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/*
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
*
* Based in part on pci.c from Etherboot 5.4, by Ken Yap and David
* Munro, in turn based on the Linux kernel's PCI implementation.
*
* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <gpxe/tables.h>
#include <gpxe/device.h>
#include <gpxe/pci.h>
/**
* Enable PCI device
*
* @v pci PCI device
*
* Set device to be a busmaster in case BIOS neglected to do so. Also
* adjust PCI latency timer to a reasonable value, 32.
*/
void adjust_pci_device ( struct pci_device *pci ) {
unsigned short new_command, pci_command;
unsigned char pci_latency;
pci_read_config_word ( pci, PCI_COMMAND, &pci_command );
new_command = ( pci_command | PCI_COMMAND_MASTER |
PCI_COMMAND_MEM | PCI_COMMAND_IO );
if ( pci_command != new_command ) {
pci_write_config_word ( pci, PCI_COMMAND, new_command );
}
pci_read_config_byte ( pci, PCI_LATENCY_TIMER, &pci_latency);
if ( pci_latency < 32 ) {
pci_write_config_byte ( pci, PCI_LATENCY_TIMER, 32);
}
}
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