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 }