LXR linux/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
  25struct device;
  26
  27__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
  28void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
  29
  30#ifdef CONFIG_MMU
  31int ioremap_page_range(unsigned long addr, unsigned long end,
  32                       phys_addr_t phys_addr, pgprot_t prot);
  33#else
  34static 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
  45void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  46                               unsigned int nr);
  47void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  48#else
  49static inline void __iomem *devm_ioport_map(struct device *dev,
  50                                             unsigned long port,
  51                                             unsigned int nr)
  52{
  53        return NULL;
  54}
  55
  56static 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
  63void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  64                           resource_size_t size);
  65void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  66                                   resource_size_t size);
  67void devm_iounmap(struct device *dev, void __iomem *addr);
  68int check_signature(const volatile void __iomem *io_addr,
  69                        const unsigned char *signature, int length);
  70void 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
  93static 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
  99static 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 */
 107