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, ®ion, &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 } 90