release/src-rt-6.x/linux/linux-2.6/arch/arm/kernel/io.c

   1 #include <linux/module.h>
   2 #include <linux/types.h>
   3
   4 #include <asm/io.h>
   5
   6 /*
   7  * Copy data from IO memory space to "real" memory space.
   8  * This needs to be optimized.
   9  */
  10 void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
  11 {
  12         unsigned char *t = to;
  13         while (count) {
  14                 count--;
  15                 *t = readb(from);
  16                 t++;
  17                 from++;
  18         }
  19 }
  20
  21 /*
  22  * Copy data from "real" memory space to IO memory space.
  23  * This needs to be optimized.
  24  */
  25 void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
  26 {
  27         const unsigned char *f = from;
  28         while (count) {
  29                 count--;
  30                 writeb(*f, to);
  31                 f++;
  32                 to++;
  33         }
  34 }
  35
  36 /*
  37  * "memset" on IO memory space.
  38  * This needs to be optimized.
  39  */
  40 void _memset_io(volatile void __iomem *dst, int c, size_t count)
  41 {
  42         while (count) {
  43                 count--;
  44                 writeb(c, dst);
  45                 dst++;
  46         }
  47 }
  48
  49 EXPORT_SYMBOL(_memcpy_fromio);
  50 EXPORT_SYMBOL(_memcpy_toio);
  51 EXPORT_SYMBOL(_memset_io);