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 }
63