include/linux/io.h

   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 <asm/io.h>
  24 #include <asm/page.h>
  25
  26 struct device;
  27
  28 __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
  29 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
  30
  31 #ifdef CONFIG_MMU
  32 int ioremap_page_range(unsigned long addr, unsigned long end,
  33                        phys_addr_t phys_addr, pgprot_t prot);
  34 #else
  35 static inline int ioremap_page_range(unsigned long addr, unsigned long end,
  36                                      phys_addr_t phys_addr, pgprot_t prot)
  37 {
  38         return 0;
  39 }
  40 #endif
  41
  42 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
  43 void __init ioremap_huge_init(void);
  44 int arch_ioremap_pud_supported(void);
  45 int arch_ioremap_pmd_supported(void);
  46 #else
  47 static inline void ioremap_huge_init(void) { }
  48 #endif
  49
  50 /*
  51  * Managed iomap interface
  52  */
  53 #ifdef CONFIG_HAS_IOPORT_MAP
  54 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  55                                unsigned int nr);
  56 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  57 #else
  58 static inline void __iomem *devm_ioport_map(struct device *dev,
  59                                              unsigned long port,
  60                                              unsigned int nr)
  61 {
  62         return NULL;
  63 }
  64
  65 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
  66 {
  67 }
  68 #endif
  69
  70 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
  71
  72 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  73                            resource_size_t size);
  74 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  75                                    resource_size_t size);
  76 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
  77                                    resource_size_t size);
  78 void devm_iounmap(struct device *dev, void __iomem *addr);
  79 int check_signature(const volatile void __iomem *io_addr,
  80                         const unsigned char *signature, int length);
  81 void devm_ioremap_release(struct device *dev, void *res);
  82
  83 /*
  84  * Some systems do not have legacy ISA devices.
  85  * /dev/port is not a valid interface on these systems.
  86  * So for those archs, <asm/io.h> should define the following symbol.
  87  */
  88 #ifndef arch_has_dev_port
  89 #define arch_has_dev_port()     (1)
  90 #endif
  91
  92 /*
  93  * Some systems (x86 without PAT) have a somewhat reliable way to mark a
  94  * physical address range such that uncached mappings will actually
  95  * end up write-combining.  This facility should be used in conjunction
  96  * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
  97  * no effect if the per-page mechanisms are functional.
  98  * (On x86 without PAT, these functions manipulate MTRRs.)
  99  *
 100  * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
 101  * to have no effect.
 102  */
 103 #ifndef arch_phys_wc_add
 104 static inline int __must_check arch_phys_wc_add(unsigned long base,
 105                                                 unsigned long size)
 106 {
 107         return 0;  /* It worked (i.e. did nothing). */
 108 }
 109
 110 static inline void arch_phys_wc_del(int handle)
 111 {
 112 }
 113
 114 #define arch_phys_wc_add arch_phys_wc_add
 115 #ifndef arch_phys_wc_index
 116 static inline int arch_phys_wc_index(int handle)
 117 {
 118         return -1;
 119 }
 120 #define arch_phys_wc_index arch_phys_wc_index
 121 #endif
 122 #endif
 123
 124 #endif /* _LINUX_IO_H */