arch/loongarch/power/platform.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author: Huacai Chen <chenhuacai@loongson.cn>
   4  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
   5  */
   6 #include <linux/acpi.h>
   7 #include <linux/platform_device.h>
   8
   9 #include <asm/bootinfo.h>
  10 #include <asm/loongson.h>
  11
  12 void enable_gpe_wakeup(void)
  13 {
  14         if (acpi_disabled)
  15                return;
  16
  17         if (acpi_gbl_reduced_hardware)
  18                return;
  19
  20         acpi_enable_all_wakeup_gpes();
  21 }
  22
  23 void enable_pci_wakeup(void)
  24 {
  25         if (acpi_disabled)
  26                return;
  27
  28         if (acpi_gbl_reduced_hardware)
  29                return;
  30
  31         acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_STATUS, 1);
  32
  33         if (acpi_gbl_FADT.flags & ACPI_FADT_PCI_EXPRESS_WAKE)
  34                 acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_DISABLE, 0);
  35 }
  36
  37 static int __init loongson3_acpi_suspend_init(void)
  38 {
  39 #ifdef CONFIG_ACPI
  40         acpi_status status;
  41         uint64_t suspend_addr = 0;
  42
  43         if (acpi_disabled || acpi_gbl_reduced_hardware)
  44                 return 0;
  45
  46         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
  47         status = acpi_evaluate_integer(NULL, "\\SADR", NULL, &suspend_addr);
  48         if (ACPI_FAILURE(status) || !suspend_addr) {
  49                 pr_err("ACPI S3 is not support!\n");
  50                 return -1;
  51         }
  52         loongson_sysconf.suspend_addr = (u64)phys_to_virt(PHYSADDR(suspend_addr));
  53 #endif
  54         return 0;
  55 }
  56
  57 device_initcall(loongson3_acpi_suspend_init);