LXR linux/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 */
  10void _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 */
  25void _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 */
  40void _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
  49EXPORT_SYMBOL(_memcpy_fromio);
  50EXPORT_SYMBOL(_memcpy_toio);
  51EXPORT_SYMBOL(_memset_io);
  52