drivers/scsi/lpfc/lpfc_compat.h

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Enterprise Fibre Channel Host Bus Adapters.                     *
   4  * Refer to the README file included with this package for         *
   5  * driver version and adapter support.                             *
   6  * Copyright (C) 2004 Emulex Corporation.                          *
   7  * www.emulex.com                                                  *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of the GNU General Public License     *
  11  * as published by the Free Software Foundation; either version 2  *
  12  * of the License, or (at your option) any later version.          *
  13  *                                                                 *
  14  * This program is distributed in the hope that it will be useful, *
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of  *
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   *
  17  * GNU General Public License for more details, a copy of which    *
  18  * can be found in the file COPYING included with this package.    *
  19  *******************************************************************/
  20
  21 /*
  22  * $Id: lpfc_compat.h 1.32 2005/01/25 17:51:45EST sf_support Exp  $
  23  *
  24  * This file provides macros to aid compilation in the Linux 2.4 kernel
  25  * over various platform architectures.
  26  */
  27
  28 /*******************************************************************
  29 Note: HBA's SLI memory contains little-endian LW.
  30 Thus to access it from a little-endian host,
  31 memcpy_toio() and memcpy_fromio() can be used.
  32 However on a big-endian host, copy 4 bytes at a time,
  33 using writel() and readl().
  34  *******************************************************************/
  35
  36 #if __BIG_ENDIAN
  37
  38 static inline void
  39 lpfc_memcpy_to_slim(void __iomem *dest, void *src, unsigned int bytes)
  40 {
  41         uint32_t __iomem *dest32;
  42         uint32_t *src32;
  43         unsigned int four_bytes;
  44
  45
  46         dest32  = (uint32_t __iomem *) dest;
  47         src32  = (uint32_t *) src;
  48
  49         /* write input bytes, 4 bytes at a time */
  50         for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
  51                 writel( *src32, dest32);
  52                 readl(dest32); /* flush */
  53                 dest32++;
  54                 src32++;
  55         }
  56
  57         return;
  58 }
  59
  60 static inline void
  61 lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
  62 {
  63         uint32_t *dest32;
  64         uint32_t __iomem *src32;
  65         unsigned int four_bytes;
  66
  67
  68         dest32  = (uint32_t *) dest;
  69         src32  = (uint32_t __iomem *) src;
  70
  71         /* read input bytes, 4 bytes at a time */
  72         for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
  73                 *dest32 = readl( src32);
  74                 dest32++;
  75                 src32++;
  76         }
  77
  78         return;
  79 }
  80
  81 #else
  82
  83 static inline void
  84 lpfc_memcpy_to_slim( void __iomem *dest, void *src, unsigned int bytes)
  85 {
  86         /* actually returns 1 byte past dest */
  87         memcpy_toio( dest, src, bytes);
  88 }
  89
  90 static inline void
  91 lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
  92 {
  93         /* actually returns 1 byte past dest */
  94         memcpy_fromio( dest, src, bytes);
  95 }
  96
  97 #endif  /* __BIG_ENDIAN */