LXR linux/arch/mips/pci/fixup-rbtx4938.c

   1/*
   2 * Toshiba rbtx4938 pci routines
   3 * Copyright (C) 2000-2001 Toshiba Corporation
   4 *
   5 * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
   6 * terms of the GNU General Public License version 2. This program is
   7 * licensed "as is" without any warranty of any kind, whether express
   8 * or implied.
   9 *
  10 * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
  11 */
  12#include <linux/types.h>
  13#include <asm/txx9/pci.h>
  14#include <asm/txx9/rbtx4938.h>
  15
  16int rbtx4938_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  17{
  18        int irq = tx4938_pcic1_map_irq(dev, slot);
  19
  20        if (irq >= 0)
  21                return irq;
  22        irq = pin;
  23        /* IRQ rotation */
  24        irq--;  /* 0-3 */
  25        if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
  26                /* PCI CardSlot (IDSEL=A23) */
  27                /* PCIA => PCIA (IDSEL=A23) */
  28                irq = (irq + 0 + slot) % 4;
  29        } else {
  30                /* PCI Backplane */
  31                if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
  32                        irq = (irq + 33 - slot) % 4;
  33                else
  34                        irq = (irq + 3 + slot) % 4;
  35        }
  36        irq++;  /* 1-4 */
  37
  38        switch (irq) {
  39        case 1:
  40                irq = RBTX4938_IRQ_IOC_PCIA;
  41                break;
  42        case 2:
  43                irq = RBTX4938_IRQ_IOC_PCIB;
  44                break;
  45        case 3:
  46                irq = RBTX4938_IRQ_IOC_PCIC;
  47                break;
  48        case 4:
  49                irq = RBTX4938_IRQ_IOC_PCID;
  50                break;
  51        }
  52        return irq;
  53}
  54