LXR linux/arch/mips/pci/fixup-rbtx4927.c

   1/*
   2 *
   3 * BRIEF MODULE DESCRIPTION
   4 *      Board specific pci fixups for the Toshiba rbtx4927
   5 *
   6 * Copyright 2001 MontaVista Software Inc.
   7 * Author: MontaVista Software, Inc.
   8 *              ppopov@mvista.com or source@mvista.com
   9 *
  10 * Copyright (C) 2000-2001 Toshiba Corporation
  11 *
  12 * Copyright (C) 2004 MontaVista Software Inc.
  13 * Author: Manish Lachwani (mlachwani@mvista.com)
  14 *
  15 *  This program is free software; you can redistribute  it and/or modify it
  16 *  under  the terms of  the GNU General  Public License as published by the
  17 *  Free Software Foundation;  either version 2 of the  License, or (at your
  18 *  option) any later version.
  19 *
  20 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  21 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  22 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  23 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  24 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  25 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  26 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  27 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  28 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  29 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30 *
  31 *  You should have received a copy of the  GNU General Public License along
  32 *  with this program; if not, write  to the Free Software Foundation, Inc.,
  33 *  675 Mass Ave, Cambridge, MA 02139, USA.
  34 */
  35#include <linux/types.h>
  36#include <asm/txx9/pci.h>
  37#include <asm/txx9/rbtx4927.h>
  38
  39int rbtx4927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  40{
  41        unsigned char irq = pin;
  42
  43        /* IRQ rotation */
  44        irq--;                  /* 0-3 */
  45        if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) {
  46                /* PCI CardSlot (IDSEL=A23) */
  47                /* PCIA => PCIA */
  48                irq = (irq + 0 + slot) % 4;
  49        } else {
  50                /* PCI Backplane */
  51                if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
  52                        irq = (irq + 33 - slot) % 4;
  53                else
  54                        irq = (irq + 3 + slot) % 4;
  55        }
  56        irq++;  /* 1-4 */
  57
  58        switch (irq) {
  59        case 1:
  60                irq = RBTX4927_IRQ_IOC_PCIA;
  61                break;
  62        case 2:
  63                irq = RBTX4927_IRQ_IOC_PCIB;
  64                break;
  65        case 3:
  66                irq = RBTX4927_IRQ_IOC_PCIC;
  67                break;
  68        case 4:
  69                irq = RBTX4927_IRQ_IOC_PCID;
  70                break;
  71        }
  72        return irq;
  73}
  74