LXR linux/arch/sh/drivers/pci/fixups-dreamcast.c

   1/*
   2 * arch/sh/drivers/pci/fixups-dreamcast.c
   3 *
   4 * PCI fixups for the Sega Dreamcast
   5 *
   6 * Copyright (C) 2001, 2002  M. R. Brown
   7 * Copyright (C) 2002, 2003, 2006  Paul Mundt
   8 *
   9 * This file originally bore the message (with enclosed-$):
  10 *      Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
  11 *      Dreamcast PCI: Supports SEGA Broadband Adaptor only.
  12 *
  13 * This file is subject to the terms and conditions of the GNU General Public
  14 * License.  See the file "COPYING" in the main directory of this archive
  15 * for more details.
  16 */
  17
  18#include <linux/sched.h>
  19#include <linux/kernel.h>
  20#include <linux/param.h>
  21#include <linux/interrupt.h>
  22#include <linux/init.h>
  23#include <linux/irq.h>
  24#include <linux/pci.h>
  25#include <linux/dma-mapping.h>
  26
  27#include <asm/io.h>
  28#include <asm/irq.h>
  29#include <mach/pci.h>
  30
  31static void gapspci_fixup_resources(struct pci_dev *dev)
  32{
  33        struct pci_channel *p = dev->sysdata;
  34
  35        printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev));
  36
  37        switch (dev->device) {
  38        case PCI_DEVICE_ID_SEGA_BBA:
  39                /*
  40                 * We also assume that dev->devfn == 0
  41                 */
  42                dev->resource[1].start  = p->resources[0].start  + 0x100;
  43                dev->resource[1].end    = dev->resource[1].start + 0x200 - 1;
  44
  45                /*
  46                 * This is not a normal BAR, prevent any attempts to move
  47                 * the BAR, as this will result in a bus lock.
  48                 */
  49                dev->resource[1].flags |= IORESOURCE_PCI_FIXED;
  50
  51                /*
  52                 * Redirect dma memory allocations to special memory window.
  53                 */
  54                BUG_ON(!dma_declare_coherent_memory(&dev->dev,
  55                                                GAPSPCI_DMA_BASE,
  56                                                GAPSPCI_DMA_BASE,
  57                                                GAPSPCI_DMA_SIZE,
  58                                                DMA_MEMORY_MAP |
  59                                                DMA_MEMORY_EXCLUSIVE));
  60                break;
  61        default:
  62                printk("PCI: Failed resource fixup\n");
  63        }
  64}
  65DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources);
  66
  67int __init pcibios_map_platform_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  68{
  69        /*
  70         * The interrupt routing semantics here are quite trivial.
  71         *
  72         * We basically only support one interrupt, so we only bother
  73         * updating a device's interrupt line with this single shared
  74         * interrupt. Keeps routing quite simple, doesn't it?
  75         */
  76        return GAPSPCI_IRQ;
  77}
  78