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,v 1.1.1.1 2007/08/03 18:52:32 Exp $
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
56static inline void mthca_write64_raw(__be64 val, void __iomem *dest)
57{
58	__raw_writeq((__force u64) val, dest);
59}
60
61static inline void mthca_write64(__be32 val[2], void __iomem *dest,
62				 spinlock_t *doorbell_lock)
63{
64	__raw_writeq(*(u64 *) val, dest);
65}
66
67static 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
84static 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
90static inline void mthca_write64(__be32 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((__force u32) val[0], dest);
97	__raw_writel((__force u32) val[1], dest + 4);
98	spin_unlock_irqrestore(doorbell_lock, flags);
99}
100
101static inline void mthca_write_db_rec(__be32 val[2], __be32 *db)
102{
103	db[0] = val[0];
104	wmb();
105	db[1] = val[1];
106}
107
108#endif
109