release/src-rt-6.x.4708/linux/linux-2.6.36/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 #include <asm/mach/pci.h>
  23 #include <asm/mach-types.h>
  24
  25 #define MAX_DEV         3
  26 #define IRQ_LINES       3
  27
  28 /* PCI controller GPIO to IRQ pin mappings */
  29 #define INTA    6
  30 #define INTB    7
  31 #define INTC    5
  32
  33 void __init fsg_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 fsg_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  42 {
  43         static int pci_irq_table[IRQ_LINES] = {
  44                 IXP4XX_GPIO_IRQ(INTC),
  45                 IXP4XX_GPIO_IRQ(INTB),
  46                 IXP4XX_GPIO_IRQ(INTA),
  47         };
  48
  49         int irq = -1;
  50         slot -= 11;
  51
  52         if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES)
  53                 irq = pci_irq_table[slot - 1];
  54         printk(KERN_INFO "%s: Mapped slot %d pin %d to IRQ %d\n",
  55                __func__, slot, pin, irq);
  56
  57         return irq;
  58 }
  59
  60 struct hw_pci fsg_pci __initdata = {
  61         .nr_controllers = 1,
  62         .preinit =        fsg_pci_preinit,
  63         .swizzle =        pci_std_swizzle,
  64         .setup =          ixp4xx_setup,
  65         .scan =           ixp4xx_scan_bus,
  66         .map_irq =        fsg_map_irq,
  67 };
  68
  69 int __init fsg_pci_init(void)
  70 {
  71         if (machine_is_fsg())
  72                 pci_common_init(&fsg_pci);
  73         return 0;
  74 }
  75
  76 subsys_initcall(fsg_pci_init);