lpfc_compat.h revision c44ce1737438d20ac58e808897e3f8eb015c66d3 
1/*******************************************************************
2 * This file is part of the Emulex Linux Device Driver for         *
3 * Fibre Channel Host Bus Adapters.                                *
4 * Copyright (C) 2004-2005 Emulex.  All rights reserved.           *
5 * EMULEX and SLI are trademarks of Emulex.                        *
6 * www.emulex.com                                                  *
7 *                                                                 *
8 * This program is free software; you can redistribute it and/or   *
9 * modify it under the terms of version 2 of the GNU General       *
10 * Public License as published by the Free Software Foundation.    *
11 * This program is distributed in the hope that it will be useful. *
12 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
13 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
14 * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
15 * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
16 * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
17 * more details, a copy of which can be found in the file COPYING  *
18 * included with this package.                                     *
19 *******************************************************************/
20
21/*
22 * This file provides macros to aid compilation in the Linux 2.4 kernel
23 * over various platform architectures.
24 */
25
26/*******************************************************************
27Note: HBA's SLI memory contains little-endian LW.
28Thus to access it from a little-endian host,
29memcpy_toio() and memcpy_fromio() can be used.
30However on a big-endian host, copy 4 bytes at a time,
31using writel() and readl().
32 *******************************************************************/
33
34#if __BIG_ENDIAN
35
36static inline void
37lpfc_memcpy_to_slim(void __iomem *dest, void *src, unsigned int bytes)
38{
39	uint32_t __iomem *dest32;
40	uint32_t *src32;
41	unsigned int four_bytes;
42
43
44	dest32  = (uint32_t __iomem *) dest;
45	src32  = (uint32_t *) src;
46
47	/* write input bytes, 4 bytes at a time */
48	for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
49		writel( *src32, dest32);
50		readl(dest32); /* flush */
51		dest32++;
52		src32++;
53	}
54
55	return;
56}
57
58static inline void
59lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
60{
61	uint32_t *dest32;
62	uint32_t __iomem *src32;
63	unsigned int four_bytes;
64
65
66	dest32  = (uint32_t *) dest;
67	src32  = (uint32_t __iomem *) src;
68
69	/* read input bytes, 4 bytes at a time */
70	for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
71		*dest32 = readl( src32);
72		dest32++;
73		src32++;
74	}
75
76	return;
77}
78
79#else
80
81static inline void
82lpfc_memcpy_to_slim( void __iomem *dest, void *src, unsigned int bytes)
83{
84	/* actually returns 1 byte past dest */
85	memcpy_toio( dest, src, bytes);
86}
87
88static inline void
89lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
90{
91	/* actually returns 1 byte past dest */
92	memcpy_fromio( dest, src, bytes);
93}
94
95#endif	/* __BIG_ENDIAN */
96