2 * linux/arch/arm/mach-integrator/pci-integrator.c
4 * Copyright (C) 1999 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * PCI functions for Integrator
24 #include <linux/kernel.h>
25 #include <linux/pci.h>
26 #include <linux/interrupt.h>
27 #include <linux/init.h>
30 #include <asm/mach/pci.h>
31 #include <asm/mach-types.h>
34 * A small note about bridges and interrupts. The DECchip 21050 (and
35 * later) adheres to the PCI-PCI bridge specification. This says that
36 * the interrupts on the other side of a bridge are swizzled in the
39 * Dev Interrupt Interrupt
63 * Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
64 * Thus, each swizzle is ((pin-1) + (device#-4)) % 4
68 * This routine handles multiple bridges.
70 static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
77 while (dev->bus->self) {
78 pin = pci_swizzle_interrupt_pin(dev, pin);
80 * move up the chain of bridges, swizzling as we go.
86 return PCI_SLOT(dev->devfn);
89 static int irq_tab[4] __initdata = {
90 IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3
94 * map the specified device/slot/pin to an IRQ. This works out such
95 * that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
97 static int __init integrator_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
99 int intnr = ((slot - 9) + (pin - 1)) & 3;
101 return irq_tab[intnr];
104 extern void pci_v3_init(void *);
106 static struct hw_pci integrator_pci __initdata = {
107 .swizzle = integrator_swizzle,
108 .map_irq = integrator_map_irq,
109 .setup = pci_v3_setup,
111 .scan = pci_v3_scan_bus,
112 .preinit = pci_v3_preinit,
113 .postinit = pci_v3_postinit,
116 static int __init integrator_pci_init(void)
118 if (machine_is_integrator())
119 pci_common_init(&integrator_pci);
123 subsys_initcall(integrator_pci_init);