1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 * 33 * $Id: mthca_doorbell.h 1349 2004-12-16 21:09:43Z roland $ 34 */ 35 36 #include <linux/types.h> 37 38 #define MTHCA_RD_DOORBELL 0x00 39 #define MTHCA_SEND_DOORBELL 0x10 40 #define MTHCA_RECEIVE_DOORBELL 0x18 41 #define MTHCA_CQ_DOORBELL 0x20 42 #define MTHCA_EQ_DOORBELL 0x28 43 44 #if BITS_PER_LONG == 64 45 /* 46 * Assume that we can just write a 64-bit doorbell atomically. s390 47 * actually doesn't have writeq() but S/390 systems don't even have 48 * PCI so we won't worry about it. 49 */ 50 51 #define MTHCA_DECLARE_DOORBELL_LOCK(name) 52 #define MTHCA_INIT_DOORBELL_LOCK(ptr) do { } while (0) 53 #define MTHCA_GET_DOORBELL_LOCK(ptr) (NULL) 54 55 static inline void mthca_write64_raw(__be64 val, void __iomem *dest) 56 { 57 __raw_writeq((__force u64) val, dest); 58 } 59 60 static inline void mthca_write64(u32 val[2], void __iomem *dest, 61 spinlock_t *doorbell_lock) 62 { 63 __raw_writeq(*(u64 *) val, dest); 64 } 65 66 static inline void mthca_write_db_rec(u32 val[2], u32 *db) 67 { 68 *(u64 *) db = *(u64 *) val; 69 } 70 71 #else 72 73 /* 74 * Just fall back to a spinlock to protect the doorbell if 75 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit 76 * MMIO writes. 77 */ 78 79 #define MTHCA_DECLARE_DOORBELL_LOCK(name) spinlock_t name; 80 #define MTHCA_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr) 81 #define MTHCA_GET_DOORBELL_LOCK(ptr) (ptr) 82 83 static inline void mthca_write64_raw(__be64 val, void __iomem *dest) 84 { 85 __raw_writel(((__force u32 *) &val)[0], dest); 86 __raw_writel(((__force u32 *) &val)[1], dest + 4); 87 } 88 89 static inline void mthca_write64(u32 val[2], void __iomem *dest, 90 spinlock_t *doorbell_lock) 91 { 92 unsigned long flags; 93 94 spin_lock_irqsave(doorbell_lock, flags); 95 __raw_writel(val[0], dest); 96 __raw_writel(val[1], dest + 4); 97 spin_unlock_irqrestore(doorbell_lock, flags); 98 } 99 100 static inline void mthca_write_db_rec(u32 val[2], u32 *db) 101 { 102 db[0] = val[0]; 103 wmb(); 104 db[1] = val[1]; 105 } 106 107 #endif 108