LXR linux/arch/sh/kernel/reboot.c

   1#include <linux/pm.h>
   2#include <linux/kexec.h>
   3#include <linux/kernel.h>
   4#include <linux/reboot.h>
   5#include <linux/module.h>
   6#ifdef CONFIG_SUPERH32
   7#include <asm/watchdog.h>
   8#endif
   9#include <asm/addrspace.h>
  10#include <asm/reboot.h>
  11#include <asm/tlbflush.h>
  12#include <asm/traps.h>
  13
  14void (*pm_power_off)(void);
  15EXPORT_SYMBOL(pm_power_off);
  16
  17#ifdef CONFIG_SUPERH32
  18static void watchdog_trigger_immediate(void)
  19{
  20        sh_wdt_write_cnt(0xFF);
  21        sh_wdt_write_csr(0xC2);
  22}
  23#endif
  24
  25static void native_machine_restart(char * __unused)
  26{
  27        local_irq_disable();
  28
  29        /* Destroy all of the TLBs in preparation for reset by MMU */
  30        __flush_tlb_global();
  31
  32        /* Address error with SR.BL=1 first. */
  33        trigger_address_error();
  34
  35#ifdef CONFIG_SUPERH32
  36        /* If that fails or is unsupported, go for the watchdog next. */
  37        watchdog_trigger_immediate();
  38#endif
  39
  40        /*
  41         * Give up and sleep.
  42         */
  43        while (1)
  44                cpu_sleep();
  45}
  46
  47static void native_machine_shutdown(void)
  48{
  49        smp_send_stop();
  50}
  51
  52static void native_machine_power_off(void)
  53{
  54        if (pm_power_off)
  55                pm_power_off();
  56}
  57
  58static void native_machine_halt(void)
  59{
  60        /* stop other cpus */
  61        machine_shutdown();
  62
  63        /* stop this cpu */
  64        stop_this_cpu(NULL);
  65}
  66
  67struct machine_ops machine_ops = {
  68        .power_off      = native_machine_power_off,
  69        .shutdown       = native_machine_shutdown,
  70        .restart        = native_machine_restart,
  71        .halt           = native_machine_halt,
  72#ifdef CONFIG_KEXEC
  73        .crash_shutdown = native_machine_crash_shutdown,
  74#endif
  75};
  76
  77void machine_power_off(void)
  78{
  79        machine_ops.power_off();
  80}
  81
  82void machine_shutdown(void)
  83{
  84        machine_ops.shutdown();
  85}
  86
  87void machine_restart(char *cmd)
  88{
  89        machine_ops.restart(cmd);
  90}
  91
  92void machine_halt(void)
  93{
  94        machine_ops.halt();
  95}
  96
  97#ifdef CONFIG_KEXEC
  98void machine_crash_shutdown(struct pt_regs *regs)
  99{
 100        machine_ops.crash_shutdown(regs);
 101}
 102#endif
 103