commands/sleep.c

   1 /*
   2  * sleep.c - delay execution
   3  *
   4  * Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <common.h>
  24 #include <command.h>
  25 #include <clock.h>
  26
  27 static int do_sleep (cmd_tbl_t *cmdtp, int argc, char *argv[])
  28 {
  29         uint64_t start;
  30         ulong delay;
  31
  32         if (argc != 2)
  33                 return COMMAND_ERROR_USAGE;
  34
  35         delay = simple_strtoul(argv[1], NULL, 10);
  36
  37         start = get_time_ns();
  38         while (!is_timeout(start, delay * SECOND)) {
  39                 if (ctrlc())
  40                         return 1;
  41         }
  42
  43         return 0;
  44 }
  45
  46 U_BOOT_CMD_START(sleep)
  47         .cmd            = do_sleep,
  48         .usage          = "delay execution for n seconds",
  49 U_BOOT_CMD_END