick;
 149 }
 150
 151 void __weak __udelay(unsigned long usec)
 152 {
 153         uint64_t tmp;
 154
 155         tmp = get_ticks() + usec_to_tick(usec); /* get current timestamp */
 156
 157         while (get_ticks() < tmp+1)     /* loop till event */
 158                  /*NOP*/;
 159 }
 160
 161 /* ------------------------------------------------------------------------- */
 162
 163 void udelay(unsigned long usec)
 164 {
 165         ulong kv;
 166
 167         do {
 168                 WATCHDOG_RESET();
 169                 kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
 170                 __udelay (kv);
 171                 usec -= kv;
 172         } while(usec);
 173 }