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
  25struct device;
  26
  27void __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
  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
  61void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  62                            unsigned long size);
  63void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  64                                    unsigned long size);
  65void devm_iounmap(struct device *dev, void __iomem *addr);
  66int check_signature(const volatile void __iomem *io_addr,
  67                        const unsigned char *signature, int length);
  68void 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#endif /* _LINUX_IO_H */
  80
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