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