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
  14 void (*pm_power_off)(void);
  15 EXPORT_SYMBOL(pm_power_off);
  16
  17 #ifdef CONFIG_SUPERH32
  18 static void watchdog_trigger_immediate(void)
  19 {
  20         sh_wdt_write_cnt(0xFF);
  21         sh_wdt_write_csr(0xC2);
  22 }
  23 #endif
  24
  25 static 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
  47 static void native_machine_shutdown(void)
  48 {
  49         smp_send_stop();
  50 }
  51
  52 static void native_machine_power_off(void)
  53 {
  54         if (pm_power_off)
  55                 pm_power_off();
  56 }
  57
  58 static 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
  67 struct 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
  77 void machine_power_off(void)
  78 {
  79         machine_ops.power_off();
  80 }
  81
  82 void machine_shutdown(void)
  83 {
  84         machine_ops.shutdown();
  85 }
  86
  87 void machine_restart(char *cmd)
  88 {
  89         machine_ops.restart(cmd);
  90 }
  91
  92 void machine_halt(void)
  93 {
  94         machine_ops.halt();
  95 }
  96
  97 #ifdef CONFIG_KEXEC
  98 void machine_crash_shutdown(struct pt_regs *regs)
  99 {
 100         machine_ops.crash_shutdown(regs);
 101 }
 102 #endif