arch/loongarch/kernel/reset.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/acpi.h>
   7 #include <linux/efi.h>
   8 #include <linux/export.h>
   9 #include <linux/pm.h>
  10 #include <linux/types.h>
  11 #include <linux/reboot.h>
  12 #include <linux/delay.h>
  13 #include <linux/console.h>
  14
  15 #include <acpi/reboot.h>
  16 #include <asm/idle.h>
  17 #include <asm/loongarch.h>
  18 #include <asm/reboot.h>
  19
  20 static void default_halt(void)
  21 {
  22         local_irq_disable();
  23         clear_csr_ecfg(ECFG0_IM);
  24
  25         pr_notice("\n\n** You can safely turn off the power now **\n\n");
  26         console_flush_on_panic(CONSOLE_FLUSH_PENDING);
  27
  28         while (true) {
  29                 __arch_cpu_idle();
  30         }
  31 }
  32
  33 static void default_poweroff(void)
  34 {
  35 #ifdef CONFIG_EFI
  36         efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
  37 #endif
  38         while (true) {
  39                 __arch_cpu_idle();
  40         }
  41 }
  42
  43 static void default_restart(void)
  44 {
  45 #ifdef CONFIG_EFI
  46         if (efi_capsule_pending(NULL))
  47                 efi_reboot(REBOOT_WARM, NULL);
  48         else
  49                 efi_reboot(REBOOT_COLD, NULL);
  50 #endif
  51         if (!acpi_disabled)
  52                 acpi_reboot();
  53
  54         while (true) {
  55                 __arch_cpu_idle();
  56         }
  57 }
  58
  59 void (*pm_restart)(void);
  60 EXPORT_SYMBOL(pm_restart);
  61
  62 void (*pm_power_off)(void);
  63 EXPORT_SYMBOL(pm_power_off);
  64
  65 void machine_halt(void)
  66 {
  67 #ifdef CONFIG_SMP
  68         preempt_disable();
  69         smp_send_stop();
  70 #endif
  71         default_halt();
  72 }
  73
  74 void machine_power_off(void)
  75 {
  76 #ifdef CONFIG_SMP
  77         preempt_disable();
  78         smp_send_stop();
  79 #endif
  80         pm_power_off();
  81 }
  82
  83 void machine_restart(char *command)
  84 {
  85 #ifdef CONFIG_SMP
  86         preempt_disable();
  87         smp_send_stop();
  88 #endif
  89         do_kernel_restart(command);
  90         pm_restart();
  91 }
  92
  93 static int __init loongarch_reboot_setup(void)
  94 {
  95         pm_restart = default_restart;
  96         pm_power_off = default_poweroff;
  97
  98         return 0;
  99 }
 100
 101 arch_initcall(loongarch_reboot_setup);