362 lines
10 KiB
C
362 lines
10 KiB
C
/*
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* Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdlib.h>
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#include <errno.h>
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#include <ipxe/pci.h>
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#include <ipxe/efi/efi.h>
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#include <ipxe/efi/efi_pci.h>
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#include <ipxe/efi/efi_driver.h>
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#include <ipxe/efi/Protocol/PciIo.h>
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#include <ipxe/efi/Protocol/PciRootBridgeIo.h>
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/** @file
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*
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* iPXE PCI I/O API for EFI
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*
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*/
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/* Disambiguate the various error causes */
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#define EINFO_EEFI_PCI \
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__einfo_uniqify ( EINFO_EPLATFORM, 0x01, \
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"Could not open PCI I/O protocol" )
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#define EINFO_EEFI_PCI_NOT_PCI \
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__einfo_platformify ( EINFO_EEFI_PCI, EFI_UNSUPPORTED, \
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"Not a PCI device" )
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#define EEFI_PCI_NOT_PCI __einfo_error ( EINFO_EEFI_PCI_NOT_PCI )
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#define EINFO_EEFI_PCI_IN_USE \
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__einfo_platformify ( EINFO_EEFI_PCI, EFI_ACCESS_DENIED, \
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"PCI device already has a driver" )
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#define EEFI_PCI_IN_USE __einfo_error ( EINFO_EEFI_PCI_IN_USE )
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#define EEFI_PCI( efirc ) \
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EPLATFORM ( EINFO_EEFI_PCI, efirc, \
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EEFI_PCI_NOT_PCI, EEFI_PCI_IN_USE )
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/******************************************************************************
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*
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* iPXE PCI API
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*
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******************************************************************************
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*/
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/** PCI root bridge I/O protocol */
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static EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *efipci;
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EFI_REQUEST_PROTOCOL ( EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL, &efipci );
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static unsigned long efipci_address ( struct pci_device *pci,
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unsigned long location ) {
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return EFI_PCI_ADDRESS ( PCI_BUS ( pci->busdevfn ),
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PCI_SLOT ( pci->busdevfn ),
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PCI_FUNC ( pci->busdevfn ),
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EFIPCI_OFFSET ( location ) );
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}
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int efipci_read ( struct pci_device *pci, unsigned long location,
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void *value ) {
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EFI_STATUS efirc;
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int rc;
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if ( ! efipci )
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return -ENOTSUP;
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if ( ( efirc = efipci->Pci.Read ( efipci, EFIPCI_WIDTH ( location ),
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efipci_address ( pci, location ), 1,
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value ) ) != 0 ) {
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rc = -EEFI ( efirc );
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DBG ( "EFIPCI config read from " PCI_FMT " offset %02lx "
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"failed: %s\n", PCI_ARGS ( pci ),
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EFIPCI_OFFSET ( location ), strerror ( rc ) );
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return -EIO;
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}
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return 0;
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}
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int efipci_write ( struct pci_device *pci, unsigned long location,
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unsigned long value ) {
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EFI_STATUS efirc;
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int rc;
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if ( ! efipci )
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return -ENOTSUP;
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if ( ( efirc = efipci->Pci.Write ( efipci, EFIPCI_WIDTH ( location ),
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efipci_address ( pci, location ), 1,
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&value ) ) != 0 ) {
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rc = -EEFI ( efirc );
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DBG ( "EFIPCI config write to " PCI_FMT " offset %02lx "
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"failed: %s\n", PCI_ARGS ( pci ),
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EFIPCI_OFFSET ( location ), strerror ( rc ) );
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return -EIO;
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}
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return 0;
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}
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PROVIDE_PCIAPI_INLINE ( efi, pci_num_bus );
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PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_byte );
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PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_word );
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PROVIDE_PCIAPI_INLINE ( efi, pci_read_config_dword );
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PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_byte );
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PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_word );
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PROVIDE_PCIAPI_INLINE ( efi, pci_write_config_dword );
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/******************************************************************************
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*
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* EFI PCI device instantiation
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*
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******************************************************************************
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*/
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/**
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* Open EFI PCI device
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*
