71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/*
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* arch/sh/drivers/pci/dma-dreamcast.c
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*
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* PCI DMA support 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 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 <linux/device.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 int gapspci_dma_used = 0;
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void *dreamcast_consistent_alloc(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag)
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{
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unsigned long buf;
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if (dev && dev->bus != &pci_bus_type)
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return NULL;
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if (gapspci_dma_used + size > GAPSPCI_DMA_SIZE)
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return ERR_PTR(-EINVAL);
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buf = GAPSPCI_DMA_BASE + gapspci_dma_used;
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gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
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*dma_handle = (dma_addr_t)buf;
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buf = P2SEGADDR(buf);
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/* Flush the dcache before we hand off the buffer */
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dma_cache_wback_inv((void *)buf, size);
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return (void *)buf;
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}
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int dreamcast_consistent_free(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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if (dev && dev->bus != &pci_bus_type)
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return -EINVAL;
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/* XXX */
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gapspci_dma_used = 0;
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return 0;
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}
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