drivers/scsi/lpfc/lpfc_compat.h

   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 */