1 /*
2 * linux/arch/arm/mach-footbridge/cats-pci.c
3 *
4 * PCI bios-type initialisation for PCI machines
5 *
6 * Bits taken from various places.
7 */
8 #include <linux/kernel.h>
9 #include <linux/pci.h>
10 #include <linux/init.h>
11
12 #include <asm/irq.h>
13 #include <asm/mach/pci.h>
14 #include <asm/mach-types.h>
15
16 /* cats host-specific stuff */
17 static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
18
cats_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)19 static int __init cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
20 {
21 if (dev->irq >= 255)
22 return -1; /* not a valid interrupt. */
23
24 if (dev->irq >= 128)
25 return dev->irq & 0x1f;
26
27 if (dev->irq >= 1 && dev->irq <= 4)
28 return irqmap_cats[dev->irq - 1];
29
30 if (dev->irq != 0)
31 printk("PCI: device %02x:%02x has unknown irq line %x\n",
32 dev->bus->number, dev->devfn, dev->irq);
33
34 return -1;
35 }
36
37 /*
38 * why not the standard PCI swizzle? does this prevent 4-port tulip
39 * cards being used (ie, pci-pci bridge based cards)?
40 */
41 static struct hw_pci cats_pci __initdata = {
42 .swizzle = NULL,
43 .map_irq = cats_map_irq,
44 .nr_controllers = 1,
45 .setup = dc21285_setup,
46 .scan = dc21285_scan_bus,
47 .preinit = dc21285_preinit,
48 .postinit = dc21285_postinit,
49 };
50
cats_pci_init(void)51 static int __init cats_pci_init(void)
52 {
53 if (machine_is_cats())
54 pci_common_init(&cats_pci);
55 return 0;
56 }
57
58 subsys_initcall(cats_pci_init);
59