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 devm_iounmap(struct device *dev, void __iomem *addr);
63 : int check_signature(const volatile void __iomem *io_addr,
64 : const unsigned char *signature, int length);
65 : void devm_ioremap_release(struct device *dev, void *res);
66 :
67 : void *devm_memremap(struct device *dev, resource_size_t offset,
68 : size_t size, unsigned long flags);
69 : void devm_memunmap(struct device *dev, void *addr);
70 :
71 : #ifdef CONFIG_PCI
72 : /*
73 : * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
74 : * Posting") mandate non-posted configuration transactions. This default
75 : * implementation attempts to use the ioremap_np() API to provide this
76 : * on arches that support it, and falls back to ioremap() on those that
77 : * don't. Overriding this function is deprecated; arches that properly
78 : * support non-posted accesses should implement ioremap_np() instead, which
79 : * this default implementation can then use to return mappings compliant with
80 : * the PCI specification.
81 : */
82 : #ifndef pci_remap_cfgspace
83 : #define pci_remap_cfgspace pci_remap_cfgspace
84 : static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
85 : size_t size)
86 : {
87 0 : return ioremap_np(offset, size) ?: ioremap(offset, size);
88 : }
89 : #endif
90 : #endif
91 :
92 : /*
93 : * Some systems do not have legacy ISA devices.
94 : * /dev/port is not a valid interface on these systems.
95 : * So for those archs, <asm/io.h> should define the following symbol.
96 : */
97 : #ifndef arch_has_dev_port
98 : #define arch_has_dev_port() (1)
99 : #endif
100 :
101 : /*
102 : * Some systems (x86 without PAT) have a somewhat reliable way to mark a
103 : * physical address range such that uncached mappings will actually
104 : * end up write-combining. This facility should be used in conjunction
105 : * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
106 : * no effect if the per-page mechanisms are functional.
107 : * (On x86 without PAT, these functions manipulate MTRRs.)
108 : *
109 : * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
110 : * to have no effect.
111 : */
112 : #ifndef arch_phys_wc_add
113 : static inline int __must_check arch_phys_wc_add(unsigned long base,
114 : unsigned long size)
115 : {
116 : return 0; /* It worked (i.e. did nothing). */
117 : }
118 :
119 : static inline void arch_phys_wc_del(int handle)
120 : {
121 : }
122 :
123 : #define arch_phys_wc_add arch_phys_wc_add
124 : #ifndef arch_phys_wc_index
125 : static inline int arch_phys_wc_index(int handle)
126 : {
127 : return -1;
128 : }
129 : #define arch_phys_wc_index arch_phys_wc_index
130 : #endif
131 : #endif
132 :
133 : int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size);
134 :
135 : enum {
136 : /* See memremap() kernel-doc for usage description... */
137 : MEMREMAP_WB = 1 << 0,
138 : MEMREMAP_WT = 1 << 1,
139 : MEMREMAP_WC = 1 << 2,
140 : MEMREMAP_ENC = 1 << 3,
141 : MEMREMAP_DEC = 1 << 4,
142 : };
143 :
144 : void *memremap(resource_size_t offset, size_t size, unsigned long flags);
145 : void memunmap(void *addr);
146 :
147 : /*
148 : * On x86 PAT systems we have memory tracking that keeps track of
149 : * the allowed mappings on memory ranges. This tracking works for
150 : * all the in-kernel mapping APIs (ioremap*), but where the user
151 : * wishes to map a range from a physical device into user memory
152 : * the tracking won't be updated. This API is to be used by
153 : * drivers which remap physical device pages into userspace,
154 : * and wants to make sure they are mapped WC and not UC.
155 : */
156 : #ifndef arch_io_reserve_memtype_wc
157 : static inline int arch_io_reserve_memtype_wc(resource_size_t base,
158 : resource_size_t size)
159 : {
160 : return 0;
161 : }
162 :
163 : static inline void arch_io_free_memtype_wc(resource_size_t base,
164 : resource_size_t size)
165 : {
166 : }
167 : #endif
168 :
169 : int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
170 : resource_size_t size);
171 :
172 : #endif /* _LINUX_IO_H */
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