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