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[pci] Add generic configuration space backup/restore facility

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Some devices can only be reset via a mechanism that also resets the
card's PCI core, thus necessitating a backup and restore of all or
part of the PCI configuration space across a reset.
This commit is contained in:
Michael Brown 2009-10-14 02:06:01 +01:00
parent c9c411286a
commit 4175b778c2
2 changed files with 123 additions and 0 deletions
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90
src/drivers/bus/pcibackup.c Normal file
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/*
* Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <gpxe/pci.h>
#include <gpxe/pcibackup.h>
/** @file
*
* PCI configuration space backup and restoration
*
*/
/**
* Check PCI configuration space offset against exclusion list
*
* @v pci PCI device
* @v offset Offset within PCI configuration space
* @v exclude PCI configuration space backup exclusion list, or NULL
*/
static int
pci_backup_excluded ( struct pci_device *pci, unsigned int offset,
const uint8_t *exclude ) {
if ( ! exclude )
return 0;
for ( ; *exclude != PCI_CONFIG_BACKUP_EXCLUDE_END ; exclude++ ) {
if ( offset == *exclude ) {
DBGC ( pci, "PCI %p skipping configuration offset "
"%02x\n", pci, offset );
return 1;
}
}
return 0;
}
/**
* Back up PCI configuration space
*
* @v pci PCI device
* @v backup PCI configuration space backup
* @v exclude PCI configuration space backup exclusion list, or NULL
*/
void pci_backup ( struct pci_device *pci, struct pci_config_backup *backup,
const uint8_t *exclude ) {
unsigned int offset;
uint32_t *dword;
for ( offset = 0, dword = backup->dwords ; offset < 0x100 ;
offset += sizeof ( *dword ) , dword++ ) {
if ( ! pci_backup_excluded ( pci, offset, exclude ) )
pci_read_config_dword ( pci, offset, dword );
}
}
/**
* Restore PCI configuration space
*
* @v pci PCI device
* @v backup PCI configuration space backup
* @v exclude PCI configuration space backup exclusion list, or NULL
*/
void pci_restore ( struct pci_device *pci, struct pci_config_backup *backup,
const uint8_t *exclude ) {
unsigned int offset;
uint32_t *dword;
for ( offset = 0, dword = backup->dwords ; offset < 0x100 ;
offset += sizeof ( *dword ) , dword++ ) {
if ( ! pci_backup_excluded ( pci, offset, exclude ) )
pci_write_config_dword ( pci, offset, *dword );
}
}

33
src/include/gpxe/pcibackup.h Normal file
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#ifndef _GPXE_PCIBACKUP_H
#define _GPXE_PCIBACKUP_H
/** @file
*
* PCI configuration space backup and restoration
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
/** A PCI configuration space backup */
struct pci_config_backup {
uint32_t dwords[64];
};
/** PCI configuration space backup exclusion list end marker */
#define PCI_CONFIG_BACKUP_EXCLUDE_END 0xff
/** Define a PCI configuration space backup exclusion list */
#define PCI_CONFIG_BACKUP_EXCLUDE(...) \
{ __VA_ARGS__, PCI_CONFIG_BACKUP_EXCLUDE_END }
extern void pci_backup ( struct pci_device *pci,
struct pci_config_backup *backup,
const uint8_t *exclude );
extern void pci_restore ( struct pci_device *pci,
struct pci_config_backup *backup,
const uint8_t *exclude );
#endif /* _GPXE_PCIBACKUP_H */