xref: /openbmc/linux/arch/sh/kernel/io.c (revision 22246614)
1 /*
2  * linux/arch/sh/kernel/io.c
3  *
4  * Copyright (C) 2000  Stuart Menefy
5  * Copyright (C) 2005  Paul Mundt
6  *
7  * Provide real functions which expand to whatever the header file defined.
8  * Also definitions of machine independent IO functions.
9  *
10  * This file is subject to the terms and conditions of the GNU General Public
11  * License.  See the file "COPYING" in the main directory of this archive
12  * for more details.
13  */
14 #include <linux/module.h>
15 #include <asm/machvec.h>
16 #include <asm/io.h>
17 
18 /*
19  * Copy data from IO memory space to "real" memory space.
20  * This needs to be optimized.
21  */
22 void memcpy_fromio(void *to, volatile void __iomem *from, unsigned long count)
23 {
24 	char *p = to;
25         while (count) {
26                 count--;
27                 *p = readb((void __iomem *)from);
28                 p++;
29                 from++;
30         }
31 }
32 EXPORT_SYMBOL(memcpy_fromio);
33 
34 /*
35  * Copy data from "real" memory space to IO memory space.
36  * This needs to be optimized.
37  */
38 void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
39 {
40 	const char *p = from;
41         while (count) {
42                 count--;
43                 writeb(*p, (void __iomem *)to);
44                 p++;
45                 to++;
46         }
47 }
48 EXPORT_SYMBOL(memcpy_toio);
49 
50 /*
51  * "memset" on IO memory space.
52  * This needs to be optimized.
53  */
54 void memset_io(volatile void __iomem *dst, int c, unsigned long count)
55 {
56         while (count) {
57                 count--;
58                 writeb(c, (void __iomem *)dst);
59                 dst++;
60         }
61 }
62 EXPORT_SYMBOL(memset_io);
63 
64 void __iomem *ioport_map(unsigned long port, unsigned int nr)
65 {
66 	void __iomem *ret;
67 
68 	ret = __ioport_map_trapped(port, nr);
69 	if (ret)
70 		return ret;
71 
72 	return __ioport_map(port, nr);
73 }
74 EXPORT_SYMBOL(ioport_map);
75 
76 void ioport_unmap(void __iomem *addr)
77 {
78 	sh_mv.mv_ioport_unmap(addr);
79 }
80 EXPORT_SYMBOL(ioport_unmap);
81