LXR linux/arch/arm/kernel/io.c

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