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Linux/arch/sh/drivers/pci/fixups-dreamcast.c

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  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 }
 78 

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