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* @v device EFI device handle
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* @v attributes Protocol opening attributes
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* @v pci PCI device to fill in
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* @ret rc Return status code
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*/
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int efipci_open ( EFI_HANDLE device, UINT32 attributes,
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struct pci_device *pci ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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union {
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EFI_PCI_IO_PROTOCOL *pci_io;
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void *interface;
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} pci_io;
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UINTN pci_segment, pci_bus, pci_dev, pci_fn;
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EFI_STATUS efirc;
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int rc;
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/* See if device is a PCI device */
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if ( ( efirc = bs->OpenProtocol ( device, &efi_pci_io_protocol_guid,
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&pci_io.interface, efi_image_handle,
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device, attributes ) ) != 0 ) {
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rc = -EEFI_PCI ( efirc );
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DBGCP ( device, "EFIPCI %p %s cannot open PCI protocols: %s\n",
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device, efi_handle_name ( device ), strerror ( rc ) );
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goto err_open_protocol;
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}
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/* Get PCI bus:dev.fn address */
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if ( ( efirc = pci_io.pci_io->GetLocation ( pci_io.pci_io, &pci_segment,
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&pci_bus, &pci_dev,
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&pci_fn ) ) != 0 ) {
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rc = -EEFI ( efirc );
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DBGC ( device, "EFIPCI %p %s could not get PCI location: %s\n",
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device, efi_handle_name ( device ), strerror ( rc ) );
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goto err_get_location;
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}
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DBGC2 ( device, "EFIPCI %p %s is PCI %04lx:%02lx:%02lx.%lx\n", device,
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efi_handle_name ( device ), ( ( unsigned long ) pci_segment ),
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( ( unsigned long ) pci_bus ), ( ( unsigned long ) pci_dev ),
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( ( unsigned long ) pci_fn ) );
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/* Try to enable I/O cycles, memory cycles, and bus mastering.
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* Some platforms will 'helpfully' report errors if these bits
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* can't be enabled (for example, if the card doesn't actually
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* support I/O cycles). Work around any such platforms by
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* enabling bits individually and simply ignoring any errors.
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*/
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pci_io.pci_io->Attributes ( pci_io.pci_io,
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EfiPciIoAttributeOperationEnable,
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EFI_PCI_IO_ATTRIBUTE_IO, NULL );
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pci_io.pci_io->Attributes ( pci_io.pci_io,
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EfiPciIoAttributeOperationEnable,
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EFI_PCI_IO_ATTRIBUTE_MEMORY, NULL );
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pci_io.pci_io->Attributes ( pci_io.pci_io,
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EfiPciIoAttributeOperationEnable,
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EFI_PCI_IO_ATTRIBUTE_BUS_MASTER, NULL );
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/* Populate PCI device */
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pci_init ( pci, PCI_BUSDEVFN ( pci_bus, pci_dev, pci_fn ) );
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if ( ( rc = pci_read_config ( pci ) ) != 0 ) {
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DBGC ( device, "EFIPCI %p %s cannot read PCI configuration: "
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"%s\n", device, efi_handle_name ( device ),
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strerror ( rc ) );
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goto err_pci_read_config;
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}
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return 0;
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err_pci_read_config:
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err_get_location:
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bs->CloseProtocol ( device, &efi_pci_io_protocol_guid,
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efi_image_handle, device );
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err_open_protocol:
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return rc;
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}
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/**
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* Close EFI PCI device
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*
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* @v device EFI device handle
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*/
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void efipci_close ( EFI_HANDLE device ) {
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EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
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bs->CloseProtocol ( device, &efi_pci_io_protocol_guid,
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efi_image_handle, device );
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}
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/**
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* Get EFI PCI device information
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*
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* @v device EFI device handle
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* @v pci PCI device to fill in
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* @ret rc Return status code
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*/
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int efipci_info ( EFI_HANDLE device, struct pci_device *pci ) {
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int rc;
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/* Open PCI device, if possible */
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if ( ( rc = efipci_open ( device, EFI_OPEN_PROTOCOL_GET_PROTOCOL,
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pci ) ) != 0 )
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return rc;
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/* Close PCI device */
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efipci_close ( device );
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return 0;
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}
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/******************************************************************************
