drivers/infiniband/hw/ipath/ipath_wc_ppc64.c

   1 /*
   2  * Copyright (c) 2006, 2007 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 "ipath_kernel.h"
  39
  40 /**
  41  * ipath_enable_wc - enable write combining for MMIO writes to the device
  42  * @dd: infinipath device
  43  *
  44  * Nothing to do on PowerPC, so just return without error.
  45  */
  46 int ipath_enable_wc(struct ipath_devdata *dd)
  47 {
  48         return 0;
  49 }
  50
  51 /**
  52  * ipath_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 ipath_unordered_wc(void)
  60 {
  61         return 1;
  62 }