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

   1 /*
   2  * arch/arch/mach-ixp4xx/vulcan-pci.c
   3  *
   4  * Vulcan board-level PCI initialization
   5  *
   6  * Copyright (C) 2010 Marc Zyngier <maz@misterjones.org>
   7  *
   8  * based on ixdp425-pci.c:
   9  *      Copyright (C) 2002 Intel Corporation.
  10  *      Copyright (C) 2003-2004 MontaVista Software, Inc.
  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 /* PCI controller GPIO to IRQ pin mappings */
  25 #define INTA    2
  26 #define INTB    3
  27
  28 void __init vulcan_pci_preinit(void)
  29 {
  30 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
  31         /*
  32          * Cardbus bridge wants way more than the SoC can actually offer,
  33          * and leaves the whole PCI bus in a mess. Artificially limit it
  34          * to 8MB per region. Of course indirect mode doesn't have this
  35          * limitation...
  36          */
  37         pci_cardbus_mem_size = SZ_8M;
  38         pr_info("Vulcan PCI: limiting CardBus memory size to %dMB\n",
  39                 (int)(pci_cardbus_mem_size >> 20));
  40 #endif
  41         set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
  42         set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
  43         ixp4xx_pci_preinit();
  44 }
  45
  46 static int __init vulcan_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  47 {
  48         if (slot == 1)
  49                 return IXP4XX_GPIO_IRQ(INTA);
  50
  51         if (slot == 2)
  52                 return IXP4XX_GPIO_IRQ(INTB);
  53
  54         return -1;
  55 }
  56
  57 struct hw_pci vulcan_pci __initdata = {
  58         .nr_controllers = 1,
  59         .preinit        = vulcan_pci_preinit,
  60         .swizzle        = pci_std_swizzle,
  61         .setup          = ixp4xx_setup,
  62         .scan           = ixp4xx_scan_bus,
  63         .map_irq        = vulcan_map_irq,
  64 };
  65
  66 int __init vulcan_pci_init(void)
  67 {
  68         if (machine_is_arcom_vulcan())
  69                 pci_common_init(&vulcan_pci);
  70         return 0;
  71 }
  72
  73 subsys_initcall(vulcan_pci_init);