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/arch/sh/drivers/pci/dma-dreamcast.c

https://bitbucket.org/evzijst/gittest
C | 71 lines | 37 code | 16 blank | 18 comment | 7 complexity | ba6a39b83cb94a5c9ef89629a1425af0 MD5 | raw file
 1/*
 2 * arch/sh/pci/dma-dreamcast.c
 3 *
 4 * PCI DMA support for the Sega Dreamcast
 5 *
 6 * Copyright (C) 2001, 2002  M. R. Brown
 7 * Copyright (C) 2002, 2003  Paul Mundt
 8 *
 9 * This file originally bore the message (with enclosed-$):
10 *	Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
11 *	Dreamcast PCI: Supports SEGA Broadband Adaptor only.
12 *
13 * This file is subject to the terms and conditions of the GNU General Public
14 * License.  See the file "COPYING" in the main directory of this archive
15 * for more details.
16 */
17
18#include <linux/config.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/param.h>
22#include <linux/interrupt.h>
23#include <linux/init.h>
24#include <linux/irq.h>
25#include <linux/pci.h>
26#include <linux/dma-mapping.h>
27#include <linux/device.h>
28
29#include <asm/io.h>
30#include <asm/irq.h>
31#include <asm/mach/pci.h>
32
33static int gapspci_dma_used = 0;
34
35void *dreamcast_consistent_alloc(struct device *dev, size_t size,
36				 dma_addr_t *dma_handle, int flag)
37{
38	unsigned long buf;
39
40	if (dev && dev->bus != &pci_bus_type)
41		return NULL;
42
43	if (gapspci_dma_used + size > GAPSPCI_DMA_SIZE)
44		return ERR_PTR(-EINVAL);
45
46	buf = GAPSPCI_DMA_BASE + gapspci_dma_used;
47
48	gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
49
50	*dma_handle = (dma_addr_t)buf;
51
52	buf = P2SEGADDR(buf);
53
54	/* Flush the dcache before we hand off the buffer */
55	dma_cache_wback_inv((void *)buf, size);
56
57	return (void *)buf;
58}
59
60int dreamcast_consistent_free(struct device *dev, size_t size,
61			 void *vaddr, dma_addr_t dma_handle)
62{
63	if (dev && dev->bus != &pci_bus_type)
64		return -EINVAL;
65
66	/* XXX */
67	gapspci_dma_used = 0;
68
69	return 0;
70}
71