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 __init 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