arch/mips64/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 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 <asm/io.h>
  18 #include <asm/irq.h>
  19 #include <asm/system.h>
  20 #include <asm/sgialib.h>
  21 #include <asm/sn/addrs.h>
  22 #include <asm/sn/arch.h>
  23 #include <asm/sn/gda.h>
  24 #include <asm/sn/sn0/hub.h>
  25
  26 void machine_restart(char *command) __attribute__((noreturn));
  27 void machine_halt(void) __attribute__((noreturn));
  28 void machine_power_off(void) __attribute__((noreturn));
  29
  30 #define noreturn while(1);                              /* Silence gcc.  */
  31
  32 /* XXX How to pass the reboot command to the firmware??? */
  33 void machine_restart(char *command)
  34 {
  35 #if 0
  36         int i;
  37 #endif
  38
  39         printk("Reboot started from CPU %d\n", smp_processor_id());
  40 #ifdef CONFIG_SMP
  41         smp_send_stop();
  42 #endif
  43 #if 0
  44         for (i = 0; i < numnodes; i++)
  45                 REMOTE_HUB_S(COMPACT_TO_NASID_NODEID(i), PROMOP_REG,
  46                                                         PROMOP_REBOOT);
  47 #else
  48         LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET);
  49 #endif
  50         noreturn;
  51 }
  52
  53 void machine_halt(void)
  54 {
  55         int i;
  56
  57 #ifdef CONFIG_SMP
  58         smp_send_stop();
  59 #endif
  60         for (i = 0; i < numnodes; i++)
  61                 REMOTE_HUB_S(COMPACT_TO_NASID_NODEID(i), PROMOP_REG,
  62                                                         PROMOP_RESTART);
  63         LOCAL_HUB_S(NI_PORT_RESET, NPR_PORTRESET | NPR_LOCALRESET);
  64         noreturn;
  65 }
  66
  67 void machine_power_off(void)
  68 {
  69         /* To do ...  */
  70         noreturn;
  71 }
  72
  73 void ip27_reboot_setup(void)
  74 {
  75         /* Nothing to do on IP27.  */
  76 }