/arch/frv/mb93090-mb00/pci-irq.c

 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/config.h>
 9#include <linux/types.h>
10#include <linux/kernel.h>
11#include <linux/pci.h>
12#include <linux/init.h>
13#include <linux/slab.h>
14#include <linux/interrupt.h>
15#include <linux/irq.h>
16
17#include <asm/io.h>
18#include <asm/smp.h>
19#include <asm/irq-routing.h>
20
21#include "pci-frv.h"
22
23/*
24 *	DEVICE	DEVNO	INT#A	INT#B	INT#C	INT#D
25 *	=======	=======	=======	=======	=======	=======
26 *	MB86943	0	fpga.10	-	-	-
27 *	RTL8029	16	fpga.12	-	-	-
28 *	SLOT 1	19	fpga.6	fpga.5	fpga.4	fpga.3
29 *	SLOT 2	18	fpga.5	fpga.4	fpga.3	fpga.6
30 *	SLOT 3	17	fpga.4	fpga.3	fpga.6	fpga.5
31 *
32 */
33
34static const uint8_t __initdata pci_bus0_irq_routing[32][4] = {
35	[0 ] {	IRQ_FPGA_MB86943_PCI_INTA },
36	[16] {	IRQ_FPGA_RTL8029_INTA },
37	[17] {	IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB },
38	[18] {	IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD, IRQ_FPGA_PCI_INTA },
39	[19] {	IRQ_FPGA_PCI_INTA, IRQ_FPGA_PCI_INTB, IRQ_FPGA_PCI_INTC, IRQ_FPGA_PCI_INTD },
40};
41
42void __init pcibios_irq_init(void)
43{
44}
45
46void __init pcibios_fixup_irqs(void)
47{
48	struct pci_dev *dev = NULL;
49	uint8_t line, pin;
50
51	while (dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev),
52	       dev != NULL
53	       ) {
54		pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
55		if (pin) {
56			dev->irq = pci_bus0_irq_routing[PCI_SLOT(dev->devfn)][pin - 1];
57			pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
58		}
59		pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &line);
60	}
61}
62
63void __init pcibios_penalize_isa_irq(int irq)
64{
65}
66
67void pcibios_enable_irq(struct pci_dev *dev)
68{
69	pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
70}