Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0-only */
2 : /*
3 : * Copyright 2006 PathScale, Inc. All Rights Reserved.
4 : */
5 :
6 : #ifndef _LINUX_IO_H
7 : #define _LINUX_IO_H
8 :
9 : #include <linux/types.h>
10 : #include <linux/init.h>
11 : #include <linux/bug.h>
12 : #include <linux/err.h>
13 : #include <asm/io.h>
14 : #include <asm/page.h>
15 :
16 : struct device;
17 : struct resource;
18 :
19 : __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
20 : void __ioread32_copy(void *to, const void __iomem *from, size_t count);
21 : void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
22 :
23 : #ifdef CONFIG_MMU
24 : int ioremap_page_range(unsigned long addr, unsigned long end,
25 : phys_addr_t phys_addr, pgprot_t prot);
26 : #else
27 : static inline int ioremap_page_range(unsigned long addr, unsigned long end,
28 : phys_addr_t phys_addr, pgprot_t prot)
29 : {
30 : return 0;
31 : }
32 : #endif
33 :
34 : /*
35 : * Managed iomap interface
36 : */
37 : #ifdef CONFIG_HAS_IOPORT_MAP
38 : void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
39 : unsigned int nr);
40 : void devm_ioport_unmap(struct device *dev, void __iomem *addr);
41 : #else
42 : static inline void __iomem *devm_ioport_map(struct device *dev,
43 : unsigned long port,
44 : unsigned int nr)
45 : {
46 : return NULL;
47 : }
48 :
49 : static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
50 : {
51 : }
52 : #endif
53 :
54 : #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
55 :
56 : void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
57 : resource_size_t size);
58 : void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset,
59 : resource_size_t size);
60 : void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
61 : resource_size_t size);
62 : void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset,
63 : resource_size_t size);
64 : void devm_iounmap(struct device *dev, void __iomem *addr);
65 : int check_signature(const volatile void __iomem *io_addr,
66 : const unsigned char *signature, int length);
67 : void devm_ioremap_release(struct device *dev, void *res);
68 :
69 : void *devm_memremap(struct device *dev, resource_size_t offset,
70 : size_t size, unsigned long flags);
71 : void devm_memunmap(struct device *dev, void *addr);
72 :
73 : #ifdef CONFIG_PCI
74 : /*
75 : * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
76 : * Posting") mandate non-posted configuration transactions. This default
77 : * implementation attempts to use the ioremap_np() API to provide this
78 : * on arches that support it, and falls back to ioremap() on those that
79 : * don't. Overriding this function is deprecated; arches that properly
80 : * support non-posted accesses should implement ioremap_np() instead, which
81 : * this default implementation can then use to return mappings compliant with
82 : * the PCI specification.
83 : */
84 : #ifndef pci_remap_cfgspace
85 : #define pci_remap_cfgspace pci_remap_cfgspace
86 : static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
87 : size_t size)
88 : {
89 0 : return ioremap_np(offset, size) ?: ioremap(offset, size);
90 : }
91 : #endif
92 : #endif
93 :
94 : /*
95 : * Some systems do not have legacy ISA devices.
96 : * /dev/port is not a valid interface on these systems.
97 : * So for those archs, <asm/io.h> should define the following symbol.
98 : */
99 : #ifndef arch_has_dev_port
100 : #define arch_has_dev_port() (1)
101 : #endif
102 :
103 : /*
104 : * Some systems (x86 without PAT) have a somewhat reliable way to mark a
105 : * physical address range such that uncached mappings will actually
106 : * end up write-combining. This facility should be used in conjunction
107 : * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
108 : * no effect if the per-page mechanisms are functional.
109 : * (On x86 without PAT, these functions manipulate MTRRs.)
110 : *
111 : * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
112 : * to have no effect.
113 : */
114 : #ifndef arch_phys_wc_add
115 : static inline int __must_check arch_phys_wc_add(unsigned long base,
116 : unsigned long size)
117 : {
118 : return 0; /* It worked (i.e. did nothing). */
119 : }
120 :
121 : static inline void arch_phys_wc_del(int handle)
122 : {
123 : }
124 :
125 : #define arch_phys_wc_add arch_phys_wc_add
126 : #ifndef arch_phys_wc_index
127 : static inline int arch_phys_wc_index(int handle)
128 : {
129 : return -1;
130 : }
131 : #define arch_phys_wc_index arch_phys_wc_index
132 : #endif
133 : #endif
134 :
135 : int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size);
136 :
137 : enum {
138 : /* See memremap() kernel-doc for usage description... */
139 : MEMREMAP_WB = 1 << 0,
140 : MEMREMAP_WT = 1 << 1,
141 : MEMREMAP_WC = 1 << 2,
142 : MEMREMAP_ENC = 1 << 3,
143 : MEMREMAP_DEC = 1 << 4,
144 : };
145 :
146 : void *memremap(resource_size_t offset, size_t size, unsigned long flags);
147 : void memunmap(void *addr);
148 :
149 : /*
150 : * On x86 PAT systems we have memory tracking that keeps track of
151 : * the allowed mappings on memory ranges. This tracking works for
152 : * all the in-kernel mapping APIs (ioremap*), but where the user
153 : * wishes to map a range from a physical device into user memory
154 : * the tracking won't be updated. This API is to be used by
155 : * drivers which remap physical device pages into userspace,
156 : * and wants to make sure they are mapped WC and not UC.
157 : */
158 : #ifndef arch_io_reserve_memtype_wc
159 : static inline int arch_io_reserve_memtype_wc(resource_size_t base,
160 : resource_size_t size)
161 : {
162 : return 0;
163 : }
164 :
165 : static inline void arch_io_free_memtype_wc(resource_size_t base,
166 : resource_size_t size)
167 : {
168 : }
169 : #endif
170 :
171 : int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
172 : resource_size_t size);
173 :
174 : #endif /* _LINUX_IO_H */
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