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
  31 static 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 }
  65 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources);
  66
  67 int __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 }