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#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
  42void __init ioremap_huge_init(void);
  43int arch_ioremap_pud_supported(void);
  44int arch_ioremap_pmd_supported(void);
  45#else
  46static inline void ioremap_huge_init(void) { }
  47#endif
  48
  49/*
  50 * Managed iomap interface
  51 */
  52#ifdef CONFIG_HAS_IOPORT_MAP
  53void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  54                               unsigned int nr);
  55void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  56#else
  57static inline void __iomem *devm_ioport_map(struct device *dev,
  58                                             unsigned long port,
  59                                             unsigned int nr)
  60{
  61        return NULL;
  62}
  63
  64static 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
  71void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
  72                           resource_size_t size);
  73void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
  74                                   resource_size_t size);
  75void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
  76                                   resource_size_t size);
  77void devm_iounmap(struct device *dev, void __iomem *addr);
  78int check_signature(const volatile void __iomem *io_addr,
  79                        const unsigned char *signature, int length);
  80void 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
 103static 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
 109static 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 */
 117