1 /* 2 * Copyright (c) 2004 Topspin Communications. 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 * $Id: mthca_doorbell.h 1349 2004-12-16 21:09:43Z roland $ 33 */ 34 35 #include <linux/types.h> 36 37 #define MTHCA_RD_DOORBELL 0x00 38 #define MTHCA_SEND_DOORBELL 0x10 39 #define MTHCA_RECEIVE_DOORBELL 0x18 40 #define MTHCA_CQ_DOORBELL 0x20 41 #define MTHCA_EQ_DOORBELL 0x28 42 43 #if BITS_PER_LONG == 64 44 /* 45 * Assume that we can just write a 64-bit doorbell atomically. s390 46 * actually doesn't have writeq() but S/390 systems don't even have 47 * PCI so we won't worry about it. 48 */ 49 50 #define MTHCA_DECLARE_DOORBELL_LOCK(name) 51 #define MTHCA_INIT_DOORBELL_LOCK(ptr) do { } while (0) 52 #define MTHCA_GET_DOORBELL_LOCK(ptr) (NULL) 53 54 static inline void mthca_write64(u32 val[2], void __iomem *dest, 55 spinlock_t *doorbell_lock) 56 { 57 __raw_writeq(*(u64 *) val, dest); 58 } 59 60 static inline void mthca_write_db_rec(u32 val[2], u32 *db) 61 { 62 *(u64 *) db = *(u64 *) val; 63 } 64 65 #else 66 67 /* 68 * Just fall back to a spinlock to protect the doorbell if 69 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit 70 * MMIO writes. 71 */ 72 73 #define MTHCA_DECLARE_DOORBELL_LOCK(name) spinlock_t name; 74 #define MTHCA_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr) 75 #define MTHCA_GET_DOORBELL_LOCK(ptr) (ptr) 76 77 static inline void mthca_write64(u32 val[2], void __iomem *dest, 78 spinlock_t *doorbell_lock) 79 { 80 unsigned long flags; 81 82 spin_lock_irqsave(doorbell_lock, flags); 83 __raw_writel(val[0], dest); 84 __raw_writel(val[1], dest + 4); 85 spin_unlock_irqrestore(doorbell_lock, flags); 86 } 87 88 static inline void mthca_write_db_rec(u32 val[2], u32 *db) 89 { 90 db[0] = val[0]; 91 wmb(); 92 db[1] = val[1]; 93 } 94 95 #endif 96