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 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 int ioremap_page_range(unsigned long addr, unsigned long end,
  31                        unsigned long phys_addr, pgprot_t prot);
  32
  33 /*
  34  * Managed iomap interface
  35  */
  36 #ifdef CONFIG_HAS_IOPORT
  37 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  38                                unsigned int nr);
  39 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  40 #else
  41 static inline void __iomem *devm_ioport_map(struct device *dev,
  42                                              unsigned long port,
  43                                              unsigned int nr)
  44 {
  45         return NULL;
  46 }
  47
  48 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
  49 {
  50 }
  51 #endif
  52
  53 void __iomem * devm_ioremap(struct device *dev, unsigned long offset,
  54                             unsigned long size);
  55 void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset,
  56                                     unsigned long size);
  57 void devm_iounmap(struct device *dev, void __iomem *addr);
  58
  59 /**
  60  *      check_signature         -       find BIOS signatures
  61  *      @io_addr: mmio address to check
  62  *      @signature:  signature block
  63  *      @length: length of signature
  64  *
  65  *      Perform a signature comparison with the mmio address io_addr. This
  66  *      address should have been obtained by ioremap.
  67  *      Returns 1 on a match.
  68  */
  69
  70 static inline int check_signature(const volatile void __iomem *io_addr,
  71         const unsigned char *signature, int length)
  72 {
  73         int retval = 0;
  74         do {
  75                 if (readb(io_addr) != *signature)
  76                         goto out;
  77                 io_addr++;
  78                 signature++;
  79                 length--;
  80         } while (length);
  81         retval = 1;
  82 out:
  83         return retval;
  84 }
  85
  86 #endif /* _LINUX_IO_H */