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 <watchdog.h>
  10 #include <div64.h>
  11 #include <asm/io.h>
  12
  13 #ifndef CONFIG_WD_PERIOD
  14 # define CONFIG_WD_PERIOD       (10 * 1000 * 1000)      /* 10 seconds default */
  15 #endif
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19 #ifdef CONFIG_SYS_TIMER_RATE
  20 /* Returns tick rate in ticks per second */
  21 ulong notrace get_tbclk(void)
  22 {
  23         return CONFIG_SYS_TIMER_RATE;
  24 }
  25 #endif
  26
  27 #ifdef CONFIG_SYS_TIMER_COUNTER
  28 unsigned long notrace timer_read_counter(void)
  29 {
  30 #ifdef CONFIG_SYS_TIMER_COUNTS_DOWN
  31         return ~readl(CONFIG_SYS_TIMER_COUNTER);
  32 #else
  33         return readl(CONFIG_SYS_TIMER_COUNTER);
  34 #endif
  35 }
  36 #else
  37 extern unsigned long __weak timer_read_counter(void);
  38 #endif
  39
  40 uint64_t __weak notrace get_ticks(void)
  41 {
  42         unsigned long now = timer_read_counter();
  43
  44         /* increment tbu if tbl has rolled over */
  45         if (now < gd->timebase_l)
  46                 gd->timebase_h++;
  47         gd->timebase_l = now;
  48         return ((uint64_t)gd->timebase_h << 32) | gd->timebase_l;
  49 }
  50
  51 /* Returns time in milliseconds */
  52 static uint64_t notrace tick_to_time(uint64_t tick)
  53 {
  54         ulong div = get_tbclk();
  55
  56         tick *= CONFIG_SYS_HZ;
  57         do_div(tick, div);
  58         return tick;
  59 }
  60
  61 int __weak timer_init(void)
  62 {
  63         return 0;
  64 }
  65
  66 /* Returns time in milliseconds */
  67 ulong __weak get_timer(ulong base)
  68 {
  69         return tick_to_time(get_ticks()) - base;
  70 }
  71
  72 unsigned long __weak notrace timer_get_us(void)
  73 {
  74         return tick_to_time(get_ticks() * 1000);
  75 }
  76
  77 static uint64_t usec_to_tick(unsigned long usec)
  78 {
  79         uint64_t tick = usec;
  80         tick *= get_tbclk();
  81         do_div(tick, 1000000);
  82         return tick;
  83 }
  84
  85 void __weak __udelay(unsigned long usec)
  86 {
  87         uint64_t tmp;
  88
  89         tmp = get_ticks() + usec_to_tick(usec); /* get current timestamp */
  90
  91         while (get_ticks() < tmp+1)     /* loop till event */
  92                  /*NOP*/;
  93 }
  94
  95 /* ------------------------------------------------------------------------- */
  96
  97 void udelay(unsigned long usec)
  98 {
  99         ulong kv;
 100
 101         do {
 102                 WATCHDOG_RESET();
 103                 kv = usec > CONFIG_WD_PERIOD ? CONFIG_WD_PERIOD : usec;
 104                 __udelay (kv);
 105                 usec -= kv;
 106         } while(usec);
 107 }
 108
 109 void mdelay(unsigned long msec)
 110 {
 111         while (msec--)
 112                 udelay(1000);
 113 }