arch/arm/mach-ixp4xx/nslu2-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/nslu2-pci.c
   3  *
   4  * NSLU2 board-level PCI initialization
   5  *
   6  * based on ixdp425-pci.c:
   7  *      Copyright (C) 2002 Intel Corporation.
   8  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
   9  *
  10  * Maintainer: http://www.nslu2-linux.org/
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  */
  17
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20 #include <linux/irq.h>
  21
  22 #include <asm/mach/pci.h>
  23 #include <asm/mach-types.h>
  24
  25 void __init nslu2_pci_preinit(void)
  26 {
  27         set_irq_type(IRQ_NSLU2_PCI_INTA, IRQ_TYPE_LEVEL_LOW);
  28         set_irq_type(IRQ_NSLU2_PCI_INTB, IRQ_TYPE_LEVEL_LOW);
  29         set_irq_type(IRQ_NSLU2_PCI_INTC, IRQ_TYPE_LEVEL_LOW);
  30
  31         ixp4xx_pci_preinit();
  32 }
  33
  34 static int __init nslu2_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  35 {
  36         static int pci_irq_table[NSLU2_PCI_IRQ_LINES] = {
  37                 IRQ_NSLU2_PCI_INTA,
  38                 IRQ_NSLU2_PCI_INTB,
  39                 IRQ_NSLU2_PCI_INTC,
  40         };
  41
  42         int irq = -1;
  43
  44         if (slot >= 1 && slot <= NSLU2_PCI_MAX_DEV &&
  45                 pin >= 1 && pin <= NSLU2_PCI_IRQ_LINES) {
  46                         irq = pci_irq_table[(slot + pin - 2) % NSLU2_PCI_IRQ_LINES];
  47         }
  48
  49         return irq;
  50 }
  51
  52 struct hw_pci __initdata nslu2_pci = {
  53         .nr_controllers = 1,
  54         .preinit        = nslu2_pci_preinit,
  55         .swizzle        = pci_std_swizzle,
  56         .setup          = ixp4xx_setup,
  57         .scan           = ixp4xx_scan_bus,
  58         .map_irq        = nslu2_map_irq,
  59 };
  60
  61 int __init nslu2_pci_init(void) /* monkey see, monkey do */
  62 {
  63         if (machine_is_nslu2())
  64                 pci_common_init(&nslu2_pci);
  65
  66         return 0;
  67 }
  68
  69 subsys_initcall(nslu2_pci_init);