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