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18#ifndef _LINUX_IO_MAPPING_H
19#define _LINUX_IO_MAPPING_H
20
21#include <linux/types.h>
22#include <linux/slab.h>
23#include <linux/bug.h>
24#include <asm/io.h>
25#include <asm/page.h>
26
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30
31
32
33
34#ifdef CONFIG_HAVE_ATOMIC_IOMAP
35
36#include <asm/iomap.h>
37
38struct io_mapping {
39 resource_size_t base;
40 unsigned long size;
41 pgprot_t prot;
42};
43
44
45
46
47
48
49
50
51static inline struct io_mapping *
52io_mapping_create_wc(resource_size_t base, unsigned long size)
53{
54 struct io_mapping *iomap;
55 pgprot_t prot;
56
57 iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
58 if (!iomap)
59 goto out_err;
60
61 if (iomap_create_wc(base, size, &prot))
62 goto out_free;
63
64 iomap->base = base;
65 iomap->size = size;
66 iomap->prot = prot;
67 return iomap;
68
69out_free:
70 kfree(iomap);
71out_err:
72 return NULL;
73}
74
75static inline void
76io_mapping_free(struct io_mapping *mapping)
77{
78 iomap_free(mapping->base, mapping->size);
79 kfree(mapping);
80}
81
82
83static inline void __iomem *
84io_mapping_map_atomic_wc(struct io_mapping *mapping,
85 unsigned long offset)
86{
87 resource_size_t phys_addr;
88 unsigned long pfn;
89
90 BUG_ON(offset >= mapping->size);
91 phys_addr = mapping->base + offset;
92 pfn = (unsigned long) (phys_addr >> PAGE_SHIFT);
93 return iomap_atomic_prot_pfn(pfn, mapping->prot);
94}
95
96static inline void
97io_mapping_unmap_atomic(void __iomem *vaddr)
98{
99 iounmap_atomic(vaddr);
100}
101
102static inline void __iomem *
103io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
104{
105 resource_size_t phys_addr;
106
107 BUG_ON(offset >= mapping->size);
108 phys_addr = mapping->base + offset;
109
110 return ioremap_wc(phys_addr, PAGE_SIZE);
111}
112
113static inline void
114io_mapping_unmap(void __iomem *vaddr)
115{
116 iounmap(vaddr);
117}
118
119#else
120
121#include <linux/uaccess.h>
122
123
124struct io_mapping;
125
126
127static inline struct io_mapping *
128io_mapping_create_wc(resource_size_t base, unsigned long size)
129{
130 return (struct io_mapping __force *) ioremap_wc(base, size);
131}
132
133static inline void
134io_mapping_free(struct io_mapping *mapping)
135{
136 iounmap((void __force __iomem *) mapping);
137}
138
139
140static inline void __iomem *
141io_mapping_map_atomic_wc(struct io_mapping *mapping,
142 unsigned long offset)
143{
144 pagefault_disable();
145 return ((char __force __iomem *) mapping) + offset;
146}
147
148static inline void
149io_mapping_unmap_atomic(void __iomem *vaddr)
150{
151 pagefault_enable();
152}
153
154
155static inline void __iomem *
156io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
157{
158 return ((char __force __iomem *) mapping) + offset;
159}
160
161static inline void
162io_mapping_unmap(void __iomem *vaddr)
163{
164}
165
166#endif
167
168#endif
169