sys/dev/drm/include/linux/io.h

   1 /*
   2  * Copyright (c) 2014-2015 François Tigeot
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_IO_H_
  28 #define _LINUX_IO_H_
  29
  30 #include <linux/kernel.h>
  31 #include <asm/io.h>
  32 #include <asm/page.h>
  33
  34 #if defined(writel)
  35 #undef writel
  36 #endif
  37
  38 static inline void
  39 writel(uint32_t value, volatile void *addr)
  40 {
  41         *(volatile uint32_t *)addr = value;
  42 }
  43
  44 static inline int
  45 arch_phys_wc_add(unsigned long base, unsigned long size)
  46 {
  47         /* The DragonFly kernel is PAT-enabled, do nothing */
  48         return 0;
  49 }
  50
  51 static inline void
  52 arch_phys_wc_del(int handle)
  53 {
  54         BUG_ON(handle != 0);
  55 }
  56
  57 #endif  /* _LINUX_IO_H_ */