release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-ixp4xx/nas100d-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/nas100d-pci.c
   3  *
   4  * NAS 100d 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 #define INTE            7
  33
  34 void __init nas100d_pci_preinit(void)
  35 {
  36         set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  37         set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  38         set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW);
  39         set_irq_type(IXP4XX_GPIO_IRQ(INTD), IRQ_TYPE_LEVEL_LOW);
  40         set_irq_type(IXP4XX_GPIO_IRQ(INTE), IRQ_TYPE_LEVEL_LOW);
  41         ixp4xx_pci_preinit();
  42 }
  43
  44 static int __init nas100d_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  45 {
  46         static int pci_irq_table[MAX_DEV][IRQ_LINES] = {
  47                 { IXP4XX_GPIO_IRQ(INTA), -1, -1 },
  48                 { IXP4XX_GPIO_IRQ(INTB), -1, -1 },
  49                 { IXP4XX_GPIO_IRQ(INTC), IXP4XX_GPIO_IRQ(INTD),
  50                   IXP4XX_GPIO_IRQ(INTE) },
  51         };
  52
  53         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  54                 return pci_irq_table[slot - 1][pin - 1];
  55
  56         return -1;
  57 }
  58
  59 struct hw_pci __initdata nas100d_pci = {
  60         .nr_controllers = 1,
  61         .preinit        = nas100d_pci_preinit,
  62         .swizzle        = pci_std_swizzle,
  63         .setup          = ixp4xx_setup,
  64         .scan           = ixp4xx_scan_bus,
  65         .map_irq        = nas100d_map_irq,
  66 };
  67
  68 int __init nas100d_pci_init(void)
  69 {
  70         if (machine_is_nas100d())
  71                 pci_common_init(&nas100d_pci);
  72
  73         return 0;
  74 }
  75
  76 subsys_initcall(nas100d_pci_init);