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 #ifdef CONFIG_MMU
  31 int ioremap_page_range(unsigned long addr, unsigned long end,
  32                        unsigned long phys_addr, pgprot_t prot);
  33 #else
  34 static inline int ioremap_page_range(unsigned long addr, unsigned long end,
  35                                      unsigned long phys_addr, pgprot_t prot)
  36 {
  37         return 0;
  38 }
  39 #endif
  40
  41 /*
  42  * Managed iomap interface
  43  */
  44 #ifdef CONFIG_HAS_IOPORT
  45 void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
  46                                unsigned int nr);
  47 void devm_ioport_unmap(struct device *dev, void __iomem *addr);
  48 #else
  49 static inline void __iomem *devm_ioport_map(struct device *dev,
  50                                              unsigned long port,
  51                                              unsigned int nr)
  52 {
  53         return NULL;
  54 }
  55
  56 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
  57 {
  58 }
  59 #endif
  60
  61 void __iomem * devm_ioremap(struct device *dev, unsigned long offset,
  62                             unsigned long size);
  63 void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset,
  64                                     unsigned long size);
  65 void devm_iounmap(struct device *dev, void __iomem *addr);
  66
  67 /**
  68  *      check_signature         -       find BIOS signatures
  69  *      @io_addr: mmio address to check
  70  *      @signature:  signature block
  71  *      @length: length of signature
  72  *
  73  *      Perform a signature comparison with the mmio address io_addr. This
  74  *      address should have been obtained by ioremap.
  75  *      Returns 1 on a match.
  76  */
  77
  78 static inline int check_signature(const volatile void __iomem *io_addr,
  79         const unsigned char *signature, int length)
  80 {
  81         int retval = 0;
  82         do {
  83                 if (readb(io_addr) != *signature)
  84                         goto out;
  85                 io_addr++;
  86                 signature++;
  87                 length--;
  88         } while (length);
  89         retval = 1;
  90 out:
  91         return retval;
  92 }
  93
  94 #endif /* _LINUX_IO_H */