Linux Kernel  3.7.1
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cats-pci.c
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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 
19 static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
20 {
21  return 0;
22 }
23 
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 
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);