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 33void __init fsg_pci_preinit(void) 34{ 35 set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW); 36 set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW); 37 set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW); 38 ixp4xx_pci_preinit(); 39} 40 41static int __init fsg_map_irq(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 60struct hw_pci fsg_pci __initdata = { 61 .nr_controllers = 1, 62 .preinit = fsg_pci_preinit, 63 .swizzle = pci_std_swizzle, 64 .setup = ixp4xx_setup, 65 .scan = ixp4xx_scan_bus, 66 .map_irq = fsg_map_irq, 67}; 68 69int __init fsg_pci_init(void) 70{ 71 if (machine_is_fsg()) 72 pci_common_init(&fsg_pci); 73 return 0; 74} 75 76subsys_initcall(fsg_pci_init); 77