LXR linux/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
  34int 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}
  80