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 
enable_gpe_wakeup(void)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 
enable_pci_wakeup(void)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 
loongson_cpufreq_init(void)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 
default_suspend_addr(void)52 static void default_suspend_addr(void)
53 {
54 	acpi_enter_sleep_state(ACPI_STATE_S3);
55 }
56 
loongson3_acpi_suspend_init(void)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);
85