release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/drivers/pci/fixups-landisk.c

   1 /*
   2  * arch/sh/drivers/pci/ops-landisk.c
   3  *
   4  * PCI initialization for the I-O DATA Device, Inc. LANDISK board
   5  *
   6  * Copyright (C) 2006 kogiidena
   7  *
   8  * May be copied or modified under the terms of the GNU General Public
   9  * License.  See linux/COPYING for more information.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/init.h>
  14 #include <linux/delay.h>
  15 #include <linux/pci.h>
  16 #include "pci-sh4.h"
  17
  18 int pcibios_map_platform_irq(struct pci_dev *pdev, u8 slot, u8 pin)
  19 {
  20         /*
  21          * slot0: pin1-4 = irq5,6,7,8
  22          * slot1: pin1-4 = irq6,7,8,5
  23          * slot2: pin1-4 = irq7,8,5,6
  24          * slot3: pin1-4 = irq8,5,6,7
  25          */
  26         int irq = ((slot + pin - 1) & 0x3) + 5;
  27
  28         if ((slot | (pin - 1)) > 0x3) {
  29                 printk("PCI: Bad IRQ mapping request for slot %d pin %c\n",
  30                        slot, pin - 1 + 'A');
  31                 return -1;
  32         }
  33         return irq;
  34 }