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