arch/sh/kernel/io.c

   1 /*
   2  * linux/arch/sh/kernel/io.c
   3  *
   4  * Copyright (C) 2000  Stuart Menefy
   5  * Copyright (C) 2005  Paul Mundt
   6  *
   7  * Provide real functions which expand to whatever the header file defined.
   8  * Also definitions of machine independent IO functions.
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14 #include <linux/module.h>
  15 #include <asm/machvec.h>
  16 #include <asm/io.h>
  17
  18 /*
  19  * Copy data from IO memory space to "real" memory space.
  20  * This needs to be optimized.
  21  */
  22 void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
  23 {
  24         unsigned char *p = to;
  25         while (count) {
  26                 count--;
  27                 *p = readb(from);
  28                 p++;
  29                 from++;
  30         }
  31 }
  32 EXPORT_SYMBOL(memcpy_fromio);
  33
  34 /*
  35  * Copy data from "real" memory space to IO memory space.
  36  * This needs to be optimized.
  37  */
  38 void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
  39 {
  40         const unsigned char *p = from;
  41         while (count) {
  42                 count--;
  43                 writeb(*p, to);
  44                 p++;
  45                 to++;
  46         }
  47 }
  48 EXPORT_SYMBOL(memcpy_toio);
  49
  50 /*
  51  * "memset" on IO memory space.
  52  * This needs to be optimized.
  53  */
  54 void memset_io(volatile void __iomem *dst, int c, unsigned long count)
  55 {
  56         while (count) {
  57                 count--;
  58                 writeb(c, dst);
  59                 dst++;
  60         }
  61 }
  62 EXPORT_SYMBOL(memset_io);
  63
  64 void __iomem *ioport_map(unsigned long port, unsigned int nr)
  65 {
  66         void __iomem *ret;
  67
  68         ret = __ioport_map_trapped(port, nr);
  69         if (ret)
  70                 return ret;
  71
  72         return __ioport_map(port, nr);
  73 }
  74 EXPORT_SYMBOL(ioport_map);
  75
  76 void ioport_unmap(void __iomem *addr)
  77 {
  78         sh_mv.mv_ioport_unmap(addr);
  79 }
  80 EXPORT_SYMBOL(ioport_unmap);