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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2004 Topspin Communications. All rights reserved. | |
cd4e8fb4 | 3 | * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. |
2a1d9b7f | 4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
1da177e4 LT |
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 | ||
ef416a33 MT |
56 | static inline void mthca_write64_raw(__be64 val, void __iomem *dest) |
57 | { | |
58 | __raw_writeq((__force u64) val, dest); | |
59 | } | |
60 | ||
1da177e4 LT |
61 | static inline void mthca_write64(u32 val[2], void __iomem *dest, |
62 | spinlock_t *doorbell_lock) | |
63 | { | |
64 | __raw_writeq(*(u64 *) val, dest); | |
65 | } | |
66 | ||
67 | static inline void mthca_write_db_rec(u32 val[2], u32 *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 | ||
ef416a33 MT |
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 | ||
1da177e4 LT |
90 | static inline void mthca_write64(u32 val[2], void __iomem *dest, |
91 | spinlock_t *doorbell_lock) | |
92 | { | |
93 | unsigned long flags; | |
94 | ||
95 | spin_lock_irqsave(doorbell_lock, flags); | |
96 | __raw_writel(val[0], dest); | |
97 | __raw_writel(val[1], dest + 4); | |
98 | spin_unlock_irqrestore(doorbell_lock, flags); | |
99 | } | |
100 | ||
101 | static inline void mthca_write_db_rec(u32 val[2], u32 *db) | |
102 | { | |
103 | db[0] = val[0]; | |
104 | wmb(); | |
105 | db[1] = val[1]; | |
106 | } | |
107 | ||
108 | #endif |