1 // SPDX-License-Identifier: GPL-2.0-only
3 * arch/arm/mach-ixp4xx/nslu2-pci.c
5 * NSLU2 board-level PCI initialization
7 * based on ixdp425-pci.c:
8 * Copyright (C) 2002 Intel Corporation.
9 * Copyright (C) 2003-2004 MontaVista Software, Inc.
11 * Maintainer: http://www.nslu2-linux.org/
14 #include <linux/pci.h>
15 #include <linux/init.h>
16 #include <linux/irq.h>
17 #include <asm/mach/pci.h>
18 #include <asm/mach-types.h>
25 /* PCI controller GPIO to IRQ pin mappings */
31 void __init nslu2_pci_preinit(void)
33 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
34 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
35 irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
39 static int __init nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
41 static int pci_irq_table[IRQ_LINES] = {
42 IXP4XX_GPIO_IRQ(INTA),
43 IXP4XX_GPIO_IRQ(INTB),
44 IXP4XX_GPIO_IRQ(INTC),
47 if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
48 return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
53 struct hw_pci __initdata nslu2_pci = {
56 .preinit = nslu2_pci_preinit,
57 .setup = ixp4xx_setup,
58 .map_irq = nslu2_map_irq,
61 int __init nslu2_pci_init(void) /* monkey see, monkey do */
63 if (machine_is_nslu2())
64 pci_common_init(&nslu2_pci);
69 subsys_initcall(nslu2_pci_init);