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*
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* EFI PCI driver
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*
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******************************************************************************
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*/
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/**
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* Check to see if driver supports a device
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*
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* @v device EFI device handle
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* @ret rc Return status code
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*/
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static int efipci_supported ( EFI_HANDLE device ) {
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struct pci_device pci;
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int rc;
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/* Get PCI device information */
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if ( ( rc = efipci_info ( device, &pci ) ) != 0 )
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return rc;
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/* Look for a driver */
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if ( ( rc = pci_find_driver ( &pci ) ) != 0 ) {
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DBGCP ( device, "EFIPCI %p %s has no driver\n",
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device, efi_handle_name ( device ) );
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return rc;
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}
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DBGC ( device, "EFIPCI %p %s has driver \"%s\"\n",
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device, efi_handle_name ( device ), pci.id->name );
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return 0;
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}
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/**
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* Attach driver to device
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*
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* @v efidev EFI device
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* @ret rc Return status code
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*/
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static int efipci_start ( struct efi_device *efidev ) {
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EFI_HANDLE device = efidev->device;
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struct pci_device *pci;
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int rc;
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/* Allocate PCI device */
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pci = zalloc ( sizeof ( *pci ) );
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if ( ! pci ) {
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rc = -ENOMEM;
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goto err_alloc;
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}
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/* Open PCI device */
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if ( ( rc = efipci_open ( device, ( EFI_OPEN_PROTOCOL_BY_DRIVER |
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EFI_OPEN_PROTOCOL_EXCLUSIVE ),
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pci ) ) != 0 ) {
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DBGC ( device, "EFIPCI %p %s could not open PCI device: %s\n",
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device, efi_handle_name ( device ), strerror ( rc ) );
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DBGC_EFI_OPENERS ( device, device, &efi_pci_io_protocol_guid );
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goto err_open;
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}
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/* Find driver */
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if ( ( rc = pci_find_driver ( pci ) ) != 0 ) {
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DBGC ( device, "EFIPCI %p %s has no driver\n",
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device, efi_handle_name ( device ) );
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goto err_find_driver;
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}
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/* Mark PCI device as a child of the EFI device */
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pci->dev.parent = &efidev->dev;
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list_add ( &pci->dev.siblings, &efidev->dev.children );
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/* Probe driver */
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if ( ( rc = pci_probe ( pci ) ) != 0 ) {
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DBGC ( device, "EFIPCI %p %s could not probe driver \"%s\": "
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"%s\n", device, efi_handle_name ( device ),
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pci->id->name, strerror ( rc ) );
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goto err_probe;
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}
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DBGC ( device, "EFIPCI %p %s using driver \"%s\"\n",
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device, efi_handle_name ( device ), pci->id->name );
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efidev_set_drvdata ( efidev, pci );
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return 0;
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pci_remove ( pci );
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err_probe:
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list_del ( &pci->dev.siblings );
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err_find_driver:
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efipci_close ( device );
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err_open:
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free ( pci );
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err_alloc:
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return rc;
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}
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/**
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* Detach driver from device
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*
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* @v efidev EFI device
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*/
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static void efipci_stop ( struct efi_device *efidev ) {
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struct pci_device *pci = efidev_get_drvdata ( efidev );
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EFI_HANDLE device = efidev->device;
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pci_remove ( pci );
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list_del ( &pci->dev.siblings );
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efipci_close ( device );
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free ( pci );
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}
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/** EFI PCI driver */
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struct efi_driver efipci_driver __efi_driver ( EFI_DRIVER_NORMAL ) = {
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.name = "PCI",
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.supported = efipci_supported,
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.start = efipci_start,
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.stop = efipci_stop,
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};
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