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/loongson.h>
  19
  20 void (*pm_power_off)(void);
  21 EXPORT_SYMBOL(pm_power_off);
  22
  23 void machine_halt(void)
  24 {
  25 #ifdef CONFIG_SMP
  26         preempt_disable();
  27         smp_send_stop();
  28 #endif
  29         local_irq_disable();
  30         clear_csr_ecfg(ECFG0_IM);
  31
  32         pr_notice("\n\n** You can safely turn off the power now **\n\n");
  33         console_flush_on_panic(CONSOLE_FLUSH_PENDING);
  34
  35         while (true) {
  36                 __arch_cpu_idle();
  37         }
  38 }
  39
  40 void machine_power_off(void)
  41 {
  42 #ifdef CONFIG_SMP
  43         preempt_disable();
  44         smp_send_stop();
  45 #endif
  46 #ifdef CONFIG_PM
  47         if (!acpi_disabled)
  48                 enable_pci_wakeup();
  49 #endif
  50         do_kernel_power_off();
  51 #ifdef CONFIG_EFI
  52         efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
  53 #endif
  54
  55         while (true) {
  56                 __arch_cpu_idle();
  57         }
  58 }
  59
  60 void machine_restart(char *command)
  61 {
  62 #ifdef CONFIG_SMP
  63         preempt_disable();
  64         smp_send_stop();
  65 #endif
  66         do_kernel_restart(command);
  67 #ifdef CONFIG_EFI
  68         if (efi_capsule_pending(NULL))
  69                 efi_reboot(REBOOT_WARM, NULL);
  70         else
  71                 efi_reboot(REBOOT_COLD, NULL);
  72 #endif
  73         if (!acpi_disabled)
  74                 acpi_reboot();
  75
  76         while (true) {
  77                 __arch_cpu_idle();
  78         }
  79 }