1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/arm/mach-footbridge/cats-pci.c
5 * PCI bios-type initialisation for PCI machines
7 * Bits taken from various places.
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/init.h>
14 #include <asm/mach/pci.h>
15 #include <asm/mach-types.h>
17 /* cats host-specific stuff */
18 static int irqmap_cats[] = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
20 static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
25 static int cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
28 return -1; /* not a valid interrupt. */
31 return dev->irq & 0x1f;
33 if (dev->irq >= 1 && dev->irq <= 4)
34 return irqmap_cats[dev->irq - 1];
37 printk("PCI: device %02x:%02x has unknown irq line %x\n",
38 dev->bus->number, dev->devfn, dev->irq);
44 * why not the standard PCI swizzle? does this prevent 4-port tulip
45 * cards being used (ie, pci-pci bridge based cards)?
47 static struct hw_pci cats_pci __initdata = {
48 .swizzle = cats_no_swizzle,
49 .map_irq = cats_map_irq,
52 .setup = dc21285_setup,
53 .preinit = dc21285_preinit,
54 .postinit = dc21285_postinit,
57 static int __init cats_pci_init(void)
59 if (machine_is_cats())
60 pci_common_init(&cats_pci);
64 subsys_initcall(cats_pci_init);