hw/qib/qib_wc_ppc64.c

0001 /*
0002  * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved.
0003  *
0004  * This software is available to you under a choice of one of two
0005  * licenses.  You may choose to be licensed under the terms of the GNU
0006  * General Public License (GPL) Version 2, available from the file
0007  * COPYING in the main directory of this source tree, or the
0008  * OpenIB.org BSD license below:
0009  *
0010  *     Redistribution and use in source and binary forms, with or
0011  *     without modification, are permitted provided that the following
0012  *     conditions are met:
0013  *
0014  *      - Redistributions of source code must retain the above
0015  *        copyright notice, this list of conditions and the following
0016  *        disclaimer.
0017  *
0018  *      - Redistributions in binary form must reproduce the above
0019  *        copyright notice, this list of conditions and the following
0020  *        disclaimer in the documentation and/or other materials
0021  *        provided with the distribution.
0022  *
0023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
0024  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
0025  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
0026  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
0027  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
0028  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
0029  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0030  * SOFTWARE.
0031  */
0032
0033 /*
0034  * This file is conditionally built on PowerPC only.  Otherwise weak symbol
0035  * versions of the functions exported from here are used.
0036  */
0037
0038 #include "qib.h"
0039
0040 /**
0041  * qib_enable_wc - enable write combining for MMIO writes to the device
0042  * @dd: qlogic_ib device
0043  *
0044  * Nothing to do on PowerPC, so just return without error.
0045  */
0046 int qib_enable_wc(struct qib_devdata *dd)
0047 {
0048     return 0;
0049 }
0050
0051 /**
0052  * qib_unordered_wc - indicate whether write combining is unordered
0053  *
0054  * Because our performance depends on our ability to do write
0055  * combining mmio writes in the most efficient way, we need to
0056  * know if we are on a processor that may reorder stores when
0057  * write combining.
0058  */
0059 int qib_unordered_wc(void)
0060 {
0061     return 1;
0062 }