1 /* 2 * Copyright (C) 2008 Michael Brown <mbrown (at) fensystems.co.uk>. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 of the 7 * License, or any later version. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 17 */ 18 19 FILE_LICENCE ( GPL2_OR_LATER ); 20 21 #include <errno.h> 22 #include <gpxe/pci.h> 23 #include <gpxe/efi/efi.h> 24 #include <gpxe/efi/Protocol/PciRootBridgeIo.h> 25 26 /** @file 27 * 28 * gPXE PCI I/O API for EFI 29 * 30 */ 31 32 /** PCI root bridge I/O protocol */ 33 static EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *efipci; 34 EFI_REQUIRE_PROTOCOL ( EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL, &efipci ); 35 36 static unsigned long efipci_address ( struct pci_device *pci, 37 unsigned long location ) { 38 return EFI_PCI_ADDRESS ( pci->bus, PCI_SLOT ( pci->devfn ), 39 PCI_FUNC ( pci->devfn ), 40 EFIPCI_OFFSET ( location ) ); 41 } 42 43 int efipci_read ( struct pci_device *pci, unsigned long location, 44 void *value ) { 45 EFI_STATUS efirc; 46 47 if ( ( efirc = efipci->Pci.Read ( efipci, EFIPCI_WIDTH ( location ), 48 efipci_address ( pci, location ), 1, 49 value ) ) != 0 ) { 50 DBG ( "EFIPCI config read from %02x:%02x.%x offset %02lx " 51 "failed: %s\n", pci->bus, PCI_SLOT ( pci->devfn ), 52 PCI_FUNC ( pci->devfn ), EFIPCI_OFFSET ( location ), 53 efi_strerror ( efirc ) ); 54 return -EIO; 55 } 56 57 return 0; 58 } 59 60 int efipci_write ( struct pci_device *pci, unsigned long location, 61 unsigned long value ) { 62 EFI_STATUS efirc; 63 64 if ( ( efirc = efipci->Pci.Write ( efipci, EFIPCI_WIDTH ( location ), 65 efipci_address ( pci, location ), 1, 66 &value ) ) != 0 ) { 67 DBG ( "EFIPCI config write to %02x:%02x.%x offset %02lx " 68 "failed: %s\n", pci->bus, PCI_SLOT ( pci->devfn ), 69 PCI_FUNC ( pci->devfn ), EFIPCI_OFFSET ( location ), 70 efi_strerror ( efirc ) ); 71 return -EIO; 72 } 73 74 return 0; 75 } 76 77 PROVIDE_PCIAPI_INLINE ( efi, pci_max_bus ); 78 PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_byte ); 79 PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_word ); 80 PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_dword ); 81 PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_byte ); 82 PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_word ); 83 PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_dword ); 84
