release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/pci/fixup-jmr3927.c

   1 /*
   2  *
   3  * BRIEF MODULE DESCRIPTION
   4  *      Board specific pci fixups.
   5  *
   6  * Copyright 2001 MontaVista Software Inc.
   7  * Author: MontaVista Software, Inc.
   8  *              ppopov@mvista.com or source@mvista.com
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  16  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  17  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  18  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  19  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  21  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  22  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  23  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  *  You should have received a copy of the  GNU General Public License along
  27  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  28  *  675 Mass Ave, Cambridge, MA 02139, USA.
  29  */
  30 #include <linux/types.h>
  31 #include <asm/txx9/pci.h>
  32 #include <asm/txx9/jmr3927.h>
  33
  34 int __init jmr3927_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  35 {
  36         unsigned char irq = pin;
  37
  38         /* IRQ rotation (PICMG) */
  39         irq--;                  /* 0-3 */
  40         if (slot == TX3927_PCIC_IDSEL_AD_TO_SLOT(23)) {
  41                 /* PCI CardSlot (IDSEL=A23, DevNu=12) */
  42                 /* PCIA => PCIC (IDSEL=A23) */
  43                 /* NOTE: JMR3927 JP1 must be set to OPEN */
  44                 irq = (irq + 2) % 4;
  45         } else if (slot == TX3927_PCIC_IDSEL_AD_TO_SLOT(22)) {
  46                 /* PCI CardSlot (IDSEL=A22, DevNu=11) */
  47                 /* PCIA => PCIA (IDSEL=A22) */
  48                 /* NOTE: JMR3927 JP1 must be set to OPEN */
  49                 irq = (irq + 0) % 4;
  50         } else {
  51                 /* PCI Backplane */
  52                 if (txx9_pci_option & TXX9_PCI_OPT_PICMG)
  53                         irq = (irq + 33 - slot) % 4;
  54                 else
  55                         irq = (irq + 3 + slot) % 4;
  56         }
  57         irq++;                  /* 1-4 */
  58
  59         switch (irq) {
  60         case 1:
  61                 irq = JMR3927_IRQ_IOC_PCIA;
  62                 break;
  63         case 2:
  64                 irq = JMR3927_IRQ_IOC_PCIB;
  65                 break;
  66         case 3:
  67                 irq = JMR3927_IRQ_IOC_PCIC;
  68                 break;
  69         case 4:
  70                 irq = JMR3927_IRQ_IOC_PCID;
  71                 break;
  72         }
  73
  74         /* Check OnBoard Ethernet (IDSEL=A24, DevNu=13) */
  75         if (dev->bus->parent == NULL &&
  76             slot == TX3927_PCIC_IDSEL_AD_TO_SLOT(24))
  77                 irq = JMR3927_IRQ_ETHER0;
  78         return irq;
  79 }