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TOMOYO Linux Cross Reference
Linux/include/linux/mlx4/doorbell.h

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  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 #ifndef MLX4_DOORBELL_H
 36 #define MLX4_DOORBELL_H
 37 
 38 #include <linux/types.h>
 39 #include <linux/io.h>
 40 
 41 #define MLX4_SEND_DOORBELL    0x14
 42 #define MLX4_CQ_DOORBELL      0x20
 43 
 44 #if BITS_PER_LONG == 64
 45 /*
 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.
 49  */
 50 
 51 #define MLX4_DECLARE_DOORBELL_LOCK(name)
 52 #define MLX4_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
 53 #define MLX4_GET_DOORBELL_LOCK(ptr)      (NULL)
 54 
 55 static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
 56                                 spinlock_t *doorbell_lock)
 57 {
 58         __raw_writeq(*(u64 *) val, dest);
 59 }
 60 
 61 #else
 62 
 63 /*
 64  * Just fall back to a spinlock to protect the doorbell if
 65  * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
 66  * MMIO writes.
 67  */
 68 
 69 #define MLX4_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
 70 #define MLX4_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)
 71 #define MLX4_GET_DOORBELL_LOCK(ptr)      (ptr)
 72 
 73 static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
 74                                 spinlock_t *doorbell_lock)
 75 {
 76         unsigned long flags;
 77 
 78         spin_lock_irqsave(doorbell_lock, flags);
 79         __raw_writel((__force u32) val[0], dest);
 80         __raw_writel((__force u32) val[1], dest + 4);
 81         spin_unlock_irqrestore(doorbell_lock, flags);
 82 }
 83 
 84 #endif
 85 
 86 #endif /* MLX4_DOORBELL_H */
 87 

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