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         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_MAP |
  71                                                 DMA_MEMORY_EXCLUSIVE));
  72                 break;
  73         default:
  74                 printk("PCI: Failed resource fixup\n");
  75         }
  76 }
  77 DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources);
  78
  79 int __init pcibios_map_platform_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  80 {
  81         /*
  82          * The interrupt routing semantics here are quite trivial.
  83          *
  84          * We basically only support one interrupt, so we only bother
  85          * updating a device's interrupt line with this single shared
  86          * interrupt. Keeps routing quite simple, doesn't it?
  87          */
  88         return GAPSPCI_IRQ;
  89 }