[linux.git] / include / linux / mlx4 / doorbell.h

/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef MLX4_DOORBELL_H
#define MLX4_DOORBELL_H

#include <linux/types.h>
#include <linux/io.h>

#define MLX4_SEND_DOORBELL    0x14
#define MLX4_CQ_DOORBELL      0x20

#if BITS_PER_LONG == 64
/*
 * Assume that we can just write a 64-bit doorbell atomically.  s390
 * actually doesn't have writeq() but S/390 systems don't even have
 * PCI so we won't worry about it.
 */

#define MLX4_DECLARE_DOORBELL_LOCK(name)
#define MLX4_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
#define MLX4_GET_DOORBELL_LOCK(ptr)      (NULL)

static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
				spinlock_t *doorbell_lock)
{
	__raw_writeq(*(u64 *) val, dest);
}

#else

/*
 * Just fall back to a spinlock to protect the doorbell if
 * BITS_PER_LONG is 32 -- there's no portable way to do atomic 64-bit
 * MMIO writes.
 */

#define MLX4_DECLARE_DOORBELL_LOCK(name) spinlock_t name;
#define MLX4_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)
#define MLX4_GET_DOORBELL_LOCK(ptr)      (ptr)

static inline void mlx4_write64(__be32 val[2], void __iomem *dest,
				spinlock_t *doorbell_lock)
{
	unsigned long flags;

	spin_lock_irqsave(doorbell_lock, flags);
	__raw_writel((__force u32) val[0], dest);
	__raw_writel((__force u32) val[1], dest + 4);
	spin_unlock_irqrestore(doorbell_lock, flags);
}

#endif

#endif /* MLX4_DOORBELL_H */
Commit	Line	Data
225c7b1f RD	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
225c7b1f RD	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
225c7b1f RD	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 */