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