1/* pci-irq.c: PCI IRQ routing on the FRV motherboard
2 *
3 * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * derived from: arch/i386/kernel/pci-irq.c: (c) 1999--2000 Martin Mares <mj@suse.cz>
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/pci.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/irq.h>
14
15#include <asm/io.h>
16#include <asm/smp.h>
17
18#include "pci-frv.h"
19
20/*
21 *	DEVICE	DEVNO	INT#A	INT#B	INT#C	INT#D
22 *	=======	=======	=======	=======	=======	=======
23 *	MB86943	0	fpga.10	-	-	-
24 *	RTL8029	16	fpga.12	-	-	-
25 *	SLOT 1	19	fpga.6	fpga.5	fpga.4	fpga.3
26 *	SLOT 2	18	fpga.5	fpga.4	fpga.3	fpga.6
27 *	SLOT 3	17	fpga.4	fpga.3	fpga.6	fpga.5
28 *
29 */
30
31static const uint8_t __initconst pci_bus0_irq_routing[32][4] = {
32	[0 ] = { IRQ_FPGA_MB86943_PCI_INTA },
33	[16] = { IRQ_FPGA_RTL8029_INTA },
34	[17] = { IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB },
35	[18] = { IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA },
36	[19] = { IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD },
37};
38
39void __init pcibios_irq_init(void)
40{
41}
42
43void __init pcibios_fixup_irqs(void)
44{
45	struct pci_dev *dev = NULL;
46	uint8_t line, pin;
47
48	for_each_pci_dev(dev) {
49		pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
50		if (pin) {
51			dev->irq = pci_bus0_irq_routing[PCI_SLOT(dev->devfn)][pin - 1];
52			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
53		}
54		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
55	}
56}
57
58void pcibios_enable_irq(struct pci_dev *dev)
59{
60	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
61}
62