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 void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
  26 void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
  27
  28 int ioremap_page_range(unsigned long addr, unsigned long end,
  29                        unsigned long phys_addr, pgprot_t prot);
  30
  31 /**
  32  *      check_signature         -       find BIOS signatures
  33  *      @io_addr: mmio address to check
  34  *      @signature:  signature block
  35  *      @length: length of signature
  36  *
  37  *      Perform a signature comparison with the mmio address io_addr. This
  38  *      address should have been obtained by ioremap.
  39  *      Returns 1 on a match.
  40  */
  41
  42 static inline int check_signature(const volatile void __iomem *io_addr,
  43         const unsigned char *signature, int length)
  44 {
  45         int retval = 0;
  46         do {
  47                 if (readb(io_addr) != *signature)
  48                         goto out;
  49                 io_addr++;
  50                 signature++;
  51                 length--;
  52         } while (length);
  53         retval = 1;
  54 out:
  55         return retval;
  56 }
  57
  58 #endif /* _LINUX_IO_H */