arch/sh/kernel/reboot.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/pm.h>
   3 #include <linux/kexec.h>
   4 #include <linux/kernel.h>
   5 #include <linux/reboot.h>
   6 #include <linux/module.h>
   7 #include <asm/watchdog.h>
   8 #include <asm/addrspace.h>
   9 #include <asm/reboot.h>
  10 #include <asm/tlbflush.h>
  11 #include <asm/traps.h>
  12
  13 void (*pm_power_off)(void);
  14 EXPORT_SYMBOL(pm_power_off);
  15
  16 static void watchdog_trigger_immediate(void)
  17 {
  18         sh_wdt_write_cnt(0xFF);
  19         sh_wdt_write_csr(0xC2);
  20 }
  21
  22 static void native_machine_restart(char * __unused)
  23 {
  24         local_irq_disable();
  25
  26         /* Destroy all of the TLBs in preparation for reset by MMU */
  27         __flush_tlb_global();
  28
  29         /* Address error with SR.BL=1 first. */
  30         trigger_address_error();
  31
  32         /* If that fails or is unsupported, go for the watchdog next. */
  33         watchdog_trigger_immediate();
  34
  35         /*
  36          * Give up and sleep.
  37          */
  38         while (1)
  39                 cpu_sleep();
  40 }
  41
  42 static void native_machine_shutdown(void)
  43 {
  44         smp_send_stop();
  45 }
  46
  47 static void native_machine_power_off(void)
  48 {
  49         do_kernel_power_off();
  50 }
  51
  52 static void native_machine_halt(void)
  53 {
  54         /* stop other cpus */
  55         machine_shutdown();
  56
  57         /* stop this cpu */
  58         stop_this_cpu(NULL);
  59 }
  60
  61 struct machine_ops machine_ops = {
  62         .power_off      = native_machine_power_off,
  63         .shutdown       = native_machine_shutdown,
  64         .restart        = native_machine_restart,
  65         .halt           = native_machine_halt,
  66 #ifdef CONFIG_KEXEC_CORE
  67         .crash_shutdown = native_machine_crash_shutdown,
  68 #endif
  69 };
  70
  71 void machine_power_off(void)
  72 {
  73         machine_ops.power_off();
  74 }
  75
  76 void machine_shutdown(void)
  77 {
  78         machine_ops.shutdown();
  79 }
  80
  81 void machine_restart(char *cmd)
  82 {
  83         machine_ops.restart(cmd);
  84 }
  85
  86 void machine_halt(void)
  87 {
  88         machine_ops.halt();
  89 }
  90
  91 #ifdef CONFIG_KEXEC_CORE
  92 void machine_crash_shutdown(struct pt_regs *regs)
  93 {
  94         machine_ops.crash_shutdown(regs);
  95 }
  96 #endif