1ff4a7481SKuninori Morimoto // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
3f30c2269SUwe Zeisberger * arch/sh/drivers/pci/fixups-dreamcast.c
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * PCI fixups for the Sega Dreamcast
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * Copyright (C) 2001, 2002 M. R. Brown
8959f85f8SPaul Mundt * Copyright (C) 2002, 2003, 2006 Paul Mundt
91da177e4SLinus Torvalds *
101da177e4SLinus Torvalds * This file originally bore the message (with enclosed-$):
111da177e4SLinus Torvalds * Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
121da177e4SLinus Torvalds * Dreamcast PCI: Supports SEGA Broadband Adaptor only.
131da177e4SLinus Torvalds */
141da177e4SLinus Torvalds
151da177e4SLinus Torvalds #include <linux/sched.h>
161da177e4SLinus Torvalds #include <linux/kernel.h>
171da177e4SLinus Torvalds #include <linux/param.h>
181da177e4SLinus Torvalds #include <linux/interrupt.h>
191da177e4SLinus Torvalds #include <linux/init.h>
201da177e4SLinus Torvalds #include <linux/irq.h>
211da177e4SLinus Torvalds #include <linux/pci.h>
22*0a0f0d8bSChristoph Hellwig #include <linux/dma-map-ops.h>
231da177e4SLinus Torvalds
241da177e4SLinus Torvalds #include <asm/io.h>
251da177e4SLinus Torvalds #include <asm/irq.h>
26f15cbe6fSPaul Mundt #include <mach/pci.h>
271da177e4SLinus Torvalds
gapspci_fixup_resources(struct pci_dev * dev)28b881bc46SGreg Kroah-Hartman static void gapspci_fixup_resources(struct pci_dev *dev)
291da177e4SLinus Torvalds {
30951a681bSPaul Mundt struct pci_channel *p = dev->sysdata;
31ace4b3fdSBjorn Helgaas struct resource res;
32ace4b3fdSBjorn Helgaas struct pci_bus_region region;
331da177e4SLinus Torvalds
341da177e4SLinus Torvalds printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev));
351da177e4SLinus Torvalds
361da177e4SLinus Torvalds switch (dev->device) {
371da177e4SLinus Torvalds case PCI_DEVICE_ID_SEGA_BBA:
381da177e4SLinus Torvalds /*
391da177e4SLinus Torvalds * We also assume that dev->devfn == 0
401da177e4SLinus Torvalds */
41b6c58b1dSPaul Mundt dev->resource[1].start = p->resources[0].start + 0x100;
421da177e4SLinus Torvalds dev->resource[1].end = dev->resource[1].start + 0x200 - 1;
43d556fcc1SPaul Mundt
44d556fcc1SPaul Mundt /*
45d556fcc1SPaul Mundt * This is not a normal BAR, prevent any attempts to move
46d556fcc1SPaul Mundt * the BAR, as this will result in a bus lock.
47d556fcc1SPaul Mundt */
48d556fcc1SPaul Mundt dev->resource[1].flags |= IORESOURCE_PCI_FIXED;
49d556fcc1SPaul Mundt
50a724605cSMagnus Damm /*
51a724605cSMagnus Damm * Redirect dma memory allocations to special memory window.
52ace4b3fdSBjorn Helgaas *
53ace4b3fdSBjorn Helgaas * If this GAPSPCI region were mapped by a BAR, the CPU
54ace4b3fdSBjorn Helgaas * phys_addr_t would be pci_resource_start(), and the bus
55ace4b3fdSBjorn Helgaas * address would be pci_bus_address(pci_resource_start()).
56ace4b3fdSBjorn Helgaas * But apparently there's no BAR mapping it, so we just
57ace4b3fdSBjorn Helgaas * "know" its CPU address is GAPSPCI_DMA_BASE.
58a724605cSMagnus Damm */
59ace4b3fdSBjorn Helgaas res.start = GAPSPCI_DMA_BASE;
60ace4b3fdSBjorn Helgaas res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1;
61ace4b3fdSBjorn Helgaas res.flags = IORESOURCE_MEM;
62ace4b3fdSBjorn Helgaas pcibios_resource_to_bus(dev->bus, ®ion, &res);
632436bdcdSChristoph Hellwig BUG_ON(dma_declare_coherent_memory(&dev->dev,
64ace4b3fdSBjorn Helgaas res.start,
65ace4b3fdSBjorn Helgaas region.start,
6682c5de0aSChristoph Hellwig resource_size(&res)));
671da177e4SLinus Torvalds break;
681da177e4SLinus Torvalds default:
691da177e4SLinus Torvalds printk("PCI: Failed resource fixup\n");
701da177e4SLinus Torvalds }
711da177e4SLinus Torvalds }
721da177e4SLinus Torvalds DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources);
731da177e4SLinus Torvalds
pcibios_map_platform_irq(const struct pci_dev * dev,u8 slot,u8 pin)742b8ff9f2SMatthew Minter int pcibios_map_platform_irq(const struct pci_dev *dev, u8 slot, u8 pin)
751da177e4SLinus Torvalds {
761da177e4SLinus Torvalds /*
771da177e4SLinus Torvalds * The interrupt routing semantics here are quite trivial.
781da177e4SLinus Torvalds *
791da177e4SLinus Torvalds * We basically only support one interrupt, so we only bother
801da177e4SLinus Torvalds * updating a device's interrupt line with this single shared
811da177e4SLinus Torvalds * interrupt. Keeps routing quite simple, doesn't it?
821da177e4SLinus Torvalds */
83959f85f8SPaul Mundt return GAPSPCI_IRQ;
841da177e4SLinus Torvalds }
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