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 #include <asm/mach/pci.h>
  22 #include <asm/mach-types.h>
  23
  24 #define MAX_DEV         3
  25 #define IRQ_LINES       3
  26
  27 /* PCI controller GPIO to IRQ pin mappings */
  28 #define INTA            11
  29 #define INTB            10
  30 #define INTC            9
  31 #define INTD            8
  32
  33 void __init nslu2_pci_preinit(void)
  34 {
  35         set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  36         set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  37         set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  38         ixp4xx_pci_preinit();
  39 }
  40
  41 static int __init nslu2_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  42 {
  43         static int pci_irq_table[IRQ_LINES] = {
  44                 IXP4XX_GPIO_IRQ(INTA),
  45                 IXP4XX_GPIO_IRQ(INTB),
  46                 IXP4XX_GPIO_IRQ(INTC),
  47         };
  48
  49         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  50                 return pci_irq_table[(slot + pin - 2) % IRQ_LINES];
  51
  52         return -1;
  53 }
  54
  55 struct hw_pci __initdata nslu2_pci = {
  56         .nr_controllers = 1,
  57         .preinit        = nslu2_pci_preinit,
  58         .swizzle        = pci_std_swizzle,
  59         .setup          = ixp4xx_setup,
  60         .scan           = ixp4xx_scan_bus,
  61         .map_irq        = nslu2_map_irq,
  62 };
  63
  64 int __init nslu2_pci_init(void) /* monkey see, monkey do */
  65 {
  66         if (machine_is_nslu2())
  67                 pci_common_init(&nslu2_pci);
  68
  69         return 0;
  70 }
  71
  72 subsys_initcall(nslu2_pci_init);