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 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_raw(__be64 val, void __iomem *dest) 55 { 56 __raw_writeq((__force u64) val, dest); 57 } 58 59 static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest, 60 spinlock_t *doorbell_lock) 61 { 62 __raw_writeq((__force u64) cpu_to_be64((u64) hi << 32 | lo), dest); 63 } 64 65 static inline void mthca_write_db_rec(__be32 val[2], __be32 *db) 66 { 67 *(u64 *) db = *(u64 *) val; 68 } 69 70 #else 71 72 /* 73 * Just fall back to a spinlock to protect the doorbell if 74 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit 75 * MMIO writes. 76 */ 77 78 #define MTHCA_DECLARE_DOORBELL_LOCK(name) spinlock_t name; 79 #define MTHCA_INIT_DOORBELL_LOCK(ptr) spin_lock_init(ptr) 80 #define MTHCA_GET_DOORBELL_LOCK(ptr) (ptr) 81 82 static inline void mthca_write64_raw(__be64 val, void __iomem *dest) 83 { 84 __raw_writel(((__force u32 *) &val)[0], dest); 85 __raw_writel(((__force u32 *) &val)[1], dest + 4); 86 } 87 88 static inline void mthca_write64(u32 hi, u32 lo, void __iomem *dest, 89 spinlock_t *doorbell_lock) 90 { 91 unsigned long flags; 92 93 hi = (__force u32) cpu_to_be32(hi); 94 lo = (__force u32) cpu_to_be32(lo); 95 96 spin_lock_irqsave(doorbell_lock, flags); 97 __raw_writel(hi, dest); 98 __raw_writel(lo, dest + 4); 99 spin_unlock_irqrestore(doorbell_lock, flags); 100 } 101 102 static inline void mthca_write_db_rec(__be32 val[2], __be32 *db) 103 { 104 db[0] = val[0]; 105 wmb(); 106 db[1] = val[1]; 107 } 108 109 #endif 110