sys/dev/drm/include/asm/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 _ASM_IO_H_
  28 #define _ASM_IO_H_
  29
  30 #include <machine/pmap.h>
  31 #include <vm/vm.h>
  32
  33 #include <asm/page.h>
  34
  35 #define ioread8(addr)           *(volatile uint8_t *)((char *)addr)
  36 #define ioread16(addr)          *(volatile uint16_t *)((char *)addr)
  37 #define ioread32(addr)          *(volatile uint32_t *)((char *)addr)
  38
  39 #define iowrite8(data, addr)                                    \
  40         do {                                                    \
  41                 *(volatile uint8_t *)((char *)addr) = data;     \
  42         } while (0)
  43
  44 #define iowrite16(data, addr)                                   \
  45         do {                                                    \
  46                 *(volatile uint16_t *)((char *)addr) = data;    \
  47         } while (0)
  48
  49 #define iowrite32(data, addr)                                   \
  50         do {                                                    \
  51                 *(volatile uint32_t *)((char *)addr) = data;    \
  52         } while (0)
  53
  54 #include <linux/vmalloc.h>
  55
  56 /* ioremap function family: map bus addresses into CPU space */
  57 static inline void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size)
  58 {
  59         return pmap_mapdev_uncacheable(offset, size);
  60 }
  61
  62 static inline void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
  63 {
  64         return pmap_mapdev_attr(phys_addr, size, VM_MEMATTR_WRITE_COMBINING);
  65 }
  66
  67 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
  68 {
  69         return ioremap_nocache(offset, size);
  70 }
  71
  72 static inline void iounmap(void __iomem *ptr, unsigned long size)
  73 {
  74         pmap_unmapdev((vm_offset_t) ptr, size);
  75 }
  76
  77 #define mmiowb cpu_sfence
  78
  79 #endif  /* _ASM_IO_H_ */