1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This software is available to you under a choice of one of two
5*4882a593Smuzhiyun * licenses. You may choose to be licensed under the terms of the GNU
6*4882a593Smuzhiyun * General Public License (GPL) Version 2, available from the file
7*4882a593Smuzhiyun * COPYING in the main directory of this source tree, or the
8*4882a593Smuzhiyun * OpenIB.org BSD license below:
9*4882a593Smuzhiyun *
10*4882a593Smuzhiyun * Redistribution and use in source and binary forms, with or
11*4882a593Smuzhiyun * without modification, are permitted provided that the following
12*4882a593Smuzhiyun * conditions are met:
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * - Redistributions of source code must retain the above
15*4882a593Smuzhiyun * copyright notice, this list of conditions and the following
16*4882a593Smuzhiyun * disclaimer.
17*4882a593Smuzhiyun *
18*4882a593Smuzhiyun * - Redistributions in binary form must reproduce the above
19*4882a593Smuzhiyun * copyright notice, this list of conditions and the following
20*4882a593Smuzhiyun * disclaimer in the documentation and/or other materials
21*4882a593Smuzhiyun * provided with the distribution.
22*4882a593Smuzhiyun *
23*4882a593Smuzhiyun * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24*4882a593Smuzhiyun * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25*4882a593Smuzhiyun * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26*4882a593Smuzhiyun * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27*4882a593Smuzhiyun * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28*4882a593Smuzhiyun * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29*4882a593Smuzhiyun * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30*4882a593Smuzhiyun * SOFTWARE.
31*4882a593Smuzhiyun */
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun /*
34*4882a593Smuzhiyun * This file is conditionally built on PowerPC only. Otherwise weak symbol
35*4882a593Smuzhiyun * versions of the functions exported from here are used.
36*4882a593Smuzhiyun */
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun #include "qib.h"
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun /**
41*4882a593Smuzhiyun * qib_enable_wc - enable write combining for MMIO writes to the device
42*4882a593Smuzhiyun * @dd: qlogic_ib device
43*4882a593Smuzhiyun *
44*4882a593Smuzhiyun * Nothing to do on PowerPC, so just return without error.
45*4882a593Smuzhiyun */
qib_enable_wc(struct qib_devdata * dd)46*4882a593Smuzhiyun int qib_enable_wc(struct qib_devdata *dd)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun return 0;
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun /**
52*4882a593Smuzhiyun * qib_unordered_wc - indicate whether write combining is unordered
53*4882a593Smuzhiyun *
54*4882a593Smuzhiyun * Because our performance depends on our ability to do write
55*4882a593Smuzhiyun * combining mmio writes in the most efficient way, we need to
56*4882a593Smuzhiyun * know if we are on a processor that may reorder stores when
57*4882a593Smuzhiyun * write combining.
58*4882a593Smuzhiyun */
qib_unordered_wc(void)59*4882a593Smuzhiyun int qib_unordered_wc(void)
60*4882a593Smuzhiyun {
61*4882a593Smuzhiyun return 1;
62*4882a593Smuzhiyun }
63