git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |