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1da177e4 LT |
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 | ||
1da177e4 LT |
8 | #include <linux/types.h> |
9 | #include <linux/kernel.h> | |
10 | #include <linux/pci.h> | |
11 | #include <linux/init.h> | |
1da177e4 LT |
12 | #include <linux/interrupt.h> |
13 | #include <linux/irq.h> | |
14 | ||
15 | #include <asm/io.h> | |
16 | #include <asm/smp.h> | |
1da177e4 LT |
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 | ||
3f3247d0 | 31 | static const uint8_t __initconst pci_bus0_irq_routing[32][4] = { |
576132b4 AV |
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 }, | |
1da177e4 LT |
37 | }; |
38 | ||
39 | void __init pcibios_irq_init(void) | |
40 | { | |
41 | } | |
42 | ||
43 | void __init pcibios_fixup_irqs(void) | |
44 | { | |
45 | struct pci_dev *dev = NULL; | |
46 | uint8_t line, pin; | |
47 | ||
3c94792f | 48 | for_each_pci_dev(dev) { |
1da177e4 LT |
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 | ||
1da177e4 LT |
58 | void pcibios_enable_irq(struct pci_dev *dev) |
59 | { | |
60 | pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); | |
61 | } |