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 int __init cats_map_irq(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 */
  41static 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
  51static int __init cats_pci_init(void)
  52{
  53        if (machine_is_cats())
  54                pci_common_init(&cats_pci);
  55        return 0;
  56}
  57
  58subsys_initcall(cats_pci_init);
  59