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