2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
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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:
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12 * without modification, are permitted provided that the following
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24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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33 * $Id: mthca_doorbell.h 1349 2004-12-16 21:09:43Z roland $
36 #include <linux/types.h>
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
44 #if BITS_PER_LONG == 64
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.
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)
55 static inline void mthca_write64_raw(__be64 val, void __iomem *dest)
57 __raw_writeq((__force u64) val, dest);
60 static inline void mthca_write64(u32 val[2], void __iomem *dest,
61 spinlock_t *doorbell_lock)
63 __raw_writeq(*(u64 *) val, dest);
66 static inline void mthca_write_db_rec(u32 val[2], u32 *db)
68 *(u64 *) db = *(u64 *) val;
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
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)
83 static inline void mthca_write64_raw(__be64 val, void __iomem *dest)
85 __raw_writel(((__force u32 *) &val)[0], dest);
86 __raw_writel(((__force u32 *) &val)[1], dest + 4);
89 static inline void mthca_write64(u32 val[2], void __iomem *dest,
90 spinlock_t *doorbell_lock)
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);
100 static inline void mthca_write_db_rec(u32 val[2], u32 *db)