arch/sandbox/include/asm/io.h

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #ifndef __SANDBOX_ASM_IO_H
   8 #define __SANDBOX_ASM_IO_H
   9
  10 /*
  11  * Given a physical address and a length, return a virtual address
  12  * that can be used to access the memory range with the caching
  13  * properties specified by "flags".
  14  */
  15 #define MAP_NOCACHE     (0)
  16 #define MAP_WRCOMBINE   (0)
  17 #define MAP_WRBACK      (0)
  18 #define MAP_WRTHROUGH   (0)
  19
  20 void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags);
  21
  22 /*
  23  * Take down a mapping set up by map_physmem().
  24  */
  25 static inline void unmap_physmem(void *vaddr, unsigned long flags)
  26 {
  27
  28 }
  29
  30 /* For sandbox, we want addresses to point into our RAM buffer */
  31 static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
  32 {
  33         return map_physmem(paddr, len, MAP_WRBACK);
  34 }
  35
  36 static inline void unmap_sysmem(const void *vaddr)
  37 {
  38 }
  39
  40 /* Map from a pointer to our RAM buffer */
  41 phys_addr_t map_to_sysmem(const void *ptr);
  42
  43 /* Define nops for sandbox I/O access */
  44 #define readb(addr) 0
  45 #define readw(addr) 0
  46 #define readl(addr) 0
  47 #define writeb(v, addr)
  48 #define writew(v, addr)
  49 #define writel(v, addr)
  50
  51 #include <iotrace.h>
  52
  53 #endif