sys/arch/evbarm/iq31244/iq31244_machdep.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 2009 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __KERNEL_RCSID(0, "$NetBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/device.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/reboot.h>
  37
  38 #include <dev/i2c/m41st84var.h>
  39
  40 void iq31244_reboot(int);       /* I80321_REBOOT */
  41
  42 /*
  43  * Resetting the peripherals like the IQ80321 does isn't
  44  * a sufficient reset for the IQ31244.  With the stock
  45  * Redboot, that reset will leave it in the Redboot
  46  * debugger on reinit.
  47  * The IQ31244 has an M41ST84, however, that can reset
  48  * the board with the watchdog.  So we just set it to
  49  * do so here.
  50  * The wdog on the 41ST84 should probably be a real
  51  * device, but for now, we just kick it here.
  52  */
  53 void
  54 iq31244_reboot(int howto)
  55 {
  56
  57         /* We can't halt; just reset. */
  58         if ((howto & RB_HALT) == 0) {
  59                 device_t        dv;
  60
  61                 dv = device_find_by_xname("strtc0");
  62                 if (dv == NULL)
  63                 {
  64                         printf("No strtc0!  Reset will probably fail!\n");
  65                         return;
  66                 }
  67
  68                 /*
  69                  * 0x80 == steer to reset
  70                  * 0x04 == multiplier 1, resolution 1/16s
  71                  */
  72                 strtc_wdog_config(device_private(dv), 0x84);
  73                 delay(10000);
  74         }
  75 }