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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 /*
 94  * Some systems do not have legacy ISA devices.
 95  * /dev/port is not a valid interface on these systems.
 96  * So for those archs, <asm/io.h> should define the following symbol.
 97  */
 98 #ifndef arch_has_dev_port
 99 #define arch_has_dev_port()     (1)
100 #endif
101 
102 /*
103  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
104  * physical address range such that uncached mappings will actually
105  * end up write-combining.  This facility should be used in conjunction
106  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
107  * no effect if the per-page mechanisms are functional.
108  * (On x86 without PAT, these functions manipulate MTRRs.)
109  *
110  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
111  * to have no effect.
112  */
113 #ifndef arch_phys_wc_add
114 static inline int __must_check arch_phys_wc_add(unsigned long base,
115                                                 unsigned long size)
116 {
117         return 0;  /* It worked (i.e. did nothing). */
118 }
119 
120 static inline void arch_phys_wc_del(int handle)
121 {
122 }
123 
124 #define arch_phys_wc_add arch_phys_wc_add
125 #ifndef arch_phys_wc_index
126 static inline int arch_phys_wc_index(int handle)
127 {
128         return -1;
129 }
130 #define arch_phys_wc_index arch_phys_wc_index
131 #endif
132 #endif
133 
134 enum {
135         /* See memremap() kernel-doc for usage description... */
136         MEMREMAP_WB = 1 << 0,
137         MEMREMAP_WT = 1 << 1,
138         MEMREMAP_WC = 1 << 2,
139 };
140 
141 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
142 void memunmap(void *addr);
143 
144 #endif /* _LINUX_IO_H */
145 

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