1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
4  *
5  * Generic reset driver for x86 processor
6  */
7 
8 #include <common.h>
9 #include <dm.h>
10 #include <sysreset.h>
11 #include <asm/io.h>
12 #include <asm/processor.h>
13 #include <efi_loader.h>
14 
x86_sysreset_request(struct udevice * dev,enum sysreset_t type)15 static __efi_runtime int x86_sysreset_request(struct udevice *dev,
16 					      enum sysreset_t type)
17 {
18 	int value;
19 
20 	switch (type) {
21 	case SYSRESET_WARM:
22 		value = SYS_RST | RST_CPU;
23 		break;
24 	case SYSRESET_COLD:
25 		value = SYS_RST | RST_CPU | FULL_RST;
26 		break;
27 	default:
28 		return -ENOSYS;
29 	}
30 
31 	outb(value, IO_PORT_RESET);
32 
33 	return -EINPROGRESS;
34 }
35 
36 #ifdef CONFIG_EFI_LOADER
efi_reset_system(enum efi_reset_type reset_type,efi_status_t reset_status,unsigned long data_size,void * reset_data)37 void __efi_runtime EFIAPI efi_reset_system(
38 			enum efi_reset_type reset_type,
39 			efi_status_t reset_status,
40 			unsigned long data_size, void *reset_data)
41 {
42 	if (reset_type == EFI_RESET_COLD ||
43 		 reset_type == EFI_RESET_PLATFORM_SPECIFIC)
44 		x86_sysreset_request(NULL, SYSRESET_COLD);
45 	else if (reset_type == EFI_RESET_WARM)
46 		x86_sysreset_request(NULL, SYSRESET_WARM);
47 
48 	/* TODO EFI_RESET_SHUTDOWN */
49 
50 	while (1) { }
51 }
52 #endif
53 
54 
55 static const struct udevice_id x86_sysreset_ids[] = {
56 	{ .compatible = "x86,reset" },
57 	{ }
58 };
59 
60 static struct sysreset_ops x86_sysreset_ops = {
61 	.request = x86_sysreset_request,
62 };
63 
64 U_BOOT_DRIVER(x86_sysreset) = {
65 	.name = "x86-sysreset",
66 	.id = UCLASS_SYSRESET,
67 	.of_match = x86_sysreset_ids,
68 	.ops = &x86_sysreset_ops,
69 };
70