arch/mips/sgi-ip27/ip27-reset.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Reset an IP27.
   7  *
   8  * Copyright (C) 1997, 1998, 1999, 2000, 06 by Ralf Baechle
   9  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  10  */
  11 #include <linux/config.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/timer.h>
  15 #include <linux/smp.h>
  16 #include <linux/mmzone.h>
  17 #include <linux/nodemask.h>
  18 #include <linux/pm.h>
  19
  20 #include <asm/io.h>
  21 #include <asm/irq.h>
  22 #include <asm/reboot.h>
  23 #include <asm/system.h>
  24 #include <asm/sgialib.h>
  25 #include <asm/sn/addrs.h>
  26 #include <asm/sn/arch.h>
  27 #include <asm/sn/gda.h>
  28 #include <asm/sn/sn0/hub.h>
  29
  30 void machine_restart(char *command) __attribute__((noreturn));
  31 void machine_halt(void) __attribute__((noreturn));
  32 void machine_power_off(void) __attribute__((noreturn));
  33
  34 #define noreturn while(1);                              /* Silence gcc.  */
  35
  36 /* XXX How to pass the reboot command to the firmware??? */
  37 static void ip27_machine_restart(char *command)
  38 {
  39 #if 0
  40         int i;
  41 #endif
  42
  43         printk("Reboot started from CPU %d\n", smp_processor_id());
  44 #ifdef CONFIG_SMP
  45         smp_send_stop();
  46 #endif
  47 #if 0
  48         for_each_online_node(i)
  49                 REMOTE_HUB_S(COMPACT_TO_NASID_NODEID(i), PROMOP_REG,
  50                                                         PROMOP_REBOOT);
  51 #else
  52         LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET);
  53 #endif
  54         noreturn;
  55 }
  56
  57 static void ip27_machine_halt(void)
  58 {
  59         int i;
  60
  61 #ifdef CONFIG_SMP
  62         smp_send_stop();
  63 #endif
  64         for_each_online_node(i)
  65                 REMOTE_HUB_S(COMPACT_TO_NASID_NODEID(i), PROMOP_REG,
  66                                                         PROMOP_RESTART);
  67         LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET);
  68         noreturn;
  69 }
  70
  71 static void ip27_machine_power_off(void)
  72 {
  73         /* To do ...  */
  74         noreturn;
  75 }
  76
  77 void ip27_reboot_setup(void)
  78 {
  79         _machine_restart = ip27_machine_restart;
  80         _machine_halt = ip27_machine_halt;
  81         pm_power_off = ip27_machine_power_off;
  82 }