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_no_swizzle(struct pci_dev * dev,u8 * pin)19 static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
20 {
21 return 0;
22 }
23
cats_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)24 static int __init cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
25 {
26 if (dev->irq >= 255)
27 return -1; /* not a valid interrupt. */
28
29 if (dev->irq >= 128)
30 return dev->irq & 0x1f;
31
32 if (dev->irq >= 1 && dev->irq <= 4)
33 return irqmap_cats[dev->irq - 1];
34
35 if (dev->irq != 0)
36 printk("PCI: device %02x:%02x has unknown irq line %x\n",
37 dev->bus->number, dev->devfn, dev->irq);
38
39 return -1;
40 }
41
42 /*
43 * why not the standard PCI swizzle? does this prevent 4-port tulip
44 * cards being used (ie, pci-pci bridge based cards)?
45 */
46 static struct hw_pci cats_pci __initdata = {
47 .swizzle = cats_no_swizzle,
48 .map_irq = cats_map_irq,
49 .nr_controllers = 1,
50 .ops = &dc21285_ops,
51 .setup = dc21285_setup,
52 .preinit = dc21285_preinit,
53 .postinit = dc21285_postinit,
54 };
55
cats_pci_init(void)56 static int __init cats_pci_init(void)
57 {
58 if (machine_is_cats())
59 pci_common_init(&cats_pci);
60 return 0;
61 }
62
63 subsys_initcall(cats_pci_init);
64