LXR linux/arch/arm/mach-footbridge/cats-pci.c

   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 */
  17static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
  18
  19static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
  20{
  21        return 0;
  22}
  23
  24static 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 */
  46static 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
  56static int __init cats_pci_init(void)
  57{
  58        if (machine_is_cats())
  59                pci_common_init(&cats_pci);
  60        return 0;
  61}
  62
  63subsys_initcall(cats_pci_init);
  64