1 /* 2 * Copyright (c) 2012 Mellanox Technologies, 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 34 #ifndef DOORBELL_H 35 #define DOORBELL_H 36 37 #include <stdint.h> 38 #include "mlx5.h" 39 40 #if SIZEOF_LONG == 8 41 42 #if __BYTE_ORDER == __LITTLE_ENDIAN 43 # define MLX5_PAIR_TO_64(val) ((uint64_t) val[1] << 32 | val[0]) 44 #elif __BYTE_ORDER == __BIG_ENDIAN 45 # define MLX5_PAIR_TO_64(val) ((uint64_t) val[0] << 32 | val[1]) 46 #else 47 # error __BYTE_ORDER not defined 48 #endif 49 50 static inline void mlx5_write64(uint32_t val[2], void *dest, struct mlx5_spinlock *lock) 51 { 52 *(volatile uint64_t *)dest = MLX5_PAIR_TO_64(val); 53 } 54 55 #else 56 57 static inline void mlx5_write64(uint32_t val[2], void *dest, struct mlx5_spinlock *lock) 58 { 59 mlx5_spin_lock(lock); 60 *(volatile uint32_t *)dest = val[0]; 61 *(volatile uint32_t *)(dest + 4) = val[1]; 62 mlx5_spin_unlock(lock); 63 } 64 65 #endif 66 67 #endif /* DOORBELL_H */ 68