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 */
  17 static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
  18
  19 static int __init cats_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  20 {
  21         if (dev->irq >= 128)
  22                 return dev->irq & 0x1f;
  23
  24         if (dev->irq >= 1 && dev->irq <= 4)
  25                 return irqmap_cats[dev->irq - 1];
  26
  27         if (dev->irq != 0)
  28                 printk("PCI: device %02x:%02x has unknown irq line %x\n",
  29                        dev->bus->number, dev->devfn, dev->irq);
  30
  31         return -1;
  32 }
  33
  34 /*
  35  * why not the standard PCI swizzle?  does this prevent 4-port tulip
  36  * cards being used (ie, pci-pci bridge based cards)?
  37  */
  38 static struct hw_pci cats_pci __initdata = {
  39         .swizzle                = NULL,
  40         .map_irq                = cats_map_irq,
  41         .nr_controllers         = 1,
  42         .setup                  = dc21285_setup,
  43         .scan                   = dc21285_scan_bus,
  44         .preinit                = dc21285_preinit,
  45         .postinit               = dc21285_postinit,
  46 };
  47
  48 static int cats_pci_init(void)
  49 {
  50         if (machine_is_cats())
  51                 pci_common_init(&cats_pci);
  52         return 0;
  53 }
  54
  55 subsys_initcall(cats_pci_init);