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) 2017 Broadcom. All Rights Reserved. The term      *
   5  * “Broadcom” refers to Broadcom Limited and/or its subsidiaries.  *
   6  * Copyright (C) 2004-2011 Emulex.  All rights reserved.           *
   7  * EMULEX and SLI are trademarks of Emulex.                        *
   8  * www.broadcom.com                                                *
   9  *                                                                 *
  10  * This program is free software; you can redistribute it and/or   *
  11  * modify it under the terms of version 2 of the GNU General       *
  12  * Public License as published by the Free Software Foundation.    *
  13  * This program is distributed in the hope that it will be useful. *
  14  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  15  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  16  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  17  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  18  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  19  * more details, a copy of which can be found in the file COPYING  *
  20  * included with this package.                                     *
  21  *******************************************************************/
  22
  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 #include <asm/byteorder.h>
  36
  37 #ifdef __BIG_ENDIAN
  38
  39 static inline void
  40 lpfc_memcpy_to_slim(void __iomem *dest, void *src, unsigned int bytes)
  41 {
  42         uint32_t __iomem *dest32;
  43         uint32_t *src32;
  44         unsigned int four_bytes;
  45
  46
  47         dest32  = (uint32_t __iomem *) dest;
  48         src32  = (uint32_t *) src;
  49
  50         /* write input bytes, 4 bytes at a time */
  51         for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
  52                 writel( *src32, dest32);
  53                 readl(dest32); /* flush */
  54                 dest32++;
  55                 src32++;
  56         }
  57
  58         return;
  59 }
  60
  61 static inline void
  62 lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
  63 {
  64         uint32_t *dest32;
  65         uint32_t __iomem *src32;
  66         unsigned int four_bytes;
  67
  68
  69         dest32  = (uint32_t *) dest;
  70         src32  = (uint32_t __iomem *) src;
  71
  72         /* read input bytes, 4 bytes at a time */
  73         for (four_bytes = bytes /4; four_bytes > 0; four_bytes--) {
  74                 *dest32 = readl( src32);
  75                 dest32++;
  76                 src32++;
  77         }
  78
  79         return;
  80 }
  81
  82 #else
  83
  84 static inline void
  85 lpfc_memcpy_to_slim( void __iomem *dest, void *src, unsigned int bytes)
  86 {
  87         /* convert bytes in argument list to word count for copy function */
  88         __iowrite32_copy(dest, src, bytes / sizeof(uint32_t));
  89 }
  90
  91 static inline void
  92 lpfc_memcpy_from_slim( void *dest, void __iomem *src, unsigned int bytes)
  93 {
  94         /* actually returns 1 byte past dest */
  95         memcpy_fromio( dest, src, bytes);
  96 }
  97
  98 #endif  /* __BIG_ENDIAN */