projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9663f2e6 KP |
1 | /* |
| 2 | * Copyright © 2008 Keith Packard <keithp@keithp.com> | |
| 3 | * | |
| 4 | * This file is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of version 2 of the GNU General Public License | |
| 6 | * as published by the Free Software Foundation. | |
| 7 | * | |
| 8 | * This program is distributed in the hope that it will be useful, | |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 | * GNU General Public License for more details. | |
| 12 | * | |
| 13 | * You should have received a copy of the GNU General Public License | |
| 14 | * along with this program; if not, write to the Free Software Foundation, | |
| 15 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. | |
| 16 | */ | |
| 17 | ||
| 18 | #ifndef _LINUX_IO_MAPPING_H | |
| 19 | #define _LINUX_IO_MAPPING_H | |
| 20 | ||
| 21 | #include <linux/types.h> | |
| 22 | #include <asm/io.h> | |
| 23 | #include <asm/page.h> | |
| 24 | #include <asm/iomap.h> | |
| 25 | ||
| 26 | /* | |
| 27 | * The io_mapping mechanism provides an abstraction for mapping | |
| 28 | * individual pages from an io device to the CPU in an efficient fashion. | |
| 29 | * | |
| 30 | * See Documentation/io_mapping.txt | |
| 31 | */ | |
| 32 | ||
| 33 | /* this struct isn't actually defined anywhere */ | |
| 34 | struct io_mapping; | |
| 35 | ||
| 36 | #ifdef CONFIG_X86_64 | |
| 37 | ||
| 38 | /* Create the io_mapping object*/ | |
| 39 | static inline struct io_mapping * | |
| 40 | io_mapping_create_wc(unsigned long base, unsigned long size) | |
| 41 | { | |
| 42 | return (struct io_mapping *) ioremap_wc(base, size); | |
| 43 | } | |
| 44 | ||
| 45 | static inline void | |
| 46 | io_mapping_free(struct io_mapping *mapping) | |
| 47 | { | |
| 48 | iounmap(mapping); | |
| 49 | } | |
| 50 | ||
| 51 | /* Atomic map/unmap */ | |
| 52 | static inline void * | |
| 53 | io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) | |
| 54 | { | |
| 55 | return ((char *) mapping) + offset; | |
| 56 | } | |
| 57 | ||
| 58 | static inline void | |
| 59 | io_mapping_unmap_atomic(void *vaddr) | |
| 60 | { | |
| 61 | } | |
| 62 | ||
| 63 | /* Non-atomic map/unmap */ | |
| 64 | static inline void * | |
| 65 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) | |
| 66 | { | |
| 67 | return ((char *) mapping) + offset; | |
| 68 | } | |
| 69 | ||
| 70 | static inline void | |
| 71 | io_mapping_unmap(void *vaddr) | |
| 72 | { | |
| 73 | } | |
| 74 | ||
| 75 | #endif /* CONFIG_X86_64 */ | |
| 76 | ||
| 77 | #ifdef CONFIG_X86_32 | |
| 78 | static inline struct io_mapping * | |
| 79 | io_mapping_create_wc(unsigned long base, unsigned long size) | |
| 80 | { | |
| 81 | return (struct io_mapping *) base; | |
| 82 | } | |
| 83 | ||
| 84 | static inline void | |
| 85 | io_mapping_free(struct io_mapping *mapping) | |
| 86 | { | |
| 87 | } | |
| 88 | ||
| 89 | /* Atomic map/unmap */ | |
| 90 | static inline void * | |
| 91 | io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset) | |
| 92 | { | |
| 93 | offset += (unsigned long) mapping; | |
| 94 | return iomap_atomic_prot_pfn(offset >> PAGE_SHIFT, KM_USER0, | |
| 95 | __pgprot(__PAGE_KERNEL_WC)); | |
| 96 | } | |
| 97 | ||
| 98 | static inline void | |
| 99 | io_mapping_unmap_atomic(void *vaddr) | |
| 100 | { | |
| 101 | iounmap_atomic(vaddr, KM_USER0); | |
| 102 | } | |
| 103 | ||
| 104 | static inline void * | |
| 105 | io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset) | |
| 106 | { | |
| 107 | offset += (unsigned long) mapping; | |
| 108 | return ioremap_wc(offset, PAGE_SIZE); | |
| 109 | } | |
| 110 | ||
| 111 | static inline void | |
| 112 | io_mapping_unmap(void *vaddr) | |
| 113 | { | |
| 114 | iounmap(vaddr); | |
| 115 | } | |
| 116 | #endif /* CONFIG_X86_32 */ | |
| 117 | ||
| 118 | #endif /* _LINUX_IO_MAPPING_H */ |