1/*
2 *  include/asm-s390/io.h
3 *
4 *  S390 version
5 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 *  Derived from "include/asm-i386/io.h"
9 */
10
11#ifndef _S390_IO_H
12#define _S390_IO_H
13
14#ifdef __KERNEL__
15
16#include <linux/vmalloc.h>
17#include <asm/page.h>
18
19#define IO_SPACE_LIMIT 0xffffffff
20
21#define __io_virt(x)            ((void *)(PAGE_OFFSET | (unsigned long)(x)))
22#define __io_phys(x)            ((unsigned long)(x) & ~PAGE_OFFSET)
23/*
24 * Change virtual addresses to physical addresses and vv.
25 * These are pretty trivial
26 */
27extern inline unsigned long virt_to_phys(volatile void * address)
28{
29	unsigned long real_address;
30	__asm__ ("   lrag   %0,0(%1)\n"
31                 "   jz     0f\n"
32                 "   slgr   %0,%0\n"
33                 "0:"
34                 : "=a" (real_address) : "a" (address) : "cc" );
35        return real_address;
36}
37
38extern inline void * phys_to_virt(unsigned long address)
39{
40        return __io_virt(address);
41}
42
43extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
44
45extern inline void * ioremap (unsigned long offset, unsigned long size)
46{
47        return __ioremap(offset, size, 0);
48}
49
50/*
51 * This one maps high address device memory and turns off caching for that area.
52 * it's useful if some control registers are in such an area and write combining
53 * or read caching is not desirable:
54 */
55extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
56{
57        return __ioremap(offset, size, 0);
58}
59
60extern void iounmap(void *addr);
61
62/*
63 * IO bus memory addresses are also 1:1 with the physical address
64 */
65#define virt_to_bus virt_to_phys
66#define bus_to_virt phys_to_virt
67
68/*
69 * readX/writeX() are used to access memory mapped devices. On some
70 * architectures the memory mapped IO stuff needs to be accessed
71 * differently.
72 */
73
74#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
75#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
76#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
77
78#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
79#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
80#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
81
82#define memset_io(a,b,c)        memset(__io_virt(a),(b),(c))
83#define memcpy_fromio(a,b,c)    memcpy((a),__io_virt(b),(c))
84#define memcpy_toio(a,b,c)      memcpy(__io_virt(a),(b),(c))
85
86#define inb_p(addr) readb(addr)
87#define inb(addr) readb(addr)
88
89#define outb(x,addr) ((void) writeb(x,addr))
90#define outb_p(x,addr) outb(x,addr)
91
92#endif /* __KERNEL__ */
93
94#endif
95