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
efipci_address(struct pci_device * pci,unsigned long location)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
efipci_read(struct pci_device * pci,unsigned long location,void * value)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
efipci_write(struct pci_device * pci,unsigned long location,unsigned long value)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