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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 <asm/io.h>
 23 #include <asm/page.h>
 24 
 25 struct device;
 26 
 27 void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
 28 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
 29 
 30 #ifdef CONFIG_MMU
 31 int ioremap_page_range(unsigned long addr, unsigned long end,
 32                        phys_addr_t phys_addr, pgprot_t prot);
 33 #else
 34 static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 35                                      phys_addr_t phys_addr, pgprot_t prot)
 36 {
 37         return 0;
 38 }
 39 #endif
 40 
 41 /*
 42  * Managed iomap interface
 43  */
 44 #ifdef CONFIG_HAS_IOPORT
 45 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
 46                                unsigned int nr);
 47 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
 48 #else
 49 static inline void __iomem *devm_ioport_map(struct device *dev,
 50                                              unsigned long port,
 51                                              unsigned int nr)
 52 {
 53         return NULL;
 54 }
 55 
 56 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
 57 {
 58 }
 59 #endif
 60 
 61 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
 62                             unsigned long size);
 63 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
 64                                     unsigned long size);
 65 void devm_iounmap(struct device *dev, void __iomem *addr);
 66 int check_signature(const volatile void __iomem *io_addr,
 67                         const unsigned char *signature, int length);
 68 void devm_ioremap_release(struct device *dev, void *res);
 69 
 70 /*
 71  * Some systems do not have legacy ISA devices.
 72  * /dev/port is not a valid interface on these systems.
 73  * So for those archs, <asm/io.h> should define the following symbol.
 74  */
 75 #ifndef arch_has_dev_port
 76 #define arch_has_dev_port()     (1)
 77 #endif
 78 
 79 /*
 80  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
 81  * physical address range such that uncached mappings will actually
 82  * end up write-combining.  This facility should be used in conjunction
 83  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
 84  * no effect if the per-page mechanisms are functional.
 85  * (On x86 without PAT, these functions manipulate MTRRs.)
 86  *
 87  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
 88  * to have no effect.
 89  */
 90 #ifndef arch_phys_wc_add
 91 static inline int __must_check arch_phys_wc_add(unsigned long base,
 92                                                 unsigned long size)
 93 {
 94         return 0;  /* It worked (i.e. did nothing). */
 95 }
 96 
 97 static inline void arch_phys_wc_del(int handle)
 98 {
 99 }
100 
101 #define arch_phys_wc_add arch_phys_wc_add
102 #endif
103 
104 #endif /* _LINUX_IO_H */
105 

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