kernel/2.6.29.6-aldebaran-rt/arch/arm/mach-ixp4xx/fsg-pci.c

   1 /*
   2  * arch/arch/mach-ixp4xx/fsg-pci.c
   3  *
   4  * FSG board-level PCI initialization
   5  *
   6  * Author: Rod Whitby <rod@whitby.id.au>
   7  * Maintainer: http://www.nslu2-linux.org/
   8  *
   9  * based on ixdp425-pci.c:
  10  *      Copyright (C) 2002 Intel Corporation.
  11  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  *
  17  */
  18
  19 #include <linux/pci.h>
  20 #include <linux/init.h>
  21 #include <linux/irq.h>
  22
  23 #include <asm/mach/pci.h>
  24 #include <asm/mach-types.h>
  25
  26 void __init fsg_pci_preinit(void)
  27 {
  28         set_irq_type(IRQ_FSG_PCI_INTA, IRQ_TYPE_LEVEL_LOW);
  29         set_irq_type(IRQ_FSG_PCI_INTB, IRQ_TYPE_LEVEL_LOW);
  30         set_irq_type(IRQ_FSG_PCI_INTC, IRQ_TYPE_LEVEL_LOW);
  31
  32         ixp4xx_pci_preinit();
  33 }
  34
  35 static int __init fsg_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  36 {
  37         static int pci_irq_table[FSG_PCI_IRQ_LINES] = {
  38                 IRQ_FSG_PCI_INTC,
  39                 IRQ_FSG_PCI_INTB,
  40                 IRQ_FSG_PCI_INTA,
  41         };
  42
  43         int irq = -1;
  44         slot = slot - 11;
  45
  46         if (slot >= 1 && slot <= FSG_PCI_MAX_DEV &&
  47             pin >= 1 && pin <= FSG_PCI_IRQ_LINES)
  48                 irq = pci_irq_table[(slot - 1)];
  49         printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
  50                __func__, slot, pin, irq);
  51
  52         return irq;
  53 }
  54
  55 struct hw_pci fsg_pci __initdata = {
  56         .nr_controllers = 1,
  57         .preinit =        fsg_pci_preinit,
  58         .swizzle =        pci_std_swizzle,
  59         .setup =          ixp4xx_setup,
  60         .scan =           ixp4xx_scan_bus,
  61         .map_irq =        fsg_map_irq,
  62 };
  63
  64 int __init fsg_pci_init(void)
  65 {
  66         if (machine_is_fsg())
  67                 pci_common_init(&fsg_pci);
  68         return 0;
  69 }
  70
  71 subsys_initcall(fsg_pci_init);