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 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  37                                unsigned int nr);
  38 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  39
  40 void __iomem * devm_ioremap(struct device *dev, unsigned long offset,
  41                             unsigned long size);
  42 void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset,
  43                                     unsigned long size);
  44 void devm_iounmap(struct device *dev, void __iomem *addr);
  45
  46 /**
  47  *      check_signature         -       find BIOS signatures
  48  *      @io_addr: mmio address to check
  49  *      @signature:  signature block
  50  *      @length: length of signature
  51  *
  52  *      Perform a signature comparison with the mmio address io_addr. This
  53  *      address should have been obtained by ioremap.
  54  *      Returns 1 on a match.
  55  */
  56
  57 static inline int check_signature(const volatile void __iomem *io_addr,
  58         const unsigned char *signature, int length)
  59 {
  60         int retval = 0;
  61         do {
  62                 if (readb(io_addr) != *signature)
  63                         goto out;
  64                 io_addr++;
  65                 signature++;
  66                 length--;
  67         } while (length);
  68         retval = 1;
  69 out:
  70         return retval;
  71 }
  72
  73 #endif /* _LINUX_IO_H */