LXR linux/drivers/infiniband/hw/qib/qib_wc

   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 */
  46int 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 */
  59int qib_unordered_wc(void)
  60{
  61        return 1;
  62}
  63