| 1 | /* |
| 2 | * arch/arch/mach-ixp4xx/fsg-pci.c |
| 3 | * |
| 4 | * FSG board-level PCI initialization |
| 5 | * |
| 6 | * Author: Rod Whitby <rod@whitby.id.au> |
| 7 | * Maintainer: http://www.nslu2-linux.org/ |
| 8 | * |
| 9 | * based on ixdp425-pci.c: |
| 10 | * Copyright (C) 2002 Intel Corporation. |
| 11 | * Copyright (C) 2003-2004 MontaVista Software, Inc. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License version 2 as |
| 15 | * published by the Free Software Foundation. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/pci.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/irq.h> |
| 22 | #include <asm/mach/pci.h> |
| 23 | #include <asm/mach-types.h> |
| 24 | |
| 25 | #define MAX_DEV 3 |
| 26 | #define IRQ_LINES 3 |
| 27 | |
| 28 | /* PCI controller GPIO to IRQ pin mappings */ |
| 29 | #define INTA 6 |
| 30 | #define INTB 7 |
| 31 | #define INTC 5 |
| 32 | |
| 33 | void __init fsg_pci_preinit(void) |
| 34 | { |
| 35 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW); |
| 36 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW); |
| 37 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW); |
| 38 | ixp4xx_pci_preinit(); |
| 39 | } |
| 40 | |
| 41 | static int __init fsg_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
| 42 | { |
| 43 | static int pci_irq_table[IRQ_LINES] = { |
| 44 | IXP4XX_GPIO_IRQ(INTC), |
| 45 | IXP4XX_GPIO_IRQ(INTB), |
| 46 | IXP4XX_GPIO_IRQ(INTA), |
| 47 | }; |
| 48 | |
| 49 | int irq = -1; |
| 50 | slot -= 11; |
| 51 | |
| 52 | if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES) |
| 53 | irq = pci_irq_table[slot - 1]; |
| 54 | printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n", |
| 55 | __func__, slot, pin, irq); |
| 56 | |
| 57 | return irq; |
| 58 | } |
| 59 | |
| 60 | struct hw_pci fsg_pci __initdata = { |
| 61 | .nr_controllers = 1, |
| 62 | .ops = &ixp4xx_ops, |
| 63 | .preinit = fsg_pci_preinit, |
| 64 | .setup = ixp4xx_setup, |
| 65 | .map_irq = fsg_map_irq, |
| 66 | }; |
| 67 | |
| 68 | int __init fsg_pci_init(void) |
| 69 | { |
| 70 | if (machine_is_fsg()) |
| 71 | pci_common_init(&fsg_pci); |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | subsys_initcall(fsg_pci_init); |