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); 58