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TOMOYO Linux Cross Reference
Linux/include/linux/io.h

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  1 /*
  2  * Copyright 2006 PathScale, Inc.  All Rights Reserved.
  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_H
 19 #define _LINUX_IO_H
 20 
 21 #include <linux/types.h>
 22 #include <linux/init.h>
 23 #include <linux/bug.h>
 24 #include <linux/err.h>
 25 #include <asm/io.h>
 26 #include <asm/page.h>
 27 
 28 struct device;
 29 struct resource;
 30 
 31 __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
 32 void __ioread32_copy(void *to, const void __iomem *from, size_t count);
 33 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
 34 
 35 #ifdef CONFIG_MMU
 36 int ioremap_page_range(unsigned long addr, unsigned long end,
 37                        phys_addr_t phys_addr, pgprot_t prot);
 38 #else
 39 static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 40                                      phys_addr_t phys_addr, pgprot_t prot)
 41 {
 42         return 0;
 43 }
 44 #endif
 45 
 46 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
 47 void __init ioremap_huge_init(void);
 48 int arch_ioremap_pud_supported(void);
 49 int arch_ioremap_pmd_supported(void);
 50 #else
 51 static inline void ioremap_huge_init(void) { }
 52 #endif
 53 
 54 /*
 55  * Managed iomap interface
 56  */
 57 #ifdef CONFIG_HAS_IOPORT_MAP
 58 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 59                                unsigned int nr);
 60 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
 61 #else
 62 static inline void __iomem *devm_ioport_map(struct device *dev,
 63                                              unsigned long port,
 64                                              unsigned int nr)
 65 {
 66         return NULL;
 67 }
 68 
 69 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 70 {
 71 }
 72 #endif
 73 
 74 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
 75 
 76 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 77                            resource_size_t size);
 78 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 79                                    resource_size_t size);
 80 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
 81                                    resource_size_t size);
 82 void devm_iounmap(struct device *dev, void __iomem *addr);
 83 int check_signature(const volatile void __iomem *io_addr,
 84                         const unsigned char *signature, int length);
 85 void devm_ioremap_release(struct device *dev, void *res);
 86 
 87 void *devm_memremap(struct device *dev, resource_size_t offset,
 88                 size_t size, unsigned long flags);
 89 void devm_memunmap(struct device *dev, void *addr);
 90 
 91 void *__devm_memremap_pages(struct device *dev, struct resource *res);
 92 
 93 #ifdef CONFIG_PCI
 94 /*
 95  * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and
 96  * Posting") mandate non-posted configuration transactions. There is
 97  * no ioremap API in the kernel that can guarantee non-posted write
 98  * semantics across arches so provide a default implementation for
 99  * mapping PCI config space that defaults to ioremap_nocache(); arches
100  * should override it if they have memory mapping implementations that
101  * guarantee non-posted writes semantics to make the memory mapping
102  * compliant with the PCI specification.
103  */
104 #ifndef pci_remap_cfgspace
105 #define pci_remap_cfgspace pci_remap_cfgspace
106 static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset,
107                                                size_t size)
108 {
109         return ioremap_nocache(offset, size);
110 }
111 #endif
112 #endif
113 
114 /*
115  * Some systems do not have legacy ISA devices.
116  * /dev/port is not a valid interface on these systems.
117  * So for those archs, <asm/io.h> should define the following symbol.
118  */
119 #ifndef arch_has_dev_port
120 #define arch_has_dev_port()     (1)
121 #endif
122 
123 /*
124  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
125  * physical address range such that uncached mappings will actually
126  * end up write-combining.  This facility should be used in conjunction
127  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
128  * no effect if the per-page mechanisms are functional.
129  * (On x86 without PAT, these functions manipulate MTRRs.)
130  *
131  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
132  * to have no effect.
133  */
134 #ifndef arch_phys_wc_add
135 static inline int __must_check arch_phys_wc_add(unsigned long base,
136                                                 unsigned long size)
137 {
138         return 0;  /* It worked (i.e. did nothing). */
139 }
140 
141 static inline void arch_phys_wc_del(int handle)
142 {
143 }
144 
145 #define arch_phys_wc_add arch_phys_wc_add
146 #ifndef arch_phys_wc_index
147 static inline int arch_phys_wc_index(int handle)
148 {
149         return -1;
150 }
151 #define arch_phys_wc_index arch_phys_wc_index
152 #endif
153 #endif
154 
155 enum {
156         /* See memremap() kernel-doc for usage description... */
157         MEMREMAP_WB = 1 << 0,
158         MEMREMAP_WT = 1 << 1,
159         MEMREMAP_WC = 1 << 2,
160 };
161 
162 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
163 void memunmap(void *addr);
164 
165 /*
166  * On x86 PAT systems we have memory tracking that keeps track of
167  * the allowed mappings on memory ranges. This tracking works for
168  * all the in-kernel mapping APIs (ioremap*), but where the user
169  * wishes to map a range from a physical device into user memory
170  * the tracking won't be updated. This API is to be used by
171  * drivers which remap physical device pages into userspace,
172  * and wants to make sure they are mapped WC and not UC.
173  */
174 #ifndef arch_io_reserve_memtype_wc
175 static inline int arch_io_reserve_memtype_wc(resource_size_t base,
176                                              resource_size_t size)
177 {
178         return 0;
179 }
180 
181 static inline void arch_io_free_memtype_wc(resource_size_t base,
182                                            resource_size_t size)
183 {
184 }
185 #endif
186 
187 #endif /* _LINUX_IO_H */
188 

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