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 <linux/pci.h>
  16 #include <asm/machvec.h>
  17 #include <asm/io.h>
  18
  19 /*
  20  * Copy data from IO memory space to "real" memory space.
  21  * This needs to be optimized.
  22  */
  23 void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
  24 {
  25         unsigned char *p = to;
  26         while (count) {
  27                 count--;
  28                 *p = readb(from);
  29                 p++;
  30                 from++;
  31         }
  32 }
  33 EXPORT_SYMBOL(memcpy_fromio);
  34
  35 /*
  36  * Copy data from "real" memory space to IO memory space.
  37  * This needs to be optimized.
  38  */
  39 void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
  40 {
  41         const unsigned char *p = from;
  42         while (count) {
  43                 count--;
  44                 writeb(*p, to);
  45                 p++;
  46                 to++;
  47         }
  48 }
  49 EXPORT_SYMBOL(memcpy_toio);
  50
  51 /*
  52  * "memset" on IO memory space.
  53  * This needs to be optimized.
  54  */
  55 void memset_io(volatile void __iomem *dst, int c, unsigned long count)
  56 {
  57         while (count) {
  58                 count--;
  59                 writeb(c, dst);
  60                 dst++;
  61         }
  62 }
  63 EXPORT_SYMBOL(memset_io);
  64
  65 void __iomem *ioport_map(unsigned long port, unsigned int nr)
  66 {
  67         void __iomem *ret;
  68
  69         ret = __ioport_map_trapped(port, nr);
  70         if (ret)
  71                 return ret;
  72
  73         return __ioport_map(port, nr);
  74 }
  75 EXPORT_SYMBOL(ioport_map);
  76
  77 void ioport_unmap(void __iomem *addr)
  78 {
  79         sh_mv.mv_ioport_unmap(addr);
  80 }
  81 EXPORT_SYMBOL(ioport_unmap);