blob: 8188fdc9884f94d04a088785d3ca21c0b1c8ab49 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
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__ (
31#ifndef __s390x__
32 " lra %0,0(%1)\n"
33 " jz 0f\n"
34 " sr %0,%0\n"
35#else /* __s390x__ */
36 " lrag %0,0(%1)\n"
37 " jz 0f\n"
38 " slgr %0,%0\n"
39#endif /* __s390x__ */
40 "0:"
41 : "=a" (real_address) : "a" (address) : "cc" );
42 return real_address;
43}
44
45extern inline void * phys_to_virt(unsigned long address)
46{
47 return __io_virt(address);
48}
49
50/*
51 * Change "struct page" to physical address.
52 */
53#define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
54
55extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
56
57extern inline void * ioremap (unsigned long offset, unsigned long size)
58{
59 return __ioremap(offset, size, 0);
60}
61
62/*
63 * This one maps high address device memory and turns off caching for that area.
64 * it's useful if some control registers are in such an area and write combining
65 * or read caching is not desirable:
66 */
67extern inline void * ioremap_nocache (unsigned long offset, unsigned long size)
68{
69 return __ioremap(offset, size, 0);
70}
71
72extern void iounmap(void *addr);
73
74/*
75 * IO bus memory addresses are also 1:1 with the physical address
76 */
77#define virt_to_bus virt_to_phys
78#define bus_to_virt phys_to_virt
79
80/*
81 * readX/writeX() are used to access memory mapped devices. On some
82 * architectures the memory mapped IO stuff needs to be accessed
83 * differently.
84 */
85
86#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
87#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
88#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
89
90#define readb_relaxed(addr) readb(addr)
91#define readw_relaxed(addr) readw(addr)
92#define readl_relaxed(addr) readl(addr)
93
94#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
95#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
96#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
97
98#define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
99#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
100#define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
101
102#define inb_p(addr) readb(addr)
103#define inb(addr) readb(addr)
104
105#define outb(x,addr) ((void) writeb(x,addr))
106#define outb_p(x,addr) outb(x,addr)
107
108#define mmiowb()
109
110/*
111 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
112 * access
113 */
114#define xlate_dev_mem_ptr(p) __va(p)
115
116/*
117 * Convert a virtual cached pointer to an uncached pointer
118 */
119#define xlate_dev_kmem_ptr(p) p
120
121#endif /* __KERNEL__ */
122
123#endif