arch/powerpc/platforms/85xx/misc.c

   1 /*
   2  * MPC85xx generic code.
   3  *
   4  * Maintained by Kumar Gala (see MAINTAINERS for contact information)
   5  *
   6  * Copyright 2005 Freescale Semiconductor Inc.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13 #include <linux/irq.h>
  14 #include <linux/module.h>
  15 #include <asm/irq.h>
  16 #include <asm/io.h>
  17 #include <asm/prom.h>
  18 #include <sysdev/fsl_soc.h>
  19
  20 static __be32 __iomem *rstcr;
  21
  22 extern void abort(void);
  23
  24 static int __init mpc85xx_rstcr(void)
  25 {
  26         struct device_node *np;
  27         np = of_find_node_by_name(NULL, "global-utilities");
  28         if ((np && of_get_property(np, "fsl,has-rstcr", NULL))) {
  29                 const u32 *prop = of_get_property(np, "reg", NULL);
  30                 if (prop) {
  31                         /* map reset control register
  32                          * 0xE00B0 is offset of reset control register
  33                          */
  34                         rstcr = ioremap(get_immrbase() + *prop + 0xB0, 0xff);
  35                         if (!rstcr)
  36                                 printk (KERN_EMERG "Error: reset control "
  37                                                 "register not mapped!\n");
  38                 }
  39         } else
  40                 printk (KERN_INFO "rstcr compatible register does not exist!\n");
  41         if (np)
  42                 of_node_put(np);
  43         return 0;
  44 }
  45
  46 arch_initcall(mpc85xx_rstcr);
  47
  48 void mpc85xx_restart(char *cmd)
  49 {
  50         local_irq_disable();
  51         if (rstcr)
  52                 /* set reset control register */
  53                 out_be32(rstcr, 0x2);   /* HRESET_REQ */
  54         abort();
  55 }