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
  39 int 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 }