arch/mips/vr41xx/common/pmu.c

   1 /*
   2  *  pmu.c, Power Management Unit routines for NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2003-2004  Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/smp.h>
  23 #include <linux/types.h>
  24
  25 #include <asm/cpu.h>
  26 #include <asm/io.h>
  27 #include <asm/reboot.h>
  28 #include <asm/system.h>
  29
  30 #define PMUCNT2REG      KSEG1ADDR(0x0f0000c6)
  31  #define SOFTRST        0x0010
  32
  33 static inline void software_reset(void)
  34 {
  35         uint16_t val;
  36
  37         switch (current_cpu_data.cputype) {
  38         case CPU_VR4122:
  39         case CPU_VR4131:
  40         case CPU_VR4133:
  41                 val = readw(PMUCNT2REG);
  42                 val |= SOFTRST;
  43                 writew(val, PMUCNT2REG);
  44                 break;
  45         default:
  46                 break;
  47         }
  48 }
  49
  50 static void vr41xx_restart(char *command)
  51 {
  52         local_irq_disable();
  53         software_reset();
  54         printk(KERN_NOTICE "\nYou can reset your system\n");
  55         while (1) ;
  56 }
  57
  58 static void vr41xx_halt(void)
  59 {
  60         local_irq_disable();
  61         printk(KERN_NOTICE "\nYou can turn off the power supply\n");
  62         while (1) ;
  63 }
  64
  65 static void vr41xx_power_off(void)
  66 {
  67         local_irq_disable();
  68         printk(KERN_NOTICE "\nYou can turn off the power supply\n");
  69         while (1) ;
  70 }
  71
  72 static int __init vr41xx_pmu_init(void)
  73 {
  74         _machine_restart = vr41xx_restart;
  75         _machine_halt = vr41xx_halt;
  76         _machine_power_off = vr41xx_power_off;
  77
  78         return 0;
  79 }
  80
  81 early_initcall(vr41xx_pmu_init);