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
12void enable_gpe_wakeup(void)
13{
14	if (acpi_disabled)
15	       return;
16
17	if (acpi_gbl_reduced_hardware)
18	       return;
19
20	acpi_hw_enable_all_wakeup_gpes();
21}
22
23void 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
37static struct platform_device loongson3_cpufreq_device = {
38	.name = "loongson3_cpufreq",
39	.id = -1,
40};
41
42static 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
50arch_initcall(loongson_cpufreq_init);
51
52static void default_suspend_addr(void)
53{
54	acpi_enter_sleep_state(ACPI_STATE_S3);
55}
56
57static 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 = (unsigned long)default_suspend_addr;
76	} else {
77		pr_info("ACPI S3 supported with Loongson ACPI SADR extension\n");
78		loongson_sysconf.suspend_addr = (unsigned long)phys_to_virt(PHYSADDR(suspend_addr));
79	}
80#endif
81	return 0;
82}
83
84device_initcall(loongson3_acpi_suspend_init);