LXR linux/arch/ia64/lib/io.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/module.h>
   3#include <linux/types.h>
   4
   5#include <asm/io.h>
   6
   7/*
   8 * Copy data from IO memory space to "real" memory space.
   9 * This needs to be optimized.
  10 */
  11void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
  12{
  13        char *dst = to;
  14
  15        while (count) {
  16                count--;
  17                *dst++ = readb(from++);
  18        }
  19}
  20EXPORT_SYMBOL(memcpy_fromio);
  21
  22/*
  23 * Copy data from "real" memory space to IO memory space.
  24 * This needs to be optimized.
  25 */
  26void memcpy_toio(volatile void __iomem *to, const void *from, long count)
  27{
  28        const char *src = from;
  29
  30        while (count) {
  31                count--;
  32                writeb(*src++, to++);
  33        }
  34}
  35EXPORT_SYMBOL(memcpy_toio);
  36
  37/*
  38 * "memset" on IO memory space.
  39 * This needs to be optimized.
  40 */
  41void memset_io(volatile void __iomem *dst, int c, long count)
  42{
  43        unsigned char ch = (char)(c & 0xff);
  44
  45        while (count) {
  46                count--;
  47                writeb(ch, dst);
  48                dst++;
  49        }
  50}
  51EXPORT_SYMBOL(memset_io);
  52