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84 lines
2.4 KiB
84 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sh/drivers/pci/fixups-dreamcast.c |
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* |
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* PCI fixups for the Sega Dreamcast |
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* |
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* Copyright (C) 2001, 2002 M. R. Brown |
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* Copyright (C) 2002, 2003, 2006 Paul Mundt |
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* |
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* This file originally bore the message (with enclosed-$): |
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* Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp |
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* Dreamcast PCI: Supports SEGA Broadband Adaptor only. |
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*/ |
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/param.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/irq.h> |
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#include <linux/pci.h> |
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#include <linux/dma-map-ops.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#include <mach/pci.h> |
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static void gapspci_fixup_resources(struct pci_dev *dev) |
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{ |
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struct pci_channel *p = dev->sysdata; |
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struct resource res; |
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struct pci_bus_region region; |
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printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev)); |
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switch (dev->device) { |
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case PCI_DEVICE_ID_SEGA_BBA: |
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/* |
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* We also assume that dev->devfn == 0 |
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*/ |
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dev->resource[1].start = p->resources[0].start + 0x100; |
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dev->resource[1].end = dev->resource[1].start + 0x200 - 1; |
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/* |
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* This is not a normal BAR, prevent any attempts to move |
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* the BAR, as this will result in a bus lock. |
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*/ |
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dev->resource[1].flags |= IORESOURCE_PCI_FIXED; |
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/* |
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* Redirect dma memory allocations to special memory window. |
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* |
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* If this GAPSPCI region were mapped by a BAR, the CPU |
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* phys_addr_t would be pci_resource_start(), and the bus |
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* address would be pci_bus_address(pci_resource_start()). |
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* But apparently there's no BAR mapping it, so we just |
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* "know" its CPU address is GAPSPCI_DMA_BASE. |
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*/ |
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res.start = GAPSPCI_DMA_BASE; |
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res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1; |
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res.flags = IORESOURCE_MEM; |
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pcibios_resource_to_bus(dev->bus, ®ion, &res); |
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BUG_ON(dma_declare_coherent_memory(&dev->dev, |
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res.start, |
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region.start, |
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resource_size(&res))); |
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break; |
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default: |
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printk("PCI: Failed resource fixup\n"); |
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} |
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} |
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DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources); |
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int pcibios_map_platform_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
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{ |
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/* |
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* The interrupt routing semantics here are quite trivial. |
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* |
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* We basically only support one interrupt, so we only bother |
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* updating a device's interrupt line with this single shared |
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* interrupt. Keeps routing quite simple, doesn't it? |
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*/ |
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return GAPSPCI_IRQ; |
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}
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