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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a724605cb7
This patch makes the dreamcast use the recently added declared coherent memory functions to point out the memory window suitable for dma. Apart from cleaning up, this gives the dreamcast a proper memory allocator for pci dma memory. Signed-off-by: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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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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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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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-mapping.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/mach/pci.h>
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static void __init gapspci_fixup_resources(struct pci_dev *dev)
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{
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struct pci_channel *p = board_pci_channels;
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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->io_resource->start + 0x100;
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dev->resource[1].end = dev->resource[1].start + 0x200 - 1;
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/*
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* Redirect dma memory allocations to special memory window.
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*/
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BUG_ON(!dma_declare_coherent_memory(&dev->dev,
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GAPSPCI_DMA_BASE,
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GAPSPCI_DMA_BASE,
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GAPSPCI_DMA_SIZE,
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DMA_MEMORY_MAP |
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DMA_MEMORY_EXCLUSIVE));
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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 __init pcibios_map_platform_irq(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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