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        struct resource res;
  35        struct pci_bus_region region;
  36
  37        printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev));
  38
  39        switch (dev->device) {
  40        case PCI_DEVICE_ID_SEGA_BBA:
  41                /*
  42                 * We also assume that dev->devfn == 0
  43                 */
  44                dev->resource[1].start  = p->resources[0].start  + 0x100;
  45                dev->resource[1].end    = dev->resource[1].start + 0x200 - 1;
  46
  47                /*
  48                 * This is not a normal BAR, prevent any attempts to move
  49                 * the BAR, as this will result in a bus lock.
  50                 */
  51                dev->resource[1].flags |= IORESOURCE_PCI_FIXED;
  52
  53                /*
  54                 * Redirect dma memory allocations to special memory window.
  55                 *
  56                 * If this GAPSPCI region were mapped by a BAR, the CPU
  57                 * phys_addr_t would be pci_resource_start(), and the bus
  58                 * address would be pci_bus_address(pci_resource_start()).
  59                 * But apparently there's no BAR mapping it, so we just
  60                 * "know" its CPU address is GAPSPCI_DMA_BASE.
  61                 */
  62                res.start = GAPSPCI_DMA_BASE;
  63                res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1;
  64                res.flags = IORESOURCE_MEM;
  65                pcibios_resource_to_bus(dev->bus, &region, &res);
  66                BUG_ON(dma_declare_coherent_memory(&dev->dev,
  67                                                res.start,
  68                                                region.start,
  69                                                resource_size(&res),
  70                                                DMA_MEMORY_EXCLUSIVE));
  71                break;
  72        default:
  73                printk("PCI: Failed resource fixup\n");
  74        }
  75}
  76DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources);
  77
  78int pcibios_map_platform_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  79{
  80        /*
  81         * The interrupt routing semantics here are quite trivial.
  82         *
  83         * We basically only support one interrupt, so we only bother
  84         * updating a device's interrupt line with this single shared
  85         * interrupt. Keeps routing quite simple, doesn't it?
  86         */
  87        return GAPSPCI_IRQ;
  88}
  89