include/pcmcia/mem_op.h

   1 /*
   2  * mem_op.h 1.13 2000/06/12 21:55:40
   3  *
   4  * The contents of this file are subject to the Mozilla Public License
   5  * Version 1.1 (the "License"); you may not use this file except in
   6  * compliance with the License. You may obtain a copy of the License
   7  * at http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS"
  10  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
  11  * the License for the specific language governing rights and
  12  * limitations under the License.
  13  *
  14  * The initial developer of the original code is David A. Hinds
  15  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  16  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  17  *
  18  * Alternatively, the contents of this file may be used under the
  19  * terms of the GNU General Public License version 2 (the "GPL"), in which
  20  * case the provisions of the GPL are applicable instead of the
  21  * above.  If you wish to allow the use of your version of this file
  22  * only under the terms of the GPL and not to allow others to use
  23  * your version of this file under the MPL, indicate your decision by
  24  * deleting the provisions above and replace them with the notice and
  25  * other provisions required by the GPL.  If you do not delete the
  26  * provisions above, a recipient may use your version of this file
  27  * under either the MPL or the GPL.
  28  */
  29
  30 #ifndef _LINUX_MEM_OP_H
  31 #define _LINUX_MEM_OP_H
  32
  33 #include <asm/uaccess.h>
  34 #include <asm/io.h>
  35
  36 /*
  37    If UNSAFE_MEMCPY is defined, we use the (optimized) system routines
  38    to copy between a card and kernel memory.  These routines do 32-bit
  39    operations which may not work with all PCMCIA controllers.  The
  40    safe versions defined here will do only 8-bit and 16-bit accesses.
  41 */
  42
  43 #ifdef UNSAFE_MEMCPY
  44
  45 #define copy_from_pc memcpy_fromio
  46 #define copy_to_pc memcpy_toio
  47
  48 static inline void copy_pc_to_user(void *to, const void *from, size_t n)
  49 {
  50     size_t odd = (n & 3);
  51     n -= odd;
  52     while (n) {
  53         put_user(__raw_readl(from), (int *)to);
  54         (char *)from += 4; (char *)to += 4; n -= 4;
  55     }
  56     while (odd--)
  57         put_user(readb((char *)from++), (char *)to++);
  58 }
  59
  60 static inline void copy_user_to_pc(void *to, const void *from, size_t n)
  61 {
  62     int l;
  63     char c;
  64     size_t odd = (n & 3);
  65     n -= odd;
  66     while (n) {
  67         get_user(l, (int *)from);
  68         __raw_writel(l, to);
  69         (char *)to += 4; (char *)from += 4; n -= 4;
  70     }
  71     while (odd--) {
  72         get_user(c, (char *)from++);
  73         writeb(c, (char *)to++);
  74     }
  75 }
  76
  77 #else /* UNSAFE_MEMCPY */
  78
  79 static inline void copy_from_pc(void *to, const void *from, size_t n)
  80 {
  81     size_t odd = (n & 1);
  82     n -= odd;
  83     while (n) {
  84         u_short *t = to;
  85
  86         *t = __raw_readw(from);
  87         to = (void *)((long)to + 2);
  88         from = (const void *)((long)from + 2);
  89         n -= 2;
  90     }
  91     if (odd)
  92         *(u_char *)to = readb(from);
  93 }
  94
  95 static inline void copy_to_pc(void *to, const void *from, size_t n)
  96 {
  97     size_t odd = (n & 1);
  98     n -= odd;
  99     while (n) {
 100         __raw_writew(*(u_short *)from, to);
 101         to = (void *)((long)to + 2);
 102         from = (const void *)((long)from + 2);
 103         n -= 2;
 104     }
 105     if (odd)
 106         writeb(*(u_char *)from, to);
 107 }
 108
 109 static inline void copy_pc_to_user(void *to, const void *from, size_t n)
 110 {
 111     size_t odd = (n & 1);
 112     n -= odd;
 113     while (n) {
 114         put_user(__raw_readw(from), (short *)to);
 115         to = (void *)((long)to + 2);
 116         from = (const void *)((long)from + 2);
 117         n -= 2;
 118     }
 119     if (odd)
 120         put_user(readb(from), (char *)to);
 121 }
 122
 123 static inline void copy_user_to_pc(void *to, const void *from, size_t n)
 124 {
 125     short s;
 126     char c;
 127     size_t odd = (n & 1);
 128     n -= odd;
 129     while (n) {
 130         get_user(s, (short *)from);
 131         __raw_writew(s, to);
 132         to = (void *)((long)to + 2);
 133         from = (const void *)((long)from + 2);
 134         n -= 2;
 135     }
 136     if (odd) {
 137         get_user(c, (char *)from);
 138         writeb(c, to);
 139     }
 140 }
 141
 142 #endif /* UNSAFE_MEMCPY */
 143
 144 #endif /* _LINUX_MEM_OP_H */