src/interface/efi/efi_pci.c

   1 /*
   2  * Copyright (C) 2008 Michael Brown <mbrown@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 );