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