arch/powerpc/platforms/83xx/misc.c

   1 /*
   2  * misc setup functions for MPC83xx
   3  *
   4  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14
  15 #include <asm/io.h>
  16 #include <asm/hw_irq.h>
  17 #include <sysdev/fsl_soc.h>
  18
  19 #include "mpc83xx.h"
  20
  21 static __be32 __iomem *restart_reg_base;
  22
  23 static int __init mpc83xx_restart_init(void)
  24 {
  25         /* map reset restart_reg_baseister space */
  26         restart_reg_base = ioremap(get_immrbase() + 0x900, 0xff);
  27
  28         return 0;
  29 }
  30
  31 arch_initcall(mpc83xx_restart_init);
  32
  33 void mpc83xx_restart(char *cmd)
  34 {
  35 #define RST_OFFSET      0x00000900
  36 #define RST_PROT_REG    0x00000018
  37 #define RST_CTRL_REG    0x0000001c
  38
  39         local_irq_disable();
  40
  41         if (restart_reg_base) {
  42                 /* enable software reset "RSTE" */
  43                 out_be32(restart_reg_base + (RST_PROT_REG >> 2), 0x52535445);
  44
  45                 /* set software hard reset */
  46                 out_be32(restart_reg_base + (RST_CTRL_REG >> 2), 0x2);
  47         } else {
  48                 printk (KERN_EMERG "Error: Restart registers not mapped, spinning!\n");
  49         }
  50
  51         for (;;) ;
  52 }
  53
  54 long __init mpc83xx_time_init(void)
  55 {
  56 #define SPCR_OFFSET     0x00000110
  57 #define SPCR_TBEN       0x00400000
  58         __be32 __iomem *spcr = ioremap(get_immrbase() + SPCR_OFFSET, 4);
  59         __be32 tmp;
  60
  61         tmp = in_be32(spcr);
  62         out_be32(spcr, tmp | SPCR_TBEN);
  63
  64         iounmap(spcr);
  65
  66         return 0;
  67 }