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 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 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