1/*
2 * Copyright (c) 2006-2007 Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses.  You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 *     Redistribution and use in source and binary forms, with or
11 *     without modification, are permitted provided that the following
12 *     conditions are met:
13 *
14 *      - Redistributions of source code must retain the above
15 *        copyright notice, this list of conditions and the following
16 *        disclaimer.
17 *
18 *      - Redistributions in binary form must reproduce the above
19 *        copyright notice, this list of conditions and the following
20 *        disclaimer in the documentation and/or other materials
21 *        provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/pci.h>
34#include "wc.h"
35
36#if defined(__i386__) || defined(__x86_64__)
37
38pgprot_t pgprot_wc(pgprot_t _prot)
39{
40	return pgprot_writecombine(_prot);
41}
42
43int mlx4_wc_enabled(void)
44{
45	return 1;
46}
47
48#elif defined(CONFIG_PPC64)
49
50pgprot_t pgprot_wc(pgprot_t _prot)
51{
52	return __pgprot((pgprot_val(_prot) | _PAGE_NO_CACHE) &
53				     ~(pgprot_t)_PAGE_GUARDED);
54}
55
56int mlx4_wc_enabled(void)
57{
58	return 1;
59}
60
61#else	/* !(defined(__i386__) || defined(__x86_64__)) */
62
63pgprot_t pgprot_wc(pgprot_t _prot)
64{
65	return pgprot_noncached(_prot);
66}
67
68int mlx4_wc_enabled(void)
69{
70	return 0;
71}
72
73#endif
74