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
  16 int 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 }