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  */
  11 void 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 }
  20 EXPORT_SYMBOL(memcpy_fromio);
  21
  22 /*
  23  * Copy data from "real" memory space to IO memory space.
  24  * This needs to be optimized.
  25  */
  26 void 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 }
  35 EXPORT_SYMBOL(memcpy_toio);
  36
  37 /*
  38  * "memset" on IO memory space.
  39  * This needs to be optimized.
  40  */
  41 void 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 }
  51 EXPORT_SYMBOL(memset_io);