pci-irq.c
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上传日期:2013-04-10
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- /*
- * Copyright 2002 Momentum Computer Inc.
- * Author: Matthew Dharm <mdharm@momenco.com>
- *
- * Based on work for the Linux port to the Ocelot board, which is
- * Copyright 2001 MontaVista Software Inc.
- * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
- *
- * arch/mips/momentum/ocelot_g/pci.c
- * Board-specific PCI routines for gt64240 controller.
- *
- * 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 (at your
- * option) any later version.
- */
- #include <linux/types.h>
- #include <linux/pci.h>
- #include <linux/kernel.h>
- #include <linux/version.h>
- #include <linux/init.h>
- #include <asm/pci.h>
- void __init gt64240_board_pcibios_fixup_bus(struct pci_bus *bus)
- {
- struct pci_bus *current_bus = bus;
- struct pci_dev *devices;
- struct list_head *devices_link;
- u16 cmd;
- /* loop over all known devices on this bus */
- list_for_each(devices_link, &(current_bus->devices)) {
- devices = pci_dev_b(devices_link);
- if (devices == NULL)
- continue;
- if ((current_bus->number == 0) &&
- PCI_SLOT(devices->devfn) == 1) {
- /* Intel 82543 Gigabit MAC */
- devices->irq = 2; /* irq_nr is 2 for INT0 */
- } else if ((current_bus->number == 0) &&
- PCI_SLOT(devices->devfn) == 2) {
- /* Intel 82543 Gigabit MAC */
- devices->irq = 3; /* irq_nr is 3 for INT1 */
- } else if ((current_bus->number == 1) &&
- PCI_SLOT(devices->devfn) == 3) {
- /* Intel 21555 bridge */
- devices->irq = 5; /* irq_nr is 8 for INT6 */
- } else if ((current_bus->number == 1) &&
- PCI_SLOT(devices->devfn) == 4) {
- /* PMC Slot */
- devices->irq = 9; /* irq_nr is 9 for INT7 */
- } else {
- /* We don't have assign interrupts for other devices. */
- devices->irq = 0xff;
- }
- /* Assign an interrupt number for the device */
- bus->ops->write_byte(devices, PCI_INTERRUPT_LINE, devices->irq);
- /* enable master for everything but the GT-64240 */
- if (((current_bus->number != 0) && (current_bus->number != 1))
- || (PCI_SLOT(devices->devfn) != 0)) {
- bus->ops->read_word(devices, PCI_COMMAND, &cmd);
- cmd |= PCI_COMMAND_MASTER;
- bus->ops->write_word(devices, PCI_COMMAND, cmd);
- }
- }
- }