cmd/sleep.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <command.h>
   8 #include <console.h>
   9 #include <time.h>
  10 #include <vsprintf.h>
  11 #include <linux/delay.h>
  12
  13 static int do_sleep(struct cmd_tbl *cmdtp, int flag, int argc,
  14                     char *const argv[])
  15 {
  16         ulong start = get_timer(0);
  17         ulong mdelay = 0;
  18         ulong delay;
  19         char *frpart;
  20
  21         if (argc != 2)
  22                 return CMD_RET_USAGE;
  23
  24         delay = dectoul(argv[1], NULL) * CONFIG_SYS_HZ;
  25
  26         frpart = strchr(argv[1], '.');
  27
  28         if (frpart) {
  29                 uint mult = CONFIG_SYS_HZ / 10;
  30                 for (frpart++; *frpart != '\0' && mult > 0; frpart++) {
  31                         if (*frpart < '0' || *frpart > '9') {
  32                                 mdelay = 0;
  33                                 break;
  34                         }
  35                         mdelay += (*frpart - '0') * mult;
  36                         mult /= 10;
  37                 }
  38         }
  39
  40         delay += mdelay;
  41
  42         while (get_timer(start) < delay) {
  43                 if (ctrlc())
  44                         return CMD_RET_FAILURE;
  45
  46                 udelay(100);
  47         }
  48
  49         return 0;
  50 }
  51
  52 U_BOOT_CMD(
  53         sleep ,    2,    1,     do_sleep,
  54         "delay execution for some time",
  55         "N\n"
  56         "    - delay execution for N seconds (N is _decimal_ and can be\n"
  57         "      fractional)"
  58 );