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

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/arch/arm/mach-footbridge/cats-pci.c
   4 *
   5 * PCI bios-type initialisation for PCI machines
   6 *
   7 * Bits taken from various places.
   8 */
   9#include <linux/kernel.h>
  10#include <linux/pci.h>
  11#include <linux/init.h>
  12
  13#include <asm/irq.h>
  14#include <asm/mach/pci.h>
  15#include <asm/mach-types.h>
  16
  17/* cats host-specific stuff */
  18static int irqmap_cats[] __initdata = { IRQ_PCI, IRQ_IN0, IRQ_IN1, IRQ_IN3 };
  19
  20static u8 cats_no_swizzle(struct pci_dev *dev, u8 *pin)
  21{
  22        return 0;
  23}
  24
  25static int __init cats_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  26{
  27        if (dev->irq >= 255)
  28                return -1;      /* not a valid interrupt. */
  29
  30        if (dev->irq >= 128)
  31                return dev->irq & 0x1f;
  32
  33        if (dev->irq >= 1 && dev->irq <= 4)
  34                return irqmap_cats[dev->irq - 1];
  35
  36        if (dev->irq != 0)
  37                printk("PCI: device %02x:%02x has unknown irq line %x\n",
  38                       dev->bus->number, dev->devfn, dev->irq);
  39
  40        return -1;
  41}
  42
  43/*
  44 * why not the standard PCI swizzle?  does this prevent 4-port tulip
  45 * cards being used (ie, pci-pci bridge based cards)?
  46 */
  47static struct hw_pci cats_pci __initdata = {
  48        .swizzle                = cats_no_swizzle,
  49        .map_irq                = cats_map_irq,
  50        .nr_controllers         = 1,
  51        .ops                    = &dc21285_ops,
  52        .setup                  = dc21285_setup,
  53        .preinit                = dc21285_preinit,
  54        .postinit               = dc21285_postinit,
  55};
  56
  57static int __init cats_pci_init(void)
  58{
  59        if (machine_is_cats())
  60                pci_common_init(&cats_pci);
  61        return 0;
  62}
  63
  64subsys_initcall(cats_pci_init);
  65