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/*
* arch/sh/drivers/pci/dma-dreamcast.c
*
* PCI DMA support for the Sega Dreamcast
*
* Copyright (C) 2001, 2002 M. R. Brown
* Copyright (C) 2002, 2003 Paul Mundt
*
* This file originally bore the message (with enclosed-$):
* Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
* Dreamcast PCI: Supports SEGA Broadband Adaptor only.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
static int gapspci_dma_used = 0;
void *dreamcast_consistent_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
unsigned long buf;
if (dev && dev->bus != &pci_bus_type)
return NULL;
if (gapspci_dma_used + size > GAPSPCI_DMA_SIZE)
return ERR_PTR(-EINVAL);
buf = GAPSPCI_DMA_BASE + gapspci_dma_used;
gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
*dma_handle = (dma_addr_t)buf;
buf = P2SEGADDR(buf);
/* Flush the dcache before we hand off the buffer */
__flush_purge_region((void *)buf, size);
return (void *)buf;
}
int dreamcast_consistent_free(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
if (dev && dev->bus != &pci_bus_type)
return -EINVAL;
/* XXX */
gapspci_dma_used = 0;
return 0;
}
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