1/* 2 * Copyright (c) 2007 Cisco, Inc. 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#ifndef DOORBELL_H 34#define DOORBELL_H 35 36#ifdef __LP64__ 37#if __BYTE_ORDER == __LITTLE_ENDIAN 38# define MLX4_PAIR_TO_64(val) ((uint64_t) val[1] << 32 | val[0]) 39#elif __BYTE_ORDER == __BIG_ENDIAN 40# define MLX4_PAIR_TO_64(val) ((uint64_t) val[0] << 32 | val[1]) 41#else 42# error __BYTE_ORDER not defined 43#endif 44 45static inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset) 46{ 47 *(volatile uint64_t *) (ctx->uar + offset) = MLX4_PAIR_TO_64(val); 48} 49 50#else 51 52static inline void mlx4_write64(uint32_t val[2], struct mlx4_context *ctx, int offset) 53{ 54 pthread_spin_lock(&ctx->uar_lock); 55 *(volatile uint32_t *) (ctx->uar + offset) = val[0]; 56 *(volatile uint32_t *) (ctx->uar + offset + 4) = val[1]; 57 pthread_spin_unlock(&ctx->uar_lock); 58} 59 60#endif 61 62#endif /* DOORBELL_H */ 63