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