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lpfc_compat.h
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1 /*******************************************************************
2  * This file is part of the Emulex Linux Device Driver for *
3  * Fibre Channel Host Bus Adapters. *
4  * Copyright (C) 2004-2011 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 /*******************************************************************
27 Note: HBA's SLI memory contains little-endian LW.
28 Thus to access it from a little-endian host,
29 memcpy_toio() and memcpy_fromio() can be used.
30 However on a big-endian host, copy 4 bytes at a time,
31 using writel() and readl().
32  *******************************************************************/
33 #include <asm/byteorder.h>
34 
35 #ifdef __BIG_ENDIAN
36 
37 static inline void
38 lpfc_memcpy_to_slim(void __iomem *dest, void *src, unsigned int bytes)
39 {
40  uint32_t __iomem *dest32;
41  uint32_t *src32;
42  unsigned int four_bytes;
43 
44 
45  dest32 = (uint32_t __iomem *) dest;
46  src32 = (uint32_t *) src;
47 
48  /* write input bytes, 4 bytes at a time */
49  for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
50  writel( *src32, dest32);
51  readl(dest32); /* flush */
52  dest32++;
53  src32++;
54  }
55 
56  return;
57 }
58 
59 static inline void
60 lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
61 {
62  uint32_t *dest32;
63  uint32_t __iomem *src32;
64  unsigned int four_bytes;
65 
66 
67  dest32 = (uint32_t *) dest;
68  src32 = (uint32_t __iomem *) src;
69 
70  /* read input bytes, 4 bytes at a time */
71  for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
72  *dest32 = readl( src32);
73  dest32++;
74  src32++;
75  }
76 
77  return;
78 }
79 
80 #else
81 
82 static inline void
83 lpfc_memcpy_to_slim( void __iomem *dest, void *src, unsigned int bytes)
84 {
85  /* convert bytes in argument list to word count for copy function */
86  __iowrite32_copy(dest, src, bytes / sizeof(uint32_t));
87 }
88 
89 static inline void
90 lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
91 {
92  /* actually returns 1 byte past dest */
93  memcpy_fromio( dest, src, bytes);
94 }
95 
96 #endif /* __BIG_ENDIAN */