r6040: make printks consistent with DRV_NAME
[linux-2.6/linux-2.6-openrd.git] / include / linux / io-mapping.h
blob82df31726a546de40a1d010c588f56f7c1d3955c
1 /*
2 * Copyright © 2008 Keith Packard <keithp@keithp.com>
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.
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.
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.
18 #ifndef _LINUX_IO_MAPPING_H
19 #define _LINUX_IO_MAPPING_H
21 #include <linux/types.h>
22 #include <asm/io.h>
23 #include <asm/page.h>
24 #include <asm/iomap.h>
27 * The io_mapping mechanism provides an abstraction for mapping
28 * individual pages from an io device to the CPU in an efficient fashion.
30 * See Documentation/io_mapping.txt
33 /* this struct isn't actually defined anywhere */
34 struct io_mapping;
36 #ifdef CONFIG_HAVE_ATOMIC_IOMAP
39 * For small address space machines, mapping large objects
40 * into the kernel virtual space isn't practical. Where
41 * available, use fixmap support to dynamically map pages
42 * of the object at run time.
45 static inline struct io_mapping *
46 io_mapping_create_wc(unsigned long base, unsigned long size)
48 return (struct io_mapping *) base;
51 static inline void
52 io_mapping_free(struct io_mapping *mapping)
56 /* Atomic map/unmap */
57 static inline void *
58 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
60 offset += (unsigned long) mapping;
61 return iomap_atomic_prot_pfn(offset >> PAGE_SHIFT, KM_USER0,
62 __pgprot(__PAGE_KERNEL_WC));
65 static inline void
66 io_mapping_unmap_atomic(void *vaddr)
68 iounmap_atomic(vaddr, KM_USER0);
71 static inline void *
72 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
74 offset += (unsigned long) mapping;
75 return ioremap_wc(offset, PAGE_SIZE);
78 static inline void
79 io_mapping_unmap(void *vaddr)
81 iounmap(vaddr);
84 #else
86 /* Create the io_mapping object*/
87 static inline struct io_mapping *
88 io_mapping_create_wc(unsigned long base, unsigned long size)
90 return (struct io_mapping *) ioremap_wc(base, size);
93 static inline void
94 io_mapping_free(struct io_mapping *mapping)
96 iounmap(mapping);
99 /* Atomic map/unmap */
100 static inline void *
101 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
103 return ((char *) mapping) + offset;
106 static inline void
107 io_mapping_unmap_atomic(void *vaddr)
111 /* Non-atomic map/unmap */
112 static inline void *
113 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
115 return ((char *) mapping) + offset;
118 static inline void
119 io_mapping_unmap(void *vaddr)
123 #endif /* HAVE_ATOMIC_IOMAP */
125 #endif /* _LINUX_IO_MAPPING_H */