Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
16 | #include <asm/page.h> |
17 | ||
18 | #define IO_SPACE_LIMIT 0xffffffff | |
19 | ||
20 | #define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x))) | |
21 | ||
22 | /* | |
23 | * Change virtual addresses to physical addresses and vv. | |
24 | * These are pretty trivial | |
25 | */ | |
4448aaf0 | 26 | static inline unsigned long virt_to_phys(volatile void * address) |
1da177e4 LT |
27 | { |
28 | unsigned long real_address; | |
94c12cc7 | 29 | asm volatile( |
94c12cc7 | 30 | " lra %0,0(%1)\n" |
94c12cc7 MS |
31 | " jz 0f\n" |
32 | " la %0,0\n" | |
1da177e4 | 33 | "0:" |
94c12cc7 | 34 | : "=a" (real_address) : "a" (address) : "cc"); |
1da177e4 LT |
35 | return real_address; |
36 | } | |
37 | ||
4448aaf0 | 38 | static inline void * phys_to_virt(unsigned long address) |
1da177e4 LT |
39 | { |
40 | return __io_virt(address); | |
41 | } | |
42 | ||
39b083fe | 43 | #define mmiowb() do { } while (0) |
1da177e4 LT |
44 | |
45 | /* | |
46 | * Convert a physical pointer to a virtual kernel pointer for /dev/mem | |
47 | * access | |
48 | */ | |
49 | #define xlate_dev_mem_ptr(p) __va(p) | |
50 | ||
51 | /* | |
52 | * Convert a virtual cached pointer to an uncached pointer | |
53 | */ | |
54 | #define xlate_dev_kmem_ptr(p) p | |
55 | ||
56 | #endif /* __KERNEL__ */ | |
57 | ||
58 | #endif |