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 struct platform_device loongson3_cpufreq_device = {
  38         .name = "loongson3_cpufreq",
  39         .id = -1,
  40 };
  41
  42 static int __init loongson_cpufreq_init(void)
  43 {
  44         if (!cpu_has_scalefreq)
  45                 return -ENODEV;
  46
  47         return platform_device_register(&loongson3_cpufreq_device);
  48 }
  49
  50 arch_initcall(loongson_cpufreq_init);
  51
  52 static void default_suspend_addr(void)
  53 {
  54         acpi_enter_sleep_state(ACPI_STATE_S3);
  55 }
  56
  57 static int __init loongson3_acpi_suspend_init(void)
  58 {
  59 #ifdef CONFIG_ACPI
  60         acpi_status status;
  61         uint64_t suspend_addr = 0;
  62
  63         if (acpi_disabled)
  64                 return 0;
  65
  66         if (!acpi_gbl_reduced_hardware)
  67                 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
  68
  69         if (!acpi_sleep_state_supported(ACPI_STATE_S3))
  70                 return 0;
  71
  72         status = acpi_evaluate_integer(NULL, "\\SADR", NULL, &suspend_addr);
  73         if (ACPI_FAILURE(status) || !suspend_addr) {
  74                 pr_info("ACPI S3 supported with hardware register default\n");
  75                 loongson_sysconf.suspend_addr = (u64)default_suspend_addr;
  76         } else {
  77                 pr_info("ACPI S3 supported with Loongson ACPI SADR extension\n");
  78                 loongson_sysconf.suspend_addr = (u64)phys_to_virt(PHYSADDR(suspend_addr));
  79         }
  80 #endif
  81         return 0;
  82 }
  83
  84 device_initcall(loongson3_acpi_suspend_init);