1 /*
2  * Copyright (c) 2009 QLogic Corporation. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 
33 #include "qib.h"
34 
35 /**
36  * qib_pio_copy - copy data to MMIO space, in multiples of 32-bits
37  * @to: destination, in MMIO space (must be 64-bit aligned)
38  * @from: source (must be 64-bit aligned)
39  * @count: number of 32-bit quantities to copy
40  *
41  * Copy data from kernel space to MMIO space, in multiples of 32 bits at a
42  * time.  Order of access is not guaranteed, nor is a memory barrier
43  * performed afterwards.
44  */
45 void qib_pio_copy(void __iomem *to, const void *from, size_t count)
46 {
47 #ifdef CONFIG_64BIT
48 	u64 __iomem *dst = to;
49 	const u64 *src = from;
50 	const u64 *end = src + (count >> 1);
51 
52 	while (src < end)
53 		__raw_writeq(*src++, dst++);
54 	if (count & 1)
55 		__raw_writel(*(const u32 *)src, dst);
56 #else
57 	u32 __iomem *dst = to;
58 	const u32 *src = from;
59 	const u32 *end = src + count;
60 
61 	while (src < end)
62 		__raw_writel(*src++, dst++);
63 #endif
64 }
65