1 /* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * 6 * This software is available to you under a choice of one of two 7 * licenses. You may choose to be licensed under the terms of the GNU 8 * General Public License (GPL) Version 2, available from the file 9 * COPYING in the main directory of this source tree, or the 10 * OpenIB.org BSD license below: 11 * 12 * Redistribution and use in source and binary forms, with or 13 * without modification, are permitted provided that the following 14 * conditions are met: 15 * 16 * - Redistributions of source code must retain the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer. 19 * 20 * - Redistributions in binary form must reproduce the above 21 * copyright notice, this list of conditions and the following 22 * disclaimer in the documentation and/or other materials 23 * provided with the distribution. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 32 * SOFTWARE. 33 * 34 * $Id: mthca_doorbell.h 1349 2004-12-16 21:09:43Z roland $ 35 */ 36 37 #include <linux/types.h> 38 39 #define MTHCA_RD_DOORBELL 0x00 40 #define MTHCA_SEND_DOORBELL 0x10 41 #define MTHCA_RECEIVE_DOORBELL 0x18 42 #define MTHCA_CQ_DOORBELL 0x20 43 #define MTHCA_EQ_DOORBELL 0x28 44 45 #if BITS_PER_LONG == 64 46 /* 47 * Assume that we can just write a 64-bit doorbell atomically. s390 48 * actually doesn't have writeq() but S/390 systems don't even have 49 * PCI so we won't worry about it. 50 */ 51 52 #define MTHCA_DECLARE_DOORBELL_LOCK(name) 53 #define MTHCA_INIT_DOORBELL_LOCK(ptr) do { } while (0) 54 #define MTHCA_GET_DOORBELL_LOCK(ptr) (NULL) 55 56 static inline void mthca_write64_raw(__be64 val, void __iomem *dest) 57 { 58 __raw_writeq((__force u64) val, dest); 59 } 60 61 static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest, 62 spinlock_t *doorbell_lock) 63 { 64 __raw_writeq((__force u64) cpu_to_be64((u64) hi << 32 | lo), dest); 65 } 66 67 static inline void mthca_write_db_rec(__be32 val[2], __be32 *db) 68 { 69 *(u64 *) db = *(u64 *) val; 70 } 71 72 #else 73 74 /* 75 * Just fall back to a spinlock to protect the doorbell if 76 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit 77 * MMIO writes. 78 */ 79 80 #define MTHCA_DECLARE_DOORBELL_LOCK(name) spinlock_t name; 81 #define MTHCA_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr) 82 #define MTHCA_GET_DOORBELL_LOCK(ptr) (ptr) 83 84 static inline void mthca_write64_raw(__be64 val, void __iomem *dest) 85 { 86 __raw_writel(((__force u32 *) &val)[0], dest); 87 __raw_writel(((__force u32 *) &val)[1], dest + 4); 88 } 89 90 static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest, 91 spinlock_t *doorbell_lock) 92 { 93 unsigned long flags; 94 95 hi = (__force u32) cpu_to_be32(hi); 96 lo = (__force u32) cpu_to_be32(lo); 97 98 spin_lock_irqsave(doorbell_lock, flags); 99 __raw_writel(hi, dest); 100 __raw_writel(lo, dest + 4); 101 spin_unlock_irqrestore(doorbell_lock, flags); 102 } 103 104 static inline void mthca_write_db_rec(__be32 val[2], __be32 *db) 105 { 106 db[0] = val[0]; 107 wmb(); 108 db[1] = val[1]; 109 } 110 111 #endif 112