forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
io.h
123 lines (98 loc) · 3.19 KB
/
io.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
/*
* include/asm-s390/io.h
*
* S390 version
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky ([email protected])
*
* Derived from "include/asm-i386/io.h"
*/
#ifndef _S390_IO_H
#define _S390_IO_H
#ifdef __KERNEL__
#include <linux/vmalloc.h>
#include <asm/page.h>
#define IO_SPACE_LIMIT 0xffffffff
#define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x)))
/*
* Change virtual addresses to physical addresses and vv.
* These are pretty trivial
*/
static inline unsigned long virt_to_phys(volatile void * address)
{
unsigned long real_address;
__asm__ (
#ifndef __s390x__
" lra %0,0(%1)\n"
" jz 0f\n"
" sr %0,%0\n"
#else /* __s390x__ */
" lrag %0,0(%1)\n"
" jz 0f\n"
" slgr %0,%0\n"
#endif /* __s390x__ */
"0:"
: "=a" (real_address) : "a" (address) : "cc" );
return real_address;
}
static inline void * phys_to_virt(unsigned long address)
{
return __io_virt(address);
}
/*
* Change "struct page" to physical address.
*/
#define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
static inline void * ioremap (unsigned long offset, unsigned long size)
{
return __ioremap(offset, size, 0);
}
/*
* This one maps high address device memory and turns off caching for that area.
* it's useful if some control registers are in such an area and write combining
* or read caching is not desirable:
*/
static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
{
return __ioremap(offset, size, 0);
}
extern void iounmap(void *addr);
/*
* IO bus memory addresses are also 1:1 with the physical address
*/
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
/*
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently.
*/
#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
#define readb_relaxed(addr) readb(addr)
#define readw_relaxed(addr) readw(addr)
#define readl_relaxed(addr) readl(addr)
#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
#define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
#define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
#define inb_p(addr) readb(addr)
#define inb(addr) readb(addr)
#define outb(x,addr) ((void) writeb(x,addr))
#define outb_p(x,addr) outb(x,addr)
#define mmiowb()
/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
*/
#define xlate_dev_mem_ptr(p) __va(p)
/*
* Convert a virtual cached pointer to an uncached pointer
*/
#define xlate_dev_kmem_ptr(p) p
#endif /* __KERNEL__ */
#endif