1 /*
2 * Copyright (c) 2006, 2007, 2008 QLogic Corporation. 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 /*
34 * This file is conditionally built on PowerPC only. Otherwise weak symbol
35 * versions of the functions exported from here are used.
36 */
37
38 #include "qib.h"
39
40 /**
41 * qib_enable_wc - enable write combining for MMIO writes to the device
42 * @dd: qlogic_ib device
43 *
44 * Nothing to do on PowerPC, so just return without error.
45 */
46 int qib_enable_wc(struct qib_devdata *dd)
47 {
48 return 0;
49 }
50
51 /**
52 * qib_unordered_wc - indicate whether write combining is unordered
53 *
54 * Because our performance depends on our ability to do write
55 * combining mmio writes in the most efficient way, we need to
56 * know if we are on a processor that may reorder stores when
57 * write combining.
58 */
59 int qib_unordered_wc(void)
60 {
61 return 1;
62 }