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
  19 void (*pm_power_off)(void);
  20 EXPORT_SYMBOL(pm_power_off);
  21
  22 void machine_halt(void)
  23 {
  24 #ifdef CONFIG_SMP
  25         preempt_disable();
  26         smp_send_stop();
  27 #endif
  28         local_irq_disable();
  29         clear_csr_ecfg(ECFG0_IM);
  30
  31         pr_notice("\n\n** You can safely turn off the power now **\n\n");
  32         console_flush_on_panic(CONSOLE_FLUSH_PENDING);
  33
  34         while (true) {
  35                 __arch_cpu_idle();
  36         }
  37 }
  38
  39 void machine_power_off(void)
  40 {
  41 #ifdef CONFIG_SMP
  42         preempt_disable();
  43         smp_send_stop();
  44 #endif
  45         do_kernel_power_off();
  46 #ifdef CONFIG_EFI
  47         efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
  48 #endif
  49
  50         while (true) {
  51                 __arch_cpu_idle();
  52         }
  53 }
  54
  55 void machine_restart(char *command)
  56 {
  57 #ifdef CONFIG_SMP
  58         preempt_disable();
  59         smp_send_stop();
  60 #endif
  61         do_kernel_restart(command);
  62 #ifdef CONFIG_EFI
  63         if (efi_capsule_pending(NULL))
  64                 efi_reboot(REBOOT_WARM, NULL);
  65         else
  66                 efi_reboot(REBOOT_COLD, NULL);
  67 #endif
  68         if (!acpi_disabled)
  69                 acpi_reboot();
  70
  71         while (true) {
  72                 __arch_cpu_idle();
  73         }
  74 }